From nobody Sat Jul 1 12:39:42 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF0AA129A9F for ; Sat, 1 Jul 2017 12:39:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id scqf5pA0w4Fj for ; Sat, 1 Jul 2017 12:39:40 -0700 (PDT) Received: from mail-qk0-x229.google.com (mail-qk0-x229.google.com [IPv6:2607:f8b0:400d:c09::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 47B2D126CC7 for ; Sat, 1 Jul 2017 12:39:40 -0700 (PDT) Received: by mail-qk0-x229.google.com with SMTP id 16so122952325qkg.2 for ; Sat, 01 Jul 2017 12:39:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=tqqBK2wbZAnMIB6eK9F4F5s2emP7vdpyfdbTVAM06fk=; b=Li7biQJD4ct/oRHItFkjyYx0NxJ9rVCcQ///mkMTUFqefKEwr1eBZ0QNUhBfD3i/3Z Jm8qeCgDfYsrxk+tS4srsfeY9r7WAFrSReD8VkQInkY4r8CS63b4iEzoBKItJrolAegB 1HFwWBDv+fdyJrgu+SDQJVo8O8OGJZnwSCILId5cjKavc6Ve8wajr1gXBPDqNR2lqAhX JjeFaQTrrUB1kyKUMRW6g3wgfuBuRGj5PSOC+sahHdnDfzO2gyatNpbh85xPoYY6vWrT HbIlLuTikmsEaeOiFvm06ohdtkgPgyj/np/UXGxqwR3MrQsL/eOJyAZwN1lsGE/FjqG4 ZQQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=tqqBK2wbZAnMIB6eK9F4F5s2emP7vdpyfdbTVAM06fk=; b=Bu98MyKKPkjyJsWQaunwaUmd7I4hzqiSN45/QL3mN/xMLsjG0JECDqGHGrACqSf5+I gO3kobdLqNN1V1k9HPPHsula4meYUipaPEv7wA5+J02C/f6QMNRZQdg44KVVgq2uLnuA ReW3MjYgP5jUe/joRnqIb5UVLq9cMSa7tPH7n0LZ+G7/QfuK32DfVTLCvxeb6khfXOwZ IDGws4es25/zKJzSGqh3D/NQ2w/GPhzkbRWTMPC0ZZ8mM4dYS4cC6L9UMi08rAkLHoJ7 M55DHXiw3yG+0Hwm78OUwjxntZ6WstG4vbhU9GbnntMCCiAt7qFBQMKnbbtpk100e8n0 zRoQ== X-Gm-Message-State: AKS2vOx029DNvIvY1tlBY7CTflNhnw08M3g+h20EIzpOA7vxrPvQ+2Cn /HCI6pR6WZo6ULny8mXbP1AUG+aI5Nfu X-Received: by 10.55.198.66 with SMTP id b63mr31399024qkj.224.1498937979414; Sat, 01 Jul 2017 12:39:39 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Sat, 1 Jul 2017 12:39:38 -0700 (PDT) In-Reply-To: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> From: Greg Mirsky Date: Sat, 1 Jul 2017 12:39:38 -0700 Message-ID: To: Joel Halpern Direct Cc: Adrian Farrel , sfc@ietf.org Content-Type: multipart/alternative; boundary="001a11499c04cdade6055346b1f6" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 19:39:42 -0000 --001a11499c04cdade6055346b1f6 Content-Type: text/plain; charset="UTF-8" Hi Joel, Adrian, et. al, you'd expect that I'll look into OAM bit and wording on OAM packet first. And so I had. I'm concerned that NSH refers to expired and, frankly, stalled document that had not been discussed for too long. I believe the NSH document should have or refer to clear definition of SFC OAM packet before it defines interpretation of O-bit flag. draft-farrel-sfc-convent correctly points that in current form O-bit indicates presence of OAM information which can be either as metadata or as payload. I believe that we must have more clear and deterministic definition of OAM packet as current, in my opinion, may cause problems for HW-based SFC OAM support. Regards, Greg On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct < jmh.direct@joelhalpern.com> wrote: > The -13 will be out in a few days with all the changes. > That is what we will ask the WG to review. > If we already had it out, we would have already asked for the WG to take a > last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, Greg Mirsky wrote: > >> Hi Joel, >> is the -12 the latest published version of the NSH draft? As I see, it is >> missing TTL and all related changes: >> > --001a11499c04cdade6055346b1f6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Joel, Adrian, et. al,
you'd expect that I'l= l look into OAM bit and wording on OAM packet first. And so I had. I'm = concerned that NSH refers to expired and, frankly, stalled document that ha= d not been discussed for too long. I believe the NSH document should have o= r refer to clear definition of SFC OAM packet before it defines interpretat= ion of O-bit flag.=C2=A0draft-farrel-sfc-convent correctly points that in c= urrent form O-bit indicates presence of OAM information which can be either= as metadata or as payload. I believe that we must have more clear and dete= rministic definition of OAM packet as current, in my opinion, may cause pro= blems for HW-based SFC OAM support.

Regards,
=
Greg

On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct = <jmh.dir= ect@joelhalpern.com> wrote:
The -13 will be out in a few days with all the changes.
That is what we will ask the WG to review.
If we already had it out, we would have already asked for the WG to take a = last look.

Yours,
Joel


On 6/29/17 7:21 PM, Greg Mirsky wrote:
Hi Joel,
is the -12 the latest published version of the NSH draft? As I see, it is m= issing TTL and all related changes:

--001a11499c04cdade6055346b1f6-- From nobody Sat Jul 1 12:46:44 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 11C48129A92 for ; Sat, 1 Jul 2017 12:46:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gWNagk_b_gMr for ; Sat, 1 Jul 2017 12:46:39 -0700 (PDT) Received: from mail-qk0-x22c.google.com (mail-qk0-x22c.google.com [IPv6:2607:f8b0:400d:c09::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9FF44126CC7 for ; Sat, 1 Jul 2017 12:46:39 -0700 (PDT) Received: by mail-qk0-x22c.google.com with SMTP id p21so122946889qke.3 for ; Sat, 01 Jul 2017 12:46:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=RbH8wUWWHjGVtH3z9b5Eids79X5GTxndKWhRdHbLScA=; b=ldjnUMKY9fxKcPWkuhFvJm/Pj9cNczBBysLtx+miWE3NMaSxsBJGZraofULg4RAT3a K+0KBIqKAdnT2+Ks28p4WfRlukQj+a6Pj8r+ros8ZJF2m91Yza05sIF+J+7bShHi/F1H fSNbT7meaLZZ/9X60v+bZFNIZLcQ9TF49uA7/uxbBaZfneXtnr0Z04mWR7gQGIzR2CCL 13CfKsFizJkv2hU+mw0rVS81Lff8e1ZLn85cw3LGGmOuYJww8FU8bckKhF/D4snAdZfW dQDoRJ9JHuGzfrZqvZYrJYqB11ceTBOFahGgowMRYVQbP0F+PyvWgLoTsETkQg9oFbg1 gX3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=RbH8wUWWHjGVtH3z9b5Eids79X5GTxndKWhRdHbLScA=; b=CHcJATOdC3yZMLQTQgF0gft3iPuQY/UQdL/zAQeKyYgQx4igSS0deQ+U/HuWSiPfWs NjCZHfZx5vWfI62pUAuWqIRYVE3SS+WhY9XfjevcQCTuxoGtkeSk4tI/UFRD1I1XExAw O0vaaTId5D1Oo7Koia4H0ypmZNDhZ+aqJOnc/JGvWQPkGYEch3n3DSP/Zbsv3+gFl1bQ BxFcIvMaXOOc3EHg0v9Np3fAXoEN1C8b9Jwjae7WcndZdhudM3oetsOzDmRKXNEGAwvV ut3WPNsZY8gcGOU9XKWAY9XPre9jBXSU517dyh2MItSgoFOY7dyv8DFtfHIL+CCpm+dW vU6A== X-Gm-Message-State: AKS2vOwUb9vZQ5jx/tLSov0l9Xit0mbvFP6RJipt/Hh7KAsPkq9CCi4f AzmLNDxzLm0FBOvUjA8bjBKz9UQAZA== X-Received: by 10.55.36.141 with SMTP id k13mr34022402qkk.64.1498938398603; Sat, 01 Jul 2017 12:46:38 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Sat, 1 Jul 2017 12:46:38 -0700 (PDT) In-Reply-To: <154401d2f129$3b3c81e0$b1b585a0$@olddog.co.uk> References: <154401d2f129$3b3c81e0$b1b585a0$@olddog.co.uk> From: Greg Mirsky Date: Sat, 1 Jul 2017 12:46:38 -0700 Message-ID: To: Adrian Farrel Cc: sfc@ietf.org Content-Type: multipart/alternative; boundary="001a1143219cc9ff1f055346ca1c" Archived-At: Subject: Re: [sfc] Next Protocol = "None" X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 19:46:42 -0000 --001a1143219cc9ff1f055346ca1c Content-Type: text/plain; charset="UTF-8" Hi Adrian, predictably, I'll ask about OAM section. The document states: Since OAM information will be carried in packets that also include payload data, that information must be carried in metadata. I agree, that if we want to interleave or piggy-back OAM with payload placing OAM information as metadata may be the right option in SFC. But what about active OAM, e.g. Echo Request/Reply or proactive monitoring? Should OAM be carried as metadata in these cases as well? It is possible but I'm concerned that too flexible TLV format may prove to be costly for HW-based implementation of SFC OAM. Regards, Greg On Thu, Jun 29, 2017 at 3:44 PM, Adrian Farrel wrote: > All, > > I refreshed this draft with a little polish. > > Recall, it describes how, by setting the NSH "next protocol" field to > "None" it > is possible to send an NSH packet without user data but with metadata. > > Also recall that this document contains a description of how to handle an > NSH > packet with an unknown/unsupported "next protocol" field value. > > We previously discussed whether to move some or all of this material to > the NSH > document. > The feeling that I recorded was that the description of handling unknown > next > protocols needs to be in the NSH spec, but that it might be wise to leave > the > meaning and use of "none" to a separate document to avoid delaying the NSH > spec. > I would note that the lack of rapid advancement of the NSH spec might > suggest > that we should roll all of this in together. > > Along the way, I found I needed to write text about the security > implications of > metadata and the way that metadata should be secured. In theory, this > should all > be covered in the NSH spec, but it isn't. > > Cheers, > Adrian > > > -----Original Message----- > > From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of > > internet-drafts@ietf.org > > Sent: 29 June 2017 23:28 > > To: i-d-announce@ietf.org > > Subject: I-D Action: draft-farrel-sfc-convent-02.txt > > > > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > > > > > > Title : Operating the Network Service Header (NSH) > with Next > Protocol > > "None" > > Authors : Adrian Farrel > > John Drake > > Filename : draft-farrel-sfc-convent-02.txt > > Pages : 10 > > Date : 2017-06-29 > > > > Abstract: > > This document describes the use of the Network Service Header (NSH) > > in a Service Function Chaining (SFC) enabled network with no payload > > data and carrying only metadata. This is achieved by defining a new > > NSH "Next Protocol" type value of "None". > > > > This document illustrates some of the functions that may be achieved > > or enhanced by this mechanism, but it does not provide an exhaustive > > list of use cases, nor is it intended to be definitive about the > > functions it describes. It is expected that other documents will > > describe specific use cases in more detail and will define the > > protocol mechanics for each use case. > > > > > > > > The IETF datatracker status page for this draft is: > > https://datatracker.ietf.org/doc/draft-farrel-sfc-convent/ > > > > There are also htmlized versions available at: > > https://tools.ietf.org/html/draft-farrel-sfc-convent-02 > > https://datatracker.ietf.org/doc/html/draft-farrel-sfc-convent-02 > > > > A diff from the previous version is available at: > > https://www.ietf.org/rfcdiff?url2=draft-farrel-sfc-convent-02 > > > > > > Please note that it may take a couple of minutes from the time of > submission > > until the htmlized version and diff are available at tools.ietf.org. > > > > Internet-Drafts are also available by anonymous FTP at: > > ftp://ftp.ietf.org/internet-drafts/ > > > > _______________________________________________ > > I-D-Announce mailing list > > I-D-Announce@ietf.org > > https://www.ietf.org/mailman/listinfo/i-d-announce > > Internet-Draft directories: http://www.ietf.org/shadow.html > > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --001a1143219cc9ff1f055346ca1c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Adrian,
predictably, I'll ask about OAM section= .
The document states:
   Since OAM information will be carried in packets that also include
   payload data, that information must be carried in metadata.
I agree, that if we want=
 to interleave or piggy-back OAM with payload placing OAM information as me=
tadata may be the right option in SFC. 
But what about active OAM, e.g. Echo Req=
uest/Reply or proactive monitoring? Should OAM be carried as metadata in th=
ese cases as well?
It is possible but I'm concerned that too flexible TLV fo=
rmat may prove to be costly for HW-based implementation of SFC OAM.<=
/pre>

<=
/pre>
Regards,
Greg

On Thu, Jun 29, 2017 at 3:44 PM, Adrian Farrel <adrian@olddog.co.uk<= /a>> wrote:
All,

I refreshed this draft with a little polish.

Recall, it describes how, by setting the NSH "next protocol" fiel= d to "None" it
is possible to send an NSH packet without user data but with metadata.

Also recall that this document contains a description of how to handle an N= SH
packet with an unknown/unsupported "next protocol" field value.
We previously discussed whether to move some or all of this material to the= NSH
document.
The feeling that I recorded was that the description of handling unknown ne= xt
protocols needs to be in the NSH spec, but that it might be wise to leave t= he
meaning and use of "none" to a separate document to avoid delayin= g the NSH spec.
I would note that the lack of rapid advancement of the NSH spec might sugge= st
that we should roll all of this in together.

Along the way, I found I needed to write text about the security implicatio= ns of
metadata and the way that metadata should be secured. In theory, this shoul= d all
be covered in the NSH spec, but it isn't.

Cheers,
Adrian

> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: 29 June 2017 23:28
> To: i-d-announce@ietf.org=
> Subject: I-D Action: draft-farrel-sfc-convent-02.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0: Operating the Network Service Header (NSH) with Next
Protocol
> "None"
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0: Adrian Farrel
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0John Drake
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-= farrel-sfc-convent-02.txt
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0: 10
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 : 2017-06-29
>
> Abstract:
>=C2=A0 =C2=A0 This document describes the use of the Network Service He= ader (NSH)
>=C2=A0 =C2=A0 in a Service Function Chaining (SFC) enabled network with= no payload
>=C2=A0 =C2=A0 data and carrying only metadata.=C2=A0 This is achieved b= y defining a new
>=C2=A0 =C2=A0 NSH "Next Protocol" type value of "None&qu= ot;.
>
>=C2=A0 =C2=A0 This document illustrates some of the functions that may = be achieved
>=C2=A0 =C2=A0 or enhanced by this mechanism, but it does not provide an= exhaustive
>=C2=A0 =C2=A0 list of use cases, nor is it intended to be definitive ab= out the
>=C2=A0 =C2=A0 functions it describes.=C2=A0 It is expected that other d= ocuments will
>=C2=A0 =C2=A0 describe specific use cases in more detail and will defin= e the
>=C2=A0 =C2=A0 protocol mechanics for each use case.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc= /draft-farrel-sfc-convent/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-f= arrel-sfc-convent-02
> https://datatracker.ietf.org/<= wbr>doc/html/draft-farrel-sfc-convent-02
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-farrel-sfc-convent-02
>
>
> Please note that it may take a couple of minutes from the time of subm= ission
> until the htmlized version and diff are available at tools.ietf.org. >
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-= d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html=
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt<= br>
_______________________________________________
sfc mailing list
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--001a1143219cc9ff1f055346ca1c-- From nobody Sat Jul 1 13:21:46 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 02372129ADC for ; Sat, 1 Jul 2017 13:21:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PlqfcD6ubiM5 for ; Sat, 1 Jul 2017 13:21:43 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4E9B9129AD3 for ; Sat, 1 Jul 2017 13:21:43 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id 35D634039DF; Sat, 1 Jul 2017 13:21:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1498940503; bh=FABkrL4is8YITnb0IniwJWggUrJN6pPO7jNCJ7mWXK4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=OPooW6Cd8CayCC9OqgQE0SAY01pPstzH+VM9Le8U7cbzm4Ou26PMrpJYfk+Hnyy4J u6o/L1PEYeJqJ49Hh7VBDE4POHXEpMiivu4UItL3KKnTfTXD6UMdh76gFvxCeOo55L /KWVXs8vh68yRdW9plnlkRllQyJL21dMQOdFGh+4= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id A82F01C0049; Sat, 1 Jul 2017 13:21:42 -0700 (PDT) To: Greg Mirsky Cc: sfc@ietf.org References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> From: "Joel M. Halpern" Message-ID: <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> Date: Sat, 1 Jul 2017 16:21:41 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 20:21:45 -0000 Greg, the editors are working on the revision of the OAM Framework document. More importantly, we have been careful that the NSH document does not normatively depend upon the OAM specification. This was discussed with the working group several times, and the OAM wording in -13 is the result of that discussion. Are you really asking that we hold up RFC publication of the NSH document until we have agreement on all of the complex OAM issues (such as in-situ, etc.) I observe a steady rate of new OAM proposals, with new behaviors. That seems to indicate that such ahold-up would be almost indefinite. Yours, Joel M. Halpern On 7/1/17 3:39 PM, Greg Mirsky wrote: > Hi Joel, Adrian, et. al, > you'd expect that I'll look into OAM bit and wording on OAM packet > first. And so I had. I'm concerned that NSH refers to expired and, > frankly, stalled document that had not been discussed for too long. I > believe the NSH document should have or refer to clear definition of SFC > OAM packet before it defines interpretation of O-bit > flag. draft-farrel-sfc-convent correctly points that in current form > O-bit indicates presence of OAM information which can be either as > metadata or as payload. I believe that we must have more clear and > deterministic definition of OAM packet as current, in my opinion, may > cause problems for HW-based SFC OAM support. > > Regards, > Greg > > On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct > > wrote: > > The -13 will be out in a few days with all the changes. > That is what we will ask the WG to review. > If we already had it out, we would have already asked for the WG to > take a last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, Greg Mirsky wrote: > > Hi Joel, > is the -12 the latest published version of the NSH draft? As I > see, it is missing TTL and all related changes: > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Sat Jul 1 14:02:36 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B827D127076 for ; Sat, 1 Jul 2017 14:02:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wvgsJKDW-Kle for ; Sat, 1 Jul 2017 14:02:32 -0700 (PDT) Received: from mail-qt0-x22a.google.com (mail-qt0-x22a.google.com [IPv6:2607:f8b0:400d:c0d::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 306ED124D6C for ; Sat, 1 Jul 2017 14:02:32 -0700 (PDT) Received: by mail-qt0-x22a.google.com with SMTP id i2so121311655qta.3 for ; Sat, 01 Jul 2017 14:02:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=hd4H4pDYxXSBkC5AlM67EG98Gtl2JV3qVnFLBTkKESk=; b=uOloFr48qEye+l1qOIGGWSq0KXu9DRE7Pz28jsxGxrHOTpSUmfza+fFsSts0uaWnik fe/4cOxr2GBo5NnJyVRfKmoPRvF0qXBm7j0qFNU5+WJLBD5U1Bkd/5Byu+I5dEHt95HJ TokVZWbclYhi25JH6hLAX13xDCU6na1dn/7ocBOme8IMhD/cWQCwe0Fj5B8ZS2FR41kC Y2G5r+Vs+w85i3cFKOljzuHrH6v03dK5oZX4gYpA9LcHO7rmdbSb7gw4AgfqIQ/X9fLF 6gpZ4K6QlVNZdmLDjdyhk7dBHeqh0wHLrQjd1y7/VjgaaXBbmY4/VE5+r21qVhBZP84Q DUmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=hd4H4pDYxXSBkC5AlM67EG98Gtl2JV3qVnFLBTkKESk=; b=iEUlcKZtw5urcIBEE5Y7WxjP39V21F+BrLhmukloMIkxXcL/sN0Bat2i+WZINlSith Yvcmz4lLKmXwSEgWnYIXi4WwRImQhUsnUG3Y1yyq/nVHXm4qjz8j0doMkIlP7vhxsP8V mfK3Z+eqnXE1aPleQPHDVUwClhDRsLYEdjfiK9fk4xOMykjeeI3tpB0DQD42hd01mxYF +HXquxtQoixSfhlQsSBm9DWO80mqEwBiRwNWjkVz48K/+lcG/woE7FzSg04KJ0lPTM1C JzsZJbyfWzS/LVUcRuYpObTG1Fq1BCd9Px/dbBDIyUXEWMrHUwbjbWKYLjhUjK2I4/Ui azCg== X-Gm-Message-State: AKS2vOzEJO2D/aw5PzjIY9oEz6UM5Bb4qYM2zq1xB5NnoPkfSlwb/XYz 51W2ODojBoWacf3EHqlVoTjR0Ie1CA== X-Received: by 10.237.38.131 with SMTP id q3mr33668971qtd.132.1498942951229; Sat, 01 Jul 2017 14:02:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Sat, 1 Jul 2017 14:02:30 -0700 (PDT) In-Reply-To: <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> From: Greg Mirsky Date: Sat, 1 Jul 2017 14:02:30 -0700 Message-ID: To: "Joel M. Halpern" Cc: sfc@ietf.org Content-Type: multipart/alternative; boundary="94eb2c055b32258bdb055347dacb" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 21:02:35 -0000 --94eb2c055b32258bdb055347dacb Content-Type: text/plain; charset="UTF-8" Hi Joel, by all means, I'm not asking to hold NSH document until SFC OAM solutions progress. But NSH refers to OAM packet and, in my view, it is too ambiguous term. Please consider, OAM packet may be: - control message of active SFC OAM protocol carried as payload; - control message of active SFC OAM protocol carried as metadata; - control information and/or measurement results of hybrid SFC OAM protocol carried as metadata If work on OAM framework is progressing, perhaps all the OAM related discussion as well as allocation of the O-bit itself can be moved there. As co-author of several SFC OAM drafts I'd note that none of them has dependency on where OAM information must be placed, metadata or payload. But clear and unambiguous definitionsof OAM packet and interpretation of O-bit are very much needed and will help to progress SFC OAM solutions. Regards, Greg On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern wrote: > Greg, the editors are working on the revision of the OAM Framework > document. > > > More importantly, we have been careful that the NSH document does not > normatively depend upon the OAM specification. This was discussed with the > working group several times, and the OAM wording in -13 is the result of > that discussion. > > > Are you really asking that we hold up RFC publication of the NSH document > until we have agreement on all of the complex OAM issues (such as in-situ, > etc.) I observe a steady rate of new OAM proposals, with new behaviors. > That seems to indicate that such ahold-up would be almost indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky wrote: > >> Hi Joel, Adrian, et. al, >> you'd expect that I'll look into OAM bit and wording on OAM packet first. >> And so I had. I'm concerned that NSH refers to expired and, frankly, >> stalled document that had not been discussed for too long. I believe the >> NSH document should have or refer to clear definition of SFC OAM packet >> before it defines interpretation of O-bit flag. draft-farrel-sfc-convent >> correctly points that in current form O-bit indicates presence of OAM >> information which can be either as metadata or as payload. I believe that >> we must have more clear and deterministic definition of OAM packet as >> current, in my opinion, may cause problems for HW-based SFC OAM support. >> >> Regards, >> Greg >> >> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct < >> jmh.direct@joelhalpern.com > wrote: >> >> The -13 will be out in a few days with all the changes. >> That is what we will ask the WG to review. >> If we already had it out, we would have already asked for the WG to >> take a last look. >> >> Yours, >> Joel >> >> >> On 6/29/17 7:21 PM, Greg Mirsky wrote: >> >> Hi Joel, >> is the -12 the latest published version of the NSH draft? As I >> see, it is missing TTL and all related changes: >> >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> --94eb2c055b32258bdb055347dacb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Joel,
by all means, I'm not asking to hold NSH = document until SFC OAM solutions progress. But NSH refers to OAM packet and= , in my view, it is too ambiguous term. Please consider, OAM packet may be:=
  • control message of active SFC OAM protocol carried as pa= yload;
  • control message of active SFC OAM protocol carried as me= tadata;
  • control information and/or measurement results of hybrid SF= C OAM protocol carried as metadata
If work on OAM framework i= s progressing, perhaps all the OAM related discussion as well as allocation= of the O-bit itself can be moved there.

As = co-author of several SFC OAM drafts I'd note that none of them has depe= ndency on where OAM information must be placed, metadata or payload. But cl= ear and unambiguous definitionsof OAM packet and interpretation of O-bit ar= e very much needed and will help to progress SFC OAM solutions.
<= br>
Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Hal= pern <jmh@joelhalpern.com> wrote:
Greg, the editors are working on the revision of the OAM Framewor= k document.

<chair hat on>
More importantly, we have been careful that the NSH document does not norma= tively depend upon the OAM specification.=C2=A0 This was discussed with the= working group several times, and the OAM wording in -13 is the result of t= hat discussion.
</chair hat on>
<chair hat off>
Are you really asking that we hold up RFC publication of the NSH document u= ntil we have agreement on all of the complex OAM issues (such as in-situ, e= tc.)=C2=A0 I observe a steady rate of new OAM proposals, with new behaviors= .=C2=A0 That seems to indicate that such ahold-up would be almost indefinit= e.
</chair hat off>

Yours,
Joel M. Halpern

On 7/1/17 3:39 PM, Greg Mirsky wrote:
Hi Joel, Adrian, et. al,
you'd expect that I'll look into OAM bit and wording on OAM packet = first. And so I had. I'm concerned that NSH refers to expired and, fran= kly, stalled document that had not been discussed for too long. I believe t= he NSH document should have or refer to clear definition of SFC OAM packet = before it defines interpretation of O-bit flag. draft-farrel-sfc-convent co= rrectly points that in current form O-bit indicates presence of OAM informa= tion which can be either as metadata or as payload. I believe that we must = have more clear and deterministic definition of OAM packet as current, in m= y opinion, may cause problems for HW-based SFC OAM support.

Regards,
Greg

 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern.com>> wrote:

=C2=A0 =C2=A0 The -13 will be out in a few days with all the changes.
=C2=A0 =C2=A0 That is what we will ask the WG to review.
=C2=A0 =C2=A0 If we already had it out, we would have already asked for the= WG to
=C2=A0 =C2=A0 take a last look.

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel


=C2=A0 =C2=A0 On 6/29/17 7:21 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 is the -12 the latest published version of the = NSH draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 see, it is missing TTL and all related changes:=




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--94eb2c055b32258bdb055347dacb-- From nobody Sat Jul 1 14:02:51 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3C9F7129AE8 for ; Sat, 1 Jul 2017 14:02:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vxIEi7ZCBxEm for ; Sat, 1 Jul 2017 14:02:40 -0700 (PDT) Received: from mail-oi0-x235.google.com (mail-oi0-x235.google.com [IPv6:2607:f8b0:4003:c06::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CAE54129B00 for ; Sat, 1 Jul 2017 14:02:39 -0700 (PDT) Received: by mail-oi0-x235.google.com with SMTP id 191so33628689oii.2 for ; Sat, 01 Jul 2017 14:02:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Lz3yaqvYELE82Cq3jJQX9uI7ziSCLJutUm2vA3Q92cU=; b=t1a3KjozZqIxQr179As1GR25ZZTtpIRjSWMH0HVhnWx/Ft1vqZF2Z1BYBG6RIF/dVf hYv5UKwvW7vQDY8bzDm19T7gBarRH3a1vnEaRKewZ58zMcki8bhwgBFZGs+GowAdX6hP bPVWgACDPJHhcpYUWfiT7mg32cq2QkiP7CRDGTZ0bvNtCgHpTKEev0DzTtAArOpFIuqL F2/UQyAMRnnUe2V1FX7onSfcVzcdN4YWpeX73+U4Ipkw3+VPEAl7WjEh0Q/FFro74r6E 0/qhWLUfvig9Qj9rbHotXrKVBUZs7yHMgFhP5Q1VqAoAu8KTJjnZXBzMJovYwmU7IuFv cu3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=Lz3yaqvYELE82Cq3jJQX9uI7ziSCLJutUm2vA3Q92cU=; b=pIqZtyCXtQ/gWMxRfWZGpbH/RdLZrIbHBatBrhLnxMhNG8wEdfJiugqCzxTeXLcXnV gFD8e1ELhNolVISXLJZAbKmle0ZChVn4NlFx8LaPdle2/6xhPZRcqiNOHwxuWBzx2nMy vsG7n84FsVy5Yko493xut3ZNk0wA/1k2V8YHkBGJhJwF91YACKPaATBQsFKaq70GkFLe URo4VP8XOk2sGrnok0klJtBz/2ivW7XxQDutyQ40KaW6WTe2k0I6vSYxO0PjcFfze1dz S6Wn2CP8xKbj9m+5GFof1wARiUJ8yBkq57Gfw9s32avy8FQUaDRiH1e+ABeR1MGdLydZ G3Ag== X-Gm-Message-State: AKS2vOzhzIxfvaaUj37QzagX39z8dj1T6Xi70auXSk1rFvTOimlYZcZE jVh2w1G0BqnVmIOxB0/+3vUFbU0ejA== X-Received: by 10.202.177.5 with SMTP id a5mr17577015oif.172.1498942959147; Sat, 01 Jul 2017 14:02:39 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.16.102 with HTTP; Sat, 1 Jul 2017 14:02:18 -0700 (PDT) In-Reply-To: <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> From: "Andrew G. Malis" Date: Sat, 1 Jul 2017 17:02:18 -0400 Message-ID: To: "Joel M. Halpern" Cc: Greg Mirsky , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a113cd4e89e60a5055347dafa" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 21:02:42 -0000 --001a113cd4e89e60a5055347dafa Content-Type: text/plain; charset="UTF-8" Joel and Greg, I for one am looking forward to seeing what -13 says about this as well as other things that have been discussed on the list. Regard the O-bit flag, -13 should have clear wording on what an implementation should do with the bit at this time (on both sending and receiving) given that we expect its publication prior to any publication of OAM-related RFCs. It can always be updated by a future OAM RFC. Cheers, Andy On Sat, Jul 1, 2017 at 4:21 PM, Joel M. Halpern wrote: > Greg, the editors are working on the revision of the OAM Framework > document. > > > More importantly, we have been careful that the NSH document does not > normatively depend upon the OAM specification. This was discussed with the > working group several times, and the OAM wording in -13 is the result of > that discussion. > > > Are you really asking that we hold up RFC publication of the NSH document > until we have agreement on all of the complex OAM issues (such as in-situ, > etc.) I observe a steady rate of new OAM proposals, with new behaviors. > That seems to indicate that such ahold-up would be almost indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky wrote: > >> Hi Joel, Adrian, et. al, >> you'd expect that I'll look into OAM bit and wording on OAM packet first. >> And so I had. I'm concerned that NSH refers to expired and, frankly, >> stalled document that had not been discussed for too long. I believe the >> NSH document should have or refer to clear definition of SFC OAM packet >> before it defines interpretation of O-bit flag. draft-farrel-sfc-convent >> correctly points that in current form O-bit indicates presence of OAM >> information which can be either as metadata or as payload. I believe that >> we must have more clear and deterministic definition of OAM packet as >> current, in my opinion, may cause problems for HW-based SFC OAM support. >> >> Regards, >> Greg >> >> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct < >> jmh.direct@joelhalpern.com > wrote: >> >> The -13 will be out in a few days with all the changes. >> That is what we will ask the WG to review. >> If we already had it out, we would have already asked for the WG to >> take a last look. >> >> Yours, >> Joel >> >> >> On 6/29/17 7:21 PM, Greg Mirsky wrote: >> >> Hi Joel, >> is the -12 the latest published version of the NSH draft? As I >> see, it is missing TTL and all related changes: >> >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --001a113cd4e89e60a5055347dafa Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Joel and Greg,

I for one am looking for= ward to seeing what -13 says about this as well as other things that have b= een discussed on the list. Regard the O-bit flag, -13 should have clear wor= ding on what an implementation should do with the bit at this time (on both= sending and receiving) given that we expect its publication prior to any p= ublication of OAM-related RFCs. It can always be updated by a future OAM RF= C.

Cheers,
Andy


On Sat, Jul 1, = 2017 at 4:21 PM, Joel M. Halpern <jmh@joelhalpern.com> wro= te:
Greg, the editors are working on the = revision of the OAM Framework document.

<chair hat on>
More importantly, we have been careful that the NSH document does not norma= tively depend upon the OAM specification.=C2=A0 This was discussed with the= working group several times, and the OAM wording in -13 is the result of t= hat discussion.
</chair hat on>
<chair hat off>
Are you really asking that we hold up RFC publication of the NSH document u= ntil we have agreement on all of the complex OAM issues (such as in-situ, e= tc.)=C2=A0 I observe a steady rate of new OAM proposals, with new behaviors= .=C2=A0 That seems to indicate that such ahold-up would be almost indefinit= e.
</chair hat off>

Yours,
Joel M. Halpern

On 7/1/17 3:39 PM, Greg Mirsky wrote:
Hi Joel, Adrian, et. al,
you'd expect that I'll look into OAM bit and wording on OAM packet = first. And so I had. I'm concerned that NSH refers to expired and, fran= kly, stalled document that had not been discussed for too long. I believe t= he NSH document should have or refer to clear definition of SFC OAM packet = before it defines interpretation of O-bit flag. draft-farrel-sfc-convent co= rrectly points that in current form O-bit indicates presence of OAM informa= tion which can be either as metadata or as payload. I believe that we must = have more clear and deterministic definition of OAM packet as current, in m= y opinion, may cause problems for HW-based SFC OAM support.

Regards,
Greg

 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern.com>> wrote:

=C2=A0 =C2=A0 The -13 will be out in a few days with all the changes.
=C2=A0 =C2=A0 That is what we will ask the WG to review.
=C2=A0 =C2=A0 If we already had it out, we would have already asked for the= WG to
=C2=A0 =C2=A0 take a last look.

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel


=C2=A0 =C2=A0 On 6/29/17 7:21 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 is the -12 the latest published version of the = NSH draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 see, it is missing TTL and all related changes:=




_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc


_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

--001a113cd4e89e60a5055347dafa-- From nobody Sat Jul 1 14:11:54 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A36F6129461 for ; Sat, 1 Jul 2017 14:11:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ip6qtVnWohUP for ; Sat, 1 Jul 2017 14:11:40 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D3293129AF1 for ; Sat, 1 Jul 2017 14:11:40 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id BC96C403BB2; Sat, 1 Jul 2017 14:11:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1498943500; bh=dm+9lULISxeYKkWns6p1UQjmerRW2U8ZAcmw7HL1rZo=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=TmbkAeoG4PWoSqGIvvBX+Ppk3P0pYdyqkofc4ihquV9ywPYGW4rcQqL5ZnmM/S4pd nbT2UghRk/7Q/SEJLXa4BdBE1lIti6yvbRhBBS0YJRBzCPJRzM+HW+OMuZy4yIr72D HHt4c3lRyBiLgD/CW+8GYg0GJmqz76Yww/Gycfgo= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 354801C0076; Sat, 1 Jul 2017 14:11:40 -0700 (PDT) To: Greg Mirsky Cc: sfc@ietf.org References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> From: "Joel M. Halpern" Message-ID: <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> Date: Sat, 1 Jul 2017 17:11:39 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 21:11:46 -0000 The definition of the O bit in the document is: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O-bit MUST NOT be modified along the SFP. This seems to me a VERY clear description of when the bit is to be set, and what handling is required when packets with this bit are received at an NSH support entity. If you consider this wording unclear, please propose specific text to improve it. Yours, Joel On 7/1/17 5:02 PM, Greg Mirsky wrote: > Hi Joel, > by all means, I'm not asking to hold NSH document until SFC OAM > solutions progress. But NSH refers to OAM packet and, in my view, it is > too ambiguous term. Please consider, OAM packet may be: > > * control message of active SFC OAM protocol carried as payload; > * control message of active SFC OAM protocol carried as metadata; > * control information and/or measurement results of hybrid SFC OAM > protocol carried as metadata > > If work on OAM framework is progressing, perhaps all the OAM related > discussion as well as allocation of the O-bit itself can be moved there. > > As co-author of several SFC OAM drafts I'd note that none of them has > dependency on where OAM information must be placed, metadata or payload. > But clear and unambiguous definitionsof OAM packet and interpretation of > O-bit are very much needed and will help to progress SFC OAM solutions. > > Regards, > Greg > > On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern > wrote: > > Greg, the editors are working on the revision of the OAM Framework > document. > > > More importantly, we have been careful that the NSH document does > not normatively depend upon the OAM specification. This was > discussed with the working group several times, and the OAM wording > in -13 is the result of that discussion. > > > Are you really asking that we hold up RFC publication of the NSH > document until we have agreement on all of the complex OAM issues > (such as in-situ, etc.) I observe a steady rate of new OAM > proposals, with new behaviors. That seems to indicate that such > ahold-up would be almost indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky wrote: > > Hi Joel, Adrian, et. al, > you'd expect that I'll look into OAM bit and wording on OAM > packet first. And so I had. I'm concerned that NSH refers to > expired and, frankly, stalled document that had not been > discussed for too long. I believe the NSH document should have > or refer to clear definition of SFC OAM packet before it defines > interpretation of O-bit flag. draft-farrel-sfc-convent correctly > points that in current form O-bit indicates presence of OAM > information which can be either as metadata or as payload. I > believe that we must have more clear and deterministic > definition of OAM packet as current, in my opinion, may cause > problems for HW-based SFC OAM support. > > Regards, > Greg > > On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct > > >> wrote: > > The -13 will be out in a few days with all the changes. > That is what we will ask the WG to review. > If we already had it out, we would have already asked for > the WG to > take a last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, Greg Mirsky wrote: > > Hi Joel, > is the -12 the latest published version of the NSH > draft? As I > see, it is missing TTL and all related changes: > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > From nobody Sat Jul 1 14:27:24 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 01B861243F6 for ; Sat, 1 Jul 2017 14:27:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lU_rNKezfMLp for ; Sat, 1 Jul 2017 14:27:19 -0700 (PDT) Received: from mail-oi0-x235.google.com (mail-oi0-x235.google.com [IPv6:2607:f8b0:4003:c06::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AA2991200FC for ; Sat, 1 Jul 2017 14:27:19 -0700 (PDT) Received: by mail-oi0-x235.google.com with SMTP id l130so60466542oib.1 for ; Sat, 01 Jul 2017 14:27:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=JNadis0xFeRsjS/BZINcThdtlptKtnVDjFLyeCNNbp8=; b=vKumQuEwpr27PPrX1kJRGg+TgIzicg/ovF8fB1a8CFrYL54axTEtms4b685DiPoW+D l+Wi+0F7rT99x1UvJfKi6uCzLxJFB1TqVPt/E1wy/4n9jDFcw+WG5bKLu5ldGbgYMGV2 Jnh9AVMmmCEcRoLAtQT0tU9HHrLea7T5NV1XqR76OkW4gkvbnl/MZzCKBAU8ScTTeMpj XnfX05JTH50eolwlLidRaNw+Ku9H4VzYDsYakYYX6dldi1EJB/zvCqmYNG/1UMuQzm0v iQhQoRbMvhQGFzdMYJrC+gX29jXeUIvoYtL5sdfuhDtXI7RskMOomwG7uc99XDAc2/tl GBVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=JNadis0xFeRsjS/BZINcThdtlptKtnVDjFLyeCNNbp8=; b=PP00JBXGK8SE/Jw+JOmAIcK5XuAASjxxhGhfLknmiMhS6M6EzL1K+HRFn5G2lymBaK Zk/KHWhJRWRAdT/Pp5WpdEfOAhWBOimO+kW2NxXURsUl7vraCJ3sxOjiiX3E0a67/VGW IJhx/zqdX1QWJ685rqfmmzcE1hWebDnwS5Ld4hZrTnJUqFFe75wQZyUvKObsEOwW7Xr8 4z3E/hAxK7ybHfEefrrCTbXoBXUjhI4CDbm1mtSWO7KGsEL+ElvxCUNOJEDPrPdQS5e7 AB+gdl/JOF6cPlT3cLaUnwelM8rmfifnI6xCcR6OzvLhh04kjbMgI1UwmerK4POQy9Pp viEA== X-Gm-Message-State: AKS2vOy+JzHIw5mFZDl5tcEiJ6JtswqMDNjulj3w15dMSp3oXe4EnDYw PUYsSeDee+0TQfF65HfFaqKTNmpIxw== X-Received: by 10.202.177.5 with SMTP id a5mr17620859oif.172.1498944439095; Sat, 01 Jul 2017 14:27:19 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.16.102 with HTTP; Sat, 1 Jul 2017 14:26:58 -0700 (PDT) In-Reply-To: <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> From: "Andrew G. Malis" Date: Sat, 1 Jul 2017 17:26:58 -0400 Message-ID: To: "Joel M. Halpern" Cc: Greg Mirsky , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a113cd4e8d498e805534832c1" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 21:27:23 -0000 --001a113cd4e8d498e805534832c1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Joel, I would like to suggest changing: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). to: O bit: Setting this bit indicates the presence of Operations, Administration, and Maintenance (OAM) information. The actual OAM information format and processing is outside the scope of this specification (see [oam-frame]). The reason for this change is that we don=E2=80=99t yet know if the format = of OAM information, and whether it will be in metadata, packet contents, or both. Thus, we don=E2=80=99t yet even know if there will be =E2=80=9COAM pa= ckets=E2=80=9D per se, as data packets could possibly also carry OAM information in the metadata. If this change is acceptable, then the following two paragraphs should also be amended to: SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O bit set, but MAY support a configurable parameter to enable forwarding received packets with the O bit set unmodified to the next element in the chain. Forwarding packets with the O bit set unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding a packet with the O bit set for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O bit MUST be set for packets containing OAM information and MUST NOT be set for packets without OAM information. The O bit MUST NOT be modified along the SFP. Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D = used in the document. The document should choose one. Thanks, Andy On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern wrote= : > The definition of the O bit in the document is: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O-bit set, but MAY support > a configurable parameter to enable forwarding received SFC OAM > packets unmodified to the next element in the chain. Forwarding OAM > packets unmodified by SFC elements that do not support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding an OAM packet for all OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > This seems to me a VERY clear description of when the bit is to be set, > and what handling is required when packets with this bit are received at = an > NSH support entity. > > If you consider this wording unclear, please propose specific text to > improve it. > > Yours, > Joel > > On 7/1/17 5:02 PM, Greg Mirsky wrote: > >> Hi Joel, >> by all means, I'm not asking to hold NSH document until SFC OAM solution= s >> progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous >> term. Please consider, OAM packet may be: >> >> * control message of active SFC OAM protocol carried as payload; >> * control message of active SFC OAM protocol carried as metadata; >> * control information and/or measurement results of hybrid SFC OAM >> protocol carried as metadata >> >> If work on OAM framework is progressing, perhaps all the OAM related >> discussion as well as allocation of the O-bit itself can be moved there. >> >> As co-author of several SFC OAM drafts I'd note that none of them has >> dependency on where OAM information must be placed, metadata or payload. >> But clear and unambiguous definitionsof OAM packet and interpretation of >> O-bit are very much needed and will help to progress SFC OAM solutions. >> >> Regards, >> Greg >> >> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern > > wrote: >> >> Greg, the editors are working on the revision of the OAM Framework >> document. >> >> >> More importantly, we have been careful that the NSH document does >> not normatively depend upon the OAM specification. This was >> discussed with the working group several times, and the OAM wording >> in -13 is the result of that discussion. >> >> >> Are you really asking that we hold up RFC publication of the NSH >> document until we have agreement on all of the complex OAM issues >> (such as in-situ, etc.) I observe a steady rate of new OAM >> proposals, with new behaviors. That seems to indicate that such >> ahold-up would be almost indefinite. >> >> >> Yours, >> Joel M. Halpern >> >> On 7/1/17 3:39 PM, Greg Mirsky wrote: >> >> Hi Joel, Adrian, et. al, >> you'd expect that I'll look into OAM bit and wording on OAM >> packet first. And so I had. I'm concerned that NSH refers to >> expired and, frankly, stalled document that had not been >> discussed for too long. I believe the NSH document should have >> or refer to clear definition of SFC OAM packet before it defines >> interpretation of O-bit flag. draft-farrel-sfc-convent correctly >> points that in current form O-bit indicates presence of OAM >> information which can be either as metadata or as payload. I >> believe that we must have more clear and deterministic >> definition of OAM packet as current, in my opinion, may cause >> problems for HW-based SFC OAM support. >> >> Regards, >> Greg >> >> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct >> >> > >> wrote: >> >> The -13 will be out in a few days with all the changes. >> That is what we will ask the WG to review. >> If we already had it out, we would have already asked for >> the WG to >> take a last look. >> >> Yours, >> Joel >> >> >> On 6/29/17 7:21 PM, Greg Mirsky wrote: >> >> Hi Joel, >> is the -12 the latest published version of the NSH >> draft? As I >> see, it is missing TTL and all related changes: >> >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> >> >> > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --001a113cd4e8d498e805534832c1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Joel,

I would like to suggest changing:=

O = bit: Setting this bit indicates an Operations, Administration, and=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual pack= et format and processing of
=C2=A0 =C2=A0SFC=C2=A0OAM messages is outside t= he scope of this specification (see
=C2=A0 =C2=A0[oa= m-frame]).

to:

O bit: Setting this bit indicates the presence of= Operations, Administration, and
=C2=A0 =C2=A0Mainte= nance (OAM) information.=C2=A0 The actual OAM information format and proces= sing
=C2=A0= =C2=A0is outside the scope of this specification (see=C2=A0 [oam-frame]).


The reason for this change is that we don=E2=80=99t yet know if the format= of OAM information, and whether it will be in metadata, packet contents, o= r both.=C2=A0Thus, we don=E2=80=99t yet even know if=C2=A0there will be=C2= =A0=E2=80=9COAM packets=E2=80=9D per se, as data packets=C2=A0could possibl= y also carry OAM=C2=A0information in the metadata.

If=C2=A0this change is acceptable, th= en the following two paragraphs should also be amended to:

=C2=A0 =C2=A0SF/SFF/SFC=C2=A0Proxy/Classifer implementat= ions that do not support=C2=A0SFC
=C2=A0 =C2=A0OAM pro= cedures SHOULD discard packets with O bit set, but MAY support
=C2=A0 =C2=A0a configurable parameter to enable forwarding recei= ved packets with the O bit
=C2=A0 =C2=A0set unmodified to the next element in the chai= n.=C2=A0 Forwarding
=C2=A0 =C2=A0packets with the O = bit set unmodified by=C2=A0SFC=C2=A0elements that do not support=C2=A0SFC=C2=A0OAM
=C2=A0 =C2=A0pr= ocedures may be acceptable for a subset of OAM functions, but can=C2=A0 =C2=A0result in unexpected outcomes for others, thus i= t is recommended to
=C2=A0 =C2=A0analyze the impact = of forwarding a packet with the O bit set for all OAM functions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configu= rable parameter MUST be
= =C2=A0 =C2=A0disabled by def= ault.

= =C2=A0 =C2=A0The O bit MUST be set for packets containing OAM information a= nd MUST NOT be set for=C2=A0
=C2=A0 =C2=A0packets wi= thout OAM information.=C2=A0 The O bit MUST NOT be modified along the SFP.<= /span>


Finally, I=E2=80=99ve seen bot= h=C2=A0=E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D used in the document.=C2= =A0The document should choose one.

Thanks,
Andy


On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern <jmh@j= oelhalpern.com> wrote:
The = definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC OAM messages is outside the scope of this specification (s= ee
=C2=A0 =C2=A0[oam-frame]).

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O-bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received SFC OAM=
=C2=A0 =C2=A0packets unmodified to the next element in the chain.=C2=A0 For= warding OAM
=C2=A0 =C2=A0packets unmodified by SFC elements that do not support SFC OAM=
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding an OAM packet for all OAM fun= ctions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:
Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutio= ns progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous term. Please consider, OAM packet may be:

 =C2=A0 * control message of active SFC OAM protocol carried as payload;
=C2=A0 * control message of active SFC OAM protocol carried as metadata; =C2=A0 * control information and/or measurement results of hybrid SFC OAM
=C2=A0 =C2=A0 protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has d= ependency on where OAM information must be placed, metadata or payload. But= clear and unambiguous definitionsof OAM packet and interpretation of O-bit= are very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com&= gt;> wrote:

=C2=A0 =C2=A0 Greg, the editors are working on the revision of the OAM Fram= ework
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 More importantly, we have been careful that the NSH document = does
=C2=A0 =C2=A0 not normatively depend upon the OAM specification.=C2=A0 This= was
=C2=A0 =C2=A0 discussed with the working group several times, and the OAM w= ording
=C2=A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 Are you really asking that we hold up RFC publication of the = NSH
=C2=A0 =C2=A0 document until we have agreement on all of the complex OAM is= sues
=C2=A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady rate of new = OAM
=C2=A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to indicate t= hat such
=C2=A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bi= t and wording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned t= hat NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document that had= not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM packet = before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit indicates pre= sence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as metadata or = as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and determ= inistic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in my opin= ion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern<= wbr>.com>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com>>>= wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a fe= w days with all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask th= e WG to review.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, w= e would have already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 th= e latest published version of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is mi= ssing TTL and all related changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 __________________________________________= _____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/mailman/l<= wbr>istinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailma= n/listinfo/sfc>



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--001a113cd4e8d498e805534832c1-- From nobody Sat Jul 1 14:35:15 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E73A9129ADD for ; Sat, 1 Jul 2017 14:35:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0b93Yj6x20fw for ; Sat, 1 Jul 2017 14:35:11 -0700 (PDT) Received: from mail-qk0-x22b.google.com (mail-qk0-x22b.google.com [IPv6:2607:f8b0:400d:c09::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ADC431200FC for ; Sat, 1 Jul 2017 14:35:10 -0700 (PDT) Received: by mail-qk0-x22b.google.com with SMTP id p21so123747763qke.3 for ; Sat, 01 Jul 2017 14:35:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=LgtqLF44GFTYY2B0SS5+kFQ5ZSMQvaS1hhOfnqSlimw=; b=kAhJNaMzmXWsQYNWRiF/a471ypl1ma2S3wTv3tgAr+2c43YuKbOIvZ5Ms2DjEfx0Mi RVvn1XU45LTTFXfMi+7zIyDsDZU7q+nn34C3qpsg/a7RZ4lglo7+EX0xnzMgniAFWWkp faTk03sOKq2GaRq92vmjOhE7McqHgBPTEbnv7/Y9VVPBHGkuwPGmWyI07igfbWyhPCmJ Zp2431VpHycmwAi04C5LNh+ZdNG2hyYMYApkhKhx8vbWGn2Nq7EjoDOl6LYxzx5lLqap 8NSz55L4mB6HBnKryTn7yg+JXDOzcefZKyKne3Gb14rGR1Uy3V2umR82Uc9V1qXgekXs 8OFw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=LgtqLF44GFTYY2B0SS5+kFQ5ZSMQvaS1hhOfnqSlimw=; b=FE8GQ5/+kEas1dypfVWnlNNHZA5fhLvk1h/D+IW3wVyUz4FupG2w9HXeO/V8dAT4ZP tEsWZ4v6N/ajvxHtFT6CHdtJwDz493n+pAxGiGoXi8OwXq23BgOBqZGlSlqY13+27ZR4 ln5HLiAuiMTgasxS37abnO6DWmhRywuTvJvKq2orBasEARNMGK/tDXA/m0hIEBQxnqp0 JXCwO9TFoy0xAe20lPkihjj6XkFWV8J8nDbN2URbm3G2bGwPPJdTE/+DteRw3pWLjYOU IjHoWxxuhdhRI/fJprBFfAN+4pXJJOzcgt6flNUdGbYbIth6d6hFAzqARsv31MD4Q9/p hYiw== X-Gm-Message-State: AKS2vOwJ2qLS+4rHU8g4rPqZCCOzR8F9VqyHkCoT7/XT2WRiaSG31qqP wdjZN46Qp+39CWTLZnBBjh9210hl+g== X-Received: by 10.55.155.141 with SMTP id d135mr31518746qke.11.1498944909748; Sat, 01 Jul 2017 14:35:09 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Sat, 1 Jul 2017 14:35:09 -0700 (PDT) In-Reply-To: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> From: Greg Mirsky Date: Sat, 1 Jul 2017 14:35:09 -0700 Message-ID: To: "Andrew G. Malis" Cc: "Joel M. Halpern" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c07684ae22fff0553484e0e" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 21:35:14 -0000 --94eb2c07684ae22fff0553484e0e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dear All, I agree and support changes suggested by Andrew. Regards, Greg On Sat, Jul 1, 2017 at 2:26 PM, Andrew G. Malis wrote: > Joel, > > I would like to suggest changing: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > to: > > O bit: Setting this bit indicates the presence of Operations, > Administration, and > Maintenance (OAM) information. The actual OAM information format and > processing > is outside the scope of this specification (see [oam-frame]). > > > The reason for this change is that we don=E2=80=99t yet know if the forma= t of OAM > information, and whether it will be in metadata, packet contents, or > both. Thus, we don=E2=80=99t yet even know if there will be =E2=80=9COAM = packets=E2=80=9D per se, > as data packets could possibly also carry OAM information in the metadata= . > > If this change is acceptable, then the following two paragraphs should > also be amended to: > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O bit set, but MAY support > a configurable parameter to enable forwarding received packets with th= e > O bit > set unmodified to the next element in the chain. Forwarding > packets with the O bit set unmodified by SFC elements that do not > support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding a packet with the O bit set for all > OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > The O bit MUST be set for packets containing OAM information and MUST > NOT be set for > packets without OAM information. The O bit MUST NOT be modified along > the SFP. > > > Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D and O-bit=E2=80= =9D used in the document. The > document should choose one. > > Thanks, > Andy > > > On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern > wrote: > >> The definition of the O bit in the document is: >> >> O bit: Setting this bit indicates an Operations, Administration, and >> Maintenance (OAM) packet. The actual packet format and processing of >> SFC OAM messages is outside the scope of this specification (see >> [oam-frame]). >> >> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >> OAM procedures SHOULD discard packets with O-bit set, but MAY support >> a configurable parameter to enable forwarding received SFC OAM >> packets unmodified to the next element in the chain. Forwarding OAM >> packets unmodified by SFC elements that do not support SFC OAM >> procedures may be acceptable for a subset of OAM functions, but can >> result in unexpected outcomes for others, thus it is recommended to >> analyze the impact of forwarding an OAM packet for all OAM functions >> prior to enabling this behavior. The configurable parameter MUST be >> disabled by default. >> >> The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM >> packets. The O-bit MUST NOT be modified along the SFP. >> >> This seems to me a VERY clear description of when the bit is to be set, >> and what handling is required when packets with this bit are received at= an >> NSH support entity. >> >> If you consider this wording unclear, please propose specific text to >> improve it. >> >> Yours, >> Joel >> >> On 7/1/17 5:02 PM, Greg Mirsky wrote: >> >>> Hi Joel, >>> by all means, I'm not asking to hold NSH document until SFC OAM >>> solutions progress. But NSH refers to OAM packet and, in my view, it is= too >>> ambiguous term. Please consider, OAM packet may be: >>> >>> * control message of active SFC OAM protocol carried as payload; >>> * control message of active SFC OAM protocol carried as metadata; >>> * control information and/or measurement results of hybrid SFC OAM >>> protocol carried as metadata >>> >>> If work on OAM framework is progressing, perhaps all the OAM related >>> discussion as well as allocation of the O-bit itself can be moved there= . >>> >>> As co-author of several SFC OAM drafts I'd note that none of them has >>> dependency on where OAM information must be placed, metadata or payload= . >>> But clear and unambiguous definitionsof OAM packet and interpretation o= f >>> O-bit are very much needed and will help to progress SFC OAM solutions. >>> >>> Regards, >>> Greg >>> >>> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern >> > wrote: >>> >>> Greg, the editors are working on the revision of the OAM Framework >>> document. >>> >>> >>> More importantly, we have been careful that the NSH document does >>> not normatively depend upon the OAM specification. This was >>> discussed with the working group several times, and the OAM wording >>> in -13 is the result of that discussion. >>> >>> >>> Are you really asking that we hold up RFC publication of the NSH >>> document until we have agreement on all of the complex OAM issues >>> (such as in-situ, etc.) I observe a steady rate of new OAM >>> proposals, with new behaviors. That seems to indicate that such >>> ahold-up would be almost indefinite. >>> >>> >>> Yours, >>> Joel M. Halpern >>> >>> On 7/1/17 3:39 PM, Greg Mirsky wrote: >>> >>> Hi Joel, Adrian, et. al, >>> you'd expect that I'll look into OAM bit and wording on OAM >>> packet first. And so I had. I'm concerned that NSH refers to >>> expired and, frankly, stalled document that had not been >>> discussed for too long. I believe the NSH document should have >>> or refer to clear definition of SFC OAM packet before it define= s >>> interpretation of O-bit flag. draft-farrel-sfc-convent correctl= y >>> points that in current form O-bit indicates presence of OAM >>> information which can be either as metadata or as payload. I >>> believe that we must have more clear and deterministic >>> definition of OAM packet as current, in my opinion, may cause >>> problems for HW-based SFC OAM support. >>> >>> Regards, >>> Greg >>> >>> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct >>> >>> >> >> wrote: >>> >>> The -13 will be out in a few days with all the changes. >>> That is what we will ask the WG to review. >>> If we already had it out, we would have already asked for >>> the WG to >>> take a last look. >>> >>> Yours, >>> Joel >>> >>> >>> On 6/29/17 7:21 PM, Greg Mirsky wrote: >>> >>> Hi Joel, >>> is the -12 the latest published version of the NSH >>> draft? As I >>> see, it is missing TTL and all related changes: >>> >>> >>> >>> >>> _______________________________________________ >>> sfc mailing list >>> sfc@ietf.org >>> https://www.ietf.org/mailman/listinfo/sfc >>> >>> >>> >>> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> > > --94eb2c07684ae22fff0553484e0e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear All,
I agree and support changes suggested by And= rew.

Regards,
Greg

On Sat, Jul 1, 2017 at 2:26= PM, Andrew G. Malis <agmalis@gmail.com> wrote:
Joel,

I would lik= e to suggest changing:

O bit: Setting this bit indicates an O= perations, Administration, and
=C2=A0 =C2=A0Maintena= nce (OAM) packet.=C2=A0 The actual packet format and processing of=C2=A0 =C2=A0SFC=C2=A0OAM messages is outside the scope of thi= s specification (see
=C2=A0 =C2=A0[oam-frame]).

to:

O bit: Setting this bit indicates the presence of Operati= ons, Administration, and
=C2=A0 =C2=A0Maintenance (O= AM) information.=C2=A0 The actual OAM information format and processing
=C2=A0 =C2=A0is outside the scope of this specification (see=C2=A0 [oam-frame]).


The reason for this change is that we don=E2=80=99t yet kn= ow if the format of OAM information, and whether it will be in metadata, pa= cket contents, or both.=C2=A0Thus, we don=E2=80=99t yet even know if=C2=A0t= here will be=C2=A0=E2=80=9COAM packets=E2=80=9D per se, as data packets=C2= =A0could possibly also carry OAM=C2=A0information in the metadata.

If=C2=A0this change i= s acceptable, then the following two paragraphs should also be amended to:<= /span>

=
= =C2=A0 =C2=A0SF/SFF/SFC=C2=A0Proxy/Classifer implementations that do not supp= ort=C2=A0SFC
=C2=A0 =C2=A0= OAM procedures SHOULD discard packets with O bit set, but MAY support
=C2=A0 =C2=A0a configurable parameter to enable forwardin= g received packets with the O bit
=C2=A0 =C2=A0set unmodified to the next element in t= he chain.=C2=A0 Forwarding
=C2=A0 =C2=A0packets with= the O bit set unmodified by=C2=A0SFC=C2=A0elements that do not support=C2= =A0SFC=C2=A0OAM
=C2=A0 =C2=A0procedur= es may be acceptable for a subset of OAM functions, but can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is r= ecommended to
=C2=A0 =C2=A0analyze the impact= of forwarding a packet with the O bit set for all OAM functions
=C2=A0 =C2=A0prior to enabling this behavior.= =C2=A0 The configurable parameter MUST be
=C2=A0 =C2= =A0disabled by default.
=
=C2=A0 =C2=A0The O bit MUST be set for packets cont= aining OAM information and MUST NOT be set for=C2=A0
=C2=A0 =C2=A0packets without OAM information.=C2=A0 The O bit MUST NOT be = modified along the SFP.
=

=

Finally,= I=E2=80=99ve seen both=C2=A0=E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D use= d in the document.=C2=A0The document should choose one.

Thanks,
Andy


On Sat, Jul 1, 2= 017 at 5:11 PM, Joel M. Halpern <jmh@joelhalpern.com> wrot= e:
The= definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC OAM messages is outside the scope of this specification (s= ee
=C2=A0 =C2=A0[oam-frame]).

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O-bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received SFC OAM=
=C2=A0 =C2=A0packets unmodified to the next element in the chain.=C2=A0 For= warding OAM
=C2=A0 =C2=A0packets unmodified by SFC elements that do not support SFC OAM=
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding an OAM packet for all OAM fun= ctions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:
Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutio= ns progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous term. Please consider, OAM packet may be:

 =C2=A0 * control message of active SFC OAM protocol carried as payload;
=C2=A0 * control message of active SFC OAM protocol carried as metadata; =C2=A0 * control information and/or measurement results of hybrid SFC OAM
=C2=A0 =C2=A0 protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has d= ependency on where OAM information must be placed, metadata or payload. But= clear and unambiguous definitionsof OAM packet and interpretation of O-bit= are very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com&= gt;> wrote:

=C2=A0 =C2=A0 Greg, the editors are working on the revision of the OAM Fram= ework
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 More importantly, we have been careful that the NSH document = does
=C2=A0 =C2=A0 not normatively depend upon the OAM specification.=C2=A0 This= was
=C2=A0 =C2=A0 discussed with the working group several times, and the OAM w= ording
=C2=A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 Are you really asking that we hold up RFC publication of the = NSH
=C2=A0 =C2=A0 document until we have agreement on all of the complex OAM is= sues
=C2=A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady rate of new = OAM
=C2=A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to indicate t= hat such
=C2=A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bi= t and wording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned t= hat NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document that had= not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM packet = before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit indicates pre= sence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as metadata or = as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and determ= inistic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in my opin= ion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern<= wbr>.com>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com>>>= wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a fe= w days with all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask th= e WG to review.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, w= e would have already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 th= e latest published version of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is mi= ssing TTL and all related changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 __________________________________________= _____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/mailman/l<= wbr>istinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailma= n/listinfo/sfc>


=

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc<= /a>


--94eb2c07684ae22fff0553484e0e-- From nobody Sun Jul 2 17:13:56 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A144712F29A for ; Sun, 2 Jul 2017 17:13:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9rASgZ49VpPx for ; Sun, 2 Jul 2017 17:13:52 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D1383129B2D for ; Sun, 2 Jul 2017 17:13:52 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id B8179245EA1 for ; Sun, 2 Jul 2017 17:13:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1499040832; bh=qhLyPzgOxXpdFh7R20a3ZwJrCQ3Ifc9Q/ht3ilaE6eY=; h=From:Subject:To:References:Date:In-Reply-To:From; b=doX6yUxe7HoZ1/xmR6LRnPMcciK6oteAR/A5QjB0zdV473VqvNqm4E/+QL+1sp7/1 JoVbOugxbJtwbgPGCxIzg37MIkoLR+dHylnt4lnS1xYF85XEzbxhHP+gri0kOgcJOF F3bZ4qZFnKOFng7k0e9zfDdkUmdBclX22y1gkW8w= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 5AE3B245C3B for ; Sun, 2 Jul 2017 17:13:52 -0700 (PDT) From: Joel Halpern To: "sfc@ietf.org" References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> Message-ID: <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> Date: Sun, 2 Jul 2017 20:13:51 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <149882241880.4694.1755169430753503252@ietfa.amsl.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 00:13:54 -0000 Below is the announcement of -13 of the NSH document. To the best of the chairs and editors ability, this reflects all comments we have received, in accordance with the rough consensus of the WG as best the chairs were able to determine it. We think it is done. Please take a look. Our goal is to hand this document to the IESG by the IETF meeting. As such, we would like all comments to be in by 14-July-2017. Yours, Joel and Jim PS: Unless someone objects, we will accept the OAM clarification Andy Malis sent to the list. -------- Forwarded Message -------- Subject: I-D Action: draft-ietf-sfc-nsh-13.txt Date: Fri, 30 Jun 2017 04:33:38 -0700 From: internet-drafts@ietf.org Reply-To: internet-drafts@ietf.org To: i-d-announce@ietf.org CC: sfc@ietf.org A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Network Service Header Authors : Paul Quinn Uri Elzur Filename : draft-ietf-sfc-nsh-13.txt Pages : 37 Date : 2017-06-30 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service path. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) Architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-13 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-13 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-13 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt From nobody Mon Jul 3 08:18:25 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B3D4113165D; Mon, 3 Jul 2017 08:18:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149909510468.22849.6186958454591893595@ietfa.amsl.com> Date: Mon, 03 Jul 2017 08:18:24 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-oam-framework-02.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 15:18:25 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Service Function Chaining Operation, Administration and Maintenance Framework Authors : Sam K. Aldrin Carlos Pignataro Nagendra Kumar Nobo Akiya Ram Krishnan Anoop Ghanwani Filename : draft-ietf-sfc-oam-framework-02.txt Pages : 16 Date : 2017-07-03 Abstract: This document provides reference framework for Operations, Administration and Maintenance (OAM) for Service Function Chaining (SFC). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-02 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-oam-framework-02 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-oam-framework-02 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Jul 3 16:59:15 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 90FC5131828 for ; Mon, 3 Jul 2017 16:59:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com 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XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Mon, 3 Jul 2017 19:58:46 -0400 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: "sfc@ietf.org" , "Fioccola Giuseppe (giuseppe.fioccola@telecomitalia.it)" Thread-Topic: [sfc] Use of Alternate Marking Method in SFC Thread-Index: AQHS5R4QYKyZsCIieEuX+UI66hl366JDKW8A Date: Mon, 3 Jul 2017 23:58:46 +0000 Message-ID: <624141DA-3092-4AF6-B103-1DA614701B10@cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: multipart/alternative; boundary="_000_624141DA30924AF6B1031DA614701B10ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Use of Alternate Marking Method in SFC X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: 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Subject: Re: [sfc] Use of Alternate Marking Method in SFC X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 00:13:13 -0000 --001a113c25ca893e0d055372bf0c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, we've received the same comment as #2 from Tal and have clarified location and IANA consideration in version -01. As for your first question. There are many advantages of Alternate Marking methods that we will be glad to discuss during our presentation at SFC meeting in Prague. We'll improve wording that characterizes alternate marking method as producing measurement as near passive method according to RFC 7799. Regards, Greg On Mon, Jul 3, 2017 at 4:58 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi Greg, Ciao Giuseppe! > > Thanks for sharing this document with SFC! > > Looking at it, I have three main high-level comments: > > 1. Overall: While clearly I see the usability of this, I wonder if > this is too narrow of a solution in presence of things like IOAM that = allow > to do marking as well as much richer set of performance measurements. > 2. Syntax: The draft talks about two bits, but their location is not > specified! That makes for an IANA Considerations section that is trivi= al. > (or going back to #1, the two bits coulee have easily be placed in IOA= M. > 3. =E2=80=9Ccan be viewed as true example of passive performance=E2=80= =9D -> The > definition from RFC 7799 seems to potentially disagree with this. > > > Thanks! > > Carlos. > > On Jun 14, 2017, at 10:53 AM, Greg Mirsky wrote: > > Dear All, > would like to bring your attention to the draft Performance Measurement > (PM) with Alternate Marking Method in Service > Function Chaining > (SFC) Domain we'= ve > submitted earlier. Alternate Marking method allows performance measuremen= t > performed close to passive measurement methods. > Greatly appreciate your questions, comments, and suggestions. > > Regards, > Greg > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > --001a113c25ca893e0d055372bf0c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
we've received the same comment as #2 f= rom Tal and have clarified location and IANA consideration in version -01.<= /div>
As for your first question. There are many advantages of Alternat= e Marking methods that we will be glad to discuss during our presentation a= t SFC meeting in Prague.
We'll improve wording that character= izes alternate marking method as producing measurement as near passive meth= od according to RFC 7799.

Regards,
Greg<= /div>

On Mon= , Jul 3, 2017 at 4:58 PM, Carlos Pignataro (cpignata) <= ;cpignata@cisco.com= > wrote:
Hi Greg, Ciao Giuseppe!

Thanks for sharing this document with SFC!

Looking at it, I have three main high-level comments:
  1. Overall: While clearly I see the usability of this, I wonder if this is= too narrow of a solution in presence of things like IOAM that allow to do = marking as well as much richer set of performance measurements.=C2=A0
    2. <= li>Syntax: The draft talks about two bits, but their location is not specif= ied! That makes for an IANA Considerations section that is trivial. (or goi= ng back to #1, the two bits coulee have easily be placed in IOAM.
  2. = =E2=80=9Ccan be viewed as true example of passive performance=E2=80=9D ->= ; The definition from RFC 7799 seems to potentially disagree with this.

Thanks!

Carlos.

On Jun 14, 2017, at 10:53 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
would like to bring your attention to the draft=C2=A0=C2=A0Performance Me= asurement (PM) with Alternate Marking Method in Service=C2=A0

Function Chaining (SFC) Domain=C2=A0=

we've submitted earlier. Alternate Marking method allows perform= ance measurement performed close to passive measurement methods.
Greatly appreciate your questions, comments, and suggestions.

Regards,
Greg


_______________________________________________
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


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d="scan'208";a="265553388" Received: from alln-core-6.cisco.com ([173.36.13.139]) by rcdn-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 04 Jul 2017 00:34:23 +0000 Received: from XCH-RTP-020.cisco.com (xch-rtp-020.cisco.com [64.101.220.160]) by alln-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id v640YNaR015113 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 4 Jul 2017 00:34:23 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-020.cisco.com (64.101.220.160) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 3 Jul 2017 20:34:22 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Mon, 3 Jul 2017 20:34:22 -0400 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: Joel Halpern Direct , Adrian Farrel , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAG7gVAA= Date: Tue, 4 Jul 2017 00:34:22 +0000 Message-ID: <00BE3B10-346A-4364-8E39-421357D8DC7C@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: text/plain; 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Malis" CC: "Joel M. Halpern" , Greg Mirsky , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgA== Date: Tue, 4 Jul 2017 00:37:41 +0000 Message-ID: <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: multipart/alternative; boundary="_000_33CEB96C04F14FEB8B18D257DF1531C8ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] 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14.03.0352.000; Tue, 4 Jul 2017 07:32:59 +0200 From: To: "Carlos Pignataro (cpignata)" , "Andrew G. Malis" CC: Greg Mirsky , "Joel M. Halpern" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAB5OkA Date: Tue, 4 Jul 2017 05:32:59 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A00048A@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> In-Reply-To: <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.3] Content-Type: multipart/alternative; boundary="_000_787AE7BB302AE849A7480A190F8B93300A00048AOPEXCLILMA3corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 05:33:05 -0000 --_000_787AE7BB302AE849A7480A190F8B93300A00048AOPEXCLILMA3corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgQW5keSwgYWxsLA0KDQpJIGFncmVlIHdpdGggQ2FybG9zLg0KDQpDaGVlcnMsDQpNZWQNCg0K RGUgOiBzZmMgW21haWx0bzpzZmMtYm91bmNlc0BpZXRmLm9yZ10gRGUgbGEgcGFydCBkZSBDYXJs b3MgUGlnbmF0YXJvIChjcGlnbmF0YSkNCkVudm95w6kgOiBtYXJkaSA0IGp1aWxsZXQgMjAxNyAw MjozOA0Kw4AgOiBBbmRyZXcgRy4gTWFsaXMNCkNjIDogR3JlZyBNaXJza3k7IEpvZWwgTS4gSGFs cGVybjsgc2ZjQGlldGYub3JnDQpPYmpldCA6IFJlOiBbc2ZjXSBTdGF0dXMgb2YgZHJhZnQtaWV0 Zi1zZmMtbnNoIFtXYXM6IE1lZXRpbmcgYXQgSUVURiA5OSBpbiBQcmFndWVdDQoNCkhpIEFuZHks DQoNCkkgYmVsaWV2ZSB0aGF0IHMvcGFja2V0L2luZm9ybWF0aW9uLyBjYW4gYWN0dWFsbHkgY2F1 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<3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> From: Greg Mirsky Date: Mon, 3 Jul 2017 22:41:23 -0700 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "Andrew G. Malis" , "Joel M. Halpern" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c067ebc83962a05537755cb" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 05:41:29 -0000 --94eb2c067ebc83962a05537755cb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, you have valid interpretation of the text in its current version. And I think that if it was in the document as you have presented (or very close to it), it would address my concern, as you've provided clear and unambiguous definition of what considered as OAM packet in SFC - packet that carries OAM information as payload that immediately follows the NSH. Regards, Greg On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi Andy, > > I believe that s/packet/information/ can actually cause more confusion > that bring clarity. > > O=3D0 means that the payload is a user packet. O=3D1 means the payload is= an > OAM packet. > > However, this is independent of the Metadata, since some Metadata can be > OAM-ish (as a timestamp). And this is also independent of a NULL payload = as > in Adrian=E2=80=99s draft. > > A user packet with OAM-ish metadata will have O=3D0. > > The text can always be polished more =E2=80=94 I am not sure if we might = be in > diminishing return territory. > > (I would not oppose a clarification that speaks to the metadata > independence of O for user packets, although maybe that does belong in > other documents) > > Thanks! > > Carlos. > > On Jul 1, 2017, at 5:26 PM, Andrew G. Malis wrote: > > Joel, > > I would like to suggest changing: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > to: > > O bit: Setting this bit indicates the presence of Operations, > Administration, and > Maintenance (OAM) information. The actual OAM information format and > processing > is outside the scope of this specification (see [oam-frame]). > > > The reason for this change is that we don=E2=80=99t yet know if the forma= t of OAM > information, and whether it will be in metadata, packet contents, or > both. Thus, we don=E2=80=99t yet even know if there will be =E2=80=9COAM = packets=E2=80=9D per se, > as data packets could possibly also carry OAM information in the metadata= . > > If this change is acceptable, then the following two paragraphs should > also be amended to: > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O bit set, but MAY support > a configurable parameter to enable forwarding received packets with th= e > O bit > set unmodified to the next element in the chain. Forwarding > packets with the O bit set unmodified by SFC elements that do not > support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding a packet with the O bit set for all > OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > The O bit MUST be set for packets containing OAM information and MUST > NOT be set for > packets without OAM information. The O bit MUST NOT be modified along > the SFP. > > > Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D and O-bit=E2=80= =9D used in the document. The > document should choose one. > > Thanks, > Andy > > > On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern > wrote: > >> The definition of the O bit in the document is: >> >> O bit: Setting this bit indicates an Operations, Administration, and >> Maintenance (OAM) packet. The actual packet format and processing of >> SFC OAM messages is outside the scope of this specification (see >> [oam-frame]). >> >> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >> OAM procedures SHOULD discard packets with O-bit set, but MAY support >> a configurable parameter to enable forwarding received SFC OAM >> packets unmodified to the next element in the chain. Forwarding OAM >> packets unmodified by SFC elements that do not support SFC OAM >> procedures may be acceptable for a subset of OAM functions, but can >> result in unexpected outcomes for others, thus it is recommended to >> analyze the impact of forwarding an OAM packet for all OAM functions >> prior to enabling this behavior. The configurable parameter MUST be >> disabled by default. >> >> The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM >> packets. The O-bit MUST NOT be modified along the SFP. >> >> This seems to me a VERY clear description of when the bit is to be set, >> and what handling is required when packets with this bit are received at= an >> NSH support entity. >> >> If you consider this wording unclear, please propose specific text to >> improve it. >> >> Yours, >> Joel >> >> On 7/1/17 5:02 PM, Greg Mirsky wrote: >> >>> Hi Joel, >>> by all means, I'm not asking to hold NSH document until SFC OAM >>> solutions progress. But NSH refers to OAM packet and, in my view, it is= too >>> ambiguous term. Please consider, OAM packet may be: >>> >>> * control message of active SFC OAM protocol carried as payload; >>> * control message of active SFC OAM protocol carried as metadata; >>> * control information and/or measurement results of hybrid SFC OAM >>> protocol carried as metadata >>> >>> If work on OAM framework is progressing, perhaps all the OAM related >>> discussion as well as allocation of the O-bit itself can be moved there= . >>> >>> As co-author of several SFC OAM drafts I'd note that none of them has >>> dependency on where OAM information must be placed, metadata or payload= . >>> But clear and unambiguous definitionsof OAM packet and interpretation o= f >>> O-bit are very much needed and will help to progress SFC OAM solutions. >>> >>> Regards, >>> Greg >>> >>> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern >> > wrote: >>> >>> Greg, the editors are working on the revision of the OAM Framework >>> document. >>> >>> >>> More importantly, we have been careful that the NSH document does >>> not normatively depend upon the OAM specification. This was >>> discussed with the working group several times, and the OAM wording >>> in -13 is the result of that discussion. >>> >>> >>> Are you really asking that we hold up RFC publication of the NSH >>> document until we have agreement on all of the complex OAM issues >>> (such as in-situ, etc.) I observe a steady rate of new OAM >>> proposals, with new behaviors. That seems to indicate that such >>> ahold-up would be almost indefinite. >>> >>> >>> Yours, >>> Joel M. Halpern >>> >>> On 7/1/17 3:39 PM, Greg Mirsky wrote: >>> >>> Hi Joel, Adrian, et. al, >>> you'd expect that I'll look into OAM bit and wording on OAM >>> packet first. And so I had. I'm concerned that NSH refers to >>> expired and, frankly, stalled document that had not been >>> discussed for too long. I believe the NSH document should have >>> or refer to clear definition of SFC OAM packet before it define= s >>> interpretation of O-bit flag. draft-farrel-sfc-convent correctl= y >>> points that in current form O-bit indicates presence of OAM >>> information which can be either as metadata or as payload. I >>> believe that we must have more clear and deterministic >>> definition of OAM packet as current, in my opinion, may cause >>> problems for HW-based SFC OAM support. >>> >>> Regards, >>> Greg >>> >>> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct >>> >>> >> >> wrote: >>> >>> The -13 will be out in a few days with all the changes. >>> That is what we will ask the WG to review. >>> If we already had it out, we would have already asked for >>> the WG to >>> take a last look. >>> >>> Yours, >>> Joel >>> >>> >>> On 6/29/17 7:21 PM, Greg Mirsky wrote: >>> >>> Hi Joel, >>> is the -12 the latest published version of the NSH >>> draft? As I >>> see, it is missing TTL and all related changes: >>> >>> >>> >>> >>> _______________________________________________ >>> sfc mailing list >>> sfc@ietf.org >>> https://www.ietf.org/mailman/listinfo/sfc >>> >>> >>> >>> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > --94eb2c067ebc83962a05537755cb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
you have valid interpretation of the text i= n its current version. And I think that if it was in the document as you ha= ve presented (or very close to it), it would address my concern, as you'= ;ve provided clear and unambiguous definition of what considered as OAM pac= ket in SFC - packet that carries OAM information as payload that immediatel= y follows the NSH.

Regards,
Greg

On Mon, Jul 3= , 2017 at 5:37 PM, Carlos Pignataro (cpignata) <cpignata@cisco.com>= ; wrote:
Hi Andy,

I believe that s/packet/information/ can actually cause more confusion= that bring clarity.

O=3D0 means that the payload is a user packet. O=3D1 means the payload= is an OAM packet.=C2=A0

However, this is independent of the Metadata, since some Metadata can = be OAM-ish (as a timestamp). And this is also independent of a NULL payload= as in Adrian=E2=80=99s draft.

A user packet with OAM-ish metadata will have O=3D0.

The text can always be polished more =E2=80=94 I am not sure if we mig= ht be in diminishing return territory.

(I would not oppose a clarification that speaks to the metadata indepe= ndence of O for user packets, although maybe that does belong in other docu= ments)

Thanks!

Carlos.

On Jul 1, 2017, at 5:26 PM, Andrew G. Malis <agmalis@gmail.com> wrote:

Joel,

I would like to suggest changing:

O bit: Setting this bit= indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OA= M) packet.=C2=A0 The actual packet format and processing of
=C2=A0 =C2=A0SFC=C2=A0OAM mes= sages is outside the scope of this specification (see
=C2=A0 =C2=A0[oam-frame]).

to:

O bit: Setting this bit= indicates the presence of Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OA= M) information.=C2=A0 The actual OAM information format and processing
=C2=A0 =C2=A0is outside= the scope of this specification (see=C2=A0 [oam-frame]).


The reason for this cha= nge is that we don=E2=80=99t yet know if the format of OAM information, and= whether it will be in metadata, packet contents, or both.=C2=A0Thus, we do= n=E2=80=99t yet even know if=C2=A0there will be=C2=A0=E2=80=9COAM packets=E2=80=9D per se, as data packets=C2=A0could p= ossibly also carry OAM=C2=A0information in the metadata.

If=C2=A0this change is = acceptable, then the following two paragraphs should also be amended to:

=C2=A0 =C2=A0SF/SFF/SFC= =C2=A0Proxy/Classifer implementations that do not support=C2=A0SFC
=C2=A0 =C2=A0OAM procedures = SHOULD discard packets with O bit set, but MAY support
=C2=A0 =C2=A0a configurable = parameter to enable forwarding received packets with the O bit
=C2=A0 =C2=A0set unmodi= fied to the next element in the chain.=C2=A0 Forwarding
=C2=A0 =C2=A0packets with th= e O bit set unmodified by=C2=A0SFC=C2=A0elements that do not support=C2=A0SFC= =C2=A0OAM
=C2=A0 =C2=A0procedures may = be acceptable for a subset of OAM functions, but can
=C2=A0 =C2=A0result in unexp= ected outcomes for others, thus it is recommended to
=C2=A0 =C2=A0analyze the imp= act of forwarding a packet with the O bit set for all OAM functions<= br style=3D"font-size:12.800000190734863px"> =C2=A0 =C2=A0prior to enabli= ng this behavior.=C2=A0 The configurable parameter MUST be
=C2=A0 =C2=A0disabled by def= ault.

=C2=A0 =C2=A0The O bit MUST = be set for packets containing OAM information and MUST NOT be set for=C2=A0=
=C2=A0 =C2=A0packets without= OAM information.=C2=A0 The O bit MUST NOT be modified along the SFP.


Finally, I=E2=80=99ve s= een both=C2=A0=E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D used in the docume= nt.=C2=A0The document should choose one.

Thanks,
Andy


On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern = <jmh@joelhalper= n.com> wrote:
The definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC OAM messages is outside the scope of this specification (s= ee
=C2=A0 =C2=A0[oam-frame]).

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O-bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received SFC OAM=
=C2=A0 =C2=A0packets unmodified to the next element in the chain.=C2=A0 For= warding OAM
=C2=A0 =C2=A0packets unmodified by SFC elements that do not support SFC OAM=
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding an OAM packet for all OAM fun= ctions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:
Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutio= ns progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous term. Please consider, OAM packet may be:

=C2=A0 * control message of active SFC OAM protocol carried as paylo= ad;
=C2=A0 * control message of active SFC OAM protocol carried as metadata; =C2=A0 * control information and/or measurement results of hybrid SFC OAM
=C2=A0 =C2=A0 protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has d= ependency on where OAM information must be placed, metadata or payload. But= clear and unambiguous definitionsof OAM packet and interpretation of O-bit= are very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joe= l M. Halpern <j= mh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote:

=C2=A0 =C2=A0 Greg, the editors are working on the revision of the OAM Fram= ework
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 More importantly, we have been careful that the NSH document = does
=C2=A0 =C2=A0 not normatively depend upon the OAM specification.=C2=A0 This= was
=C2=A0 =C2=A0 discussed with the working group several times, and the OAM w= ording
=C2=A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 Are you really asking that we hold up RFC publication of the = NSH
=C2=A0 =C2=A0 document until we have agreement on all of the complex OAM is= sues
=C2=A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady rate of new = OAM
=C2=A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to indicate t= hat such
=C2=A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bi= t and wording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned t= hat NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document that had= not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM packet = before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit indicates pre= sence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as metadata or = as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and determ= inistic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in my opin= ion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern<= wbr>.com>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com>>>= wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a fe= w days with all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask th= e WG to review.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, w= e would have already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 th= e latest published version of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is mi= ssing TTL and all related changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 __________________________________________= _____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/mailman/listinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailma= n/listinfo/sfc>



_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

_______________________________________________
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


--94eb2c067ebc83962a05537755cb-- From nobody Tue Jul 4 00:02:31 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E16FE131893 for ; Tue, 4 Jul 2017 00:02:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tJRxe3N1Q7s8 for ; Tue, 4 Jul 2017 00:02:28 -0700 (PDT) Received: from mail-wm0-x232.google.com (mail-wm0-x232.google.com [IPv6:2a00:1450:400c:c09::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2841413186F for ; Tue, 4 Jul 2017 00:02:28 -0700 (PDT) Received: by mail-wm0-x232.google.com with SMTP id f67so74280964wmh.1 for ; Tue, 04 Jul 2017 00:02:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=R5e4Q2ve2ImJtNsmQBmtj0n25ufLYVMvKH0UAtfZUHE=; b=bNV+b47UlKxUVw2bbtAbBGlMmXLIO8XWAUCelJrh3pvEKl+JeJIfZtlfUwD1IJrVT4 65IBIrDXbKnf0HXko0OKwAsEJ8cm7pv5X1o434zEA8VSvWMi9alXH2BxuYZx9V6wYed8 YmH86ID5ACuXQXhouRKiRx/zyQVcGXg8rgPNMmnFlqvQv79aaMllh1eKWi98rIUjP+Di jtxWBM1+gvIQ/6K4GleoHK1i/b5rmNhfq0BjY10fhz7kd8PlWFiQ+exEltbrAnBziQmO tq0/6tL6nOljQ462p316rbkquxSY2yqSSgn/kfxThGCYfpjlqg3JDdZB+NCCawNhgwrL RoKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=R5e4Q2ve2ImJtNsmQBmtj0n25ufLYVMvKH0UAtfZUHE=; b=TyLjvxEqQAxHYBAeAXXy4I4nV0Pr6tZgTycIggbMDAfbAsGUGpyudr4GIztDK9YteT 2X+Mip3Tzoj9WFRljxSSGwz4SBFLg3lrfbTosD+e8w3AXedbSl8Iufan2m4W7Ttb5PWl CZQ/8O7Rhdojpv7JBwqmD9FQGcTsXvfQRLFoDDNTC+sQH5AxuJiRdiX7nPmY/I4eFZpe 6btBAe4rDHKPbixAfiitQpe7cEM6YRi3utplZN5FPs4wuEI+12ndWwPrme9tWLWsrK/z f2IqeZqDjOWCV6uFHBISptPbajolfkd878kE/VEgShuG18OPD9RA/MuqEzXmfRjWwZsc zR0w== X-Gm-Message-State: AKS2vOwYQHNP3aeIPAO+BwM2cZ3eoimimQfJg+MSDRuoEkUooM1R7gJx bN+K2vwMK/nutxRhzwxMP9/7p8bHDg== X-Received: by 10.80.139.151 with SMTP id m23mr16929801edm.140.1499151746733; Tue, 04 Jul 2017 00:02:26 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.170.19 with HTTP; Tue, 4 Jul 2017 00:02:26 -0700 (PDT) In-Reply-To: <624141DA-3092-4AF6-B103-1DA614701B10@cisco.com> References: <624141DA-3092-4AF6-B103-1DA614701B10@cisco.com> From: Tal Mizrahi Date: Tue, 4 Jul 2017 10:02:26 +0300 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: Greg Mirsky , "Fioccola Giuseppe (giuseppe.fioccola@telecomitalia.it)" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="f403045c218654207205537877cf" Archived-At: Subject: Re: [sfc] Use of Alternate Marking Method in SFC X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 07:02:31 -0000 --f403045c218654207205537877cf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, My perspective regarding #1 (I can't claim to be impartial, since I am taking part in both IOAM and Alternate Marking :) is that IOAM and Alternate Marking are not competing technologies, but complementary technologies. IOAM provides fine-grained measurement with per-packet and per-hop information, but comes at the cost of extending the data packets. Alternate Marking, on the other hand, provides very accurate per-flow measurement, at the cost of 1 or 2 bits per packet. Based on this tradeoff, some operators may choose to use IOAM, others may use Alternate Marking, and some may use both. Cheers, Tal. On Tue, Jul 4, 2017 at 2:58 AM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi Greg, Ciao Giuseppe! > > Thanks for sharing this document with SFC! > > Looking at it, I have three main high-level comments: > > 1. Overall: While clearly I see the usability of this, I wonder if > this is too narrow of a solution in presence of things like IOAM that = allow > to do marking as well as much richer set of performance measurements. > 2. Syntax: The draft talks about two bits, but their location is not > specified! That makes for an IANA Considerations section that is trivi= al. > (or going back to #1, the two bits coulee have easily be placed in IOA= M. > 3. =E2=80=9Ccan be viewed as true example of passive performance=E2=80= =9D -> The > definition from RFC 7799 seems to potentially disagree with this. > > > Thanks! > > Carlos. > > On Jun 14, 2017, at 10:53 AM, Greg Mirsky wrote: > > Dear All, > would like to bring your attention to the draft Performance Measurement > (PM) with Alternate Marking Method in Service > Function Chaining > (SFC) Domain we'= ve > submitted earlier. Alternate Marking method allows performance measuremen= t > performed close to passive measurement methods. > Greatly appreciate your questions, comments, and suggestions. > > Regards, > Greg > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > --f403045c218654207205537877cf Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,

My perspective regarding #1 = (I can't claim to be impartial, since I am taking part in both IOAM and= Alternate Marking :) is that IOAM and Alternate Marking are not competing = technologies, but complementary technologies. IOAM provides fine-grained me= asurement with per-packet and per-hop information, but comes at the cost of= extending the data packets. Alternate Marking, on the other hand, provides= very accurate per-flow measurement, at the cost of 1 or 2 bits per packet.= Based on this tradeoff, some operators may choose to use IOAM, others may = use Alternate Marking, and some may use both.=C2=A0

Cheers,
Tal.

On Tue, Jul 4, 2017 at 2:58 AM, Carlos Pignataro (cp= ignata) <cpignata@cisco.com> wrote:
Hi Greg, Ciao Giuseppe!

Thanks for sharing this document with SFC!

Looking at it, I have three main high-level comments:
  1. Overall: While clearly I see the usability of this, I wonder if this is= too narrow of a solution in presence of things like IOAM that allow to do = marking as well as much richer set of performance measurements.=C2=A0
    2. <= li>Syntax: The draft talks about two bits, but their location is not specif= ied! That makes for an IANA Considerations section that is trivial. (or goi= ng back to #1, the two bits coulee have easily be placed in IOAM.
  2. = =E2=80=9Ccan be viewed as true example of passive performance=E2=80=9D ->= ; The definition from RFC 7799 seems to potentially disagree with this.

Thanks!

Carlos.

On Jun 14, 2017, at 10:53 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
would like to bring your attention to the draft=C2=A0=C2=A0Performance Me= asurement (PM) with Alternate Marking Method in Service=C2=A0

Function Chaining (SFC) Domain=C2=A0=

we've submitted earlier. Alternate Marking method allows perform= ance measurement performed close to passive measurement methods.
Greatly appreciate your questions, comments, and suggestions.

Regards,
Greg


_______________________________________________
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc


--f403045c218654207205537877cf-- From nobody Tue Jul 4 07:53:42 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A2731320C5 for ; Tue, 4 Jul 2017 07:53:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ImgsZjwqNzC0 for ; Tue, 4 Jul 2017 07:53:39 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D705912EB9B for ; Tue, 4 Jul 2017 07:53:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:Cc:To:References:Subject:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=arSaObJh3Iif8kw7lxJXQjf/qq7Z+UAAlLo09psu488=; b=y7x2h1C9Ugu2bu8Qi8lx0f+Kk 8XKX+6Mo3Xb6oHbU/h8QU5GGh1dtOiHtA73KxjtuwPZcVFGxZZHQ2L/6YokTWp+xphN8m0I+VXScB N0592sl59//mGF/w/pwktWB7V4WfQgtfot0LQ23QgcQdiA1hQkCVtOc1eX9QsPHtYDD4CsIhcml2h kaq1zETKsG/Lc70RTSimgH4/cPAFRumUMDqgp8woQlpVgJeamxZpd6xLPyhRXYSVApNifdCCfpJwF mh4YNcMk5w8P1MQhnP8exAxyi6Er+JfD6+UfDp39ukNsBB/JTAouTyHZkeWW0SV0kS8hZJhLVARIe /okWH1mdA==; Received: from [31.185.128.124] (port=48374 helo=[192.168.0.13]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from ) id 1dSPCr-0005ud-D7; Tue, 04 Jul 2017 15:53:37 +0100 References: <149912539134.16172.12208741837601724106@ietfa.amsl.com> To: mohamed.boucadair@orange.com Cc: Service Function Chaining IETF list From: Bob Briscoe X-Forwarded-Message-Id: <149912539134.16172.12208741837601724106@ietfa.amsl.com> Message-ID: <02623a5a-675b-d92b-4ede-610a4d3bae7d@bobbriscoe.net> Date: Tue, 4 Jul 2017 15:53:36 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <149912539134.16172.12208741837601724106@ietfa.amsl.com> Content-Type: multipart/alternative; boundary="------------B7E1E96361696627D9A498C1" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: [sfc] Fwd: [tsvwg] I-D Action: draft-ietf-tsvwg-rfc6040update-shim-04.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 14:53:41 -0000 This is a multi-part message in MIME format. --------------B7E1E96361696627D9A498C1 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Mohamed, As requested, I am fwd'ing the new version announcement to the sfc list. The only delta was to use your words to describe the SFC architecture (with slight changes). Bob -------- Forwarded Message -------- Subject: [tsvwg] I-D Action: draft-ietf-tsvwg-rfc6040update-shim-04.txt Date: Mon, 03 Jul 2017 16:43:11 -0700 From: internet-drafts@ietf.org To: i-d-announce@ietf.org CC: tsvwg@ietf.org A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Transport Area Working Group of the IETF. Title : Propagating Explicit Congestion Notification Across IP Tunnel Headers Separated by a Shim Author : Bob Briscoe Filename : draft-ietf-tsvwg-rfc6040update-shim-04.txt Pages : 16 Date : 2017-07-03 Abstract: RFC 6040 on "Tunnelling of Explicit Congestion Notification" made the rules for propagation of ECN consistent for all forms of IP in IP tunnel. This specification updates RFC 6040 to clarify that its scope includes tunnels where two IP headers are separated by at least one shim header that is not sufficient on its own for wide area packet forwarding. It surveys widely deployed IP tunnelling protocols separated by such shim header(s) and updates the specifications of those that do not mention ECN propagation (L2TPv2, L2TPv3, GRE and Teredo). This specification also updates RFC 6040 with configuration requirements needed to make any legacy tunnel ingress safe. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rfc6040update-shim/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tsvwg-rfc6040update-shim-04 https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-rfc6040update-shim-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-rfc6040update-shim-04 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ --------------B7E1E96361696627D9A498C1 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Mohamed,

As requested, I am fwd'ing the new version announcement to the sfc list.

The only delta was to use your words to describe the SFC architecture (with slight changes).


Bob


-------- Forwarded Message --------
Subject: [tsvwg] I-D Action: draft-ietf-tsvwg-rfc6040update-shim-04.txt
Date: Mon, 03 Jul 2017 16:43:11 -0700
From: internet-drafts@ietf.org
To: i-d-announce@ietf.org
CC: tsvwg@ietf.org 


A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Area Working Group of the IETF.

        Title           : Propagating Explicit Congestion Notification Across IP Tunnel Headers Separated by a Shim
        Author          : Bob Briscoe
	Filename        : draft-ietf-tsvwg-rfc6040update-shim-04.txt
	Pages           : 16
	Date            : 2017-07-03

Abstract:
   RFC 6040 on "Tunnelling of Explicit Congestion Notification" made the
   rules for propagation of ECN consistent for all forms of IP in IP
   tunnel.  This specification updates RFC 6040 to clarify that its
   scope includes tunnels where two IP headers are separated by at least
   one shim header that is not sufficient on its own for wide area
   packet forwarding.  It surveys widely deployed IP tunnelling
   protocols separated by such shim header(s) and updates the
   specifications of those that do not mention ECN propagation (L2TPv2,
   L2TPv3, GRE and Teredo).  This specification also updates RFC 6040
   with configuration requirements needed to make any legacy tunnel
   ingress safe.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rfc6040update-shim/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-tsvwg-rfc6040update-shim-04
https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-rfc6040update-shim-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-rfc6040update-shim-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
--------------B7E1E96361696627D9A498C1-- From nobody Tue Jul 4 10:14:44 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E45581324A4 for ; Tue, 4 Jul 2017 10:14:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.202 X-Spam-Level: X-Spam-Status: No, score=-4.202 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uWLte1VW1nXN for ; Tue, 4 Jul 2017 10:14:32 -0700 (PDT) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1DBBC1324A1 for ; Tue, 4 Jul 2017 10:14:32 -0700 (PDT) Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga104.jf.intel.com with ESMTP; 04 Jul 2017 10:14:31 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,309,1496127600"; d="scan'208";a="122679263" Received: from irsmsx104.ger.corp.intel.com ([163.33.3.159]) by fmsmga006.fm.intel.com with ESMTP; 04 Jul 2017 10:14:30 -0700 Received: from irsmsx101.ger.corp.intel.com ([169.254.1.242]) by IRSMSX104.ger.corp.intel.com ([169.254.5.26]) with mapi id 14.03.0319.002; Tue, 4 Jul 2017 18:14:30 +0100 From: "Duarte Cardoso, Igor" To: Joel Halpern , "sfc@ietf.org" Thread-Topic: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt Thread-Index: AQHS85FHLGN/Sfu4NkaJqACSplon8KJD6Q0Q Date: Tue, 4 Jul 2017 17:14:29 +0000 Deferred-Delivery: Tue, 4 Jul 2017 17:14:07 +0000 Message-ID: References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> In-Reply-To: <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiNTllYjE1OGItM2YwNy00Y2VlLWI4NTAtM2VmZmRlYTYzZmJiIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE2LjUuOS4zIiwiVHJ1c3RlZExhYmVsSGFzaCI6IjFIRVU4WForbVlCdGhzckxYQmlnaUJHRXRtaDV2RGxhWXZudmMwK2RCdms9In0= x-ctpclassification: CTP_IC dlp-product: dlpe-windows dlp-version: 10.0.102.7 dlp-reaction: no-action x-originating-ip: [163.33.239.180] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 17:14:34 -0000 Hi all, Just read the rfcdiff between -12 and -13 and this was the first time I saw= new TTL field (I don't actively follow the mailing list). Isn't the Service Index field being implicitly/in practice limited to the T= TL field? Let me explain my reasoning: TTL seems to be implicitly limiting SI to 63 because between each SF there = will be at least 1 SFF, and each SFF will decrement TTL before checking the= mapping table. So we can't have 255 SF hops without also having at least ~= 255 SFF hops (potentially many more depending on the topology of SFFs). Thank you, Best regards, Igor. -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Joel Halpern Sent: Monday, July 3, 2017 1:14 AM To: sfc@ietf.org Subject: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt Below is the announcement of -13 of the NSH document. To the best of the chairs and editors ability, this reflects all comments w= e have received, in accordance with the rough consensus of the WG as best t= he chairs were able to determine it. We think it is done. Please take a look. Our goal is to hand this document to the IESG by the IETF meeting. As such= , we would like all comments to be in by 14-July-2017. Yours, Joel and Jim PS: Unless someone objects, we will accept the OAM clarification Andy Malis= sent to the list. -------- Forwarded Message -------- Subject: I-D Action: draft-ietf-sfc-nsh-13.txt Date: Fri, 30 Jun 2017 04:33:38 -0700 From: internet-drafts@ietf.org Reply-To: internet-drafts@ietf.org To: i-d-announce@ietf.org CC: sfc@ietf.org A New Internet-Draft is available from the on-line Internet-Drafts=20 directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Network Service Header Authors : Paul Quinn Uri Elzur Filename : draft-ietf-sfc-nsh-13.txt Pages : 37 Date : 2017-06-30 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service path. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) Architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-13 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-13 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sfc-nsh-13 Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Jul 4 10:18:15 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 47908131538 for ; Tue, 4 Jul 2017 10:18:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ky1cTkXrd96z for ; Tue, 4 Jul 2017 10:18:10 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 430E11324F4 for ; Tue, 4 Jul 2017 10:17:42 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 2624B2510A6; Tue, 4 Jul 2017 10:17:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1499188662; bh=JZoYgk1Lv/kTbRIrxmsRUUd5E/2chJ28MaLQLWhE8P0=; h=Subject:To:References:From:Date:In-Reply-To:From; b=nqFRE99v1mWwEbKIidmt1SDJU9bCWs0IA1JqPMuK9p8j7i1SrwWmiNXkX40WdkFOV VyMFQwBW/gndaahtB9AjnzJkueLdJjaBUULwk086Ixrorpryj/MQpZ2If72Zy0tOnF beJTmdH4WxuFQOieLgdDrvFHxolrTNczGbkr275I= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 834AA240562; Tue, 4 Jul 2017 10:17:41 -0700 (PDT) To: "Duarte Cardoso, Igor" , "sfc@ietf.org" References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> From: "Joel M. Halpern" Message-ID: Date: Tue, 4 Jul 2017 13:17:40 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 17:18:12 -0000 Yes, in theory we could have reduced the size of the SI field without loss of functionality. As I see it, there seemed no point. Yours, Joel On 7/4/17 1:14 PM, Duarte Cardoso, Igor wrote: > Hi all, > > Just read the rfcdiff between -12 and -13 and this was the first time I saw new TTL field (I don't actively follow the mailing list). > > Isn't the Service Index field being implicitly/in practice limited to the TTL field? > > Let me explain my reasoning: > TTL seems to be implicitly limiting SI to 63 because between each SF there will be at least 1 SFF, and each SFF will decrement TTL before checking the mapping table. So we can't have 255 SF hops without also having at least ~255 SFF hops (potentially many more depending on the topology of SFFs). > > Thank you, > Best regards, > Igor. > > -----Original Message----- > From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Joel Halpern > Sent: Monday, July 3, 2017 1:14 AM > To: sfc@ietf.org > Subject: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt > > Below is the announcement of -13 of the NSH document. > To the best of the chairs and editors ability, this reflects all comments we have received, in accordance with the rough consensus of the WG as best the chairs were able to determine it. > > We think it is done. > Please take a look. > > Our goal is to hand this document to the IESG by the IETF meeting. As such, we would like all comments to be in by 14-July-2017. > > Yours, > Joel and Jim > > PS: Unless someone objects, we will accept the OAM clarification Andy Malis sent to the list. > > > -------- Forwarded Message -------- > Subject: I-D Action: draft-ietf-sfc-nsh-13.txt > Date: Fri, 30 Jun 2017 04:33:38 -0700 > From: internet-drafts@ietf.org > Reply-To: internet-drafts@ietf.org > To: i-d-announce@ietf.org > CC: sfc@ietf.org > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Service Function Chaining of the IETF. > > Title : Network Service Header > Authors : Paul Quinn > Uri Elzur > Filename : draft-ietf-sfc-nsh-13.txt > Pages : 37 > Date : 2017-06-30 > > Abstract: > This document describes a Network Service Header (NSH) inserted onto > packets or frames to realize service function paths. NSH also > provides a mechanism for metadata exchange along the instantiated > service path. NSH is the SFC encapsulation required to support the > Service Function Chaining (SFC) Architecture (defined in RFC7665). > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-sfc-nsh-13 > https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-13 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-13 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Tue Jul 4 15:06:31 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B9D3C12F28B for ; Tue, 4 Jul 2017 15:06:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v2V7dTtBOFY8 for ; Tue, 4 Jul 2017 15:06:28 -0700 (PDT) Received: from mail-qk0-x22b.google.com (mail-qk0-x22b.google.com [IPv6:2607:f8b0:400d:c09::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1316112F27D for ; Tue, 4 Jul 2017 15:06:28 -0700 (PDT) Received: by mail-qk0-x22b.google.com with SMTP id v143so92795487qkb.0 for ; Tue, 04 Jul 2017 15:06:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=I5XxyZuaHWFVPM65sRuPHfQzbtvKDcfLxvkg8yDf0ic=; b=J9r62rIOn1+sfX+lSto0sgD8Z6yppotpKu5Oe63WRFNdbyudSxOoPZGQDse39rkEnq gwU5Z5TUOoEjLBadLKo3Hk4jvQwG18RhTnrN/sHuaBtV4zljcWPNdBp9LugY3ohE4Ruk cVqdAjgeQaAsq6nv599K8kMwnrSaexGJ0LUCeY5GcLtFPLlNUm2/g5/xv47M13shzTR3 K5ZT2HsHHAexkabNq9drwA5CMN1qWwmw581quVBta553M3wHKrGhurnqIGba2oYG/7t2 9wxnB6OcayLyiN0d5cVhf9+YmBquCHh0fEAExG6OtIsyXygvthX6tVhuHRqXU0bs4rKO IEzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=I5XxyZuaHWFVPM65sRuPHfQzbtvKDcfLxvkg8yDf0ic=; b=pifXf7o3v3zRDpcamNe32UAmjoWvrspxCALAG0jkYdGZqj/8H15tQ5CJsKSmjgmgep 9LB8qbjet7jmfolFQOsmZylfUrAQ29QvSzdNSCaGqrIwqqCtNGrT6iz4/yHZ8se269IG PfmFEwc4vN0W89pB1xuJO15vzeIxpoUPO228JiV79Vt39NrKhpqHuktbWufKtLfGykS8 U0YjxSpKxokBVZj7KReEfR8hxglhWwlSnveaVdibV+8jFD8DnjFJ1+NRKEVvP9aKtPc0 fET1s2SKld5/wFH/ZV42E/zl3zAsQyJadyWxfLCyxfjNgNiBkKZH6SbRH0SrehEu/nqS gFAQ== X-Gm-Message-State: AKS2vOyENqV6PsP4GCt+rHXJ+2of2oz/N9vNXbvgAp/UuwDscCGynvUG NAhyobQAUbDXhwp4B0QDk5ZocpV+jw== X-Received: by 10.55.39.194 with SMTP id n185mr51478908qkn.139.1499205987039; Tue, 04 Jul 2017 15:06:27 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Tue, 4 Jul 2017 15:06:26 -0700 (PDT) In-Reply-To: References: <149885200412.4686.625724536330402017@ietfa.amsl.com> From: Greg Mirsky Date: Tue, 4 Jul 2017 15:06:26 -0700 Message-ID: To: Dave Dolson Cc: "sfc@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c092da04d7ebe05538518ce" Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-hierarchical-03.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jul 2017 22:06:30 -0000 --94eb2c092da04d7ebe05538518ce Content-Type: text/plain; charset="UTF-8" Hi Dave, Authors, thank you for very interesting approach to the problem of SFC complexity. Great well-written document. Please kindly consider my comments, questions: - even though the draft is targeted for Informational track, I'd encourage include wording from RFC 8174 that clarifies use of normative words: Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119 ] [RFC8174 ] when, and only when, they appear in all capitals, as shown here. - I think that adding section with acronyms listed will be helpful to the reader. - Is "stickiness to specific SF instances" another way to say that SF is stateful? And the same question for types of SFs that require bidirectional traffic (I think that such requirement implies what later referred as stickiness, i.e. reverse direction must cross the same SF instance as the forward direction of SFC). - I'm not sure that assumption in Section 2.2 regarding encapsulation of the packets entering lower-level SFC domain. What you see as the transport between SFF of the higher-level and IBN? - section 3.1.1 refers to IBN as"terminator of lower-level chain". As I understand, IBN is the representation, proxy of the lower-level chain in the higher-level. Right? If my understanding is correct, some terminology alignment may be helpful. - Figure 3. What is seen as overlay encapsulation? I'd probably refer to the outer header as Transport or Underlay without going into gory details of what it is. But more importantly, in my view, is to clarify where, at which point in hSFC, hSFC packet has format presented in Fig.3. I'd imagine that lower-NSH is to be added by the Classifier of the sub-domain. But would SFF that being handed the resulting packet have the Transport Header to deal with? - I think that sections 3.3 and 3.4 are related as there's some duplication between SI and TTL that was pointed on the NSH thread by Igor. Thus policies that regulate handling of SI and TTL may need to be synchronized or coordinated to have predictable behavior. - I think that section 3.4 may benefit from using RFC 3443 terminology in regard to TTL handling between inner and outer headers and refer to Unified, Short Pipe, and Pipe. - does the first paragraph in section 4 refer to IBN removing higher-level NSH? I thought that is one possible solution and other solutions may rely on information in the higher-level NSH being available to the sub-domain Classifier. - there's another term very close to bidirectional symmetry as defined in section 4 - co-routed path. Co-routed path is bidirectional path that traverses the same set of links and nodes in forward and reverse directions and is viewed as single entity, e.g. failure in one direction viewed as bi-directional failure. May be co-routed path be used as reference or as term in (h)SFC . Regards, Greg On Fri, Jun 30, 2017 at 1:02 PM, Dave Dolson wrote: > SFC WG, > > This new version hopefully addresses some of the comments received on the > list. > It also uses the new NSH header format, with some language about handling > the TTL in the sub-domains. > (I've written that whether to expose the hops of the sub-domain is > administrator choice.) > > Hopefully my changes are acceptable to the working group. > I'm more than happy to discuss this with anyone. > > I think the main outstanding issue is whether we should reduce the number > of options in sections 3.1.1 thru 3.1.5 be reduced? > On one hand, the start and end of sub-domain chains are within the purview > of a single vendor. > On the other hand, 5 options is too many. > > See you in Prague, > -Dave > > > -----Original Message----- > From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of > internet-drafts@ietf.org > Sent: Friday, June 30, 2017 3:47 PM > To: i-d-announce@ietf.org > Cc: sfc@ietf.org > Subject: [sfc] I-D Action: draft-ietf-sfc-hierarchical-03.txt > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Service Function Chaining of the IETF. > > Title : Hierarchical Service Function Chaining (hSFC) > Authors : David Dolson > Shunsuke Homma > Diego R. Lopez > Mohamed Boucadair > Dapeng Liu > Ting Ao > Vu Anh Vu > Filename : draft-ietf-sfc-hierarchical-03.txt > Pages : 26 > Date : 2017-06-30 > > Abstract: > Hierarchical Service Function Chaining (hSFC) is a network > architecture allowing an organization to decompose a large-scale > network into multiple domains of administration. > > The goals of hSFC are to make a large-scale network easier to reason > about, simpler to control and to support independent functional > groups within large network operators. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-sfc-hierarchical/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-sfc-hierarchical-03 > https://datatracker.ietf.org/doc/html/draft-ietf-sfc-hierarchical-03 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-hierarchical-03 > > > Please note that it may take a couple of minutes from the time of > submission until the htmlized version and diff are available at > tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --94eb2c092da04d7ebe05538518ce Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Dave, Authors,
thank you for very interesting appro= ach to the problem of SFC complexity. Great well-written document. Please k= indly consider my comments, questions:
  • even though the dr= aft is targeted for Informational track, I'd encourage include wording = from RFC 8174 that clarifies use of normative words:
Requirements Language


   The key words "MUST", "MUST NOT", "REQUIRED&quo=
t;, "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", &qu=
ot;NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described=
 in BCP
   14 [=
RFC21=
19] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.
  • I th=
ink that adding section with acronyms listed will be helpful to the reader.=

  • Is "stickiness to specif=
ic SF instances" another way to say that SF is stateful? And the same =
question for types of SFs that require bidirectional traffic (I think that =
such requirement implies what later referred as stickiness, i.e. reverse di=
rection must cross the same SF instance as the forward direction of SFC).
  • I'm not sure that assumptio=
n in Section 2.2 regarding encapsulation of the packets entering lower-leve=
l SFC domain. What you see as the transport between SFF of the higher-level=
 and IBN?
  • section 3.1.1 refers=
 to IBN as"terminator of lower-level chain". As I understand, IBN=
 is the representation, proxy of the lower-level chain in the higher-level.=
 Right? If my understanding is correct, some terminology alignment may be h=
elpful.
  • F=
igure 3. What is seen as overlay encapsulation? I'd probably refer to t=
he outer header as Transport or Underlay without going into gory details of=
 what it is. But more importantly, in my view, is to clarify where, at whic=
h point in hSFC, hSFC packet has format presented in Fig.3. I'd imagine=
 that lower-NSH is to be added by the Classifier of the sub-domain. But wou=
ld SFF that being handed the resulting packet have the Transport Header to =
deal with?
  • I thi=
nk that sections 3.3 and 3.4 are related as there's some duplication be=
tween SI and TTL that was pointed on the NSH thread by Igor. Thus policies =
that regulate handling of SI and TTL may need to be synchronized or coordin=
ated to have predictable behavior.
  • I =
think that section 3.4 may benefit from using RFC 3443 terminology in regar=
d to TTL handling between inner and outer headers and refer to Unified, Sho=
rt Pipe, and Pipe.
  • does the fi=
rst paragraph in section 4 refer to IBN removing higher-level NSH? I though=
t that is one possible solution and other solutions may rely on information=
 in the higher-level NSH being available to the sub-domain Classifier.
  • there's another term very clos=
e to bidirectional symmetry as defined in section 4 - co-routed path. Co-ro=
uted path is bidirectional path that traverses the same set of links and no=
des in forward and reverse directions and is viewed as single entity, e.g. =
failure in one direction viewed as bi-directional failure. May be co-routed=
 path be used as reference or as term in (h)SFC .
Regards,
Greg

On Fri, Jun 30, 2017 at 1:02 PM, Dave Dolson <dd= olson@sandvine.com> wrote:
= SFC WG,

This new version hopefully addresses some of the comments received on the l= ist.
It also uses the new NSH header format, with some language about handling t= he TTL in the sub-domains.
(I've written that whether to expose the hops of the sub-domain is admi= nistrator choice.)

Hopefully my changes are acceptable to the working group.
I'm more than happy to discuss this with anyone.

I think the main outstanding issue is whether we should reduce the number o= f options in sections 3.1.1 thru 3.1.5 be reduced?
On one hand, the start and end of sub-domain chains are within the purview = of a single vendor.
On the other hand, 5 options is too many.

See you in Prague,
-Dave


-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.= org] On Behalf Of internet-= drafts@ietf.org
Sent: Friday, June 30, 2017 3:47 PM
To: i-d-announce@ietf.org
Cc: sfc@ietf.org
Subject: [sfc] I-D Action: draft-ietf-sfc-hierarchical-03.txt


A New Internet-Draft is available from the on-line Internet-Drafts director= ies.
This draft is a work item of the Service Function Chaining of the IETF.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= Hierarchical Service Function Chaining (hSFC)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Davi= d Dolson
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Shunsuke Homma
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Diego R. Lopez
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Mohamed Boucadair
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Dapeng Liu
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Ting Ao
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Vu Anh Vu
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet= f-sfc-hierarchical-03.txt
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= 26
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 := 2017-06-30

Abstract:
=C2=A0 =C2=A0Hierarchical Service Function Chaining (hSFC) is a network
=C2=A0 =C2=A0architecture allowing an organization to decompose a large-sca= le
=C2=A0 =C2=A0network into multiple domains of administration.

=C2=A0 =C2=A0The goals of hSFC are to make a large-scale network easier to = reason
=C2=A0 =C2=A0about, simpler to control and to support independent functiona= l
=C2=A0 =C2=A0groups within large network operators.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/d= raft-ietf-sfc-hierarchical/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ie= tf-sfc-hierarchical-03
https://datatracker.ietf.org/doc/html/draft-ietf-sfc-hierarchical-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?= url2=3Ddraft-ietf-sfc-hierarchical-03


Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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https://www.ietf.org/mailman/listinfo/sfc

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--94eb2c092da04d7ebe05538518ce-- From nobody Wed Jul 5 02:30:32 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C5BA131B88 for ; Wed, 5 Jul 2017 02:30:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IhD9R5x_Rv3a for ; Wed, 5 Jul 2017 02:30:27 -0700 (PDT) Received: from relais-inet.orange.com (mta134.mail.business.static.orange.com [80.12.70.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFC2C131B70 for ; Wed, 5 Jul 2017 02:30:26 -0700 (PDT) Received: from opfednr01.francetelecom.fr (unknown [xx.xx.xx.65]) by opfednr24.francetelecom.fr (ESMTP service) with ESMTP id 245F3406A1; Wed, 5 Jul 2017 11:30:25 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.24]) by opfednr01.francetelecom.fr (ESMTP service) with ESMTP id E81C91A007A; Wed, 5 Jul 2017 11:30:24 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM7D.corporate.adroot.infra.ftgroup ([fe80::9044:c5ee:4dd2:4f16%19]) with mapi id 14.03.0352.000; Wed, 5 Jul 2017 11:30:24 +0200 From: To: Joel Halpern , "sfc@ietf.org" Thread-Topic: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt Thread-Index: AQHS85FGloW5YmKVhU6k519KVy5LL6JE6/xg Date: Wed, 5 Jul 2017 09:30:24 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> In-Reply-To: <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.3] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Jul 2017 09:30:31 -0000 Hi Joel, all,=20 The document is almost stable. Below my review of the version: Major:=20 (1) Indicate that the spec does not assume nor preclude the MD type can cha= nged on path. For example, this can be added as follows: NEW: NSH implementations MUST support MD type =3D 0x1 and MD Type 0x2 (where the length is of value 0x2). NSH implementations SHOULD support MD Type 0x2 with length > 0x2. There exists, however, a middle ground, wherein a device will support MD Type 0x1 (as per the MUST) metadata, yet be deployed in a network with MD Type 0x2 metadata packets. In that case, the MD Type 0x1 node, MUST utilize the base header length field to determine the original payload offset if it requires access to the original packet/frame.=20 OLD: NSH implementations MUST support MD type 0x1 and MD Type 0x2 (where the length is of value 0x2). NSH implementations SHOULD support MD Type 0x2 with length > 0x2. There exists, however, a middle ground, wherein a device will support MD Type 0x1 (as per the MUST) metadata, yet be deployed in a network with MD Type 0x2 metadata packets. In that case, the MD Type 0x1 node, MUST utilize the base header length field to determine the original payload offset if it requires access to the original packet/frame. This specification does not assume nor ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ preclude that the same MD Type is maintained or changed along ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^=20 a service path; it is deployment-specific. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (2) The IANA section is not aligned with the core text with regards to assi= gned MD type values: OLD: This document defines two MD Type values: 0x1 - which indicates that the format of the header includes a fixed length Context Header (see Figure 4 below). 0x2 - which does not mandate any headers beyond the Base Header and Service Path Header, but may contain optional variable length Context Header(s). The semantics of the variable length Context Header(s) are not defined in this document The text should be updated to refer to these experimental values: 15 (Exper= iment 1) and 16 (Experiment 2). Some words about the usage of those values would be appropriate, too.=20 (3) The IANA section is not aligned with the core text with regards to assi= gned Next Protocol values: OLD:=20 This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS NEW:=20 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 Further, the document does not include some text about the use of 254/255 v= alues. =20 (4) The document states the following: OLD: 12.1. NSH EtherType An IEEE EtherType, 0x894F, has been allocated for NSH. But no entry is found at https://www.iana.org/assignments/ieee-802-numbers/= ieee-802-numbers.xhtml!=20 Unless I'm mistaken, an action is needed form IANA. Thus, I suggest the fol= lowing NEW text:=20 NEW:=20 12.1. NSH EtherType IANA is requested to register the IEEE EtherType, 0x894F, for NSH in htt= ps://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml. =3D=3D Minor:=20 =3D=3D * Title: I suggest this modification OLD: Network Service Header=20 NEW: Network Service Header (NSH) * Abstract:=20 OLD:=20 This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service path. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) Architecture (defined in RFC7665). NEW: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the ^^ Service Function Chaining (SFC) architecture (defined in RFC7665). ^^ * Introduction: (1) OLD:=20 Service functions are widely deployed and essential in many networks. These service functions provide a range of features such as security, WAN acceleration, and server load balancing. Service functions may be instantiated at different points in the network infrastructure such as the wide area network, data center, campus, and so forth. NEW: Service functions are widely deployed and essential in many networks. These service functions provide a range of features such as security, WAN (Wide Area Network) acceleration (REF), and server load balancing. = Service functions may be instantiated at different points in the network infrastructure such as the wide area network [I-D.ietf-sfc-use-case-mobility],=20 data center [I-D.ietf-sfc-dc-use-cases], campus, and so forth. - expand an acronym - cite the use case drafts to illustrate the use of SFs - Given that WAN acceleration may not be that clear, citing a reference whe= re this is defined will be helpful. (2) Expand an acronym on first use:=20 OLD: NSH defines a new service plane protocol specifically for the creation of dynamic service chains and is composed of the following elements: 1. Service Function Path identification NEW: Network Service Header (NSH) defines a new service plane protocol specif= ically for the ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creation of dynamic service chains and is composed of the following elements: 1. Service Function Path identification. ^^ * Section 2.1 (1) OLD: Network Locator: dataplane address, typically IPv4 or IPv6, used to send and receive network traffic. NEW: Network Locator: dataplane address, typically IPv4 or IPv6, used to send and receive traffic. - Not sure what is meant by "network traffic" (2) OLD: Network Node/Element: Device that forwards packets or frames based on outer header (i.e. transport) information. NEW: Network Node/Element: Device that forwards packets or frames based on the outer header (i.e., transport) information. ^^^^ ^^=20 (3)=20 OLD:=20 Network Overlay: Logical network built on top of existing network (the underlay). Packets are encapsulated or tunneled to create ^^^^^^^^^^^^ the overlay network topology. NEW:=20 Network Overlay: Logical network built on top of existing network (the underlay). Packets are encapsulated to create the overlay network topology. (4) Position the "Service Classifier" entry right after SFP given that the text= uses SFs and SFFs acronyms that are introduced later in the section.=20 * Section 2.2: NSH is already expanded.=20 OLD: Network Service Header (NSH) addresses several limitations associated with service function deployments. =20 NEW: NSH addresses several limitations associated with service function deployments. =20 * Section 2.3: Transport area folks may be "hurted" by this "network transp= ort protocol" wording. I suggest to use transport encapsulation as per the = SFC arch RFC. OLD:=20 5. Transport Agnostic: NSH is transport independent. An appropriate (for a given deployment) network transport protocol can be used to transport NSH-encapsulated traffic. This transport may form an overlay network and if an existing overlay topology provides the required service path connectivity, that existing overlay may be used. NEW: 5. Transport Agnostic: NSH is transport-independent. An appropriate ^^^^^^ =20 (for a given deployment) network transport encapsulation scheme can = be used ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ to transport NSH-encapsulated traffic. This transport may form an overlay network and if an existing overlay topology provides the required service path connectivity, that existing overlay may be used. * Section 3: (1) OLD: A Network Service Header (NSH) contains service path information and ^^^^^^^^^^^^^^^^^^^^^^^^ optionally metadata that are added to a packet or frame and used to create a service plane. An outer transport header is imposed, on NSH^ ^^^^^^ and the original packet/frame, for network forwarding. ^ NEW: NSH contains service path information and optionally metadata that are added to a packet or frame and used to create a service path. An outer transport header is imposed, on NSH and the original packet/frame, for network forwarding. (2) OLD: A Service Classifier adds NSH. NSH is removed by the last SFF in the service chain or by a SF that consumes the packet. NEW: A Service Classifier adds NSH. NSH is removed by the last SFF in the service chain or by an SF that consumes the packet. ^^ * Section 3.1 (1) OLD:=20 Service Path Header: provide path identification and location within a service path. NEW: Service Path Header: provides path identification and location within ^^^^^^^^ a service path. (2) OLD: Context header: carry metadata (i.e. context data) along a service path. NEW: Context header: carries metadata (a.k.a., context data) along a service ^^^^^^^^ ^^^^^^^^=20 path. * Section 3.2. (1) Add this text before Figure 2 NEW: Figure 2 depicts the NSH base header: (2) OLD: Version: The version field is used to ensure backward compatibility going forward with future NSH updates. It MUST be set to 0x0 by the sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. NEW: Version: The version field is used to ensure backward compatibility going forward with future NSH specification updates. It MUST be set to = 0x0 by the ^^^^^^^^^^^^^^^^^^=20 sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. (3) OLD: SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM NEW: SF/SFF/SFC Proxy/Classifier implementations that do not support SFC ^^^^^^^^^^ OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM (4) OLD: All other flag fields are reserved for future use. Reserved bits MUST be set to zero upon origination and MUST be preserved unmodified by other NSH supporting elements. Elements which do not understand the meaning of any of these bits MUST not modify their actions based on those unknown bits. NEW: All other flag fields are reserved for future use. Reserved bits MUST be set to zero upon origination and MUST be preserved unmodified by other NSH supporting elements. Elements which do not understand the meaning of any of these bits MUST NOT modify their actions based ^^^^ on those unknown bits. (5) OLD:=20 0x1 - which indicates that the format of the header includes a fixed length Context Header (see Figure 4 below). NEW: 0x1 - which indicates that the format of the header includes a fixed length Context Header (see Figure 4). (6) OLD: 0x2 - which does not mandate any headers beyond the Base Header and Service Path Header, but may contain optional variable length Context Header(s). The semantics of the variable length Context Header(s) are not defined in this document NEW: 0x2 - which does not mandate any headers beyond the Base Header and Service Path Header, but may contain optional variable length Context Header(s). The semantics of the variable length Context Header(s) are not defined in this document.=20 ^^ A generic format of the variable length Context Header is provided in Se= ction 3.5.1. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^= ^^^^^^^^^^^^ (7) OLD: NSH implementations MUST support MD type =3D 0x1 and MD Type 0x2 (where the length is of value 0x2). =20 NEW1: NSH implementations MUST support MD type 0x1 and MD Type 0x2 (where the length is of value 0x2). =20 Or=20 NEW2: NSH implementations MUST support MD type =3D 0x1 and MD Type =3D 0x2 (wh= ere the length is of value 0x2). =20 (8) OLD: Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see IANA Considerations section below. NEW: Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see IANA Considerations (Section 12.2.5). * Section 3.3: (1) Add this new text right before Figure 3:=20 NEW: Figure 3 shows the format of the Service Path Header: (2) Add this NEW text right after Figure 3: NEW: The meaning of these fields is as follows: (3) OLD: SI is used in conjunction with Service Path Identifier for Service Function Path Selection and for determining the next SFF/SF in the path. Service Index (SI) is also valuable when troubleshooting/ ^^^^^^^^^^^^^^^^^^^ =20 reporting service paths. In addition to indicating the location within a Service Function Path, SI can be used for service plane loop detection. NEW: SI is used in conjunction with Service Path Identifier for Service Function Path Selection and for determining the next SFF/SF in the path. SI is also valuable when troubleshooting/ reporting service paths. In addition to indicating the location within a Service Function Path, SI can be used for service plane loop detection. * Section 3.4: OLD:=20 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Ver|O|R| TTL | Length |R|R|R|R|MD Type| Next Protocol | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Service Path Identifer | Service Index | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | Fixed Length Context Header | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ NEW: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Ver|O|R| TTL | Length |R|R|R|R|MD Type| Next Protocol | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Service Path Identifier | Service Index | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | Fixed Length Context Header | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * Section 3.5: Figure 5 is not called in the text.=20 OLD: When the base header specifies MD Type=3D 0x2, zero or more Variable Length Context Headers MAY be added, immediately following the Service Path Header. =20 NEW: When the base header specifies MD Type=3D 0x2, zero or more Variable Length Context Headers MAY be added, immediately following the Service Path Header (Figure 5). =20 * Section 3.5.1:=20 (1) OLD: Metadata Class (MD Class): The MD Class defines the scope of the 'Type' field to provide a hierarchical namespace. The IANA Considerations section defines how the MD Class values can be allocated to standards bodies, vendors, and others. NEW: Metadata Class (MD Class): defines the scope of the 'Type' field to provide a hierarchical namespace. Section 12.2.4 define= s how the MD Class values can be allocated to standards bodies, vendors, and others. (2) OLD: Length: Length of the variable metadata, in single byte words. =20 NEW: Length: indicates the length of the variable metadata, in single byte wo= rds. =20 * Section 4 (1) OLD: These nodes have several possible header related actions: NEW: These nodes have several possible NSH-related actions: (2)=20 (1) OLD: 1. Insert or remove NSH: These actions can occur at the start and NEW: 1. Insert or remove NSH: can occur at the start and (2) a classifier is a function, so "logical classifier" sounds weird to me. OLD:=20 Multiple logical classifiers may exist within a given service path. =20 NEW: Multiple classifiers may exist within a given service path. =20 * Section 5: Not sure I would maintain this section. At least, the title sh= ould be updated to reflect the few points that are cited. =20 OLD: 5. NSH Encapsulations NEW: 5. NSH & Transport Encapsulations * Section 7.1 (1) OLD:=20 As described above, NSH contains a Service Path Identifier (SPI) and ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ a Service Index (SI). The SPI is, as per its name, an identifier.^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The SPI alone cannot be used to forward packets along a service path. Rather the SPI provide a level of indirection between the service path/topology and the network transport. Furthermore, there is no^ ^^^^^^^^^^^^ requirement, or expectation of an SPI being bound to a pre-determined or static network path. NEW: The SPI alone cannot be used to forward packets along a service path. Rather the SPI provides a level of indirection between the service ^^^^^^^^ path and the network transport. Furthermore, there is no requirement, or expectation of an SPI being bound to a pre-determined or static network path. (2) Use consistent terminology: OLD:=20 This indirection --- path ID to overlay -- creates a true service ^^^^^^^^ plane. NEW: This indirection --- SPI to overlay -- creates a true service plane. =20 * Section 9: Add this NEW text at the end of the 4th paragraph: NEW: Means to prevent leaking privacy-related information outside an administrat= ive domain are supported by NSH given that the last SFF of a path will syst= ematically remove the NSH header before forwarding a packet upstream. Cheers, Med > -----Message d'origine----- > De=A0: sfc [mailto:sfc-bounces@ietf.org] De la part de Joel Halpern > Envoy=E9=A0: lundi 3 juillet 2017 02:14 > =C0=A0: sfc@ietf.org > Objet=A0: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-13.txt >=20 > Below is the announcement of -13 of the NSH document. > To the best of the chairs and editors ability, this reflects all > comments we have received, in accordance with the rough consensus of the > WG as best the chairs were able to determine it. >=20 > We think it is done. > Please take a look. >=20 > Our goal is to hand this document to the IESG by the IETF meeting. As > such, we would like all comments to be in by 14-July-2017. >=20 > Yours, > Joel and Jim >=20 > PS: Unless someone objects, we will accept the OAM clarification Andy > Malis sent to the list. >=20 >=20 > -------- Forwarded Message -------- > Subject: I-D Action: draft-ietf-sfc-nsh-13.txt > Date: Fri, 30 Jun 2017 04:33:38 -0700 > From: internet-drafts@ietf.org > Reply-To: internet-drafts@ietf.org > To: i-d-announce@ietf.org > CC: sfc@ietf.org >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Service Function Chaining of the IETF. >=20 > Title : Network Service Header > Authors : Paul Quinn > Uri Elzur > Filename : draft-ietf-sfc-nsh-13.txt > Pages : 37 > Date : 2017-06-30 >=20 > Abstract: > This document describes a Network Service Header (NSH) inserted onto > packets or frames to realize service function paths. NSH also > provides a mechanism for metadata exchange along the instantiated > service path. NSH is the SFC encapsulation required to support the > Service Function Chaining (SFC) Architecture (defined in RFC7665). >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-sfc-nsh-13 > https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-13 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sfc-nsh-13 >=20 >=20 > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >=20 > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc From nobody Wed Jul 5 08:45:19 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 663AC13193F for ; Wed, 5 Jul 2017 08:45:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ae9ahkybsqcC for ; Wed, 5 Jul 2017 08:45:14 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA07E13193E for ; Wed, 5 Jul 2017 08:45:12 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DQM07336; Wed, 05 Jul 2017 15:45:10 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.301.0; Wed, 5 Jul 2017 16:45:09 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.142]) by SJCEML703-CHM.china.huawei.com ([169.254.5.136]) with mapi id 14.03.0301.000; Wed, 5 Jul 2017 08:45:03 -0700 From: James N Guichard To: Greg Mirsky , "Carlos Pignataro (cpignata)" CC: "Joel M. 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Malis" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAO5uEAAACtAYAAAAstAABczdEAAAF39IAAAWzuAAAAUc+AAACI8QAAaz5ZgAAKm0qAADihxUA= Date: Wed, 5 Jul 2017 15:45:03 +0000 Message-ID: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.148.254] Content-Type: multipart/alternative; boundary="_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EE5AFASJCEML702CHMchina_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090202.595D0987.0050, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.142, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 456f9047e3fdab240fcd45227cd18343 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Jul 2017 15:45:17 -0000 --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EE5AFASJCEML702CHMchina_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgR3JlZy9DYXJsb3MsDQoNCkl0IGlzIGRpZmZpY3VsdCB0byB0ZWxsIGZyb20gdGhpcyB0aHJl YWQgd2hldGhlciBhIHRleHR1YWwgY2hhbmdlIGlzIGJlaW5nIHByb3Bvc2VkIG9yIGlmIHRoZSBj dXJyZW50IHRleHQgaXMgc3VmZmljaWVudDsgcGxlYXNlIGNhbiB5b3UgY2xhcmlmeSBmb3IgdGhl IFdHIGFuZCBpZiBhIHRleHR1YWwgY2hhbmdlIGlzIGJlaW5nIHByb3Bvc2VkIHBsZWFzZSBjbGVh cmx5IHN0YXRlIHdoYXQgdGhpcyBpcyBzbyB0aGF0IHRoZSBXRyBjYW4gZXZhbHVhdGUgYW5kIHdl 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aHRtbD4NCg== --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EE5AFASJCEML702CHMchina_-- From nobody Wed Jul 5 12:47:39 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF8EC131765 for ; Wed, 5 Jul 2017 12:47:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pFwj3qwMVq-8 for ; Wed, 5 Jul 2017 12:47:34 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 403E6131569 for ; Wed, 5 Jul 2017 12:47:34 -0700 (PDT) Received: from WTL-EXCHP-1.sandvine.com ([fe80::ac6b:cc1e:f2ff:93aa]) by WTL-EXCHP-3.sandvine.com ([fe80::3c39:d305:d721:f00a%15]) with mapi id 14.03.0319.002; Wed, 5 Jul 2017 15:47:33 -0400 From: Dave Dolson To: Greg Mirsky CC: "sfc@ietf.org" Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-hierarchical-03.txt Thread-Index: AQHS8dmfO1KmvJj0skyALfG07n/WaaI90DGAgAayuQCAAQ/SgA== Date: Wed, 5 Jul 2017 19:47:32 +0000 Message-ID: References: <149885200412.4686.625724536330402017@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.200.114] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_E8355113905631478EFF04F5AA706E9870632A79wtlexchp1sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-hierarchical-03.txt X-BeenThere: sfc@ietf.org 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draft-ietf-sfc-hierarchical-03.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2017 06:46:42 -0000 --_000_787AE7BB302AE849A7480A190F8B93300A0016D5OPEXCLILMA3corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgR3JlZywgRGF2ZSwNCg0KUGxlYXNlIHNlZSBpbmxpbmUuDQoNCkNoZWVycywNCk1lZA0KDQpE ZSA6IHNmYyBbbWFpbHRvOnNmYy1ib3VuY2VzQGlldGYub3JnXSBEZSBsYSBwYXJ0IGRlIERhdmUg RG9sc29uDQpFbnZvecOpIDogbWVyY3JlZGkgNSBqdWlsbGV0IDIwMTcgMjE6NDgNCsOAIDogR3Jl ZyBNaXJza3kNCkNjIDogc2ZjQGlldGYub3JnDQpPYmpldCA6IFJlOiBbc2ZjXSBJLUQgQWN0aW9u OiBkcmFmdC1pZXRmLXNmYy1oaWVyYXJjaGljYWwtMDMudHh0DQoNCkdyZWcsDQpUaGFuayB5b3Ug Zm9yIGdpdmluZyB5b3VyIHRpbWUgdG8gcmVhZGluZyBhbmQgcHJvdmlkaW5nIGNvbW1lbnRzLg0K DQpTZWUgaW5saW5lIFtERF0uDQoNCi1EYXZlDQoNCg0KRnJvbTogR3JlZyBNaXJza3kgW21haWx0 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bh=llpfKexnVSTJ3wXfBPQl2z2NxE7gsbkc/EsfffCOaJE=; b=i1BxyoVnBkER89ux658cOnxI/tihW7T1er0Xmtz66s1f40eHK/iuW7kS3+4lSxK+LC cP5AbXePcq7/99V7NZxyCIkySTR+GH+TKXlftvRSShBiIHGEInAbY4txzmNOA7HNFa+9 Hw76yxyskL56trU1bExtGwpsLXvCrscrBXPpVrWs42JPWnh5uCpTVg0wls5nKf8B2Zvy udtrULG7fRW1gkVGZU4eF3S41g89tWJNo58U7r/zhEsuXqIHF3NgylnwALkUjV9IuDJw R0fV1b5phlIsJtCrye3bdX8csYZYS71Qa088KQWo2YlVLrvmTLDSLuOaTojoHSv9j73d 4amw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=llpfKexnVSTJ3wXfBPQl2z2NxE7gsbkc/EsfffCOaJE=; b=Ha+VxvZ/ITYKBs97MhEFXIQlg2ClYYMCDWxefqFJMa0EG0prmB6y2wjICck8unAfiP Yw6B3XwYbC31TFCs6bcTeFpVAQta8o01P94PVVkP9ldsP09BxRLEhX4hhPZ9jZFt6soh +wJVKT/aJnDhJNz5+eA3jAF/4kl8Cro3L1n/jHAuWzY7GACGBTKPasHxzD2JKq7/n8Av PW4ZQTvKAi0wD3vhU8FfV4SVRX0I6T8uJVa9hvedFk0nQpjHrFr6LBgEhowDAw+cXpQ0 YvllfKVBpYQsWXjvIJQd1DC4Qwyx7tI5Moz04fb0F04qsPH46sZ0JF3emL7pELj8DKo3 sLRQ== X-Gm-Message-State: AIVw111118tArIjAXKnWI825XoA3qLMurPv0UjdOl3s49wUXTUqAOQ1f QguXXUXHlyOrxKgtNrCnzwzsnVY6Vw== X-Received: by 10.36.163.198 with SMTP id p189mr22800947ite.64.1499348317296; Thu, 06 Jul 2017 06:38:37 -0700 (PDT) MIME-Version: 1.0 Received: by 10.79.123.93 with HTTP; Thu, 6 Jul 2017 06:38:06 -0700 (PDT) From: "Mr. Jaehoon Paul Jeong" Date: Thu, 6 Jul 2017 22:38:06 +0900 Message-ID: To: james.n.guichard@huawei.com, jmh@joelhalpern.com Cc: sfc@ietf.org, "i2nsf@ietf.org" , skku_secu-brain_all@googlegroups.com Content-Type: multipart/alternative; boundary="94eb2c112f90d8deeb0553a63b8c" Archived-At: Subject: [sfc] Request for Timeslot in SFC WG Meeting X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2017 13:38:46 -0000 --94eb2c112f90d8deeb0553a63b8c Content-Type: text/plain; charset="UTF-8" Hi Jim and Joel, This is Paul at Sungkyunkwan University (SKKU). I am working for service function chaining of networked security services in I2NSF WG. I would like to get feedback and advice from SFC WG to move our I2NSF work forward. Could I present the following draft in SFC WG meeting in Prague? Title: Service Function Chaining-Enabled I2NSF Architecture Draft: draft-hyun-i2nsf-nsf-triggered-steering-03 Link: https://tools.ietf.org/html/draft-hyun-i2nsf-nsf-triggered-steering-03 - Presenters: Jaehoon Paul Jeong and Sangwon Hyun - Time: 15 min Thanks. Best Regards, Paul -- =========================== Mr. Jaehoon (Paul) Jeong, Ph.D. Assistant Professor Department of Software Sungkyunkwan University Office: +82-31-299-4957 Email: jaehoon.paul@gmail.com, pauljeong@skku.edu Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php --94eb2c112f90d8deeb0553a63b8c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Jim and Joel,
This is Paul at Sungkyunkw= an University (SKKU).
I am working for service function chaining = of networked security services in I2NSF WG.

I woul= d like to get feedback and advice from SFC WG=C2=A0
to move our I= 2NSF work forward.

Could I present the following d= raft in SFC WG meeting in Prague?

Title: Service F= unction Chaining-Enabled I2NSF Architecture
Draft: draft-hyun-i2n= sf-nsf-triggered-steering-03

- Presenters: Jaehoon Paul Jeong and Sangwon Hyun
- Time:= 15 min

Thanks.

Best Rega= rds,
Paul
--=C2=A0
=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DMr. Jaehoon (Paul) Jeong, Ph.D.
Assistant Professor
Department of So= ftware
Sungkyunkwan University
Office: +82-31-299-4957
Email: jaehoon.paul@gmail.= com,=C2=A0pauljeong@skku.edu
Personal Homepage: http= ://iotlab.skku.edu/people-jaehoon-jeong.php
=
--94eb2c112f90d8deeb0553a63b8c-- From nobody Thu Jul 6 09:34:06 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D1231317E3 for ; Thu, 6 Jul 2017 09:34:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id suPhq-a6JoU6 for ; Thu, 6 Jul 2017 09:34:03 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CC7DD1317D6 for ; Thu, 6 Jul 2017 09:34:03 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id AD49F1C020B for ; Thu, 6 Jul 2017 09:34:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1499358843; bh=NEUb4N25HY/r0ymrQ/+qGUQmxOw0Y7SxtzN20yC0Slg=; h=To:From:Subject:Date:From; b=oMb7wkfiJYSRDIUqMZGs/YPO2QRfnUSjhgndaQmohdXhvPLHxXQcXKfzyBMkf/9I5 vCXwbJEiWRq/Rsnek2utvyq/8wngvB6JUNyQHCk4tDdF9DXLQHTFHatfxPxwSxj48w 4vTYSZtAXV0kFbV7md+C5cxKYyn407GQXAx6b9Tc= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 5269E1C00B0 for ; Thu, 6 Jul 2017 09:34:03 -0700 (PDT) To: "sfc@ietf.org" From: "Joel M. Halpern" Message-ID: <627d0896-585d-b0ba-3a26-4df81cf47d7a@joelhalpern.com> Date: Thu, 6 Jul 2017 12:34:02 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] NSH draft continuing progress X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2017 16:34:05 -0000 At the request of the authors, we have added a third editor to the NSH document. Carlos Pignataro will be joining Paul and Uri as editor. he will be the pen holder for what we hope is the last round of WG changes, and then the process with the larger IETF and IESG. Our thanks to Carlos for agreeing to help move this forward. Yours, Joel From nobody Thu Jul 6 11:13:24 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EBF79131893 for ; Thu, 6 Jul 2017 11:13:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4sWrj2pkkExK for ; Thu, 6 Jul 2017 11:13:20 -0700 (PDT) Received: from mail-wr0-x236.google.com (mail-wr0-x236.google.com [IPv6:2a00:1450:400c:c0c::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 462D812EC15 for ; Thu, 6 Jul 2017 11:13:20 -0700 (PDT) Received: by mail-wr0-x236.google.com with SMTP id r103so13771076wrb.0 for ; Thu, 06 Jul 2017 11:13:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=EI745cV93Tb+iHkEXeUHNeQkMA1uxLQOh7x6nFprY8E=; b=a5eNV0VQ5DJ+QZAVuuCVHqls/wl5UJjfeNR6R94GV0A/JQpYfERDQ9mWOe6galRDLg C1cUkBOphT4VdH7PWFYbEMTuOc5OGwbjd+2TzD+KqXEReWPvuVkSeX90FV6IEw7bME5J QP5aOkvHRTZwnNfF+bD8KhaFvvj8uBmSQn+ylR9WZlehOENgsdm6ueZV0ez9bwYuUIFq jQhlTqC/wO3Bj2MJRE0wfALo3lXY9hgfEWDERgPb8lstu9mgnnOo4IkhckOJxZlbS0+7 ECcLdNL7wxnKoYv9IpkAVH1BeMROaJ4swXYIE5Yhb3YyXY1vuyVAaWeUziDNk1Cn2ViI BRNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=EI745cV93Tb+iHkEXeUHNeQkMA1uxLQOh7x6nFprY8E=; b=luxXcp2fqzihHLDg6I0vRHLKzcQJAE9zaxnuREB5Ur3Gfr6T2/+7vQy3S438Y5k2in coRvHGSmW+NeZFbiRKxq4m5C1C4MmJBDIebQ1r2mCdOzrjWQM9AKbt2z3WdaotWA5Jfs TBsYLLROyh73yYQrVtWh+HpwlyBi5n2Hc5FpEV3Vk9RblSMDkL6U5UTesze5Vbj1IMmX EIAzEfwErlscU9EP4flVjhKB676Nmxue6n2mU8pNpLM8jMA9YTxF6TBaKrTvWApx9mCD eSr8wql8ojK4dSIGeq6sXyKwh6mgTfmtwSxzOtn3gqocy79oNkCn8kr3whN9by1IdKsT CF2w== X-Gm-Message-State: AIVw1106e7eDOS1R16fmJku0dEAt/nPWsILxv2gu8CkJGPoCoirCb1DS Gr8PUQnZyuGnNw== X-Received: by 10.28.109.26 with SMTP id i26mr373774wmc.64.1499364798805; Thu, 06 Jul 2017 11:13:18 -0700 (PDT) Received: from [192.168.2.126] (host213-123-124-182.in-addr.btopenworld.com. [213.123.124.182]) by smtp.gmail.com with ESMTPSA id b94sm817845wrd.40.2017.07.06.11.13.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 06 Jul 2017 11:13:18 -0700 (PDT) To: Tal Mizrahi , "Carlos Pignataro (cpignata)" Cc: Greg Mirsky , "sfc@ietf.org" , "Fioccola Giuseppe (giuseppe.fioccola@telecomitalia.it)" References: <624141DA-3092-4AF6-B103-1DA614701B10@cisco.com> From: Stewart Bryant Message-ID: Date: Thu, 6 Jul 2017 19:13:16 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB Archived-At: Subject: Re: [sfc] Use of Alternate Marking Method in SFC X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2017 18:13:22 -0000 On 04/07/2017 08:02, Tal Mizrahi wrote: > Hi Carlos, > > My perspective regarding #1 (I can't claim to be impartial, since I am > taking part in both IOAM and Alternate Marking :) is that IOAM and > Alternate Marking are not competing technologies, but complementary > technologies. IOAM provides fine-grained measurement with per-packet > and per-hop information, but comes at the cost of extending the data > packets. Alternate Marking, on the other hand, provides very accurate > per-flow measurement, at the cost of 1 or 2 bits per packet. Based on > this tradeoff, some operators may choose to use IOAM, others may use > Alternate Marking, and some may use both. > > Cheers, > Tal. > +1 Stewart From nobody Thu Jul 6 19:07:23 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1AEF2131537 for ; Thu, 6 Jul 2017 19:07:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WenO8_QhwE5u for ; Thu, 6 Jul 2017 19:07:19 -0700 (PDT) Received: from mail-qk0-x231.google.com (mail-qk0-x231.google.com [IPv6:2607:f8b0:400d:c09::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9FA34129B17 for ; Thu, 6 Jul 2017 19:07:18 -0700 (PDT) Received: by mail-qk0-x231.google.com with SMTP id v143so17257628qkb.0 for ; Thu, 06 Jul 2017 19:07:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=3L5AtOPT+Gq2PO4ahwAfRvbB9XIC/g7UcrJ1R0N56Ew=; b=qaxeCSUeyqrZ5oEz5KC7QKkN8zwmwOX4f1+auxD6uv+OTxSvzF89aelG2v27kF5tD0 98Kj08p0wkI9Oc1dv40XRIbkGW1DQrCb/ot6lKedbpuJqe/Z9MIDw/U0oGdcoBFIjAIe DA/L69ZmXDAXdu3u3Wc/08wcMTWg88v6L4DZlB5aTu8beTNpCXt8XvZoW1ndIH+jgoVn 0CaoQBQzbezDbiqfSGdGCawg+HYqHAgprPqUF0Gd/9D0ilaFMYC8SpfEb44w5KqoMCKC ZZgVRZuUYKNHZyrTLddZK2bP7muLYC9mDX/y04viIzMzfCf6bU0iJcCRrGwXLG8/xjkO bHtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=3L5AtOPT+Gq2PO4ahwAfRvbB9XIC/g7UcrJ1R0N56Ew=; b=htNp+JXOZO1tr5C1qamCvq1RLqIXDPQdG5dRzY5kyYK0XbZGPJI6B1gjRK8jYLIF7y tCWRH6pD7rgrLKnPiWsBqDpd1cF4OjkkEIMsH6DuKzkii47t3s/XgsIA1Snc/OHwtvmH MDhOk7sKHgHI6tdpb5Bip6+sCdolIQ2MiPJbJ/G+WWfJePT6Zeyl0jFB7PRwLpKz0qIX /k0waCMzxIrfvrDruYzu/7GkUPUNI1GG3HWM7Qc0Q/nBfCLt5oPfiXJHqqTgzSfOaIay 3Yv5LvzuCniBGPzPevM2Ua1TJDidnxgFS4mXkNS93NdZAQz6Si8mPONn4TE1SS74/1jg bIRA== X-Gm-Message-State: AKS2vOx87DWftCgkC8EXd4BvG8854/JyYfLAEODcOui8H/XpOSTf1TSF A8wdhpbSt2eYMA+YoJ4Y1/EvMz70ag== X-Received: by 10.55.198.66 with SMTP id b63mr59904304qkj.224.1499393237644; Thu, 06 Jul 2017 19:07:17 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Thu, 6 Jul 2017 19:07:16 -0700 (PDT) In-Reply-To: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> From: Greg Mirsky Date: Thu, 6 Jul 2017 19:07:16 -0700 Message-ID: To: James N Guichard Cc: "Carlos Pignataro (cpignata)" , "Joel M. Halpern" , "Andrew G. Malis" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a11499c044efdbf0553b0b171" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 02:07:22 -0000 --001a11499c044efdbf0553b0b171 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Jim, I can give my interpretation of what Carlos had proposed and how his clarification may be reflected in the document: OLD: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). NEW: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM payload immediately following NSH. In all other cases, i.e. when the payload is not OAM, the O-bit MUST be reset. The actual packet format and processing of SFC OAM messages are outside the scope of this specification (see [oam-frame]). Regards, Greg On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard < james.n.guichard@huawei.com> wrote: > Hi Greg/Carlos, > > > > It is difficult to tell from this thread whether a textual change is bein= g > proposed or if the current text is sufficient; please can you clarify for > the WG and if a textual change is being proposed please clearly state wha= t > this is so that the WG can evaluate and we can move forward. > > > > Many thanks! > > > > Jim > > > > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Greg Mirsky > *Sent:* Tuesday, July 04, 2017 1:41 AM > *To:* Carlos Pignataro (cpignata) > *Cc:* Joel M. Halpern ; Andrew G. Malis < > agmalis@gmail.com>; sfc@ietf.org > *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF > 99 in Prague] > > > > Hi Carlos, > > you have valid interpretation of the text in its current version. And I > think that if it was in the document as you have presented (or very close > to it), it would address my concern, as you've provided clear and > unambiguous definition of what considered as OAM packet in SFC - packet > that carries OAM information as payload that immediately follows the NSH. > > > > Regards, > > Greg > > > > On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > > Hi Andy, > > > > I believe that s/packet/information/ can actually cause more confusion > that bring clarity. > > > > O=3D0 means that the payload is a user packet. O=3D1 means the payload is= an > OAM packet. > > > > However, this is independent of the Metadata, since some Metadata can be > OAM-ish (as a timestamp). And this is also independent of a NULL payload = as > in Adrian=E2=80=99s draft. > > > > A user packet with OAM-ish metadata will have O=3D0. > > > > The text can always be polished more =E2=80=94 I am not sure if we might = be in > diminishing return territory. > > > > (I would not oppose a clarification that speaks to the metadata > independence of O for user packets, although maybe that does belong in > other documents) > > > > Thanks! > > > > Carlos. > > > > On Jul 1, 2017, at 5:26 PM, Andrew G. Malis wrote: > > > > Joel, > > > > I would like to suggest changing: > > > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > > > to: > > > > O bit: Setting this bit indicates the presence of Operations, > Administration, and > Maintenance (OAM) information. The actual OAM information format and > processing > > is outside the scope of this specification (see [oam-frame]). > > > > > > The reason for this change is that we don=E2=80=99t yet know if the forma= t of OAM > information, and whether it will be in metadata, packet contents, or > both. Thus, we don=E2=80=99t yet even know if there will be =E2=80=9COAM = packets=E2=80=9D per se, > as data packets could possibly also carry OAM information in the metadata= . > > > > If this change is acceptable, then the following two paragraphs should > also be amended to: > > > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O bit set, but MAY support > a configurable parameter to enable forwarding received packets with th= e > O bit > > set unmodified to the next element in the chain. Forwarding > packets with the O bit set unmodified by SFC elements that do not > support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding a packet with the O bit set for all > OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > The O bit MUST be set for packets containing OAM information and MUST > NOT be set for > packets without OAM information. The O bit MUST NOT be modified along > the SFP. > > > > > > Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D and O-bit=E2=80= =9D used in the document. The > document should choose one. > > > > Thanks, > > Andy > > > > > > On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern > wrote: > > The definition of the O bit in the document is: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O-bit set, but MAY support > a configurable parameter to enable forwarding received SFC OAM > packets unmodified to the next element in the chain. Forwarding OAM > packets unmodified by SFC elements that do not support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding an OAM packet for all OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > This seems to me a VERY clear description of when the bit is to be set, > and what handling is required when packets with this bit are received at = an > NSH support entity. > > If you consider this wording unclear, please propose specific text to > improve it. > > Yours, > Joel > > On 7/1/17 5:02 PM, Greg Mirsky wrote: > > Hi Joel, > by all means, I'm not asking to hold NSH document until SFC OAM solutions > progress. But NSH refers to OAM packet and, in my view, it is too ambiguo= us > term. Please consider, OAM packet may be: > > * control message of active SFC OAM protocol carried as payload; > * control message of active SFC OAM protocol carried as metadata; > * control information and/or measurement results of hybrid SFC OAM > protocol carried as metadata > > If work on OAM framework is progressing, perhaps all the OAM related > discussion as well as allocation of the O-bit itself can be moved there. > > As co-author of several SFC OAM drafts I'd note that none of them has > dependency on where OAM information must be placed, metadata or payload. > But clear and unambiguous definitionsof OAM packet and interpretation of > O-bit are very much needed and will help to progress SFC OAM solutions. > > Regards, > Greg > > On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern > wrote: > > Greg, the editors are working on the revision of the OAM Framework > document. > > > More importantly, we have been careful that the NSH document does > not normatively depend upon the OAM specification. This was > discussed with the working group several times, and the OAM wording > in -13 is the result of that discussion. > > > Are you really asking that we hold up RFC publication of the NSH > document until we have agreement on all of the complex OAM issues > (such as in-situ, etc.) I observe a steady rate of new OAM > proposals, with new behaviors. That seems to indicate that such > ahold-up would be almost indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky wrote: > > Hi Joel, Adrian, et. al, > you'd expect that I'll look into OAM bit and wording on OAM > packet first. And so I had. I'm concerned that NSH refers to > expired and, frankly, stalled document that had not been > discussed for too long. I believe the NSH document should have > or refer to clear definition of SFC OAM packet before it defines > interpretation of O-bit flag. draft-farrel-sfc-convent correctly > points that in current form O-bit indicates presence of OAM > information which can be either as metadata or as payload. I > believe that we must have more clear and deterministic > definition of OAM packet as current, in my opinion, may cause > problems for HW-based SFC OAM support. > > Regards, > Greg > > On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct > > > >> wrote: > > The -13 will be out in a few days with all the changes. > That is what we will ask the WG to review. > If we already had it out, we would have already asked for > the WG to > take a last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, Greg Mirsky wrote: > > Hi Joel, > is the -12 the latest published version of the NSH > draft? As I > see, it is missing TTL and all related changes: > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > > =E2=80=94 > > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > > > > --001a11499c044efdbf0553b0b171 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Jim,
I can give my interpretation of what Carlos ha= d proposed and how his clarification may be reflected in the document:
OLD:
<=
font face=3D"arial, helvetica, sans-serif">   O bit: Setting this bit indic=
ates an Operations, Administration, and
   Maintenance (OAM) packet.  The actual packet format and processing of
   SFC OAM messages is outside the scope of this specification (see
   [oam-frame]).
NEW:
   O bit: Setting this bit indicates an Operations, Administra=
tion, and
   Maintenance (OAM) packet.  SFC OAM packet is the packet that has OAM pay=
load immediately following NSH.  In all other cases, i.e. when the payload =
is not OAM, the O-bit MUST be reset. The actual packet format and processin=
g of SFC OAM messages are outside the scope of this specification (see [oam=
-frame]).
Regards,
<=
pre style=3D"box-sizing:border-box;overflow:auto;padding:10px;margin-top:0p=
x;margin-bottom:10.5px;line-height:1.214;word-break:break-all;word-wrap:bre=
ak-word;border:1px solid rgb(204,204,204);border-radius:4px">Greg

On Wed, Jul 5, 2017 at 8:45= AM, James N Guichard <james.n.guichard@huawei.com> wrote:

Hi Greg/Carlos,<= /p>

=C2=A0

It is difficult to tell from this thr= ead whether a textual change is being proposed or if the current text is su= fficient; please can you clarify for the WG and if a textual change is being proposed please clearly state what this is so= that the WG can evaluate and we can move forward.

=C2=A0

Many thanks!

=C2=A0

Jim

<= span style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;c= olor:#1f497d">=C2=A0

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Greg Mirsky
Sent: Tuesday, July 04, 2017 1:41 AM
To: Carlos Pignataro (cpignata) <cpignata@cisco.com>
Cc: Joel M. Halpern <jmh@joelhalpern.com>; Andrew G. Malis <agmalis@gmail.com>; sfc@ietf.org
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IET= F 99 in Prague]

=C2=A0

Hi Carlos,

you have valid interpretation of the text in its cur= rent version. And I think that if it was in the document as you have presen= ted (or very close to it), it would address my concern, as you've provi= ded clear and unambiguous definition of what considered as OAM packet in SFC - packet that carries OAM information= as payload that immediately follows the NSH.

=C2=A0

Regards,

Greg

=C2=A0

On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cp= ignata) <cpignat= a@cisco.com> wrote:

Hi Andy,

=C2=A0

I believe that s/packet/information/ can actually ca= use more confusion that bring clarity.

=C2=A0

O=3D0 means that the payload is a user packet. O=3D1= means the payload is an OAM packet.=C2=A0

=C2=A0

However, this is independent of the Metadata, since = some Metadata can be OAM-ish (as a timestamp). And this is also independent= of a NULL payload as in Adrian=E2=80=99s draft.

=C2=A0

A user packet with OAM-ish metadata will have O=3D0.=

=C2=A0

The text can always be polished more =E2=80=94 I am = not sure if we might be in diminishing return territory.

=C2=A0

(I would not oppose a clarification that speaks to t= he metadata independence of O for user packets, although maybe that does be= long in other documents)

=C2=A0

Thanks!

=C2=A0

Carlos.<= /span>

=C2=A0

On Jul 1, 2017, at 5:26 PM, Andrew G. Malis <agmalis@gmail.com>= ; wrote:

=C2=A0

Joel,

=C2=A0

I would like to suggest changing:

=C2=A0

O bit: Setting this = bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC=C2=A0OAM messages is outside the scope of this specificati= on (see
=C2=A0 =C2=A0[oam-frame]).

=C2=A0

to:=

=C2=A0

O bit: Setting this = bit indicates the presence of Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) information.=C2=A0 The actual OAM informatio= n format and processing

=C2=A0 =C2=A0is outs= ide the scope of this specification (see=C2=A0 [oam-frame]).<= u>

=C2=A0

=C2=A0

The reason for this = change is that we don=E2=80=99t yet know if the format of OAM information, = and whether it will be in metadata, packet contents, or both.=C2=A0Thus, we= don=E2=80=99t yet even know if=C2=A0there will be=C2=A0=E2=80=9COAM packet= s=E2=80=9D per se, as data packets=C2=A0could possibly also carry OAM=C2=A0informatio= n in the metadata.

=C2=A0

If=C2=A0this change = is acceptable, then the following two paragraphs should also be amended to:=

=C2=A0

=C2=A0 =C2=A0SF/SFF/= SFC=C2=A0Proxy/Classifer implementations that do not support=C2=A0SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received packets= with the O bit

=C2=A0 =C2=A0set unm= odified to the next element in the chain.=C2=A0 Forwarding
=C2=A0 =C2=A0packets with the O bit set unmodified by=C2=A0SFC=C2=A0element= s that do not support=C2=A0SFC=C2=A0OAM
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding a packet with the O bit set f= or all OAM functions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O bit MUST be set for packets containing OAM information a= nd MUST NOT be set for=C2=A0
=C2=A0 =C2=A0packets without OAM information.=C2=A0 The O bit MUST NOT be m= odified along the SFP.

=C2=A0

=C2=A0

Finally, I=E2=80=99v= e seen both=C2=A0=E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D used in the doc= ument.=C2=A0The document should choose one.

=C2=A0

Thanks,

Andy

=C2=A0

=C2=A0

On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern <= jmh@joelhalpern.co= m> wrote:

The definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC OAM messages is outside the scope of this specification (s= ee
=C2=A0 =C2=A0[oam-frame]).

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O-bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received SFC OAM=
=C2=A0 =C2=A0packets unmodified to the next element in the chain.=C2=A0 For= warding OAM
=C2=A0 =C2=A0packets unmodified by SFC elements that do not support SFC OAM=
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding an OAM packet for all OAM fun= ctions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:

Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutio= ns progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous term. Please consider, OAM packet may be:

=C2=A0 * control message of active SFC OAM protocol carried as payload;
=C2=A0 * control message of active SFC OAM protocol carried as metadata; =C2=A0 * control information and/or measurement results of hybrid SFC OAM =C2=A0 =C2=A0 protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has d= ependency on where OAM information must be placed, metadata or payload. But= clear and unambiguous definitionsof OAM packet and interpretation of O-bit= are very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern <= jmh@joelhalpern.co= m <mailto:j= mh@joelhalpern.com>> wrote:

=C2=A0 =C2=A0 Greg, the editors are working on the revision of the OAM Fram= ework
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 More importantly, we have been careful that the NSH document = does
=C2=A0 =C2=A0 not normatively depend upon the OAM specification.=C2=A0 This= was
=C2=A0 =C2=A0 discussed with the working group several times, and the OAM w= ording
=C2=A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 Are you really asking that we hold up RFC publication of the = NSH
=C2=A0 =C2=A0 document until we have agreement on all of the complex OAM is= sues
=C2=A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady rate of new = OAM
=C2=A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to indicate t= hat such
=C2=A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bi= t and wording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned t= hat NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document that had= not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM packet = before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit indicates pre= sence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as metadata or = as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and determ= inistic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in my opin= ion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhal= pern.com>

=C2=A0 =C2=A0 =C2=A0 = =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com>>>= wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a fe= w days with all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask th= e WG to review.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, w= e would have already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 th= e latest published version of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is mi= ssing TTL and all related changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 __________________________________________= _____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/mailman/listinfo/sfc=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailman/listinfo/sfc= >


_______________________________________________
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

=C2=A0

_______________________________________________=
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

=C2=A0

=E2=80=94<= /span>

Carlos Pignataro,=C2=A0<= a href=3D"mailto:carlos@cisco.com" target=3D"_blank">carlos@cisco.com
=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."

=C2=A0

=C2=A0


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Halpern" , "Andrew G. Malis" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA Date: Fri, 7 Jul 2017 03:14:13 +0000 Message-ID: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: multipart/alternative; boundary="_000_CFE231EE4D464E008D6DD92EDE4EE480ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] 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autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 86xMekmwLdee for ; Thu, 6 Jul 2017 20:20:10 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B5FD5126E3A for ; Thu, 6 Jul 2017 20:20:09 -0700 (PDT) Received: from WTL-EXCHP-1.sandvine.com ([fe80::ac6b:cc1e:f2ff:93aa]) by wtl-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Thu, 6 Jul 2017 23:20:06 -0400 From: Dave Dolson To: "Carlos Pignataro (cpignata)" , Greg Mirsky CC: "Joel M. Halpern" , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llY= Date: Fri, 7 Jul 2017 03:20:06 +0000 Message-ID: <20170707032005.5144657.26796.21967@sandvine.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_2017070703200551446572679621967sandvinecom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 03:20:14 -0000 --_000_2017070703200551446572679621967sandvinecom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Practically, "The O-bit MUST be zero." Until OAM for NSH is defined. Isn't that where we are at? David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Thursday, July 6, 2017 11:14 PM To: Greg Mirsky Cc: Joel M. Halpern; Andrew G. Malis; sfc@ietf.org; James N Guichard Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague] Thanks Greg and Jim. I would like to close on this item. For clarity, what you (Greg) are proposing is the addition of the following= text: =93SFC OAM packet is the packet that has OAM payload immediately following = NSH. In all other cases, i.e. when the payload is not OAM, the O-bit MUST = be reset.=94 And while at first glance it sounds like a potentially useful or at least n= on-harmful addition, very similar text already exists one paragraph below: =93The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM pa= ckets. The O-bit MUST NOT be modified along the SFP.=94 I prefer to specify as little as possible of OAM here, since we are already= pointing to a spec that would detail this processing. Things like =93immed= iately following=94 can be specified in the OAM document. As it is now, wha= t O means is clear and aligns with what I wrote below. Additionally, I=92d much rather not change the text that was worked through= iterations and consensus. However, I suggest we can move up that sentence = one paragraph up to improve the flow and make it explicitly clear: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [I-D.ietf-sfc-oam-framework]). + The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM + packets. The O-bit MUST NOT be modified along the SFP. + SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. - The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM - packets. The O-bit MUST NOT be modified along the SFP. - Thoughts on this proposal? It seems to achieve the right balance of not ove= r specify but bring clarity. Thanks, =97 Carlos. On Jul 6, 2017, at 10:07 PM, Greg Mirsky > wrote: Hi Jim, I can give my interpretation of what Carlos had proposed and how his clarif= ication may be reflected in the document: OLD: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). NEW: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM pay= load immediately following NSH. In all other cases, i.e. when the payload = is not OAM, the O-bit MUST be reset. The actual packet format and processin= g of SFC OAM messages are outside the scope of this specification (see [oam= -frame]). Regards, Greg On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard > wrote: Hi Greg/Carlos, It is difficult to tell from this thread whether a textual change is being = proposed or if the current text is sufficient; please can you clarify for t= he WG and if a textual change is being proposed please clearly state what t= his is so that the WG can evaluate and we can move forward. Many thanks! Jim From: sfc [mailto:sfc-bounces@ietf.org] On Beh= alf Of Greg Mirsky Sent: Tuesday, July 04, 2017 1:41 AM To: Carlos Pignataro (cpignata) > Cc: Joel M. Halpern >; Andr= ew G. Malis >; sfc@ietf.org Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague] Hi Carlos, you have valid interpretation of the text in its current version. And I thi= nk that if it was in the document as you have presented (or very close to i= t), it would address my concern, as you've provided clear and unambiguous d= efinition of what considered as OAM packet in SFC - packet that carries OAM= information as payload that immediately follows the NSH. Regards, Greg On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) > wrote: Hi Andy, I believe that s/packet/information/ can actually cause more confusion that= bring clarity. O=3D0 means that the payload is a user packet. O=3D1 means the payload is a= n OAM packet. However, this is independent of the Metadata, since some Metadata can be OA= M-ish (as a timestamp). And this is also independent of a NULL payload as i= n Adrian=92s draft. A user packet with OAM-ish metadata will have O=3D0. The text can always be polished more =97 I am not sure if we might be in di= minishing return territory. (I would not oppose a clarification that speaks to the metadata independenc= e of O for user packets, although maybe that does belong in other documents= ) Thanks! Carlos. On Jul 1, 2017, at 5:26 PM, Andrew G. Malis > wrote: Joel, I would like to suggest changing: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). to: O bit: Setting this bit indicates the presence of Operations, Administratio= n, and Maintenance (OAM) information. The actual OAM information format and pr= ocessing is outside the scope of this specification (see [oam-frame]). The reason for this change is that we don=92t yet know if the format of OAM= information, and whether it will be in metadata, packet contents, or both.= Thus, we don=92t yet even know if there will be =93OAM packets=94 per se, = as data packets could possibly also carry OAM information in the metadata. If this change is acceptable, then the following two paragraphs should also= be amended to: SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O bit set, but MAY support a configurable parameter to enable forwarding received packets with the = O bit set unmodified to the next element in the chain. Forwarding packets with the O bit set unmodified by SFC elements that do not suppor= t SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding a packet with the O bit set for all OAM= functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O bit MUST be set for packets containing OAM information and MUST NO= T be set for packets without OAM information. The O bit MUST NOT be modified along t= he SFP. Finally, I=92ve seen both =93O bit=94 and O-bit=94 used in the document. Th= e document should choose one. Thanks, Andy On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern > wrote: The definition of the O bit in the document is: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O-bit MUST NOT be modified along the SFP. This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity. If you consider this wording unclear, please propose specific text to impro= ve it. Yours, Joel On 7/1/17 5:02 PM, Greg Mirsky wrote: Hi Joel, by all means, I'm not asking to hold NSH document until SFC OAM solutions p= rogress. But NSH refers to OAM packet and, in my view, it is too ambiguous = term. Please consider, OAM packet may be: * control message of active SFC OAM protocol carried as payload; * control message of active SFC OAM protocol carried as metadata; * control information and/or measurement results of hybrid SFC OAM protocol carried as metadata If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there. As co-author of several SFC OAM drafts I'd note that none of them has depen= dency on where OAM information must be placed, metadata or payload. But cle= ar and unambiguous definitionsof OAM packet and interpretation of O-bit are= very much needed and will help to progress SFC OAM solutions. Regards, Greg On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern >> wrote: Greg, the editors are working on the revision of the OAM Framework document. More importantly, we have been careful that the NSH document does not normatively depend upon the OAM specification. This was discussed with the working group several times, and the OAM wording in -13 is the result of that discussion. Are you really asking that we hold up RFC publication of the NSH document until we have agreement on all of the complex OAM issues (such as in-situ, etc.) I observe a steady rate of new OAM proposals, with new behaviors. That seems to indicate that such ahold-up would be almost indefinite. Yours, Joel M. Halpern On 7/1/17 3:39 PM, Greg Mirsky wrote: Hi Joel, Adrian, et. al, you'd expect that I'll look into OAM bit and wording on OAM packet first. And so I had. I'm concerned that NSH refers to expired and, frankly, stalled document that had not been discussed for too long. I believe the NSH document should have or refer to clear definition of SFC OAM packet before it defines interpretation of O-bit flag. draft-farrel-sfc-convent correctly points that in current form O-bit indicates presence of OAM information which can be either as metadata or as payload. I believe that we must have more clear and deterministic definition of OAM packet as current, in my opinion, may cause problems for HW-based SFC OAM support. Regards, Greg On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct > >>> wrote: The -13 will be out in a few days with all the changes. That is what we will ask the WG to review. If we already had it out, we would have already asked for the WG to take a last look. Yours, Joel On 6/29/17 7:21 PM, Greg Mirsky wrote: Hi Joel, is the -12 the latest published version of the NSH draft? As I see, it is missing TTL and all related changes: _______________________________________________ sfc mailing list sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc =97 Carlos Pignataro, carlos@cisco.com =93Sometimes I use big words that I do not fully understand, to make myself= sound more photosynthesis." =97 Carlos Pignataro, carlos@cisco.com =93Sometimes I use big words that I do not fully understand, to make myself= sound more photosynthesis." --_000_2017070703200551446572679621967sandvinecom_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
David Dolson
Sandvine
From: Carlos Pignataro (cpignata)
Sent: Thursday, July 6, 2017 11:14 PM
To: Greg Mirsky
Cc: Joel M. Halpern; Andrew G. Malis; sfc@ietf.org; James N Gui= chard
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting a= t IETF 99 in Prague]

Thanks Greg and Jim. I would like to close on this item.

For clarity, what you (Greg) are proposing is the addition = of the following text:

=93SFC OAM packet is the packet that has OAM payload immedi= ately following NSH.  In all other cases, i.e. when the payload i= s not OAM, the O-bit MUST be reset.=94

And while at first glance it sounds like a potentially useful or at le= ast non-harmful addition, very similar text already exists one paragraph be= low:

=93The O-bit MUST be set for OAM packets and MUST NOT be set= for non-OAM packets.  The O-bit MUST NOT be modif= ied along the SFP.=94

I prefer to specify as little as possible of OAM here, since we are al= ready pointing to a spec that would detail this processing. Things like =93= immediately following=94 can be specified in the OAM document. As it is now= , what O means is clear and aligns with what I wrote below.

Additionally, I=92d much rather not change the text that was worked th= rough iterations and consensus. However, I suggest we can move up that sent= ence one paragraph up to improve the flow and make it explicitly clear:


    O bit: Setting this bit indicates an Operations, Ad= ministration, and
    Maintenance (OAM) packet.  The actual packet f= ormat and processing of
    SFC OAM messages is outside the scope of this specificat= ion (see
    [I-D.ietf-sfc-oam-framework]).
 
+   The O-bit MUST be set for OAM packets and MUST NOT b= e set for non-OAM
+   packets.  The O-bit MUST NOT be modified a= long the SFP.
+
    SF/SFF/SFC Proxy/Classifer implementations that do not s= upport SFC
    OAM procedures SHOULD discard packets with O-bit set, bu= t MAY support
    a configurable parameter to enable forwarding received S= FC OAM
    packets unmodified to the next element in the chain.&nbs= p; Forwarding OAM
    packets unmodified by SFC elements that do not support S= FC OAM
    procedures may be acceptable for a subset of OAM functio= ns, but can
    result in unexpected outcomes for others, thus it is rec= ommended to
    analyze the impact of forwarding an OAM packet for all O= AM functions
    prior to enabling this behavior.  The configur= able parameter MUST be
    disabled by default.
 
-   The O-bit MUST be set for OAM packets and MUST NOT be se= t for non-OAM
-   packets.  The O-bit MUST NOT be modified along= the SFP.
-

Thoughts on this proposal? It seems to achieve the right balance of no= t over specify but bring clarity.

Thanks,

=97 Carlos.


On Jul 6, 2017, at 10:07 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:<= /div>
Hi Jim,
I can give my interpretation of what Carlos had proposed an= d how his clarification may be reflected in the document:
OLD:
   O=
 bit: Setting this bit indicates an Operations, Administration, and
   Maintenance (OAM) packet.  The actual packet format and processing of
   SFC OAM messages is outside the scope of this specification (see
   [oam-frame]).
NEW:=

   O bit: Setting this bit indicates an=
 Operations, Administration, and
   Maintenance (OAM) packet.  SFC OAM packet is the packet that has OAM pay=
load immediately following NSH.  In all other cases, i.e. when the payload =
is not OAM, the O-bit MUST be reset. The actual packet format and processin=
g of SFC OAM messages are outside the scope of this specification (see [oam=
-frame]).
Regards,
Greg

On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard= <james.n.guichard@huawei.com> wrote:

Hi Greg/Carlos,

 =

It is difficult to tell = from this thread whether a textual change is being proposed or if the curre= nt text is sufficient; please can you clarify for the WG and if a textual change is being proposed please clearly state what= this is so that the WG can evaluate and we can move forward.=

 =

Many thanks!

 =

Jim

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Greg Mirsky
Sent: Tuesday, July 04, 2017 1:41 AM
To: Carlos Pignataro (cpignata) <cpignata@cisco.com> Cc: Joel M. Halpern <jmh@joelhalpern.com>; Andrew G. M= alis <= agmalis@gmail.com>; sfc@ietf.org
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Mee= ting at IETF 99 in Prague]

 

Hi Carlos,

you have valid interpretation of the text in its cur= rent version. And I think that if it was in the document as you have presen= ted (or very close to it), it would address my concern, as you've provided = clear and unambiguous definition of what considered as OAM packet in SFC - packet that carries OAM information= as payload that immediately follows the NSH.

 

Regards,

Greg

 

On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cp= ignata) <cpignata@cisco.com> wrote:=

Hi Andy,

 

I believe that s/packet/information/ can actually ca= use more confusion that bring clarity.<= /p>

 

O=3D0 means that the payload is a user packet. O=3D1= means the payload is an OAM packet. <= /u>

 

However, this is independent of the Metadata, since = some Metadata can be OAM-ish (as a timestamp). And this is also independent= of a NULL payload as in Adrian=92s draft.<= /u>

 

A user packet with OAM-ish metadata will have O=3D0.=

 

The text can always be polished more =97 I am not su= re if we might be in diminishing return territory.

 

(I would not oppose a clarification that speaks to t= he metadata independence of O for user packets, although maybe that does be= long in other documents)

 

Thanks!

 

Carlos.

 

On Jul 1, 2017, at 5:26 PM, Andrew G. Malis <agmalis@gmail= .com> wrote:

 

Joel,

 

I would like to suggest changing:<= u class=3D"">

 

O bit: Se= tting this bit indicates an Operations, Administration, and
   Maintenance (OAM) packet.  The actual packet format and p= rocessing of
   SFC OAM messages is outside the scope of this specificati= on (see
   [oam-frame]).

 

to:

 

O bit: Se= tting this bit indicates the presence of Operations, Administration, and    Maintenance (OAM) information.  The actual OAM informatio= n format and processing

  &n= bsp;is outside the scope of this specification (see  [oam-frame]).

 

 

The reaso= n for this change is that we don=92t yet know if the format of OAM informat= ion, and whether it will be in metadata, packet contents, or both. Thu= s, we don=92t yet even know if there will be =93OAM packets=94 per se, as data packets could possibly also carry OAM = ;information in the metadata.

 

If t= his change is acceptable, then the following two paragraphs should also be = amended to:

 

  &n= bsp;SF/SFF/SFC Proxy/Classifer implementations that do not support&nbs= p;SFC
   OAM procedures SHOULD discard packets with O bit set, but MAY = support
   a configurable parameter to enable forwarding received packets= with the O bit

  &n= bsp;set unmodified to the next element in the chain.  Forwarding
   packets with the O bit set unmodified by SFC element= s that do not support SFC OAM
   procedures may be acceptable for a subset of OAM functions, bu= t can
   result in unexpected outcomes for others, thus it is recommend= ed to
   analyze the impact of forwarding a packet with the O bit set f= or all OAM functions
   prior to enabling this behavior.  The configurable parame= ter MUST be
   disabled by default.

   The O bit MUST be set for packets containing OAM information a= nd MUST NOT be set for 
   packets without OAM information.  The O bit MUST NOT be m= odified along the SFP.

 

 

Finally, = I=92ve seen both =93O bit=94 and O-bit=94 used in the document. T= he document should choose one.

 

Thanks,

Andy

 

 

On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern <= jmh@joe= lhalpern.com> wrote:

The definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
   Maintenance (OAM) packet.  The actual packet format and p= rocessing of
   SFC OAM messages is outside the scope of this specification (s= ee
   [oam-frame]).

   SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
   OAM procedures SHOULD discard packets with O-bit set, but MAY = support
   a configurable parameter to enable forwarding received SFC OAM=
   packets unmodified to the next element in the chain.  For= warding OAM
   packets unmodified by SFC elements that do not support SFC OAM=
   procedures may be acceptable for a subset of OAM functions, bu= t can
   result in unexpected outcomes for others, thus it is recommend= ed to
   analyze the impact of forwarding an OAM packet for all OAM fun= ctions
   prior to enabling this behavior.  The configurable parame= ter MUST be
   disabled by default.

   The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
   packets.  The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:

Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutions p= rogress. But NSH refers to OAM packet and, in my view, it is too ambiguous = term. Please consider, OAM packet may be:

  * control message of active SFC OAM protocol carried as payload;
  * control message of active SFC OAM protocol carried as metadata;   * control information and/or measurement results of hybrid SFC OAM     protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has depen= dency on where OAM information must be placed, metadata or payload. But cle= ar and unambiguous definitionsof OAM packet and interpretation of O-bit are= very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern <= jmh@joe= lhalpern.com <mailto:jmh@joelhalpern.com>> wrote:

    Greg, the editors are working on the revision of the OAM Fram= ework
    document.

    <chair hat on>
    More importantly, we have been careful that the NSH document = does
    not normatively depend upon the OAM specification.  This= was
    discussed with the working group several times, and the OAM w= ording
    in -13 is the result of that discussion.
    </chair hat on>
    <chair hat off>
    Are you really asking that we hold up RFC publication of the = NSH
    document until we have agreement on all of the complex OAM is= sues
    (such as in-situ, etc.)  I observe a steady rate of new = OAM
    proposals, with new behaviors.  That seems to indicate t= hat such
    ahold-up would be almost indefinite.
    </chair hat off>

    Yours,
    Joel M. Halpern

    On 7/1/17 3:39 PM, Greg Mirsky wrote:

        Hi Joel, Adrian, et. al,
        you'd expect that I'll look into OAM bit and wo= rding on OAM
        packet first. And so I had. I'm concerned that = NSH refers to
        expired and, frankly, stalled document that had= not been
        discussed for too long. I believe the NSH docum= ent should have
        or refer to clear definition of SFC OAM packet = before it defines
        interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
        points that in current form O-bit indicates pre= sence of OAM
        information which can be either as metadata or = as payload. I
        believe that we must have more clear and determ= inistic
        definition of OAM packet as current, in my opin= ion, may cause
        problems for HW-based SFC OAM support.

        Regards,
        Greg

        On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
        <jmh.direct@joelhalpern.com <mailto:<= a href=3D"mailto:jmh.direct@joelhalpern.com" target=3D"_blank" class=3D"">j= mh.direct@joelhalpern.com>

      =   <mailto:jmh.direct@joelhalpern.com
        <mailto:jmh.direct@joelhalpe= rn.com>>> wrote:

             The -13 will be out in a fe= w days with all the changes.
             That is what we will ask th= e WG to review.
             If we already had it out, w= e would have already asked for
        the WG to
             take a last look.

             Yours,
             Joel


             On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

                 Hi Joel,
                 is the -12 th= e latest published version of the NSH
        draft? As I
                 see, it is mi= ssing TTL and all related changes:




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=97

Carlos Pignataro, <= a href=3D"mailto:carlos@cisco.com" target=3D"_blank" class=3D"">carlos@cisc= o.com

=93Sometimes I use big words that I do not fully understand, = to make myself sound more photosynthesis."<= u class=3D"">

 

 



=97
Carlos Pignataro, carlo= s@cisco.com

=93Sometimes I use big words that I do not fully understand, = to make myself sound more photosynthesis."

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Halpern" , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAA== Date: Fri, 7 Jul 2017 03:24:23 +0000 Message-ID: <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> In-Reply-To: <20170707032005.5144657.26796.21967@sandvine.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: 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dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vKQcy1UapHjA for ; Thu, 6 Jul 2017 20:48:56 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3F8B0126B72 for ; Thu, 6 Jul 2017 20:48:56 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id 1AAC71C020B; Thu, 6 Jul 2017 20:48:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1499399336; bh=afMxjDZ7txY1Nyj3nKJwrevkhoHGxu2wrCEebuKqJA8=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=AzqmjEHatFp4t/UZQitOxcvzs5HAM/LtRPDNlsOg+Nga78s5N/sNMQOCHoHX9i18q JzKd8LGy7kSu18FFOaFHJT7Tz0821BBIeZfP2b6YeuQMZu8N0Znffd3SgKBB5CqZaC eArLlxkI17XHI2vTEc8qJbVC3GTok8mJ83ADVc60= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 966F51C0AF8; Thu, 6 Jul 2017 20:48:54 -0700 (PDT) To: "Carlos Pignataro (cpignata)" , Dave Dolson Cc: Greg Mirsky , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> From: "Joel M. Halpern" Message-ID: <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> Date: Thu, 6 Jul 2017 23:48:53 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 03:48:58 -0000 The current text says rather more than just "the O bit must be zero". It prescribes what behavior should be implemented in NSH devices for processing packets where the O bit is set. Which we were specifically asked to provide. Speaking personally, I prefer that the OAM text in the NSH document not specify where the OAM information is carried. While some folks have assumptions about where the information will reside, we have not agreed on that. Yours, Joel On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote: > Correct practically — zero for user packets. > > And I believe that’s what this says (using more words): > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [I-D.ietf-sfc-oam-framework]). > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > > Thanks, > > — Carlos. > >> On Jul 6, 2017, at 11:20 PM, Dave Dolson > > wrote: >> >> Practically, "The O-bit MUST be zero." Until OAM for NSH is defined. >> Isn't that where we are at? >> >> >> >> David Dolson >> Sandvine >> *From: *Carlos Pignataro (cpignata) >> *Sent: *Thursday, July 6, 2017 11:14 PM >> *To: *Greg Mirsky >> *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org >> ; James N Guichard >> *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at >> IETF 99 in Prague] >> >> >> Thanks Greg and Jim. I would like to close on this item. >> >> For clarity, what you (Greg) are proposing is the addition of the >> following text: >> >> “SFC OAM packet is the packet that has OAM payload immediately >> following NSH. In all other cases, i.e. when the payload is not OAM, >> the O-bit MUST be reset.†>> >> And while at first glance it sounds like a potentially useful or at >> least non-harmful addition, very similar text already exists one >> paragraph below: >> >> “The O-bit MUST be set for OAM packets and MUST NOT be set for >> non-OAM packets. The O-bit MUST NOT be modified along the SFP.†>> >> I prefer to specify as little as possible of OAM here, since we are >> already pointing to a spec that would detail this processing. Things >> like “immediately following†can be specified in the OAM document. As >> it is now, what O means is clear and aligns with what I wrote below. >> >> Additionally, I’d much rather not change the text that was worked >> through iterations and consensus. However, I suggest we can move up >> that sentence one paragraph up to improve the flow and make it >> explicitly clear: >> >> >> O bit: Setting this bit indicates an Operations, Administration, and >> Maintenance (OAM) packet. The actual packet format and processing of >> SFC OAM messages is outside the scope of this specification (see >> [I-D.ietf-sfc-oam-framework]). >> >> + The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM >> + packets. The O-bit MUST NOT be modified along the SFP. >> + >> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >> OAM procedures SHOULD discard packets with O-bit set, but MAY support >> a configurable parameter to enable forwarding received SFC OAM >> packets unmodified to the next element in the chain. Forwarding OAM >> packets unmodified by SFC elements that do not support SFC OAM >> procedures may be acceptable for a subset of OAM functions, but can >> result in unexpected outcomes for others, thus it is recommended to >> analyze the impact of forwarding an OAM packet for all OAM functions >> prior to enabling this behavior. The configurable parameter MUST be >> disabled by default. >> >> - The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM >> - packets. The O-bit MUST NOT be modified along the SFP. >> - >> >> Thoughts on this proposal? It seems to achieve the right balance of >> not over specify but bring clarity. >> >> Thanks, >> >> — Carlos. >> >> >>> On Jul 6, 2017, at 10:07 PM, Greg Mirsky >> > wrote: >>> >>> Hi Jim, >>> I can give my interpretation of what Carlos had proposed and how his >>> clarification may be reflected in the document: >>> OLD: >>> O bit: Setting this bit indicates an Operations, Administration, and >>> Maintenance (OAM) packet. The actual packet format and processing of >>> SFC OAM messages is outside the scope of this specification (see >>> [oam-frame]). >>> NEW: >>> O bit: Setting this bit indicates an Operations, Administration, and >>> Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM >>> payload immediately following NSH. In all other cases, i.e. when the >>> payload is not OAM, the O-bit MUST be reset. The actual packet format >>> and processing of SFC OAM messages are outside the scope of this >>> specification (see [oam-frame]). >>> Regards, >>> Greg >>> >>> On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard >>> > wrote: >>> >>> Hi Greg/Carlos,____ >>> >>> __ __ >>> >>> It is difficult to tell from this thread whether a textual change >>> is being proposed or if the current text is sufficient; please >>> can you clarify for the WG and if a textual change is being >>> proposed please clearly state what this is so that the WG can >>> evaluate and we can move forward.____ >>> >>> __ __ >>> >>> Many thanks!____ >>> >>> __ __ >>> >>> Jim____ >>> >>> __ __ >>> >>> *From:*sfc [mailto:sfc-bounces@ietf.org >>> ] *On Behalf Of *Greg Mirsky >>> *Sent:* Tuesday, July 04, 2017 1:41 AM >>> *To:* Carlos Pignataro (cpignata) >> > >>> *Cc:* Joel M. Halpern >> >; Andrew G. Malis >> >; sfc@ietf.org >>> *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting >>> at IETF 99 in Prague]____ >>> >>> __ __ >>> >>> Hi Carlos,____ >>> >>> you have valid interpretation of the text in its current version. >>> And I think that if it was in the document as you have presented >>> (or very close to it), it would address my concern, as you've >>> provided clear and unambiguous definition of what considered as >>> OAM packet in SFC - packet that carries OAM information as >>> payload that immediately follows the NSH.____ >>> >>> __ __ >>> >>> Regards,____ >>> >>> Greg____ >>> >>> __ __ >>> >>> On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) >>> > wrote:____ >>> >>> Hi Andy, ____ >>> >>> __ __ >>> >>> I believe that s/packet/information/ can actually cause more >>> confusion that bring clarity.____ >>> >>> __ __ >>> >>> O=0 means that the payload is a user packet. O=1 means the >>> payload is an OAM packet. ____ >>> >>> __ __ >>> >>> However, this is independent of the Metadata, since some >>> Metadata can be OAM-ish (as a timestamp). And this is also >>> independent of a NULL payload as in Adrian’s draft.____ >>> >>> __ __ >>> >>> A user packet with OAM-ish metadata will have O=0.____ >>> >>> __ __ >>> >>> The text can always be polished more — I am not sure if we >>> might be in diminishing return territory.____ >>> >>> __ __ >>> >>> (I would not oppose a clarification that speaks to the >>> metadata independence of O for user packets, although maybe >>> that does belong in other documents)____ >>> >>> __ __ >>> >>> Thanks!____ >>> >>> __ __ >>> >>> Carlos.____ >>> >>> __ __ >>> >>> On Jul 1, 2017, at 5:26 PM, Andrew G. Malis >>> > wrote:____ >>> >>> __ __ >>> >>> Joel, ____ >>> >>> __ __ >>> >>> I would like to suggest changing:____ >>> >>> __ __ >>> >>> O bit: Setting this bit indicates an Operations, >>> Administration, and >>> Maintenance (OAM) packet. The actual packet format >>> and processing of >>> SFC OAM messages is outside the scope of this >>> specification (see >>> [oam-frame]).____ >>> >>> __ __ >>> >>> to:____ >>> >>> __ __ >>> >>> O bit: Setting this bit indicates the presence of >>> Operations, Administration, and >>> Maintenance (OAM) information. The actual OAM >>> information format and processing____ >>> >>> is outside the scope of this specification (see >>> [oam-frame]).____ >>> >>> __ __ >>> >>> __ __ >>> >>> The reason for this change is that we don’t yet know if >>> the format of OAM information, and whether it will be in >>> metadata, packet contents, or both. Thus, we don’t yet >>> even know if there will be “OAM packets†per se, as data >>> packets could possibly also carry OAM information in the >>> metadata.____ >>> >>> __ __ >>> >>> If this change is acceptable, then the following two >>> paragraphs should also be amended to:____ >>> >>> __ __ >>> >>> SF/SFF/SFC Proxy/Classifer implementations that do not >>> support SFC >>> OAM procedures SHOULD discard packets with O bit set, >>> but MAY support >>> a configurable parameter to enable forwarding received >>> packets with the O bit____ >>> >>> set unmodified to the next element in the chain. >>> Forwarding >>> packets with the O bit set unmodified by SFC elements >>> that do not support SFC OAM >>> procedures may be acceptable for a subset of OAM >>> functions, but can >>> result in unexpected outcomes for others, thus it is >>> recommended to >>> analyze the impact of forwarding a packet with the O >>> bit set for all OAM functions >>> prior to enabling this behavior. The configurable >>> parameter MUST be >>> disabled by default. >>> >>> The O bit MUST be set for packets containing OAM >>> information and MUST NOT be set for >>> packets without OAM information. The O bit MUST NOT >>> be modified along the SFP.____ >>> >>> __ __ >>> >>> __ __ >>> >>> Finally, I’ve seen both “O bit†and O-bit†used in the >>> document. The document should choose one.____ >>> >>> __ __ >>> >>> Thanks,____ >>> >>> Andy____ >>> >>> __ __ >>> >>> __ __ >>> >>> On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern >>> > wrote:____ >>> >>> The definition of the O bit in the document is: >>> >>> O bit: Setting this bit indicates an Operations, >>> Administration, and >>> Maintenance (OAM) packet. The actual packet >>> format and processing of >>> SFC OAM messages is outside the scope of this >>> specification (see >>> [oam-frame]). >>> >>> SF/SFF/SFC Proxy/Classifer implementations that do >>> not support SFC >>> OAM procedures SHOULD discard packets with O-bit >>> set, but MAY support >>> a configurable parameter to enable forwarding >>> received SFC OAM >>> packets unmodified to the next element in the >>> chain. Forwarding OAM >>> packets unmodified by SFC elements that do not >>> support SFC OAM >>> procedures may be acceptable for a subset of OAM >>> functions, but can >>> result in unexpected outcomes for others, thus it >>> is recommended to >>> analyze the impact of forwarding an OAM packet for >>> all OAM functions >>> prior to enabling this behavior. The configurable >>> parameter MUST be >>> disabled by default. >>> >>> The O-bit MUST be set for OAM packets and MUST NOT >>> be set for non-OAM >>> packets. The O-bit MUST NOT be modified along the >>> SFP. >>> >>> This seems to me a VERY clear description of when the >>> bit is to be set, and what handling is required when >>> packets with this bit are received at an NSH support >>> entity. >>> >>> If you consider this wording unclear, please propose >>> specific text to improve it. >>> >>> Yours, >>> Joel >>> >>> On 7/1/17 5:02 PM, Greg Mirsky wrote:____ >>> >>> Hi Joel, >>> by all means, I'm not asking to hold NSH document >>> until SFC OAM solutions progress. But NSH refers >>> to OAM packet and, in my view, it is too >>> ambiguous term. Please consider, OAM packet may be: >>> >>> * control message of active SFC OAM protocol >>> carried as payload; >>> * control message of active SFC OAM protocol >>> carried as metadata; >>> * control information and/or measurement >>> results of hybrid SFC OAM >>> protocol carried as metadata >>> >>> If work on OAM framework is progressing, perhaps >>> all the OAM related discussion as well as >>> allocation of the O-bit itself can be moved there. >>> >>> As co-author of several SFC OAM drafts I'd note >>> that none of them has dependency on where OAM >>> information must be placed, metadata or payload. >>> But clear and unambiguous definitionsof OAM >>> packet and interpretation of O-bit are very much >>> needed and will help to progress SFC OAM solutions. >>> >>> Regards, >>> Greg____ >>> >>> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern >>> >>> >> >> wrote: >>> >>> Greg, the editors are working on the revision >>> of the OAM Framework >>> document. >>> >>> >>> More importantly, we have been careful that >>> the NSH document does >>> not normatively depend upon the OAM >>> specification. This was >>> discussed with the working group several >>> times, and the OAM wording >>> in -13 is the result of that discussion. >>> >>> >>> Are you really asking that we hold up RFC >>> publication of the NSH >>> document until we have agreement on all of >>> the complex OAM issues >>> (such as in-situ, etc.) I observe a steady >>> rate of new OAM >>> proposals, with new behaviors. That seems to >>> indicate that such >>> ahold-up would be almost indefinite. >>> >>> >>> Yours, >>> Joel M. Halpern >>> >>> On 7/1/17 3:39 PM, Greg Mirsky wrote: >>> >>> Hi Joel, Adrian, et. al, >>> you'd expect that I'll look into OAM bit >>> and wording on OAM >>> packet first. And so I had. I'm concerned >>> that NSH refers to >>> expired and, frankly, stalled document >>> that had not been >>> discussed for too long. I believe the NSH >>> document should have >>> or refer to clear definition of SFC OAM >>> packet before it defines >>> interpretation of O-bit flag. >>> draft-farrel-sfc-convent correctly >>> points that in current form O-bit >>> indicates presence of OAM >>> information which can be either as >>> metadata or as payload. I >>> believe that we must have more clear and >>> deterministic >>> definition of OAM packet as current, in >>> my opinion, may cause >>> problems for HW-based SFC OAM support. >>> >>> Regards, >>> Greg >>> >>> On Thu, Jun 29, 2017 at 4:22 PM, Joel >>> Halpern Direct >>> >> >>> >> >____ >>> >>> >> >>> >> >>> wrote: >>> >>> The -13 will be out in a few days >>> with all the changes. >>> That is what we will ask the WG to >>> review. >>> If we already had it out, we would >>> have already asked for >>> the WG to >>> take a last look. >>> >>> Yours, >>> Joel >>> >>> >>> On 6/29/17 7:21 PM, Greg Mirsky wrote: >>> >>> Hi Joel, >>> is the -12 the latest published >>> version of the NSH >>> draft? As I >>> see, it is missing TTL and all >>> related changes: >>> >>> >>> >>> >>> >>> _______________________________________________ >>> sfc mailing list >>> sfc@ietf.org >>> > >>> https://www.ietf.org/mailman/listinfo/sfc >>> >>> >>> >> > >>> >>> ____ >>> >>> >>> _______________________________________________ >>> sfc mailing list >>> sfc@ietf.org >>> https://www.ietf.org/mailman/listinfo/sfc >>> ____ >>> >>> __ __ >>> >>> _______________________________________________ >>> sfc mailing list >>> sfc@ietf.org >>> https://www.ietf.org/mailman/listinfo/sfc >>> ____ >>> >>> __ __ >>> >>> —____ >>> >>> Carlos Pignataro, carlos@cisco.com >>> >>> /“Sometimes I use big words that I do not fully understand, >>> to make myself sound more photosynthesis."/____ >>> >>> __ __ >>> >>> __ __ >>> >>> >> >> — >> Carlos Pignataro, carlos@cisco.com >> >> /“Sometimes I use big words that I do not fully understand, to make >> myself sound more photosynthesis."/ >> > > — > Carlos Pignataro, carlos@cisco.com > > /“Sometimes I use big words that I do not fully understand, to make > myself sound more photosynthesis."/ > From nobody Thu Jul 6 20:53:15 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B4051286D6 for ; Thu, 6 Jul 2017 20:53:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zBlA2RwHQHef for ; Thu, 6 Jul 2017 20:53:09 -0700 (PDT) Received: from mail-qt0-x22a.google.com (mail-qt0-x22a.google.com [IPv6:2607:f8b0:400d:c0d::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7845B127137 for ; Thu, 6 Jul 2017 20:53:09 -0700 (PDT) Received: by mail-qt0-x22a.google.com with SMTP id b40so18229522qtb.2 for ; Thu, 06 Jul 2017 20:53:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=ZjRi9Dr2QGzH8ZYmuFz3iomsKpvI8Xn5Xwt9vjd4nss=; b=M3nwys1zRO0vkHxy+vJQ4bmK4Bm74Vt5lYKP/JRZhl4v8mdJ2glUzH9zmZZiJpiyMl O92lRVXkkT0XEoHFxUtj+tWxH2V/n6/ZsrOCndusLHoZy0btCyCkEch/gctBJF7Cm2zK /hIgzVP32PINqUEND2Urzc3AFahbZffMAIw6+YnEyeVe7YPTye5mYnUr61OckOcFAgQi EMCyd5jJsxSKJ6BXSKG6PUq7oVFeqTaUviYvzFP6Cd6MMS/PvtV/H+ouLDMPtyWY+U07 erPf8AHv8hDJZYjaq1OlVYiZmkZSFvOWQLVZKqqB3ueKNyQYqm91UNrzRn6Et1xNLhWF ILuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=ZjRi9Dr2QGzH8ZYmuFz3iomsKpvI8Xn5Xwt9vjd4nss=; b=K9xX6wf3U3F4L1rzqBt0xAKy1OgKtToHhtUgSsDnUWAe7RFVIuVEzTHqS06btidNWF o2J3O7RJ4LQrnyLrN87/gPXRvWdvDdyORpl6x9cRDPnumEOSmmLJmKfSzMQfiQmMvdBN F6ZJCiwRSXqu6626LqCCVhB+e8iIEDg5Aa9GmTZFPJr055g67F11hOqqCWOO75e4b6ED 6bAxq3VONnU2Ez82LqMF1m2pb9xRe38Y6UySm+8iDFQxWH/gYFKSl5b5EVaqzP2JAQ51 q+Ita8zKfqUPIzR847NTz+7DeN0jANAN/ndFem+FGkC3KMg+aKrrP38RifO6kIeqSASx u8Rw== X-Gm-Message-State: AKS2vOz+7wOxzA54P93P2oNeQU6pC1DHw1ajDkDdz1dIRScY1K6gqo9D DZA4negFrBu8dHWjtK9P33P5kJmZQQ== X-Received: by 10.200.50.249 with SMTP id a54mr63646305qtb.91.1499399588518; Thu, 06 Jul 2017 20:53:08 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Thu, 6 Jul 2017 20:53:07 -0700 (PDT) In-Reply-To: <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> From: Greg Mirsky Date: Thu, 6 Jul 2017 20:53:07 -0700 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: Dave Dolson , "Joel M. Halpern" , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Content-Type: multipart/alternative; boundary="001a113c25cad9a2320553b22b52" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 03:53:13 -0000 --001a113c25cad9a2320553b22b52 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, thank you for clarification. Andy and I had pointed that the NSH document doesn't provide definition of OAM packet and thus use of O-bit is unclear. In your earlier mail you've mentioned that SFC OAM packet is the packet with OAM payload (that could be control message or measurement results). If you believe that the current wording on O-bit should not be changed to provide the definition of SFC OAM packet, then I support adoption of the text proposed by Andy Malis. Regards, Greg On Thu, Jul 6, 2017 at 8:24 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Correct practically =E2=80=94 zero for user packets. > > And I believe that=E2=80=99s what this says (using more words): > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [I-D.ietf-sfc-oam-framework]). > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > > Thanks, > > =E2=80=94 Carlos. > > On Jul 6, 2017, at 11:20 PM, Dave Dolson wrote: > > Practically, "The O-bit MUST be zero." Until OAM for NSH is defined. > Isn't that where we are at? > > > > David Dolson > Sandvine > *From: *Carlos Pignataro (cpignata) > *Sent: *Thursday, July 6, 2017 11:14 PM > *To: *Greg Mirsky > *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org; James N Guichard > *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF > 99 in Prague] > > Thanks Greg and Jim. I would like to close on this item. > > For clarity, what you (Greg) are proposing is the addition of the > following text: > > =E2=80=9CSFC OAM packet is the packet that has OAM payload immediately fo= llowing > NSH. In all other cases, i.e. when the payload is not OAM, the O-bit MUS= T > be reset.=E2=80=9D > > And while at first glance it sounds like a potentially useful or at least > non-harmful addition, very similar text already exists one paragraph belo= w: > > =E2=80=9CThe O-bit MUST be set for OAM packets and MUST NOT be set for > non-OAM packets. The O-bit MUST NOT be modified along the SFP.=E2=80=9D > > I prefer to specify as little as possible of OAM here, since we are > already pointing to a spec that would detail this processing. Things like > =E2=80=9Cimmediately following=E2=80=9D can be specified in the OAM docum= ent. As it is now, > what O means is clear and aligns with what I wrote below. > > Additionally, I=E2=80=99d much rather not change the text that was worked= through > iterations and consensus. However, I suggest we can move up that sentence > one paragraph up to improve the flow and make it explicitly clear: > > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [I-D.ietf-sfc-oam-framework]). > > + The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > + packets. The O-bit MUST NOT be modified along the SFP. > + > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > OAM procedures SHOULD discard packets with O-bit set, but MAY support > a configurable parameter to enable forwarding received SFC OAM > packets unmodified to the next element in the chain. Forwarding OAM > packets unmodified by SFC elements that do not support SFC OAM > procedures may be acceptable for a subset of OAM functions, but can > result in unexpected outcomes for others, thus it is recommended to > analyze the impact of forwarding an OAM packet for all OAM functions > prior to enabling this behavior. The configurable parameter MUST be > disabled by default. > > - The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > - packets. The O-bit MUST NOT be modified along the SFP. > - > > Thoughts on this proposal? It seems to achieve the right balance of not > over specify but bring clarity. > > Thanks, > > =E2=80=94 Carlos. > > > On Jul 6, 2017, at 10:07 PM, Greg Mirsky wrote: > > Hi Jim, > I can give my interpretation of what Carlos had proposed and how his > clarification may be reflected in the document: > OLD: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual packet format and processing of > SFC OAM messages is outside the scope of this specification (see > [oam-frame]). > > NEW: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM p= ayload immediately following NSH. In all other cases, i.e. when the payloa= d is not OAM, the O-bit MUST be reset. The actual packet format and process= ing of SFC OAM messages are outside the scope of this specification (see [o= am-frame]). > > Regards, > > Greg > > > On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard < > james.n.guichard@huawei.com> wrote: > >> Hi Greg/Carlos, >> >> >> >> It is difficult to tell from this thread whether a textual change is >> being proposed or if the current text is sufficient; please can you clar= ify >> for the WG and if a textual change is being proposed please clearly stat= e >> what this is so that the WG can evaluate and we can move forward. >> >> >> >> Many thanks! >> >> >> >> Jim >> >> >> >> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Greg Mirsky >> *Sent:* Tuesday, July 04, 2017 1:41 AM >> *To:* Carlos Pignataro (cpignata) >> *Cc:* Joel M. Halpern ; Andrew G. Malis < >> agmalis@gmail.com>; sfc@ietf.org >> *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF >> 99 in Prague] >> >> >> >> Hi Carlos, >> >> you have valid interpretation of the text in its current version. And I >> think that if it was in the document as you have presented (or very clos= e >> to it), it would address my concern, as you've provided clear and >> unambiguous definition of what considered as OAM packet in SFC - packet >> that carries OAM information as payload that immediately follows the NSH= . >> >> >> >> Regards, >> >> Greg >> >> >> >> On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >> Hi Andy, >> >> >> >> I believe that s/packet/information/ can actually cause more confusion >> that bring clarity. >> >> >> >> O=3D0 means that the payload is a user packet. O=3D1 means the payload i= s an >> OAM packet. >> >> >> >> However, this is independent of the Metadata, since some Metadata can be >> OAM-ish (as a timestamp). And this is also independent of a NULL payload= as >> in Adrian=E2=80=99s draft. >> >> >> >> A user packet with OAM-ish metadata will have O=3D0. >> >> >> >> The text can always be polished more =E2=80=94 I am not sure if we might= be in >> diminishing return territory. >> >> >> >> (I would not oppose a clarification that speaks to the metadata >> independence of O for user packets, although maybe that does belong in >> other documents) >> >> >> >> Thanks! >> >> >> >> Carlos. >> >> >> >> On Jul 1, 2017, at 5:26 PM, Andrew G. Malis wrote: >> >> >> >> Joel, >> >> >> >> I would like to suggest changing: >> >> >> >> O bit: Setting this bit indicates an Operations, Administration, and >> Maintenance (OAM) packet. The actual packet format and processing of >> SFC OAM messages is outside the scope of this specification (see >> [oam-frame]). >> >> >> >> to: >> >> >> >> O bit: Setting this bit indicates the presence of Operations, >> Administration, and >> Maintenance (OAM) information. The actual OAM information format and >> processing >> >> is outside the scope of this specification (see [oam-frame]). >> >> >> >> >> >> The reason for this change is that we don=E2=80=99t yet know if the form= at of OAM >> information, and whether it will be in metadata, packet contents, or >> both. Thus, we don=E2=80=99t yet even know if there will be =E2=80=9COAM= packets=E2=80=9D per se, >> as data packets could possibly also carry OAM information in the metadat= a. >> >> >> >> If this change is acceptable, then the following two paragraphs should >> also be amended to: >> >> >> >> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >> OAM procedures SHOULD discard packets with O bit set, but MAY support >> a configurable parameter to enable forwarding received packets with >> the O bit >> >> set unmodified to the next element in the chain. Forwarding >> packets with the O bit set unmodified by SFC elements that do not >> support SFC OAM >> procedures may be acceptable for a subset of OAM functions, but can >> result in unexpected outcomes for others, thus it is recommended to >> analyze the impact of forwarding a packet with the O bit set for all >> OAM functions >> prior to enabling this behavior. The configurable parameter MUST be >> disabled by default. >> >> The O bit MUST be set for packets containing OAM information and MUST >> NOT be set for >> packets without OAM information. The O bit MUST NOT be modified alon= g >> the SFP. >> >> >> >> >> >> Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D and O-bit=E2=80= =9D used in the document. The >> document should choose one. >> >> >> >> Thanks, >> >> Andy >> >> >> >> >> >> On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern >> wrote: >> >> The definition of the O bit in the document is: >> >> O bit: Setting this bit indicates an Operations, Administration, and >> Maintenance (OAM) packet. The actual packet format and processing of >> SFC OAM messages is outside the scope of this specification (see >> [oam-frame]). >> >> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >> OAM procedures SHOULD discard packets with O-bit set, but MAY support >> a configurable parameter to enable forwarding received SFC OAM >> packets unmodified to the next element in the chain. Forwarding OAM >> packets unmodified by SFC elements that do not support SFC OAM >> procedures may be acceptable for a subset of OAM functions, but can >> result in unexpected outcomes for others, thus it is recommended to >> analyze the impact of forwarding an OAM packet for all OAM functions >> prior to enabling this behavior. The configurable parameter MUST be >> disabled by default. >> >> The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM >> packets. The O-bit MUST NOT be modified along the SFP. >> >> This seems to me a VERY clear description of when the bit is to be set, >> and what handling is required when packets with this bit are received at= an >> NSH support entity. >> >> If you consider this wording unclear, please propose specific text to >> improve it. >> >> Yours, >> Joel >> >> On 7/1/17 5:02 PM, Greg Mirsky wrote: >> >> Hi Joel, >> by all means, I'm not asking to hold NSH document until SFC OAM solution= s >> progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous >> term. Please consider, OAM packet may be: >> >> * control message of active SFC OAM protocol carried as payload; >> * control message of active SFC OAM protocol carried as metadata; >> * control information and/or measurement results of hybrid SFC OAM >> protocol carried as metadata >> >> If work on OAM framework is progressing, perhaps all the OAM related >> discussion as well as allocation of the O-bit itself can be moved there. >> >> As co-author of several SFC OAM drafts I'd note that none of them has >> dependency on where OAM information must be placed, metadata or payload. >> But clear and unambiguous definitionsof OAM packet and interpretation of >> O-bit are very much needed and will help to progress SFC OAM solutions. >> >> Regards, >> Greg >> >> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern > > wrote: >> >> Greg, the editors are working on the revision of the OAM Framework >> document. >> >> >> More importantly, we have been careful that the NSH document does >> not normatively depend upon the OAM specification. This was >> discussed with the working group several times, and the OAM wording >> in -13 is the result of that discussion. >> >> >> Are you really asking that we hold up RFC publication of the NSH >> document until we have agreement on all of the complex OAM issues >> (such as in-situ, etc.) I observe a steady rate of new OAM >> proposals, with new behaviors. That seems to indicate that such >> ahold-up would be almost indefinite. >> >> >> Yours, >> Joel M. Halpern >> >> On 7/1/17 3:39 PM, Greg Mirsky wrote: >> >> Hi Joel, Adrian, et. al, >> you'd expect that I'll look into OAM bit and wording on OAM >> packet first. And so I had. I'm concerned that NSH refers to >> expired and, frankly, stalled document that had not been >> discussed for too long. I believe the NSH document should have >> or refer to clear definition of SFC OAM packet before it defines >> interpretation of O-bit flag. draft-farrel-sfc-convent correctly >> points that in current form O-bit indicates presence of OAM >> information which can be either as metadata or as payload. I >> believe that we must have more clear and deterministic >> definition of OAM packet as current, in my opinion, may cause >> problems for HW-based SFC OAM support. >> >> Regards, >> Greg >> >> On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct >> >> >> > >> wrote: >> >> The -13 will be out in a few days with all the changes. >> That is what we will ask the WG to review. >> If we already had it out, we would have already asked for >> the WG to >> take a last look. >> >> Yours, >> Joel >> >> >> On 6/29/17 7:21 PM, Greg Mirsky wrote: >> >> Hi Joel, >> is the -12 the latest published version of the NSH >> draft? As I >> see, it is missing TTL and all related changes: >> >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> >> >> >> =E2=80=94 >> >> Carlos Pignataro, carlos@cisco.com >> >> *=E2=80=9CSometimes I use big words that I do not fully understand, to m= ake >> myself sound more photosynthesis."* >> >> >> >> >> > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > --001a113c25cad9a2320553b22b52 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
thank you for clarification. Andy and I had= pointed that the NSH document doesn't provide definition of OAM packet= and thus use of O-bit is unclear. In your earlier mail you've mentione= d that SFC OAM packet is the packet with OAM payload (that could be control= message or measurement results). If you believe that the current wording o= n O-bit should not be changed to provide the definition of SFC OAM packet, = then I support adoption of the text proposed by Andy Malis.

<= /div>
Regards,
Greg
On Thu, Jul 6, 2017 at 8:24 PM, Carlos Pignatar= o (cpignata) <cpignata@cisco.com> wrote:
Correct practically =E2=80=94 zero for user packets.

And I believe that=E2=80=99s what this says (using more words):

=C2=A0 =C2=A0 O bit: Setting this bit indicates an Op= erations, Administration, and
=C2=A0 =C2=A0 Maintenance (OAM) packet.=C2=A0 The actual packet format and = processing of
=C2=A0 =C2=A0 SFC OAM messages is outside the scope of this specification (= see
=C2=A0 =C2=A0 [I-D.ietf-sfc-oam-framework]).
=C2=A0
 =C2=A0 =C2=A0 The O-bit MUST be set for OAM packets and MUST NOT be set for= non-OAM
=C2=A0 =C2=A0 packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.<= br>


Thanks,

=E2=80=94 Carlos.

On Jul 6, 2017, at 11:20 PM, Dave Dolson <ddolson@sandvine.com> wrote:

Practically, "The O-bit MUST be zero." Until OAM for NSH is defin= ed.
Isn't that where we are at?



David=C2=A0Dolson
Sandvine
From: Carlos Pignataro (cpignata)
Sent: Thursday, July 6, 2017 11:14 PM
To: Greg Mirsky
Cc: Joel M. Halpern; Andrew G. Malis; sfc@ietf.org; James N Guichard
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting a= t IETF 99 in Prague]

Thanks Greg and Jim. I would like to close on this item.

For clarity, what you (Greg) are proposing is the addition of the foll= owing text:

=E2=80=9CSFC OAM packet is the packet that has OAM payload immediately= following NSH.=C2=A0=C2=A0In all other cases, i.e. when the payload is not= OAM, the O-bit MUST be reset.=E2=80=9D

And while at first glance it sounds like a potentially useful or at le= ast non-harmful addition, very similar text already exists one paragraph be= low:

=E2=80=9CThe=C2=A0O-bit=C2=A0MUST be set for OAM packets and MUST NOT = be set for non-OAM=C2=A0packets.=C2=A0=C2=A0The=C2=A0O-bit=C2=A0MUST N= OT be modified along the SFP.=E2=80=9D

I prefer to specify as little as possible of OAM here, since we are al= ready pointing to a spec that would detail this processing. Things like =E2= =80=9Cimmediately following=E2=80=9D can be specified in the OAM document. = As it is now, what O means is clear and aligns with what I wrote below.

Additionally, I=E2=80=99d much rather not change the text that was wor= ked through iterations and consensus. However, I suggest we can move up tha= t sentence one paragraph up to improve the flow and make it explicitly clea= r:


=C2=A0 =C2=A0=C2=A0O bit: Setting this bit indicates an Operations, Ad= ministration, and
=C2=A0 =C2=A0=C2=A0Maintenance (OAM) packet.=C2=A0=C2=A0The actual packet f= ormat and processing of
=C2=A0 =C2=A0=C2=A0SFC OAM messages is outside the scope of this specificat= ion (see
=C2=A0 =C2=A0=C2=A0[I-D.ietf-sfc-oam-framework]).
=C2=A0
+=C2=A0=C2=A0=C2=A0The O-bit MUST be set for OAM packets and MUST NOT be se= t for non-OAM
+=C2=A0=C2=A0=C2=A0packets.=C2=A0=C2=A0The O-bit MUST NOT be modified along= the SFP.
+
=C2=A0 =C2=A0=C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not s= upport SFC
=C2=A0 =C2=A0=C2=A0OAM procedures SHOULD discard packets with O-bit set, bu= t MAY support
=C2=A0 =C2=A0=C2=A0a configurable parameter to enable forwarding received S= FC OAM
=C2=A0 =C2=A0=C2=A0packets unmodified to the next element in the chain.=C2= =A0=C2=A0Forwarding OAM
=C2=A0 =C2=A0=C2=A0packets unmodified by SFC elements that do not support S= FC OAM
=C2=A0 =C2=A0=C2=A0procedures may be acceptable for a subset of OAM functio= ns, but can
=C2=A0 =C2=A0=C2=A0result in unexpected outcomes for others, thus it is rec= ommended to
=C2=A0 =C2=A0=C2=A0analyze the impact of forwarding an OAM packet for all O= AM functions
=C2=A0 =C2=A0=C2=A0prior to enabling this behavior.=C2=A0=C2=A0The configur= able parameter MUST be
=C2=A0 =C2=A0=C2=A0disabled by default.
=C2=A0
-=C2=A0=C2=A0=C2=A0The O-bit MUST be set for OAM packets and MUST NOT be se= t for non-OAM
-=C2=A0=C2=A0=C2=A0packets.=C2=A0=C2=A0The O-bit MUST NOT be modified along= the SFP.
-

Thoughts on this proposal? It seems to achieve the right balance of no= t over specify but bring clarity.

Thanks,

=E2=80=94 Carlos.


On Jul 6, 2017, at 10:07 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Jim,
I can give my interpretation of what Carlos had proposed and how his c= larification may be reflected in the document:
OLD:
   O bit: Setting this bit indicate=
s an Operations, Administration, and
   Maintenance (OAM) packet.  The actual packet format and processing of
   SFC OAM messages is outside the scope of this specification (see
   [oam-frame]).
NEW:
   O bit: Set=
ting this bit indicates an Operations, Administration, and
   Maintenance (OAM) packet.  SFC OAM packet is the packet that has OAM pay=
load immediately following NSH.  In all other cases, i.e. when the payload =
is not OAM, the O-bit MUST be reset. The actual packet format and processin=
g of SFC OAM messages are outside the scope of this specification (see [oam=
-frame]).
Regards,
Greg

On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard= <james.= n.guichard@huawei.com> wrote:

Hi Greg/Carlos,<= /p>

=C2=A0

It is difficult to tell from this thr= ead whether a textual change is being proposed or if the current text is su= fficient; please can you clarify for the WG and if a textual change is being proposed please clearly state what= this is so that the WG can evaluate and we can move forward.=

=C2=A0

Many thanks!

=C2=A0

Jim

=C2=A0

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Greg Mirsky
Sent: Tuesday, July 04, 2017 1:41 AM
To: Carlos Pignataro (cpignata) <cpignata@cisco.com>
Cc: Joel M. Halpern <jmh@joelhalpern.com>; Andrew G. Malis <agmalis@gmail.com>; sfc@ietf.org
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IET= F 99 in Prague]

=C2=A0

Hi Carlos,

you have valid interpretation of the text in its cur= rent version. And I think that if it was in the document as you have presen= ted (or very close to it), it would address my concern, as you've provi= ded clear and unambiguous definition of what considered as OAM packet in SFC - packet that carries OAM information= as payload that immediately follows the NSH.

=C2=A0

Regards,

Greg

=C2=A0

On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cp= ignata) <cpignat= a@cisco.com> wrote:

Hi Andy,

=C2=A0

I believe that s/packet/information/ can actually ca= use more confusion that bring clarity.

=C2=A0

O=3D0 means that the payload is a user packet. O=3D1= means the payload is an OAM packet.=C2=A0

=C2=A0

However, this is independent of the Metadata, since = some Metadata can be OAM-ish (as a timestamp). And this is also independent= of a NULL payload as in Adrian=E2=80=99s draft.

=C2=A0

A user packet with OAM-ish metadata will have O=3D0.=

=C2=A0

The text can always be polished more =E2=80=94 I am = not sure if we might be in diminishing return territory.

=C2=A0

(I would not oppose a clarification that speaks to t= he metadata independence of O for user packets, although maybe that does be= long in other documents)

=C2=A0

Thanks!

=C2=A0

Carlos.<= /span>

=C2=A0

On Jul 1, 2017, at 5:26 PM, Andrew G. Malis <agmalis@gmail.com>= ; wrote:

=C2=A0

Joel,

=C2=A0

I would like to suggest changing:

=C2=A0

O bit: Setting this = bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC=C2=A0OAM messages is outside the sco= pe of this specification (see
=C2=A0 =C2=A0[oam-frame]).

=C2=A0

to:=

=C2=A0

O bit: Setting this = bit indicates the presence of Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) information.=C2=A0 The actual OAM informatio= n format and processing

=C2=A0 =C2=A0is outs= ide the scope of this specification (see=C2=A0 [oam-frame]).<= u>

=C2=A0

=C2=A0

The reason for this = change is that we don=E2=80=99t yet know if the format of OAM information, = and whether it will be in metadata, packet contents, or both.=C2=A0Thus, we= don=E2=80=99t yet even know if=C2=A0there will be=C2=A0=E2=80=9COAM packets=E2=80=9D per se, as data packets=C2=A0could possibly also carry OA= M=C2=A0information in the metadata.

=C2=A0

If=C2=A0this change = is acceptable, then the following two paragraphs should also be amended to:=

=C2=A0

=C2=A0 =C2=A0SF/SFF/= SFC=C2=A0Proxy/Classifer implementations that do not = support=C2=A0SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received packets= with the O bit

=C2=A0 =C2=A0set unm= odified to the next element in the chain.=C2=A0 Forwarding
=C2=A0 =C2=A0packets with the O bit set unmodified by=C2=A0S= FC=C2=A0elements that do not support=C2=A0SFC= =C2=A0OAM
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding a packet with the O bit set f= or all OAM functions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O bit MUST be set for packets containing OAM information a= nd MUST NOT be set for=C2=A0
=C2=A0 =C2=A0packets without OAM information.=C2=A0 The O bit MUST NOT be m= odified along the SFP.

=C2=A0

=C2=A0

Finally, I=E2=80=99v= e seen both=C2=A0=E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D used in the doc= ument.=C2=A0The document should choose one.

=C2=A0

Thanks,

Andy

=C2=A0

=C2=A0

On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern <= jmh@joelhalpern.co= m> wrote:

The definition of the O bit in the document is:

O bit: Setting this bit indicates an Operations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet format and p= rocessing of
=C2=A0 =C2=A0SFC OAM messages is outside the scope of this specification (s= ee
=C2=A0 =C2=A0[oam-frame]).

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifer implementations that do not support= SFC
=C2=A0 =C2=A0OAM procedures SHOULD discard packets with O-bit set, but MAY = support
=C2=A0 =C2=A0a configurable parameter to enable forwarding received SFC OAM=
=C2=A0 =C2=A0packets unmodified to the next element in the chain.=C2=A0 For= warding OAM
=C2=A0 =C2=A0packets unmodified by SFC elements that do not support SFC OAM=
=C2=A0 =C2=A0procedures may be acceptable for a subset of OAM functions, bu= t can
=C2=A0 =C2=A0result in unexpected outcomes for others, thus it is recommend= ed to
=C2=A0 =C2=A0analyze the impact of forwarding an OAM packet for all OAM fun= ctions
=C2=A0 =C2=A0prior to enabling this behavior.=C2=A0 The configurable parame= ter MUST be
=C2=A0 =C2=A0disabled by default.

=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM
=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.
This seems to me a VERY clear description of when the bit is to be set, and= what handling is required when packets with this bit are received at an NS= H support entity.

If you consider this wording unclear, please propose specific text to impro= ve it.

Yours,
Joel

On 7/1/17 5:02 PM, Greg Mirsky wrote:

Hi Joel,
by all means, I'm not asking to hold NSH document until SFC OAM solutio= ns progress. But NSH refers to OAM packet and, in my view, it is too ambigu= ous term. Please consider, OAM packet may be:

=C2=A0 * control message of active SFC OAM protocol carried as payload;
=C2=A0 * control message of active SFC OAM protocol carried as metadata; =C2=A0 * control information and/or measurement results of hybrid SFC OAM =C2=A0 =C2=A0 protocol carried as metadata

If work on OAM framework is progressing, perhaps all the OAM related discus= sion as well as allocation of the O-bit itself can be moved there.

As co-author of several SFC OAM drafts I'd note that none of them has d= ependency on where OAM information must be placed, metadata or payload. But= clear and unambiguous definitionsof OAM packet and interpretation of O-bit= are very much needed and will help to progress SFC OAM solutions.

Regards,
Greg

On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern <= jmh@joelhalpern.co= m <mailto:j= mh@joelhalpern.com>> wrote:

=C2=A0 =C2=A0 Greg, the editors are working on the revision of the OAM Fram= ework
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 More importantly, we have been careful that the NSH document = does
=C2=A0 =C2=A0 not normatively depend upon the OAM specification.=C2=A0 This= was
=C2=A0 =C2=A0 discussed with the working group several times, and the OAM w= ording
=C2=A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 Are you really asking that we hold up RFC publication of the = NSH
=C2=A0 =C2=A0 document until we have agreement on all of the complex OAM is= sues
=C2=A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady rate of new = OAM
=C2=A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to indicate t= hat such
=C2=A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bi= t and wording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned t= hat NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document that had= not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM packet = before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag. draft-farrel-sfc-= convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit indicates pre= sence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as metadata or = as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and determ= inistic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in my opin= ion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern D= irect
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern<= wbr>.com>

=C2=A0 =C2=A0 =C2=A0 = =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com>>>= wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a fe= w days with all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask th= e WG to review.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, w= e would have already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mi= rsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 th= e latest published version of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is mi= ssing TTL and all related changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 __________________________________________= _____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
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=C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailman/listinfo/sfc= >


_______________________________________________
sfc mailing list
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htt= ps://www.ietf.org/mailman/listinfo/sfc

=C2=A0

_______________________________________________=
sfc mailing list
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htt= ps://www.ietf.org/mailman/listinfo/sfc

=C2=A0

=E2=80=94

Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."

=C2=A0

=C2=A0



=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


--001a113c25cad9a2320553b22b52-- From nobody Thu Jul 6 20:59:21 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 01EF5129AB0 for ; Thu, 6 Jul 2017 20:59:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 34tIDobUQWt9 for ; Thu, 6 Jul 2017 20:59:15 -0700 (PDT) Received: from mail-qk0-x236.google.com (mail-qk0-x236.google.com [IPv6:2607:f8b0:400d:c09::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 373C7128B91 for ; Thu, 6 Jul 2017 20:59:12 -0700 (PDT) Received: by mail-qk0-x236.google.com with SMTP id 16so18458627qkg.2 for ; Thu, 06 Jul 2017 20:59:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=x30UGNBm/a/7R0Oqs2pi8BNknpgCnmH70Hah36WZDrk=; b=sQIbj1MEDXJtnklHDvH1jpN3qxTfyzxBlXc53ckSSmEhG70XUqw9ceqrzuNklNEPeB BQ/5aXFJm9nqZAiBXMwIQ7P+0yhDOzgBXtrRdm3IVun4Z+0XsB5a8D/7XvmTVUKehlVM RVdpKU607TePK5f3WSBhRy+aPdEBbRYzTU/racZwohA2CcQ7o6FolraZeWQC0IJKkYM1 /wMYkAUfvT8egaH3kTH4glVpg1ruwwdm7khEnlDfQ//eQN9AhBjjzNDB7lzEwAIEqkJS bk0b9h9cz6sPcJtAAGF8/9hMTlMtYqocTGKFAans8boF+M+4pSM4LMwZnO1nZibmQ2LE 6tAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=x30UGNBm/a/7R0Oqs2pi8BNknpgCnmH70Hah36WZDrk=; b=k3vfjNzjFyKvsNcvPN4F3MI3BbRANOUhTinnZs3Aa8Nr6hwyn6HToP6EzuNQY7FvxK 9SCiFKKpe7fENddi3s5VnmChZc6cid0tTXEB/q43U0xHiBjnIbxV/9yGlkRc4jKBA5kP GrGRP65oA7P4wAzDthIzhqn30ZJAW52G2fVi8CKx0rnJKag7xmZIJSPO1V34YhE1Ws25 jrbCQtV32lv+GNEEcm2H+k30B+ovAa+Oe3giG63IqDm9PVLttk2w4+5z5Me3cvSv0am3 3JivALMfCpfx7HoJdAGcIEu/Gz4l5fbUvsZewVGDZl9zGTZAcCBXahL/VsmkPn05yr6A Y6vA== X-Gm-Message-State: AKS2vOxOeh2Jj60YmJTXLuuCBayZ+q/lwTDxq5WFnFId1qB33cJLyMEX p7JLlqa+KWEgKMzFq0pVQmBDpJDkjA== X-Received: by 10.55.155.141 with SMTP id d135mr59923843qke.11.1499399951253; Thu, 06 Jul 2017 20:59:11 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Thu, 6 Jul 2017 20:59:10 -0700 (PDT) In-Reply-To: <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> From: Greg Mirsky Date: Thu, 6 Jul 2017 20:59:10 -0700 Message-ID: To: "Joel M. Halpern" Cc: "Carlos Pignataro (cpignata)" , Dave Dolson , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Content-Type: multipart/alternative; boundary="94eb2c07684a78871c0553b24114" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 03:59:19 -0000 --94eb2c07684a78871c0553b24114 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Joel, considering that we have active and hybrid OAM mechanisms under discussion, the clear definition of what SFC OAM packet must be, in my view, in the NSH document. I, for one, will support the definition of SFC OAM packet as active OAM packet that is specifically generated for OAM purpose and whose scope is limited by the SFC domain. Regards, Greg On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Halpern wrote= : > The current text says rather more than just "the O bit must be zero". It > prescribes what behavior should be implemented in NSH devices for > processing packets where the O bit is set. Which we were specifically > asked to provide. > > Speaking personally, I prefer that the OAM text in the NSH document not > specify where the OAM information is carried. While some folks have > assumptions about where the information will reside, we have not agreed o= n > that. > > Yours, > Joel > > On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote: > >> Correct practically =E2=80=94 zero for user packets. >> >> And I believe that=E2=80=99s what this says (using more words): >> >> O bit: Setting this bit indicates an Operations, Administration, an= d >> Maintenance (OAM) packet. The actual packet format and processing = of >> SFC OAM messages is outside the scope of this specification (see >> [I-D.ietf-sfc-oam-framework]). >> >> The O-bit MUST be set for OAM packets and MUST NOT be set for non-O= AM >> packets. The O-bit MUST NOT be modified along the SFP. >> >> >> Thanks, >> >> =E2=80=94 Carlos. >> >> On Jul 6, 2017, at 11:20 PM, Dave Dolson >> ddolson@sandvine.com>> wrote: >>> >>> Practically, "The O-bit MUST be zero." Until OAM for NSH is defined. >>> Isn't that where we are at? >>> >>> >>> >>> David Dolson >>> Sandvine >>> *From: *Carlos Pignataro (cpignata) >>> *Sent: *Thursday, July 6, 2017 11:14 PM >>> *To: *Greg Mirsky >>> *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org >> sfc@ietf.org>; James N Guichard >>> *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF >>> 99 in Prague] >>> >>> >>> >>> Thanks Greg and Jim. I would like to close on this item. >>> >>> For clarity, what you (Greg) are proposing is the addition of the >>> following text: >>> >>> =E2=80=9CSFC OAM packet is the packet that has OAM payload immediately = following >>> NSH. In all other cases, i.e. when the payload is not OAM, the O-bit M= UST >>> be reset.=E2=80=9D >>> >>> And while at first glance it sounds like a potentially useful or at >>> least non-harmful addition, very similar text already exists one paragr= aph >>> below: >>> >>> =E2=80=9CThe O-bit MUST be set for OAM packets and MUST NOT be set for = non-OAM >>> packets. The O-bit MUST NOT be modified along the SFP.=E2=80=9D >>> >>> I prefer to specify as little as possible of OAM here, since we are >>> already pointing to a spec that would detail this processing. Things li= ke >>> =E2=80=9Cimmediately following=E2=80=9D can be specified in the OAM doc= ument. As it is now, >>> what O means is clear and aligns with what I wrote below. >>> >>> Additionally, I=E2=80=99d much rather not change the text that was work= ed >>> through iterations and consensus. However, I suggest we can move up tha= t >>> sentence one paragraph up to improve the flow and make it explicitly cl= ear: >>> >>> >>> O bit: Setting this bit indicates an Operations, Administration, an= d >>> Maintenance (OAM) packet. The actual packet format and processing = of >>> SFC OAM messages is outside the scope of this specification (see >>> [I-D.ietf-sfc-oam-framework]). >>> >>> + The O-bit MUST be set for OAM packets and MUST NOT be set for non-O= AM >>> + packets. The O-bit MUST NOT be modified along the SFP. >>> + >>> SF/SFF/SFC Proxy/Classifer implementations that do not support SFC >>> OAM procedures SHOULD discard packets with O-bit set, but MAY suppo= rt >>> a configurable parameter to enable forwarding received SFC OAM >>> packets unmodified to the next element in the chain. Forwarding OA= M >>> packets unmodified by SFC elements that do not support SFC OAM >>> procedures may be acceptable for a subset of OAM functions, but can >>> result in unexpected outcomes for others, thus it is recommended to >>> analyze the impact of forwarding an OAM packet for all OAM function= s >>> prior to enabling this behavior. The configurable parameter MUST b= e >>> disabled by default. >>> >>> - The O-bit MUST be set for OAM packets and MUST NOT be set for non-O= AM >>> - packets. The O-bit MUST NOT be modified along the SFP. >>> - >>> >>> Thoughts on this proposal? It seems to achieve the right balance of not >>> over specify but bring clarity. >>> >>> Thanks, >>> >>> =E2=80=94 Carlos. >>> >>> >>> On Jul 6, 2017, at 10:07 PM, Greg Mirsky >>> gregimirsky@gmail.com>> wrote: >>>> >>>> Hi Jim, >>>> I can give my interpretation of what Carlos had proposed and how his >>>> clarification may be reflected in the document: >>>> OLD: >>>> O bit: Setting this bit indicates an Operations, Administration, and >>>> Maintenance (OAM) packet. The actual packet format and processing of S= FC >>>> OAM messages is outside the scope of this specification (see [oam-fram= e]). >>>> NEW: >>>> O bit: Setting this bit indicates an Operations, Administration, and >>>> Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM pa= yload >>>> immediately following NSH. In all other cases, i.e. when the payload i= s not >>>> OAM, the O-bit MUST be reset. The actual packet format and processing = of >>>> SFC OAM messages are outside the scope of this specification (see >>>> [oam-frame]). >>>> Regards, >>>> Greg >>>> >>>> On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard < >>>> james.n.guichard@huawei.com > >>>> wrote: >>>> >>>> Hi Greg/Carlos,____ >>>> >>>> __ __ >>>> >>>> It is difficult to tell from this thread whether a textual change >>>> is being proposed or if the current text is sufficient; please >>>> can you clarify for the WG and if a textual change is being >>>> proposed please clearly state what this is so that the WG can >>>> evaluate and we can move forward.____ >>>> >>>> __ __ >>>> >>>> Many thanks!____ >>>> >>>> __ __ >>>> >>>> Jim____ >>>> >>>> __ __ >>>> >>>> *From:*sfc [mailto:sfc-bounces@ietf.org >>>> ] *On Behalf Of *Greg Mirsky >>>> *Sent:* Tuesday, July 04, 2017 1:41 AM >>>> *To:* Carlos Pignataro (cpignata) >>> > >>>> *Cc:* Joel M. Halpern >>> >; Andrew G. Malis >>> >; sfc@ietf.org >>>> *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting >>>> at IETF 99 in Prague]____ >>>> >>>> __ __ >>>> >>>> Hi Carlos,____ >>>> >>>> you have valid interpretation of the text in its current version. >>>> And I think that if it was in the document as you have presented >>>> (or very close to it), it would address my concern, as you've >>>> provided clear and unambiguous definition of what considered as >>>> OAM packet in SFC - packet that carries OAM information as >>>> payload that immediately follows the NSH.____ >>>> >>>> __ __ >>>> >>>> Regards,____ >>>> >>>> Greg____ >>>> >>>> __ __ >>>> >>>> On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) >>>> > wrote:____ >>>> >>>> Hi Andy, ____ >>>> >>>> __ __ >>>> >>>> I believe that s/packet/information/ can actually cause more >>>> confusion that bring clarity.____ >>>> >>>> __ __ >>>> >>>> O=3D0 means that the payload is a user packet. O=3D1 means the >>>> payload is an OAM packet. ____ >>>> >>>> __ __ >>>> >>>> However, this is independent of the Metadata, since some >>>> Metadata can be OAM-ish (as a timestamp). And this is also >>>> independent of a NULL payload as in Adrian=E2=80=99s draft.___= _ >>>> >>>> __ __ >>>> >>>> A user packet with OAM-ish metadata will have O=3D0.____ >>>> >>>> __ __ >>>> >>>> The text can always be polished more =E2=80=94 I am not sure i= f we >>>> might be in diminishing return territory.____ >>>> >>>> __ __ >>>> >>>> (I would not oppose a clarification that speaks to the >>>> metadata independence of O for user packets, although maybe >>>> that does belong in other documents)____ >>>> >>>> __ __ >>>> >>>> Thanks!____ >>>> >>>> __ __ >>>> >>>> Carlos.____ >>>> >>>> __ __ >>>> >>>> On Jul 1, 2017, at 5:26 PM, Andrew G. Malis >>>> > wrote:____ >>>> >>>> __ __ >>>> >>>> Joel, ____ >>>> >>>> __ __ >>>> >>>> I would like to suggest changing:____ >>>> >>>> __ __ >>>> >>>> O bit: Setting this bit indicates an Operations, >>>> Administration, and >>>> Maintenance (OAM) packet. The actual packet format >>>> and processing of >>>> SFC OAM messages is outside the scope of this >>>> specification (see >>>> [oam-frame]).____ >>>> >>>> __ __ >>>> >>>> to:____ >>>> >>>> __ __ >>>> >>>> O bit: Setting this bit indicates the presence of >>>> Operations, Administration, and >>>> Maintenance (OAM) information. The actual OAM >>>> information format and processing____ >>>> >>>> is outside the scope of this specification (see >>>> [oam-frame]).____ >>>> >>>> __ __ >>>> >>>> __ __ >>>> >>>> The reason for this change is that we don=E2=80=99t yet kn= ow if >>>> the format of OAM information, and whether it will be in >>>> metadata, packet contents, or both. Thus, we don=E2=80=99t= yet >>>> even know if there will be =E2=80=9COAM packets=E2=80=9D p= er se, as data >>>> packets could possibly also carry OAM information in the >>>> metadata.____ >>>> >>>> __ __ >>>> >>>> If this change is acceptable, then the following two >>>> paragraphs should also be amended to:____ >>>> >>>> __ __ >>>> >>>> SF/SFF/SFC Proxy/Classifer implementations that do not >>>> support SFC >>>> OAM procedures SHOULD discard packets with O bit set, >>>> but MAY support >>>> a configurable parameter to enable forwarding received >>>> packets with the O bit____ >>>> >>>> set unmodified to the next element in the chain. >>>> Forwarding >>>> packets with the O bit set unmodified by SFC elements >>>> that do not support SFC OAM >>>> procedures may be acceptable for a subset of OAM >>>> functions, but can >>>> result in unexpected outcomes for others, thus it is >>>> recommended to >>>> analyze the impact of forwarding a packet with the O >>>> bit set for all OAM functions >>>> prior to enabling this behavior. The configurable >>>> parameter MUST be >>>> disabled by default. >>>> >>>> The O bit MUST be set for packets containing OAM >>>> information and MUST NOT be set for >>>> packets without OAM information. The O bit MUST NOT >>>> be modified along the SFP.____ >>>> >>>> __ __ >>>> >>>> __ __ >>>> >>>> Finally, I=E2=80=99ve seen both =E2=80=9CO bit=E2=80=9D an= d O-bit=E2=80=9D used in the >>>> document. The document should choose one.____ >>>> >>>> __ __ >>>> >>>> Thanks,____ >>>> >>>> Andy____ >>>> >>>> __ __ >>>> >>>> __ __ >>>> >>>> On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern >>>> > >>>> wrote:____ >>>> >>>> >>>> The definition of the O bit in the document is: >>>> >>>> O bit: Setting this bit indicates an Operations, >>>> Administration, and >>>> Maintenance (OAM) packet. The actual packet >>>> format and processing of >>>> SFC OAM messages is outside the scope of this >>>> specification (see >>>> [oam-frame]). >>>> >>>> SF/SFF/SFC Proxy/Classifer implementations that do >>>> not support SFC >>>> OAM procedures SHOULD discard packets with O-bit >>>> set, but MAY support >>>> a configurable parameter to enable forwarding >>>> received SFC OAM >>>> packets unmodified to the next element in the >>>> chain. Forwarding OAM >>>> packets unmodified by SFC elements that do not >>>> support SFC OAM >>>> procedures may be acceptable for a subset of OAM >>>> functions, but can >>>> result in unexpected outcomes for others, thus it >>>> is recommended to >>>> analyze the impact of forwarding an OAM packet for >>>> all OAM functions >>>> prior to enabling this behavior. The configurable >>>> parameter MUST be >>>> disabled by default. >>>> >>>> The O-bit MUST be set for OAM packets and MUST NOT >>>> be set for non-OAM >>>> packets. The O-bit MUST NOT be modified along the >>>> SFP. >>>> >>>> This seems to me a VERY clear description of when the >>>> bit is to be set, and what handling is required when >>>> packets with this bit are received at an NSH support >>>> entity. >>>> >>>> If you consider this wording unclear, please propose >>>> specific text to improve it. >>>> >>>> Yours, >>>> Joel >>>> >>>> On 7/1/17 5:02 PM, Greg Mirsky wrote:____ >>>> >>>> Hi Joel, >>>> by all means, I'm not asking to hold NSH document >>>> until SFC OAM solutions progress. But NSH refers >>>> to OAM packet and, in my view, it is too >>>> ambiguous term. Please consider, OAM packet may be= : >>>> >>>> * control message of active SFC OAM protocol >>>> carried as payload; >>>> * control message of active SFC OAM protocol >>>> carried as metadata; >>>> * control information and/or measurement >>>> results of hybrid SFC OAM >>>> protocol carried as metadata >>>> >>>> If work on OAM framework is progressing, perhaps >>>> all the OAM related discussion as well as >>>> allocation of the O-bit itself can be moved there. >>>> >>>> As co-author of several SFC OAM drafts I'd note >>>> that none of them has dependency on where OAM >>>> information must be placed, metadata or payload. >>>> But clear and unambiguous definitionsof OAM >>>> packet and interpretation of O-bit are very much >>>> needed and will help to progress SFC OAM solutions= . >>>> >>>> Regards, >>>> Greg____ >>>> >>>> On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern >>>> >>>> >>> >>>> >> wrote: >>>> >>>> Greg, the editors are working on the revision >>>> of the OAM Framework >>>> document. >>>> >>>> >>>> More importantly, we have been careful that >>>> the NSH document does >>>> not normatively depend upon the OAM >>>> specification. This was >>>> discussed with the working group several >>>> times, and the OAM wording >>>> in -13 is the result of that discussion. >>>> >>>> >>>> Are you really asking that we hold up RFC >>>> publication of the NSH >>>> document until we have agreement on all of >>>> the complex OAM issues >>>> (such as in-situ, etc.) I observe a steady >>>> rate of new OAM >>>> proposals, with new behaviors. That seems to >>>> indicate that such >>>> ahold-up would be almost indefinite. >>>> >>>> >>>> Yours, >>>> Joel M. Halpern >>>> >>>> On 7/1/17 3:39 PM, Greg Mirsky wrote: >>>> >>>> Hi Joel, Adrian, et. al, >>>> you'd expect that I'll look into OAM bit >>>> and wording on OAM >>>> packet first. And so I had. I'm concerned >>>> that NSH refers to >>>> expired and, frankly, stalled document >>>> that had not been >>>> discussed for too long. I believe the NSH >>>> document should have >>>> or refer to clear definition of SFC OAM >>>> packet before it defines >>>> interpretation of O-bit flag. >>>> draft-farrel-sfc-convent correctly >>>> points that in current form O-bit >>>> indicates presence of OAM >>>> information which can be either as >>>> metadata or as payload. I >>>> believe that we must have more clear and >>>> deterministic >>>> definition of OAM packet as current, in >>>> my opinion, may cause >>>> problems for HW-based SFC OAM support. >>>> >>>> Regards, >>>> Greg >>>> >>>> On Thu, Jun 29, 2017 at 4:22 PM, Joel >>>> Halpern Direct >>>> >>> >>>> >>> >____ >>>> >>>> >>> >>>> >>> >>> wrote: >>>> >>>> The -13 will be out in a few days >>>> with all the changes. >>>> That is what we will ask the WG to >>>> review. >>>> If we already had it out, we would >>>> have already asked for >>>> the WG to >>>> take a last look. >>>> >>>> Yours, >>>> Joel >>>> >>>> >>>> On 6/29/17 7:21 PM, Greg Mirsky wrote= : >>>> >>>> Hi Joel, >>>> is the -12 the latest published >>>> version of the NSH >>>> draft? As I >>>> see, it is missing TTL and all >>>> related changes: >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> sfc mailing list >>>> sfc@ietf.org >>>> > >>>> https://www.ietf.org/mailman/listinfo/sfc >>>> >>>> >>> mailman/listinfo/sfc >>>> > >>>> >>>> ____ >>>> >>>> >>>> _______________________________________________ >>>> sfc mailing list >>>> sfc@ietf.org >>>> https://www.ietf.org/mailman/listinfo/sfc >>>> ____ >>>> >>>> __ __ >>>> >>>> _______________________________________________ >>>> sfc mailing list >>>> sfc@ietf.org >>>> https://www.ietf.org/mailman/listinfo/sfc >>>> ____ >>>> >>>> __ __ >>>> >>>> =E2=80=94____ >>>> >>>> Carlos Pignataro, carlos@cisco.com >>>> >>>> /=E2=80=9CSometimes I use big words that I do not fully unders= tand, >>>> to make myself sound more photosynthesis."/____ >>>> >>>> __ __ >>>> >>>> __ __ >>>> >>>> >>>> >>> =E2=80=94 >>> Carlos Pignataro, carlos@cisco.com >>> >>> /=E2=80=9CSometimes I use big words that I do not fully understand, to = make >>> myself sound more photosynthesis."/ >>> >>> >> =E2=80=94 >> Carlos Pignataro, carlos@cisco.com >> >> /=E2=80=9CSometimes I use big words that I do not fully understand, to m= ake >> myself sound more photosynthesis."/ >> >> --94eb2c07684a78871c0553b24114 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Joel,
considering that we have active and hybrid OA= M mechanisms under discussion, the clear definition of what SFC OAM packet = must be, in my view, in the NSH document. I, for one, will support the defi= nition of SFC OAM packet as active OAM packet that is specifically generate= d for OAM purpose and whose scope is limited by the SFC domain.
<= br>
Regards,
Greg

On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Hal= pern <jmh@joelhalpern.com> wrote:
The current text says rather more than just "the O bit must = be zero". It prescribes what behavior should be implemented in NSH dev= ices for processing packets where the O bit is set.=C2=A0 Which we were spe= cifically asked to provide.

Speaking personally, I prefer that the OAM text in the NSH document not spe= cify where the OAM information is carried.=C2=A0 While some folks have assu= mptions about where the information will reside, we have not agreed on that= .

Yours,
Joel

On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote:
Correct practically =E2=80=94 zero for user packets.

And I believe that=E2=80=99s what this says (using more words):

=C2=A0 =C2=A0 =C2=A0O bit: Setting this bit indicates an Operations, Admini= stration, and
=C2=A0 =C2=A0 =C2=A0Maintenance (OAM) packet.=C2=A0 The actual packet forma= t and processing of
=C2=A0 =C2=A0 =C2=A0SFC OAM messages is outside the scope of this specifica= tion (see
=C2=A0 =C2=A0 =C2=A0[I-D.ietf-sfc-oam-framework]).

=C2=A0 =C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be s= et for non-OAM
=C2=A0 =C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the= SFP.


Thanks,

=E2=80=94 Carlos.

On Jul 6, 2017, at 11:20 PM, Dave Dolson <ddolson@sandvine.com <mailto:ddolson@sandvine.com>= > wrote:

Practically, "The O-bit MUST be zero." Until OAM for NSH is defin= ed.
Isn't that where we are at?



David Dolson
Sandvine
 *From: *Carlos Pignataro (cpignata)
*Sent: *Thursday, July 6, 2017 11:14 PM
*To: *Greg Mirsky
*Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org <mailto:sfc@ietf.org>; James N Guichard
*Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 = in Prague]



Thanks Greg and Jim. I would like to close on this item.

For clarity, what you (Greg) are proposing is the addition of the following= text:

=E2=80=9CSFC OAM packet is the packet that has OAM payload immediately foll= owing NSH.=C2=A0 In all other cases, i.e. when the payload is not OAM, the = O-bit MUST be reset.=E2=80=9D

And while at first glance it sounds like a potentially useful or at least n= on-harmful addition, very similar text already exists one paragraph below:<= br>
=E2=80=9CThe O-bit MUST be set for OAM packets and MUST NOT be set for non-= OAM packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.=E2=80=9D
I prefer to specify as little as possible of OAM here, since we are already= pointing to a spec that would detail this processing. Things like =E2=80= =9Cimmediately following=E2=80=9D can be specified in the OAM document. As = it is now, what O means is clear and aligns with what I wrote below.

Additionally, I=E2=80=99d much rather not change the text that was worked t= hrough iterations and consensus. However, I suggest we can move up that sen= tence one paragraph up to improve the flow and make it explicitly clear:

=C2=A0 =C2=A0 O bit: Setting this bit indicates an Operations, Administrati= on, and
=C2=A0 =C2=A0 Maintenance (OAM) packet.=C2=A0 The actual packet format and = processing of
=C2=A0 =C2=A0 SFC OAM messages is outside the scope of this specification (= see
=C2=A0 =C2=A0 [I-D.ietf-sfc-oam-framework]).

+=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for= non-OAM
+=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.<= br> +
=C2=A0 =C2=A0 SF/SFF/SFC Proxy/Classifer implementations that do not suppor= t SFC
=C2=A0 =C2=A0 OAM procedures SHOULD discard packets with O-bit set, but MAY= support
=C2=A0 =C2=A0 a configurable parameter to enable forwarding received SFC OA= M
=C2=A0 =C2=A0 packets unmodified to the next element in the chain.=C2=A0 Fo= rwarding OAM
=C2=A0 =C2=A0 packets unmodified by SFC elements that do not support SFC OA= M
=C2=A0 =C2=A0 procedures may be acceptable for a subset of OAM functions, b= ut can
=C2=A0 =C2=A0 result in unexpected outcomes for others, thus it is recommen= ded to
=C2=A0 =C2=A0 analyze the impact of forwarding an OAM packet for all OAM fu= nctions
=C2=A0 =C2=A0 prior to enabling this behavior.=C2=A0 The configurable param= eter MUST be
=C2=A0 =C2=A0 disabled by default.

-=C2=A0 =C2=A0The O-bit MUST be set for OAM packets and MUST NOT be set for= non-OAM
-=C2=A0 =C2=A0packets.=C2=A0 The O-bit MUST NOT be modified along the SFP.<= br> -

Thoughts on this proposal? It seems to achieve the right balance of not ove= r specify but bring clarity.

Thanks,

=E2=80=94 Carlos.


On Jul 6, 2017, at 10:07 PM, Greg Mirsky <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> wrote:

Hi Jim,
I can give my interpretation of what Carlos had proposed and how his clarif= ication may be reflected in the document:
OLD:
O bit: Setting this bit indicates an Operations, Administration, and Mainte= nance (OAM) packet. The actual packet format and processing of SFC OAM mess= ages is outside the scope of this specification (see [oam-frame]).
NEW:
O bit: Setting this bit indicates an Operations, Administration, and Mainte= nance (OAM) packet. SFC OAM packet is the packet that has OAM payload immed= iately following NSH. In all other cases, i.e. when the payload is not OAM,= the O-bit MUST be reset. The actual packet format and processing of SFC OA= M messages are outside the scope of this specification (see [oam-frame]). Regards,
Greg

 On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard <james.n.guichard@huawei.com = <mailto:james.n.guichard@huawei.com>> wrote:

=C2=A0 =C2=A0 Hi Greg/Carlos,____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 It is difficult to tell from this thread whether a textual ch= ange
=C2=A0 =C2=A0 is being proposed or if the current text is sufficient; pleas= e
=C2=A0 =C2=A0 can you clarify for the WG and if a textual change is being =C2=A0 =C2=A0 proposed please clearly state what this is so that the WG can=
=C2=A0 =C2=A0 evaluate and we can move forward.____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 Many thanks!____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 Jim____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 *From:*sfc [mailto:sfc-bounces@ietf.org
=C2=A0 =C2=A0 <mailto:sfc-bounces@ietf.org>] *On Behalf Of *Greg Mirsky
=C2=A0 =C2=A0 *Sent:* Tuesday, July 04, 2017 1:41 AM
=C2=A0 =C2=A0 *To:* Carlos Pignataro (cpignata) <cpignata@cisco.com
=C2=A0 =C2=A0 <mailto:cpignata@cisco.com>>
=C2=A0 =C2=A0 *Cc:* Joel M. Halpern <jmh@joelhalpern.com
=C2=A0 =C2=A0 <mailto:jmh@joelhalpern.com>>; Andrew G. Malis <agmalis@gmail.com
=C2=A0 =C2=A0 <mailto:agmalis@gmail.com>>; sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeti= ng
=C2=A0 =C2=A0 at IETF 99 in Prague]____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 Hi Carlos,____

=C2=A0 =C2=A0 you have valid interpretation of the text in its current vers= ion.
=C2=A0 =C2=A0 And I think that if it was in the document as you have presen= ted
=C2=A0 =C2=A0 (or very close to it), it would address my concern, as you= 9;ve
=C2=A0 =C2=A0 provided clear and unambiguous definition of what considered = as
=C2=A0 =C2=A0 OAM packet in SFC - packet that carries OAM information as =C2=A0 =C2=A0 payload that immediately follows the NSH.____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 Regards,____

=C2=A0 =C2=A0 Greg____

=C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) =C2=A0 =C2=A0 <c= pignata@cisco.com <mailto:cpignata@cisco.com>> wrote:____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Andy, ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 I believe that s/packet/information/ can actual= ly cause more
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 confusion that bring clarity.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 O=3D0 means that the payload is a user packet. = O=3D1 means the
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 payload is an OAM packet. ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 However, this is independent of the Metadata, s= ince some
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Metadata can be OAM-ish (as a timestamp). And t= his is also
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 independent of a NULL payload as in Adrian=E2= =80=99s draft.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 A user packet with OAM-ish metadata will have O= =3D0.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 The text can always be polished more =E2=80=94 = I am not sure if we
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 might be in diminishing return territory.____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 (I would not oppose a clarification that speaks= to the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 metadata independence of O for user packets, al= though maybe
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that does belong in other documents)____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks!____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Carlos.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On Jul 1, 2017, at 5:26 PM, Andre= w G. Malis
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <agmalis@gmail.com <mailto:agmalis@gmail.com>> wrote:= ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Joel, ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 I would like to suggest changing:= ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 O bit: Setting this bit indicates= an Operations,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Administration, and
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Maintenance (OAM) pa= cket.=C2=A0 The actual packet format
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 and processing of
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SFC OAM messages is outside the s= cope of this
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 specification (see
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[oam-frame]).____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 to:____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 O bit: Setting this bit indicates= the presence of
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Operations, Administration, and =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Maintenance (OAM) in= formation.=C2=A0 The actual OAM
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 information format and processing= ____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is outside the scope= of this specification (see=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= [oam-frame]).____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The reason for this change is tha= t we don=E2=80=99t yet know if
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the format of OAM information, an= d whether it will be in
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 metadata, packet contents, or bot= h. Thus, we don=E2=80=99t yet
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 even know if there will be =E2=80= =9COAM packets=E2=80=9D per se, as data
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packets could possibly also carry= OAM information in the
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 metadata.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 If this change is acceptable, the= n the following two
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 paragraphs should also be amended= to:____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SF/SFF/SFC Proxy/Cla= ssifer implementations that do not
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 support SFC
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0OAM procedures SHOUL= D discard packets with O bit set,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 but MAY support
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a configurable param= eter to enable forwarding received
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packets with the O bit____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0set unmodified to th= e next element in the chain.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0Forwarding
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packets with the O b= it set unmodified by SFC elements
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that do not support SFC OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0procedures may be ac= ceptable for a subset of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 functions, but can
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0result in unexpected= outcomes for others, thus it is
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 recommended to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0analyze the impact o= f forwarding a packet with the O
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 bit set for all OAM functions
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0prior to enabling th= is behavior.=C2=A0 The configurable
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 parameter MUST be
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0disabled by default.=

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The O bit MUST be se= t for packets containing OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 information and MUST NOT be set f= or
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packets without OAM = information.=C2=A0 The O bit MUST NOT
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 be modified along the SFP.____
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Finally, I=E2=80=99ve seen both = =E2=80=9CO bit=E2=80=9D and O-bit=E2=80=9D used in the
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 document. The document should cho= ose one.____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks,____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Andy____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On Sat, Jul 1, 2017 at 5:11 PM, J= oel M. Halpern
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>= ; wrote:____


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The definition of t= he O bit in the document is:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 O bit: Setting this= bit indicates an Operations,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Administration, and=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Mainte= nance (OAM) packet.=C2=A0 The actual packet
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 format and processi= ng of
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SFC OA= M messages is outside the scope of this
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 specification (see<= br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[oam-f= rame]).

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SF/SFF= /SFC Proxy/Classifer implementations that do
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 not support SFC
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0OAM pr= ocedures SHOULD discard packets with O-bit
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 set, but MAY suppor= t
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a conf= igurable parameter to enable forwarding
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 received SFC OAM =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet= s unmodified to the next element in the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 chain.=C2=A0 Forwar= ding OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet= s unmodified by SFC elements that do not
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 support SFC OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0proced= ures may be acceptable for a subset of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 functions, but can<= br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0result= in unexpected outcomes for others, thus it
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 is recommended to =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0analyz= e the impact of forwarding an OAM packet for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 all OAM functions =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0prior = to enabling this behavior.=C2=A0 The configurable
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 parameter MUST be =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0disabl= ed by default.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The O-= bit MUST be set for OAM packets and MUST NOT
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 be set for non-OAM<= br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet= s.=C2=A0 The O-bit MUST NOT be modified along the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SFP.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 This seems to me a = VERY clear description of when the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 bit is to be set, a= nd what handling is required when
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packets with this b= it are received at an NSH support
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 entity.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 If you consider thi= s wording unclear, please propose
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 specific text to im= prove it.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Joel

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On 7/1/17 5:02 PM, = Greg Mirsky wrote:____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Jo= el,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 by al= l means, I'm not asking to hold NSH document
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 until= SFC OAM solutions progress. But NSH refers
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 to OA= M packet and, in my view, it is too
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ambig= uous term. Please consider, OAM packet may be:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 * control message of active SFC OAM protocol
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 carri= ed as payload;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 * control message of active SFC OAM protocol
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 carri= ed as metadata;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 * control information and/or measurement
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 resul= ts of hybrid SFC OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 protocol carried as metadata

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 If wo= rk on OAM framework is progressing, perhaps
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 all t= he OAM related discussion as well as
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 alloc= ation of the O-bit itself can be moved there.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 As co= -author of several SFC OAM drafts I'd note
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that = none of them has dependency on where OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 infor= mation must be placed, metadata or payload.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 But c= lear and unambiguous definitionsof OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packe= t and interpretation of O-bit are very much
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 neede= d and will help to progress SFC OAM solutions.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Regar= ds,
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Greg_= ___

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On Sa= t, Jul 1, 2017 at 1:21 PM, Joel M. Halpern
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <<= a href=3D"mailto:jmh@joelhalpern.com" target=3D"_blank">jmh@joelhalpern.com= <mailto:jm= h@joelhalpern.com>
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh@joelhalp= ern.com

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh@joelhalp= ern.com>>> wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 Greg, the editors are working on the revision
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 of th= e OAM Framework
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 document.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 <chair hat on>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 More importantly, we have been careful that
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the N= SH document does
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 not normatively depend upon the OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 speci= fication.=C2=A0 This was
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 discussed with the working group several
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 times= , and the OAM wording
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 in -13 is the result of that discussion.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 </chair hat on>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 <chair hat off>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 Are you really asking that we hold up RFC
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 publi= cation of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 document until we have agreement on all of
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the c= omplex OAM issues
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 (such as in-situ, etc.)=C2=A0 I observe a steady
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 rate = of new OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 proposals, with new behaviors.=C2=A0 That seems to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 indic= ate that such
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 ahold-up would be almost indefinite.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 </chair hat off>

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 Joel M. Halpern

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 On 7/1/17 3:39 PM, Greg Mirsky wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 Hi Joel, Adrian, et. al,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 you'd expect that I'll look into OAM bit =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 and w= ording on OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 packet first. And so I had. I'm concerned
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that = NSH refers to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 expired and, frankly, stalled document
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that = had not been
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 discussed for too long. I believe the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 docum= ent should have
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 or refer to clear definition of SFC OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packe= t before it defines
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 interpretation of O-bit flag.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 draft= -farrel-sfc-convent correctly
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 points that in current form O-bit
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 indic= ates presence of OAM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 information which can be either as
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 metad= ata or as payload. I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 believe that we must have more clear and
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 deter= ministic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 definition of OAM packet as current, in
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 my op= inion, may cause
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 problems for HW-based SFC OAM support.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 Regards,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 Greg

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 On Thu, Jun 29, 2017 at 4:22 PM, Joel
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Halpe= rn Direct
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 <jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh.d= irect@joelhalpern.com>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh.d= irect@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh.d= irect@joelhalpern.com>>____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh.d= irect@joelhalpern.com>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 <mailto:jmh.direct@joelhalpern.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:jmh.d= irect@joelhalpern.com>>>> wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The -13 will be out in a few d= ays
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 with = all the changes.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That is what we will ask the W= G to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 revie= w.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If we already had it out, we w= ould
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 have = already asked for
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 the WG to
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0take a last look.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 6/29/17 7:21 PM, Greg Mirsk= y wrote:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Joel,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is the -12 the l= atest published
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 versi= on of the NSH
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 draft? As I
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see, it is missi= ng TTL and all
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 relat= ed changes:




=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0_______________________________________________ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <m= ailto:sfc@ietf.org &l= t;mailto:sfc@ietf.org= >>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/mailman/listinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <<= a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"noreferrer" tar= get=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0<https://www.ietf.org/mailman/l= istinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <<= a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"noreferrer" tar= get=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc>>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ____<= span class=3D"">


=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ___________________= ____________________________
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 htt= ps://www.ietf.org/mailman/listinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.ietf.org/mailman/listinfo/sfc>____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 _______________________________________________
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc mailing list
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sfc@ietf.org <mailto:sfc@ietf.org>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.= org/mailman/listinfo/sfc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.i= etf.org/mailman/listinfo/sfc>____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =E2=80=94____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Carlos Pignataro, carlos@cisco.com <mailto:carlos@cisco.com>

=C2=A0 =C2=A0 =C2=A0 =C2=A0 /=E2=80=9CSometimes I use big words that I do n= ot fully understand,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 to make myself sound more photosynthesis."= /____

=C2=A0 =C2=A0 =C2=A0 =C2=A0 __ __

=C2=A0 =C2=A0 __ __



=E2=80=94
Carlos Pignataro, car= los@cisco.com <mailto:carlos@cisco.com>

/=E2=80=9CSometimes I use big words that I do not fully understand, to make= myself sound more photosynthesis."/


=E2=80=94
Carlos Pignataro, car= los@cisco.com <mailto:carlos@cisco.com>

/=E2=80=9CSometimes I use big words that I do not fully understand, to make= myself sound more photosynthesis."/


--94eb2c07684a78871c0553b24114-- From nobody Thu Jul 6 21:05:22 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 464FC129AB0 for ; Thu, 6 Jul 2017 21:05:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r02mWS5pG042 for ; Thu, 6 Jul 2017 21:05:18 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F36A0128B91 for ; Thu, 6 Jul 2017 21:05:17 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id DFFAD1C020B; Thu, 6 Jul 2017 21:05:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1499400317; bh=KZ9/NfN7G/SelVIQs2Ny1gsi+3XeeRutA6z+xwrRkcg=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=PuUjdky5rn/fHEyxkZjb7KOsQJl8b+bpqnEeIAEvE/LQbfU9vuDx4t5JQSUJynQ7Z caHI7365XzRII5LJz2UCbdLDV3OFkbx2qd8szK4xvMJlVwjU1s9WICjslSKH+bn6Rm outNam9vsKeZ/lWwPxrGzOsCUDr0jeOGO9rYVdkw= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 8C45D1C0178; Thu, 6 Jul 2017 21:05:16 -0700 (PDT) To: Greg Mirsky Cc: "Carlos Pignataro (cpignata)" , "Andrew G. Malis" , "sfc@ietf.org" , Dave Dolson , James N Guichard References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> From: "Joel M. Halpern" Message-ID: <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> Date: Fri, 7 Jul 2017 00:05:15 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 04:05:20 -0000 I would have to see specific text. I am personally not happy with the wording you suggested recently that an OAM packet is one where the OAM payload follows the NSH header. The point of the bit is that it tells the NSH processing entity that it is required to do extra work. The point of the bit is NOT to tell it what extra work is required, or where to look for extra information. And by keeping that separation, we get significant flexibility in how we address various cases. And we can evaluate the behaviors we want for the different situations, and set the bit appropriately for our desired behavior. Yours, Joel On 7/6/17 11:59 PM, Greg Mirsky wrote: > Hi Joel, > considering that we have active and hybrid OAM mechanisms under > discussion, the clear definition of what SFC OAM packet must be, in my > view, in the NSH document. I, for one, will support the definition of > SFC OAM packet as active OAM packet that is specifically generated for > OAM purpose and whose scope is limited by the SFC domain. > > Regards, > Greg > > On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Halpern > wrote: > > The current text says rather more than just "the O bit must be > zero". It prescribes what behavior should be implemented in NSH > devices for processing packets where the O bit is set. Which we > were specifically asked to provide. > > Speaking personally, I prefer that the OAM text in the NSH document > not specify where the OAM information is carried. While some folks > have assumptions about where the information will reside, we have > not agreed on that. > > Yours, > Joel > > On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote: > > Correct practically — zero for user packets. > > And I believe that’s what this says (using more words): > > O bit: Setting this bit indicates an Operations, > Administration, and > Maintenance (OAM) packet. The actual packet format and > processing of > SFC OAM messages is outside the scope of this > specification (see > [I-D.ietf-sfc-oam-framework]). > > The O-bit MUST be set for OAM packets and MUST NOT be set > for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > > Thanks, > > — Carlos. > > On Jul 6, 2017, at 11:20 PM, Dave Dolson > > >> > wrote: > > Practically, "The O-bit MUST be zero." Until OAM for NSH is > defined. > Isn't that where we are at? > > > > David Dolson > Sandvine > *From: *Carlos Pignataro (cpignata) > *Sent: *Thursday, July 6, 2017 11:14 PM > *To: *Greg Mirsky > *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org > >; James N Guichard > *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: > Meeting at IETF 99 in Prague] > > > > Thanks Greg and Jim. I would like to close on this item. > > For clarity, what you (Greg) are proposing is the addition > of the following text: > > “SFC OAM packet is the packet that has OAM payload > immediately following NSH. In all other cases, i.e. when > the payload is not OAM, the O-bit MUST be reset.†> > And while at first glance it sounds like a potentially > useful or at least non-harmful addition, very similar text > already exists one paragraph below: > > “The O-bit MUST be set for OAM packets and MUST NOT be set > for non-OAM packets. The O-bit MUST NOT be modified along > the SFP.†> > I prefer to specify as little as possible of OAM here, since > we are already pointing to a spec that would detail this > processing. Things like “immediately following†can be > specified in the OAM document. As it is now, what O means is > clear and aligns with what I wrote below. > > Additionally, I’d much rather not change the text that was > worked through iterations and consensus. However, I suggest > we can move up that sentence one paragraph up to improve the > flow and make it explicitly clear: > > > O bit: Setting this bit indicates an Operations, > Administration, and > Maintenance (OAM) packet. The actual packet format and > processing of > SFC OAM messages is outside the scope of this > specification (see > [I-D.ietf-sfc-oam-framework]). > > + The O-bit MUST be set for OAM packets and MUST NOT be > set for non-OAM > + packets. The O-bit MUST NOT be modified along the SFP. > + > SF/SFF/SFC Proxy/Classifer implementations that do not > support SFC > OAM procedures SHOULD discard packets with O-bit set, > but MAY support > a configurable parameter to enable forwarding received > SFC OAM > packets unmodified to the next element in the chain. > Forwarding OAM > packets unmodified by SFC elements that do not support > SFC OAM > procedures may be acceptable for a subset of OAM > functions, but can > result in unexpected outcomes for others, thus it is > recommended to > analyze the impact of forwarding an OAM packet for all > OAM functions > prior to enabling this behavior. The configurable > parameter MUST be > disabled by default. > > - The O-bit MUST be set for OAM packets and MUST NOT be > set for non-OAM > - packets. The O-bit MUST NOT be modified along the SFP. > - > > Thoughts on this proposal? It seems to achieve the right > balance of not over specify but bring clarity. > > Thanks, > > — Carlos. > > > On Jul 6, 2017, at 10:07 PM, Greg Mirsky > > >> wrote: > > Hi Jim, > I can give my interpretation of what Carlos had proposed > and how his clarification may be reflected in the document: > OLD: > O bit: Setting this bit indicates an Operations, > Administration, and Maintenance (OAM) packet. The actual > packet format and processing of SFC OAM messages is > outside the scope of this specification (see [oam-frame]). > NEW: > O bit: Setting this bit indicates an Operations, > Administration, and Maintenance (OAM) packet. SFC OAM > packet is the packet that has OAM payload immediately > following NSH. In all other cases, i.e. when the payload > is not OAM, the O-bit MUST be reset. The actual packet > format and processing of SFC OAM messages are outside > the scope of this specification (see [oam-frame]). > Regards, > Greg > > On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard > > >> wrote: > > Hi Greg/Carlos,____ > > __ __ > > It is difficult to tell from this thread whether a > textual change > is being proposed or if the current text is > sufficient; please > can you clarify for the WG and if a textual change > is being > proposed please clearly state what this is so that > the WG can > evaluate and we can move forward.____ > > __ __ > > Many thanks!____ > > __ __ > > Jim____ > > __ __ > > *From:*sfc [mailto:sfc-bounces@ietf.org > > >] *On Behalf Of *Greg Mirsky > *Sent:* Tuesday, July 04, 2017 1:41 AM > *To:* Carlos Pignataro (cpignata) > > >> > *Cc:* Joel M. Halpern > >>; Andrew G. Malis > > >>; sfc@ietf.org > > > *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh > [Was: Meeting > at IETF 99 in Prague]____ > > __ __ > > Hi Carlos,____ > > you have valid interpretation of the text in its > current version. > And I think that if it was in the document as you > have presented > (or very close to it), it would address my concern, > as you've > provided clear and unambiguous definition of what > considered as > OAM packet in SFC - packet that carries OAM > information as > payload that immediately follows the NSH.____ > > __ __ > > Regards,____ > > Greg____ > > __ __ > > On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro > (cpignata) > > >> > wrote:____ > > Hi Andy, ____ > > __ __ > > I believe that s/packet/information/ can > actually cause more > confusion that bring clarity.____ > > __ __ > > O=0 means that the payload is a user packet. > O=1 means the > payload is an OAM packet. ____ > > __ __ > > However, this is independent of the Metadata, > since some > Metadata can be OAM-ish (as a timestamp). And > this is also > independent of a NULL payload as in Adrian’s > draft.____ > > __ __ > > A user packet with OAM-ish metadata will have > O=0.____ > > __ __ > > The text can always be polished more — I am not > sure if we > might be in diminishing return territory.____ > > __ __ > > (I would not oppose a clarification that speaks > to the > metadata independence of O for user packets, > although maybe > that does belong in other documents)____ > > __ __ > > Thanks!____ > > __ __ > > Carlos.____ > > __ __ > > On Jul 1, 2017, at 5:26 PM, Andrew G. Malis > >> wrote:____ > > __ __ > > Joel, ____ > > __ __ > > I would like to suggest changing:____ > > __ __ > > O bit: Setting this bit indicates an > Operations, > Administration, and > Maintenance (OAM) packet. The actual > packet format > and processing of > SFC OAM messages is outside the scope of this > specification (see > [oam-frame]).____ > > __ __ > > to:____ > > __ __ > > O bit: Setting this bit indicates the > presence of > Operations, Administration, and > Maintenance (OAM) information. The > actual OAM > information format and processing____ > > is outside the scope of this > specification (see [oam-frame]).____ > > __ __ > > __ __ > > The reason for this change is that we don’t > yet know if > the format of OAM information, and whether > it will be in > metadata, packet contents, or both. Thus, > we don’t yet > even know if there will be “OAM packets†> per se, as data > packets could possibly also carry OAM > information in the > metadata.____ > > __ __ > > If this change is acceptable, then the > following two > paragraphs should also be amended to:____ > > __ __ > > SF/SFF/SFC Proxy/Classifer > implementations that do not > support SFC > OAM procedures SHOULD discard packets > with O bit set, > but MAY support > a configurable parameter to enable > forwarding received > packets with the O bit____ > > set unmodified to the next element in > the chain. Forwarding > packets with the O bit set unmodified by > SFC elements > that do not support SFC OAM > procedures may be acceptable for a > subset of OAM > functions, but can > result in unexpected outcomes for > others, thus it is > recommended to > analyze the impact of forwarding a > packet with the O > bit set for all OAM functions > prior to enabling this behavior. The > configurable > parameter MUST be > disabled by default. > > The O bit MUST be set for packets > containing OAM > information and MUST NOT be set for > packets without OAM information. The O > bit MUST NOT > be modified along the SFP.____ > > __ __ > > __ __ > > Finally, I’ve seen both “O bit†and O-bit†> used in the > document. The document should choose one.____ > > __ __ > > Thanks,____ > > Andy____ > > __ __ > > __ __ > > On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern > >> wrote:____ > > > The definition of the O bit in the > document is: > > O bit: Setting this bit indicates an > Operations, > Administration, and > Maintenance (OAM) packet. The > actual packet > format and processing of > SFC OAM messages is outside the > scope of this > specification (see > [oam-frame]). > > SF/SFF/SFC Proxy/Classifer > implementations that do > not support SFC > OAM procedures SHOULD discard > packets with O-bit > set, but MAY support > a configurable parameter to enable > forwarding > received SFC OAM > packets unmodified to the next > element in the > chain. Forwarding OAM > packets unmodified by SFC elements > that do not > support SFC OAM > procedures may be acceptable for a > subset of OAM > functions, but can > result in unexpected outcomes for > others, thus it > is recommended to > analyze the impact of forwarding an > OAM packet for > all OAM functions > prior to enabling this behavior. > The configurable > parameter MUST be > disabled by default. > > The O-bit MUST be set for OAM > packets and MUST NOT > be set for non-OAM > packets. The O-bit MUST NOT be > modified along the > SFP. > > This seems to me a VERY clear > description of when the > bit is to be set, and what handling is > required when > packets with this bit are received at > an NSH support > entity. > > If you consider this wording unclear, > please propose > specific text to improve it. > > Yours, > Joel > > On 7/1/17 5:02 PM, Greg Mirsky wrote:____ > > Hi Joel, > by all means, I'm not asking to > hold NSH document > until SFC OAM solutions progress. > But NSH refers > to OAM packet and, in my view, it > is too > ambiguous term. Please consider, > OAM packet may be: > > * control message of active SFC > OAM protocol > carried as payload; > * control message of active SFC > OAM protocol > carried as metadata; > * control information and/or > measurement > results of hybrid SFC OAM > protocol carried as metadata > > If work on OAM framework is > progressing, perhaps > all the OAM related discussion as > well as > allocation of the O-bit itself can > be moved there. > > As co-author of several SFC OAM > drafts I'd note > that none of them has dependency on > where OAM > information must be placed, > metadata or payload. > But clear and unambiguous > definitionsof OAM > packet and interpretation of O-bit > are very much > needed and will help to progress > SFC OAM solutions. > > Regards, > Greg____ > > On Sat, Jul 1, 2017 at 1:21 PM, > Joel M. Halpern > > > > > >>> wrote: > > Greg, the editors are working > on the revision > of the OAM Framework > document. > > > More importantly, we have been > careful that > the NSH document does > not normatively depend upon the OAM > specification. This was > discussed with the working > group several > times, and the OAM wording > in -13 is the result of that > discussion. > > > Are you really asking that we > hold up RFC > publication of the NSH > document until we have > agreement on all of > the complex OAM issues > (such as in-situ, etc.) I > observe a steady > rate of new OAM > proposals, with new behaviors. > That seems to > indicate that such > ahold-up would be almost > indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky > wrote: > > Hi Joel, Adrian, et. al, > you'd expect that I'll look > into OAM bit > and wording on OAM > packet first. And so I had. > I'm concerned > that NSH refers to > expired and, frankly, > stalled document > that had not been > discussed for too long. I > believe the NSH > document should have > or refer to clear > definition of SFC OAM > packet before it defines > interpretation of O-bit flag. > draft-farrel-sfc-convent correctly > points that in current form > O-bit > indicates presence of OAM > information which can be > either as > metadata or as payload. I > believe that we must have > more clear and > deterministic > definition of OAM packet as > current, in > my opinion, may cause > problems for HW-based SFC > OAM support. > > Regards, > Greg > > On Thu, Jun 29, 2017 at > 4:22 PM, Joel > Halpern Direct > > > > > >>____ > > > > > > > > >>>> wrote: > > The -13 will be out in > a few days > with all the changes. > That is what we will > ask the WG to > review. > If we already had it > out, we would > have already asked for > the WG to > take a last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, > Greg Mirsky wrote: > > Hi Joel, > is the -12 the > latest published > version of the NSH > draft? As I > see, it is missing > TTL and all > related changes: > > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > > >> > https://www.ietf.org/mailman/listinfo/sfc > > > > > > > > >> > > ____ > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > >____ > > __ __ > > _______________________________________________ > sfc mailing list > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > >____ > > __ __ > > —____ > > Carlos Pignataro, carlos@cisco.com > > > > /“Sometimes I use big words that I do not fully > understand, > to make myself sound more photosynthesis."/____ > > __ __ > > __ __ > > > > — > Carlos Pignataro, carlos@cisco.com > > > > /“Sometimes I use big words that I do not fully understand, > to make myself sound more photosynthesis."/ > > > — > Carlos Pignataro, carlos@cisco.com > > > > /“Sometimes I use big words that I do not fully understand, to > make myself sound more photosynthesis."/ > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Fri Jul 7 07:14:27 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCE9B12EC10 for ; Fri, 7 Jul 2017 07:14:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KTY4PMZipg0d for ; Fri, 7 Jul 2017 07:14:22 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BC3DD128CFF for ; Fri, 7 Jul 2017 07:14:21 -0700 (PDT) Received: from WTL-EXCHP-1.sandvine.com ([fe80::ac6b:cc1e:f2ff:93aa]) by wtl-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Fri, 7 Jul 2017 10:14:08 -0400 From: Dave Dolson To: "Joel M. Halpern" , Greg Mirsky CC: "Carlos Pignataro (cpignata)" , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIAAZxA/ Date: Fri, 7 Jul 2017 14:14:07 +0000 Message-ID: <20170707141406.5144657.95230.22069@sandvine.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> , <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> In-Reply-To: <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 14:14:26 -0000 Earlier I suggested that if OAM=3D0, it is guaranteed that any SFC forwardi= ng agent needs only consider the SPI and SI. In other words, O is the slow-path bit, if you think of ASICs and handling = exceptional cases in software. David Dolson Sandvine Original Message From: Joel M. Halpern Sent: Friday, July 7, 2017 12:05 AM To: Greg Mirsky Cc: Carlos Pignataro (cpignata); Andrew G. Malis; sfc@ietf.org; Dave Dolson= ; James N Guichard Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague] I would have to see specific text. I am personally not happy with the wording you suggested recently that an OAM packet is one where the OAM payload follows the NSH header. The point of the bit is that it tells the NSH processing entity that it is required to do extra work. The point of the bit is NOT to tell it what extra work is required, or where to look for extra information. And by keeping that separation, we get significant flexibility in how we address various cases. And we can evaluate the behaviors we want for the different situations, and set the bit appropriately for our desired behavior. Yours, Joel On 7/6/17 11:59 PM, Greg Mirsky wrote: > Hi Joel, > considering that we have active and hybrid OAM mechanisms under > discussion, the clear definition of what SFC OAM packet must be, in my > view, in the NSH document. I, for one, will support the definition of > SFC OAM packet as active OAM packet that is specifically generated for > OAM purpose and whose scope is limited by the SFC domain. > > Regards, > Greg > > On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Halpern > wrote: > > The current text says rather more than just "the O bit must be > zero". It prescribes what behavior should be implemented in NSH > devices for processing packets where the O bit is set. Which we > were specifically asked to provide. > > Speaking personally, I prefer that the OAM text in the NSH document > not specify where the OAM information is carried. While some folks > have assumptions about where the information will reside, we have > not agreed on that. > > Yours, > Joel > > On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote: > > Correct practically =97 zero for user packets. > > And I believe that=92s what this says (using more words): > > O bit: Setting this bit indicates an Operations, > Administration, and > Maintenance (OAM) packet. The actual packet format and > processing of > SFC OAM messages is outside the scope of this > specification (see > [I-D.ietf-sfc-oam-framework]). > > The O-bit MUST be set for OAM packets and MUST NOT be set > for non-OAM > packets. The O-bit MUST NOT be modified along the SFP. > > > Thanks, > > =97 Carlos. > > On Jul 6, 2017, at 11:20 PM, Dave Dolson > > >> > wrote: > > Practically, "The O-bit MUST be zero." Until OAM for NSH is > defined. > Isn't that where we are at? > > > > David Dolson > Sandvine > *From: *Carlos Pignataro (cpignata) > *Sent: *Thursday, July 6, 2017 11:14 PM > *To: *Greg Mirsky > *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org > >; James N Guichard > *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: > Meeting at IETF 99 in Prague] > > > > Thanks Greg and Jim. I would like to close on this item. > > For clarity, what you (Greg) are proposing is the addition > of the following text: > > =93SFC OAM packet is the packet that has OAM payload > immediately following NSH. In all other cases, i.e. when > the payload is not OAM, the O-bit MUST be reset.=94 > > And while at first glance it sounds like a potentially > useful or at least non-harmful addition, very similar text > already exists one paragraph below: > > =93The O-bit MUST be set for OAM packets and MUST NOT be set > for non-OAM packets. The O-bit MUST NOT be modified along > the SFP.=94 > > I prefer to specify as little as possible of OAM here, since > we are already pointing to a spec that would detail this > processing. Things like =93immediately following=94 can be > specified in the OAM document. As it is now, what O means is > clear and aligns with what I wrote below. > > Additionally, I=92d much rather not change the text that was > worked through iterations and consensus. However, I suggest > we can move up that sentence one paragraph up to improve the > flow and make it explicitly clear: > > > O bit: Setting this bit indicates an Operations, > Administration, and > Maintenance (OAM) packet. The actual packet format and > processing of > SFC OAM messages is outside the scope of this > specification (see > [I-D.ietf-sfc-oam-framework]). > > + The O-bit MUST be set for OAM packets and MUST NOT be > set for non-OAM > + packets. The O-bit MUST NOT be modified along the SFP. > + > SF/SFF/SFC Proxy/Classifer implementations that do not > support SFC > OAM procedures SHOULD discard packets with O-bit set, > but MAY support > a configurable parameter to enable forwarding received > SFC OAM > packets unmodified to the next element in the chain. > Forwarding OAM > packets unmodified by SFC elements that do not support > SFC OAM > procedures may be acceptable for a subset of OAM > functions, but can > result in unexpected outcomes for others, thus it is > recommended to > analyze the impact of forwarding an OAM packet for all > OAM functions > prior to enabling this behavior. The configurable > parameter MUST be > disabled by default. > > - The O-bit MUST be set for OAM packets and MUST NOT be > set for non-OAM > - packets. The O-bit MUST NOT be modified along the SFP. > - > > Thoughts on this proposal? It seems to achieve the right > balance of not over specify but bring clarity. > > Thanks, > > =97 Carlos. > > > On Jul 6, 2017, at 10:07 PM, Greg Mirsky > > >> wrote: > > Hi Jim, > I can give my interpretation of what Carlos had proposed > and how his clarification may be reflected in the documen= t: > OLD: > O bit: Setting this bit indicates an Operations, > Administration, and Maintenance (OAM) packet. The actual > packet format and processing of SFC OAM messages is > outside the scope of this specification (see [oam-frame])= . > NEW: > O bit: Setting this bit indicates an Operations, > Administration, and Maintenance (OAM) packet. SFC OAM > packet is the packet that has OAM payload immediately > following NSH. In all other cases, i.e. when the payload > is not OAM, the O-bit MUST be reset. The actual packet > format and processing of SFC OAM messages are outside > the scope of this specification (see [oam-frame]). > Regards, > Greg > > On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard > > >> wrote: > > Hi Greg/Carlos,____ > > __ __ > > It is difficult to tell from this thread whether a > textual change > is being proposed or if the current text is > sufficient; please > can you clarify for the WG and if a textual change > is being > proposed please clearly state what this is so that > the WG can > evaluate and we can move forward.____ > > __ __ > > Many thanks!____ > > __ __ > > Jim____ > > __ __ > > *From:*sfc [mailto:sfc-bounces@ietf.org > > >] *On Behalf Of *Greg Mirsk= y > *Sent:* Tuesday, July 04, 2017 1:41 AM > *To:* Carlos Pignataro (cpignata) > > >> > *Cc:* Joel M. Halpern > >>; Andrew G. Malis > > >>; sfc@ietf.org > > > *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh > [Was: Meeting > at IETF 99 in Prague]____ > > __ __ > > Hi Carlos,____ > > you have valid interpretation of the text in its > current version. > And I think that if it was in the document as you > have presented > (or very close to it), it would address my concern, > as you've > provided clear and unambiguous definition of what > considered as > OAM packet in SFC - packet that carries OAM > information as > payload that immediately follows the NSH.____ > > __ __ > > Regards,____ > > Greg____ > > __ __ > > On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro > (cpignata) > > >> > wrote:____ > > Hi Andy, ____ > > __ __ > > I believe that s/packet/information/ can > actually cause more > confusion that bring clarity.____ > > __ __ > > O=3D0 means that the payload is a user packet. > O=3D1 means the > payload is an OAM packet. ____ > > __ __ > > However, this is independent of the Metadata, > since some > Metadata can be OAM-ish (as a timestamp). And > this is also > independent of a NULL payload as in Adrian=92s > draft.____ > > __ __ > > A user packet with OAM-ish metadata will have > O=3D0.____ > > __ __ > > The text can always be polished more =97 I am no= t > sure if we > might be in diminishing return territory.____ > > __ __ > > (I would not oppose a clarification that speaks > to the > metadata independence of O for user packets, > although maybe > that does belong in other documents)____ > > __ __ > > Thanks!____ > > __ __ > > Carlos.____ > > __ __ > > On Jul 1, 2017, at 5:26 PM, Andrew G. Malis > >> wrote:____ > > __ __ > > Joel, ____ > > __ __ > > I would like to suggest changing:____ > > __ __ > > O bit: Setting this bit indicates an > Operations, > Administration, and > Maintenance (OAM) packet. The actual > packet format > and processing of > SFC OAM messages is outside the scope of thi= s > specification (see > [oam-frame]).____ > > __ __ > > to:____ > > __ __ > > O bit: Setting this bit indicates the > presence of > Operations, Administration, and > Maintenance (OAM) information. The > actual OAM > information format and processing____ > > is outside the scope of this > specification (see [oam-frame]).____ > > __ __ > > __ __ > > The reason for this change is that we don=92= t > yet know if > the format of OAM information, and whether > it will be in > metadata, packet contents, or both. Thus, > we don=92t yet > even know if there will be =93OAM packets=94 > per se, as data > packets could possibly also carry OAM > information in the > metadata.____ > > __ __ > > If this change is acceptable, then the > following two > paragraphs should also be amended to:____ > > __ __ > > SF/SFF/SFC Proxy/Classifer > implementations that do not > support SFC > OAM procedures SHOULD discard packets > with O bit set, > but MAY support > a configurable parameter to enable > forwarding received > packets with the O bit____ > > set unmodified to the next element in > the chain. Forwarding > packets with the O bit set unmodified by > SFC elements > that do not support SFC OAM > procedures may be acceptable for a > subset of OAM > functions, but can > result in unexpected outcomes for > others, thus it is > recommended to > analyze the impact of forwarding a > packet with the O > bit set for all OAM functions > prior to enabling this behavior. The > configurable > parameter MUST be > disabled by default. > > The O bit MUST be set for packets > containing OAM > information and MUST NOT be set for > packets without OAM information. The O > bit MUST NOT > be modified along the SFP.____ > > __ __ > > __ __ > > Finally, I=92ve seen both =93O bit=94 and O-= bit=94 > used in the > document. The document should choose one.___= _ > > __ __ > > Thanks,____ > > Andy____ > > __ __ > > __ __ > > On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halp= ern > >> wrote:____ > > > The definition of the O bit in the > document is: > > O bit: Setting this bit indicates an > Operations, > Administration, and > Maintenance (OAM) packet. The > actual packet > format and processing of > SFC OAM messages is outside the > scope of this > specification (see > [oam-frame]). > > SF/SFF/SFC Proxy/Classifer > implementations that do > not support SFC > OAM procedures SHOULD discard > packets with O-bit > set, but MAY support > a configurable parameter to enable > forwarding > received SFC OAM > packets unmodified to the next > element in the > chain. Forwarding OAM > packets unmodified by SFC elements > that do not > support SFC OAM > procedures may be acceptable for a > subset of OAM > functions, but can > result in unexpected outcomes for > others, thus it > is recommended to > analyze the impact of forwarding an > OAM packet for > all OAM functions > prior to enabling this behavior. > The configurable > parameter MUST be > disabled by default. > > The O-bit MUST be set for OAM > packets and MUST NOT > be set for non-OAM > packets. The O-bit MUST NOT be > modified along the > SFP. > > This seems to me a VERY clear > description of when the > bit is to be set, and what handling is > required when > packets with this bit are received at > an NSH support > entity. > > If you consider this wording unclear, > please propose > specific text to improve it. > > Yours, > Joel > > On 7/1/17 5:02 PM, Greg Mirsky wrote:___= _ > > Hi Joel, > by all means, I'm not asking to > hold NSH document > until SFC OAM solutions progress. > But NSH refers > to OAM packet and, in my view, it > is too > ambiguous term. Please consider, > OAM packet may be: > > * control message of active SFC > OAM protocol > carried as payload; > * control message of active SFC > OAM protocol > carried as metadata; > * control information and/or > measurement > results of hybrid SFC OAM > protocol carried as metadata > > If work on OAM framework is > progressing, perhaps > all the OAM related discussion as > well as > allocation of the O-bit itself can > be moved there. > > As co-author of several SFC OAM > drafts I'd note > that none of them has dependency on > where OAM > information must be placed, > metadata or payload. > But clear and unambiguous > definitionsof OAM > packet and interpretation of O-bit > are very much > needed and will help to progress > SFC OAM solutions. > > Regards, > Greg____ > > On Sat, Jul 1, 2017 at 1:21 PM, > Joel M. Halpern > > > > > >>> wrote: > > Greg, the editors are working > on the revision > of the OAM Framework > document. > > > More importantly, we have been > careful that > the NSH document does > not normatively depend upon the = OAM > specification. This was > discussed with the working > group several > times, and the OAM wording > in -13 is the result of that > discussion. > > > Are you really asking that we > hold up RFC > publication of the NSH > document until we have > agreement on all of > the complex OAM issues > (such as in-situ, etc.) I > observe a steady > rate of new OAM > proposals, with new behaviors. > That seems to > indicate that such > ahold-up would be almost > indefinite. > > > Yours, > Joel M. Halpern > > On 7/1/17 3:39 PM, Greg Mirsky > wrote: > > Hi Joel, Adrian, et. al, > you'd expect that I'll look > into OAM bit > and wording on OAM > packet first. And so I had. > I'm concerned > that NSH refers to > expired and, frankly, > stalled document > that had not been > discussed for too long. I > believe the NSH > document should have > or refer to clear > definition of SFC OAM > packet before it defines > interpretation of O-bit flag= . > draft-farrel-sfc-convent correctly > points that in current form > O-bit > indicates presence of OAM > information which can be > either as > metadata or as payload. I > believe that we must have > more clear and > deterministic > definition of OAM packet as > current, in > my opinion, may cause > problems for HW-based SFC > OAM support. > > Regards, > Greg > > On Thu, Jun 29, 2017 at > 4:22 PM, Joel > Halpern Direct > > > > > >>____ > > > > > > > > >>>> wrote: > > The -13 will be out in > a few days > with all the changes. > That is what we will > ask the WG to > review. > If we already had it > out, we would > have already asked for > the WG to > take a last look. > > Yours, > Joel > > > On 6/29/17 7:21 PM, > Greg Mirsky wrote: > > Hi Joel, > is the -12 the > latest published > version of the NSH > draft? As I > see, it is missing > TTL and all > related changes: > > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > > >> > https://www.ietf.org/mailman/listinfo/sfc > > > > > > > > >> > > ____ > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > >____ > > __ __ > > ____________________________________________= ___ > sfc mailing list > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > >____ > > __ __ > > =97____ > > Carlos Pignataro, carlos@cisco.com > > > > /=93Sometimes I use big words that I do not full= y > understand, > to make myself sound more photosynthesis."/____ > > __ __ > > __ __ > > > > =97 > Carlos Pignataro, carlos@cisco.com > > > > /=93Sometimes I use big words that I do not fully understand, > to make myself sound more photosynthesis."/ > > > =97 > Carlos Pignataro, carlos@cisco.com > > > > /=93Sometimes I use big words that I do not fully understand, to > make myself sound more photosynthesis."/ > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Fri Jul 7 07:15:40 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BC94213146C for ; Fri, 7 Jul 2017 07:15:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dyZKrzQiKYJE for ; Fri, 7 Jul 2017 07:15:35 -0700 (PDT) Received: from alln-iport-5.cisco.com (alln-iport-5.cisco.com [173.37.142.92]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EF0A0128CFF for ; Fri, 7 Jul 2017 07:15:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=82144; q=dns/txt; s=iport; t=1499436934; x=1500646534; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=nj6vHUHsYk2u5HZVH8nIR/9bVKgp6OzbdzhN3I1Safs=; b=TTnQ7IvGlDmyteELObW978NakG7MbzlAfhknpbkLCTBaruBCivuBedya 7Sk7Dfah8qbIjPK90OUYmlXxq7fw7VqUGbvMfmWa+8xhYu+qjbpamGQsb eufquChNPc2Sj6/ivoEyQuOoMBtg0qlCAFbCcIXgA3qjerL9/Q7scCV8B w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CzAAColl9Z/4kNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm8+LWSBFAeDaYoZkWqILo1VghEhAQqFcAIagys/GAECAQEBAQE?= =?us-ascii?q?BAWsohRgBAQEBAwEBDAwBCEICBwsQAgEIEQQBASEBBgMCAgIfBgsUCQgCBA4FG?= =?us-ascii?q?4kwTAMVELAUgiaHMQ2DcwEBAQEBAQEBAQEBAQEBAQEBAQEBARgFgyiDTIFhK4J?= =?us-ascii?q?5gleBdgEBUYJdMIIxBYlTe4dehQmHLTsCiwuED4RuggyFS4pJi3eJQgEfOIEKd?= =?us-ascii?q?RVJEgGERzkcgWd2AYZtgSOBDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,323,1496102400"; d="scan'208,217";a="449908029" Received: from alln-core-4.cisco.com ([173.36.13.137]) by alln-iport-5.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 07 Jul 2017 14:15:33 +0000 Received: from XCH-RTP-019.cisco.com (xch-rtp-019.cisco.com [64.101.220.159]) by alln-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id v67EFXEu006559 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 7 Jul 2017 14:15:33 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-019.cisco.com (64.101.220.159) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Jul 2017 10:15:32 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Fri, 7 Jul 2017 10:15:32 -0400 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: Dave Dolson , "Joel M. Halpern" , "Andrew G. Malis" , "sfc@ietf.org" , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAACAiAgACt5YA= Date: Fri, 7 Jul 2017 14:15:32 +0000 Message-ID: <9BDAD814-FE08-42A9-8AC4-56191F85D69A@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <3bded8cb-af40-d7ae-96d5-64135b51aceb@joelhalpern.com> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.150.49.207] Content-Type: multipart/alternative; boundary="_000_9BDAD814FE0842A98AC456191F85D69Aciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 14:15:39 -0000 --_000_9BDAD814FE0842A98AC456191F85D69Aciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksIEdyZWcsDQoNCkkgZmVlbCBJ4oCZdmUgYmVlbiBvbiB0aGlzIG1hcnJ5LWdvLXJvdW5kIGJl Zm9yZeKApiB0d2ljZSBhbHJlYWR5IGF0IGxlYXN0Lg0KDQpZb3Ugc2F5Og0KDQpJIGhhZCBwb2lu dGVkIHRoYXQNCg0KWWVzLCB5b3UgaGFkLiBCdXQgcmVwZXRpdGlvbiBvZiB0aGUgc2FtZSBwb2lu dCBhZC1uYXVzZWF1bSB3aGVuIHRoZSBXRyBhZ3JlZWQgb24gYW4gYXBwcm9hY2ggaXMgZGlzdHJh Y3RpbmcgYW5kIHVuaGVscGZ1bC4NCg0KdGhlIE5TSCBkb2N1bWVudCBkb2Vzbid0IHByb3ZpZGUg 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XCH-RTP-017.cisco.com (xch-rtp-017.cisco.com [64.101.220.157]) by alln-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id v67EMo4E003625 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 7 Jul 2017 14:22:50 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Jul 2017 10:22:49 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Fri, 7 Jul 2017 10:22:49 -0400 From: "Carlos Pignataro (cpignata)" To: "Joel M. Halpern" CC: Greg Mirsky , "Andrew G. Malis" , "sfc@ietf.org" , Dave Dolson , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIAArIoA Date: Fri, 7 Jul 2017 14:22:49 +0000 Message-ID: <9D42FA9C-5FA9-4F29-8947-BFACF147716F@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> In-Reply-To: <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.150.49.207] Content-Type: multipart/alternative; boundary="_000_9D42FA9C5FA94F298947BFACF147716Fciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 14:23:28 -0000 --_000_9D42FA9C5FA94F298947BFACF147716Fciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SSBhZ3JlZSB3aXRoIHRoaXMgcG9pbnQsIGFzIGl0IGRvZXMgbm90IGxvY2sgTlNIIGFuZCBnaXZl cyBmdXR1cmUgcHJvb2YgYW5kIGZsZXhpYmlsaXR5IGZvciBPQU0uDQoNCkdyZWcsIHlvdSBhZGRl ZDoNCg0KSSwgZm9yIG9uZSwgd2lsbCBzdXBwb3J0IHRoZSBkZWZpbml0aW9uIG9mIFNGQyBPQU0g 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Halpern" , Greg Mirsky , "Andrew G. Malis" , "James N Guichard" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIAAZxA/gABHxoA= Date: Fri, 7 Jul 2017 14:31:01 +0000 Message-ID: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <20170707141406.5144657.95230.22069@sandvine.com> In-Reply-To: <20170707141406.5144657.95230.22069@sandvine.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: 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([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8WIUBYtdbgd4 for ; Fri, 7 Jul 2017 07:51:38 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4A454128AB0 for ; Fri, 7 Jul 2017 07:51:38 -0700 (PDT) Received: from BLR-EXCHP-2.sandvine.com (192.168.196.172) by WTL-EXCHP-3.sandvine.com (192.168.196.177) with Microsoft SMTP Server (TLS) id 14.3.319.2; Fri, 7 Jul 2017 10:51:37 -0400 Received: from WTL-EXCHP-1.sandvine.com ([fe80::ac6b:cc1e:f2ff:93aa]) by blr-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Fri, 7 Jul 2017 10:51:36 -0400 From: Dave Dolson To: "Carlos Pignataro (cpignata)" CC: "Joel M. Halpern" , Greg Mirsky , "Andrew G. Malis" , "James N Guichard" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIAAZxA/gABHxoD//8Kypw== Date: Fri, 7 Jul 2017 14:51:35 +0000 Message-ID: <20170707145135.5144657.21559.22090@sandvine.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <20170707141406.5144657.95230.22069@sandvine.com>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_2017070714513551446572155922090sandvinecom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 14:51:43 -0000 --_000_2017070714513551446572155922090sandvinecom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable My point is we can at least clearly define the requirements of a compliant = implementation when O=3D0. And if we don't define what to do when O=3D1, we must preclude it from bein= g used. A later document will define that, thereby updating the current doc= ument. At this time O really is a reserved bit, or at best Experimental for OAM. David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Friday, July 7, 2017 10:31 AM To: Dave Dolson Cc: Joel M. Halpern; Greg Mirsky; Andrew G. Malis; James N Guichard; sfc@ie= tf.org Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague] Hi, Dave, On Jul 7, 2017, at 10:14 AM, Dave Dolson > wrote: Earlier I suggested that if OAM=3D0, it is guaranteed that any SFC forwardi= ng agent needs only consider the SPI and SI. If O=3D0, all the text from draft-ietf-sfc-nsh applies. In other words, O is the slow-path bit, if you think of ASICs and handling = exceptional cases in software. I think this is too implementation of a consideration for the spec. I do no= t think a definition at this level is about processing paths and exception = paths. OAM might not be an exceptional case and some OAMs can be/are ASIC p= rocessed. This is why my belief is that for the base NSH document, we should strongly= avoid the temptation (that I also have) to go into OAM details (format, pr= ocessing, etc). Thanks, Carlos. David Dolson Sandvine Original Message From: Joel M. Halpern Sent: Friday, July 7, 2017 12:05 AM To: Greg Mirsky Cc: Carlos Pignataro (cpignata); Andrew G. Malis; sfc@ietf.org; Dave Dolson; James N Guichard Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague] I would have to see specific text. I am personally not happy with the wording you suggested recently that an OAM packet is one where the OAM payload follows the NSH header. The point of the bit is that it tells the NSH processing entity that it is required to do extra work. The point of the bit is NOT to tell it what extra work is required, or where to look for extra information. And by keeping that separation, we get significant flexibility in how we address various cases. And we can evaluate the behaviors we want for the different situations, and set the bit appropriately for our desired behavior. Yours, Joel On 7/6/17 11:59 PM, Greg Mirsky wrote: Hi Joel, considering that we have active and hybrid OAM mechanisms under discussion, the clear definition of what SFC OAM packet must be, in my view, in the NSH document. I, for one, will support the definition of SFC OAM packet as active OAM packet that is specifically generated for OAM purpose and whose scope is limited by the SFC domain. Regards, Greg On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Halpern > wrote: The current text says rather more than just "the O bit must be zero". It prescribes what behavior should be implemented in NSH devices for processing packets where the O bit is set. Which we were specifically asked to provide. Speaking personally, I prefer that the OAM text in the NSH document not specify where the OAM information is carried. While some folks have assumptions about where the information will reside, we have not agreed on that. Yours, Joel On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote: Correct practically =97 zero for user packets. And I believe that=92s what this says (using more words): O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [I-D.ietf-sfc-oam-framework]). The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O-bit MUST NOT be modified along the SFP. Thanks, =97 Carlos. On Jul 6, 2017, at 11:20 PM, Dave Dolson >> wrote: Practically, "The O-bit MUST be zero." Until OAM for NSH is defined. Isn't that where we are at? David Dolson Sandvine *From: *Carlos Pignataro (cpignata) *Sent: *Thursday, July 6, 2017 11:14 PM *To: *Greg Mirsky *Cc: *Joel M. Halpern; Andrew G. Malis; sfc@ietf.org >; James N Guichard *Subject: *Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thanks Greg and Jim. I would like to close on this item. For clarity, what you (Greg) are proposing is the addition of the following text: =93SFC OAM packet is the packet that has OAM payload immediately following NSH. In all other cases, i.e. when the payload is not OAM, the O-bit MUST be reset.=94 And while at first glance it sounds like a potentially useful or at least non-harmful addition, very similar text already exists one paragraph below: =93The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O-bit MUST NOT be modified along the SFP.=94 I prefer to specify as little as possible of OAM here, since we are already pointing to a spec that would detail this processing. Things like =93immediately following=94 can be specified in the OAM document. As it is now, what O means is clear and aligns with what I wrote below. Additionally, I=92d much rather not change the text that was worked through iterations and consensus. However, I suggest we can move up that sentence one paragraph up to improve the flow and make it explicitly clear: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [I-D.ietf-sfc-oam-framework]). + The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM + packets. The O-bit MUST NOT be modified along the SFP. + SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. - The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM - packets. The O-bit MUST NOT be modified along the SFP. - Thoughts on this proposal? It seems to achieve the right balance of not over specify but bring clarity. Thanks, =97 Carlos. On Jul 6, 2017, at 10:07 PM, Greg Mirsky >> wrote: Hi Jim, I can give my interpretation of what Carlos had proposed and how his clarification may be reflected in the document: OLD: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). NEW: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. SFC OAM packet is the packet that has OAM payload immediately following NSH. In all other cases, i.e. when the payload is not OAM, the O-bit MUST be reset. The actual packet format and processing of SFC OAM messages are outside the scope of this specification (see [oam-frame]). Regards, Greg On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard >> wrote: Hi Greg/Carlos,____ __ __ It is difficult to tell from this thread whether a textual change is being proposed or if the current text is sufficient; please can you clarify for the WG and if a textual change is being proposed please clearly state what this is so that the WG can evaluate and we can move forward.____ __ __ Many thanks!____ __ __ Jim____ __ __ *From:*sfc [mailto:sfc-bounces@ietf.org >] *On Behalf Of *Greg Mirsky *Sent:* Tuesday, July 04, 2017 1:41 AM *To:* Carlos Pignataro (cpignata) >> *Cc:* Joel M. Halpern >>; Andrew G. Malis >>; sfc@ietf.org > *Subject:* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague]____ __ __ Hi Carlos,____ you have valid interpretation of the text in its current version. And I think that if it was in the document as you have presented (or very close to it), it would address my concern, as you've provided clear and unambiguous definition of what considered as OAM packet in SFC - packet that carries OAM information as payload that immediately follows the NSH.____ __ __ Regards,____ Greg____ __ __ On Mon, Jul 3, 2017 at 5:37 PM, Carlos Pignataro (cpignata) >> wrote:____ Hi Andy, ____ __ __ I believe that s/packet/information/ can actually cause more confusion that bring clarity.____ __ __ O=3D0 means that the payload is a user packet. O=3D1 means the payload is an OAM packet. ____ __ __ However, this is independent of the Metadata, since some Metadata can be OAM-ish (as a timestamp). And this is also independent of a NULL payload as in Adrian=92s draft.____ __ __ A user packet with OAM-ish metadata will have O=3D0.____ __ __ The text can always be polished more =97 I am not sure if we might be in diminishing return territory.____ __ __ (I would not oppose a clarification that speaks to the metadata independence of O for user packets, although maybe that does belong in other documents)____ __ __ Thanks!____ __ __ Carlos.____ __ __ On Jul 1, 2017, at 5:26 PM, Andrew G. Malis >> wrote:____ __ __ Joel, ____ __ __ I would like to suggest changing:____ __ __ O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]).____ __ __ to:____ __ __ O bit: Setting this bit indicates the presence of Operations, Administration, and Maintenance (OAM) information. The actual OAM information format and processing____ is outside the scope of this specification (see [oam-frame]).____ __ __ __ __ The reason for this change is that we don=92t yet know if the format of OAM information, and whether it will be in metadata, packet contents, or both. Thus, we don=92t yet even know if there will be =93OAM packets=94 per se, as data packets could possibly also carry OAM information in the metadata.____ __ __ If this change is acceptable, then the following two paragraphs should also be amended to:____ __ __ SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O bit set, but MAY support a configurable parameter to enable forwarding received packets with the O bit____ set unmodified to the next element in the chain. Forwarding packets with the O bit set unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding a packet with the O bit set for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O bit MUST be set for packets containing OAM information and MUST NOT be set for packets without OAM information. The O bit MUST NOT be modified along the SFP.____ __ __ __ __ Finally, I=92ve seen both =93O bit=94 and O-bit= =94 used in the document. The document should choose one.____ __ __ Thanks,____ Andy____ __ __ __ __ On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern >> wrote:____ The definition of the O bit in the document is: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual packet format and processing of SFC OAM messages is outside the scope of this specification (see [oam-frame]). SF/SFF/SFC Proxy/Classifer implementations that do not support SFC OAM procedures SHOULD discard packets with O-bit set, but MAY support a configurable parameter to enable forwarding received SFC OAM packets unmodified to the next element in the chain. Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The configurable parameter MUST be disabled by default. The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O-bit MUST NOT be modified along the SFP. This seems to me a VERY clear description of when the bit is to be set, and what handling is required when packets with this bit are received at an NSH support entity. If you consider this wording unclear, please propose specific text to improve it. Yours, Joel On 7/1/17 5:02 PM, Greg Mirsky wrote:____ Hi Joel, by all means, I'm not asking to hold NSH document until SFC OAM solutions progress. But NSH refers to OAM packet and, in my view, it is too ambiguous term. Please consider, OAM packet may be: * control message of active SFC OAM protocol carried as payload; * control message of active SFC OAM protocol carried as metadata; * control information and/or measurement results of hybrid SFC OAM protocol carried as metadata If work on OAM framework is progressing, perhaps all the OAM related discussion as well as allocation of the O-bit itself can be moved there. As co-author of several SFC OAM drafts I'd note that none of them has dependency on where OAM information must be placed, metadata or payload. But clear and unambiguous definitionsof OAM packet and interpretation of O-bit are very much needed and will help to progress SFC OAM solutions. Regards, Greg____ On Sat, Jul 1, 2017 at 1:21 PM, Joel M. Halpern > >>> wrote: Greg, the editors are working on the revision of the OAM Framework document. More importantly, we have been careful that the NSH document does not normatively depend upon the OAM specification. This was discussed with the working group several times, and the OAM wording in -13 is the result of that discussion. Are you really asking that we hold up RFC publication of the NSH document until we have agreement on all of the complex OAM issues (such as in-situ, etc.) I observe a steady rate of new OAM proposals, with new behaviors. That seems to indicate that such ahold-up would be almost indefinite. Yours, Joel M. Halpern On 7/1/17 3:39 PM, Greg Mirsky wrote: Hi Joel, Adrian, et. al, you'd expect that I'll look into OAM bit and wording on OAM packet first. And so I had. I'm concerned that NSH refers to expired and, frankly, stalled document that had not been discussed for too long. I believe the NSH document should have or refer to clear definition of SFC OAM packet before it defines interpretation of O-bit flag. draft-farrel-sfc-convent correctly points that in current form O-bit indicates presence of OAM information which can be either as metadata or as payload. I believe that we must have more clear and deterministic definition of OAM packet as current, in my opinion, may cause problems for HW-based SFC OAM support. Regards, Greg On Thu, Jun 29, 2017 at 4:22 PM, Joel Halpern Direct > >>____ > >>>> wrote: The -13 will be out in a few days with all the changes. That is what we will ask the WG to review. If we already had it out, we would have already asked for the WG to take a last look. Yours, Joel On 6/29/17 7:21 PM, Greg Mirsky wrote: Hi Joel, is the -12 the latest published version of the NSH draft? As I see, it is missing TTL and all related changes: _______________________________________________ sfc mailing list sfc@ietf.org > >> https://www.ietf.org/mailman/listinfo/sfc > >> ____ _______________________________________________ sfc mailing list sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc >____ __ __ _______________________________________________ sfc mailing list sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc >____ __ __ =97____ Carlos Pignataro, carlos@cisco.com > /=93Sometimes I use big words that I do not fully understand, to make myself sound more photosynthesis."/____ __ __ __ __ =97 Carlos Pignataro, carlos@cisco.com > /=93Sometimes I use big words that I do not fully understand, to make myself sound more photosynthesis."/ =97 Carlos Pignataro, carlos@cisco.com > /=93Sometimes I use big words that I do not fully understand, to make myself sound more photosynthesis."/ _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc =97 Carlos Pignataro, carlos@cisco.com =93Sometimes I use big words that I do not fully understand, to make myself= sound more photosynthesis." --_000_2017070714513551446572155922090sandvinecom_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
David Dolson
Sandvine
From: Carlos Pignataro (cpignata)
Sent: Friday, July 7, 2017 10:31 AM
To: Dave Dolson
Cc: Joel M. Halpern; Greg Mirsky; Andrew G. Malis; James N Guic= hard; sfc@ietf.org
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting a= t IETF 99 in Prague]

Hi, Dave,


On Jul 7, 2017, at 10:14 AM, Dave Dolson <ddolson@sandvine.com> wrote:
Earlier I suggested that if OAM=3D0, it is guaranteed that = any SFC forwarding agent needs only consider the SPI and SI.


If O=3D0, all the text from draft-ietf-sfc-nsh applies.

In other words, O is the slow-path bit, if you think of ASI= Cs and handling exceptional cases in software.



I think this is too implementation of a consideration for the spec. I = do not think a definition at this level is about processing paths and excep= tion paths. OAM might not be an exceptional case and some OAMs can be/are A= SIC processed. 

This is why my belief is that for the base NSH document, we should str= ongly avoid the temptation (that I also have) to go into OAM details (forma= t, processing, etc).

Thanks,

Carlos.




David Dolson
Sandvine
 Original Message
From: Joel M. Halpern
Sent: Friday, July 7, 2017 12:05 AM
To: Greg Mirsky
Cc: Carlos Pignataro (cpignata); Andrew G. Malis; sfc@ietf.org; Dave Dolson; James N Guichard
Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in= Prague]


<all of the below without WG chair hat>
I would have to see specific text.  I am personally not happy with the=
wording you suggested recently that an OAM packet is one where the OAM
payload follows the NSH header.

The point of the bit is that it tells the NSH processing entity that it
is required to do extra work.  The point of the bit is NOT to tell it<= br class=3D""> what extra work is required, or where to look for extra information.
And by keeping that separation, we get significant flexibility in how we address various cases.  And we can evaluate the behaviors we want for<= br class=3D""> the different situations, and set the bit appropriately for our desired
behavior.

Yours,
Joel

On 7/6/17 11:59 PM, Greg Mirsky wrote:
Hi Joel,
considering that we have active and hybrid OAM mechanisms under
discussion, the clear definition of what SFC OAM packet must be, in my
view, in the NSH document. I, for one, will support the definition of
SFC OAM packet as active OAM packet that is specifically generated for
OAM purpose and whose scope is limited by the SFC domain.

Regards,
Greg

On Thu, Jul 6, 2017 at 8:48 PM, Joel M. Halpern <jmh@joelhalpern.com
<mailto:jmh@joelhalper= n.com>> wrote:

   The current text says rather more than just "the O b= it must be
   zero". It prescribes what behavior should be impleme= nted in NSH
   devices for processing packets where the O bit is set. &n= bsp;Which we
   were specifically asked to provide.

   Speaking personally, I prefer that the OAM text in the NS= H document
   not specify where the OAM information is carried.  W= hile some folks
   have assumptions about where the information will reside,= we have
   not agreed on that.

   Yours,
   Joel

   On 7/6/17 11:24 PM, Carlos Pignataro (cpignata) wrote:
       Correct practically =97 zero for = user packets.

       And I believe that=92s what this = says (using more words):

            &nb= sp;O bit: Setting this bit indicates an Operations,
       Administration, and
            &nb= sp;Maintenance (OAM) packet.  The actual packet format and
       processing of
            &nb= sp;SFC OAM messages is outside the scope of this
       specification (see
            &nb= sp;[I-D.ietf-sfc-oam-framework]).

            &nb= sp;The O-bit MUST be set for OAM packets and MUST NOT be set
       for non-OAM
            &nb= sp;packets.  The O-bit MUST NOT be modified along the SFP.


       Thanks,

       =97 Carlos.

           On Jul 6,= 2017, at 11:20 PM, Dave Dolson
           <ddolson@sandvine.com <= mailto:ddolson@sandvine.= com>
           <mailto:ddolson@sandvine.com <mailto:ddolson@sa= ndvine.com>>>
           wrote:
           Practical= ly, "The O-bit MUST be zero." Until OAM for NSH is
           defined.<= br class=3D"">            Isn't tha= t where we are at?



           David Dol= son
           Sandvine<= br class=3D"">            *From: *C= arlos Pignataro (cpignata)
           *Sent: *T= hursday, July 6, 2017 11:14 PM
           *To: *Gre= g Mirsky
           *Cc: *Joe= l M. Halpern; Andrew G. Malis; sfc@ietf.org
           <mailto:sfc@ietf.org> <mailto:sfc@ietf.org
           <mailto:sfc@ietf.org>>; Jame= s N Guichard
           *Subject:= *Re: [sfc] Status of draft-ietf-sfc-nsh [Was:
           Meeting a= t IETF 99 in Prague]



           Thanks Gr= eg and Jim. I would like to close on this item.

           For clari= ty, what you (Greg) are proposing is the addition
           of the fo= llowing text:

           =93SFC OA= M packet is the packet that has OAM payload
           immediate= ly following NSH.  In all other cases, i.e. when
           the paylo= ad is not OAM, the O-bit MUST be reset.=94

           And while= at first glance it sounds like a potentially
           useful or= at least non-harmful addition, very similar text
           already e= xists one paragraph below:

           =93The O-= bit MUST be set for OAM packets and MUST NOT be set
           for non-O= AM packets.  The O-bit MUST NOT be modified along
           the SFP.= =94

           I prefer = to specify as little as possible of OAM here, since
           we are al= ready pointing to a spec that would detail this
           processin= g. Things like =93immediately following=94 can be
           specified= in the OAM document. As it is now, what O means is
           clear and= aligns with what I wrote below.

           Additiona= lly, I=92d much rather not change the text that was
           worked th= rough iterations and consensus. However, I suggest
           we can mo= ve up that sentence one paragraph up to improve the
           flow and = make it explicitly clear:


            &nb= sp;   O bit: Setting this bit indicates an Operations,
           Administr= ation, and
            &nb= sp;   Maintenance (OAM) packet.  The actual packet form= at and
           processin= g of
            &nb= sp;   SFC OAM messages is outside the scope of this
           specifica= tion (see
            &nb= sp;   [I-D.ietf-sfc-oam-framework]).

           + &nb= sp; The O-bit MUST be set for OAM packets and MUST NOT be
           set for n= on-OAM
           + &nb= sp; packets.  The O-bit MUST NOT be modified along the SFP.
           +
            &nb= sp;   SF/SFF/SFC Proxy/Classifer implementations that do not=
           support S= FC
            &nb= sp;   OAM procedures SHOULD discard packets with O-bit set,<= br class=3D"">            but MAY s= upport
            &nb= sp;   a configurable parameter to enable forwarding received=
           SFC OAM             &nb= sp;   packets unmodified to the next element in the chain.            Forwardin= g OAM
            &nb= sp;   packets unmodified by SFC elements that do not support=
           SFC OAM             &nb= sp;   procedures may be acceptable for a subset of OAM
           functions= , but can
            &nb= sp;   result in unexpected outcomes for others, thus it is            recommend= ed to
            &nb= sp;   analyze the impact of forwarding an OAM packet for all=
           OAM funct= ions
            &nb= sp;   prior to enabling this behavior.  The configurabl= e
           parameter= MUST be
            &nb= sp;   disabled by default.

           -  &= nbsp;The O-bit MUST be set for OAM packets and MUST NOT be
           set for n= on-OAM
           -  &= nbsp;packets.  The O-bit MUST NOT be modified along the SFP.
           -

           Thoughts = on this proposal? It seems to achieve the right
           balance o= f not over specify but bring clarity.

           Thanks,
           =97 Carlo= s.


            &nb= sp;  On Jul 6, 2017, at 10:07 PM, Greg Mirsky
            &nb= sp;  <greg= imirsky@gmail.com <mailto:gregimirsky@gmail.com>
            &nb= sp;  <mail= to:gregimirsky@gmail.com
            &nb= sp;  <mail= to:gregimirsky@gmail.com>>> wrote:

            &nb= sp;  Hi Jim,
            &nb= sp;  I can give my interpretation of what Carlos had proposed
            &nb= sp;  and how his clarification may be reflected in the document:<= br class=3D"">             &nb= sp;  OLD:
            &nb= sp;  O bit: Setting this bit indicates an Operations,
            &nb= sp;  Administration, and Maintenance (OAM) packet. The actual
            &nb= sp;  packet format and processing of SFC OAM messages is
            &nb= sp;  outside the scope of this specification (see [oam-frame]).             &nb= sp;  NEW:
            &nb= sp;  O bit: Setting this bit indicates an Operations,
            &nb= sp;  Administration, and Maintenance (OAM) packet. SFC OAM
            &nb= sp;  packet is the packet that has OAM payload immediately
            &nb= sp;  following NSH. In all other cases, i.e. when the payload
            &nb= sp;  is not OAM, the O-bit MUST be reset. The actual packet
            &nb= sp;  format and processing of SFC OAM messages are outside
            &nb= sp;  the scope of this specification (see [oam-frame]).
            &nb= sp;  Regards,
            &nb= sp;  Greg

            &nb= sp;  On Wed, Jul 5, 2017 at 8:45 AM, James N Guichard
            &nb= sp;  <james.n.guichard@huawei.com
            &nb= sp;  <mailto:james.n.guichard@huawei.com>
            &nb= sp;  <mailto:james.n.guichard@huawei.com
            &nb= sp;  <mailto:james.n.guichard@huawei.com>>> wrote:

            &nb= sp;       Hi Greg/Carlos,____

            &nb= sp;       __ __

            &nb= sp;       It is difficult to tell from t= his thread whether a
            &nb= sp;  textual change
            &nb= sp;       is being proposed or if the cu= rrent text is
            &nb= sp;  sufficient; please
            &nb= sp;       can you clarify for the WG and= if a textual change
            &nb= sp;  is being
            &nb= sp;       proposed please clearly state = what this is so that
            &nb= sp;  the WG can
            &nb= sp;       evaluate and we can move forwa= rd.____

            &nb= sp;       __ __

            &nb= sp;       Many thanks!____

            &nb= sp;       __ __

            &nb= sp;       Jim____

            &nb= sp;       __ __

            &nb= sp;       *From:*sfc [mailto:sfc-bounces@ietf.org
            &nb= sp;  <mailt= o:sfc-bounces@ietf.org>
            &nb= sp;       <mailto:sfc-bounces@ietf.org
            &nb= sp;  <mailt= o:sfc-bounces@ietf.org>>] *On Behalf Of *Greg Mirsky
            &nb= sp;       *Sent:* Tuesday, July 04, 2017= 1:41 AM
            &nb= sp;       *To:* Carlos Pignataro (cpigna= ta)
            &nb= sp;  <cpignat= a@cisco.com <mailto= :cpignata@cisco.com>
            &nb= sp;       <mailto:cpignata@cisco.com
            &nb= sp;  <mailto:= cpignata@cisco.com>>>
            &nb= sp;       *Cc:* Joel M. Halpern <jmh@joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com>
            &nb= sp;       <mailto:jmh@joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com>>>; Andrew G. Malis
            &nb= sp;  <agmalis@= gmail.com <mailto:ag= malis@gmail.com>
            &nb= sp;       <mailto:agmalis@gmail.com
            &nb= sp;  <mailto:a= gmalis@gmail.com>>>; sfc@ietf.org
            &nb= sp;  <mailto:sfc@ie= tf.org> <mailto:sfc@ie= tf.org
            &nb= sp;  <mailto:sfc@ie= tf.org>>
            &nb= sp;       *Subject:* Re: [sfc] Status of= draft-ietf-sfc-nsh
            &nb= sp;  [Was: Meeting
            &nb= sp;       at IETF 99 in Prague]____

            &nb= sp;       __ __

            &nb= sp;       Hi Carlos,____

            &nb= sp;       you have valid interpretation = of the text in its
            &nb= sp;  current version.
            &nb= sp;       And I think that if it was in = the document as you
            &nb= sp;  have presented
            &nb= sp;       (or very close to it), it woul= d address my concern,
            &nb= sp;  as you've
            &nb= sp;       provided clear and unambiguous= definition of what
            &nb= sp;  considered as
            &nb= sp;       OAM packet in SFC - packet tha= t carries OAM
            &nb= sp;  information as
            &nb= sp;       payload that immediately follo= ws the NSH.____

            &nb= sp;       __ __

            &nb= sp;       Regards,____

            &nb= sp;       Greg____

            &nb= sp;       __ __

            &nb= sp;       On Mon, Jul 3, 2017 at 5:37 PM= , Carlos Pignataro
            &nb= sp;  (cpignata)
            &nb= sp;       <cpignata@cisco.com <mailto:cpignata@cisco.com>
            &nb= sp;  <mailto:= cpignata@cisco.com <mailto:cpignata@cisco.com>>>
            &nb= sp;  wrote:____

            &nb= sp;           Hi And= y, ____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           I beli= eve that s/packet/information/ can
            &nb= sp;  actually cause more
            &nb= sp;           confus= ion that bring clarity.____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           O=3D0 = means that the payload is a user packet.
            &nb= sp;  O=3D1 means the
            &nb= sp;           payloa= d is an OAM packet. ____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           Howeve= r, this is independent of the Metadata,
            &nb= sp;  since some
            &nb= sp;           Metada= ta can be OAM-ish (as a timestamp). And
            &nb= sp;  this is also
            &nb= sp;           indepe= ndent of a NULL payload as in Adrian=92s
            &nb= sp;  draft.____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           A user= packet with OAM-ish metadata will have
            &nb= sp;  O=3D0.____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           The te= xt can always be polished more =97 I am not
            &nb= sp;  sure if we
            &nb= sp;           might = be in diminishing return territory.____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           (I wou= ld not oppose a clarification that speaks
            &nb= sp;  to the
            &nb= sp;           metada= ta independence of O for user packets,
            &nb= sp;  although maybe
            &nb= sp;           that d= oes belong in other documents)____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           Thanks= !____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           Carlos= .____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;            =    On Jul 1, 2017, at 5:26 PM, Andrew G. Malis
            &nb= sp;            =    <agmal= is@gmail.com
            &nb= sp;  <mailto:a= gmalis@gmail.com> <mailto:agmalis@gmail.com
            &nb= sp;  <mailto:a= gmalis@gmail.com>>> wrote:____

            &nb= sp;            =    __ __

            &nb= sp;            =    Joel, ____

            &nb= sp;            =    __ __

            &nb= sp;            =    I would like to suggest changing:____

            &nb= sp;            =    __ __

            &nb= sp;            =    O bit: Setting this bit indicates an
            &nb= sp;  Operations,
            &nb= sp;            =    Administration, and
            &nb= sp;            =       Maintenance (OAM) packet.  The act= ual
            &nb= sp;  packet format
            &nb= sp;            =    and processing of
            &nb= sp;            =    SFC OAM messages is outside the scope of this
            &nb= sp;            =    specification (see
            &nb= sp;            =       [oam-frame]).____

            &nb= sp;            =    __ __

            &nb= sp;            =    to:____

            &nb= sp;            =    __ __

            &nb= sp;            =    O bit: Setting this bit indicates the
            &nb= sp;  presence of
            &nb= sp;            =    Operations, Administration, and
            &nb= sp;            =       Maintenance (OAM) information.  Th= e
            &nb= sp;  actual OAM
            &nb= sp;            =    information format and processing____

            &nb= sp;            =       is outside the scope of this
            &nb= sp;  specification (see        = ;     [oam-frame]).____

            &nb= sp;            =    __ __

            &nb= sp;            =    __ __

            &nb= sp;            =    The reason for this change is that we don=92t
            &nb= sp;  yet know if
            &nb= sp;            =    the format of OAM information, and whether
            &nb= sp;  it will be in
            &nb= sp;            =    metadata, packet contents, or both. Thus,
            &nb= sp;  we don=92t yet
            &nb= sp;            =    even know if there will be =93OAM packets=94
            &nb= sp;  per se, as data
            &nb= sp;            =    packets could possibly also carry OAM
            &nb= sp;  information in the
            &nb= sp;            =    metadata.____

            &nb= sp;            =    __ __

            &nb= sp;            =    If this change is acceptable, then the
            &nb= sp;  following two
            &nb= sp;            =    paragraphs should also be amended to:____

            &nb= sp;            =    __ __

            &nb= sp;            =       SF/SFF/SFC Proxy/Classifer
            &nb= sp;  implementations that do not
            &nb= sp;            =    support SFC
            &nb= sp;            =       OAM procedures SHOULD discard packets             &nb= sp;  with O bit set,
            &nb= sp;            =    but MAY support
            &nb= sp;            =       a configurable parameter to enable
            &nb= sp;  forwarding received
            &nb= sp;            =    packets with the O bit____

            &nb= sp;            =       set unmodified to the next element in             &nb= sp;  the chain.         &= nbsp;   Forwarding
            &nb= sp;            =       packets with the O bit set unmodified b= y
            &nb= sp;  SFC elements
            &nb= sp;            =    that do not support SFC OAM
            &nb= sp;            =       procedures may be acceptable for a
            &nb= sp;  subset of OAM
            &nb= sp;            =    functions, but can
            &nb= sp;            =       result in unexpected outcomes for
            &nb= sp;  others, thus it is
            &nb= sp;            =    recommended to
            &nb= sp;            =       analyze the impact of forwarding a
            &nb= sp;  packet with the O
            &nb= sp;            =    bit set for all OAM functions
            &nb= sp;            =       prior to enabling this behavior.  = The
            &nb= sp;  configurable
            &nb= sp;            =    parameter MUST be
            &nb= sp;            =       disabled by default.

            &nb= sp;            =       The O bit MUST be set for packets
            &nb= sp;  containing OAM
            &nb= sp;            =    information and MUST NOT be set for
            &nb= sp;            =       packets without OAM information.  = The O
            &nb= sp;  bit MUST NOT
            &nb= sp;            =    be modified along the SFP.____

            &nb= sp;            =    __ __

            &nb= sp;            =    __ __

            &nb= sp;            =    Finally, I=92ve seen both =93O bit=94 and O-bit=94
            &nb= sp;  used in the
            &nb= sp;            =    document. The document should choose one.____

            &nb= sp;            =    __ __

            &nb= sp;            =    Thanks,____

            &nb= sp;            =    Andy____

            &nb= sp;            =    __ __

            &nb= sp;            =    __ __

            &nb= sp;            =    On Sat, Jul 1, 2017 at 5:11 PM, Joel M. Halpern
            &nb= sp;            =    <jmh= @joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com>>> wrote:____


            &nb= sp;            =        The definition of the O bit in th= e
            &nb= sp;  document is:

            &nb= sp;            =        O bit: Setting this bit indicates= an
            &nb= sp;  Operations,
            &nb= sp;            =        Administration, and
            &nb= sp;            =           Maintenance (OA= M) packet.  The
            &nb= sp;  actual packet
            &nb= sp;            =        format and processing of
            &nb= sp;            =           SFC OAM message= s is outside the
            &nb= sp;  scope of this
            &nb= sp;            =        specification (see
            &nb= sp;            =           [oam-frame]).
            &nb= sp;            =           SF/SFF/SFC Prox= y/Classifer
            &nb= sp;  implementations that do
            &nb= sp;            =        not support SFC
            &nb= sp;            =           OAM procedures = SHOULD discard
            &nb= sp;  packets with O-bit
            &nb= sp;            =        set, but MAY support
            &nb= sp;            =           a configurable = parameter to enable
            &nb= sp;  forwarding
            &nb= sp;            =        received SFC OAM
            &nb= sp;            =           packets unmodif= ied to the next
            &nb= sp;  element in the
            &nb= sp;            =        chain.  Forwarding OAM
            &nb= sp;            =           packets unmodif= ied by SFC elements
            &nb= sp;  that do not
            &nb= sp;            =        support SFC OAM
            &nb= sp;            =           procedures may = be acceptable for a
            &nb= sp;  subset of OAM
            &nb= sp;            =        functions, but can
            &nb= sp;            =           result in unexp= ected outcomes for
            &nb= sp;  others, thus it
            &nb= sp;            =        is recommended to
            &nb= sp;            =           analyze the imp= act of forwarding an
            &nb= sp;  OAM packet for
            &nb= sp;            =        all OAM functions
            &nb= sp;            =           prior to enabli= ng this behavior.
            &nb= sp;  The configurable
            &nb= sp;            =        parameter MUST be
            &nb= sp;            =           disabled by def= ault.

            &nb= sp;            =           The O-bit MUST = be set for OAM
            &nb= sp;  packets and MUST NOT
            &nb= sp;            =        be set for non-OAM
            &nb= sp;            =           packets.  = The O-bit MUST NOT be
            &nb= sp;  modified along the
            &nb= sp;            =        SFP.

            &nb= sp;            =        This seems to me a VERY clear
            &nb= sp;  description of when the
            &nb= sp;            =        bit is to be set, and what handli= ng is
            &nb= sp;  required when
            &nb= sp;            =        packets with this bit are receive= d at
            &nb= sp;  an NSH support
            &nb= sp;            =        entity.

            &nb= sp;            =        If you consider this wording uncl= ear,
            &nb= sp;  please propose
            &nb= sp;            =        specific text to improve it.

            &nb= sp;            =        Yours,
            &nb= sp;            =        Joel

            &nb= sp;            =        On 7/1/17 5:02 PM, Greg Mirsky wr= ote:____

            &nb= sp;            =            Hi Joel,<= br class=3D"">             &nb= sp;            =            by all me= ans, I'm not asking to
            &nb= sp;  hold NSH document
            &nb= sp;            =            until SFC= OAM solutions progress.
            &nb= sp;  But NSH refers
            &nb= sp;            =            to OAM pa= cket and, in my view, it
            &nb= sp;  is too
            &nb= sp;            =            ambiguous= term. Please consider,
            &nb= sp;  OAM packet may be:

            &nb= sp;            =             &nb= sp;* control message of active SFC
            &nb= sp;  OAM protocol
            &nb= sp;            =            carried a= s payload;
            &nb= sp;            =             &nb= sp;* control message of active SFC
            &nb= sp;  OAM protocol
            &nb= sp;            =            carried a= s metadata;
            &nb= sp;            =             &nb= sp;* control information and/or
            &nb= sp;  measurement
            &nb= sp;            =            results o= f hybrid SFC OAM
            &nb= sp;            =             &nb= sp;  protocol carried as metadata

            &nb= sp;            =            If work o= n OAM framework is
            &nb= sp;  progressing, perhaps
            &nb= sp;            =            all the O= AM related discussion as
            &nb= sp;  well as
            &nb= sp;            =            allocatio= n of the O-bit itself can
            &nb= sp;  be moved there.

            &nb= sp;            =            As co-aut= hor of several SFC OAM
            &nb= sp;  drafts I'd note
            &nb= sp;            =            that none= of them has dependency on
            &nb= sp;  where OAM
            &nb= sp;            =            informati= on must be placed,
            &nb= sp;  metadata or payload.
            &nb= sp;            =            But clear= and unambiguous
            &nb= sp;  definitionsof OAM
            &nb= sp;            =            packet an= d interpretation of O-bit
            &nb= sp;  are very much
            &nb= sp;            =            needed an= d will help to progress
            &nb= sp;  SFC OAM solutions.

            &nb= sp;            =            Regards,<= br class=3D"">             &nb= sp;            =            Greg____<= br class=3D"">
            &nb= sp;            =            On Sat, J= ul 1, 2017 at 1:21 PM,
            &nb= sp;  Joel M. Halpern
            &nb= sp;            =            <jmh@joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
            &nb= sp;  <mailto= :jmh@joelhalpern.com>>
            &nb= sp;            =            <mailto:jmh@joelhalpern.com=
            &nb= sp;  <mailto= :jmh@joelhalpern.com>

            &nb= sp;            =            <mailto:jmh@joelhalpern.com=
            &nb= sp;  <mailto= :jmh@joelhalpern.com>>>> wrote:

            &nb= sp;            =             &nb= sp;  Greg, the editors are working
            &nb= sp;  on the revision
            &nb= sp;            =            of the OA= M Framework
            &nb= sp;            =             &nb= sp;  document.

            &nb= sp;            =             &nb= sp;  <chair hat on>
            &nb= sp;            =             &nb= sp;  More importantly, we have been
            &nb= sp;  careful that
            &nb= sp;            =            the NSH d= ocument does
            &nb= sp;            =             &nb= sp;  not normatively depend upon the OAM
            &nb= sp;            =            specifica= tion.  This was
            &nb= sp;            =             &nb= sp;  discussed with the working
            &nb= sp;  group several
            &nb= sp;            =            times, an= d the OAM wording
            &nb= sp;            =             &nb= sp;  in -13 is the result of that
            &nb= sp;  discussion.
            &nb= sp;            =             &nb= sp;  </chair hat on>
            &nb= sp;            =             &nb= sp;  <chair hat off>
            &nb= sp;            =             &nb= sp;  Are you really asking that we
            &nb= sp;  hold up RFC
            &nb= sp;            =            publicati= on of the NSH
            &nb= sp;            =             &nb= sp;  document until we have
            &nb= sp;  agreement on all of
            &nb= sp;            =            the compl= ex OAM issues
            &nb= sp;            =             &nb= sp;  (such as in-situ, etc.)  I
            &nb= sp;  observe a steady
            &nb= sp;            =            rate of n= ew OAM
            &nb= sp;            =             &nb= sp;  proposals, with new behaviors.
            &nb= sp;  That seems to
            &nb= sp;            =            indicate = that such
            &nb= sp;            =             &nb= sp;  ahold-up would be almost
            &nb= sp;  indefinite.
            &nb= sp;            =             &nb= sp;  </chair hat off>

            &nb= sp;            =             &nb= sp;  Yours,
            &nb= sp;            =             &nb= sp;  Joel M. Halpern

            &nb= sp;            =             &nb= sp;  On 7/1/17 3:39 PM, Greg Mirsky
            &nb= sp;  wrote:

            &nb= sp;            =             &nb= sp;      Hi Joel, Adrian, et. al,
            &nb= sp;            =             &nb= sp;      you'd expect that I'll look
            &nb= sp;  into OAM bit
            &nb= sp;            =            and wordi= ng on OAM
            &nb= sp;            =             &nb= sp;      packet first. And so I had.
            &nb= sp;  I'm concerned
            &nb= sp;            =            that NSH = refers to
            &nb= sp;            =             &nb= sp;      expired and, frankly,
            &nb= sp;  stalled document
            &nb= sp;            =            that had = not been
            &nb= sp;            =             &nb= sp;      discussed for too long. I
            &nb= sp;  believe the NSH
            &nb= sp;            =            document = should have
            &nb= sp;            =             &nb= sp;      or refer to clear
            &nb= sp;  definition of SFC OAM
            &nb= sp;            =            packet be= fore it defines
            &nb= sp;            =             &nb= sp;      interpretation of O-bit flag.
            &nb= sp;            =            draft-far= rel-sfc-convent correctly
            &nb= sp;            =             &nb= sp;      points that in current form
            &nb= sp;  O-bit
            &nb= sp;            =            indicates= presence of OAM
            &nb= sp;            =             &nb= sp;      information which can be
            &nb= sp;  either as
            &nb= sp;            =            metadata = or as payload. I
            &nb= sp;            =             &nb= sp;      believe that we must have
            &nb= sp;  more clear and
            &nb= sp;            =            determini= stic
            &nb= sp;            =             &nb= sp;      definition of OAM packet as
            &nb= sp;  current, in
            &nb= sp;            =            my opinio= n, may cause
            &nb= sp;            =             &nb= sp;      problems for HW-based SFC
            &nb= sp;  OAM support.

            &nb= sp;            =             &nb= sp;      Regards,
            &nb= sp;            =             &nb= sp;      Greg

            &nb= sp;            =             &nb= sp;      On Thu, Jun 29, 2017 at
            &nb= sp;  4:22 PM, Joel
            &nb= sp;            =            Halpern D= irect
            &nb= sp;            =             &nb= sp;      <jmh.direct@joelhalpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>
            &nb= sp;            =            <mailto:jmh.direct@joelh= alpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>>
            &nb= sp;            =            <mailto:jmh.direct@joelh= alpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>
            &nb= sp;            =            <mailto:jmh.direct@joelh= alpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>>>____


            &nb= sp;  <mailto:jmh.direct@joelhalpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>
            &nb= sp;            =            <mailto:jmh.direct@joelh= alpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>>

            &nb= sp;  <mailto:jmh.direct@joelhalpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>
            &nb= sp;            =            <mailto:jmh.direct@joelh= alpern.com
            &nb= sp;  <mailto:jmh.direct@joelhalpern.com>>>>> wrote:

            &nb= sp;            =             &nb= sp;           The -1= 3 will be out in
            &nb= sp;  a few days
            &nb= sp;            =            with all = the changes.
            &nb= sp;            =             &nb= sp;           That i= s what we will
            &nb= sp;  ask the WG to
            &nb= sp;            =            review.             &nb= sp;            =             &nb= sp;           If we = already had it
            &nb= sp;  out, we would
            &nb= sp;            =            have alre= ady asked for
            &nb= sp;            =             &nb= sp;      the WG to
            &nb= sp;            =             &nb= sp;           take a= last look.

            &nb= sp;            =             &nb= sp;           Yours,=
            &nb= sp;            =             &nb= sp;           Joel

            &nb= sp;            =             &nb= sp;           On 6/2= 9/17 7:21 PM,
            &nb= sp;  Greg Mirsky wrote:

            &nb= sp;            =             &nb= sp;            =    Hi Joel,
            &nb= sp;            =             &nb= sp;            =    is the -12 the
            &nb= sp;  latest published
            &nb= sp;            =            version o= f the NSH
            &nb= sp;            =             &nb= sp;      draft? As I
            &nb= sp;            =             &nb= sp;            =    see, it is missing
            &nb= sp;  TTL and all
            &nb= sp;            =            related c= hanges:





            &nb= sp;    _______________________________________________<= br class=3D"">             &nb= sp;            =             &nb= sp;      sfc mailing list
            &nb= sp;  sfc@ietf.org = <mailto:sfc@ietf.org> = <mailto:sfc@ietf.org
            &nb= sp;  <mailto:sfc@ie= tf.org>>
            &nb= sp;            =            <mailto:sfc@ietf.org
            &nb= sp;  <mailto:sfc@ie= tf.org> <mailto:sfc@ie= tf.org
            &nb= sp;  <mailto:sfc@ie= tf.org>>>
            &nb= sp;  https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>

            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>>

            &nb= sp;    <https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>

            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>>>

            &nb= sp;            =            ____



            &nb= sp;  _______________________________________________
            &nb= sp;            =        sfc mailing list
            &nb= sp;  sfc@ietf.org = <mailto:sfc@ietf.org> = <mailto:sfc@ietf.org
            &nb= sp;  <mailto:sfc@ie= tf.org>>
            &nb= sp;  https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>

            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>>____

            &nb= sp;            =    __ __

            &nb= sp;            =    _______________________________________________
            &nb= sp;            =    sfc mailing list
            &nb= sp;  sfc@ietf.org = <mailto:sfc@ietf.org> = <mailto:sfc@ietf.org
            &nb= sp;  <mailto:sfc@ie= tf.org>>
            &nb= sp;  https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>
            &nb= sp;            =    <https://www.ietf.org/mailman/listinfo/sfc
            &nb= sp;  <https://www.ietf.org/mailman/listinfo/sfc>>____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;           =97___= _

            &nb= sp;           Carlos= Pignataro, carlos@cisco.com
            &nb= sp;  <mailto:ca= rlos@cisco.com> <m= ailto:carlos@cisco.com
            &nb= sp;  <mailto:ca= rlos@cisco.com>>

            &nb= sp;           /=93So= metimes I use big words that I do not fully
            &nb= sp;  understand,
            &nb= sp;           to mak= e myself sound more photosynthesis."/____

            &nb= sp;           __ __<= br class=3D"">
            &nb= sp;       __ __



           =97
           Carlos Pi= gnataro, carlos@cisco.com <mailto:carlos@cisco.co= m>
           <mailto:carlos@cisco.com <<= a href=3D"mailto:carlos@cisco.com" class=3D"">mailto:carlos@cisco.com&g= t;>

           /=93Somet= imes I use big words that I do not fully understand,
           to make m= yself sound more photosynthesis."/


       =97
       Carlos Pignataro, carlos@cisco.com <mailto:carlos@cisco.com>
       <mailto:carlos@cisco.com <mailto:carlos@cisco.com>>

       /=93Sometimes I use big words tha= t I do not fully understand, to
       make myself sound more photosynth= esis."/




_______________________________________________
sfc mailing list
sfc@ietf.org
https://ww= w.ietf.org/mailman/listinfo/sfc


_______________________________________________
sfc mailing list
sfc@ietf.org
https://ww= w.ietf.org/mailman/listinfo/sfc

=97
Carlos Pignataro, carlo= s@cisco.com

=93Sometimes I use big words that I do not fully understand, = to make myself sound more photosynthesis."

--_000_2017070714513551446572155922090sandvinecom_-- From nobody Fri Jul 7 08:02:59 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71CA8127873 for ; Fri, 7 Jul 2017 08:02:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hqp9rneOsxru for ; Fri, 7 Jul 2017 08:02:49 -0700 (PDT) Received: from alln-iport-4.cisco.com (alln-iport-4.cisco.com [173.37.142.91]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2EAE0131610 for ; Fri, 7 Jul 2017 08:02:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=93802; q=dns/txt; s=iport; t=1499439769; x=1500649369; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=zm5EEo9aONSEFXr70IiVYuGOZtBZc5AgbK0SHQiKUm8=; b=KT/lnYEzPyR/Tz19wsjoYC7Ld7ZJOM21c1+eNiyR56zBcLgFtp5tCKX5 N+HyujDbuJDJo/ieuIdO5COy2cmSkeqmPxqY7/pwpMy5o+Jn+mo/zXNYy 5QW7pzKMvf6HVx+/aQA6sGhKevQXrezl2l2rbbnq+qJC4u3PbViAM6G9D o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AyAQAlol9Z/4QNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgy0tZIEUB4NphCWFdJFIIpYDghEhAQyCDgGDXwIagys/GAECAQE?= =?us-ascii?q?BAQEBAWsohRgBAQEBAwEBGAEIRAcLEAIBCA4DAQIBAiEBBgMCAgIlCxQDBggCB?= =?us-ascii?q?A4FCYlCZBCwAYImizIBAQEBAQEBAQEBAQEBAQEBAQEBAQEdgyiDTIFhKwuCboM?= =?us-ascii?q?mgRUSAQYtCR6CGD0wgjEFkE+OTgKHRoxCggxXhHSKSYwgiRkBHzh/C3UVHyoSA?= =?us-ascii?q?YcDdgGGbYEjgQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.40,323,1496102400"; d="scan'208,217";a="449581758" Received: from alln-core-10.cisco.com ([173.36.13.132]) by alln-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 07 Jul 2017 15:02:36 +0000 Received: from XCH-RTP-017.cisco.com (xch-rtp-017.cisco.com [64.101.220.157]) by alln-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id v67F2Z1K006866 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 7 Jul 2017 15:02:35 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Jul 2017 11:02:34 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Fri, 7 Jul 2017 11:02:34 -0400 From: "Carlos Pignataro (cpignata)" To: Med Boucadair CC: "Joel M. Halpern" , "sfc@ietf.org" Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt Thread-Index: AQHS9zIQ8HkorgkJMkK6NCg9C66wsg== Date: Fri, 7 Jul 2017 15:02:34 +0000 Message-ID: <9DD7C695-BCA5-4170-A641-14F5921702BD@cisco.com> References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.150.49.207] Content-Type: multipart/alternative; boundary="_000_9DD7C695BCA54170A64114F5921702BDciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: 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d="scan'208,217";a="451750349" Received: from rcdn-core-9.cisco.com ([173.37.93.145]) by alln-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jul 2017 15:04:13 +0000 Received: from XCH-RTP-018.cisco.com (xch-rtp-018.cisco.com [64.101.220.158]) by rcdn-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v67F4C85015951 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 7 Jul 2017 15:04:12 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-018.cisco.com (64.101.220.158) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Jul 2017 11:04:11 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Fri, 7 Jul 2017 11:04:11 -0400 From: "Carlos Pignataro (cpignata)" To: Dave Dolson CC: "Joel M. Halpern" , Greg Mirsky , "Andrew G. Malis" , "James N Guichard" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIAAZxA/gABHxoD//8Kyp4AARpEA Date: Fri, 7 Jul 2017 15:04:11 +0000 Message-ID: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <20170707141406.5144657.95230.22069@sandvine.com> <20170707145135.5144657.21559.22090@sandvine.com> In-Reply-To: <20170707145135.5144657.21559.22090@sandvine.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.150.49.207] Content-Type: multipart/alternative; boundary="_000_C69E556E1E334987932310621CB0B0CDciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 15:04:19 -0000 --_000_C69E556E1E334987932310621CB0B0CDciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksIERhdmUsDQoNCk9uIEp1bCA3LCAyMDE3LCBhdCAxMDo1MSBBTSwgRGF2ZSBEb2xzb24gPGRk b2xzb25Ac2FuZHZpbmUuY29tPG1haWx0bzpkZG9sc29uQHNhbmR2aW5lLmNvbT4+IHdyb3RlOg0K DQpNeSBwb2ludCBpcyB3ZSBjYW4gYXQgbGVhc3QgY2xlYXJseSBkZWZpbmUgdGhlIHJlcXVpcmVt 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Halpern" , "sfc@ietf.org" Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt Thread-Index: AQHS914ZlyVzVNQxbE+LAvWRmAeg1Q== Date: Fri, 7 Jul 2017 20:17:47 +0000 Message-ID: <92CB196B-91A9-4120-B76C-5DBA553E5698@cisco.com> References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.131] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiBzZmMgbWFp bGluZyBsaXN0DQo+IHNmY0BpZXRmLm9yZw0KPiBodHRwczovL3d3dy5pZXRmLm9yZy9tYWlsbWFu L2xpc3RpbmZvL3NmYw0KDQrigJQNCkNhcmxvcyBQaWduYXRhcm8sIGNhcmxvc0BjaXNjby5jb20N Cg0K4oCcU29tZXRpbWVzIEkgdXNlIGJpZyB3b3JkcyB0aGF0IEkgZG8gbm90IGZ1bGx5IHVuZGVy c3RhbmQsIHRvIG1ha2UgbXlzZWxmIHNvdW5kIG1vcmUgcGhvdG9zeW50aGVzaXMuIg0KDQo= From nobody Fri Jul 7 14:29:07 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 312E512ECB0 for ; Fri, 7 Jul 2017 14:29:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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10.202.59.212 with SMTP id i203mr1795868oia.104.1499462942707; Fri, 07 Jul 2017 14:29:02 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.16.102 with HTTP; Fri, 7 Jul 2017 14:28:42 -0700 (PDT) In-Reply-To: <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> From: "Andrew G. Malis" Date: Fri, 7 Jul 2017 17:28:42 -0400 Message-ID: To: "Joel M. Halpern" Cc: Greg Mirsky , "Carlos Pignataro (cpignata)" , "sfc@ietf.org" , Dave Dolson , James N Guichard Content-Type: multipart/alternative; boundary="001a113ccd8e0dda260553c0ec30" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 21:29:05 -0000 --001a113ccd8e0dda260553c0ec30 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Joel et al, The point of the bit is that it tells the NSH processing entity that it is > required to do extra work. The point of the bit is NOT to tell it what > extra work is required, or where to look for extra information. And by > keeping that separation, we get significant flexibility in how we address > various cases. And we can evaluate the behaviors we want for the differe= nt > situations, and set the bit appropriately for our desired behavior. > >> >> This was exactly the point of my proposed text change, to reflect that w= e don=E2=80=99t yet know where OAM information will occur. However, after cat= ching up on the discussion, my reaction is perhaps we can simply state that the definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit se= t, and leave it at that. Also, because the details of the forwarding and processing of OAM packets is outside the scope of this document, so should be the details of any optional parameters that modify that processing. So I now propose replacing the existing three OAM paragraphs with: O bit: Setting this bit indicates an Operations, Administration, and Maintenance (OAM) packet. The actual format and processing of SFC OAM packets is outside the scope of this specification (see [oam-frame ]). The O bit MUST be set for OAM packets and MUST NOT be set for non-OAM packets. The O bit MUST NOT be modified along the SFP. FInally, I want to reiterate that we need to decide bewteen =E2=80=9CO bit= =E2=80=9D and =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care which, but we should be consi= stent. I=E2=80=99m happy to leave that decision to the editors. Also, sorry for the delayed response, but I=E2=80=99ve been mostly offline = for the last few days. Cheers, Andy --001a113ccd8e0dda260553c0ec30 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Joel et al,

The point of the bit is that it tells the NSH processing entity that it is = required to do extra work.=C2=A0 The point of the bit is NOT to tell it wha= t extra work is required, or where to look for extra information. And by ke= eping that separation, we get significant flexibility in how we address var= ious cases.=C2=A0 And we can evaluate the behaviors we want for the differe= nt situations, and set the bit appropriately for our desired behavior.
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);pa= dding-left:1ex">
This was exactly the poi= nt of my proposed text change, to reflect that we don=E2=80=99t yet know wh= ere OAM information will occur. However, after catching up on the discussio= n, my reaction is perhaps we can simply state that the definition of an =E2= =80=9COAM packet=E2=80=9D is a packet with the O bit set, and leave it at t= hat.

Also, because the details of the forwarding a= nd processing of OAM packets is outside the scope of this document, so shou= ld be the details of any optional parameters that modify that processing.

So I now propose replacing the existing three OAM p= aragraphs with:

   O bit: Setting this bit indicates an Operations, Administrati=
on, and
   Maintenance (OAM) packet.  The actual format and processing of
   SFC OAM packets is outside the scope of this specification (see
   [oam-frame]). The O bit MUST be set for OAM packets and MUST NOT be=
=C2=A0
   set for non-OAM=
 packets. The O bit MUST NOT be modified along the SFP.
FInally, I want to reiterate that we need to decide bewteen =E2= =80=9CO bit=E2=80=9D and =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care whic= h, but we should be consistent. I=E2=80=99m happy to leave that decision to= the editors.

Also, sorry for the delayed response= , but I=E2=80=99ve been mostly offline for the last few days.
Cheers,
Andy


--001a113ccd8e0dda260553c0ec30-- From nobody Fri Jul 7 14:36:46 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9128131699 for ; Fri, 7 Jul 2017 14:36:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jwaoQUYwHdZF for ; Fri, 7 Jul 2017 14:36:42 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F31612EB8E for ; Fri, 7 Jul 2017 14:36:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=11792; q=dns/txt; s=iport; t=1499463402; x=1500673002; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=RuDqSfWB0RreQDmcd3HrFCH87edC3My2Jw8PMfRejoY=; b=ZMl3wLiyfpmLijBSeuARs3SfK9EEAY8lUhNknWER1RGOFc4FBnPPEjVa bDpTzJ//IibM7qxkemmIcdCB1DA31geTlYY+o/i60qGaVAv8nNhV6MaUb eEpTJcyktg++z3V7EB6KamXwBSNsocEJBZK185e1ggda1FY4ug3pGoZLQ E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DoAAC//V9Z/4kNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm9rZIEUB4NpihmaGIgphSyCESyFcAIagyw/GAECAQEBAQEBAWs?= =?us-ascii?q?ohRkGI1YQAgEIPwMCAgIfERQRAgQOBYlLTAMVELAJgiaHOA2EAAEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBARgFgyiDTIFhK4J5gleFJjCCMQWXNYctOwKHRodUhG6SIIt?= =?us-ascii?q?3iUIBHziBCnUVWwGHA3aIEYENAQEB?= X-IronPort-AV: E=Sophos; i="5.40,324,1496102400"; d="scan'208,217"; a="49247476" Received: from alln-core-4.cisco.com ([173.36.13.137]) by rcdn-iport-5.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 07 Jul 2017 21:36:41 +0000 Received: from XCH-RTP-019.cisco.com (xch-rtp-019.cisco.com [64.101.220.159]) by alln-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id v67Laf4m019093 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 7 Jul 2017 21:36:41 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-019.cisco.com (64.101.220.159) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Jul 2017 17:36:40 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Fri, 7 Jul 2017 17:36:40 -0400 From: "Carlos Pignataro (cpignata)" To: "Andrew G. Malis" CC: "Joel M. Halpern" , Greg Mirsky , "sfc@ietf.org" , Dave Dolson , James N Guichard Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIABI4kAgAACOYA= Date: Fri, 7 Jul 2017 21:36:40 +0000 Message-ID: <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: 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(amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WT5J23JDmPK1 for ; Fri, 7 Jul 2017 14:51:08 -0700 (PDT) Received: from mail-oi0-x22b.google.com (mail-oi0-x22b.google.com [IPv6:2607:f8b0:4003:c06::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 141921316E6 for ; Fri, 7 Jul 2017 14:51:08 -0700 (PDT) Received: by mail-oi0-x22b.google.com with SMTP id x187so38171716oig.3 for ; Fri, 07 Jul 2017 14:51:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=gmKzVcENgEhLGyb58ZGGAtmeLu2LEkIpXb393mpZt/A=; b=ZogrfB4wZQmTRziuGWVf2EyicPvVwZ3IdE719HY1+MKu5u9cIU9M21qIajHtOlt8Sp NsuCM0Rg+Tgf8wmIAwsXXZrpGay81Aqd8oHpM2RzsWvYOhrlZH0Ivs3FMoIBQI0ZI3Ed 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2017 14:51:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.16.102 with HTTP; Fri, 7 Jul 2017 14:50:46 -0700 (PDT) In-Reply-To: <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> From: "Andrew G. Malis" Date: Fri, 7 Jul 2017 17:50:46 -0400 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "Joel M. Halpern" , Greg Mirsky , "sfc@ietf.org" , Dave Dolson , James N Guichard Content-Type: multipart/alternative; boundary="001a1141c70c04b80f0553c13be5" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jul 2017 21:51:10 -0000 --001a1141c70c04b80f0553c13be5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Carlos, I would support that revision, and perhaps even make it stronger, into a MUST. But I could live with SHOULD. Cheers, Andy On Fri, Jul 7, 2017 at 5:36 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Thanks Andy for the follow-up! > > I do not oppose this proposal. I think it is useful and simplifies the > overall definition of the OAM bit. It might be useful to include =E2=80= =9Cunless > otherwise specified, implementations SHOULD discard packets with the O bi= t > set.=E2=80=9D (as this was important to the WG during earlier discussions= ) > > And yes, I suggest using =E2=80=9CO bit=E2=80=9D instead of =E2=80=9CO-bi= t=E2=80=9D. I will make this > change for now. > > Thanks! > > Carlos. > > On Jul 7, 2017, at 5:28 PM, Andrew G. Malis wrote: > > Joel et al, > > The point of the bit is that it tells the NSH processing entity that it i= s >> required to do extra work. The point of the bit is NOT to tell it what >> extra work is required, or where to look for extra information. And by >> keeping that separation, we get significant flexibility in how we addres= s >> various cases. And we can evaluate the behaviors we want for the differ= ent >> situations, and set the bit appropriately for our desired behavior. >> >>> >>> This was exactly the point of my proposed text change, to reflect that > we don=E2=80=99t yet know where OAM information will occur. However, afte= r catching > up on the discussion, my reaction is perhaps we can simply state that the > definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit = set, and leave it > at that. > > Also, because the details of the forwarding and processing of OAM packets > is outside the scope of this document, so should be the details of any > optional parameters that modify that processing. > > So I now propose replacing the existing three OAM paragraphs with: > > O bit: Setting this bit indicates an Operations, Administration, and > Maintenance (OAM) packet. The actual format and processing of > SFC OAM packets is outside the scope of this specification (see > [oam-frame ]). The O bit MUST be set for OAM packets and MUST NOT be > > set for non-OAM packets. The O bit MUST NOT be modified along the SFP. > > > FInally, I want to reiterate that we need to decide bewteen =E2=80=9CO bi= t=E2=80=9D and > =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care which, but we should be con= sistent. I=E2=80=99m happy to > leave that decision to the editors. > > Also, sorry for the delayed response, but I=E2=80=99ve been mostly offlin= e for the > last few days. > > Cheers, > Andy > > > > =E2=80=94 > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > --001a1141c70c04b80f0553c13be5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Carlos,

I would support that revision, = and perhaps even make it stronger, into a MUST. But I could live with SHOUL= D.

Cheers,
Andy


On Fri, Jul 7, = 2017 at 5:36 PM, Carlos Pignataro (cpignata) <cpignata@cisco.com>= wrote:
Thanks Andy for the follow-up!

I do not oppose this proposal. I think it is useful and simplifies the= overall definition of the OAM bit. It might be useful to include =E2=80=9C= unless otherwise specified, implementations SHOULD discard=C2=A0packets wit= h the O bit set.=E2=80=9D (as this was important to the WG during earlier discussions)

And yes, I suggest using =E2=80=9CO bit=E2=80=9D instead of =E2=80=9CO= -bit=E2=80=9D. I will make this change for now.

Thanks!

Carlos.

On Jul 7, 2017, at 5:28 PM, Andrew G. Malis <agmalis@gmail.com> wrote:

Joel et al,

The point of the bit is that it tells the NSH processing entity that it is = required to do extra work.=C2=A0 The point of the bit is NOT to tell it wha= t extra work is required, or where to look for extra information. And by ke= eping that separation, we get significant flexibility in how we address various cases.=C2=A0 And we can evaluate the= behaviors we want for the different situations, and set the bit appropriat= ely for our desired behavior.

This was exactly the point of my proposed text change, to reflect that= we don=E2=80=99t yet know where OAM information will occur. However, after= catching up on the discussion, my reaction is perhaps we can simply state = that the definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit set, and leave it at that.

Also, because the details of the forwarding and processing of OAM pack= ets is outside the scope of this document, so should be the details of any = optional parameters that modify that processing.

So I now propose replacing the existing three OAM paragraphs with: 

   O bit: Setting this bit=
 indicates an Operations, Administration, and
   Maintenance (OAM) packet.  The actual format and processing of
   SFC OAM packets is outside the scope of this specification (see
   [oam-frame]). The O bit MUST be set for OAM packe=
ts and MUST NOT be=C2=A0
   set for non-OAM packets=
. The O bit MUST NOT be modified along the SFP.

FInally, I want to reiterate that we need to decide bewteen =E2=80=9CO= bit=E2=80=9D and =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care which, but = we should be consistent. I=E2=80=99m happy to leave that decision to the ed= itors.

Also, sorry for the delayed response, but I=E2=80=99ve been mostly off= line for the last few days.

Cheers,
Andy



=E2=80=94
Carlos Pignataro,=C2=A0carlos@cisco.com

=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."


--001a1141c70c04b80f0553c13be5-- From nobody Mon Jul 10 00:58:41 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 697D813150C for ; Mon, 10 Jul 2017 00:58:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nhSwsADKBphP for ; Mon, 10 Jul 2017 00:58:22 -0700 (PDT) Received: from relais-inet.orange.com (mta136.mail.business.static.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 696A81275AB for ; Mon, 10 Jul 2017 00:58:22 -0700 (PDT) Received: from opfednr02.francetelecom.fr (unknown [xx.xx.xx.66]) by opfednr25.francetelecom.fr (ESMTP service) with ESMTP id 88DFD180236; Mon, 10 Jul 2017 09:58:20 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.34]) by opfednr02.francetelecom.fr (ESMTP service) with ESMTP id 34EDE120093; Mon, 10 Jul 2017 09:58:20 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM6F.corporate.adroot.infra.ftgroup ([fe80::bd00:88f8:8552:3349%17]) with mapi id 14.03.0352.000; Mon, 10 Jul 2017 09:58:19 +0200 From: To: "Andrew G. Malis" , "Carlos Pignataro (cpignata)" CC: Greg Mirsky , "Joel M. Halpern" , James N Guichard , "Dave Dolson" , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AQHS92gBp/d/PNDdRrqmXsjzABdYqaJIweUAgAAD8QCAA+6LkA== Date: Mon, 10 Jul 2017 07:58:19 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: multipart/alternative; boundary="_000_787AE7BB302AE849A7480A190F8B93300A002B87OPEXCLILMA3corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jul 2017 07:58:24 -0000 --_000_787AE7BB302AE849A7480A190F8B93300A002B87OPEXCLILMA3corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgQW5keSwgYWxsLA0KDQpUaGUgcmVhc29uIHdlIGhhZCDCqyBTSE9VTEQgwrsgaXMgYmVjYXVz ZSB3ZSBhbGxvdyBmb3IgYSBjb25maWd1cmFibGUgcGFyYW1ldGVyLg0KDQpGcm9tIHRoYXQgc3Rh bmRwb2ludCwgSSBkbyBwZXJzb25hbGx5IHByZWZlciB0aGlzIGNoYW5nZSB0aGF0IHRha2VzIGlu dG8gYWNjb3VudCB5b3VyIGNvbW1lbnQ6DQoNCk9MRDoNCg0KDQogICBPIGJpdDogU2V0dGluZyB0 aGlzIGJpdCBpbmRpY2F0ZXMgYW4gT3BlcmF0aW9ucywgQWRtaW5pc3RyYXRpb24sIGFuZA0KICAg 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Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.58]) by opfedar01.francetelecom.fr (ESMTP service) with ESMTP id 904C1160098; Mon, 10 Jul 2017 09:46:53 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM33.corporate.adroot.infra.ftgroup ([fe80::3881:fc15:b4b2:9017%19]) with mapi id 14.03.0352.000; Mon, 10 Jul 2017 09:46:53 +0200 From: To: "Carlos Pignataro (cpignata)" CC: "Joel M. Halpern" , "sfc@ietf.org" Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt Thread-Index: AQHS914Z8HkorgkJMkK6NCg9C66wsqJMnNgA Date: Mon, 10 Jul 2017 07:46:53 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A002B7D@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <149882241880.4694.1755169430753503252@ietfa.amsl.com> <0982ba88-4bc1-0993-f539-f4930e376948@joelhalpern.com> <787AE7BB302AE849A7480A190F8B93300A000DED@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <92CB196B-91A9-4120-B76C-5DBA553E5698@cisco.com> In-Reply-To: <92CB196B-91A9-4120-B76C-5DBA553E5698@cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-nsh-13.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: 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cy54aHRtbC4NCj4gPg0KPiANCj4gQmVmb3JlIG1ha2luZyB0aGlzIGNoYW5nZSwgbGV04oCZcyBm aWd1cmUgb3V0IGV4YWN0bHkgdGhlIGN1cnJlbnQgc3RhdHVzIGFuZA0KPiBmYXRlIG9mIHRoYXQg cmVnaXN0cmF0aW9uLg0KPiANCg0KW01lZF0gVGhpcyBvbmUgaXMgcGVuZGluZy4gIA0KDQo+ID4g PT0NCj4gPiBNaW5vcjoNCj4gPiA9PQ0KPiA+DQoNCltNZWRdIFRob3NlIGFyZSBtaW5vciBvbmVz LiBQaWNrIHRob3NlIHRoYXQgeW91IGFncmVlIHdpdGggYW5kIGlnbm9yZSB0aGUgcmVzdC4gVGhh bmsgeW91Lg0K From nobody Mon Jul 10 04:43:39 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EDB1F1316D3 for ; Mon, 10 Jul 2017 04:43:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham 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10.202.10.199 with SMTP id k68mr7253723oiy.115.1499687013494; Mon, 10 Jul 2017 04:43:33 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.232.34 with HTTP; Mon, 10 Jul 2017 04:43:12 -0700 (PDT) In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> From: "Andrew G. Malis" Date: Mon, 10 Jul 2017 07:43:12 -0400 Message-ID: To: "BOUCADAIR Mohamed IMT/OLN" Cc: "Carlos Pignataro (cpignata)" , Greg Mirsky , "Joel M. Halpern" , James N Guichard , Dave Dolson , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a113f1dccb6b4360553f51711" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jul 2017 11:43:38 -0000 --001a113f1dccb6b4360553f51711 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Med, The first two paragraphs look great, thanks. The third paragraph is inconsistent (this goes back to the original text as well). It starts out with: SF/SFF/SFC Proxy/Classifier implementations that do not support SFC OAM procedures SHOULD discard packets with O bit set, but then later says: Forwarding OAM packets unmodified by SFC elements that do not support SFC OAM procedures may be acceptable for a subset of OAM functions, but can result in unexpected outcomes for others, thus it is recommended to analyze the impact of forwarding an OAM packet for all OAM functions prior to enabling this behavior. The inconsistency is that forwarding OAM packets without supporting OAM procedures is clearly not recommended without analysis of the impact. However, since discarding is only a SHOULD for an implementation, not a MUST, the operator may not have a choice in the matter, since the vendor may not have implemented discarding at all. Thus, discarding should be a MUST in the absence of setting the configurable parameter. The configurable parameter would then allow the operator to modify the discarding behavior if they wish, following their analysis. Cheers, Andy On Mon, Jul 10, 2017 at 3:58 AM, wrote: > Hi Andy, all, > > > > The reason we had =C2=AB SHOULD =C2=BB is because we allow for a configur= able > parameter. > > > > From that standpoint, I do personally prefer this change that takes into > account your comment: > > > > OLD: > > > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual packet format and processing of > > SFC OAM messages is outside the scope of this specification (see > > [oam-frame > ]). > > > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > > OAM procedures SHOULD discard packets with O-bit set, but MAY support > > a configurable parameter to enable forwarding received SFC OAM > > packets unmodified to the next element in the chain. Forwarding OAM > > packets unmodified by SFC elements that do not support SFC OAM > > procedures may be acceptable for a subset of OAM functions, but can > > result in unexpected outcomes for others, thus it is recommended to > > analyze the impact of forwarding an OAM packet for all OAM functions > > prior to enabling this behavior. The configurable parameter MUST be > > disabled by default. > > > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > > packets. The O-bit MUST NOT be modified along the SFP. > > > > > > NEW: > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual format and processing of > > SFC OAM packets is outside the scope of this specification (see > > [oam-frame > ]). > > > > The O bit MUST be set for OAM packets and MUST NOT be set for non-OAM > > packets. The O bit MUST NOT be modified along the SFP. > > > > SF/SFF/SFC Proxy/Classifier implementations that do not support SFC > > OAM procedures SHOULD discard packets with O bit set, but MAY support > > a configurable parameter to enable forwarding received SFC OAM > > packets unmodified to the next element in the chain. Forwarding OAM > > packets unmodified by SFC elements that do not support SFC OAM > > procedures may be acceptable for a subset of OAM functions, but can > > result in unexpected outcomes for others, thus it is recommended to > > analyze the impact of forwarding an OAM packet for all OAM functions > > prior to enabling this behavior. The configurable parameter MUST be > > disabled by default. > > > > Cheers, > > Med > > > > *De :* sfc [mailto:sfc-bounces@ietf.org] *De la part de* Andrew G. Malis > *Envoy=C3=A9 :* vendredi 7 juillet 2017 23:51 > *=C3=80 :* Carlos Pignataro (cpignata) > *Cc :* Greg Mirsky; Joel M. Halpern; James N Guichard; Dave Dolson; > sfc@ietf.org > *Objet :* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 > in Prague] > > > > Carlos, > > > > I would support that revision, and perhaps even make it stronger, into a > MUST. But I could live with SHOULD. > > > > Cheers, > > Andy > > > > > > On Fri, Jul 7, 2017 at 5:36 PM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > > Thanks Andy for the follow-up! > > > > I do not oppose this proposal. I think it is useful and simplifies the > overall definition of the OAM bit. It might be useful to include =E2=80= =9Cunless > otherwise specified, implementations SHOULD discard packets with the O bi= t > set.=E2=80=9D (as this was important to the WG during earlier discussions= ) > > > > And yes, I suggest using =E2=80=9CO bit=E2=80=9D instead of =E2=80=9CO-bi= t=E2=80=9D. I will make this > change for now. > > > > Thanks! > > > > Carlos. > > > > On Jul 7, 2017, at 5:28 PM, Andrew G. Malis wrote: > > > > Joel et al, > > > > The point of the bit is that it tells the NSH processing entity that it i= s > required to do extra work. The point of the bit is NOT to tell it what > extra work is required, or where to look for extra information. And by > keeping that separation, we get significant flexibility in how we address > various cases. And we can evaluate the behaviors we want for the differe= nt > situations, and set the bit appropriately for our desired behavior. > > > > This was exactly the point of my proposed text change, to reflect that we > don=E2=80=99t yet know where OAM information will occur. However, after c= atching up > on the discussion, my reaction is perhaps we can simply state that the > definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit = set, and leave it > at that. > > > > Also, because the details of the forwarding and processing of OAM packets > is outside the scope of this document, so should be the details of any > optional parameters that modify that processing. > > > > So I now propose replacing the existing three OAM paragraphs with: > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual format and processing of > > SFC OAM packets is outside the scope of this specification (see > > [oam-frame ]). The O bit MUST be set for OAM packets and MUST NOT be > > set for non-OAM packets. The O bit MUST NOT be modified along the SFP. > > > > FInally, I want to reiterate that we need to decide bewteen =E2=80=9CO bi= t=E2=80=9D and > =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care which, but we should be con= sistent. I=E2=80=99m happy to > leave that decision to the editors. > > > > Also, sorry for the delayed response, but I=E2=80=99ve been mostly offlin= e for the > last few days. > > > > Cheers, > > Andy > > > > > > > > =E2=80=94 > > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > > > > --001a113f1dccb6b4360553f51711 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Med,

The first two paragraphs look grea= t, thanks.

The third paragraph is inconsistent (th= is goes back to the original text as well). It starts out with:
<= br>

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Cla= ssifier implementations that do not support SFC

=C2=A0=C2=A0 OAM procedur= es SHOULD discard packets with O bit set,

=

but then later says:

= =C2=A0 =C2=A0Forwarding OAM

=C2= =A0=C2=A0 packets unmodified by SFC elements that do not support SFC OAM=

=C2=A0=C2=A0 procedures may be acceptabl= e for a subset of OAM functions, but can

= =C2=A0=C2=A0 result in unexpected outcomes for others, thus it is reco= mmended to

=C2=A0=C2=A0 analyze the im= pact of forwarding an OAM packet for all OAM functions=

=C2=A0=C2=A0 prior = to enabling this behavior.

<= span lang=3D"EN-US" style=3D"font-size:10pt;font-family:'Courier New= 9;">
The inconsistency is that forwa= rding OAM packets without supporting OAM procedures is clearly not recommen= ded without analysis of the impact. However, since discarding is only a SHO= ULD for an implementation, not a MUST, the operator may not have a choice i= n the matter, since the vendor may not have implemented discarding at all.<= /div>

Thus, discarding should be a MUST in the abs= ence of setting the configurable parameter. The configurable parameter woul= d then allow the operator to modify the discarding behavior if they wish, f= ollowing their analysis.

Cheers,
Andy




On Mon, Jul 10, 2017 at 3:58 AM, <mohamed.boucadair@orange.com> wrote:

Hi Andy, all,

=C2=A0

The reason we had =C2=AB=C2=A0S= HOULD=C2=A0=C2=BB is because we allow for a configurable parameter.

=C2=A0

From that standpoint, I do pers= onally prefer this change that takes into account your comment: =C2=A0

=C2=A0

OLD:

=C2=A0

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indica= tes an Operations, Administration, and

=C2=A0=C2=A0 Maintenance (OAM) packe= t.=C2=A0 The actual packet format and processing of

=C2=A0=C2=A0 SFC OAM messages is outside th= e scope of this specification (see

=C2=A0=C2=A0 [oam-frame]).

=C2=A0

=C2=A0=C2=A0 SF/SFF/SFC Proxy/Classifer imp= lementations that do not support SFC

=C2=A0=C2=A0 OAM procedures SHOULD discard = packets with O-bit set, but MAY support

=C2=A0=C2=A0 a configurable parameter to en= able forwarding received SFC OAM

=C2=A0=C2=A0 packets unmodified to the next= element in the chain.=C2=A0 Forwarding OAM

=C2=A0=C2=A0 packets unmodified by SFC elem= ents that do not support SFC OAM

=C2=A0=C2=A0 procedures may be acceptable f= or a subset of OAM functions, but can

=C2=A0=C2=A0 result in unexpected outcomes = for others, thus it is recommended to

=C2=A0=C2=A0 analyze the impact of forwardi= ng an OAM packet for all OAM functions

=C2=A0=C2=A0 prior to enabling this behavio= r.=C2=A0 The configurable parameter MUST be

=C2=A0=C2=A0 disabled by default.=

=C2=A0

=C2=A0=C2=A0 The O-bit MUST be set f= or OAM packets and MUST NOT be set for non-OAM

=C2=A0=C2=A0 packets.=C2=A0 The O-bit MUST = NOT be modified along the SFP.

=C2=A0

=C2=A0

NEW:

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indica= tes an Operations, Administration, and

=C2=A0=C2=A0 Maintenance (OAM) packet.=C2= =A0 The actual format and processing of

=C2=A0=C2=A0 SFC OAM packets is outside the= scope of this specification (see

=C2=A0=C2=A0 [oam-frame]).

=C2=A0

=C2=A0=C2=A0 The O bit MUST be set for OAM = packets and MUST NOT be set for non-OAM

=C2=A0=C2=A0 packets.=C2=A0 The O bit MUST = NOT be modified along the SFP.

=C2=A0

=C2=A0=C2=A0 SF/SFF/SFC Proxy/Classi= fier implementations that do not support SFC

=C2=A0=C2=A0 OAM procedures SHOULD discard = packets with O bit set, but MAY support

=C2=A0=C2=A0 a configurable paramete= r to enable forwarding received SFC OAM

=C2=A0=C2=A0 packets unmodified to the next= element in the chain.=C2=A0 Forwarding OAM

=C2=A0=C2=A0 packets unmodified by SFC elem= ents that do not support SFC OAM

=C2=A0=C2=A0 procedures may be acceptable f= or a subset of OAM functions, but can

=C2=A0=C2=A0 result in unexpected outcomes = for others, thus it is recommended to

=C2=A0=C2=A0 analyze the impact of forwardi= ng an OAM packet for all OAM functions

=C2=A0=C2=A0 prior to enabling this behavio= r.=C2=A0 The configurable parameter MUST be

=C2=A0=C2=A0 disabled by default.=

=C2=A0

Cheers,

Med

=C2=A0

De=C2=A0: sfc = [mailto:sfc-bounc= es@ietf.org] De la part de Andrew G. Malis
Envoy=C3=A9=C2=A0: vendredi 7 juillet 2017 23:51
=C3=80=C2=A0: Carlos Pignataro (cpignata)
Cc=C2=A0: Greg Mirsky; Joel M. Halpern; James N Guichard; Dave Dolso= n; sfc@ietf.org
Objet=C2=A0: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at= IETF 99 in Prague]

=C2=A0

Carlos,

=C2=A0

I would support that revision, and perhaps even make= it stronger, into a MUST. But I could live with SHOULD.

=C2=A0

Cheers,

Andy

=C2=A0

=C2=A0

On Fri, Jul 7, 2017 at 5:36 PM, Carlos Pignataro (cp= ignata) <cpignat= a@cisco.com> wrote:

Thanks Andy for the follow-up!

=C2=A0

I do not oppose this proposal. I think it is useful = and simplifies the overall definition of the OAM bit. It might be useful to= include =E2=80=9Cunless otherwise specified, implementations SHOULD discar= d=C2=A0packets with the O bit set.=E2=80=9D (as this was important to the WG during earlier discussions)

=C2=A0

And yes, I suggest using =E2=80=9CO bit=E2=80=9D ins= tead of =E2=80=9CO-bit=E2=80=9D. I will make this change for now.=

=C2=A0

Thanks!

=C2=A0

Carlos.

=C2=A0

On Jul 7, 2017, at 5:28 PM, Andrew G. Malis <agmalis@gmail.com>= ; wrote:

=C2=A0

Joel et al,

=C2=A0

The point of the bit is that it tells the NSH proces= sing entity that it is required to do extra work.=C2=A0 The point of the bi= t is NOT to tell it what extra work is required, or where to look for extra= information. And by keeping that separation, we get significant flexibility in how we address various cases.=C2=A0 And = we can evaluate the behaviors we want for the different situations, and set= the bit appropriately for our desired behavior.

=C2=A0

This was exactly the point of my proposed text chang= e, to reflect that we don=E2=80=99t yet know where OAM information will occ= ur. However, after catching up on the discussion, my reaction is perhaps we= can simply state that the definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit set, and leave it = at that.

=C2=A0

Also, because the details of the forwarding and proc= essing of OAM packets is outside the scope of this document, so should be t= he details of any optional parameters that modify that processing.

=C2=A0

So I now propose replacing the existing three OAM pa= ragraphs with:

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indicates an Operations, Administ=
ration, and
=C2=A0=C2=A0 Maintenance (OAM) packet.=C2=A0 The actual format and pro=
cessing of
=C2=A0=C2=A0 SFC OAM packets is outside the scope of this specificatio=
n (see
=C2=A0=C2=A0 [oam-frame]). The O bit MUST be se=
t for OAM packets and MUST NOT be=C2=A0
=C2=A0=C2=A0 set for non-OAM packets. The O bit MUST NOT be modified a=
long the SFP.

=C2=A0

FInally, I want to reiterate that we need to decide = bewteen =E2=80=9CO bit=E2=80=9D and =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99= t care which, but we should be consistent. I=E2=80=99m happy to leave that = decision to the editors.

=C2=A0

Also, sorry for the delayed response, but I=E2=80=99= ve been mostly offline for the last few days.

=C2=A0

Cheers,

Andy

=C2=A0

=C2=A0

=C2=A0

=E2=80=94<= /span>

Carlos Pignataro,=C2=A0<= a href=3D"mailto:carlos@cisco.com" target=3D"_blank">carlos@cisco.com
=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."

=C2=A0

=C2=A0


--001a113f1dccb6b4360553f51711-- From nobody Mon Jul 10 05:08:12 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 552A61316F6 for ; Mon, 10 Jul 2017 05:08:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wmwYBjW5O55J for ; Mon, 10 Jul 2017 05:08:09 -0700 (PDT) Received: from relais-inet.orange.com (mta239.mail.business.static.orange.com [80.12.66.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F19F0131703 for ; Mon, 10 Jul 2017 05:08:05 -0700 (PDT) Received: from opfedar02.francetelecom.fr (unknown [xx.xx.xx.4]) by opfedar20.francetelecom.fr (ESMTP service) with ESMTP id AA7441209E3; Mon, 10 Jul 2017 14:08:04 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.17]) by opfedar02.francetelecom.fr (ESMTP service) with ESMTP id 66C1B18009F; Mon, 10 Jul 2017 14:08:04 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM24.corporate.adroot.infra.ftgroup ([fe80::a1e6:3e6a:1f68:5f7e%18]) with mapi id 14.03.0352.000; Mon, 10 Jul 2017 14:08:04 +0200 From: To: "Andrew G. Malis" CC: "Carlos Pignataro (cpignata)" , Greg Mirsky , "Joel M. Halpern" , "James N Guichard" , Dave Dolson , "sfc@ietf.org" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AQHS+XHEpIaVimlY8Umrzv1ZIxNY9qJM89nQ Date: Mon, 10 Jul 2017 12:08:03 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A002D7D@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: 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<20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <787AE7BB302AE849A7480A190F8B93300A002D7D@OPEXCLILMA3.corporate.adroot.infra.ftgroup> From: "Andrew G. Malis" Date: Mon, 10 Jul 2017 08:58:05 -0400 Message-ID: To: "BOUCADAIR Mohamed IMT/OLN" Cc: "Carlos Pignataro (cpignata)" , "sfc@ietf.org" , Greg Mirsky , James N Guichard , "Joel M. Halpern" , Dave Dolson Content-Type: multipart/alternative; boundary="001a113ccd8e87369f0553f6232a" Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jul 2017 12:58:34 -0000 --001a113ccd8e87369f0553f6232a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Med, Sigh, I see Adrian=E2=80=99s point as well. Thanks for reminding me of his = email. :-) So I=E2=80=99m OK with your revision. Cheers, Andy On Mon, Jul 10, 2017 at 8:08 AM, wrote: > Andy, > > > > Please see inline. > > > > Cheers, > > Med > > > > *De :* Andrew G. Malis [mailto:agmalis@gmail.com] > *Envoy=C3=A9 :* lundi 10 juillet 2017 13:43 > *=C3=80 :* BOUCADAIR Mohamed IMT/OLN > *Cc :* Carlos Pignataro (cpignata); Greg Mirsky; Joel M. Halpern; James N > Guichard; Dave Dolson; sfc@ietf.org > *Objet :* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 > in Prague] > > > > Med, > > > > The first two paragraphs look great, thanks. > > > > The third paragraph is inconsistent (this goes back to the original text > as well). > > > > It starts out with: > > > > SF/SFF/SFC Proxy/Classifier implementations that do not support SFC > > OAM procedures SHOULD discard packets with O bit set, > > but then later says: > > > > Forwarding OAM > > packets unmodified by SFC elements that do not support SFC OAM > > procedures may be acceptable for a subset of OAM functions, but can > > result in unexpected outcomes for others, thus it is recommended to > > analyze the impact of forwarding an OAM packet for all OAM functions > > prior to enabling this behavior. > > > > The inconsistency is that forwarding OAM packets without supporting OAM > procedures is clearly not recommended without analysis of the impact. > > [Med] The rationale was to disable forwarding such packets by default=E2= =80=A6but > if under some deployments and after local assessment, that default behavi= or > can be changed. We included in that text sufficient warrants. > > > > However, since discarding is only a SHOULD for an implementation, not a > MUST, the operator may not have a choice in the matter, since the vendor > may not have implemented discarding at all. > > [Med] We used to have this wording in an earlier version of the NSH > specification (-10) : > > > > SF/SFF/SFC Proxy/Classifer implementations, which do not support SFC > > OAM procedures, SHALL discard packets with O-bit set. > > > > We agreed to change SHALL to SHOULD as per this discussion: > https://www.ietf.org/mail-archive/web/sfc/current/msg05624.html. I don=E2= =80=99t > think we need to (re)play that discussion. > > > > Thus, discarding should be a MUST in the absence of setting the > configurable parameter. The configurable parameter would then allow the > operator to modify the discarding behavior if they wish, following their > analysis. > > [Med] I hear you. This was my opinion too, but I changed my opinion on > this based on the comment from Adrian. > > > > Cheers, > > Andy > > > > > > > > > > On Mon, Jul 10, 2017 at 3:58 AM, wrote: > > Hi Andy, all, > > > > The reason we had =C2=AB SHOULD =C2=BB is because we allow for a configur= able > parameter. > > > > From that standpoint, I do personally prefer this change that takes into > account your comment: > > > > OLD: > > > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual packet format and processing of > > SFC OAM messages is outside the scope of this specification (see > > [oam-frame > ]). > > > > SF/SFF/SFC Proxy/Classifer implementations that do not support SFC > > OAM procedures SHOULD discard packets with O-bit set, but MAY support > > a configurable parameter to enable forwarding received SFC OAM > > packets unmodified to the next element in the chain. Forwarding OAM > > packets unmodified by SFC elements that do not support SFC OAM > > procedures may be acceptable for a subset of OAM functions, but can > > result in unexpected outcomes for others, thus it is recommended to > > analyze the impact of forwarding an OAM packet for all OAM functions > > prior to enabling this behavior. The configurable parameter MUST be > > disabled by default. > > > > The O-bit MUST be set for OAM packets and MUST NOT be set for non-OAM > > packets. The O-bit MUST NOT be modified along the SFP. > > > > > > NEW: > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual format and processing of > > SFC OAM packets is outside the scope of this specification (see > > [oam-frame > ]). > > > > The O bit MUST be set for OAM packets and MUST NOT be set for non-OAM > > packets. The O bit MUST NOT be modified along the SFP. > > > > SF/SFF/SFC Proxy/Classifier implementations that do not support SFC > > OAM procedures SHOULD discard packets with O bit set, but MAY support > > a configurable parameter to enable forwarding received SFC OAM > > packets unmodified to the next element in the chain. Forwarding OAM > > packets unmodified by SFC elements that do not support SFC OAM > > procedures may be acceptable for a subset of OAM functions, but can > > result in unexpected outcomes for others, thus it is recommended to > > analyze the impact of forwarding an OAM packet for all OAM functions > > prior to enabling this behavior. The configurable parameter MUST be > > disabled by default. > > > > Cheers, > > Med > > > > *De :* sfc [mailto:sfc-bounces@ietf.org] *De la part de* Andrew G. Malis > *Envoy=C3=A9 :* vendredi 7 juillet 2017 23:51 > *=C3=80 :* Carlos Pignataro (cpignata) > *Cc :* Greg Mirsky; Joel M. Halpern; James N Guichard; Dave Dolson; > sfc@ietf.org > *Objet :* Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 > in Prague] > > > > Carlos, > > > > I would support that revision, and perhaps even make it stronger, into a > MUST. But I could live with SHOULD. > > > > Cheers, > > Andy > > > > > > On Fri, Jul 7, 2017 at 5:36 PM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > > Thanks Andy for the follow-up! > > > > I do not oppose this proposal. I think it is useful and simplifies the > overall definition of the OAM bit. It might be useful to include =E2=80= =9Cunless > otherwise specified, implementations SHOULD discard packets with the O bi= t > set.=E2=80=9D (as this was important to the WG during earlier discussions= ) > > > > And yes, I suggest using =E2=80=9CO bit=E2=80=9D instead of =E2=80=9CO-bi= t=E2=80=9D. I will make this > change for now. > > > > Thanks! > > > > Carlos. > > > > On Jul 7, 2017, at 5:28 PM, Andrew G. Malis wrote: > > > > Joel et al, > > > > The point of the bit is that it tells the NSH processing entity that it i= s > required to do extra work. The point of the bit is NOT to tell it what > extra work is required, or where to look for extra information. And by > keeping that separation, we get significant flexibility in how we address > various cases. And we can evaluate the behaviors we want for the differe= nt > situations, and set the bit appropriately for our desired behavior. > > > > This was exactly the point of my proposed text change, to reflect that we > don=E2=80=99t yet know where OAM information will occur. However, after c= atching up > on the discussion, my reaction is perhaps we can simply state that the > definition of an =E2=80=9COAM packet=E2=80=9D is a packet with the O bit = set, and leave it > at that. > > > > Also, because the details of the forwarding and processing of OAM packets > is outside the scope of this document, so should be the details of any > optional parameters that modify that processing. > > > > So I now propose replacing the existing three OAM paragraphs with: > > > > O bit: Setting this bit indicates an Operations, Administration, and > > Maintenance (OAM) packet. The actual format and processing of > > SFC OAM packets is outside the scope of this specification (see > > [oam-frame ]). The O bit MUST be set for OAM packets and MUST NOT be > > set for non-OAM packets. The O bit MUST NOT be modified along the SFP. > > > > FInally, I want to reiterate that we need to decide bewteen =E2=80=9CO bi= t=E2=80=9D and > =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99t care which, but we should be con= sistent. I=E2=80=99m happy to > leave that decision to the editors. > > > > Also, sorry for the delayed response, but I=E2=80=99ve been mostly offlin= e for the > last few days. > > > > Cheers, > > Andy > > > > > > > > =E2=80=94 > > Carlos Pignataro, carlos@cisco.com > > *=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself > sound more photosynthesis."* > > > > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > --001a113ccd8e87369f0553f6232a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Med,

Sigh, I see Adrian=E2=80=99s point= as well. Thanks for reminding me of his email. :-)

So I=E2=80=99m OK with your revision.

Cheers,
Andy


On Mon, Jul 10, 2017 at 8:08 AM, &= lt;mohame= d.boucadair@orange.com> wrote:

Andy,

=C2=A0

Please see inline.

=C2=A0

Cheers,

Med

=C2=A0

De=C2=A0: Andr= ew G. Malis [mailto:= agmalis@gmail.com]
Envoy=C3=A9=C2=A0: lundi 10 juillet 2017 13:43
=C3=80=C2=A0: BOUCADAIR Mohamed IMT/OLN
Cc=C2=A0: Carlos Pignataro (cpignata); Greg Mirsky; Joel M. Halpern;= James N Guichard; Dave Dolson; sfc@ietf.org
Objet=C2=A0: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at= IETF 99 in Prague]

=C2=A0

Med,

=C2=A0

The first two paragraphs look great, thanks.<= u>

=C2=A0

The third paragraph is inconsistent (this goes back = to the original text as well).

=C2=A0

It starts out with:

=C2=A0

=C2=A0 =C2=A0SF/SFF/SFC Proxy/Classifier im= plementations that do not support SFC=

=C2=A0=C2=A0 OAM procedures SHOULD discard = packets with O bit set,

but then later says:

=C2=A0

=C2=A0 =C2=A0Forwarding OAM

=C2=A0=C2=A0 packets unmodifi= ed by SFC elements that do not support SFC OAM

=C2=A0=C2=A0 procedures may b= e acceptable for a subset of OAM functions, but can

=C2=A0=C2=A0 result in unexpe= cted outcomes for others, thus it is recommended to

=C2=A0=C2=A0 analyze the impa= ct of forwarding an OAM packet for all OAM functions

=C2=A0=C2=A0 prior to enablin= g this behavior.

=C2=A0

The inconsistency is that forwarding OAM packets wit= hout supporting OAM procedures is clearly not recommended without analysis = of the impact.

[Med] The rationale was = to disable forwarding such packets by default=E2=80=A6but if under some dep= loyments and after local assessment, that default behavior can be changed. We included in that text sufficient warrants. =C2=A0=

=C2=A0

However, since discarding is on= ly a SHOULD for an implementation, not a MUST, the operator may not have a = choice in the matter, since the vendor may not have implemented discarding = at all.

[Med] We used to have th= is wording in an earlier version of the NSH specification (-10) :

=C2=A0

=C2=A0=C2=A0 SF/SFF/SFC Proxy/Classifer imp= lementations, which do not support SFC

=C2=A0=C2=A0 OAM procedures, SHALL discard = packets with O-bit set.

=C2=A0

We agreed to change SHALL to SH= OULD as per this discussion: https://www.ietf.org/mail-archive/web/sfc/current/<= wbr>msg05624.html. I don=E2=80=99t think we need to (re)play that discu= ssion. =C2=A0=C2=A0

=C2=A0

Thus, discarding should be a MU= ST in the absence of setting the configurable parameter. The configurable p= arameter would then allow the operator to modify the discarding behavior if= they wish, following their analysis.

[Med] I hear you. This w= as my opinion too, but I changed my opinion on this based on the comment fr= om Adrian.

=C2=A0

Cheers,

Andy

=C2=A0

=C2=A0

=C2=A0

=C2=A0

On Mon, Jul 10, 2017 at 3:58 AM, <mohamed.boucadair@orange= .com> wrote:

Hi Andy, all,

=C2=A0

The reason we had =C2=AB=C2=A0S= HOULD=C2=A0=C2=BB is because we allow for a configurable parameter.

=C2=A0

From that standpoint, I do pers= onally prefer this change that takes into account your comment: =C2=A0

=C2=A0

OLD:

=C2=A0

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indica= tes an Operations, Administration, and

=C2=A0=C2=A0 Maintenance (OAM) packet.=C2= =A0 The actual packet format and processing of

=C2=A0=C2=A0 SFC OAM messages is outside th= e scope of this specification (see

=C2=A0=C2=A0 [oam-frame]).

=C2=A0

=C2=A0=C2=A0 SF/SFF/SFC Proxy/Classifer imp= lementations that do not support SFC

=C2=A0=C2=A0 OAM procedures SHOULD discard = packets with O-bit set, but MAY support

=C2=A0=C2=A0 a configurable parameter to en= able forwarding received SFC OAM

=C2=A0=C2=A0 packets unmodified to the next= element in the chain.=C2=A0 Forwarding OAM

=C2=A0=C2=A0 packets unmodified by SFC elem= ents that do not support SFC OAM

=C2=A0=C2=A0 procedures may be acceptable f= or a subset of OAM functions, but can

=C2=A0=C2=A0 result in unexpected outcomes = for others, thus it is recommended to

=C2=A0=C2=A0 analyze the impact of forwardi= ng an OAM packet for all OAM functions

=C2=A0=C2=A0 prior to enabling this behavio= r.=C2=A0 The configurable parameter MUST be

=C2=A0=C2=A0 disabled by default.=

=C2=A0

=C2=A0=C2=A0 The O-bit MUST be set for OAM = packets and MUST NOT be set for non-OAM

=C2=A0=C2=A0 packets.=C2=A0 The O-bit MUST = NOT be modified along the SFP.

=C2=A0

=C2=A0

NEW:

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indica= tes an Operations, Administration, and

=C2=A0=C2=A0 Maintenance (OAM) packet.=C2= =A0 The actual format and processing of

=C2=A0=C2=A0 SFC OAM packets is outside the= scope of this specification (see

=C2=A0=C2=A0 [oam-frame]).

=C2=A0

=C2=A0=C2=A0 The O bit MUST be set for OAM = packets and MUST NOT be set for non-OAM

=C2=A0=C2=A0 packets.=C2=A0 The O bit MUST = NOT be modified along the SFP.

=C2=A0

=C2=A0=C2=A0 SF/SFF/SFC Proxy/Classifier im= plementations that do not support SFC

=C2=A0=C2=A0 OAM procedures SHOULD discard = packets with O bit set, but MAY support

=C2=A0=C2=A0 a configurable parameter to en= able forwarding received SFC OAM

=C2=A0=C2=A0 packets unmodified to the next= element in the chain.=C2=A0 Forwarding OAM

=C2=A0=C2=A0 packets unmodified by SFC elem= ents that do not support SFC OAM

=C2=A0=C2=A0 procedures may be acceptable f= or a subset of OAM functions, but can

=C2=A0=C2=A0 result in unexpected outcomes = for others, thus it is recommended to

=C2=A0=C2=A0 analyze the impact of forwardi= ng an OAM packet for all OAM functions

=C2=A0=C2=A0 prior to enabling this behavio= r.=C2=A0 The configurable parameter MUST be

=C2=A0=C2=A0 disabled by default.=

=C2=A0

Cheers,

Med

=C2=A0

De=C2=A0: sfc = [mailto:sfc-bounc= es@ietf.org] De la part de Andrew G. Malis
Envoy=C3=A9=C2=A0: vendredi 7 juillet 2017 23:51
=C3=80=C2=A0: Carlos Pignataro (cpignata)
Cc=C2=A0: Greg Mirsky; Joel M. Halpern; James N Guichard; Dave Dolso= n; sfc@ietf.org
Objet=C2=A0: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at= IETF 99 in Prague]

=C2=A0

Carlos,

=C2=A0

I would support that revision, and perhaps even make= it stronger, into a MUST. But I could live with SHOULD.

=C2=A0

Cheers,

Andy

=C2=A0

=C2=A0

On Fri, Jul 7, 2017 at 5:36 PM, Carlos Pignataro (cp= ignata) <cpignat= a@cisco.com> wrote:

Thanks Andy for the follow-up!

=C2=A0

I do not oppose this proposal. I think it is useful = and simplifies the overall definition of the OAM bit. It might be useful to= include =E2=80=9Cunless otherwise specified, implementations SHOULD discard=C2=A0packets with the O bit set.=E2=80=9D (as this was impo= rtant to the WG during earlier discussions)

=C2=A0

And yes, I suggest using =E2=80=9CO bit=E2=80=9D ins= tead of =E2=80=9CO-bit=E2=80=9D. I will make this change for now.=

=C2=A0

Thanks!

=C2=A0

Carlos.

=C2=A0

On Jul 7, 2017, at 5:28 PM, Andrew G. Malis <agmalis@gmail.com>= ; wrote:

=C2=A0

Joel et al,

=C2=A0

The point of the bit is that it tells the NSH proces= sing entity that it is required to do extra work.=C2=A0 The point of the bi= t is NOT to tell it what extra work is required, or where to look for extra information. And by keeping that separation, we get sign= ificant flexibility in how we address various cases.=C2=A0 And we can evalu= ate the behaviors we want for the different situations, and set the bit app= ropriately for our desired behavior.

=C2=A0

This was exactly the point of my proposed text chang= e, to reflect that we don=E2=80=99t yet know where OAM information will occ= ur. However, after catching up on the discussion, my reaction is perhaps we can simply state that the definition of an =E2=80=9COAM pack= et=E2=80=9D is a packet with the O bit set, and leave it at that.=

=C2=A0

Also, because the details of the forwarding and proc= essing of OAM packets is outside the scope of this document, so should be t= he details of any optional parameters that modify that processing.

=C2=A0

So I now propose replacing the existing three OAM pa= ragraphs with:

=C2=A0

=C2=A0=C2=A0 O bit: Setting this bit indicates an Operations, Administ=
ration, and
=C2=A0=C2=A0 Maintenance (OAM) packet.=C2=A0 The actual format and pro=
cessing of
=C2=A0=C2=A0 SFC OAM packets is outside the scope of this specificatio=
n (see
=C2=A0=C2=A0 [oam-frame]). The O bit MUST be se=
t for OAM packets and MUST NOT be=C2=A0
=C2=A0=C2=A0 set for non-OAM packets. The O bit MUST NOT be modified a=
long the SFP.

=C2=A0

FInally, I want to reiterate that we need to decide = bewteen =E2=80=9CO bit=E2=80=9D and =E2=80=9CO-bit=E2=80=9D. I don=E2=80=99= t care which, but we should be consistent. I=E2=80=99m happy to leave that = decision to the editors.

=C2=A0

Also, sorry for the delayed response, but I=E2=80=99= ve been mostly offline for the last few days.

=C2=A0

Cheers,

Andy

=C2=A0

=C2=A0

=C2=A0

=E2=80=94<= u>

Carlos Pignataro,=C2=A0<= a href=3D"mailto:carlos@cisco.com" target=3D"_blank">carlos@cisco.com
=E2=80=9CSometimes I use big words that I do not fully understand, to ma= ke myself sound more=C2=A0photosynthesis."

=C2=A0

=C2=A0

=C2=A0


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--001a113ccd8e87369f0553f6232a-- From nobody Mon Jul 10 08:34:46 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2736127B73 for ; Mon, 10 Jul 2017 08:34:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Uwq1IW5P-rXt for ; Mon, 10 Jul 2017 08:34:42 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 149B1127868 for ; Mon, 10 Jul 2017 08:34:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=64990; q=dns/txt; s=iport; t=1499700881; x=1500910481; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=zzLZY2we8j48b18pXJMjBXjNFkzZoY6R0UeQU84zBAg=; b=hNPm01KaKZRK/l7VJVqre93uJLRUUt43vE3uzgjEaeRgLMx/iikAkxs5 P/eoaXckI/uIIXjyu6BKLG9IBodcnJcCq2lE+nHJzT2ZI52NBd/2oDFAN fEUYZAVfkS0iyggQKNzngs9l7jldwdBzRuvBU78wb8UszmQiF1ZssarCw M=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DUAAAanmNZ/5tdJa1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm9rZIEUB4NpihmRaogvjVWCDgMhAQqFcAIagwo/GAECAQEBAQE?= =?us-ascii?q?BAWsohRkCAQMBASFLCxACAQgtCwEGAwICAh8GCxQRAgQOBYlLTAMVEKsNgiaHN?= =?us-ascii?q?A2EAAEBAQEBAQEBAQEBAQEBAQEBAQEBARgFgyiDTIFhK4J5gleBZBECAVEJglQ?= =?us-ascii?q?wgjEFlzWHLjsCh0aHVIRuggyFS4pLi3mJRgEfOH8LdRVJEgGER4I8dgGHWIENA?= =?us-ascii?q?QEB?= X-IronPort-AV: E=Sophos;i="5.40,341,1496102400"; d="scan'208,217";a="257779304" Received: from rcdn-core-4.cisco.com ([173.37.93.155]) by rcdn-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Jul 2017 15:34:40 +0000 Received: from XCH-RTP-018.cisco.com (xch-rtp-018.cisco.com [64.101.220.158]) by rcdn-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id v6AFYeU0028364 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 10 Jul 2017 15:34:40 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-018.cisco.com (64.101.220.158) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 10 Jul 2017 11:34:39 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Mon, 10 Jul 2017 11:34:39 -0400 From: "Carlos Pignataro (cpignata)" To: "Andrew G. Malis" CC: Med Boucadair , "sfc@ietf.org" , Greg Mirsky , James N Guichard , "Joel M. Halpern" , "Dave Dolson" Thread-Topic: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] Thread-Index: AdLxKr9Op/d/PNDdRrqmXsjzABdYqQAInY4AAACtAIAAAAstAABczdEAAAF39YAAAWzuAAAAUc+AAACI8QAAaz5YgAAKm0uAAEdfzYAASAWoAAACVpSA//++llaAAERAAIAABtmAgAAC4ACAAAGzgIABI4kAgAACOYCAAAPxAIADzmmAgAA+1QCAAAbygIAADfqAgAAruwA= Date: Mon, 10 Jul 2017 15:34:39 +0000 Message-ID: References: <154501d2f12a$c3516ea0$49f44be0$@olddog.co.uk> <10f44d37-abab-81c5-994c-057816361d8b@joelhalpern.com> <6dc6ac23-a572-eef3-7f81-987ce7f5d65d@joelhalpern.com> <33CEB96C-04F1-4FEB-8B18-D257DF1531C8@cisco.com> <20170707032005.5144657.26796.21967@sandvine.com> <039DA7F2-3FEC-4C8E-A5C3-FFEE8EFF3587@cisco.com> <5850a958-1720-4ce1-a840-0af018bd6fca@joelhalpern.com> <2ea3d07d-fae0-765a-8bbd-bae854c0b682@joelhalpern.com> <58ECBF12-77E2-4D36-80FD-02F651798886@cisco.com> <787AE7BB302AE849A7480A190F8B93300A002B87@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <787AE7BB302AE849A7480A190F8B93300A002D7D@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.132] Content-Type: multipart/alternative; boundary="_000_F7C19808E02D436BB6D3D41A04BE10FDciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Status of draft-ietf-sfc-nsh [Was: Meeting at IETF 99 in Prague] X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jul 2017 15:34:45 -0000 --_000_F7C19808E02D436BB6D3D41A04BE10FDciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 VGhpcyBpcyBhbHNvIGFjY2VwdGFibGUgdG8gbWUsIGFuZCBJIGJlbGlldmUgY2xvc2VzIHRoZSBs 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ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Jul 2017 17:58:22 +0000 Received: from XCH-RTP-009.cisco.com (xch-rtp-009.cisco.com [64.101.220.149]) by rcdn-core-12.cisco.com (8.14.5/8.14.5) with ESMTP id v6EHwLga015221 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Fri, 14 Jul 2017 17:58:22 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-009.cisco.com (64.101.220.149) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 14 Jul 2017 13:58:21 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Fri, 14 Jul 2017 13:58:21 -0400 From: "Kent Leung (kleung)" To: "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2Q== Date: Fri, 14 Jul 2017 17:58:21 +0000 Message-ID: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.63.127] Content-Type: multipart/alternative; boundary="_000_91d8a4564df24299a24bee2688c9f6a6XCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 17:58:25 -0000 --_000_91d8a4564df24299a24bee2688c9f6a6XCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_91d8a4564df24299a24bee2688c9f6a6XCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_91d8a4564df24299a24bee2688c9f6a6XCHRTP006ciscocom_-- From nobody Fri Jul 14 11:24:51 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 884F5131691 for ; Fri, 14 Jul 2017 11:24:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KJz_-vUu7xkN for ; Fri, 14 Jul 2017 11:24:49 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A8806127978 for ; Fri, 14 Jul 2017 11:24:48 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DRD33744; Fri, 14 Jul 2017 18:24:46 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.301.0; Fri, 14 Jul 2017 19:24:45 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.142]) by SJCEML701-CHM.china.huawei.com ([169.254.3.186]) with mapi id 14.03.0301.000; Fri, 14 Jul 2017 11:24:42 -0700 From: James N Guichard To: "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQ Date: Fri, 14 Jul 2017 18:24:42 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.148.15] Content-Type: multipart/alternative; boundary="_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0D62SJCEML702CHMchina_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.59690C6F.0006, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.142, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 9121345f4c62bdf7827dcd79a828b2e7 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 18:24:50 -0000 --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0D62SJCEML702CHMchina_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0D62SJCEML702CHMchina_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On= Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0D62SJCEML702CHMchina_-- From nobody Fri Jul 14 11:50:51 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 93A881316DA for ; Fri, 14 Jul 2017 11:50:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LHZqeXaIFlHv for ; Fri, 14 Jul 2017 11:50:45 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 955F4130134 for ; Fri, 14 Jul 2017 11:50:45 -0700 (PDT) Received: from BLR-EXCHP-2.sandvine.com (192.168.196.172) by WTL-EXCHP-2.sandvine.com (192.168.194.177) with Microsoft SMTP Server (TLS) id 14.3.319.2; Fri, 14 Jul 2017 14:50:43 -0400 Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by blr-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Fri, 14 Jul 2017 14:50:44 -0400 From: Dave Dolson To: James N Guichard , "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WA= Date: Fri, 14 Jul 2017 18:50:42 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.200.114] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_E8355113905631478EFF04F5AA706E98A9060316wtlexchp2sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 18:50:48 -0000 --_000_E8355113905631478EFF04F5AA706E98A9060316wtlexchp2sandvi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_E8355113905631478EFF04F5AA706E98A9060316wtlexchp2sandvi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mai= lto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_E8355113905631478EFF04F5AA706E98A9060316wtlexchp2sandvi_-- From nobody Fri Jul 14 13:08:10 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13E1C13193F for ; Fri, 14 Jul 2017 13:08:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uj2T8FCZC89j for ; Fri, 14 Jul 2017 13:08:07 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6721513191C for ; Fri, 14 Jul 2017 13:08:07 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 43B35240412; Fri, 14 Jul 2017 13:08:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1500062887; bh=uH05ZLcZ2sOeZy3moJNGH1eiLRSZnWoBMJEgcUFUPHo=; h=Subject:To:References:From:Date:In-Reply-To:From; b=H/axb3sBUf8pNNDvksnoIqoH4UuJyLCPef2mzJBYIYr7m9i4GubLrtnp9K7hohniG aRqETPZ739SHr218AsYxD9cIUjnF8zJFyzOWXMbzfptBifWFSLg0Mx857o/Yqqpszn Tdo1Rme/+GzLYBLgPVxE0cyvhxa6DscJMbstZzhM= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 0179824503B; Fri, 14 Jul 2017 13:08:05 -0700 (PDT) To: Dave Dolson , James N Guichard , "Kent Leung (kleung)" , "sfc@ietf.org" References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> From: "Joel M. Halpern" Message-ID: Date: Fri, 14 Jul 2017 16:08:05 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 20:08:09 -0000 I find myself torn. (And speaking personally in all that follows.) There are actually two issues buried onder here. Unless the reverse SFP is set up, and is congurent, the forwarding state may not exist. Congruent reverse is only required when the nature of the SFP is such that reverse traffic must go through the same seqeunce of SFs, albeit in the reverse order, as the forward traffic. That is not mandatory. Even if some elements are common (as for example a TCP proxy), that doe snot mean that all are common and that full congruence is required. To make this clearer, given an SFP that goes through SFFs A, B, and C, there is no requirement that SFF B have forwarding state for any specific SPI / SI to take reverse traffic. So one of the points is to be explicit that a backwards path needs to be established (by control, routing, magic, ...) from those entities which need to send such reverse packets. Which means that someone has to be able to determine where that is required. Now, if we assume that piece of knowledge gets communicated, and the path is established, the quesiton you are asking is how to identify that reverse path. I take Dave's point that there is a simplicity and efficiency in using the same SPI. I find it conflicts with my personal view on how SPIs work. But that is my problem, not the WGs. The strong argument in favor is in fact that there can only be 64 different SIs in each direction, so there is plenty of room to keep things far enough apart that accidental wrap is not possible. Net: using the SI grates on my nerves, but is probably sufficiently robust that it is a very reasonable choice. Yours, Joel On 7/14/17 2:50 PM, Dave Dolson wrote: > There is not actually forwarding ambiguity, since SFF forwarding depends > on **both** SPI and SI. > > So for example, there is no ambiguity in forwarding to use SI in the > range [0,127] of up-link and range [128,255] for down-link, on the same SPI. > > The limitation is ~127 SFs per path instead of ~255. > > As I see it, Kent’s question is one of aesthetics. Do folks like the > same SPI used for two directions? > > Personally, I find use of a single SPI to be more elegant, consuming > only one path ID instead of two. (section 5.4.1). > > It may make debugging easier as well. > > Also, for what it’s worth, we demonstrated this method of section 5.4.1 > at a previous IETF hackathon. > > -Dave > > *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N Guichard > *Sent:* Friday, July 14, 2017 2:25 PM > *To:* Kent Leung (kleung); sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi Kent, > > [personal opinion …] I have always assumed that the service path ID > would be uni-directional given that it would be difficult to avoid > collision in all forwarding scenarios. If you look at a basic SFC a-b-c > and the service index is set to 255 at the classifiers a & c (which imho > will be the normal practice) then at b you would have a conflict if the > same service path ID is used in both directions. > > Jim > > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung (kleung) > *Sent:* Friday, July 14, 2017 1:58 PM > *To:* sfc@ietf.org > *Subject:* [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > Hi. We are working on a revision for this draft. There were 4 proposed > solution options in section 5. During some discussions, most folks seem > to favor the use of algorithmic method in section 5.4. However, there > are 2 sub-options. One is based on same Service Path ID and using > Service Index to determine flow direction (sect. 5.4.1). The other is > based on setting high order bit on Serve Path ID, which determines flow > direction (sect. 5.4.2). There are mixed opinions. One reason is that > there may be the assumption the Service Path ID is uni-directional. No > explicit wording of that nature has been encountered in the RFCs, maybe > we missed something? > > If Serve Path ID is required to be uni-directional, then the answer is > easy (=> 5.4.2). We would like to solicit WG comments to get rough > consensus and revised the next version with that solution. This problem > is critical to address for Service Function that generate packet in > reverse direction, especially security service functions as mentioned in > draft-wang-sfc-ns-use-cases. > > Thanks. > > Kent > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Fri Jul 14 13:15:45 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BD9B6131A54 for ; Fri, 14 Jul 2017 13:15:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HpidWI7d1Wii for ; Fri, 14 Jul 2017 13:15:41 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 14D32131950 for ; Fri, 14 Jul 2017 13:15:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=13999; q=dns/txt; s=iport; t=1500063340; x=1501272940; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=ORkWcn7LdyU64RmSnTaxqKtvNXWsMytVpj0eCJrUrPc=; b=ARSzokJkA7lwisFJiEx691mWgjtw/eBx04mpJWJ0OzSybu22XW9yCWrx D51M//LNDvorxc01H6XzIeDGSn2hZ62KOOWfCNl1A+W9ofFYMt7MmuXzW m3syZ3lXlMYYT48HDLcregHwiBLr0JU96Ph1mv3rW3Q7RXf15f7S7/W7H s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DNAAAbJmlZ/4MNJK1eGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBgm9rZIEUB44EkWKQWIUsghGFdgKDcT8YAQIBAQEBAQEBayiFGAEBAQE?= =?us-ascii?q?DLVwCAQgOAwQBASgHMhQJCAEBBAESCBOJMGSwMYsgAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBHYMog02FBYUghT4FilCMcIdxAosRiHiSN5VVAR84gQp1FYdfdgGHZoE?= =?us-ascii?q?NAQEB?= X-IronPort-AV: E=Sophos;i="5.40,359,1496102400"; d="scan'208,217";a="273170779" Received: from alln-core-1.cisco.com ([173.36.13.131]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 14 Jul 2017 20:15:39 +0000 Received: from XCH-RTP-008.cisco.com (xch-rtp-008.cisco.com [64.101.220.148]) by alln-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v6EKFdol026178 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 14 Jul 2017 20:15:39 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-008.cisco.com (64.101.220.148) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 14 Jul 2017 16:15:38 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Fri, 14 Jul 2017 16:15:38 -0400 From: "Kent Leung (kleung)" To: Dave Dolson , James N Guichard , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAAAxzH0A== Date: Fri, 14 Jul 2017 20:15:38 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.63.127] Content-Type: multipart/alternative; boundary="_000_a1bf2985b3674f9588a914566cefc70fXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 20:15:44 -0000 --_000_a1bf2985b3674f9588a914566cefc70fXCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks for clarifying that in the case of same service path ID for both flo= ws of a connection, the service index range is partitioned as described in = sect. 5.4.1. I'm not sure if this is purely "aesthetics" as there may be as= sumption that service path ID identifies the direction of the flow. The mea= ning of service index is the sequence of service functions in the path. The= re are two distinct flows and each flow follows a path. That's why I lean t= oward sect. 5.4.2 (unique service path ID per flow/direction). But I can be= convinced to using one service path ID. :) Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 8:51 PM To: James N Guichard ; Kent Leung (kleung) ; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_a1bf2985b3674f9588a914566cefc70fXCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks for clarifying that in the case of same service path ID for bo= th flows of a connection, the service index range is partitioned as describ= ed in sect. 5.4.1. I’m not sure if this is purely “aesthetics” as there may be assumption that service= path ID identifies the direction of the flow. The meaning of service index= is the sequence of service functions in the path. There are two distinct f= lows and each flow follows a path. That’s why I lean toward sect. 5.4.2 (unique service path ID per flow/direction). But= I can be convinced to using one service path ID. J

 

Kent

 

From: Dave Dolson [mailto:ddolson@sandvine.co= m]
Sent: Friday, July 14, 2017 8:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung= (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_a1bf2985b3674f9588a914566cefc70fXCHRTP006ciscocom_-- From nobody Fri Jul 14 13:28:56 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DE81C12EA52 for ; Fri, 14 Jul 2017 13:28:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.302 X-Spam-Level: X-Spam-Status: No, score=-4.302 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=f5.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5Bd7I8Xn2QFM for ; Fri, 14 Jul 2017 13:28:51 -0700 (PDT) Received: from mail15.f5.com 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sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 182A81316E5 for ; Fri, 14 Jul 2017 13:37:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8byRwszG9taH for ; Fri, 14 Jul 2017 13:37:48 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 32E7412EB13 for ; Fri, 14 Jul 2017 13:37:48 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 1C478D60394; Fri, 14 Jul 2017 13:37:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1500064668; bh=EQFYiu7Ix0o4814v7u0LrNfFYfS3dFVxzfwh4InBR+Y=; h=Subject:To:References:From:Date:In-Reply-To:From; b=ClNZVj4iu7tni5oQgAGJ9zzpvpxxHuJsaCGmUABkXfoEczTqlowJZbEjAH7SNjLzX GZrbarwUMndCsFD/UTeRnM4PbwL5f01STyeadUx9eBoa40umEx/4RuzG9/bZjbCy+5 GfghlhS9UNYGbKYR4FWaQzyvwPM6m9kdojQJntLY= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [50.225.209.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 8F21F240412; Fri, 14 Jul 2017 13:37:46 -0700 (PDT) To: Sumandra Majee , Dave Dolson , James N Guichard , "Kent Leung (kleung)" , "sfc@ietf.org" References: <47E28E62-CE9E-47D4-989C-CFA81E6092B7@f5.com> From: "Joel M. Halpern" Message-ID: <05b0cf67-5d75-57d5-c15e-55d5d796b013@joelhalpern.com> Date: Fri, 14 Jul 2017 16:37:45 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <47E28E62-CE9E-47D4-989C-CFA81E6092B7@f5.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 20:37:50 -0000 The current architecture and the current NSH document both avoid any discussion of or implication of using a MASK applied to the SP-ID. It is a large field because of the range of use cases that were requested to be supported (some of which use a large number of service function paths. Evne this use is compatible with using the full SP-ID and SI as the lookup keys for the forwarding decision. Yours, Joel On 7/14/17 4:28 PM, Sumandra Majee wrote: > Fundamentally it is all about how divide up the SPI+SI space. > > However, we like the service path SPI to be unique per direction. If the > forward and reverse path reversing the order of traversal then use a bit > flag (simple algorithmic) to derive the reverse SPI. This is sort of how > our implementation works today. > > While we are at SPI bitfield allocation topic, 24 bit is quite a lot, > apologies if it has been disused earlier. > > I am sure implementers would use many of those bits for various other > things, in that case SFF needs to know the MASK flag to separate out > forwarding table pointer. > > SPI-fwding-tablePtr = SP & MASK > > *From: *sfc on behalf of Dave Dolson > > *Date: *Friday, July 14, 2017 at 11:50 AM > *To: *James N Guichard , "Kent Leung > (kleung)" , "sfc@ietf.org" > *Subject: *Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > There is not actually forwarding ambiguity, since SFF forwarding depends > on **both** SPI and SI. > > So for example, there is no ambiguity in forwarding to use SI in the > range [0,127] of up-link and range [128,255] for down-link, on the same SPI. > > The limitation is ~127 SFs per path instead of ~255. > > As I see it, Kent’s question is one of aesthetics. Do folks like the > same SPI used for two directions? > > Personally, I find use of a single SPI to be more elegant, consuming > only one path ID instead of two. (section 5.4.1). > > It may make debugging easier as well. > > Also, for what it’s worth, we demonstrated this method of section 5.4.1 > at a previous IETF hackathon. > > -Dave > > *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N Guichard > *Sent:* Friday, July 14, 2017 2:25 PM > *To:* Kent Leung (kleung); sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi Kent, > > [personal opinion …] I have always assumed that the service path ID > would be uni-directional given that it would be difficult to avoid > collision in all forwarding scenarios. If you look at a basic SFC a-b-c > and the service index is set to 255 at the classifiers a & c (which imho > will be the normal practice) then at b you would have a conflict if the > same service path ID is used in both directions. > > Jim > > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung (kleung) > *Sent:* Friday, July 14, 2017 1:58 PM > *To:* sfc@ietf.org > *Subject:* [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > Hi. We are working on a revision for this draft. There were 4 proposed > solution options in section 5. During some discussions, most folks seem > to favor the use of algorithmic method in section 5.4. However, there > are 2 sub-options. One is based on same Service Path ID and using > Service Index to determine flow direction (sect. 5.4.1). The other is > based on setting high order bit on Serve Path ID, which determines flow > direction (sect. 5.4.2). There are mixed opinions. One reason is that > there may be the assumption the Service Path ID is uni-directional. No > explicit wording of that nature has been encountered in the RFCs, maybe > we missed something? > > If Serve Path ID is required to be uni-directional, then the answer is > easy (=> 5.4.2). We would like to solicit WG comments to get rough > consensus and revised the next version with that solution. This problem > is critical to address for Service Function that generate packet in > reverse direction, especially security service functions as mentioned in > draft-wang-sfc-ns-use-cases. > > Thanks. > > Kent > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Fri Jul 14 14:12:33 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6297012EACC for ; Fri, 14 Jul 2017 14:12:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lSJ5-59vWK7B for ; Fri, 14 Jul 2017 14:12:31 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CA0D0129B34 for ; Fri, 14 Jul 2017 14:12:30 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by WTL-EXCHP-3.sandvine.com ([fe80::3c39:d305:d721:f00a%15]) with mapi id 14.03.0319.002; Fri, 14 Jul 2017 17:12:28 -0400 From: Dave Dolson To: "Joel M. Halpern" , James N Guichard , "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAAC3wtgAAGLUWg Date: Fri, 14 Jul 2017 21:12:27 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.200.114] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 21:12:32 -0000 Joel, Both of the algorithmic approaches discussed need to make assumptions about= the symmetry of the reverse path. (Same SFs, in reverse order.) -Dave -----Original Message----- From: Joel M. Halpern [mailto:jmh@joelhalpern.com]=20 Sent: Friday, July 14, 2017 4:08 PM To: Dave Dolson; James N Guichard; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I find myself torn. (And speaking personally in all that follows.) There are actually two issues buried onder here. Unless the reverse SFP is set up, and is congurent, the forwarding state ma= y not exist. Congruent reverse is only required when the nature of the SFP is such that = reverse traffic must go through the same seqeunce of SFs, albeit in the rev= erse order, as the forward traffic. That is not mandatory. Even if some e= lements are common (as for example a TCP proxy), that doe snot mean that al= l are common and that full congruence is required. To make this clearer, given an SFP that goes through SFFs A, B, and C, ther= e is no requirement that SFF B have forwarding state for any specific SPI /= SI to take reverse traffic. So one of the points is to be explicit that a backwards path needs to be es= tablished (by control, routing, magic, ...) from those entities which need = to send such reverse packets. Which means that someone has to be able to d= etermine where that is required. Now, if we assume that piece of knowledge gets communicated, and the path i= s established, the quesiton you are asking is how to identify that reverse = path. I take Dave's point that there is a simplicity and efficiency in using the = same SPI. I find it conflicts with my personal view on how SPIs work. But= that is my problem, not the WGs. The strong argument in favor is in fact = that there can only be 64 different SIs in each direction, so there is plen= ty of room to keep things far enough apart that accidental wrap is not poss= ible. Net: using the SI grates on my nerves, but is probably sufficiently robust = that it is a very reasonable choice. Yours, Joel On 7/14/17 2:50 PM, Dave Dolson wrote: > There is not actually forwarding ambiguity, since SFF forwarding=20 > depends on **both** SPI and SI. >=20 > So for example, there is no ambiguity in forwarding to use SI in the=20 > range [0,127] of up-link and range [128,255] for down-link, on the same S= PI. >=20 > The limitation is ~127 SFs per path instead of ~255. >=20 > As I see it, Kent's question is one of aesthetics. Do folks like the=20 > same SPI used for two directions? >=20 > Personally, I find use of a single SPI to be more elegant, consuming=20 > only one path ID instead of two. (section 5.4.1). >=20 > It may make debugging easier as well. >=20 > Also, for what it's worth, we demonstrated this method of section=20 > 5.4.1 at a previous IETF hackathon. >=20 > -Dave >=20 > *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N=20 > Guichard > *Sent:* Friday, July 14, 2017 2:25 PM > *To:* Kent Leung (kleung); sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for=20 > draft-penno-sfc-packet >=20 > Hi Kent, >=20 > [personal opinion ...] I have always assumed that the service path ID=20 > would be uni-directional given that it would be difficult to avoid=20 > collision in all forwarding scenarios. If you look at a basic SFC=20 > a-b-c and the service index is set to 255 at the classifiers a & c=20 > (which imho will be the normal practice) then at b you would have a=20 > conflict if the same service path ID is used in both directions. >=20 > Jim >=20 > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung=20 > (kleung) > *Sent:* Friday, July 14, 2017 1:58 PM > *To:* sfc@ietf.org > *Subject:* [sfc] clarification on Service Path ID for=20 > draft-penno-sfc-packet >=20 > Hi. We are working on a revision for this draft. There were 4 proposed=20 > solution options in section 5. During some discussions, most folks=20 > seem to favor the use of algorithmic method in section 5.4. However,=20 > there are 2 sub-options. One is based on same Service Path ID and=20 > using Service Index to determine flow direction (sect. 5.4.1). The=20 > other is based on setting high order bit on Serve Path ID, which=20 > determines flow direction (sect. 5.4.2). There are mixed opinions. One=20 > reason is that there may be the assumption the Service Path ID is=20 > uni-directional. No explicit wording of that nature has been=20 > encountered in the RFCs, maybe we missed something? >=20 > If Serve Path ID is required to be uni-directional, then the answer is=20 > easy (=3D> 5.4.2). We would like to solicit WG comments to get rough=20 > consensus and revised the next version with that solution. This=20 > problem is critical to address for Service Function that generate=20 > packet in reverse direction, especially security service functions as=20 > mentioned in draft-wang-sfc-ns-use-cases. >=20 > Thanks. >=20 > Kent >=20 >=20 >=20 > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc >=20 From nobody Fri Jul 14 16:09:09 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2BBB1287A0 for ; Fri, 14 Jul 2017 16:09:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nH2_R8CYt--h for ; Fri, 14 Jul 2017 16:09:06 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DC4BE126DD9 for ; Fri, 14 Jul 2017 16:09:05 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml703-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DKL53514; Fri, 14 Jul 2017 23:09:03 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml703-cah.china.huawei.com (10.201.108.44) with Microsoft SMTP Server (TLS) id 14.3.301.0; Sat, 15 Jul 2017 00:09:02 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.142]) by SJCEML703-CHM.china.huawei.com ([169.254.5.136]) with mapi id 14.03.0301.000; Fri, 14 Jul 2017 16:08:55 -0700 From: James N Guichard To: Dave Dolson , "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0A== Date: Fri, 14 Jul 2017 23:08:54 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.147.6] Content-Type: multipart/alternative; boundary="_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0DF8SJCEML702CHMchina_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020204.59694F10.0052, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.142, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: dffceeb23954045e61fa64b582abfe2c Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jul 2017 23:09:09 -0000 --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0DF8SJCEML702CHMchina_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard ; Kent Leung (kleung) ; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0DF8SJCEML702CHMchina_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.co= m]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung= (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_BF1BE6D99B52F84AB9B48B7CF6F17DA3EF0DF8SJCEML702CHMchina_-- From nobody Sun Jul 16 04:37:55 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8398112F3CB for ; Sun, 16 Jul 2017 04:37:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8GV82TBj2rxU for ; Sun, 16 Jul 2017 04:37:51 -0700 (PDT) Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 36130126CD8 for ; Sun, 16 Jul 2017 04:37:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=22151; q=dns/txt; s=iport; t=1500205071; x=1501414671; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=GL5JXWQOd1vDvfM6e6/h1MLz8Gj93fbZRzUKxSootb8=; b=V183vkOmxMSqcC/V605EipU/qLZOn7NbZLqoBKTDKdiWfBy+8Hhl2Ae2 bhRo1Qa3TG3Ymhh9z1BNnjSTNtn/zMJoAnbxomtod1bK0IS9IRk7hN3X4 o6NPLl0umdLHn8tneWqMM9vKIF+l671UEaFfeQFaPwKSVUtlMikRaVijP U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DOAADkTmtZ/5hdJa1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBgm8+LWSBFAeOBJFflgSCEYVHAoNxPxgBAgEBAQEBAQFrKIUYAQEBAQM?= =?us-ascii?q?tXAIBCBEEAQEhBwcyFAkIAQEEARIIE4kwZLAdixMBAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEdgyiDTYUFhSCFPgWKUIxyh3ICixKIeZI4lVYBHziBCnUVh192AYdIgQ0?= =?us-ascii?q?BAQE?= X-IronPort-AV: E=Sophos;i="5.40,368,1496102400"; d="scan'208,217";a="455657924" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by alln-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2017 11:37:49 +0000 Received: from XCH-RTP-009.cisco.com (xch-rtp-009.cisco.com [64.101.220.149]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v6GBbnZr028321 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Sun, 16 Jul 2017 11:37:49 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-009.cisco.com (64.101.220.149) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Sun, 16 Jul 2017 07:37:48 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Sun, 16 Jul 2017 07:37:48 -0400 From: "Kent Leung (kleung)" To: James N Guichard , Dave Dolson , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ABL+q8g Date: Sun, 16 Jul 2017 11:37:48 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.105.89] Content-Type: multipart/alternative; boundary="_000_be86de5fc01b47a6ab90bfdb23c1e89fXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 Jul 2017 11:37:53 -0000 --_000_be86de5fc01b47a6ab90bfdb23c1e89fXCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Good discussion. I hope to correctly capture the preference of folks who ha= d chimed in on this topic. It doesn't seem we've reached rough consensus. Sect 5.4.1 (one service path ID, service index indicates flow direction): - Sumandra, Jim, Kent, Renaldo Sect 5.4.2 (two service path IDs, each indicate flow direction): - Dave, Joel BTW, I think both methods can support asymmetric paths as described in sect= . 4. Kent From: James N Guichard [mailto:james.n.guichard@huawei.com] Sent: Saturday, July 15, 2017 1:09 AM To: Dave Dolson ; Kent Leung (kleung) ; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_be86de5fc01b47a6ab90bfdb23c1e89fXCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Good discussion. I hope to correctly capture the preference of folks = who had chimed in on this topic. It doesn’t seem we’ve reached = rough consensus.

 

Sect 5.4.1 (one service path ID, service index indic= ates flow direction):

 

<= span style=3D"color:#1F497D">-     &= nbsp;    Sumandra, Jim,= Kent, Renaldo

 

Sect 5.4.2 (two service path IDs, each indicate flow= direction):

 

<= span style=3D"color:#1F497D">-     &= nbsp;    Dave, Joel

 

BTW, I think both methods can support asymmetric pat= hs as described in sect. 4.

 

Kent

 

 

From: James N Guichard [mailto:james.n.guicha= rd@huawei.com]
Sent: Saturday, July 15, 2017 1:09 AM
To: Dave Dolson <ddolson@sandvine.com>; Kent Leung (kleung) &l= t;kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_be86de5fc01b47a6ab90bfdb23c1e89fXCHRTP006ciscocom_-- From nobody Sun Jul 16 13:11:00 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 02BB2124D37 for ; Sun, 16 Jul 2017 13:10:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yGA_ijRxAMeq for ; Sun, 16 Jul 2017 13:10:56 -0700 (PDT) Received: from rcdn-iport-7.cisco.com (rcdn-iport-7.cisco.com [173.37.86.78]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 90785124217 for ; Sun, 16 Jul 2017 13:10:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=24230; q=dns/txt; s=iport; t=1500235856; x=1501445456; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=VSXcbzAzjeRg/RiVEPYEQhKzbogLMF9WsdcxOjg5kJk=; b=UJF3FSmIKa7R2oFoyRa2yM1DozZ9uJbJZlsCHHA6PK5T3h/BjcT8sWxL SJ0G/dK+L4xBK/sMJccgBy1T+OEYMXV8FHmW4tc3Q9KfrMBYPYaWJ3lMw KZhYQbOREbPTwmFr6ykuQxozQagusfiNz+H21RHzafg9GvGGPnlVNnS7T I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DKAACWx2tZ/5RdJa1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBgm8+LWSBFAeOBJFelgSCEYVHAoNxPxgBAgEBAQEBAQFrKIUYAQEBAQM?= =?us-ascii?q?tXAIBCBEEAQEhBwcyFAkIAQEEARIIE4kwZLATixIBAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEdgyiDTYUFhSCFPgWKUIxyh3ICixKIeZI4lVYBHziBCnUVh192AYdIgQ0?= =?us-ascii?q?BAQE?= X-IronPort-AV: E=Sophos;i="5.40,371,1496102400"; d="scan'208,217";a="268872330" Received: from rcdn-core-12.cisco.com ([173.37.93.148]) by rcdn-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2017 20:10:55 +0000 Received: from XCH-RTP-007.cisco.com (xch-rtp-007.cisco.com [64.101.220.147]) by rcdn-core-12.cisco.com (8.14.5/8.14.5) with ESMTP id v6GKAsIo004463 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Sun, 16 Jul 2017 20:10:55 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-007.cisco.com (64.101.220.147) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Sun, 16 Jul 2017 16:10:54 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Sun, 16 Jul 2017 16:10:54 -0400 From: "Kent Leung (kleung)" To: James N Guichard , Dave Dolson , "sfc@ietf.org" Thread-Topic: clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ABL+q8gABKV2NA= Date: Sun, 16 Jul 2017 20:10:53 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.105.89] Content-Type: multipart/alternative; boundary="_000_aaa15a7d6bc8494cba2562ab04a103bdXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 Jul 2017 20:10:59 -0000 --_000_aaa15a7d6bc8494cba2562ab04a103bdXCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Sorry. Corrected below. Sect 5.4.1 (one service path ID, service index indicates flow direction): - Dave, Joel Sect 5.4.2 (two service path IDs, each indicate flow direction): - Sumandra, Jim, Kent, Renaldo From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Sunday, July 16, 2017 1:38 PM To: James N Guichard ; Dave Dolson ; sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Good discussion. I hope to correctly capture the preference of folks who ha= d chimed in on this topic. It doesn't seem we've reached rough consensus. Sect 5.4.1 (one service path ID, service index indicates flow direction): - Sumandra, Jim, Kent, Renaldo Sect 5.4.2 (two service path IDs, each indicate flow direction): - Dave, Joel BTW, I think both methods can support asymmetric paths as described in sect= . 4. Kent From: James N Guichard [mailto:james.n.guichard@huawei.com] Sent: Saturday, July 15, 2017 1:09 AM To: Dave Dolson >; Kent L= eung (kleung) >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent --_000_aaa15a7d6bc8494cba2562ab04a103bdXCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Sorry. Corrected below.

 

Sect 5.4.1 (one service path ID, service index indic= ates flow direction):

 

<= span style=3D"color:#1F497D">-     &= nbsp;    Dave, Joel

 

Sect 5.4.2 (two service path IDs, each indicate flow= direction):

 

<= span style=3D"color:#1F497D">-     &= nbsp;    Sumandra, Jim,= Kent, Renaldo

 

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On= Behalf Of Kent Leung (kleung)
Sent: Sunday, July 16, 2017 1:38 PM
To: James N Guichard <james.n.guichard@huawei.com>; Dave Dolso= n <ddolson@sandvine.com>; sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Good discussion. I hop= e to correctly capture the preference of folks who had chimed in on this to= pic. It doesn’t seem we’ve reached rough consensus.

 

Sect 5.4.1 (one servic= e path ID, service index indicates flow direction):

 

-&nb= sp;         Sumandra, Jim,= Kent, Renaldo

 

Sect 5.4.2 (two servic= e path IDs, each indicate flow direction):

 

-&nb= sp;         Dave, Joel

 

BTW, I think both meth= ods can support asymmetric paths as described in sect. 4.

 

Kent=

 

 

From: James N Guichard [mailto:james.n.guichard@huawei.com]
Sent: Saturday, July 15, 2017 1:09 AM
To: Dave Dolson <ddolson@= sandvine.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

--_000_aaa15a7d6bc8494cba2562ab04a103bdXCHRTP006ciscocom_-- From nobody Mon Jul 17 00:14:44 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 204ED131945; Mon, 17 Jul 2017 00:14:35 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.56.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150027567509.32699.13634975789390576041@ietfa.amsl.com> Date: Mon, 17 Jul 2017 00:14:35 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-hierarchical-04.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 07:14:35 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Hierarchical Service Function Chaining (hSFC) Authors : David Dolson Shunsuke Homma Diego R. Lopez Mohamed Boucadair Dapeng Liu Ting Ao Vu Anh Vu Filename : draft-ietf-sfc-hierarchical-04.txt Pages : 27 Date : 2017-07-17 Abstract: Hierarchical Service Function Chaining (hSFC) is a network architecture allowing an organization to decompose a large-scale network into multiple domains of administration. The goals of hSFC are to make a large-scale network easier to reason about, simpler to control and to support independent functional groups within large network operators. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-hierarchical/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-hierarchical-04 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-hierarchical-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-hierarchical-04 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Jul 17 00:17:35 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1ED28131A50 for ; Mon, 17 Jul 2017 00:17:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9rGlxqtXr60C for ; Mon, 17 Jul 2017 00:17:31 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C49E8131A5F for ; Mon, 17 Jul 2017 00:17:28 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Mon, 17 Jul 2017 03:17:27 -0400 From: Dave Dolson To: "sfc@ietf.org" Thread-Topic: New Version Notification for draft-ietf-sfc-hierarchical-04.txt Thread-Index: AQHS/sxZpNxnN2LIKUS0oVI1s6cwyaJXnAag Date: Mon, 17 Jul 2017 07:17:27 +0000 Message-ID: References: <150027567526.32699.11264090255886970410.idtracker@ietfa.amsl.com> In-Reply-To: <150027567526.32699.11264090255886970410.idtracker@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [31.133.142.50] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: [sfc] FW: New Version Notification for draft-ietf-sfc-hierarchical-04.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 07:17:33 -0000 Rm9sa3MsDQpQbGVhc2Ugc2VlIHRoZSBsYXRlc3QgdmVyc2lvbiwgY29udGFpbmluZyBmaXhlcyBt b3N0bHkgZHVlIHRvIGNvbW1lbnRzIGZyb20gR3JlZyBNaXJza3kuDQoNCi1EYXZlDQoNCg0KLS0t LS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCkZyb206IGludGVybmV0LWRyYWZ0c0BpZXRmLm9yZyBb bWFpbHRvOmludGVybmV0LWRyYWZ0c0BpZXRmLm9yZ10gDQpTZW50OiBNb25kYXksIEp1bHkgMTcs IDIwMTcgOToxNSBBTQ0KVG86IFRpbmcgQW87IFZ1IFZ1OyBNb2hhbWVkIEJvdWNhZGFpcjsgRGll Z28gTG9wZXo7IFNodW5zdWtlIEhvbW1hOyBEaWVnbyBSLiBMb3BlejsgRGFwZW5nIExpdTsgRGF2 ZSBEb2xzb247IFZ1IEFuaCBWdQ0KU3ViamVjdDogTmV3IFZlcnNpb24gTm90aWZpY2F0aW9uIGZv ciBkcmFmdC1pZXRmLXNmYy1oaWVyYXJjaGljYWwtMDQudHh0DQoNCg0KQSBuZXcgdmVyc2lvbiBv ZiBJLUQsIGRyYWZ0LWlldGYtc2ZjLWhpZXJhcmNoaWNhbC0wNC50eHQNCmhhcyBiZWVuIHN1Y2Nl c3NmdWxseSBzdWJtaXR0ZWQgYnkgRGF2aWQgRG9sc29uIGFuZCBwb3N0ZWQgdG8gdGhlDQpJRVRG IHJlcG9zaXRvcnkuDQoNCk5hbWU6CQlkcmFmdC1pZXRmLXNmYy1oaWVyYXJjaGljYWwNClJldmlz aW9uOgkwNA0KVGl0bGU6CQlIaWVyYXJjaGljYWwgU2VydmljZSBGdW5jdGlvbiBDaGFpbmluZyAo aFNGQykNCkRvY3VtZW50IGRhdGU6CTIwMTctMDctMTYNCkdyb3VwOgkJc2ZjDQpQYWdlczoJCTI3 DQpVUkw6ICAgICAgICAgICAgaHR0cHM6Ly93d3cuaWV0Zi5vcmcvaW50ZXJuZXQtZHJhZnRzL2Ry YWZ0LWlldGYtc2ZjLWhpZXJhcmNoaWNhbC0wNC50eHQNClN0YXR1czogICAgICAgICBodHRwczov L2RhdGF0cmFja2VyLmlldGYub3JnL2RvYy9kcmFmdC1pZXRmLXNmYy1oaWVyYXJjaGljYWwvDQpI dG1saXplZDogICAgICAgaHR0cHM6Ly90b29scy5pZXRmLm9yZy9odG1sL2RyYWZ0LWlldGYtc2Zj LWhpZXJhcmNoaWNhbC0wNA0KSHRtbGl6ZWQ6ICAgICAgIGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0 Zi5vcmcvZG9jL2h0bWwvZHJhZnQtaWV0Zi1zZmMtaGllcmFyY2hpY2FsLTA0DQpEaWZmOiAgICAg ICAgICAgaHR0cHM6Ly93d3cuaWV0Zi5vcmcvcmZjZGlmZj91cmwyPWRyYWZ0LWlldGYtc2ZjLWhp ZXJhcmNoaWNhbC0wNA0KDQpBYnN0cmFjdDoNCiAgIEhpZXJhcmNoaWNhbCBTZXJ2aWNlIEZ1bmN0 aW9uIENoYWluaW5nIChoU0ZDKSBpcyBhIG5ldHdvcmsNCiAgIGFyY2hpdGVjdHVyZSBhbGxvd2lu ZyBhbiBvcmdhbml6YXRpb24gdG8gZGVjb21wb3NlIGEgbGFyZ2Utc2NhbGUNCiAgIG5ldHdvcmsg aW50byBtdWx0aXBsZSBkb21haW5zIG9mIGFkbWluaXN0cmF0aW9uLg0KDQogICBUaGUgZ29hbHMg b2YgaFNGQyBhcmUgdG8gbWFrZSBhIGxhcmdlLXNjYWxlIG5ldHdvcmsgZWFzaWVyIHRvIHJlYXNv bg0KICAgYWJvdXQsIHNpbXBsZXIgdG8gY29udHJvbCBhbmQgdG8gc3VwcG9ydCBpbmRlcGVuZGVu dCBmdW5jdGlvbmFsDQogICBncm91cHMgd2l0aGluIGxhcmdlIG5ldHdvcmsgb3BlcmF0b3JzLg0K DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgDQoNCg0KUGxlYXNlIG5vdGUgdGhhdCBpdCBtYXkg dGFrZSBhIGNvdXBsZSBvZiBtaW51dGVzIGZyb20gdGhlIHRpbWUgb2Ygc3VibWlzc2lvbg0KdW50 aWwgdGhlIGh0bWxpemVkIHZlcnNpb24gYW5kIGRpZmYgYXJlIGF2YWlsYWJsZSBhdCB0b29scy5p ZXRmLm9yZy4NCg0KVGhlIElFVEYgU2VjcmV0YXJpYXQNCg0K From nobody Mon Jul 17 00:20:58 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4652B131947; Mon, 17 Jul 2017 00:20:50 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.56.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150027605024.32552.14622749861768310101@ietfa.amsl.com> Date: Mon, 17 Jul 2017 00:20:50 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-14.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 07:20:50 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Network Service Header (NSH) Authors : Paul Quinn Uri Elzur Carlos Pignataro Filename : draft-ietf-sfc-nsh-14.txt Pages : 32 Date : 2017-07-16 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-14 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-14 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-14 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_F241AD1DA0074AC7A2B019550F1FF52Cciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
I agree on the operational aspect: having different SPI's for each dir= ection simplifies the troubleshooting procedures, as statistics on the pack= ets counters for each direction on each SF, can be displayed just based on = SPI.
Regards,
Roberta 

Inviato da iPad

Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.iet= f.org/mailman/listinfo/sfc
--_000_F241AD1DA0074AC7A2B019550F1FF52Cciscocom_-- From nobody Mon Jul 17 04:30:08 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7070E12EBF7 for ; Mon, 17 Jul 2017 04:30:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sWf5c4MZKocx for ; Mon, 17 Jul 2017 04:30:06 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 536221288B8 for ; Mon, 17 Jul 2017 04:30:06 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id 3AE285C0029 for ; Mon, 17 Jul 2017 04:30:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1500291006; bh=3ktmGcxDrPSNAAUeJIZRitM72j8Kdc5HzmArCNqT6uU=; h=To:From:Subject:Date:From; b=PoQaprFKiFohbAQHJ5MvH5YNtQQbMCa8TeGuErAy7zD7J3T49rA94oT1JFIPZt+Y7 B9Q4NrTeTbYpaXaBAlpcSw/BemseeAuVg9oW39SOmYMhhReRHGfT+6Jxuc4/7csh5E HpaupoSw3e5g5nUonbCKhrWVw38YEiBGRe7xEFFk= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from dhcp-84b9.meeting.ietf.org (dhcp-84b9.meeting.ietf.org [31.133.132.185]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id AF6981C0274 for ; Mon, 17 Jul 2017 04:30:05 -0700 (PDT) To: "sfc@ietf.org" From: "Joel M. Halpern" Message-ID: <8cb54041-bc79-868e-f302-c7625e472146@joelhalpern.com> Date: Mon, 17 Jul 2017 07:30:06 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] Advancing the NSH document X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 11:30:07 -0000 Draft -14 has been posted this morning. As far as the chairs can tell, this resolves the items mentioned since the posting of -13, and therefore resolves all WG comments (with rough consensus; we understand that there are still pieces individuals would like to see changed.) Below is the shepherd writeup I expect to submit as part of the handoff to Alia for moving this document forward. Essay format shepherd writeup for draft-ietf-sfc-nsh-14 The writeup is being prepared by one of the working group co-chairs, Joel Halpern. It is prepared for consideration by the community, the IESG, and the responsible AD, Alia Atlas. This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated ervice path. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) Architecture (defined in RFC7665). The working group is requesting that this packet format and handling information be published as a Proposed Standard RFC. It defines an interoperable mechanism to achieve the stated goals. There are multiple corporate and open source implementations of this protocol. The working group has had many discussions on this document. Many individuals from many companies have helped bring together this solution. Over the last 9 months significant effort has gone into fixing issues raised by earlier reviews. While there is still some disagreement, all technical limitations are identified in the document and dealt with in fashions acceptable to the rough consensus of the working group. As required by IETF process, all front page editors have explicitly confirmed that there is no undisclosed relevant IPR. This document does normatively reference and build upon RFC 7665, which is an informational RFC published by the working group. Thank you, Joel (and Jim) From nobody Mon Jul 17 04:47:32 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F43D131B30 for ; Mon, 17 Jul 2017 04:47:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zSM_v9WnuI4z for ; Mon, 17 Jul 2017 04:47:30 -0700 (PDT) Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2C9F41287A5 for ; Mon, 17 Jul 2017 04:47:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1907; q=dns/txt; s=iport; t=1500292050; x=1501501650; h=from:to:subject:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version; bh=Mh6wK4m8aw9P+JqXwKPRvtLhvIupOBlbKH5KgqYxurU=; b=gsdRjHEXkCpp/+qrPXM/Ap8RxKxCrAv3VxfHjabG4xnYQiZWBt4IUN/V FSwjP8VW8A7F1WxQ6fLvXQRZdvuVBAzsQUts7MKRfFzkUpdp9zXzlEcLh +4o/67CW6PReAvqbmKujlQumwJTCvURK7V9OZyrMu7Ut7dKjoAxHKs6qa c=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DLAAAEo2xZ/4ENJK1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBg1pkgRSOC5FflgSCESELhRsCg3g/GAECAQEBAQEBAWsdC4UYAQEBAQI?= =?us-ascii?q?BAQE4NBALAgEIEgYeECcLFw4CBBOKJwgQsU6LFAEBAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAR2DKINNggyCeYMmgUSDQ4IxBZ80AodIjEyCDFeEeIpUlVYBHziBCnUVHyo?= =?us-ascii?q?SAYcDdokMAQEB?= X-IronPort-AV: E=Sophos;i="5.40,374,1496102400"; d="scan'208";a="456055713" Received: from alln-core-9.cisco.com ([173.36.13.129]) by alln-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 17 Jul 2017 11:47:29 +0000 Received: from XCH-RTP-017.cisco.com (xch-rtp-017.cisco.com [64.101.220.157]) by alln-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v6HBlTiS030562 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Mon, 17 Jul 2017 11:47:29 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 07:47:28 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 07:47:28 -0400 From: "Carlos Pignataro (cpignata)" To: "sfc@ietf.org" Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-nsh-14.txt Thread-Index: AQHS/s1NxFX92WaGVUmUqDZuhOXx0qJX51OW Date: Mon, 17 Jul 2017 11:47:28 +0000 Message-ID: <7DDA02B2-82BB-4FCD-948B-457C714FA34B@cisco.com> References: <150027605024.32552.14622749861768310101@ietfa.amsl.com> In-Reply-To: <150027605024.32552.14622749861768310101@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] I-D Action: draft-ietf-sfc-nsh-14.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 11:47:31 -0000 SFC, This revision catches up with all the pending edits and updates as discusse= d and agreed on the list.=20 Sent from my iPad > On Jul 17, 2017, at 9:21 AM, "internet-drafts@ietf.org" wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Service Function Chaining of the IETF. >=20 > Title : Network Service Header (NSH) > Authors : Paul Quinn > Uri Elzur > Carlos Pignataro > Filename : draft-ietf-sfc-nsh-14.txt > Pages : 32 > Date : 2017-07-16 >=20 > Abstract: > This document describes a Network Service Header (NSH) inserted onto > packets or frames to realize service function paths. NSH also > provides a mechanism for metadata exchange along the instantiated > service paths. NSH is the SFC encapsulation required to support the > Service Function Chaining (SFC) architecture (defined in RFC7665). >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-sfc-nsh-14 > https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-14 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sfc-nsh-14 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc From nobody Mon Jul 17 05:39:56 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B42FD131898 for ; 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17 Jul 2017 12:39:52 +0000 Received: from XCH-RCD-006.cisco.com (xch-rcd-006.cisco.com [173.37.102.16]) by rcdn-core-7.cisco.com (8.14.5/8.14.5) with ESMTP id v6HCdqLS030425 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 17 Jul 2017 12:39:52 GMT Received: from xch-rcd-008.cisco.com (173.37.102.18) by XCH-RCD-006.cisco.com (173.37.102.16) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 07:39:51 -0500 Received: from xch-rcd-008.cisco.com ([173.37.102.18]) by XCH-RCD-008.cisco.com ([173.37.102.18]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 07:39:51 -0500 From: "Paul Quinn (paulq)" To: Sumandra Majee CC: Dave Dolson , James N Guichard , "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AQHS/N/NijlxPpxFQhyonVi4uiBr2aJYTasA Date: Mon, 17 Jul 2017 12:39:51 +0000 Message-ID: <67A50C77-5813-41DB-818C-EFDC00EC397F@cisco.com> References: <47E28E62-CE9E-47D4-989C-CFA81E6092B7@f5.com> In-Reply-To: <47E28E62-CE9E-47D4-989C-CFA81E6092B7@f5.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.19.17.231] Content-Type: multipart/alternative; boundary="_000_67A50C77581341DB818CEFDC00EC397Fciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 12:39:56 -0000 --_000_67A50C77581341DB818CEFDC00EC397Fciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable On Jul 14, 2017, at 4:28 PM, Sumandra Majee > wrote: Fundamentally it is all about how divide up the SPI+SI space. However, we like the service path SPI to be unique per direction. I do as well. It's simple and allows an operator to easily troubleshoot a = path. --_000_67A50C77581341DB818CEFDC00EC397Fciscocom_ Content-Type: text/html; charset="us-ascii" Content-ID: <0CE02EB73BAAC14FBB2A19EE86B22A2C@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
On Jul 14, 2017, at 4:28 PM, Sumandra Majee <S.Majee@F5.com> wrote:

Fundamentally it is all about how divide up the SPI+SI space.
However, we like the service path SPI to be unique per direction.

I do as well.  It's simple and allows an operator to easily troub= leshoot a path.

--_000_67A50C77581341DB818CEFDC00EC397Fciscocom_-- From nobody Mon Jul 17 06:01:07 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 631F4131B6F for ; Mon, 17 Jul 2017 06:01:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id waibdReBlA5R for ; Mon, 17 Jul 2017 06:01:04 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CC231131B6E for ; Mon, 17 Jul 2017 06:01:03 -0700 (PDT) Received: from BLR-EXCHP-2.sandvine.com (192.168.196.172) by WTL-EXCHP-3.sandvine.com (192.168.196.177) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 17 Jul 2017 09:01:02 -0400 Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by blr-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Mon, 17 Jul 2017 09:01:02 -0400 From: Dave Dolson To: "Roberta Maglione (robmgl)" , James N Guichard CC: "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OA= Date: Mon, 17 Jul 2017 13:01:02 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [31.133.142.50] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_E8355113905631478EFF04F5AA706E98A9064B5Cwtlexchp2sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 13:01:06 -0000 --_000_E8355113905631478EFF04F5AA706E98A9064B5Cwtlexchp2sandvi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_E8355113905631478EFF04F5AA706E98A9064B5Cwtlexchp2sandvi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Strictly, stats should= be per SPI and SI, in order to support the so-called spiral.

But I can see how folk= s might find the lazy implementation to be useful.

 

From: Roberta = Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspect: having different = SPI's for each direction simplifies the troubleshooting procedures, as stat= istics on the packets counters for each direction on each SF, can be displa= yed just based on SPI.

Regards,

Roberta 

Inviato da iPad


Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.or= g
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

____________________________________= ___________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/= mailman/listinfo/sfc

--_000_E8355113905631478EFF04F5AA706E98A9064B5Cwtlexchp2sandvi_-- From nobody Mon Jul 17 06:29:21 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 88A35131B9B for ; Mon, 17 Jul 2017 06:29:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q-F1_KPCGkjt for ; Mon, 17 Jul 2017 06:29:14 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 04AFD131B8A for ; Mon, 17 Jul 2017 06:29:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=4861; q=dns/txt; s=iport; t=1500298153; x=1501507753; h=from:to:subject:date:message-id:mime-version; bh=L+hXuHjeBciJ30DSze/iSbA+ufRqIRWENXfewR1ope8=; b=PH85lu6Va5ykxaJm+2ghNTuRElP89KZoLz32Qp6UNifhaVO1r0PtB1in xa9y+wEdRfQpLTcDX9VXgqsWz0ehXHVIu1dtqgUcE8BMqDwAloc5T1J+V +WJ3WyYk/ozWS7pSSmuGzzAyMp91KxwCXZCjGYYyytksA6UPqMHW0iosc g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0C8AQCgumxZ/40NJK1cHAEBBAEBCgEBg?= =?us-ascii?q?m8+LWSBG44EojeFLIIRiT4/GAECAQEBAQEBAWsdC4VMXgEaG0sXDwEEG4lDZLF?= =?us-ascii?q?XixQBAQEBBgEBAQEBASKDKINNgWGITYU1BZdCh3IClAuSOJVWAR84gQp1FYdfi?= =?us-ascii?q?HWBDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,374,1496102400"; d="scan'208,217";a="260590630" Received: from alln-core-8.cisco.com ([173.36.13.141]) by rcdn-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 17 Jul 2017 13:29:13 +0000 Received: from XCH-RTP-009.cisco.com (xch-rtp-009.cisco.com [64.101.220.149]) by alln-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id v6HDTCwY024289 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Mon, 17 Jul 2017 13:29:13 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-009.cisco.com (64.101.220.149) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 09:29:12 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 09:29:12 -0400 From: "Kent Leung (kleung)" To: "sfc@ietf.org" Thread-Topic: forwarding clarification on draft-ietf-sfc-offloads Thread-Index: AdL+/slMp3raszYyTAW95QvwYpmusQ== Date: Mon, 17 Jul 2017 13:29:12 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.39.71] Content-Type: multipart/alternative; boundary="_000_b1a2028be451496d8484a1ab3455e7fcXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: [sfc] forwarding clarification on draft-ietf-sfc-offloads X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 13:29:16 -0000 --_000_b1a2028be451496d8484a1ab3455e7fcXCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi. The draft-ietf-sfc-offloads describes bypassing SF for flow offload. Sk= ipping a hop requires service index (SI) to be decremented by SFF. But thi= s is not covered in the draft. Currently, SFC architecture is based on SFF = forwarding based on service path ID and SI (which is only decremented by SF= or SFC Proxy). draft-ietf-sfc-nsh: Service Index (SI): provides location within the SFP. The initial classifier for a given SFP SHOULD set the SI to 255, however the control plane MAY configure the initial value of SI as appropriate (i.e., taking into account the length of the service function path). Service Index MUST be decremented by a value of 1 by Service Functions or by SFC Proxy nodes after performing required services and the new decremented SI value MUST be used in the egress NSH packet. Should the draft be updated with description on how the flow is forwarded t= hrough the service path? Should SFF decrement the SI? Or some other method = to support offload? Kent --_000_b1a2028be451496d8484a1ab3455e7fcXCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi. The draft-ietf-sfc-offloads describes bypassing = SF for flow offload. Skipping a hop requires service index (SI) to be decre= mented by SFF.  But this is not covered in the draft. Currently, SFC a= rchitecture is based on SFF forwarding based on service path ID and SI (which is only decremented by SF or SFC Pr= oxy).

 

draft-ietf-sfc-nsh:

 

Service Index (SI): provides location within the SFP= .  The initial

   classifier for a given SFP SHOULD set t= he SI to 255, however the

   control plane MAY configure the initial= value of SI as appropriate

   (i.e., taking into account the length o= f the service function path).

   Service Index MUST be decremented by a = value of 1 by Service

   Functions or by SFC Proxy nodes after p= erforming required services

   and the new decremented SI value MUST b= e used in the egress NSH

   packet.

 

Should the draft be updated with description on how = the flow is forwarded through the service path? Should SFF decrement the SI= ? Or some other method to support offload?

 

Kent

 

--_000_b1a2028be451496d8484a1ab3455e7fcXCHRTP006ciscocom_-- From nobody Mon Jul 17 06:37:02 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8A161131B9F for ; Mon, 17 Jul 2017 06:37:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XyKtyVq5i72E for ; Mon, 17 Jul 2017 06:36:58 -0700 (PDT) Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B9423131BD4 for ; Mon, 17 Jul 2017 06:36:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=20904; q=dns/txt; s=iport; t=1500298618; x=1501508218; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=vifOaLU5K+nPoRPRALahsWrdWazDwFL3JvrB5WgXOYw=; b=QyRpdQ/vsMPKhKW7ipmjCdhrhvFgPxH1ZAzsTlIGZTrEFlGF+E2zmsL0 +cdCXKQI2/lF1uZ7Hond+3YhQFZ4LWOzVy1fA//HGoHXFlhFQVngL8rdB +lRofzF2OqyCWuklc+1noDTG2ORL33kFLNvrhWDLekL3gKEjuaZnrX1Z2 4=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAAqvWxZ/4cNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm8+LWSBFAeOBJFflgSCESEBCoUbAoNzPxgBAgEBAQEBAQFrKIU?= =?us-ascii?q?YAQEBAQMBAStBCxACAQgOAwQBASgHJwsUCQgCBAENBQgTiTBkELFEixQBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBAQEYBYMog02FBYUghT4FilCMcodyAosSiHmSOJVWAR8?= =?us-ascii?q?4gQp1FUmHFnYBh36BDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,374,1496102400"; d="scan'208,217";a="271023904" Received: from alln-core-2.cisco.com ([173.36.13.135]) by rcdn-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 17 Jul 2017 13:36:57 +0000 Received: from XCH-RTP-006.cisco.com (xch-rtp-006.cisco.com [64.101.220.146]) by alln-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id v6HDauUb028062 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 17 Jul 2017 13:36:57 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-006.cisco.com (64.101.220.146) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 09:36:56 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 09:36:56 -0400 From: "Kent Leung (kleung)" To: Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEA== Date: Mon, 17 Jul 2017 13:36:56 +0000 Message-ID: <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.39.71] Content-Type: multipart/alternative; boundary="_000_99da3de545b142f5b9400f808f418fa1XCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 13:37:00 -0000 --_000_99da3de545b142f5b9400f808f418fa1XCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Why can't there be stats for per SPI and more granular stats for per SPI/SI= ? They seem to serve different purposes. The former is providing counters f= or all flows in each service path. The latter is provide counters for all f= lows served at each hop in the service path. Can you explain the "spiral" scenario and how that pertains to usefulness o= f having per service path stats? Thanks. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 3:01 PM To: Roberta Maglione (robmgl) ; James N Guichard Cc: Kent Leung (kleung) ; sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_99da3de545b142f5b9400f808f418fa1XCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Why can’t there be stats for per SPI and more granular stats fo= r per SPI/SI? They seem to serve different purposes. The former is providin= g counters for all flows in each service path. The latter is provide counters for all flows served at each hop in the ser= vice path.

 

Can you explain the “spiral” scenario an= d how that pertains to usefulness of having per service path stats? Thanks.=

 

Kent

 

 

From: Dave Dolson [mailto:ddolson@sandvine.co= m]
Sent: Monday, July 17, 2017 3:01 PM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; James N Guic= hard <james.n.guichard@huawei.com>
Cc: Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Strictly, stats should= be per SPI and SI, in order to support the so-called spiral.

But I can see how folk= s might find the lazy implementation to be useful.

 

From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspect: having different = SPI's for each direction simplifies the troubleshooting procedures, as stat= istics on the packets counters for each direction on each SF, can be displa= yed just based on SPI.

Regards,

Roberta 

Inviato da iPad


Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@= ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

_______________________________________________<= br> sfc mailing list
sfc@ietf.org
https://ww= w.ietf.org/mailman/listinfo/sfc

--_000_99da3de545b142f5b9400f808f418fa1XCHRTP006ciscocom_-- From nobody Mon Jul 17 06:41:06 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AA267131BD3 for ; Mon, 17 Jul 2017 06:41:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L7aE_hHWKGW6 for ; Mon, 17 Jul 2017 06:41:04 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3CBBD131BCA for ; Mon, 17 Jul 2017 06:41:04 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Mon, 17 Jul 2017 09:41:02 -0400 From: Kyle Larose To: "Kent Leung (kleung)" , "sfc@ietf.org" Thread-Topic: forwarding clarification on draft-ietf-sfc-offloads Thread-Index: AdL+/slMp3raszYyTAW95QvwYpmusQAA2K2Q Date: Mon, 17 Jul 2017 13:41:01 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.30.10.196] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_D76BBBCF97F57144BB5FCF08007244A7A9018071wtlexchp2sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] forwarding clarification on draft-ietf-sfc-offloads X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 13:41:05 -0000 --_000_D76BBBCF97F57144BB5FCF08007244A7A9018071wtlexchp2sandvi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable What if the SFF had a hidden "virtual" SF located inside it? Or is that str= etching things too much... From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Monday, July 17, 2017 6:59 PM To: sfc@ietf.org Subject: [sfc] forwarding clarification on draft-ietf-sfc-offloads Hi. The draft-ietf-sfc-offloads describes bypassing SF for flow offload. Sk= ipping a hop requires service index (SI) to be decremented by SFF. But thi= s is not covered in the draft. Currently, SFC architecture is based on SFF = forwarding based on service path ID and SI (which is only decremented by SF= or SFC Proxy). draft-ietf-sfc-nsh: Service Index (SI): provides location within the SFP. The initial classifier for a given SFP SHOULD set the SI to 255, however the control plane MAY configure the initial value of SI as appropriate (i.e., taking into account the length of the service function path). Service Index MUST be decremented by a value of 1 by Service Functions or by SFC Proxy nodes after performing required services and the new decremented SI value MUST be used in the egress NSH packet. Should the draft be updated with description on how the flow is forwarded t= hrough the service path? Should SFF decrement the SI? Or some other method = to support offload? Kent --_000_D76BBBCF97F57144BB5FCF08007244A7A9018071wtlexchp2sandvi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

What if the SFF had a = hidden “virtual” SF located inside it? Or is that stretching th= ings too much…

 

From: sfc [mai= lto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Monday, July 17, 2017 6:59 PM
To: sfc@ietf.org
Subject: [sfc] forwarding clarification on draft-ietf-sfc-offloads

 

Hi. The draft-ietf-sfc-offloads describes bypassing = SF for flow offload. Skipping a hop requires service index (SI) to be decre= mented by SFF.  But this is not covered in the draft. Currently, SFC a= rchitecture is based on SFF forwarding based on service path ID and SI (which is only decremented by SF or SFC Pr= oxy).

 

draft-ietf-sfc-nsh:

 

Service Index (SI): provides location within the SFP= .  The initial

   classifier for a given SFP SHOULD set t= he SI to 255, however the

   control plane MAY configure the initial= value of SI as appropriate

   (i.e., taking into account the length o= f the service function path).

   Service Index MUST be decremented by a = value of 1 by Service

   Functions or by SFC Proxy nodes after p= erforming required services

   and the new decremented SI value MUST b= e used in the egress NSH

   packet.

 

Should the draft be updated with description on how = the flow is forwarded through the service path? Should SFF decrement the SI= ? Or some other method to support offload?

 

Kent

 

--_000_D76BBBCF97F57144BB5FCF08007244A7A9018071wtlexchp2sandvi_-- From nobody Mon Jul 17 06:48:34 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E44A131B5D for ; Mon, 17 Jul 2017 06:48:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fkKX14e-Sbx6 for ; Mon, 17 Jul 2017 06:48:30 -0700 (PDT) Received: from alln-iport-7.cisco.com (alln-iport-7.cisco.com [173.37.142.94]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9B1A812ECEF for ; Mon, 17 Jul 2017 06:48:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9319; q=dns/txt; s=iport; t=1500299310; x=1501508910; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=B9CEFVMA69RBsGEG3xiLb/DEUPOtU1g+qGUOgZA6RpQ=; b=cVvGE1Wy9expiE9d3H4xxtxNaso0g1dKOOHWQD6jAlyN1Zfavss9VAdY bJ44lza8VYhEPmQkeTUxOhqbpreeUL125+sm52R8ZyEPOD+D5hbsWsJ2h uKPM42fc4GwXYG8j3zQf48cdeM76JdFMkXyOhB+BGJTZjxZYa4xgKvKsD U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DiAAC9v2xZ/4MNJK1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBgm8+LWSBFAeOBJFfkFiFLIIRhUcCg2Q/GAECAQEBAQEBAWsohRgBAQE?= =?us-ascii?q?BAy1cAgEIDgMBAwEBFhIHMhQDBggBAQQBEgiJQ2SxYIsUAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBHYMog02BYYMkhSAJhTUFilCMcodyApQLghWFT4pUlVYBHziBCnU?= =?us-ascii?q?Vh192h3+BDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,374,1496102400"; d="scan'208,217";a="456787758" Received: from alln-core-1.cisco.com ([173.36.13.131]) by alln-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 17 Jul 2017 13:48:29 +0000 Received: from XCH-RTP-006.cisco.com (xch-rtp-006.cisco.com [64.101.220.146]) by alln-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v6HDmTjG028314 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 17 Jul 2017 13:48:29 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-006.cisco.com (64.101.220.146) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 09:48:28 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 09:48:28 -0400 From: "Kent Leung (kleung)" To: Kyle Larose , "sfc@ietf.org" Thread-Topic: forwarding clarification on draft-ietf-sfc-offloads Thread-Index: AdL+/slMp3raszYyTAW95QvwYpmusQAA2K2QAAAO7BA= Date: Mon, 17 Jul 2017 13:48:28 +0000 Message-ID: <11416aae74eb40bc8e7318bf2720f341@XCH-RTP-006.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.39.71] Content-Type: multipart/alternative; boundary="_000_11416aae74eb40bc8e7318bf2720f341XCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] forwarding clarification on draft-ietf-sfc-offloads X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 13:48:32 -0000 --_000_11416aae74eb40bc8e7318bf2720f341XCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Kyle. I personally think that's not stretching too much. Actually, there= are various use cases that would require a "virtual SF" like function in S= FF. Please see draft-wang-sfc-receive-only as one of the use cases. In that= draft, the "Extended SFC Proxy" is performing the SI decrement and packet = copy. This function is typically collocated in SFF. So I like your thought = process ... :) Kent From: Kyle Larose [mailto:klarose@sandvine.com] Sent: Monday, July 17, 2017 3:41 PM To: Kent Leung (kleung) ; sfc@ietf.org Subject: RE: forwarding clarification on draft-ietf-sfc-offloads What if the SFF had a hidden "virtual" SF located inside it? Or is that str= etching things too much... From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Monday, July 17, 2017 6:59 PM To: sfc@ietf.org Subject: [sfc] forwarding clarification on draft-ietf-sfc-offloads Hi. The draft-ietf-sfc-offloads describes bypassing SF for flow offload. Sk= ipping a hop requires service index (SI) to be decremented by SFF. But thi= s is not covered in the draft. Currently, SFC architecture is based on SFF = forwarding based on service path ID and SI (which is only decremented by SF= or SFC Proxy). draft-ietf-sfc-nsh: Service Index (SI): provides location within the SFP. The initial classifier for a given SFP SHOULD set the SI to 255, however the control plane MAY configure the initial value of SI as appropriate (i.e., taking into account the length of the service function path). Service Index MUST be decremented by a value of 1 by Service Functions or by SFC Proxy nodes after performing required services and the new decremented SI value MUST be used in the egress NSH packet. Should the draft be updated with description on how the flow is forwarded t= hrough the service path? Should SFF decrement the SI? Or some other method = to support offload? Kent --_000_11416aae74eb40bc8e7318bf2720f341XCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Kyle. I personally think that’s not stretching too much. Act= ually, there are various use cases that would require a “virtual SF&#= 8221; like function in SFF. Please see draft-wang-sfc-receive-only as one of the use cases. In that draft, the “Extended SFC Proxy̶= 1; is performing the SI decrement and packet copy. This function is typical= ly collocated in SFF. So I like your thought process … J

 

Kent

 

 

From: Kyle Larose [mailto:klarose@sandvine.co= m]
Sent: Monday, July 17, 2017 3:41 PM
To: Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: forwarding clarification on draft-ietf-sfc-offloads

 

What if the SFF had a = hidden “virtual” SF located inside it? Or is that stretching th= ings too much…

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Monday, July 17, 2017 6:59 PM
To: sfc@ietf.org
Subject: [sfc] forwarding clarification on draft-ietf-sfc-offloads

 

Hi. The draft-ietf-sfc-offloads describes bypassing = SF for flow offload. Skipping a hop requires service index (SI) to be decre= mented by SFF.  But this is not covered in the draft. Currently, SFC a= rchitecture is based on SFF forwarding based on service path ID and SI (which is only decremented by SF or SFC Pr= oxy).

 

draft-ietf-sfc-nsh:

 

Service Index (SI): provides location within the SFP= .  The initial

   classifier for a given SFP SHOULD set t= he SI to 255, however the

   control plane MAY configure the initial= value of SI as appropriate

   (i.e., taking into account the length o= f the service function path).

   Service Index MUST be decremented by a = value of 1 by Service

   Functions or by SFC Proxy nodes after p= erforming required services

   and the new decremented SI value MUST b= e used in the egress NSH

   packet.

 

Should the draft be updated with description on how = the flow is forwarded through the service path? Should SFF decrement the SI= ? Or some other method to support offload?

 

Kent

 

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yhulMvPd9p74 for ; Mon, 17 Jul 2017 07:48:20 -0700 (PDT) Received: from mail.santannapisa.it (mail.santannapisa.it [193.205.80.98]) by ietfa.amsl.com (Postfix) with ESMTP id BC85A131C07 for ; Mon, 17 Jul 2017 07:48:19 -0700 (PDT) Received: from [10.30.2.210] ([10.30.2.210] verified) by santannapisa.it (CommuniGate Pro SMTP 6.1.11) with ESMTP id 122643350 for sfc@ietf.org; Mon, 17 Jul 2017 16:48:12 +0200 To: sfc@ietf.org From: Barbara Martini Message-ID: Date: Mon, 17 Jul 2017 16:48:14 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------4179211C6B4B4D900F4E9ABC" Archived-At: Subject: [sfc] CFP - Deadline extended to July 31st - The 3rd IEEE Workshop on Orchestration for Software-Defined Infrastructures (O4SDI) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 14:48:22 -0000 This is a multi-part message in MIME format. --------------4179211C6B4B4D900F4E9ABC Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Please accept our apologies if you receive multiple copies of this CFP ************************************************************************ 3rd IEEE Workshop on Orchestration for Software-Defined Infrastructures (O4SDI) http://o4sdi.unibo.it/o4sdi3 http://edas.info/N23770 To be held in conjunction with the 2017 IEEE Conference on Network Function Virtualization and Software Defined Networks (IEEE NFV-SDN 2017) 6th November 2017 // Berlin, Germany ************************************************************************ The current industry trend of convergence between computing and networking eco-systems clearly shows that software will play an unprecedented dominant role also in future communication environments. Computing, storage, and connectivity services, as well as any other present and future application instances, will be deployed in the form of virtualized assets within a software-defined infrastructure running on top of general-purpose processing and communication hardware, all managed and made available under the cloud “As A Service†paradigm. This technological convergence and infrastructure sharing between the computing and communication systems portend a scenario with a “fog†of micro-clouds composed of generalized virtual functions providing both applications and network services that supplement those deployed in traditional cloud datacenters. The Third IEEE Workshop on Orchestration for Software-Defined Infrastructures (O4SDI) addresses the challenges that will facilitate orchestration and programmability of generalized virtual functions in Software Defined Infrastructures (SDI), enabling cloud and network providers to deploy integrated services across different resource domains. Orchestration mechanisms will facilitate the live deployment and lifecycle management of these virtual elements, at the application level, the server level, and the network level within a single domain and across multiple domains. Without such orchestration it will not be possible to enable dynamic establishment of generalized virtual functions chains, according to service requirements. These challenges of orchestration are many-fold, with many open questions that need to be addressed in the areas of: - network "softwarization" which requires unified management of computing, storage, and network resources for the effective deployment, lifecycle management, and run-time configuration of generalized virtual functions; - abstraction models and open standard interfaces, needed for assuring vendor interoperability; - adaptation and optimization mechanisms, which must be enforced at global and/or local level for coping with user demand, application requirements, resource unavailability, etc. O4SDI aims at providing an international forum for researchers and practitioners from academia, industry, network operators, and service providers to discuss and address the challenges deriving from such emerging scenario where systems, processes, and workflows used in both computing and communications domains are converging. The workshop welcomes contributions from both computing and network-oriented research communities, with the aim of facilitating discussion, cross-fertilization and exchange of ideas and practices, and successfully promote innovative solutions toward a real programmatic use of software-defined infrastructures as a whole. Contributions that discuss lessons learnt and best practices, describe practical deployment and implementation experiences, and demonstrate innovative use-cases are especially encouraged for presentation and publication. We are particularly interested in papers that cover, but are not limited to, the following topics: - single domain and cross domain orchestration issues - integrated network and computing resource control and management - control and abstraction of heterogeneous networks - orchestration in SDN/NFV - run-time orchestration - orchestration for next-generation IP and optical networks - orchestration in 5G networks - QoS/QoE in software-defined infrastructures - orchestration for high-availability and resilience in software-defined infrastructures - intent-based orchestration - orchestration for fog computing and networking - dynamic service composition and delivery - network programmability for service chaining - orchestration of network slices and data center slices - software engineering and operating systems techniques applied to orchestration - description, specification, and abstraction languages for orchestration - optimal orchestration algorithms - context-aware orchestration - functional architectures of orchestrating elements - testbed experiments on orchestrations - performance evaluation of orchestration elements - standardization issues in orchestration - best practices in orchestration - cloudified mobile networks - softwarized platforms for verticals Important Dates - Workshop Paper Submission: July 31, 2017 (EXTENDED) - Notification of Acceptance: August 31, 2017 - Camera-ready Submission: September 15, 2017 Paper submissions will be handled on-line through the EDAS system. Submission link: http://edas.info/N23770 Prospective authors are invited to submit high-quality, original technical papers for presentation at the workshop and publication in the O4SDI Proceedings and IEEE Xplore. Papers must be written in English, unpublished and not submitted elsewhere. Full papers must be formatted as the standard IEEE double-column conference template. All final submissions should have a maximum paper length of six (6) printed pages (10-point font), including figures, without incurring additional page charges. Workshop Co-Chairs - Stuart Clayman, University College London, UK - s.clayman@ucl.ac.uk - Walter Cerroni, University of Bologna, Italy - walter.cerroni@unibo.it - Barbara Martini, CNIT, Pisa, Italy - barbara.martini@cnit.it - Federica Paganelli, CNIT, Firenze, Italy - federica.paganelli@cnit.it Technical Program Committee - Carlos Bernardos, Universidad Carlos III de Madrid, Spain - Giuseppe Bianchi, University of Rome Tor Vergata, Italy - Amina Boubendir, Orange Labs, France - Hakki Cankaya, Fujitsu Network Communications, USA - Ramon Casellas, CTTC, Spain - Maurizio Casoni, University of Modena and Reggio Emilia, Italy - Piero Castoldi, Scuola Superiore Sant’Anna, Italy - Prosper Chemouil, Orange Labs, France - Chiara Contoli, University of Bologna, Italy - Luca Foschini, University of Bologna, Italy - Molka Gharbaoui, Scuola Superiore Sant’Anna, Itally - Riccardo Guerzoni, DOCOMO Euro-labs, Germany - Vatche Ishakian, Bentley University, USA - Lefteris Mamatas, University of Macedonia, Greece - Catalin Meirosu, Ericsson Research, Sweden - Paolo Monti, KTH Royal Institute of Technology, Sweden - Jordi Ortiz, University of Murcia, Spain - Fulvio Risso, Politecnico di Torino, Italy - Javier Rubio-Loyola, CINVESTAV Tamaulipas, Mexico - Stefano Secci, University Pierre et Marie Curie, France - Joan Serrat, Universitat Politècnica de Catalunya, Spain - Antonio Fernando Skarmeta Gomez, University of Murcia, Spain - Mauro Tortonesi, University of Ferrara, Italy - Daphne Tuncer, University College London, UK - Ishan Vaishnavi, Huawei Technologies Dusseldorf GmBH, Germany - Mohammed Faten Zhani, Ecole de Technologie Superieure, University of Quebec, Canada --------------4179211C6B4B4D900F4E9ABC Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Please accept our apologies if you receive multiple copies of this CFP

************************************************************************

                          3rd IEEE Workshop on
       Orchestration for Software-Defined Infrastructures (O4SDI)

                      http://o4sdi.unibo.it/o4sdi3

                         http://edas.info/N23770

       To be held in conjunction with the 2017 IEEE Conference on
     Network Function Virtualization and Software Defined Networks
                          (IEEE NFV-SDN 2017)
                  6th November 2017 // Berlin, Germany

************************************************************************

The  current  industry  trend   of  convergence  between  computing  and
networking  eco-systems  clearly  shows   that  software  will  play  an
unprecedented    dominant   role    also    in   future    communication
environments. Computing, storage, and  connectivity services, as well as
any other present and future  application instances, will be deployed in
the form of virtualized  assets within a software-defined infrastructure
running on top of general-purpose processing and communication hardware,
all  managed  and  made  available   under  the  cloud  “As  A  Serviceâ€
paradigm.  This  technological  convergence and  infrastructure  sharing
between the computing and communication  systems portend a scenario with
a  “fogâ€Â  of  micro-clouds  composed of  generalized  virtual  functions
providing both  applications and network services  that supplement those
deployed in traditional cloud datacenters.

The   Third  IEEE   Workshop  on   Orchestration  for   Software-Defined
Infrastructures (O4SDI)  addresses the  challenges that  will facilitate
orchestration and  programmability of  generalized virtual  functions in
Software  Defined  Infrastructures  (SDI), enabling  cloud  and  network
providers  to  deploy  integrated  services  across  different  resource
domains. Orchestration  mechanisms will  facilitate the  live deployment
and lifecycle management  of these virtual elements,  at the application
level, the  server level, and the  network level within a  single domain
and across multiple  domains. Without such orchestration it  will not be
possible  to   enable  dynamic  establishment  of   generalized  virtual
functions chains, according to service requirements.

These  challenges  of  orchestration   are  many-fold,  with  many  open
questions that need to be addressed in the areas of:

-  network   "softwarization"  which  requires  unified   management  of
   computing,  storage,   and  network   resources  for   the  effective
   deployment,  lifecycle  management,  and  run-time  configuration  of
   generalized virtual functions;

-  abstraction models  and open standard interfaces,  needed for assuring
   vendor interoperability;

-  adaptation and  optimization mechanisms,  which must  be enforced  at
   global and/or  local level for  coping with user  demand, application
   requirements, resource unavailability, etc.

O4SDI  aims at  providing  an international  forum  for researchers  and
practitioners from  academia, industry,  network operators,  and service
providers  to discuss  and  address the  challenges  deriving from  such
emerging scenario where  systems, processes, and workflows  used in both
computing  and  communications  domains  are  converging.  The  workshop
welcomes contributions from both computing and network-oriented research
communities,    with    the     aim    of    facilitating    discussion,
cross-fertilization   and  exchange   of   ideas   and  practices,   and
successfully promote innovative solutions toward a real programmatic use
of  software-defined  infrastructures  as a  whole.  Contributions  that
discuss lessons learnt and best practices, describe practical deployment
and implementation experiences, and demonstrate innovative use-cases are
especially encouraged for presentation and publication.

We are particularly interested in papers that cover, but are not limited
to, the following topics:

-  single domain and cross domain orchestration issues
-  integrated network and computing resource control and management
-  control and abstraction of heterogeneous networks
-  orchestration in SDN/NFV
-  run-time orchestration
-  orchestration for next-generation IP and optical networks
-  orchestration in 5G networks
-  QoS/QoE in software-defined infrastructures
-  orchestration for high-availability and resilience in
   software-defined infrastructures
-  intent-based orchestration
-  orchestration for fog computing and networking
-  dynamic service composition and delivery
-  network programmability for service chaining
-  orchestration of network slices and data center slices
-  software engineering and operating systems techniques applied
   to orchestration
-  description, specification, and abstraction languages for
   orchestration
-  optimal orchestration algorithms
-  context-aware orchestration
-  functional architectures of orchestrating elements
-  testbed experiments on orchestrations
-  performance evaluation of orchestration elements
-  standardization issues in orchestration
-  best practices in orchestration
- cloudified mobile networks
- softwarized platforms for verticals

Important Dates

- Workshop Paper Submission: July 31, 2017 (EXTENDED)
- Notification of Acceptance: August 31, 2017
- Camera-ready Submission: September 15, 2017


Paper submissions will be handled on-line through the EDAS system.

Submission link: http://edas.info/N23770

Prospective  authors  are  invited   to  submit  high-quality,  original
technical papers for presentation at the workshop and publication in the
O4SDI Proceedings  and IEEE Xplore.  Papers must be written  in English,
unpublished and not  submitted elsewhere. Full papers  must be formatted
as  the  standard  IEEE  double-column conference  template.  All  final
submissions should have a maximum paper  length of six (6) printed pages
(10-point font),  including figures,  without incurring  additional page
charges.


Workshop Co-Chairs

- Stuart Clayman, University College London, UK - s.clayman@ucl.ac.uk
- Walter Cerroni, University of Bologna, Italy - walter.cerroni@unibo.it
- Barbara Martini, CNIT, Pisa, Italy - barbara.martini@cnit.it
- Federica Paganelli, CNIT, Firenze, Italy - federica.paganelli@cnit.it


Technical Program Committee

- Carlos Bernardos, Universidad Carlos III de Madrid, Spain
- Giuseppe Bianchi, University of Rome Tor Vergata, Italy
- Amina Boubendir, Orange Labs, France
- Hakki Cankaya, Fujitsu Network Communications, USA
- Ramon Casellas, CTTC, Spain
- Maurizio Casoni, University of Modena and Reggio Emilia, Italy
- Piero Castoldi, Scuola Superiore Sant’Anna, Italy
- Prosper Chemouil, Orange Labs, France
- Chiara Contoli, University of Bologna, Italy
- Luca Foschini, University of Bologna, Italy
- Molka Gharbaoui, Scuola Superiore Sant’Anna, Itally
- Riccardo Guerzoni, DOCOMO Euro-labs, Germany
- Vatche Ishakian, Bentley University, USA
- Lefteris Mamatas, University of Macedonia, Greece
- Catalin Meirosu, Ericsson Research, Sweden
- Paolo Monti, KTH Royal Institute of Technology, Sweden
- Jordi Ortiz, University of Murcia, Spain
- Fulvio Risso, Politecnico di Torino, Italy
- Javier Rubio-Loyola, CINVESTAV Tamaulipas, Mexico
- Stefano Secci, University Pierre et Marie Curie, France
- Joan Serrat, Universitat Politècnica de Catalunya, Spain
- Antonio Fernando Skarmeta Gomez, University of Murcia, Spain
- Mauro Tortonesi, University of Ferrara, Italy
- Daphne Tuncer, University College London, UK
- Ishan Vaishnavi, Huawei Technologies Dusseldorf GmBH, Germany
- Mohammed Faten Zhani, Ecole de Technologie Superieure, University of Quebec, Canada

--------------4179211C6B4B4D900F4E9ABC-- From nobody Mon Jul 17 09:16:27 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4E21F12711E for ; Mon, 17 Jul 2017 09:16:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pbh21dMv8XG3 for ; Mon, 17 Jul 2017 09:16:19 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9F8FC131C71 for ; Mon, 17 Jul 2017 09:16:18 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Mon, 17 Jul 2017 12:16:16 -0400 From: Dave Dolson To: "Kent Leung (kleung)" , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAFyo0Q Date: Mon, 17 Jul 2017 16:16:16 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> In-Reply-To: <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [31.133.142.50] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_E8355113905631478EFF04F5AA706E98A906571Awtlexchp2sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 16:16:21 -0000 --_000_E8355113905631478EFF04F5AA706E98A906571Awtlexchp2sandvi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable "Spiral" means a path can traverse the same SF twice. E.g., you might do "before" and "after" policies from the same SF device. From: Kent Leung (kleung) [mailto:kleung@cisco.com] Sent: Monday, July 17, 2017 3:37 PM To: Dave Dolson; Roberta Maglione (robmgl); James N Guichard Cc: sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Why can't there be stats for per SPI and more granular stats for per SPI/SI= ? They seem to serve different purposes. The former is providing counters f= or all flows in each service path. The latter is provide counters for all f= lows served at each hop in the service path. Can you explain the "spiral" scenario and how that pertains to usefulness o= f having per service path stats? Thanks. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 3:01 PM To: Roberta Maglione (robmgl) ; James N Guichard Cc: Kent Leung (kleung) ; sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_E8355113905631478EFF04F5AA706E98A906571Awtlexchp2sandvi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

“Spiral” m= eans a path can traverse the same SF twice.

E.g., you might do = 220;before” and “after” policies from the same SF device.=

 

 

 

From: Kent Leu= ng (kleung) [mailto:kleung@cisco.com]
Sent: Monday, July 17, 2017 3:37 PM
To: Dave Dolson; Roberta Maglione (robmgl); James N Guichard
Cc: sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Why can’t there be stats for per SPI and more granular stats fo= r per SPI/SI? They seem to serve different purposes. The former is providin= g counters for all flows in each service path. The latter is provide counters for all flows served at each hop in the ser= vice path.

 

Can you explain the &#= 8220;spiral” scenario and how that pertains to usefulness of having p= er service path stats? Thanks.

 

Kent=

 

 

From: Dave Dolson [mailto:ddolson@sandvine.co= m]
Sent: Monday, July 17, 2017 3:01 PM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; James N Guic= hard <james.n.guichard@huawei.com>
Cc: Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Strictly, stats should= be per SPI and SI, in order to support the so-called spiral.

But I can see how folk= s might find the lazy implementation to be useful.

 

From: Roberta = Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspect: having different = SPI's for each direction simplifies the troubleshooting procedures, as stat= istics on the packets counters for each direction on each SF, can be displa= yed just based on SPI.

Regards,

Roberta 

Inviato da iPad


Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@= ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

____________________________________= ___________
sfc mailing list
sfc@ietf.org<= /a>
=

--_000_E8355113905631478EFF04F5AA706E98A906571Awtlexchp2sandvi_-- From nobody Mon Jul 17 09:18:08 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B782131C91 for ; Mon, 17 Jul 2017 09:18:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eaouy5ZJm9gy for ; Mon, 17 Jul 2017 09:18:06 -0700 (PDT) Received: from mail-qt0-x235.google.com (mail-qt0-x235.google.com [IPv6:2607:f8b0:400d:c0d::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 03753131C71 for ; Mon, 17 Jul 2017 09:18:06 -0700 (PDT) Received: by mail-qt0-x235.google.com with SMTP id 32so110306917qtv.1 for ; Mon, 17 Jul 2017 09:18:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=pXxlRd3XGOBBveVVxCSZGoXF1hGFyWG+ZxAt2YozSbk=; b=j+P5gi7CAac5oa9EBOBlippxluJ6vaj+NrkXLwQv2myAdthSlLxcrjmgvjgq8VLBoA EwaNyjfuJmyH3guKJ56EzEYDyAWtcNWcnzAabTaTmk7PV4WsFWtNR9J77UoF7IusdHDj YiA1PVWd2RKAAPYmYZDcAdG3rtE3UScpXOC+uW35GcQmLKUOBkbkaqNQjn4PUSO+a/pi BWHcO1yQXwKtwwOcseJroFYvmWLefIFrWna/hb4DxpUzFoSXbIIOWNMGznUENrPkpPWi b6GfNKMNULyQecrJyFYmmcqEMEevksW6I70u9YJz+ctOQW6WuAcfL8r3XoREvrqyDwce u4XA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=pXxlRd3XGOBBveVVxCSZGoXF1hGFyWG+ZxAt2YozSbk=; b=LVzX5Nbn9rsLW1pOF/i6BMtFpbp5O2E6wlGCvucUybk0UEi+2NDs58GRlPE/gq9rvo 5U94gSnhm1uxQyOOIw7OZBETra1B3UuPO/twGHEhIgw/V//EGFbJT8S/jxn5UZ0r/MaW VEUTU4pR2ykgrrMP+Mx0Cb7GOOKlSePYSSHSX+BgtEkJq5Jg9zjbpsKcI7Xb0a3PTaie YQ7nLsUTyexAd36FLTcAwEzeJLgm9TZPqyLv5ONHPuqGUAt+S6DGZLx6tlQ12G9Sj1BQ uX5yXMbjm/NLz3Wzdpt6akyrzzF68OcKAslVIhRQ89Kdz0R0ey3Y2kEudbNm0PGH+JM9 7dxA== X-Gm-Message-State: AIVw113fHZz14NcribgIkTu17woiGOOfmyA2wcEw6aTsO/pfzwT+Dc6l nBZwp0SHW1DEMdMzWiyeVNwx1mXpCmRU X-Received: by 10.200.57.225 with SMTP id v88mr30809196qte.50.1500308284739; Mon, 17 Jul 2017 09:18:04 -0700 (PDT) MIME-Version: 1.0 Received: by 10.140.22.227 with HTTP; Mon, 17 Jul 2017 09:18:04 -0700 (PDT) From: Greg Mirsky Date: Mon, 17 Jul 2017 09:18:04 -0700 Message-ID: To: sfc@ietf.org Content-Type: multipart/alternative; boundary="94eb2c1229c45d9635055485bef3" Archived-At: Subject: [sfc] The scope of SFC OAM Framework draft X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 16:18:07 -0000 --94eb2c1229c45d9635055485bef3 Content-Type: text/plain; charset="UTF-8" Dear All, the last sentence of the short section in the SFC OAM Framework draft is what I've referred to when proposing to remove sections 5 and 6 from the document: 1.1 . Document Scope The focus of this document is to provide an architectural framework for SFC OAM, particularly focused on the aspect of the Operations component within OAM. Actual solutions and mechanisms are outside the scope of this document. Regards, Greg --94eb2c1229c45d9635055485bef3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear All,
the last sentence of the short section in th= e SFC OAM Framework draft is what I've referred to when proposing to re= move sections 5 and 6 from the document:
1.1.  Document Scope


   The focus of this document is to provide an architectural framework
   for SFC OAM, particularly focused on the aspect of the Operations
   component within OAM.  Actual solutions and mechanisms are outside
   the scope of this document.

<=
/pre>
Regards,
Greg
--94eb2c1229c45d9635055485bef3-- From nobody Mon Jul 17 09:20:59 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 41A8A131C8F for ; Mon, 17 Jul 2017 09:20:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id okGHVKAK9ry2 for ; Mon, 17 Jul 2017 09:20:55 -0700 (PDT) Received: from alln-iport-4.cisco.com (alln-iport-4.cisco.com [173.37.142.91]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 760D8131C9C for ; Mon, 17 Jul 2017 09:20:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=24889; q=dns/txt; s=iport; t=1500308455; x=1501518055; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=O0D7T1g/gfLd8CVQkiR+cP4J2fkA6p5IemyHS3jnkjE=; b=eFZ4I9ozjv/zfip4PD4jQ6nhkzjanlAzVzqDinN/6BRnqmC4HUi3KcdL d/gNmpgC65PG6RINCfmkFaVEVOAgSek+5T+FDLWGS3nOPX2uKmJKYnukh z583QMxjoYC4gvpXhhNdl6xVcwzpWgCTATM/dfS6lDEwM/0mx46DMHTXA s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAB34mxZ/4MNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm8+LWSBFAeOBJFglgSCESEBCoUbAoNEPxgBAgEBAQEBAQFrKIU?= =?us-ascii?q?YAQEBAQMBAStBCxACAQgOAwQBASEHBycLFAkIAgQBDQUIE4kwZBCxY4sDAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBAQEBGAWDKINNhQWFIIU+BYpQjHKHcgKLEoh5kjiVVgE?= =?us-ascii?q?fOIEKdRVJhxZ2AYd+gQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.40,375,1496102400"; d="scan'208,217";a="454718017" Received: from alln-core-1.cisco.com ([173.36.13.131]) by alln-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 17 Jul 2017 16:20:53 +0000 Received: from XCH-RTP-006.cisco.com (xch-rtp-006.cisco.com [64.101.220.146]) by alln-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v6HGKrem014145 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 17 Jul 2017 16:20:54 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-006.cisco.com (64.101.220.146) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 17 Jul 2017 12:20:53 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Mon, 17 Jul 2017 12:20:53 -0400 From: "Kent Leung (kleung)" To: Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAFyo0QAAACz6A= Date: Mon, 17 Jul 2017 16:20:52 +0000 Message-ID: <54c9fcda98e44cf6adfb8d6068c65ecb@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.39.71] Content-Type: multipart/alternative; boundary="_000_54c9fcda98e44cf6adfb8d6068c65ecbXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 16:20:58 -0000 --_000_54c9fcda98e44cf6adfb8d6068c65ecbXCHRTP006ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks for clarifying the term. So the flow is going through the service pa= th once, but re-enters the same SF in transit. In that case, the counter fo= r the service path and counter for each hop would still be helpful. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 6:16 PM To: Kent Leung (kleung) ; Roberta Maglione (robmgl) ; James N Guichard Cc: sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket "Spiral" means a path can traverse the same SF twice. E.g., you might do "before" and "after" policies from the same SF device. From: Kent Leung (kleung) [mailto:kleung@cisco.com] Sent: Monday, July 17, 2017 3:37 PM To: Dave Dolson; Roberta Maglione (robmgl); James N Guichard Cc: sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Why can't there be stats for per SPI and more granular stats for per SPI/SI= ? They seem to serve different purposes. The former is providing counters f= or all flows in each service path. The latter is provide counters for all f= lows served at each hop in the service path. Can you explain the "spiral" scenario and how that pertains to usefulness o= f having per service path stats? Thanks. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 3:01 PM To: Roberta Maglione (robmgl) >; = James N Guichard > Cc: Kent Leung (kleung) >; sfc@ie= tf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_54c9fcda98e44cf6adfb8d6068c65ecbXCHRTP006ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks for clarifying the term. So the flow is going through the serv= ice path once, but re-enters the same SF in transit. In that case, the coun= ter for the service path and counter for each hop would still be helpful.

 

Kent

 

 

From: Dave Dolson [mailto:ddolson@sandvine.co= m]
Sent: Monday, July 17, 2017 6:16 PM
To: Kent Leung (kleung) <kleung@cisco.com>; Roberta Maglione (= robmgl) <robmgl@cisco.com>; James N Guichard <james.n.guichard@hua= wei.com>
Cc: sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

“Spiral” m= eans a path can traverse the same SF twice.

E.g., you might do = 220;before” and “after” policies from the same SF device.=

 

 

 

From: Kent Leung (kleung) [mailto:kleung@cisco.com]
Sent: Monday, July 17, 2017 3:37 PM
To: Dave Dolson; Roberta Maglione (robmgl); James N Guichard
Cc: sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Why can’t there = be stats for per SPI and more granular stats for per SPI/SI? They seem to s= erve different purposes. The former is providing counters for all flows in = each service path. The latter is provide counters for all flows served at each hop in the service path.

 

Can you explain the &#= 8220;spiral” scenario and how that pertains to usefulness of having p= er service path stats? Thanks.

 

Kent=

 

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Monday, July 17, 2017 3:01 PM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; James N Guichard <james.n.guichard@huawei.com>
Cc: Kent Leung (kleung) <kleu= ng@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Strictly, stats should= be per SPI and SI, in order to support the so-called spiral.

But I can see how folk= s might find the lazy implementation to be useful.

 

From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspect: having different = SPI's for each direction simplifies the troubleshooting procedures, as stat= istics on the packets counters for each direction on each SF, can be displa= yed just based on SPI.

Regards,

Roberta 

Inviato da iPad


Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@= ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

_______________________________________________<= br> sfc mailing list
sfc@ietf.org
https://ww= w.ietf.org/mailman/listinfo/sfc

--_000_54c9fcda98e44cf6adfb8d6068c65ecbXCHRTP006ciscocom_-- From nobody Tue Jul 18 00:52:18 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2CA3B12ECF0 for ; Tue, 18 Jul 2017 00:52:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WbpRYB56BjEL for ; Tue, 18 Jul 2017 00:52:05 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C5F8C131A4F for ; Tue, 18 Jul 2017 00:52:04 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I7q2GP015928 for ; Tue, 18 Jul 2017 08:52:02 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I7q0Y8015914 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 18 Jul 2017 08:52:01 +0100 Reply-To: From: "Adrian Farrel" To: Date: Tue, 18 Jul 2017 08:51:59 +0100 Message-ID: <052501d2ff9a$bd6eb000$384c1000$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdL/mrqSsac/idxxRZ25yk1x/Ol6KQ== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.005 X-TM-AS-Result: No--1.223-10.0-31-10 X-imss-scan-details: No--1.223-10.0-31-10 X-TMASE-MatchedRID: c+q43O8gGZXRhEyb9f1sjuqwWVBfMuvoguwtqyXlE6EUaFGTA1BLwvBU q5JsuvxSesfuvocORfWRk6XtYogiarQ/aqQZTRfKfYXIYFyZ9yPZs3HUcS/scCq2rl3dzGQ1DMa EkdzxK5gZvRJreZcj9iDMq24R/A3JiAoB0nTkuBJV/2WHON2kozYWjgR8c2pdjkwkp0U3oPoj1S FBi5SOJ0bdNWawWa9+Zjt6ou/LDSQ= Archived-At: Subject: [sfc] NSH spec heads up X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 07:52:08 -0000 Just to say I am working on three things... 1. With Carlos to look at ensuring we handle unknown values of Next Protocol 2. With Med to see whether to supply text for Next Protocol = None 3. To check that all of my review comments on -12 have been addressed Trying to do this all ASAP. Adrian From nobody Tue Jul 18 01:12:52 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 681F812ECC0 for ; Tue, 18 Jul 2017 01:12:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f0UKO01CnJlo for ; Tue, 18 Jul 2017 01:12:47 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6FD1F120227 for ; Tue, 18 Jul 2017 01:12:47 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I8CjQp001440 for ; Tue, 18 Jul 2017 09:12:45 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I8CisK001419 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 18 Jul 2017 09:12:45 +0100 Reply-To: From: "Adrian Farrel" To: Date: Tue, 18 Jul 2017 09:12:43 +0100 Message-ID: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsg== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.005 X-TM-AS-Result: No--8.383-10.0-31-10 X-imss-scan-details: No--8.383-10.0-31-10 X-TMASE-MatchedRID: 88xOJNqQhq6Fg8+5j8XdKeqwWVBfMuvoj/xLIaDSshH4JyR+b5tvoMre 6JPva0/k9p3rVx907dRvXMBgOH2DwGMNX/9K+QfecFEiuPxHjsVVftPGBTR0rkw6MpTEJnCvBpN qUzwLvve+Cn6tO3PsLYz/G7qpCDBc09hRGROllGKzLD5kmcW6ZF/rMa/2tCxo2qqh/6B8PpHWEA KKV5ep8USVxDgQjF9Y5mKZWNO32alnnXPh4MD9IWwbuvhCHs3cTJDl9FKHbrnYIRSS/nf+VaPFj JEFr+olfeZdJ1Xsorg65tgsJWcFUSAHAopEd76vKNuCO1H+jYwuRmseJfbCPUZpwnfiVXapA2YV y/s6Z/gy18lL0vA4DQ== Archived-At: Subject: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 08:12:49 -0000 Hi, As we have been discussing we need to describe what implementations should do with unknown "Next Protocol" values. We also need to not block the future use of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph of 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END From nobody Tue Jul 18 01:41:52 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5E9AE131A76 for ; Tue, 18 Jul 2017 01:41:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Jn4WTUPRP6ey for ; Tue, 18 Jul 2017 01:41:48 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 68FB5131950 for ; Tue, 18 Jul 2017 01:41:48 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 04:41:47 -0400 From: Dave Dolson To: Adrian Farrel , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgABBxqp Date: Tue, 18 Jul 2017 08:41:46 +0000 Message-ID: <20170718084145.5140562.57688.23952@sandvine.com> References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> In-Reply-To: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="windows-1256" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 08:41:50 -0000 What is the rationale to drop (vs skip) unrecognized next-protocol values? And might the answer be different if O=3D1? E.g., if an SF implementation does not recognize MPLS, =FDwouldn't it be be= st to just forward (and count error)? David Dolson Sandvine Original Message From: Adrian Farrel Sent: Tuesday, July 18, 2017 10:12 AM To: sfc@ietf.org Reply To: adrian@olddog.co.uk Subject: [sfc] Update to NSH spec - Unknown Next Protocol Hi, As we have been discussing we need to describe what implementations should = do with unknown "Next Protocol" values. We also need to not block the future u= se of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph o= f 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Jul 18 01:54:25 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 22BE7131A92 for ; Tue, 18 Jul 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([173.37.93.157]) by rcdn-iport-8.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Jul 2017 08:54:18 +0000 Received: from XCH-RTP-009.cisco.com (xch-rtp-009.cisco.com [64.101.220.149]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id v6I8sIHk027310 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 18 Jul 2017 08:54:18 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-009.cisco.com (64.101.220.149) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 18 Jul 2017 04:54:17 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Tue, 18 Jul 2017 04:54:17 -0400 From: "Kent Leung (kleung)" To: "Reinaldo Penno (repenno)" , Dave Dolson , "Roberta Maglione (robmgl)" , "James N Guichard" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2A= Date: Tue, 18 Jul 2017 08:54:17 +0000 Message-ID: <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> In-Reply-To: <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.39.71] Content-Type: multipart/alternative; boundary="_000_6a0788234fec45909112016317e149fdXCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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a3F1b3RlPg0KPC9kaXY+DQo8L2JvZHk+DQo8L2h0bWw+DQo= --_000_6a0788234fec45909112016317e149fdXCHRTP006ciscocom_-- From nobody Tue Jul 18 01:56:20 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A7BB8131DC5 for ; Tue, 18 Jul 2017 01:56:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2rKCyg4_HHd8 for ; Tue, 18 Jul 2017 01:56:15 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6FC37131DCF for ; Tue, 18 Jul 2017 01:56:04 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 04:56:02 -0400 From: Kyle Larose To: "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAAEnTEA== Date: Tue, 18 Jul 2017 08:56:01 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> In-Reply-To: <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> 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([fe80::68ac:f071:19ff:3455]) by wtl-exchp-1.sandvine.com ([::1]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 05:14:43 -0400 From: Dave Dolson To: Kyle Larose , "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAAEnTEAAAR33A Date: Tue, 18 Jul 2017 09:14:42 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [217.75.209.98] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_E8355113905631478EFF04F5AA706E98A90667EEwtlexchp2sandvi_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 09:14:47 -0000 --_000_E8355113905631478EFF04F5AA706E98A90667EEwtlexchp2sandvi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SSB3YXMgbG9va2luZyBhdCA1LjQuMiBhZ2FpbiwgYW5kIGZyb20gdGhlIGFyZ3VtZW50cyBmb3Ig aXQsIEnigJltIG5vdCBzdXJlIGZvbGtzIHJlYWxpemUgaXQgaXMgdGhlIHVwcGVyIGJpdCB0aGF0 IGl0IHVzZWQgZm9yIGRpcmVjdGlvbi4gU28gaWYgcHJlc2VudGVkIGluIGRlY2ltYWwsIGUuZy4s IHBhdGhzIDQgYW5kIDIxNDc0ODM2NTIgYXJlIG9wcG9zaXRlIGRpcmVjdGlvbnMgKHBhaXJzKS4g Rm9yIHNvbWUgcmVhc29uIEnigJlkIGJlZW4gdGhpbmtpbmcgZXZlbi9vZGQgcGFpcnMuDQpLZW50 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Malis" Date: Tue, 18 Jul 2017 05:19:11 -0400 Message-ID: To: Adrian Farrel Cc: "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a113cced85f7379055494038a" Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 09:19:35 -0000 --001a113cced85f7379055494038a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Adrian, Two comments. 1. It=E2=80=99s inconsistent to use 0xFE and 0xFF in the main text, but 254= and 255 in the IANA considerations. We should pick one or the other, and have it the same at both places (I don=E2=80=99t have a particular preference). 2. Does the text: An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =E2=80=9CNOT attempt to pr= ocess=E2=80=9D actually means. Thanks, Andy On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel wrote: > Hi, > > As we have been discussing we need to describe what implementations shoul= d > do > with unknown "Next Protocol" values. We also need to not block the future > use of > 0x0 (which we might want for "none"). > > I think we need the following two changes. My words in the last paragraph > of 2.2 > seem excessive and I would be happy to see them reduced. > > (Note that a couple of typos are also fixed in the changed text.) > > Adrian > > --- > > Section 2.2 > OLD > Next Protocol: indicates the protocol type of the encapsulated data. > NSH does not alter the inner payload, and the semantics on the inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. > > This document defines the following Next Protocol values: > > 0x0: Reserved > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 > > An implementation not explicitly configured for a specific experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and > 0xFF. > NEW > Next Protocol: indicates the protocol type of the encapsulated data. > NSH does not alter the inner payload, and the semantics on the inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. > > This document defines the following Next Protocol values: > > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 > > An implementation not explicitly configured for a specific experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and > 0xFF. > > An implementation that does not recognize the Next Protocol value > SHOULD NOT attempt to examine or process the payload of a packet. > The meaning of this will depend on the role of a component within the > SFC system. For example, an SFF may be able to forward an NSH packet > without reference to the payload, but an SF applies a function to the > payload and so might be expected to understand the Next Protocol type. > By default, an implementation that needs to look at the payload of an > NSH packet MUST drop packets with unknown Next Protocol, but this > behavior SHOULD be configurable. > END > > --- > > 11.2.5 > > OLD > IANA is requested to set up a registry of "Next Protocol". These are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via "Expert > Review" as per [RFC8126]. > > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ > > Table 7: NSH Base Header Next Protocol Values > NEW > IANA is requested to set up a registry of "Next Protocol". These are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via "Expert > Review" as per [RFC8126]. > > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ > > Table 7: NSH Base Header Next Protocol Values > END > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --001a113cced85f7379055494038a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: base64 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YzwvYT48YnI+DQo8L2Jsb2NrcXVvdGU+PC9kaXY+PGJyPjwvZGl2Pg0K --001a113cced85f7379055494038a-- From nobody Tue Jul 18 02:29:06 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5FF15131DE6 for ; Tue, 18 Jul 2017 02:29:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KZJeKYf-ysi9 for ; Tue, 18 Jul 2017 02:29:01 -0700 (PDT) Received: from asmtp5.iomartmail.com (asmtp5.iomartmail.com [62.128.201.176]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C69DD131DDE for ; Tue, 18 Jul 2017 02:28:53 -0700 (PDT) Received: from asmtp5.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp5.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I9Spk4011592; Tue, 18 Jul 2017 10:28:51 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp5.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I9SoXu011546 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 18 Jul 2017 10:28:51 +0100 Reply-To: From: "Adrian Farrel" To: "'Dave Dolson'" , References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> <20170718084145.5140562.57688.23952@sandvine.com> In-Reply-To: <20170718084145.5140562.57688.23952@sandvine.com> Date: Tue, 18 Jul 2017 10:28:48 +0100 Message-ID: <05b501d2ffa8$43939620$cabac260$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJ3gtpwgzHy2VAzkzI0ZJPhMDOLfwGf7aIwoQNG5qA= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.005 X-TM-AS-Result: No--20.954-10.0-31-10 X-imss-scan-details: No--20.954-10.0-31-10 X-TMASE-MatchedRID: nI1cAR4k0HanykMun0J1wilrosmS0SOACmo4ilaIoanagsZM0qVv10xv /u7bQ6tr7vdqwcnNq24hza6cBranMrw0W8682qE11yMJs9mBCcVcSMp/1+Epp22Bc3xI+NwYRAw IPTXbPAH3hZIQK2TvRW5rFdD3CK9muAUmRVMDTAwM+FbAnNWFvr4kZYg1dp8sbaZMa0fgRtZWFs MQfbcNE6j6vby4dbyetbBnGR+nfu5fy7hYybs9JUNTnAhL0/m3Jo9b/LHGpC7Nyfof8Fi1fcLmp 4jPUF8tAWMdzSV1Iwb2mhGQByUXXkMpVZZsZyZGksHaPaQQRsDuHZGuwo6K7Xb2eSyaeOZLTwGb tBIjE5ZwKZvEQdp9LU9eRqVqoX9cS8ZV5Awn7MxUXvI6K7iraZSL3AH2CZxKC+GDDaNrl/ZJ9L4 3nm/22S/NY1UlVOvoy1dfXKy4FIMb+BGg6rnrdhJYKPR+Q5yciEwiOzRB3tnaqqH/oHw+kdYQAo pXl6nxRJXEOBCMX1jmYplY07fZqWedc+HgwP0hbBu6+EIezdxMkOX0UoduuQv/nTOPQovsDjZwj rQ6CQWekrOjtm4oRhw58L6+gfo0GAdnzrnkM49LaVG0xBoZkbHlqZYrZqdI+gtHj7OwNO0CpgET eT0ynA== Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 09:29:04 -0000 Dave, Yes, thanks, this is the discussion to have. 1. Suppose you are an SF and your job is to "do things" to IP packets. = Suppose you get an Ethernet frame, what do you do? Suppose you get a completely = unknown next protocol, what do you do? I think the default needs to be "drop the packet" because you can't do = your job, but I also think you should be "configurable" such that your job = definition includes "forward untouched those packets you can't process." But consider security SFs. They very probably should not forward packets = that they can't process. 2. Suppose you an SFC proxy. If you don't recognise the next protocol = type, then (presumably) your SF cannot process it and you should not pass it to the = SF. I think the default should be to drop the packet, but I can believe the = desire to configure that the proxy simply passes the packet back to the SFF. But consider proxies to security SFs. They very probably should not = return packets to the SFF making it look like the security function has been = performed. 3. Suppose you are a classifier (or re-classifier). Part of you = classification process is looking into the payload, but if you don't know the payload = type, you can't process it. I think the default should be to drop the packet, but I can believe a configuration that says "classify all unknown protocol types in the same = way". 4. Suppose you are an SFF. In general you don't need to look at the next protocol type and so the question does not arise (i.e., if you don't = look at the next protocol field, the value of the field cannot be unknown).=20 On the other hand, if you are an SFF that is load balancing based on the = payload packet then you probably use the next protocol field to decide how to = load balance (i.e., how to interpret the payload packet). In this case, I think the default should be to drop the packet, but I = can rationalise a configuration that says "load balance all unknown protocol = types in the same way". 5. Next protocol =3D "none" or other potential magic (such as OAM) fits, = I think, into the same four options. That is, if you need to understand the = special meaning of the next protocol field in order to correctly process the = packet, and if you don't understand the next protocol value, then you cannot = properly process the packet.=20 Anyway, that was my thought process. Adrian > -----Original Message----- > From: Dave Dolson [mailto:ddolson@sandvine.com] > Sent: 18 July 2017 09:42 > To: Adrian Farrel; sfc@ietf.org > Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol >=20 > What is the rationale to drop (vs skip) unrecognized next-protocol = values? > And might the answer be different if O=3D1? >=20 > E.g., if an SF implementation does not recognize MPLS, =FDwouldn't it = be best to just > forward (and count error)? >=20 > David Dolson > Sandvine > Original Message > From: Adrian Farrel > Sent: Tuesday, July 18, 2017 10:12 AM > To: sfc@ietf.org > Reply To: adrian@olddog.co.uk > Subject: [sfc] Update to NSH spec - Unknown Next Protocol >=20 >=20 > Hi, >=20 > As we have been discussing we need to describe what implementations = should > do > with unknown "Next Protocol" values. We also need to not block the = future use > of > 0x0 (which we might want for "none"). >=20 > I think we need the following two changes. My words in the last = paragraph of 2.2 > seem excessive and I would be happy to see them reduced. >=20 > (Note that a couple of typos are also fixed in the changed text.) >=20 > Adrian >=20 > --- >=20 > Section 2.2 > OLD > Next Protocol: indicates the protocol type of the encapsulated = data. > NSH does not alter the inner payload, and the semantics on the = inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. >=20 > This document defines the following Next Protocol values: >=20 > 0x0: Reserved > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 >=20 > An implementation not explicitly configured for a specific = experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE = and > 0xFF. > NEW > Next Protocol: indicates the protocol type of the encapsulated = data. > NSH does not alter the inner payload, and the semantics on the = inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. >=20 > This document defines the following Next Protocol values: >=20 > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 >=20 > An implementation not explicitly configured for a specific = experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE = and > 0xFF. >=20 > An implementation that does not recognize the Next Protocol value > SHOULD NOT attempt to examine or process the payload of a packet. > The meaning of this will depend on the role of a component within = the > SFC system. For example, an SFF may be able to forward an NSH = packet > without reference to the payload, but an SF applies a function to = the > payload and so might be expected to understand the Next Protocol = type. > By default, an implementation that needs to look at the payload of = an > NSH packet MUST drop packets with unknown Next Protocol, but this > behavior SHOULD be configurable. > END >=20 > --- >=20 > 11.2.5 >=20 > OLD > IANA is requested to set up a registry of "Next Protocol". These = are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via = "Expert > Review" as per [RFC8126]. >=20 > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ >=20 > Table 7: NSH Base Header Next Protocol Values > NEW > IANA is requested to set up a registry of "Next Protocol". These = are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via = "Expert > Review" as per [RFC8126]. >=20 > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ >=20 > Table 7: NSH Base Header Next Protocol Values > END >=20 > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Jul 18 02:30:45 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FD08131AE6 for ; Tue, 18 Jul 2017 02:30:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jCqq-RKurFri for ; Tue, 18 Jul 2017 02:30:41 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E6A49131DB8 for ; Tue, 18 Jul 2017 02:30:39 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I9UaYQ022429; Tue, 18 Jul 2017 10:30:36 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6I9UYJs022393 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 18 Jul 2017 10:30:35 +0100 Reply-To: From: "Adrian Farrel" To: "'Andrew G. Malis'" Cc: References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> In-Reply-To: Date: Tue, 18 Jul 2017 10:30:32 +0100 Message-ID: <05bc01d2ffa8$81d95be0$858c13a0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_05BD_01D2FFB0.E3A230B0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJ3gtpwgzHy2VAzkzI0ZJPhMDOLfwHG90CfoQITLZA= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.005 X-TM-AS-Result: No--20.863-10.0-31-10 X-imss-scan-details: No--20.863-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO3oItLliax8Q1aOpp/sV5nVYarbRDQlpicRx1ZQY4Xt8j11 qDA2H+Xst0vxg7A0aKZVsMY0wiX0wxKwwliN4mNuo4Ef+Wmk9x0Ijen4m7yaqlvym/gvSH4iWmB 3n3nOpxITQuJIzcBeKZ2DdYyTLheO/fO7uLFz2SMmtTGirqG/D4fGLZ++QpQzxaQNbiRXdZrK3u iT72tP5Pad61cfdO3Ub1zAYDh9g8BjDV//SvkH3nBRIrj8R47FVX7TxgU0dK5nnK6mXN72m+lhg fFGvhkMHF8iSIjRei1Ndr9XBa5Amgl2fBUMKi6YLi5PDX0qWHpWjiXAsVR2K9YIrMNiSqPJP1/s v2MLzy5nNLxm8uBMvtJnWu2YYhG6HVikQ9YmLLNNVr4vdmCpzpJOcXMQc4jBaOWLD7G8i13zb5k mgp405TmoOWEBgQUvSaVfaxxV94825XOhnouJ5Xe8jMDtfIiIIQXVF2qsdV213HaVceMXUiL8Ha C6OsQfMHoR0KY0MZVVsQM/S7OiNT3j8irIPFj/8hUvf4pI2DCRPMCAcbl40qAkf3vialurqBOQu BO1OCBeqXaEhzCXaxMfL/qOWmMdPiAaQSjAgpk2zdLf3NqhdhTbB6yIhfK7Fb73eKpG9ftUPghf caHOS5xNkaIFR3x9rBBSnn/GVMbbKAyc+TgM3GOILin78AgWMx981lgKTcNLwIXeA1TZXfpGF+B VZ0LnKNalPPB8JbUmjXlkxNfA/C95uXownWhRnQrZDK7DrTqZEoWHC6Rh/WTNuWQFsA2GYBBGfc v6WOGNIndKSIasU9eS5VWUkyw9nHoiWJ/w7MaeAiCmPx4NwGmRqNBHmBve1kTfEkyaZdxFGCd0S 0NCsnjWKoeC41szuQof0tSGVGOW39mqWR8I3Pl6pe2U1OiYNkUSDDq742k= Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 09:30:43 -0000 This is a multipart message in MIME format. ------=_NextPart_000_05BD_01D2FFB0.E3A230B0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Fun, Andy! =20 The two questions apply to text I haven't modified. I pass the questions on to WG/authors. =20 My opinions are: 1. Yes 2. Yes, we should be explicit. =20 A =20 From: Andrew G. Malis [mailto:agmalis@gmail.com]=20 Sent: 18 July 2017 10:19 To: Adrian Farrel Cc: sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol =20 Adrian, =20 Two comments. =20 1. It=E2=80=99s inconsistent to use 0xFE and 0xFF in the main text, but = 254 and 255 in the IANA considerations. We should pick one or the other, = and have it the same at both places (I don=E2=80=99t have a particular = preference). =20 2. Does the text: =20 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =E2=80=9CNOT attempt to = process=E2=80=9D actually means. =20 Thanks, Andy =20 =20 On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel = wrote: Hi, As we have been discussing we need to describe what implementations = should do with unknown "Next Protocol" values. We also need to not block the = future use of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last = paragraph of 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol = type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc =20 ------=_NextPart_000_05BD_01D2FFB0.E3A230B0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Fun, = Andy!

 

The two questions apply to = text I haven't modified.

I pass the questions on to = WG/authors.

 

My opinions = are:

1. Yes

2. Yes, we should be = explicit.

 

A

 

From: Andrew G. Malis = [mailto:agmalis@gmail.com]
Sent: 18 July 2017 = 10:19
To: Adrian Farrel
Cc: = sfc@ietf.org
Subject: Re: [sfc] Update to NSH spec - Unknown = Next Protocol

 

Adrian,

 

Two comments.

 

1. It=E2=80=99s inconsistent to use 0xFE and 0xFF in = the main text, but 254 and 255 in the IANA considerations. We should = pick one or the other, and have it the same at both places (I = don=E2=80=99t have a particular preference).

 

2. Does the text:

 

  =  An implementation not explicitly configured for a specific = experiment
   [RFC3692] SHOULD NOT attempt to process Next = Protocol values 0xFE and
  =  0xFF.

mean = drop or forward? We should be explicit what =E2=80=9CNOT attempt to = process=E2=80=9D actually means.

 

Thanks,

Andy

 

 

On Tue, = Jul 18, 2017 at 4:12 AM, Adrian Farrel <adrian@olddog.co.uk> wrote:

Hi,

As we have been discussing we need to = describe what implementations should do
with unknown "Next = Protocol" values. We also need to not block the future use = of
0x0 (which we might want for "none").

I think we = need the following two changes. My words in the last paragraph of = 2.2
seem excessive and I would be happy to see them = reduced.

(Note that a couple of typos are also fixed in the = changed text.)

Adrian

---

Section = 2.2
OLD
   Next Protocol: indicates the protocol type of = the encapsulated data.
   NSH does not alter the inner = payload, and the semantics on the inner
   protocol remain = unchanged due to NSH service function chaining.
   Please = see the IANA Considerations section below, Section 11.2.5.

  =  This document defines the following Next Protocol = values:

   0x0: Reserved
   0x1: = IPv4
   0x2: IPv6
   0x3: Ethernet
  =  0x4: NSH
   0x5: MPLS
   0xFE: = Experiment 1
   0xFF: Experiment 2

   An = implementation not explicitly configured for a specific = experiment
   [RFC3692] SHOULD NOT attempt to process Next = Protocol values 0xFE and
   0xFF.
NEW
  =  Next Protocol: indicates the protocol type of the encapsulated = data.
   NSH does not alter the inner payload, and the = semantics on the inner
   protocol remain unchanged due to = NSH service function chaining.
   Please see the IANA = Considerations section below, Section 11.2.5.

   This = document defines the following Next Protocol values:

  =  0x1: IPv4
   0x2: IPv6
   0x3: = Ethernet
   0x4: NSH
   0x5: MPLS
  =  0xFE: Experiment 1
   0xFF: Experiment = 2

   An implementation not explicitly configured for a = specific experiment
   [RFC3692] SHOULD NOT attempt to = process Next Protocol values 0xFE and
  =  0xFF.

   An implementation that does not = recognize the Next Protocol value
   SHOULD NOT attempt to = examine or process the payload of a packet.
   The meaning = of this will depend on the role of a component within the
  =  SFC system.  For example, an SFF may be able to forward an = NSH packet
   without reference to the payload, but an SF = applies a function to the
   payload and so might be = expected to understand the Next Protocol type.
   By = default, an implementation that needs to look at the payload of = an
   NSH packet MUST drop packets with unknown Next = Protocol, but this
   behavior SHOULD be = configurable.
END

---

11.2.5

OLD
  =  IANA is requested to set up a registry of "Next = Protocol".  These are
   8-bit values.  Next = Protocol values 1, 2, 3, 4, and 5 are defined
   in this = document (see Table 7).  New values are assigned via = "Expert
   Review" as per = [RFC8126].

            =  +---------------+--------------+---------------+
    =          | Next Protocol | Description  | = Reference     |
          =    +---------------+--------------+---------------+
  =            | 0        =      | Unassigned   |      =          |
        =      |              =  |              |    =            |
      =        | 1            =  | IPv4         | This document = |
             |    =            |        =       |              =  |
             | 2  =            | IPv6      =    | This document |
          =    |              =  |              |    =            |
      =        | 3            =  | Ethernet     | This document |
    =          |          =      |              = |               |
  =            | 4        =      | NSH          | This = document |
             |  =              |      =         |            =    |
             | = 5             | MPLS    =      | This document |
        =      |              =  |              |    =            |
      =        | 6..253        | = Unassigned   |              =  |
             |  =              |      =         |            =    |
             | = 254           | Experiment 1 | This = document |
             |  =              |      =         |            =    |
             | = 255           | Experiment 2 | This = document |
            =  +---------------+--------------+---------------+

  =              Table 7: NSH Base Header = Next Protocol Values
NEW
   IANA is requested to set up = a registry of "Next Protocol".  These are
  =  8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are = defined
   in this document (see Table 7).  New values = are assigned via "Expert
   Review" as per = [RFC8126].

            =  +---------------+--------------+---------------+
    =          | Next Protocol | Description  | = Reference     |
          =    +---------------+--------------+---------------+
  =            | 0        =      | Unassigned   |      =          |
        =      |              =  |              |    =            |
      =        | 1            =  | IPv4         | This document = |
             |    =            |        =       |              =  |
             | 2  =            | IPv6      =    | This document |
          =    |              =  |              |    =            |
      =        | 3            =  | Ethernet     | This document |
    =          |          =      |              = |               |
  =            | 4        =      | NSH          | This = document |
             |  =              |      =         |            =    |
             | = 5             | MPLS    =      | This document |
        =      |              =  |              |    =            |
      =        | 6..253        | = Unassigned   |              =  |
             |  =              |      =         |            =    |
             | = 254           | Experiment 1 | This = document |
             |  =              |      =         |            =    |
             | = 255           | Experiment 2 | This = document |
            =  +---------------+--------------+---------------+

  =              Table 7: NSH Base Header = Next Protocol = Values
END

_______________________________________________
s= fc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

 

------=_NextPart_000_05BD_01D2FFB0.E3A230B0-- From nobody Tue Jul 18 03:36:30 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 51A1C12EB5F for ; Tue, 18 Jul 2017 03:36:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 94ux5lCGL9CW for ; Tue, 18 Jul 2017 03:36:26 -0700 (PDT) Received: from mail1.sandvine.com (Mail1.sandvine.com [64.7.137.134]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25EBE1270B4 for ; Tue, 18 Jul 2017 03:36:26 -0700 (PDT) Received: from BLR-EXCHP-2.sandvine.com (192.168.196.172) by WTL-EXCHP-2.sandvine.com (192.168.194.177) with Microsoft SMTP Server (TLS) id 14.3.319.2; Tue, 18 Jul 2017 06:36:24 -0400 Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by blr-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 06:36:24 -0400 From: Dave Dolson To: "adrian@olddog.co.uk" , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgABBxqpAAoGNQAABjPioA== Date: Tue, 18 Jul 2017 10:36:22 +0000 Message-ID: References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> <20170718084145.5140562.57688.23952@sandvine.com> <05b501d2ffa8$43939620$cabac260$@olddog.co.uk> In-Reply-To: <05b501d2ffa8$43939620$cabac260$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [31.133.142.50] x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 10:36:28 -0000 If I may paraphrase, we should set the operator's expectation that unknown= =3Ddrop by default, because this will be less surprising than functions not= being applied. I'm OK with that. -----Original Message----- From: Adrian Farrel [mailto:adrian@olddog.co.uk]=20 Sent: Tuesday, July 18, 2017 11:29 AM To: Dave Dolson; sfc@ietf.org Subject: RE: [sfc] Update to NSH spec - Unknown Next Protocol Dave, Yes, thanks, this is the discussion to have. 1. Suppose you are an SF and your job is to "do things" to IP packets. Supp= ose you get an Ethernet frame, what do you do? Suppose you get a completely= unknown next protocol, what do you do? I think the default needs to be "drop the packet" because you can't do your= job, but I also think you should be "configurable" such that your job defi= nition includes "forward untouched those packets you can't process." But consider security SFs. They very probably should not forward packets th= at they can't process. 2. Suppose you an SFC proxy. If you don't recognise the next protocol type,= then (presumably) your SF cannot process it and you should not pass it to the SF= . I think the default should be to drop the packet, but I can believe the des= ire to configure that the proxy simply passes the packet back to the SFF. But consider proxies to security SFs. They very probably should not return = packets to the SFF making it look like the security function has been perfo= rmed. 3. Suppose you are a classifier (or re-classifier). Part of you classificat= ion process is looking into the payload, but if you don't know the payload = type, you can't process it. I think the default should be to drop the packet, but I can believe a confi= guration that says "classify all unknown protocol types in the same way". 4. Suppose you are an SFF. In general you don't need to look at the next pr= otocol type and so the question does not arise (i.e., if you don't look at = the next protocol field, the value of the field cannot be unknown).=20 On the other hand, if you are an SFF that is load balancing based on the pa= yload packet then you probably use the next protocol field to decide how to= load balance (i.e., how to interpret the payload packet). In this case, I think the default should be to drop the packet, but I can r= ationalise a configuration that says "load balance all unknown protocol typ= es in the same way". 5. Next protocol =3D "none" or other potential magic (such as OAM) fits, I = think, into the same four options. That is, if you need to understand the s= pecial meaning of the next protocol field in order to correctly process the= packet, and if you don't understand the next protocol value, then you cann= ot properly process the packet.=20 Anyway, that was my thought process. Adrian > -----Original Message----- > From: Dave Dolson [mailto:ddolson@sandvine.com] > Sent: 18 July 2017 09:42 > To: Adrian Farrel; sfc@ietf.org > Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol >=20 > What is the rationale to drop (vs skip) unrecognized next-protocol values= ? > And might the answer be different if O=3D1? >=20 > E.g., if an SF implementation does not recognize MPLS, =FDwouldn't it be= =20 > best to just > forward (and count error)? >=20 > David Dolson > Sandvine > Original Message > From: Adrian Farrel > Sent: Tuesday, July 18, 2017 10:12 AM > To: sfc@ietf.org > Reply To: adrian@olddog.co.uk > Subject: [sfc] Update to NSH spec - Unknown Next Protocol >=20 >=20 > Hi, >=20 > As we have been discussing we need to describe what implementations=20 > should do with unknown "Next Protocol" values. We also need to not=20 > block the future use of > 0x0 (which we might want for "none"). >=20 > I think we need the following two changes. My words in the last=20 > paragraph of 2.2 > seem excessive and I would be happy to see them reduced. >=20 > (Note that a couple of typos are also fixed in the changed text.) >=20 > Adrian >=20 > --- >=20 > Section 2.2 > OLD > Next Protocol: indicates the protocol type of the encapsulated data. > NSH does not alter the inner payload, and the semantics on the inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. >=20 > This document defines the following Next Protocol values: >=20 > 0x0: Reserved > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 >=20 > An implementation not explicitly configured for a specific experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and > 0xFF. > NEW > Next Protocol: indicates the protocol type of the encapsulated data. > NSH does not alter the inner payload, and the semantics on the inner > protocol remain unchanged due to NSH service function chaining. > Please see the IANA Considerations section below, Section 11.2.5. >=20 > This document defines the following Next Protocol values: >=20 > 0x1: IPv4 > 0x2: IPv6 > 0x3: Ethernet > 0x4: NSH > 0x5: MPLS > 0xFE: Experiment 1 > 0xFF: Experiment 2 >=20 > An implementation not explicitly configured for a specific experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and > 0xFF. >=20 > An implementation that does not recognize the Next Protocol value > SHOULD NOT attempt to examine or process the payload of a packet. > The meaning of this will depend on the role of a component within the > SFC system. For example, an SFF may be able to forward an NSH packet > without reference to the payload, but an SF applies a function to the > payload and so might be expected to understand the Next Protocol type. > By default, an implementation that needs to look at the payload of an > NSH packet MUST drop packets with unknown Next Protocol, but this > behavior SHOULD be configurable. > END >=20 > --- >=20 > 11.2.5 >=20 > OLD > IANA is requested to set up a registry of "Next Protocol". These are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via "Expert > Review" as per [RFC8126]. >=20 > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ >=20 > Table 7: NSH Base Header Next Protocol Values NEW > IANA is requested to set up a registry of "Next Protocol". These are > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > in this document (see Table 7). New values are assigned via "Expert > Review" as per [RFC8126]. >=20 > +---------------+--------------+---------------+ > | Next Protocol | Description | Reference | > +---------------+--------------+---------------+ > | 0 | Unassigned | | > | | | | > | 1 | IPv4 | This document | > | | | | > | 2 | IPv6 | This document | > | | | | > | 3 | Ethernet | This document | > | | | | > | 4 | NSH | This document | > | | | | > | 5 | MPLS | This document | > | | | | > | 6..253 | Unassigned | | > | | | | > | 254 | Experiment 1 | This document | > | | | | > | 255 | Experiment 2 | This document | > +---------------+--------------+---------------+ >=20 > Table 7: NSH Base Header Next Protocol Values END >=20 > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Jul 18 04:20:07 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DB197131488; Tue, 18 Jul 2017 04:20:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.689 X-Spam-Level: X-Spam-Status: No, score=-2.689 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_HK_NAME_FM_MR_MRS=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LblXc10ioORc; Tue, 18 Jul 2017 04:19:59 -0700 (PDT) Received: from mail-it0-x232.google.com (mail-it0-x232.google.com [IPv6:2607:f8b0:4001:c0b::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7CAF0131471; Tue, 18 Jul 2017 04:19:59 -0700 (PDT) Received: by mail-it0-x232.google.com with SMTP id v127so1834443itd.0; Tue, 18 Jul 2017 04:19:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=5MeSrK/k3JGOgDlSatlwTg2w3+tdP6nY/9zx4jaQayg=; b=Y88B0Rke86pdRAAPovOMADU/JetZ1wg6/VLaYMEoSkbV3A56EMFsOYd4CiEt2ODmzq aHJATGVcQNF+iEA8NpgsBfE6KAJk3e+7SNqpF+1uTtQkebA4jv7t3Hj1JT6C+Z+NIRdz UZD3lOjsd/XFfpfD/J8J4ijbZ/H8ItBHC7DU8hUUNBFmugvKatSfeW5ibgCX4AG46lwu 1NtoA/AkNtKylXBqqeA53EM1m8DmkZ6yTvFcRK4Du7SPBxYdzWI6+C74ZBwJvj4c1Zv6 KbgX2ku7JIK1kmrgIRyqIHmxJXuiKqO5d/T3JTP3YpsV5zTrXe9HAKyRmFOOShsHfIzb Jm6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=5MeSrK/k3JGOgDlSatlwTg2w3+tdP6nY/9zx4jaQayg=; b=gvJq+LeCjbj3lPj0aFjYEO+ZxvdEc66XGGu5TmOPAlwViN2heZVEAYiAyi+v7PmGBO BkiReZqwhTL96I10TIHtYhJka5lVXTMRgjbpe2PH6nZ9BY9vOzBrZ4HTePkJ0uP23+cd plN7lF8OK28+ej95NhoRjmAcV170lM7liTJ27ILb0fP9+W2PMcD2FSBC9OsDU1IXmCun GxJfHinjixin6uXDGj6E8CI1EGMVieYYtWybvQGVflxk0sQyNfyoNvxpk1VepGfUL2Jq ZdNgNiDqqMs5uTefRpAa6W9aEwuekMr9ti4jBIynbno4DlD1UpvCWgFJjfHXqbBg6tzB sPIg== X-Gm-Message-State: AIVw111mWm7ONwSLcM5JYDMolN1iSyZlRJtZG9oh/qkeYrjzUoqbY5FI ASW1CvYiPHxLV/YApmU2m4dNgl7l8W4z X-Received: by 10.36.95.65 with SMTP id r62mr1886465itb.40.1500376798537; Tue, 18 Jul 2017 04:19:58 -0700 (PDT) MIME-Version: 1.0 Received: by 10.79.32.143 with HTTP; Tue, 18 Jul 2017 04:19:27 -0700 (PDT) From: "Mr. Jaehoon Paul Jeong" Date: Tue, 18 Jul 2017 13:19:27 +0200 Message-ID: To: sfc@ietf.org Cc: "i2nsf@ietf.org" , skku_secu-brain_all@googlegroups.com, Sangwon Hyun , "Mr. Jaehoon Paul Jeong" Content-Type: multipart/alternative; boundary="001a11449a081b33e5055495b2f1" Archived-At: Subject: [sfc] Request for Comments for I2NSF SFC Draft X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 11:20:01 -0000 --001a11449a081b33e5055495b2f1 Content-Type: text/plain; charset="UTF-8" Hi SFC WG, The link below is an Internet Draft of the I2NSF WG, which is related to SFC. https://tools.ietf.org/html/draft-hyun-i2nsf-nsf-triggered-steering-03 This draft describes the integration of the I2NSF framework and SFC to support packet forwarding between Network Security Functions (NSFs) as service functions. The I2NSF framework defines an advanced security action that allows an NSF to call another type of NSF for further security inspection and action. For example, a firewall filter calls a DPI for more in-depth analysis of a suspicious packet. For such advanced security action to be realized, the suspicious packet should be delivered from the firewall filter to the DPI. To enable this forwarding, we integrate SFC components into the I2NSF framework. Welcome your comments in the I2NSF on-site meeting or by email. Thanks. Best regards, Paul and Sangwon -- =========================== Mr. Jaehoon (Paul) Jeong, Ph.D. Assistant Professor Department of Software Sungkyunkwan University Office: +82-31-299-4957 Email: jaehoon.paul@gmail.com, pauljeong@skku.edu Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php --001a11449a081b33e5055495b2f1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable To enable this forwarding, we integrate SFC components into the I2NSF fr= amework.


--001a11449a081b33e5055495b2f1-- From nobody Tue Jul 18 05:10:17 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0914412EBF7 for ; Tue, 18 Jul 2017 05:10:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WsfvGp3R7DKF for ; Tue, 18 Jul 2017 05:10:11 -0700 (PDT) Received: from asmtp4.iomartmail.com (asmtp4.iomartmail.com [62.128.201.175]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 90223127599 for ; Tue, 18 Jul 2017 05:10:10 -0700 (PDT) Received: from asmtp4.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6ICA8ln012833; Tue, 18 Jul 2017 13:10:08 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6ICA7xu012811 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 18 Jul 2017 13:10:08 +0100 Reply-To: From: "Adrian Farrel" To: "'Dave Dolson'" , References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> <20170718084145.5140562.57688.23952@sandvine.com> <05b501d2ffa8$43939620$cabac260$@olddog.co.uk> In-Reply-To: Date: Tue, 18 Jul 2017 13:10:06 +0100 Message-ID: <063e01d2ffbe$cbdc5790$639506b0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJ3gtpwgzHy2VAzkzI0ZJPhMDOLfwGf7aIwAjk8NxkBjI3tQqDlSfIQ Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.006 X-TM-AS-Result: No--34.523-10.0-31-10 X-imss-scan-details: No--34.523-10.0-31-10 X-TMASE-MatchedRID: z5DqD3Ob671NlZ1zEcyAY/HkpkyUphL9Ud7Bjfo+5jQRx1ZQY4Xt8j11 qDA2H+Xst0vxg7A0aKY3PPRFEsUBpEHgiCODMdHvnbUZkYTzXIYS12tj9Zvd82rhyhOS2sZfFFg wUuCku8jyy4FRw4fz6sMLCvHs59fNvDRbzrzaoTXXIwmz2YEJxUPfD5jpTqwPa0TOsL14A2nTGN NDxXmvcVGNSqwyVAvrbfJnTGa+euSXh6Ql72moIRcqpH7D1rtQIM86Aeo6sYIwyfWtyopBqJQhe x7OR/g7qPq9vLh1vJ61sGcZH6d+7l/LuFjJuz0lQ1OcCEvT+be0LVEBnI7x1Z722hDqHosT+FOr z9Yyy2/fbgsf980Rl4HGS3R7abvXTc13JBBj+TQVqIrb10PDGY/8SyGg0rIRKAzGd8VeOIhTkve YVleS07nU+t+Ll++4VcuiE76FYvQGQODpkAFmIRHuQ9dDJbS2wx0jRRxcQfN4X2t7q5DnFQGuF1 ezBIz58mZjXVB6C5C5ylpKbZd+QU5/fYay/W3cwVaayvK71l+zWETBQPV38sndkGBlszVvZvo+m FW19mCSnnSrW/3jGZYlxuk1ogQA+zoAW8R15l8c8J6ZrWP/q30tCKdnhB58jkOTSFEDhI4c4WL5 Jjd88I2j49Ftap9EkGUtrowrXLg= Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 12:10:14 -0000 Dave, Why shouldn't I use 1000 words where 22 would do? ;-) Adrian > -----Original Message----- > From: Dave Dolson [mailto:ddolson@sandvine.com] > Sent: 18 July 2017 11:36 > To: adrian@olddog.co.uk; sfc@ietf.org > Subject: RE: [sfc] Update to NSH spec - Unknown Next Protocol >=20 > If I may paraphrase, we should set the operator's expectation that > unknown=3Ddrop by default, because this will be less surprising than = functions not > being applied. >=20 > I'm OK with that. >=20 >=20 > -----Original Message----- > From: Adrian Farrel [mailto:adrian@olddog.co.uk] > Sent: Tuesday, July 18, 2017 11:29 AM > To: Dave Dolson; sfc@ietf.org > Subject: RE: [sfc] Update to NSH spec - Unknown Next Protocol >=20 > Dave, > Yes, thanks, this is the discussion to have. >=20 > 1. Suppose you are an SF and your job is to "do things" to IP packets. = Suppose > you get an Ethernet frame, what do you do? Suppose you get a = completely > unknown next protocol, what do you do? >=20 > I think the default needs to be "drop the packet" because you can't do = your job, > but I also think you should be "configurable" such that your job = definition > includes "forward untouched those packets you can't process." >=20 > But consider security SFs. They very probably should not forward = packets that > they can't process. >=20 > 2. Suppose you an SFC proxy. If you don't recognise the next protocol = type, then > (presumably) your SF cannot process it and you should not pass it to = the SF. >=20 > I think the default should be to drop the packet, but I can believe = the desire to > configure that the proxy simply passes the packet back to the SFF. >=20 > But consider proxies to security SFs. They very probably should not = return > packets to the SFF making it look like the security function has been performed. >=20 > 3. Suppose you are a classifier (or re-classifier). Part of you = classification process is > looking into the payload, but if you don't know the payload type, you = can't > process it. >=20 > I think the default should be to drop the packet, but I can believe a configuration > that says "classify all unknown protocol types in the same way". >=20 > 4. Suppose you are an SFF. In general you don't need to look at the = next protocol > type and so the question does not arise (i.e., if you don't look at = the next > protocol field, the value of the field cannot be unknown). >=20 > On the other hand, if you are an SFF that is load balancing based on = the payload > packet then you probably use the next protocol field to decide how to = load > balance (i.e., how to interpret the payload packet). >=20 > In this case, I think the default should be to drop the packet, but I = can rationalise > a configuration that says "load balance all unknown protocol types in = the same > way". >=20 > 5. Next protocol =3D "none" or other potential magic (such as OAM) = fits, I think, into > the same four options. That is, if you need to understand the special = meaning of > the next protocol field in order to correctly process the packet, and = if you don't > understand the next protocol value, then you cannot properly process = the > packet. >=20 >=20 > Anyway, that was my thought process. >=20 > Adrian >=20 >=20 > > -----Original Message----- > > From: Dave Dolson [mailto:ddolson@sandvine.com] > > Sent: 18 July 2017 09:42 > > To: Adrian Farrel; sfc@ietf.org > > Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol > > > > What is the rationale to drop (vs skip) unrecognized next-protocol = values? > > And might the answer be different if O=3D1? > > > > E.g., if an SF implementation does not recognize MPLS, =FDwouldn't = it be > > best to > just > > forward (and count error)? > > > > David Dolson > > Sandvine > > Original Message > > From: Adrian Farrel > > Sent: Tuesday, July 18, 2017 10:12 AM > > To: sfc@ietf.org > > Reply To: adrian@olddog.co.uk > > Subject: [sfc] Update to NSH spec - Unknown Next Protocol > > > > > > Hi, > > > > As we have been discussing we need to describe what implementations > > should do with unknown "Next Protocol" values. We also need to not > > block the future use of > > 0x0 (which we might want for "none"). > > > > I think we need the following two changes. My words in the last > > paragraph of > 2.2 > > seem excessive and I would be happy to see them reduced. > > > > (Note that a couple of typos are also fixed in the changed text.) > > > > Adrian > > > > --- > > > > Section 2.2 > > OLD > > Next Protocol: indicates the protocol type of the encapsulated = data. > > NSH does not alter the inner payload, and the semantics on the = inner > > protocol remain unchanged due to NSH service function chaining. > > Please see the IANA Considerations section below, Section 11.2.5. > > > > This document defines the following Next Protocol values: > > > > 0x0: Reserved > > 0x1: IPv4 > > 0x2: IPv6 > > 0x3: Ethernet > > 0x4: NSH > > 0x5: MPLS > > 0xFE: Experiment 1 > > 0xFF: Experiment 2 > > > > An implementation not explicitly configured for a specific = experiment > > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE = and > > 0xFF. > > NEW > > Next Protocol: indicates the protocol type of the encapsulated = data. > > NSH does not alter the inner payload, and the semantics on the = inner > > protocol remain unchanged due to NSH service function chaining. > > Please see the IANA Considerations section below, Section 11.2.5. > > > > This document defines the following Next Protocol values: > > > > 0x1: IPv4 > > 0x2: IPv6 > > 0x3: Ethernet > > 0x4: NSH > > 0x5: MPLS > > 0xFE: Experiment 1 > > 0xFF: Experiment 2 > > > > An implementation not explicitly configured for a specific = experiment > > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE = and > > 0xFF. > > > > An implementation that does not recognize the Next Protocol value > > SHOULD NOT attempt to examine or process the payload of a packet. > > The meaning of this will depend on the role of a component within = the > > SFC system. For example, an SFF may be able to forward an NSH = packet > > without reference to the payload, but an SF applies a function to = the > > payload and so might be expected to understand the Next Protocol = type. > > By default, an implementation that needs to look at the payload = of an > > NSH packet MUST drop packets with unknown Next Protocol, but this > > behavior SHOULD be configurable. > > END > > > > --- > > > > 11.2.5 > > > > OLD > > IANA is requested to set up a registry of "Next Protocol". These = are > > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > > in this document (see Table 7). New values are assigned via = "Expert > > Review" as per [RFC8126]. > > > > +---------------+--------------+---------------+ > > | Next Protocol | Description | Reference | > > +---------------+--------------+---------------+ > > | 0 | Unassigned | | > > | | | | > > | 1 | IPv4 | This document | > > | | | | > > | 2 | IPv6 | This document | > > | | | | > > | 3 | Ethernet | This document | > > | | | | > > | 4 | NSH | This document | > > | | | | > > | 5 | MPLS | This document | > > | | | | > > | 6..253 | Unassigned | | > > | | | | > > | 254 | Experiment 1 | This document | > > | | | | > > | 255 | Experiment 2 | This document | > > +---------------+--------------+---------------+ > > > > Table 7: NSH Base Header Next Protocol Values NEW > > IANA is requested to set up a registry of "Next Protocol". These = are > > 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined > > in this document (see Table 7). New values are assigned via = "Expert > > Review" as per [RFC8126]. > > > > +---------------+--------------+---------------+ > > | Next Protocol | Description | Reference | > > +---------------+--------------+---------------+ > > | 0 | Unassigned | | > > | | | | > > | 1 | IPv4 | This document | > > | | | | > > | 2 | IPv6 | This document | > > | | | | > > | 3 | Ethernet | This document | > > | | | | > > | 4 | NSH | This document | > > | | | | > > | 5 | MPLS | This document | > > | | | | > > | 6..253 | Unassigned | | > > | | | | > > | 254 | Experiment 1 | This document | > > | | | | > > | 255 | Experiment 2 | This document | > > +---------------+--------------+---------------+ > > > > Table 7: NSH Base Header Next Protocol Values END > > > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Jul 18 06:12:17 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 22AC7131B52 for ; Tue, 18 Jul 2017 06:12:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.631 X-Spam-Level: X-Spam-Status: No, score=-0.631 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y1gebIA_zMms for ; Tue, 18 Jul 2017 06:12:12 -0700 (PDT) Received: from hub021-ca-2.exch021.serverdata.net (hub021-ca-2.exch021.serverdata.net [64.78.22.169]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 782AA131B46 for ; Tue, 18 Jul 2017 06:12:12 -0700 (PDT) Received: from MBX021-W3-CA-2.exch021.domain.local ([10.254.4.78]) by HUB021-CA-2.exch021.domain.local ([10.254.4.33]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 06:12:11 -0700 From: Ron Parker To: "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACIKd4AAAhrTgAAAUD4AAAAxu6AACekloAABb+SAA== Date: Tue, 18 Jul 2017 13:12:11 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> In-Reply-To: <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [50.203.66.100] Content-Type: 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[31.133.132.185]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 684D0240D43; Tue, 18 Jul 2017 06:58:04 -0700 (PDT) To: Ron Parker , "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard Cc: "sfc@ietf.org" References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> From: "Joel M. Halpern" Message-ID: <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> Date: Tue, 18 Jul 2017 09:58:02 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 13:58:09 -0000 Since there are not always two directions, I would prefer not to define that bit as always meaning direction. I do not mind if the bit is used by configuration in a directional fashion. (It is odd, but clearly works.) Yours, Joel On 7/18/17 9:12 AM, Ron Parker wrote: > I support 5.4.1 (single SPI with direction indicated in SI). That > being said, the approach effectively reduces SI by 1 bit and reallocates > that bit to direction. Is it feasible to instead be explicit by > creating an direction bit? Also, how do we refer to directions? > East/West? North/South? Left/Right? Upstream/Downstream? > > Ron > > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung (kleung) > *Sent:* Tuesday, July 18, 2017 4:54 AM > *To:* Reinaldo Penno (repenno) ; Dave Dolson > ; Roberta Maglione (robmgl) ; > James N Guichard > *Cc:* sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi Reinaldo. I agree we need to get agreement in WG and update the draft > soon as folks are unsure what to implement. > > It seems most folks have chimed in. Here’s the latest count. I’m putting > names down to make sure the count is accurate. > > Sect 5.4.1 (one service path ID, service index indicates flow direction): > > -(2) Dave, Joel > > Sect 5.4.2 (two service path IDs, each indicate flow direction): > > -(6) Sumandra, Jim, Kent, Renaldo, Roberta, Paul > > Do we have some rough consensus yet? Or wait for more opinions to decide? > > Kent > > *From:* Reinaldo Penno (repenno) > *Sent:* Monday, July 17, 2017 3:59 PM > *To:* Kent Leung (kleung) >; > Dave Dolson >; > Roberta Maglione (robmgl) >; > James N Guichard > > *Cc:* sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi Kent/others, > > this decision is quite important for real deployments, as opposed to > demos and related. I hope as the first step we all agree that we cannot > have more than one way of interpreting directionality of paths and > associated reverse paths. That would be an interoperability nightmare > and reduce the usefulness of NSH considerably. > > So, whatever way it goes the WG needs to embrace it. > > Thanks, > > *From: *sfc > on > behalf of "Kent Leung (kleung)" > > *Date: *Monday, July 17, 2017 at 10:36 AM > *To: *Dave Dolson >, > "Roberta Maglione (robmgl)" >, James N Guichard > > > *Cc: *"sfc@ietf.org " > > *Subject: *Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Why can’t there be stats for per SPI and more granular stats for per > SPI/SI? They seem to serve different purposes. The former is providing > counters for all flows in each service path. The latter is provide > counters for all flows served at each hop in the service path. > > Can you explain the “spiral†scenario and how that pertains to > usefulness of having per service path stats? Thanks. > > Kent > > *From:* Dave Dolson [mailto:ddolson@sandvine.com] > *Sent:* Monday, July 17, 2017 3:01 PM > *To:* Roberta Maglione (robmgl) >; James N Guichard > > > *Cc:* Kent Leung (kleung) >; > sfc@ietf.org > *Subject:* RE: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Strictly, stats should be per SPI and SI, in order to support the > so-called spiral. > > But I can see how folks might find the lazy implementation to be useful. > > *From:*Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] > *Sent:* Monday, July 17, 2017 11:00 AM > *To:* James N Guichard > *Cc:* Dave Dolson; Kent Leung (kleung); sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > I agree on the operational aspect: having different SPI's for each > direction simplifies the troubleshooting procedures, as statistics on > the packets counters for each direction on each SF, can be displayed > just based on SPI. > > Regards, > > Roberta > > Inviato da iPad > > > Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > > ha > scritto: > > Yes understood but I was assuming no manipulation of the SI and my > point was more from an operational perspective; if I use the same > path ID in both directions then I cannot immediately tell in which > direction the packets are flowing unless I go one step deeper and > look at the SI leading to a correlation of SPI + SI to be able to > figure out my traffic matrix. Not so if the SPI is uni-directional. > > Jim > > *From:* Dave Dolson [mailto:ddolson@sandvine.com] > *Sent:* Friday, July 14, 2017 2:51 PM > *To:* James N Guichard >; Kent Leung (kleung) > >; sfc@ietf.org > > *Subject:* RE: clarification on Service Path ID for > draft-penno-sfc-packet > > There is not actually forwarding ambiguity, since SFF forwarding > depends on **both** SPI and SI. > > So for example, there is no ambiguity in forwarding to use SI in the > range [0,127] of up-link and range [128,255] for down-link, on the > same SPI. > > The limitation is ~127 SFs per path instead of ~255. > > As I see it, Kent’s question is one of aesthetics. Do folks like the > same SPI used for two directions? > > Personally, I find use of a single SPI to be more elegant, > consuming only one path ID instead of two. (section 5.4.1). > > It may make debugging easier as well. > > Also, for what it’s worth, we demonstrated this method of section > 5.4.1 at a previous IETF hackathon. > > -Dave > > *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N Guichard > *Sent:* Friday, July 14, 2017 2:25 PM > *To:* Kent Leung (kleung); sfc@ietf.org > *Subject:* Re: [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi Kent, > > [personal opinion …] I have always assumed that the service path ID > would be uni-directional given that it would be difficult to avoid > collision in all forwarding scenarios. If you look at a basic SFC > a-b-c and the service index is set to 255 at the classifiers a & c > (which imho will be the normal practice) then at b you would have a > conflict if the same service path ID is used in both directions. > > Jim > > *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung > (kleung) > *Sent:* Friday, July 14, 2017 1:58 PM > *To:* sfc@ietf.org > *Subject:* [sfc] clarification on Service Path ID for > draft-penno-sfc-packet > > Hi. We are working on a revision for this draft. There were 4 > proposed solution options in section 5. During some discussions, > most folks seem to favor the use of algorithmic method in section > 5.4. However, there are 2 sub-options. One is based on same Service > Path ID and using Service Index to determine flow direction (sect. > 5.4.1). The other is based on setting high order bit on Serve Path > ID, which determines flow direction (sect. 5.4.2). There are mixed > opinions. One reason is that there may be the assumption the Service > Path ID is uni-directional. No explicit wording of that nature has > been encountered in the RFCs, maybe we missed something? > > If Serve Path ID is required to be uni-directional, then the answer > is easy (=> 5.4.2). We would like to solicit WG comments to get > rough consensus and revised the next version with that solution. > This problem is critical to address for Service Function that > generate packet in reverse direction, especially security service > functions as mentioned in draft-wang-sfc-ns-use-cases. > > Thanks. > > Kent > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Tue Jul 18 07:11:42 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E119131B09 for ; Tue, 18 Jul 2017 07:11:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.601 X-Spam-Level: X-Spam-Status: No, score=-2.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AxXfJ7CnndvD for ; Tue, 18 Jul 2017 07:11:37 -0700 (PDT) Received: from hub021-ca-1.exch021.serverdata.net (hub021-ca-1.exch021.serverdata.net [64.78.22.168]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E506D1317C3 for ; Tue, 18 Jul 2017 07:11:37 -0700 (PDT) Received: from MBX021-W3-CA-2.exch021.domain.local ([10.254.4.78]) by HUB021-CA-1.exch021.domain.local ([10.254.4.30]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 07:11:37 -0700 From: Ron Parker To: "Joel M. Halpern" , "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , "Dave Dolson" , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACIKd4AAAhrTgAAAUD4AAAAxu6AACekloAABb+SAAAE3CsAAA5wt1A= Date: Tue, 18 Jul 2017 14:11:36 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> In-Reply-To: <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [50.203.66.100] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 14:11:40 -0000 R29vZCBwb2ludCBvbiB0aGUgb3B0aW9uYWxpdHkgb2YgdGhpcyBiaWRpcmVjdGlvbmFsIGNvbmNl cHQuDQoNCkZvciB0aGUgYmlkaXJlY3Rpb25hbCBjYXNlLCB3ZSB3b3VsZCB1bHRpbWF0ZWx5IGxp a2UgdG8ga25vdyB0aGUgY29ycmVsYXRpb24gb2YgdGhlIDIgcGF0aHMuICAgIEknbSB0aGlua2lu ZyB0aGF0IHRoaXMgaXMgbW9yZSwgZXZlbiwgdGhhbiBjb3JyZWxhdGluZyB0aGUgImZvcndhcmQi IFNQSSBhbmQgdGhlICJyZXZlcnNlIiBTUEkuICAgSXQgYWxzbyBiZWNvbWVzIHVzZWZ1bCB0byBj b3JyZWxhdGUgdGhlIHBvc2l0aW9uIG9mIGEgcGFydGljdWxhciBzZXJ2aWNlIGZ1bmN0aW9uLiAg IEEgc3RyaWN0IHByZXN1bXB0aW9uIG9mIG1pcnJvcmVkIG9yZGVyIGZvciB0aGUgMiBkaXJlY3Rp b25zIGRvZXMgbm90IGFsd2F5cyBob2xkLiAgIExldHMgc2F5IGluIHRoZSBmb3J3YXJkIGRpcmVj dGlvbiB3ZSB3YW50IFNGIHR5cGVzIEEsIEIsIEMsIEQgYnV0IGluIHRoZSByZXZlcnNlIGRpcmVj 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verify=FAIL); Tue, 18 Jul 2017 23:34:13 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 18 Jul 2017 19:34:12 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Tue, 18 Jul 2017 19:34:12 -0400 From: "Carlos Pignataro (cpignata)" To: "Andrew G. Malis" CC: Adrian Farrel , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgAKt1SAABV6vl0= Date: Tue, 18 Jul 2017 23:34:12 +0000 Message-ID: <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com> References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: multipart/alternative; boundary="_000_9CEFFC29C6CD4F1797A63FB4CD6A236Eciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 23:34:17 -0000 --_000_9CEFFC29C6CD4F1797A63FB4CD6A236Eciscocom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Thanks Adrian, Andy, and Dave! Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates: 1. Specify protocol 0x0 is unassigned instead of reserved. This is so that = other document can define it. 1.5. Will not merge in Protocol =3D 0. That should be advanced via Adrian's= draft, just as any other protocol support allocation, assignment, and spec= ification. 2. Add that "unknown protocol ids SHOULD be silently dropped", clarifying t= hat behavior. 3. Allow different MD Type in a single SFP, like: "NSH does not disallow it= , but such functionality would need to be explicitly specified." 4. Will update the IANA numbers to hex 5. Will change The should not process to SHOULD be drop for experimental pr= otocols. That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. Sent from my iPad On Jul 18, 2017, at 11:19 AM, Andrew G. Malis > wrote: Adrian, Two comments. 1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 and 2= 55 in the IANA considerations. We should pick one or the other, and have it= the same at both places (I don=92t have a particular preference). 2. Does the text: An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =93NOT attempt to process= =94 actually means. Thanks, Andy On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel > wrote: Hi, As we have been discussing we need to describe what implementations should = do with unknown "Next Protocol" values. We also need to not block the future u= se of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph o= f 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_9CEFFC29C6CD4F1797A63FB4CD6A236Eciscocom_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Thanks Adrian, Andy, and Dave!

Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates:

1. Specify p= rotocol 0x0 is unassigned instead of reserved. This is so that other docume= nt can define it. 
1.5. Will no= t merge in Protocol =3D 0. That should be advanced via Adrian's draft, just= as any other protocol support allocation, assignment, and specification.&n= bsp;
2. Add that "unknown protocol ids SHOULD be silently dropped", cl= arifying that behavior. 
3. Allow different MD Type in a single SFP, like: "NSH does not disall= ow it, but such functionality would need to be explicitly specified."<= /span>
4. Will update the IANA numbers to hex
5. Will change The should not process to SHOULD be drop for experiment= al protocols. 

That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. 

Sent from my iPad

On Jul 18, 2017, at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> wrote:

Adrian,

Two comments.

1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 = and 255 in the IANA considerations. We should pick one or the other, and ha= ve it the same at both places (I don=92t have a particular preference).

2. Does the text:

   An impleme= ntation not explicitly configured for a specific experiment
   [RFC3692] SHOUL= D NOT attempt to process Next Protocol values 0xFE and
   0xFF.
mean drop or forward? We should be explicit what =93NOT attempt to pro= cess=94 actually means.

Thanks,
Andy


On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel <= span dir=3D"ltr"> <adrian@olddog.= co.uk> wrote:
Hi,

As we have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not block th= e future use of
0x0 (which we might want for "none").

I think we need the following two changes. My words in the last paragraph o= f 2.2
seem excessive and I would be happy to see them reduced.

(Note that a couple of typos are also fixed in the changed text.)

Adrian

---

Section 2.2
OLD
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x0: Reserved
   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.
NEW
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.

   An implementation that does not recognize the Next Protocol va= lue
   SHOULD NOT attempt to examine or process the payload of a pack= et.
   The meaning of this will depend on the role of a component wit= hin the
   SFC system.  For example, an SFF may be able to forward a= n NSH packet
   without reference to the payload, but an SF applies a function= to the
   payload and so might be expected to understand the Next Protoc= ol type.
   By default, an implementation that needs to look at the payloa= d of an
   NSH packet MUST drop packets with unknown Next Protocol, but t= his
   behavior SHOULD be configurable.
END

---

11.2.5

OLD
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
NEW
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
END

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.iet= f.org/mailman/listinfo/sfc
--_000_9CEFFC29C6CD4F1797A63FB4CD6A236Eciscocom_-- From nobody Tue Jul 18 17:13:59 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id DCEF0129B06; Tue, 18 Jul 2017 17:13:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.56.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150042323786.25205.9560768442216494294@ietfa.amsl.com> Date: Tue, 18 Jul 2017 17:13:57 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-15.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 00:13:58 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining of the IETF. Title : Network Service Header (NSH) Authors : Paul Quinn Uri Elzur Carlos Pignataro Filename : draft-ietf-sfc-nsh-15.txt Pages : 32 Date : 2017-07-18 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-15 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-15 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-15 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Jul 18 19:48:04 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D38CC12783A for ; Tue, 18 Jul 2017 19:48:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PFO6SpENSfCs for ; Tue, 18 Jul 2017 19:48:01 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F2814127010 for ; Tue, 18 Jul 2017 19:48:00 -0700 (PDT) Received: from BLR-EXCHP-2.sandvine.com (192.168.196.172) by WTL-EXCHP-3.sandvine.com (192.168.196.177) with Microsoft SMTP Server (TLS) id 14.3.319.2; Tue, 18 Jul 2017 22:47:58 -0400 Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by blr-exchp-2.sandvine.com ([::1]) with mapi id 14.03.0319.002; Tue, 18 Jul 2017 22:47:57 -0400 From: Dave Dolson To: "Carlos Pignataro (cpignata)" , "Andrew G. Malis" CC: Adrian Farrel , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgAKt1SAABV6vl0ABsQbOw== Date: Wed, 19 Jul 2017 02:47:56 +0000 Message-ID: <20170719024755.5103687.27405.24230@sandvine.com> References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk>, , <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com> In-Reply-To: <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: multipart/alternative; boundary="_000_2017071902475551036872740524230sandvinecom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 02:48:04 -0000 --_000_2017071902475551036872740524230sandvinecom_ Content-Type: text/plain; charset="windows-1256" Content-Transfer-Encoding: quoted-printable Can 2 be "SHOULD be dropped by default but MAY be configured to =FDforward"= ? Or is that obvious? David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Wednesday, July 19, 2017 1:34 AM To: Andrew G. Malis Cc: Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol Thanks Adrian, Andy, and Dave! Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates: 1. Specify protocol 0x0 is unassigned instead of reserved. This is so that = other document can define it. 1.5. Will not merge in Protocol =3D 0. That should be advanced via Adrian's= draft, just as any other protocol support allocation, assignment, and spec= ification. 2. Add that "unknown protocol ids SHOULD be silently dropped", clarifying t= hat behavior. 3. Allow different MD Type in a single SFP, like: "NSH does not disallow it= , but such functionality would need to be explicitly specified." 4. Will update the IANA numbers to hex 5. Will change The should not process to SHOULD be drop for experimental pr= otocols. That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. Sent from my iPad On Jul 18, 2017, at 11:19 AM, Andrew G. Malis > wrote: Adrian, Two comments. 1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 and 2= 55 in the IANA considerations. We should pick one or the other, and have it= the same at both places (I don=92t have a particular preference). 2. Does the text: An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =93NOT attempt to process= =94 actually means. Thanks, Andy On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel > wrote: Hi, As we have been discussing we need to describe what implementations should = do with unknown "Next Protocol" values. We also need to not block the future u= se of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph o= f 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_2017071902475551036872740524230sandvinecom_ Content-Type: text/html; charset="windows-1256" Content-Transfer-Encoding: quoted-printable
David Dolson
Sandvine
From: Carlos Pignataro (cpignata)
Sent: Wednesday, July 19, 2017 1:34 AM
To: Andrew G. Malis
Cc: Adrian Farrel; sfc@ietf.org
Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol

Thanks Adrian, Andy, and Dave!

Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates:

1. Specify protocol 0x0 is unassigned instead of rese= rved. This is so that other document can define it. 
1.5. Will not merge in Protocol =3D 0. That should be= advanced via Adrian's draft, just as any other protocol support allocation= , assignment, and specification. 
2. Add that "unknown protocol ids SHOULD be silently dropped", cl= arifying that behavior. 
3. Allow different MD Type in a single SFP, like: "NSH does not disall= ow it, but such functionality would need to be explicitly specified."<= /span>
4. Will update the IANA numbers to hex
5. Will change The should not process to SHOULD be drop for experiment= al protocols. 

That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. 

Sent from my iPad

On Jul 18, 2017, at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> wrote:

Adrian,

Two comments.

1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 = and 255 in the IANA considerations. We should pick one or the other, and ha= ve it the same at both places (I don=92t have a particular preference).

2. Does the text:

   An impleme= ntation not explicitly configured for a specific experiment
   [RFC3692] SHOUL= D NOT attempt to process Next Protocol values 0xFE and
   0xFF.
mean drop or forward? We should be explicit what =93NOT attempt to pro= cess=94 actually means.

Thanks,
Andy


On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel <= span dir=3D"ltr"> <adrian@olddog.= co.uk> wrote:
Hi,

As we have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not block th= e future use of
0x0 (which we might want for "none").

I think we need the following two changes. My words in the last paragraph o= f 2.2
seem excessive and I would be happy to see them reduced.

(Note that a couple of typos are also fixed in the changed text.)

Adrian

---

Section 2.2
OLD
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x0: Reserved
   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.
NEW
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.

   An implementation that does not recognize the Next Protocol va= lue
   SHOULD NOT attempt to examine or process the payload of a pack= et.
   The meaning of this will depend on the role of a component wit= hin the
   SFC system.  For example, an SFF may be able to forward a= n NSH packet
   without reference to the payload, but an SF applies a function= to the
   payload and so might be expected to understand the Next Protoc= ol type.
   By default, an implementation that needs to look at the payloa= d of an
   NSH packet MUST drop packets with unknown Next Protocol, but t= his
   behavior SHOULD be configurable.
END

---

11.2.5

OLD
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
NEW
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
END

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.iet= f.org/mailman/listinfo/sfc
--_000_2017071902475551036872740524230sandvinecom_-- From nobody Wed Jul 19 00:40:13 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 405C0131C06 for ; Wed, 19 Jul 2017 00:40:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HcIDb3LJ6e34 for ; Wed, 19 Jul 2017 00:40:04 -0700 (PDT) Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6D449131BFE for ; Wed, 19 Jul 2017 00:39:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=26544; q=dns/txt; s=iport; t=1500449997; x=1501659597; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=iDu/5W09/4qiEQ9llJ/4oF90qIrbZ16V3OuyLorn6Ms=; b=ggfP+noHlDdbpBESoXS6ZABzMz6SRinqq6LYu4vxlLDKNAktImt0PlYP JCGiejL9k4N7b/ccNZrLpLCEcZJpKKkY2h1SUrnSDXoYWV8n4v3fmj1TJ Y8rGNUeGvthgNck9YxVprBz5dThoLVAuMdOsvDqenpT7kCSyoK+tpM2i8 k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAA1DG9Z/5ldJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm9rZIEUjguRYXSHOo1WghEhAQqFGwKDVz8YAQIBAQEBAQEBayi?= =?us-ascii?q?FGAEBAQEDAQFpAwsQAgEIDgMEAQEhBwchBgsUCQgBAQQOBYlLTAMVELEzhzQNg?= =?us-ascii?q?0YBAQEBAQEBAQEBAQEBAQEBAQEBAQEYBYMog02BYSuCRTSCV4JJgw2CMQWJXY1?= =?us-ascii?q?nhzo7Ao8nhHCCDIVPilSJR4JFiU8BHzg/S3UVSRIBhEeCPHaIUwEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,380,1496102400"; d="scan'208,217";a="457138447" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by alln-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Jul 2017 07:39:56 +0000 Received: from XCH-RTP-017.cisco.com (xch-rtp-017.cisco.com [64.101.220.157]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id v6J7duKs012633 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 19 Jul 2017 07:39:56 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 19 Jul 2017 03:39:55 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Wed, 19 Jul 2017 03:39:55 -0400 From: "Carlos Pignataro (cpignata)" To: Dave Dolson CC: "Andrew G. Malis" , Adrian Farrel , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgAKt1SAABV6vl0ABsQbOwAKMoYM Date: Wed, 19 Jul 2017 07:39:55 +0000 Message-ID: References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk>, , <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com>, <20170719024755.5103687.27405.24230@sandvine.com> In-Reply-To: <20170719024755.5103687.27405.24230@sandvine.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: multipart/alternative; boundary="_000_A69D865EB70844CFB5850C0FA8F47E0Cciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 07:40:07 -0000 --_000_A69D865EB70844CFB5850C0FA8F47E0Cciscocom_ Content-Type: text/plain; charset="windows-1256" Content-Transfer-Encoding: quoted-printable Thanks Dave. I think it is implicit in the SHOULD -- we recommend a behavio= r but there may be valid reasons to do something different, with appropriat= e reflection about potential consequences. Sent from my iPad On Jul 19, 2017, at 4:48 AM, Dave Dolson > wrote: Can 2 be "SHOULD be dropped by default but MAY be configured to =FDforward"= ? Or is that obvious? David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Wednesday, July 19, 2017 1:34 AM To: Andrew G. Malis Cc: Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol Thanks Adrian, Andy, and Dave! Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates: 1. Specify protocol 0x0 is unassigned instead of reserved. This is so that = other document can define it. 1.5. Will not merge in Protocol =3D 0. That should be advanced via Adrian's= draft, just as any other protocol support allocation, assignment, and spec= ification. 2. Add that "unknown protocol ids SHOULD be silently dropped", clarifying t= hat behavior. 3. Allow different MD Type in a single SFP, like: "NSH does not disallow it= , but such functionality would need to be explicitly specified." 4. Will update the IANA numbers to hex 5. Will change The should not process to SHOULD be drop for experimental pr= otocols. That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. Sent from my iPad On Jul 18, 2017, at 11:19 AM, Andrew G. Malis > wrote: Adrian, Two comments. 1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 and 2= 55 in the IANA considerations. We should pick one or the other, and have it= the same at both places (I don=92t have a particular preference). 2. Does the text: An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =93NOT attempt to process= =94 actually means. Thanks, Andy On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel > wrote: Hi, As we have been discussing we need to describe what implementations should = do with unknown "Next Protocol" values. We also need to not block the future u= se of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph o= f 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_A69D865EB70844CFB5850C0FA8F47E0Cciscocom_ Content-Type: text/html; charset="windows-1256" Content-Transfer-Encoding: quoted-printable
Thanks Dave. I think it is implicit in the SHOULD -- we recommend a be= havior but there may be valid reasons to do something different, with appro= priate reflection about potential consequences. 

Sent from my iPad

On Jul 19, 2017, at 4:48 AM, Dave Dolson <ddolson@sandvine.com> wrote:

David Dolson
Sandvine
From: Carlos Pignataro (cpignata)
Sent: Wednesday, July 19, 2017 1:34 AM
To: Andrew G. Malis
Cc: Adrian Farrel; sfc@ietf.org=
Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol

Thanks Adrian, Andy, and Dave!

Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates:

1. Specify protocol 0x0 is unassigned instead of rese= rved. This is so that other document can define it. 
1.5. Will not merge in Protocol =3D 0. That should be= advanced via Adrian's draft, just as any other protocol support allocation= , assignment, and specification. 
2. Add that "unknown protocol ids SHOULD be silently dropped", cl= arifying that behavior. 
3. Allow different MD Type in a single SFP, like: "NSH does not disall= ow it, but such functionality would need to be explicitly specified."<= /span>
4. Will update the IANA numbers to hex
5. Will change The should not process to SHOULD be drop for experiment= al protocols. 

That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. 

Sent from my iPad

On Jul 18, 2017, at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> wrote:

Adrian,

Two comments.

1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 = and 255 in the IANA considerations. We should pick one or the other, and ha= ve it the same at both places (I don=92t have a particular preference).

2. Does the text:

   An impleme= ntation not explicitly configured for a specific experiment
   [RFC3692] SHOUL= D NOT attempt to process Next Protocol values 0xFE and
   0xFF.
mean drop or forward? We should be explicit what =93NOT attempt to pro= cess=94 actually means.

Thanks,
Andy


On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel <= span dir=3D"ltr"> <adrian@olddog.= co.uk> wrote:
Hi,

As we have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not block th= e future use of
0x0 (which we might want for "none").

I think we need the following two changes. My words in the last paragraph o= f 2.2
seem excessive and I would be happy to see them reduced.

(Note that a couple of typos are also fixed in the changed text.)

Adrian

---

Section 2.2
OLD
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x0: Reserved
   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.
NEW
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.

   An implementation that does not recognize the Next Protocol va= lue
   SHOULD NOT attempt to examine or process the payload of a pack= et.
   The meaning of this will depend on the role of a component wit= hin the
   SFC system.  For example, an SFF may be able to forward a= n NSH packet
   without reference to the payload, but an SF applies a function= to the
   payload and so might be expected to understand the Next Protoc= ol type.
   By default, an implementation that needs to look at the payloa= d of an
   NSH packet MUST drop packets with unknown Next Protocol, but t= his
   behavior SHOULD be configurable.
END

---

11.2.5

OLD
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
NEW
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
END

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.iet= f.org/mailman/listinfo/sfc
--_000_A69D865EB70844CFB5850C0FA8F47E0Cciscocom_-- From nobody Wed Jul 19 01:10:05 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 87CFB131C1D for ; Wed, 19 Jul 2017 01:10:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yAtERYyOms09 for ; Wed, 19 Jul 2017 01:10:01 -0700 (PDT) Received: from asmtp2.iomartmail.com (asmtp2.iomartmail.com [62.128.201.249]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A664713167A for ; Wed, 19 Jul 2017 01:10:00 -0700 (PDT) Received: from asmtp2.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6J89sgF020987; Wed, 19 Jul 2017 09:09:54 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6J89rj0020963 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 19 Jul 2017 09:09:54 +0100 Reply-To: From: "Adrian Farrel" To: "'Carlos Pignataro \(cpignata\)'" , "'Dave Dolson'" Cc: "'Andrew G. Malis'" , References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk>, , <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com>, <20170719024755.5103687.27405.24230@sandvine.com> In-Reply-To: Date: Wed, 19 Jul 2017 09:09:51 +0100 Message-ID: <087101d30066$666e5f90$334b1eb0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0872_01D3006E.C83A41A0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJ3gtpwgzHy2VAzkzI0ZJPhMDOLfwHG90CfAs/FozoCH+548wCY9BiYoNdD9OA= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23204.005 X-TM-AS-Result: No--20.320-10.0-31-10 X-imss-scan-details: No--20.320-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO2rk4SVjTOUqpU7Bltw5qVLpLOv1YSZntxGr8G3v23M3wLy tDvV39h+wxQlas2GDmj2mhGQByUXXkMpVZZsZyZGaDCzqDR7DPYS12tj9Zvd82yZJ8/t392lWXO j3NIpqIoWKPSEuNjLlAewcPcweqB27snSIDyG3GWzLD5kmcW6ZAiN6fibvJqqnVnosx8aF2tAPN HJ6d1lG++XufC1NupLlhEPkSRcxngzAxrwU7pk2lz+axQLnAVBXs5nqGvDCfONTnqOMBIJ4eB8O deiJ2JqJTzjOLcnfHKYtTlTMN2RRxKwwliN4mNuo4Ef+Wmk9x3uHZGuwo6K7Rg+C+mOIAG2QbNT sIpfWx16lh0OR8iK+upLdnDhhPIaiyOaUzKo3m9+NQIFduF53xyDrkIwjihbDO+DX+rUwfYGk2p TPAu+96ayUkjRauIj3MKvpIm7JkC6xzoOJMBt8S4uTw19Klh6LJm8FOE9WLV03GAz54To+6vDNb XRWSqPGD/In+je5Df1VmTZnVKT+BSF8L+KnNGTqbg9uWhLYLf2kudi1D33ErJ3rmpkUU+TJ8H95 H5rK0M22uoEm245foFaNaPuEIbSqg73pN+Zqlyd27eF5UDFow/i8FY2vTOBIDp4740OYDElncPT Mo+HsfXTJA26jU4l6ildM8G2P0E/Btxv8I1Q6XC8PJ2EFS7IIBcsXIuEvlbkZ1myTXKoFyqh5cU ye3iVIm6fKcuFyK8oR0K3DJ8mwtZXwwpvfhGVFlT/KggLyj0lWygvtTclwOKYpwtG+wHVRq7NaF miCIDOQf/S1XvtEAC/b4aTkuDFizFhECDuofCeAiCmPx4NwGmRqNBHmBvegQ/HAXXglXZFGCd0S 0NCsnrGB+hdsFNS558ZJNXh+m0KGx1Byrxe5zNoTKxm6+R9aAZk0sEcY14= Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 08:10:03 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0872_01D3006E.C83A41A0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable In general, it is worth explaining the converse of the SHOULD (i.e., the = MAY) even if *we* think it is obvious. =20 This stops the ADs coming back and placing a Discuss because the = document "is not complete" =20 :-) =20 From: Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com]=20 Sent: 19 July 2017 08:40 To: Dave Dolson Cc: Andrew G. Malis; Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol =20 Thanks Dave. I think it is implicit in the SHOULD -- we recommend a = behavior but there may be valid reasons to do something different, with appropriate reflection about potential consequences.=20 Sent from my iPad On Jul 19, 2017, at 4:48 AM, Dave Dolson wrote: Can 2 be "SHOULD be dropped by default but MAY be configured to = =FDforward"? Or is that obvious? =20 =20 David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Wednesday, July 19, 2017 1:34 AM To: Andrew G. Malis Cc: Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol =20 Thanks Adrian, Andy, and Dave! Closing the loop on all these points, as well as next steps for the NSH = doc, planned updates: =20 1. Specify protocol 0x0 is unassigned instead of reserved. This is so = that other document can define it.=20 1.5. Will not merge in Protocol =3D 0. That should be advanced via = Adrian's draft, just as any other protocol support allocation, assignment, and = specification.=20 2. Add that "unknown protocol ids SHOULD be silently dropped", = clarifying that behavior.=20 3. Allow different MD Type in a single SFP, like: "NSH does not disallow = it, but such functionality would need to be explicitly specified." 4. Will update the IANA numbers to hex 5. Will change The should not process to SHOULD be drop for experimental protocols.=20 That's the scope of plan changes. All good useful things, though we have = entered the diminishing returns territory.=20 Sent from my iPad On Jul 18, 2017, at 11:19 AM, Andrew G. Malis wrote: Adrian,=20 =20 Two comments. =20 1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 = and 255 in the IANA considerations. We should pick one or the other, and have it = the same at both places (I don=92t have a particular preference). =20 2. Does the text: =20 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =93NOT attempt to = process=94 actually means. =20 Thanks, Andy =20 =20 On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel = wrote: Hi, As we have been discussing we need to describe what implementations = should do with unknown "Next Protocol" values. We also need to not block the = future use of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last = paragraph of 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol = type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc =20 _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc ------=_NextPart_000_0872_01D3006E.C83A41A0 Content-Type: text/html; charset="windows-1255" Content-Transfer-Encoding: quoted-printable

In general, it is worth = explaining the converse of the SHOULD (i.e., the MAY) even if *we* think = it is obvious.

 

This stops the ADs coming back = and placing a Discuss because the document "is not = complete"

 

:-)

 

From: Carlos Pignataro = (cpignata) [mailto:cpignata@cisco.com]
Sent: 19 July 2017 = 08:40
To: Dave Dolson
Cc: Andrew G. Malis; Adrian = Farrel; sfc@ietf.org
Subject: Re: [sfc] Update to NSH spec - = Unknown Next Protocol

 

Thanks Dave. I think = it is implicit in the SHOULD -- we recommend a behavior but there may be = valid reasons to do something different, with = appropriate reflection about potential = consequences. 


Sent from my = iPad


On Jul 19, 2017, = at 4:48 AM, Dave Dolson <ddolson@sandvine.com> = wrote:

Can 2 be "SHOULD be dropped by default = but MAY be configured to =FDforward"? Or is that = obvious?

 

 

David Dolson
Sandvine

=

From: Carlos Pignataro = (cpignata)

Sent: Wednesday, July 19, 2017 1:34 = AM

To: Andrew G. = Malis

Cc: Adrian Farrel; sfc@ietf.org

=

Subject: Re: [sfc] Update to NSH spec - Unknown = Next Protocol

 

Thanks Adrian, Andy, and Dave!

Closing the loop on all = these points, as well as next steps for the NSH doc, planned = updates:

 

1. Specify protocol 0x0 is unassigned instead of reserved. This = is so that other document can define = it. 

1.5. Will not merge = in Protocol =3D 0. That should be advanced via Adrian's draft, just as = any other protocol support allocation, assignment, and = specification. 
2. Add that "unknown protocol ids SHOULD be = silently dropped", clarifying that behavior. 
3. Allow = different MD Type in a single SFP, like: "NSH does not disallow it, = but such functionality would need to be explicitly = specified."

4. Will update the IANA numbers to = hex

5. Will change The = should not process to SHOULD be drop for experimental = protocols. 

That's the scope of plan changes. All good = useful things, though we have entered the diminishing returns = territory. 

Sent from my = iPad


On Jul 18, 2017, = at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> = wrote:

Adrian,

 

Two comments.

 

1. It=92s inconsistent to use 0xFE and 0xFF in the main text, = but 254 and 255 in the IANA considerations. We should pick one or the = other, and have it the same at both places (I don=92t have a particular = preference).

 

2. Does the text:

 

   An implementation not explicitly configured for a = specific experiment
   [RFC3692] SHOULD NOT attempt to = process Next Protocol values 0xFE and
   0xFF.

mean drop or = forward? We should be explicit what =93NOT attempt to process=94 = actually means.

 

Thanks,

Andy

 

 

On Tue, Jul 18, 2017 = at 4:12 AM, Adrian Farrel <adrian@olddog.co.uk> = wrote:

Hi,

As we = have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not = block the future use of
0x0 (which we might want for = "none").

I think we need the following two changes. My = words in the last paragraph of 2.2
seem excessive and I would be = happy to see them reduced.

(Note that a couple of typos are also = fixed in the changed text.)

Adrian

---

Section = 2.2
OLD
   Next Protocol: indicates the protocol type of = the encapsulated data.
   NSH does not alter the inner = payload, and the semantics on the inner
   protocol remain = unchanged due to NSH service function chaining.
   Please = see the IANA Considerations section below, Section 11.2.5.

  =  This document defines the following Next Protocol = values:

   0x0: Reserved
   0x1: = IPv4
   0x2: IPv6
   0x3: Ethernet
  =  0x4: NSH
   0x5: MPLS
   0xFE: = Experiment 1
   0xFF: Experiment 2

   An = implementation not explicitly configured for a specific = experiment
   [RFC3692] SHOULD NOT attempt to process Next = Protocol values 0xFE and
   0xFF.
NEW
  =  Next Protocol: indicates the protocol type of the encapsulated = data.
   NSH does not alter the inner payload, and the = semantics on the inner
   protocol remain unchanged due to = NSH service function chaining.
   Please see the IANA = Considerations section below, Section 11.2.5.

   This = document defines the following Next Protocol values:

  =  0x1: IPv4
   0x2: IPv6
   0x3: = Ethernet
   0x4: NSH
   0x5: MPLS
  =  0xFE: Experiment 1
   0xFF: Experiment = 2

   An implementation not explicitly configured for a = specific experiment
   [RFC3692] SHOULD NOT attempt to = process Next Protocol values 0xFE and
  =  0xFF.

   An implementation that does not = recognize the Next Protocol value
   SHOULD NOT attempt to = examine or process the payload of a packet.
   The meaning = of this will depend on the role of a component within the
  =  SFC system.  For example, an SFF may be able to forward an = NSH packet
   without reference to the payload, but an SF = applies a function to the
   payload and so might be = expected to understand the Next Protocol type.
   By = default, an implementation that needs to look at the payload of = an
   NSH packet MUST drop packets with unknown Next = Protocol, but this
   behavior SHOULD be = configurable.
END

---

11.2.5

OLD
  =  IANA is requested to set up a registry of "Next = Protocol".  These are
   8-bit values.  Next = Protocol values 1, 2, 3, 4, and 5 are defined
   in this = document (see Table 7).  New values are assigned via = "Expert
   Review" as per = [RFC8126].

            =  +---------------+--------------+---------------+
    =          | Next Protocol | Description  | = Reference     |
          =    +---------------+--------------+---------------+
  =            | 0        =      | Unassigned   |      =          |
        =      |              =  |              |    =            |
      =        | 1            =  | IPv4         | This document = |
             |    =            |        =       |              =  |
             | 2  =            | IPv6      =    | This document |
          =    |              =  |              |    =            |
      =        | 3            =  | Ethernet     | This document |
    =          |          =      |              = |               |
  =            | 4        =      | NSH          | This = document |
             |  =              |      =         |            =    |
             | = 5             | MPLS    =      | This document |
        =      |              =  |              |    =            |
      =        | 6..253        | = Unassigned   |              =  |
             |  =              |      =         |            =    |
             | = 254           | Experiment 1 | This = document |
             |  =              |      =         |            =    |
             | = 255           | Experiment 2 | This = document |
            =  +---------------+--------------+---------------+

  =              Table 7: NSH Base Header = Next Protocol Values
NEW
   IANA is requested to set up = a registry of "Next Protocol".  These are
  =  8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are = defined
   in this document (see Table 7).  New values = are assigned via "Expert
   Review" as per = [RFC8126].

            =  +---------------+--------------+---------------+
    =          | Next Protocol | Description  | = Reference     |
          =    +---------------+--------------+---------------+
  =            | 0        =      | Unassigned   |      =          |
        =      |              =  |              |    =            |
      =        | 1            =  | IPv4         | This document = |
             |    =            |        =       |              =  |
             | 2  =            | IPv6      =    | This document |
          =    |              =  |              |    =            |
      =        | 3            =  | Ethernet     | This document |
    =          |          =      |              = |               |
  =            | 4        =      | NSH          | This = document |
             |  =              |      =         |            =    |
             | = 5             | MPLS    =      | This document |
        =      |              =  |              |    =            |
      =        | 6..253        | = Unassigned   |              =  |
             |  =              |      =         |            =    |
             | = 254           | Experiment 1 | This = document |
             |  =              |      =         |            =    |
             | = 255           | Experiment 2 | This = document |
            =  +---------------+--------------+---------------+

  =              Table 7: NSH Base Header = Next Protocol = Values
END

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sfc@ietf.org
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_______________________________________________
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https://www.ietf.org/m= ailman/listinfo/sfc

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Halpern" , "Reinaldo Penno (repenno)" , "Dave Dolson" , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEA== Date: Wed, 19 Jul 2017 08:29:40 +0000 Message-ID: <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.42.52] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 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with HTTP; Wed, 19 Jul 2017 03:34:04 -0700 (PDT) In-Reply-To: <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com> References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk> <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com> From: "Andrew G. Malis" Date: Wed, 19 Jul 2017 06:34:04 -0400 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a113ce0f8ff2a690554a92c4b" Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 10:34:28 -0000 --001a113ce0f8ff2a690554a92c4b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Carlos, -15 takes care of my comments, thanks! Cheers, Andy On Tue, Jul 18, 2017 at 7:34 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Thanks Adrian, Andy, and Dave! > > Closing the loop on all these points, as well as next steps for the NSH > doc, planned updates: > > 1. Specify protocol 0x0 is unassigned instead of reserved. This is so tha= t > other document can define it. > 1.5. Will not merge in Protocol =3D 0. That should be advanced via Adrian= 's > draft, just as any other protocol support allocation, assignment, and > specification. > 2. Add that "unknown protocol ids SHOULD be silently dropped", clarifying > that behavior. > 3. Allow different MD Type in a single SFP, like: "NSH does not disallow > it, but such functionality would need to be explicitly specified." > 4. Will update the IANA numbers to hex > 5. Will change The should not process to SHOULD be drop for experimental > protocols. > > That's the scope of plan changes. All good useful things, though we have > entered the diminishing returns territory. > > Sent from my iPad > > On Jul 18, 2017, at 11:19 AM, Andrew G. Malis wrote: > > Adrian, > > Two comments. > > 1. It=E2=80=99s inconsistent to use 0xFE and 0xFF in the main text, but 2= 54 and > 255 in the IANA considerations. We should pick one or the other, and have > it the same at both places (I don=E2=80=99t have a particular preference)= . > > 2. Does the text: > > An implementation not explicitly configured for a specific experiment > [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and > 0xFF. > > mean drop or forward? We should be explicit what =E2=80=9CNOT attempt to = process=E2=80=9D > actually means. > > Thanks, > Andy > > > On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel > wrote: > >> Hi, >> >> As we have been discussing we need to describe what implementations >> should do >> with unknown "Next Protocol" values. We also need to not block the futur= e >> use of >> 0x0 (which we might want for "none"). >> >> I think we need the following two changes. My words in the last paragrap= h >> of 2.2 >> seem excessive and I would be happy to see them reduced. >> >> (Note that a couple of typos are also fixed in the changed text.) >> >> Adrian >> >> --- >> >> Section 2.2 >> OLD >> Next Protocol: indicates the protocol type of the encapsulated data. >> NSH does not alter the inner payload, and the semantics on the inner >> protocol remain unchanged due to NSH service function chaining. >> Please see the IANA Considerations section below, Section 11.2.5. >> >> This document defines the following Next Protocol values: >> >> 0x0: Reserved >> 0x1: IPv4 >> 0x2: IPv6 >> 0x3: Ethernet >> 0x4: NSH >> 0x5: MPLS >> 0xFE: Experiment 1 >> 0xFF: Experiment 2 >> >> An implementation not explicitly configured for a specific experiment >> [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and >> 0xFF. >> NEW >> Next Protocol: indicates the protocol type of the encapsulated data. >> NSH does not alter the inner payload, and the semantics on the inner >> protocol remain unchanged due to NSH service function chaining. >> Please see the IANA Considerations section below, Section 11.2.5. >> >> This document defines the following Next Protocol values: >> >> 0x1: IPv4 >> 0x2: IPv6 >> 0x3: Ethernet >> 0x4: NSH >> 0x5: MPLS >> 0xFE: Experiment 1 >> 0xFF: Experiment 2 >> >> An implementation not explicitly configured for a specific experiment >> [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and >> 0xFF. >> >> An implementation that does not recognize the Next Protocol value >> SHOULD NOT attempt to examine or process the payload of a packet. >> The meaning of this will depend on the role of a component within the >> SFC system. For example, an SFF may be able to forward an NSH packet >> without reference to the payload, but an SF applies a function to the >> payload and so might be expected to understand the Next Protocol type= . >> By default, an implementation that needs to look at the payload of an >> NSH packet MUST drop packets with unknown Next Protocol, but this >> behavior SHOULD be configurable. >> END >> >> --- >> >> 11.2.5 >> >> OLD >> IANA is requested to set up a registry of "Next Protocol". These are >> 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined >> in this document (see Table 7). New values are assigned via "Expert >> Review" as per [RFC8126]. >> >> +---------------+--------------+---------------+ >> | Next Protocol | Description | Reference | >> +---------------+--------------+---------------+ >> | 0 | Unassigned | | >> | | | | >> | 1 | IPv4 | This document | >> | | | | >> | 2 | IPv6 | This document | >> | | | | >> | 3 | Ethernet | This document | >> | | | | >> | 4 | NSH | This document | >> | | | | >> | 5 | MPLS | This document | >> | | | | >> | 6..253 | Unassigned | | >> | | | | >> | 254 | Experiment 1 | This document | >> | | | | >> | 255 | Experiment 2 | This document | >> +---------------+--------------+---------------+ >> >> Table 7: NSH Base Header Next Protocol Values >> NEW >> IANA is requested to set up a registry of "Next Protocol". These are >> 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined >> in this document (see Table 7). New values are assigned via "Expert >> Review" as per [RFC8126]. >> >> +---------------+--------------+---------------+ >> | Next Protocol | Description | Reference | >> +---------------+--------------+---------------+ >> | 0 | Unassigned | | >> | | | | >> | 1 | IPv4 | This document | >> | | | | >> | 2 | IPv6 | This document | >> | | | | >> | 3 | Ethernet | This document | >> | | | | >> | 4 | NSH | This document | >> | | | | >> | 5 | MPLS | This document | >> | | | | >> | 6..253 | Unassigned | | >> | | | | >> | 254 | Experiment 1 | This document | >> | | | | >> | 255 | Experiment 2 | This document | >> +---------------+--------------+---------------+ >> >> Table 7: NSH Base Header Next Protocol Values >> END >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > --001a113ce0f8ff2a690554a92c4b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Carlos,

-15 takes care of my comments, = thanks!

Cheers,
Andy


On Tue, Ju= l 18, 2017 at 7:34 PM, Carlos Pignataro (cpignata) <cpignata@cisco.com> wrote:
Thanks Adrian, Andy, and Dave!

Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates:

1. Specify protoc= ol 0x0 is unassigned instead of reserved. This is so that other document ca= n define it.=C2=A0
1.5. Will not mer= ge in Protocol =3D 0. That should be advanced via Adrian's draft, just = as any other protocol support allocation, assignment, and specification.=C2= =A0
2. Add that "unknown protocol ids SHOULD be silently dropped", cl= arifying that behavior.=C2=A0
3. Allow different MD Type in a single SFP, like: "NSH does not disall= ow it, but such functionality would need to be explicitly specified."<= /span>
4. Will update the IANA numbers to hex
5. Will change The should not process to SHOULD be drop for experiment= al protocols.=C2=A0

That's the scope of plan changes. All good useful things, though we hav= e entered the diminishing returns territory.=C2=A0

Sent from my iPad

On Jul 18, 2017, at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> wrote:

Adrian,

Two comments.

1. It=E2=80=99s inconsistent to use 0xFE and 0xFF in the main text, bu= t 254 and 255 in the IANA considerations. We should pick one or the other, = and have it the same at both places (I don=E2=80=99t have a particular pref= erence).

2. Does the text:

=C2=A0 =C2=A0An impleme= ntation not explicitly configured for a specific experiment
=C2=A0 =C2=A0[RFC3692] SHOUL= D NOT attempt to process Next Protocol values 0xFE and
=C2=A0 =C2=A00xFF.
mean drop or forward? We should be explicit what =E2=80=9CNOT attempt = to process=E2=80=9D actually means.

Thanks,
Andy


On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel <= span dir=3D"ltr"> <adrian@olddog.= co.uk> wrote:
Hi,

As we have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not block th= e future use of
0x0 (which we might want for "none").

I think we need the following two changes. My words in the last paragraph o= f 2.2
seem excessive and I would be happy to see them reduced.

(Note that a couple of typos are also fixed in the changed text.)

Adrian

---

Section 2.2
OLD
=C2=A0 =C2=A0Next Protocol: indicates the protocol type of the encapsulated= data.
=C2=A0 =C2=A0NSH does not alter the inner payload, and the semantics on the= inner
=C2=A0 =C2=A0protocol remain unchanged due to NSH service function chaining= .
=C2=A0 =C2=A0Please see the IANA Considerations section below, Section 11.2= .5.

=C2=A0 =C2=A0This document defines the following Next Protocol values:

=C2=A0 =C2=A00x0: Reserved
=C2=A0 =C2=A00x1: IPv4
=C2=A0 =C2=A00x2: IPv6
=C2=A0 =C2=A00x3: Ethernet
=C2=A0 =C2=A00x4: NSH
=C2=A0 =C2=A00x5: MPLS
=C2=A0 =C2=A00xFE: Experiment 1
=C2=A0 =C2=A00xFF: Experiment 2

=C2=A0 =C2=A0An implementation not explicitly configured for a specific exp= eriment
=C2=A0 =C2=A0[RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
=C2=A0 =C2=A00xFF.
NEW
=C2=A0 =C2=A0Next Protocol: indicates the protocol type of the encapsulated= data.
=C2=A0 =C2=A0NSH does not alter the inner payload, and the semantics on the= inner
=C2=A0 =C2=A0protocol remain unchanged due to NSH service function chaining= .
=C2=A0 =C2=A0Please see the IANA Considerations section below, Section 11.2= .5.

=C2=A0 =C2=A0This document defines the following Next Protocol values:

=C2=A0 =C2=A00x1: IPv4
=C2=A0 =C2=A00x2: IPv6
=C2=A0 =C2=A00x3: Ethernet
=C2=A0 =C2=A00x4: NSH
=C2=A0 =C2=A00x5: MPLS
=C2=A0 =C2=A00xFE: Experiment 1
=C2=A0 =C2=A00xFF: Experiment 2

=C2=A0 =C2=A0An implementation not explicitly configured for a specific exp= eriment
=C2=A0 =C2=A0[RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
=C2=A0 =C2=A00xFF.

=C2=A0 =C2=A0An implementation that does not recognize the Next Protocol va= lue
=C2=A0 =C2=A0SHOULD NOT attempt to examine or process the payload of a pack= et.
=C2=A0 =C2=A0The meaning of this will depend on the role of a component wit= hin the
=C2=A0 =C2=A0SFC system.=C2=A0 For example, an SFF may be able to forward a= n NSH packet
=C2=A0 =C2=A0without reference to the payload, but an SF applies a function= to the
=C2=A0 =C2=A0payload and so might be expected to understand the Next Protoc= ol type.
=C2=A0 =C2=A0By default, an implementation that needs to look at the payloa= d of an
=C2=A0 =C2=A0NSH packet MUST drop packets with unknown Next Protocol, but t= his
=C2=A0 =C2=A0behavior SHOULD be configurable.
END

---

11.2.5

OLD
=C2=A0 =C2=A0IANA is requested to set up a registry of "Next Protocol&= quot;.=C2=A0 These are
=C2=A0 =C2=A08-bit values.=C2=A0 Next Protocol values 1, 2, 3, 4, and 5 are= defined
=C2=A0 =C2=A0in this document (see Table 7).=C2=A0 New values are assigned = via "Expert
=C2=A0 =C2=A0Review" as per [RFC8126].

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Next Protocol | Descripti= on=C2=A0 | Reference=C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 0=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| Unassigned=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 1=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| IPv4=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 2=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| IPv6=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 3=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| Ethernet=C2=A0 =C2=A0 =C2=A0| This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 4=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| NSH=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 5=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| MPLS=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 6..253=C2=A0 =C2=A0 =C2= =A0 =C2=A0 | Unassigned=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 254=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0| Experiment 1 | This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 255=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0| Experiment 2 | This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Table 7: NSH Base He= ader Next Protocol Values
NEW
=C2=A0 =C2=A0IANA is requested to set up a registry of "Next Protocol&= quot;.=C2=A0 These are
=C2=A0 =C2=A08-bit values.=C2=A0 Next Protocol values 1, 2, 3, 4, and 5 are= defined
=C2=A0 =C2=A0in this document (see Table 7).=C2=A0 New values are assigned = via "Expert
=C2=A0 =C2=A0Review" as per [RFC8126].

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Next Protocol | Descripti= on=C2=A0 | Reference=C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 0=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| Unassigned=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 1=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| IPv4=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 2=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| IPv6=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 3=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| Ethernet=C2=A0 =C2=A0 =C2=A0| This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 4=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| NSH=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 5=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0| MPLS=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| This docu= ment |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 6..253=C2=A0 =C2=A0 =C2= =A0 =C2=A0 | Unassigned=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 254=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0| Experiment 1 | This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 255=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0| Experiment 2 | This document |
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---------------+----------= ----+---------------+

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Table 7: NSH Base He= ader Next Protocol Values
END

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_______________________________________________
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https://www.ietf.org/mailman/listinfo/sfc

--001a113ce0f8ff2a690554a92c4b-- From nobody Wed Jul 19 07:37:49 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AA29712EAFF for ; Wed, 19 Jul 2017 07:37:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oDncMFneXAiS for ; Wed, 19 Jul 2017 07:37:46 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5687D131C73 for ; Wed, 19 Jul 2017 07:37:45 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id 3C5171C0201; Wed, 19 Jul 2017 07:37:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1500475065; bh=tBPv7yDrgtdhbpz1KdQ99wyvtuxSIVYWB9xa19icEdE=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=giygXtGHS8lj2L1GsPX2Ybir+QQzKSRJsy1lQktDtP4jSroC7dNSjF01M5GuY417b itNLNfmypcEHXFmN6q9ltE98BiVNGQcyz6X1HQe9TgRdqLCCQSe4iNAgGvOPaZgRLF 8gIwHiURaFUV18jt6kEy0sItyrQAK3tJNzOpCL6U= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from dhcp-9365.meeting.ietf.org (dhcp-9365.meeting.ietf.org [31.133.147.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 2DD2C4665A9; Wed, 19 Jul 2017 07:37:42 -0700 (PDT) To: "Kent Leung (kleung)" , Ron Parker , "Joel M. Halpern" , "Reinaldo Penno (repenno)" , Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard Cc: "sfc@ietf.org" References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> From: "Joel M. Halpern" Message-ID: Date: Wed, 19 Jul 2017 10:37:40 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 14:37:49 -0000 Just for clarity, my preference between the algorithmic encoding methods is quite small. Yours, Joel On 7/19/17 4:29 AM, Kent Leung (kleung) wrote: > Hi Ron. The control plane (sect. 5.1) and encoded (sect. 5.3) methods are covered in the draft along with the pros and cons of each of the options. A method to generate asymmetric paths for asymmetric SFC is described in sect. 6. This technique is based on symmetric SI sequence with NOP. Both algorithmic (sects. 5.4.1 & 5.4.2) methods can leverage this SI scheme to support asymmetric SFC. So maybe we need to reword the draft better to explain that mirrored order for both directions is not assumed. > > Just updating the running count: > > Sect 5.4.1 (one service path ID, service index indicates flow direction): > > - (4) Dave, Joel, Ron, Kyle > > Sect 5.4.2 (two service path IDs, each indicate flow direction): > > - (6) Sumandra, Jim, Kent, Renaldo, Roberta, Paul > > Kent > > -----Original Message----- > From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com] > Sent: Tuesday, July 18, 2017 4:12 PM > To: Joel M. Halpern ; Kent Leung (kleung) ; Reinaldo Penno (repenno) ; Dave Dolson ; Roberta Maglione (robmgl) ; James N Guichard > Cc: sfc@ietf.org > Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > Good point on the optionality of this bidirectional concept. > > For the bidirectional case, we would ultimately like to know the correlation of the 2 paths. I'm thinking that this is more, even, than correlating the "forward" SPI and the "reverse" SPI. It also becomes useful to correlate the position of a particular service function. A strict presumption of mirrored order for the 2 directions does not always hold. Lets say in the forward direction we want SF types A, B, C, D but in the reverse direction we want A, D, C, B. It would be useful to know that SF D appears at the 4th position of the forward flow and the 2nd position of the correlated reverse flow. This starts to become too heavy to insert into the encapsulation itself. Instead, this full knowledge can be achieved through control plane distribution and stateful elements (e.g., SFF, SF). > > So, the encapsulation can carry all of the correlation information, none of the correlation information, or some of the correlation information. I'm not so sure "some" is that useful. > > Ron > > > -----Original Message----- > From: Joel M. Halpern [mailto:jmh@joelhalpern.com] > Sent: Tuesday, July 18, 2017 9:58 AM > To: Ron Parker ; Kent Leung (kleung) ; Reinaldo Penno (repenno) ; Dave Dolson ; Roberta Maglione (robmgl) ; James N Guichard > Cc: sfc@ietf.org > Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > Since there are not always two directions, I would prefer not to define that bit as always meaning direction. I do not mind if the bit is used by configuration in a directional fashion. (It is odd, but clearly works.) > > Yours, > Joel > > On 7/18/17 9:12 AM, Ron Parker wrote: >> I support 5.4.1 (single SPI with direction indicated in SI). That >> being said, the approach effectively reduces SI by 1 bit and reallocates >> that bit to direction. Is it feasible to instead be explicit by >> creating an direction bit? Also, how do we refer to directions? >> East/West? North/South? Left/Right? Upstream/Downstream? >> >> Ron >> >> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung >> (kleung) >> *Sent:* Tuesday, July 18, 2017 4:54 AM >> *To:* Reinaldo Penno (repenno) ; Dave Dolson >> ; Roberta Maglione (robmgl) ; >> James N Guichard >> *Cc:* sfc@ietf.org >> *Subject:* Re: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Hi Reinaldo. I agree we need to get agreement in WG and update the >> draft soon as folks are unsure what to implement. >> >> It seems most folks have chimed in. Here’s the latest count. I’m >> putting names down to make sure the count is accurate. >> >> Sect 5.4.1 (one service path ID, service index indicates flow direction): >> >> -(2) Dave, Joel >> >> Sect 5.4.2 (two service path IDs, each indicate flow direction): >> >> -(6) Sumandra, Jim, Kent, Renaldo, Roberta, Paul >> >> Do we have some rough consensus yet? Or wait for more opinions to decide? >> >> Kent >> >> *From:* Reinaldo Penno (repenno) >> *Sent:* Monday, July 17, 2017 3:59 PM >> *To:* Kent Leung (kleung) > >; Dave Dolson > >; Roberta Maglione (robmgl) >> >; James N Guichard >> > >> *Cc:* sfc@ietf.org >> *Subject:* Re: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Hi Kent/others, >> >> this decision is quite important for real deployments, as opposed to >> demos and related. I hope as the first step we all agree that we >> cannot have more than one way of interpreting directionality of paths >> and associated reverse paths. That would be an interoperability >> nightmare and reduce the usefulness of NSH considerably. >> >> So, whatever way it goes the WG needs to embrace it. >> >> Thanks, >> >> *From: *sfc > on >> behalf of "Kent Leung (kleung)" > > >> *Date: *Monday, July 17, 2017 at 10:36 AM >> *To: *Dave Dolson > >, "Roberta Maglione (robmgl)" >> >, James N Guichard >> > >> *Cc: *"sfc@ietf.org " > > >> *Subject: *Re: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Why can’t there be stats for per SPI and more granular stats for per >> SPI/SI? They seem to serve different purposes. The former is providing >> counters for all flows in each service path. The latter is provide >> counters for all flows served at each hop in the service path. >> >> Can you explain the “spiral†scenario and how that pertains to >> usefulness of having per service path stats? Thanks. >> >> Kent >> >> *From:* Dave Dolson [mailto:ddolson@sandvine.com] >> *Sent:* Monday, July 17, 2017 3:01 PM >> *To:* Roberta Maglione (robmgl) > >; James N Guichard >> > >> *Cc:* Kent Leung (kleung) > >; sfc@ietf.org >> *Subject:* RE: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Strictly, stats should be per SPI and SI, in order to support the >> so-called spiral. >> >> But I can see how folks might find the lazy implementation to be useful. >> >> *From:*Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] >> *Sent:* Monday, July 17, 2017 11:00 AM >> *To:* James N Guichard >> *Cc:* Dave Dolson; Kent Leung (kleung); sfc@ietf.org >> >> *Subject:* Re: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> I agree on the operational aspect: having different SPI's for each >> direction simplifies the troubleshooting procedures, as statistics on >> the packets counters for each direction on each SF, can be displayed >> just based on SPI. >> >> Regards, >> >> Roberta >> >> Inviato da iPad >> >> >> Il giorno 15 lug 2017, alle ore 01:09, James N Guichard >> > ha >> scritto: >> >> Yes understood but I was assuming no manipulation of the SI and my >> point was more from an operational perspective; if I use the same >> path ID in both directions then I cannot immediately tell in which >> direction the packets are flowing unless I go one step deeper and >> look at the SI leading to a correlation of SPI + SI to be able to >> figure out my traffic matrix. Not so if the SPI is uni-directional. >> >> Jim >> >> *From:* Dave Dolson [mailto:ddolson@sandvine.com] >> *Sent:* Friday, July 14, 2017 2:51 PM >> *To:* James N Guichard > >; Kent Leung (kleung) >> >; sfc@ietf.org >> >> *Subject:* RE: clarification on Service Path ID for >> draft-penno-sfc-packet >> >> There is not actually forwarding ambiguity, since SFF forwarding >> depends on **both** SPI and SI. >> >> So for example, there is no ambiguity in forwarding to use SI in the >> range [0,127] of up-link and range [128,255] for down-link, on the >> same SPI. >> >> The limitation is ~127 SFs per path instead of ~255. >> >> As I see it, Kent’s question is one of aesthetics. Do folks like the >> same SPI used for two directions? >> >> Personally, I find use of a single SPI to be more elegant, >> consuming only one path ID instead of two. (section 5.4.1). >> >> It may make debugging easier as well. >> >> Also, for what it’s worth, we demonstrated this method of section >> 5.4.1 at a previous IETF hackathon. >> >> -Dave >> >> *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N Guichard >> *Sent:* Friday, July 14, 2017 2:25 PM >> *To:* Kent Leung (kleung); sfc@ietf.org >> *Subject:* Re: [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Hi Kent, >> >> [personal opinion …] I have always assumed that the service path ID >> would be uni-directional given that it would be difficult to avoid >> collision in all forwarding scenarios. If you look at a basic SFC >> a-b-c and the service index is set to 255 at the classifiers a & c >> (which imho will be the normal practice) then at b you would have a >> conflict if the same service path ID is used in both directions. >> >> Jim >> >> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung >> (kleung) >> *Sent:* Friday, July 14, 2017 1:58 PM >> *To:* sfc@ietf.org >> *Subject:* [sfc] clarification on Service Path ID for >> draft-penno-sfc-packet >> >> Hi. We are working on a revision for this draft. There were 4 >> proposed solution options in section 5. During some discussions, >> most folks seem to favor the use of algorithmic method in section >> 5.4. However, there are 2 sub-options. One is based on same Service >> Path ID and using Service Index to determine flow direction (sect. >> 5.4.1). The other is based on setting high order bit on Serve Path >> ID, which determines flow direction (sect. 5.4.2). There are mixed >> opinions. One reason is that there may be the assumption the Service >> Path ID is uni-directional. No explicit wording of that nature has >> been encountered in the RFCs, maybe we missed something? >> >> If Serve Path ID is required to be uni-directional, then the answer >> is easy (=> 5.4.2). We would like to solicit WG comments to get >> rough consensus and revised the next version with that solution. >> This problem is critical to address for Service Function that >> generate packet in reverse direction, especially security service >> functions as mentioned in draft-wang-sfc-ns-use-cases. >> >> Thanks. >> >> Kent >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> >> https://url.serverdata.net/?a_R6iwBQImYWCr69g6-h0raXDRY2EORuQb3vcjuo_j >> Yzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~ >> >> > jYzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~> >> >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://url.serverdata.net/?a_R6iwBQImYWCr69g6-h0raXDRY2EORuQb3vcjuo_j >> Yzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~ >> From nobody Wed Jul 19 08:48:29 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7F5A612F3CB for ; Wed, 19 Jul 2017 08:48:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q3xtGH2zlFV6 for ; Wed, 19 Jul 2017 08:48:24 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C6C52127B60 for ; Wed, 19 Jul 2017 08:48:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=20236; q=dns/txt; s=iport; t=1500479303; x=1501688903; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=8YfKaBdbwrOeKRPkGZbW0qwCWIafquyo+q+xnKyzDhs=; b=TPtcW/seodeCv2i3Rj1KEgE0H7ZFDsLvx0/HgikdMC6lHA58FTmk9D3P 0q/xe2RnWkOvVn1y7syoS8QDTcWSVj/mvWgi3N6y6Ko/YMNlqxeo7ZBFY wwXHu3Gfrxfxyiysin3RfhrASImXcoKpkswP4LXIuX33UejGRNVuZ68M2 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAA+fm9Z/4ENJK1bGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1pkgRQHjgSRYJYEghEshRsCGoNGPxgBAgEBAQEBAQFrKIUYAQE?= =?us-ascii?q?BAQMjEToEBwwEAgEIEQMBAQEBAgIjAwICAjAUAQgIAgQBDQUbihQQtFuCJoQTA?= =?us-ascii?q?YZiAQEBAQEBAQEBAQEBAQEBAQEBAQEBGAWBC4VqggyCeYRxECECglkwgjEFnzk?= =?us-ascii?q?Ch0mDSokEggyJRoZeiUeMFAEfOIEKdRVJEgGFAByBLAE6dgGIEoENAQEB?= X-IronPort-AV: E=Sophos;i="5.40,381,1496102400"; d="scan'208";a="54009695" Received: from alln-core-9.cisco.com ([173.36.13.129]) by rcdn-iport-5.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 19 Jul 2017 15:48:22 +0000 Received: from XCH-ALN-007.cisco.com (xch-aln-007.cisco.com [173.36.7.17]) by alln-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v6JFmKmJ025806 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 19 Jul 2017 15:48:21 GMT Received: from xch-rcd-009.cisco.com (173.37.102.19) by XCH-ALN-007.cisco.com (173.36.7.17) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 19 Jul 2017 10:48:20 -0500 Received: from xch-rcd-009.cisco.com ([173.37.102.19]) by XCH-RCD-009.cisco.com ([173.37.102.19]) with mapi id 15.00.1210.000; Wed, 19 Jul 2017 10:48:20 -0500 From: "Reinaldo Penno (repenno)" To: "Joel M. Halpern" , "Kent Leung (kleung)" , Ron Parker , Dave Dolson , "Roberta Maglione (robmgl)" , "James N Guichard" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACD+PwAAAhrTQAAAUD5AP//0+qAgAFvcoCAAEgOgIAADNAAgAADygCAATLMAIAAZtEA///hcIA= Date: Wed, 19 Jul 2017 15:48:20 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/f.22.0.170515 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.117.6] Content-Type: text/plain; charset="utf-8" Content-ID: <47F32B34E7DCFC4AA4A21642097578D8@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 15:48:26 -0000 TXkgcHJlZmVyZW5jZSAoYXMgSSBleHBsYWluZWQgdG8gRGF2ZSBvZmZsaW5lKSBpcyBiYXNlZCBh IGxvdCBvbiBjdXJyZW50IGltcGxlbWVudGF0aW9ucyBhbmQgdGhlIGRyYWZ0LiANCg0KLSBJIHJl LXJlYWQgTlNIIGJhc2UgYW5kIGFsbCBleGFtcGxlcyBoYXZlLCBhcyBmYXIgYXMgSSBjYW4gdGVs bCwgdW5pZGlyZWN0aW9uYWwgU1BJLiBJdCBtaWdodCBiZSBsZWdhY3ksIGFuIG92ZXJsb29rLCBi dXQgdGhhdCBpdCBpcyBob3cgSSBpbnRlcnByZXQgaXQNCi0gTWFueSB2ZW5kb3JzIG1pZ2h0IGhh dmUgdGFrZW4gdGhhdCB0byBoZWFydC4gWWVzLCBJIGtub3csIHlvdSBzaG91bGQgbm90IGNhc3Qg 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RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7O9M769EhHxZ for ; Wed, 19 Jul 2017 08:50:54 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 102BF131A50 for ; Wed, 19 Jul 2017 08:50:54 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id EBE3EBA02AA; Wed, 19 Jul 2017 08:50:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=1.tigertech; t=1500479453; bh=IT4toBjaSXyIH6Jhu5vTIHv3riTbA61NuDLD85M/Rx0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=f/aNf+fie3ec2Q6PWBjcQW2xXf0gjWWDaViff4tYTVs1Vq/ADRu/QnA+rqRUyUMb4 ORHTEL0AH3uQGB/STrhBaqXYEEQcyUDRMQE8y0zWZLsMsLe6JzlntwbpwM9KdGbf1i VlIwfjpcjFKKtq4jmfRu8/G3BWSLB5IeJDZSGsM8= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from dhcp-84b9.meeting.ietf.org (dhcp-84b9.meeting.ietf.org [31.133.132.185]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 99F78BA02A8; Wed, 19 Jul 2017 08:50:51 -0700 (PDT) To: "Reinaldo Penno (repenno)" , "Kent Leung (kleung)" , Ron Parker , Dave Dolson , "Roberta Maglione (robmgl)" , James N Guichard Cc: "sfc@ietf.org" References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> From: "Joel M. Halpern" Message-ID: <7ed63899-140d-c890-217d-be62136c429f@joelhalpern.com> Date: Wed, 19 Jul 2017 11:50:51 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 15:50:56 -0000 I beg you not to ask for more changes to NSH. The document is in good shape. It will never be perfect. We need to finish it. Having said that, if you really think we need to fix something in the document, you need to say so on the list. I would VERY strongly request that if you do so, please include explicit new text and a clear description of where you think it goes. Yours, Joel On 7/19/17 11:48 AM, Reinaldo Penno (repenno) wrote: > My preference (as I explained to Dave offline) is based a lot on current implementations and the draft. > > - I re-read NSH base and all examples have, as far as I can tell, unidirectional SPI. It might be legacy, an overlook, but that it is how I interpret it > - Many vendors might have taken that to heart. Yes, I know, you should not cast in stone your implementations based on draft…still. > > Irrespective if we change that or not I believe NSH base should clearly state the relationship between forwarding and Path (or Path + ID). Saying nothing is asking for one of those IETF mile-long threads where somebody will argue that saying nothing is the same as ‘allowed’. > > Thanks, > > On 7/19/17, 11:37 AM, "Joel M. Halpern" wrote: > > Just for clarity, my preference between the algorithmic encoding methods > is quite small. > Yours, > Joel > > On 7/19/17 4:29 AM, Kent Leung (kleung) wrote: > > Hi Ron. The control plane (sect. 5.1) and encoded (sect. 5.3) methods are covered in the draft along with the pros and cons of each of the options. A method to generate asymmetric paths for asymmetric SFC is described in sect. 6. This technique is based on symmetric SI sequence with NOP. Both algorithmic (sects. 5.4.1 & 5.4.2) methods can leverage this SI scheme to support asymmetric SFC. So maybe we need to reword the draft better to explain that mirrored order for both directions is not assumed. > > > > Just updating the running count: > > > > Sect 5.4.1 (one service path ID, service index indicates flow direction): > > > > - (4) Dave, Joel, Ron, Kyle > > > > Sect 5.4.2 (two service path IDs, each indicate flow direction): > > > > - (6) Sumandra, Jim, Kent, Renaldo, Roberta, Paul > > > > Kent > > > > -----Original Message----- > > From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com] > > Sent: Tuesday, July 18, 2017 4:12 PM > > To: Joel M. Halpern ; Kent Leung (kleung) ; Reinaldo Penno (repenno) ; Dave Dolson ; Roberta Maglione (robmgl) ; James N Guichard > > Cc: sfc@ietf.org > > Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > > > Good point on the optionality of this bidirectional concept. > > > > For the bidirectional case, we would ultimately like to know the correlation of the 2 paths. I'm thinking that this is more, even, than correlating the "forward" SPI and the "reverse" SPI. It also becomes useful to correlate the position of a particular service function. A strict presumption of mirrored order for the 2 directions does not always hold. Lets say in the forward direction we want SF types A, B, C, D but in the reverse direction we want A, D, C, B. It would be useful to know that SF D appears at the 4th position of the forward flow and the 2nd position of the correlated reverse flow. This starts to become too heavy to insert into the encapsulation itself. Instead, this full knowledge can be achieved through control plane distribution and stateful elements (e.g., SFF, SF). > > > > So, the encapsulation can carry all of the correlation information, none of the correlation information, or some of the correlation information. I'm not so sure "some" is that useful. > > > > Ron > > > > > > -----Original Message----- > > From: Joel M. Halpern [mailto:jmh@joelhalpern.com] > > Sent: Tuesday, July 18, 2017 9:58 AM > > To: Ron Parker ; Kent Leung (kleung) ; Reinaldo Penno (repenno) ; Dave Dolson ; Roberta Maglione (robmgl) ; James N Guichard > > Cc: sfc@ietf.org > > Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet > > > > Since there are not always two directions, I would prefer not to define that bit as always meaning direction. I do not mind if the bit is used by configuration in a directional fashion. (It is odd, but clearly works.) > > > > Yours, > > Joel > > > > On 7/18/17 9:12 AM, Ron Parker wrote: > >> I support 5.4.1 (single SPI with direction indicated in SI). That > >> being said, the approach effectively reduces SI by 1 bit and reallocates > >> that bit to direction. Is it feasible to instead be explicit by > >> creating an direction bit? Also, how do we refer to directions? > >> East/West? North/South? Left/Right? Upstream/Downstream? > >> > >> Ron > >> > >> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung > >> (kleung) > >> *Sent:* Tuesday, July 18, 2017 4:54 AM > >> *To:* Reinaldo Penno (repenno) ; Dave Dolson > >> ; Roberta Maglione (robmgl) ; > >> James N Guichard > >> *Cc:* sfc@ietf.org > >> *Subject:* Re: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Hi Reinaldo. I agree we need to get agreement in WG and update the > >> draft soon as folks are unsure what to implement. > >> > >> It seems most folks have chimed in. Here’s the latest count. I’m > >> putting names down to make sure the count is accurate. > >> > >> Sect 5.4.1 (one service path ID, service index indicates flow direction): > >> > >> -(2) Dave, Joel > >> > >> Sect 5.4.2 (two service path IDs, each indicate flow direction): > >> > >> -(6) Sumandra, Jim, Kent, Renaldo, Roberta, Paul > >> > >> Do we have some rough consensus yet? Or wait for more opinions to decide? > >> > >> Kent > >> > >> *From:* Reinaldo Penno (repenno) > >> *Sent:* Monday, July 17, 2017 3:59 PM > >> *To:* Kent Leung (kleung) >> >; Dave Dolson >> >; Roberta Maglione (robmgl) > >> >; James N Guichard > >> > > >> *Cc:* sfc@ietf.org > >> *Subject:* Re: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Hi Kent/others, > >> > >> this decision is quite important for real deployments, as opposed to > >> demos and related. I hope as the first step we all agree that we > >> cannot have more than one way of interpreting directionality of paths > >> and associated reverse paths. That would be an interoperability > >> nightmare and reduce the usefulness of NSH considerably. > >> > >> So, whatever way it goes the WG needs to embrace it. > >> > >> Thanks, > >> > >> *From: *sfc > on > >> behalf of "Kent Leung (kleung)" >> > > >> *Date: *Monday, July 17, 2017 at 10:36 AM > >> *To: *Dave Dolson >> >, "Roberta Maglione (robmgl)" > >> >, James N Guichard > >> > > >> *Cc: *"sfc@ietf.org " >> > > >> *Subject: *Re: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Why can’t there be stats for per SPI and more granular stats for per > >> SPI/SI? They seem to serve different purposes. The former is providing > >> counters for all flows in each service path. The latter is provide > >> counters for all flows served at each hop in the service path. > >> > >> Can you explain the “spiral†scenario and how that pertains to > >> usefulness of having per service path stats? Thanks. > >> > >> Kent > >> > >> *From:* Dave Dolson [mailto:ddolson@sandvine.com] > >> *Sent:* Monday, July 17, 2017 3:01 PM > >> *To:* Roberta Maglione (robmgl) >> >; James N Guichard > >> > > >> *Cc:* Kent Leung (kleung) >> >; sfc@ietf.org > >> *Subject:* RE: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Strictly, stats should be per SPI and SI, in order to support the > >> so-called spiral. > >> > >> But I can see how folks might find the lazy implementation to be useful. > >> > >> *From:*Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] > >> *Sent:* Monday, July 17, 2017 11:00 AM > >> *To:* James N Guichard > >> *Cc:* Dave Dolson; Kent Leung (kleung); sfc@ietf.org > >> > >> *Subject:* Re: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> I agree on the operational aspect: having different SPI's for each > >> direction simplifies the troubleshooting procedures, as statistics on > >> the packets counters for each direction on each SF, can be displayed > >> just based on SPI. > >> > >> Regards, > >> > >> Roberta > >> > >> Inviato da iPad > >> > >> > >> Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > >> > ha > >> scritto: > >> > >> Yes understood but I was assuming no manipulation of the SI and my > >> point was more from an operational perspective; if I use the same > >> path ID in both directions then I cannot immediately tell in which > >> direction the packets are flowing unless I go one step deeper and > >> look at the SI leading to a correlation of SPI + SI to be able to > >> figure out my traffic matrix. Not so if the SPI is uni-directional. > >> > >> Jim > >> > >> *From:* Dave Dolson [mailto:ddolson@sandvine.com] > >> *Sent:* Friday, July 14, 2017 2:51 PM > >> *To:* James N Guichard >> >; Kent Leung (kleung) > >> >; sfc@ietf.org > >> > >> *Subject:* RE: clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> There is not actually forwarding ambiguity, since SFF forwarding > >> depends on **both** SPI and SI. > >> > >> So for example, there is no ambiguity in forwarding to use SI in the > >> range [0,127] of up-link and range [128,255] for down-link, on the > >> same SPI. > >> > >> The limitation is ~127 SFs per path instead of ~255. > >> > >> As I see it, Kent’s question is one of aesthetics. Do folks like the > >> same SPI used for two directions? > >> > >> Personally, I find use of a single SPI to be more elegant, > >> consuming only one path ID instead of two. (section 5.4.1). > >> > >> It may make debugging easier as well. > >> > >> Also, for what it’s worth, we demonstrated this method of section > >> 5.4.1 at a previous IETF hackathon. > >> > >> -Dave > >> > >> *From:*sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *James N Guichard > >> *Sent:* Friday, July 14, 2017 2:25 PM > >> *To:* Kent Leung (kleung); sfc@ietf.org > >> *Subject:* Re: [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Hi Kent, > >> > >> [personal opinion …] I have always assumed that the service path ID > >> would be uni-directional given that it would be difficult to avoid > >> collision in all forwarding scenarios. If you look at a basic SFC > >> a-b-c and the service index is set to 255 at the classifiers a & c > >> (which imho will be the normal practice) then at b you would have a > >> conflict if the same service path ID is used in both directions. > >> > >> Jim > >> > >> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Kent Leung > >> (kleung) > >> *Sent:* Friday, July 14, 2017 1:58 PM > >> *To:* sfc@ietf.org > >> *Subject:* [sfc] clarification on Service Path ID for > >> draft-penno-sfc-packet > >> > >> Hi. We are working on a revision for this draft. There were 4 > >> proposed solution options in section 5. During some discussions, > >> most folks seem to favor the use of algorithmic method in section > >> 5.4. However, there are 2 sub-options. One is based on same Service > >> Path ID and using Service Index to determine flow direction (sect. > >> 5.4.1). The other is based on setting high order bit on Serve Path > >> ID, which determines flow direction (sect. 5.4.2). There are mixed > >> opinions. One reason is that there may be the assumption the Service > >> Path ID is uni-directional. No explicit wording of that nature has > >> been encountered in the RFCs, maybe we missed something? > >> > >> If Serve Path ID is required to be uni-directional, then the answer > >> is easy (=> 5.4.2). We would like to solicit WG comments to get > >> rough consensus and revised the next version with that solution. > >> This problem is critical to address for Service Function that > >> generate packet in reverse direction, especially security service > >> functions as mentioned in draft-wang-sfc-ns-use-cases. > >> > >> Thanks. > >> > >> Kent > >> > >> _______________________________________________ > >> sfc mailing list > >> sfc@ietf.org > >> > >> https://url.serverdata.net/?a_R6iwBQImYWCr69g6-h0raXDRY2EORuQb3vcjuo_j > >> Yzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~ > >> > >> >> jYzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~> > >> > >> > >> > >> _______________________________________________ > >> sfc mailing list > >> sfc@ietf.org > >> https://url.serverdata.net/?a_R6iwBQImYWCr69g6-h0raXDRY2EORuQb3vcjuo_j > >> Yzi8LHrrWr1VlAzSt23U6FhEXpHwQ1RPMguMZ7RGyHHPw~~ > >> > > From nobody Wed Jul 19 08:55:11 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A023131502 for ; Wed, 19 Jul 2017 08:55:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vapL3-f6p5IX for ; Wed, 19 Jul 2017 08:55:07 -0700 (PDT) Received: from alln-iport-7.cisco.com (alln-iport-7.cisco.com [173.37.142.94]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 27E0E127601 for ; Wed, 19 Jul 2017 08:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=23890; q=dns/txt; s=iport; t=1500479707; x=1501689307; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=1r70ui8dGv9RWcnhEOTVwStvm+B6W4WjbilxHqGRysY=; b=m3A6RO0huqdgN7H8R4Ds8gNtZ4NZ/GZfL0jGSBlOJkvydwJ0T1vdq5RD 4ivLjvZdj2uKNSzL/wcbq9dOtSNqT0tJtnoni7tVr0Cd+7Z+xDKipgfzB SuReLEVCTWRMy5kYKaxW4xFrlF45mRpWiF6XY38v6MfFj7gF8Th1KaQna w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAADtf29Z/5pdJa1bGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1pkgRQHjgSRYJYEghEshRsCGoNGPxgBAgEBAQEBAQFrKIUYAQE?= =?us-ascii?q?BAQMjEToEBwwEAgEIEQMBAQEBAgIjAwICAjAUAQgIAgQBDQUbihQQtGWCJoQTA?= =?us-ascii?q?YZiAQEBAQEBAQEBAQEBAQEBAQEBAQEBGAWBC4VqggyBbYEMhGoHECECglkwgjE?= =?us-ascii?q?FnzkCh0mDSokEggyFT4N3hl6JR4wUAR84gQp1FUkSAYUAHIEsATp2AYgSgQ0BA?= =?us-ascii?q?QE?= X-IronPort-AV: E=Sophos;i="5.40,381,1496102400"; d="scan'208";a="458057462" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by alln-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Jul 2017 15:55:05 +0000 Received: from XCH-RCD-009.cisco.com (xch-rcd-009.cisco.com [173.37.102.19]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id v6JFt5lQ020929 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 19 Jul 2017 15:55:05 GMT Received: from xch-rcd-009.cisco.com (173.37.102.19) by XCH-RCD-009.cisco.com (173.37.102.19) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 19 Jul 2017 10:55:04 -0500 Received: from xch-rcd-009.cisco.com ([173.37.102.19]) by XCH-RCD-009.cisco.com ([173.37.102.19]) with mapi id 15.00.1210.000; Wed, 19 Jul 2017 10:55:04 -0500 From: "Reinaldo Penno (repenno)" To: "Joel M. Halpern" , "Kent Leung (kleung)" , Ron Parker , Dave Dolson , "Roberta Maglione (robmgl)" , "James N Guichard" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACD+PwAAAhrTQAAAUD5AP//0+qAgAFvcoCAAEgOgIAADNAAgAADygCAATLMAIAAZtEA///hcICAADMDgP//zt4A Date: Wed, 19 Jul 2017 15:55:04 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> <7ed63899-140d-c890-217d-be62136c429f@joelhalpern.com> In-Reply-To: <7ed63899-140d-c890-217d-be62136c429f@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/f.22.0.170515 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.117.6] Content-Type: text/plain; charset="utf-8" Content-ID: <629CF4026187F9478B8CCB50D7396079@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 15:55:09 -0000 T2gsIGhvdyBjYW4gSSBub3QgZGVmZXIgdG9hIHJlcXVlc3QgbGlrZSB0aGF0ICg7KQ0KDQpXZSBj YW4gYWx3YXlzIHNheSB0aGF0IHNmYy1wYWNrZXQg4oCYdXBkYXRlcyByZmMgeHh4eOKAmS4NCg0K T24gNy8xOS8xNywgMTI6NTAgUE0sICJKb2VsIE0uIEhhbHBlcm4iIDxqbWhAam9lbGhhbHBlcm4u Y29tPiB3cm90ZToNCg0KICAgIEkgYmVnIHlvdSBub3QgdG8gYXNrIGZvciBtb3JlIGNoYW5nZXMg 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Halpern" Message-ID: <71d77745-e63b-81fd-eb95-f650598f6970@joelhalpern.com> Date: Wed, 19 Jul 2017 13:29:36 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] Administration X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 17:29:43 -0000 We have appointed Tal Mizrahi as working group secretary. In addition to taking minutes, he will be helping the chairs with such tasks as agenda creation. Our thanks to Tal for the work he has already put in with the minutes. 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Malis" , "sfc@ietf.org" Thread-Topic: [sfc] Update to NSH spec - Unknown Next Protocol Thread-Index: AdL/nZQw6cD0GkSfRU67ODDuOkKCsgAKt1SAABV6vl0ABsQbOwAKMoYMAAltWIAAD2K7hA== Date: Wed, 19 Jul 2017 19:30:23 +0000 Message-ID: References: <052f01d2ff9d$a26f30b0$e74d9210$@olddog.co.uk>, , <9CEFFC29-C6CD-4F17-97A6-3FB4CD6A236E@cisco.com>, <20170719024755.5103687.27405.24230@sandvine.com> , <087101d30066$666e5f90$334b1eb0$@olddog.co.uk> In-Reply-To: <087101d30066$666e5f90$334b1eb0$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: multipart/alternative; boundary="_000_FBD729C6A24C488B8DB5B6633503CF36ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 19:30:32 -0000 --_000_FBD729C6A24C488B8DB5B6633503CF36ciscocom_ Content-Type: text/plain; charset="windows-1256" Content-Transfer-Encoding: quoted-printable Adrian, Dave, we can add this. Andrew, thanks much for checking your comments are addressed. Med, thank you for the additional text and editorials. All addressed. All, Based on Med's most recent set of comments in Prague, I also identified a f= ew small fixes in the field definitions and associated IANA parameter assig= nment requests. For example, from RFC 8126, Reserved is very different from= Unassigned. Since version numbers are cheap, new revision being submitted now. FIN Thanks! Sent from my iPad On Jul 19, 2017, at 10:10 AM, Adrian Farrel > wrote: In general, it is worth explaining the converse of the SHOULD (i.e., the MA= Y) even if *we* think it is obvious. This stops the ADs coming back and placing a Discuss because the document "= is not complete" :-) From: Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com] Sent: 19 July 2017 08:40 To: Dave Dolson Cc: Andrew G. Malis; Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol Thanks Dave. I think it is implicit in the SHOULD -- we recommend a behavio= r but there may be valid reasons to do something different, with appropriat= e reflection about potential consequences. Sent from my iPad On Jul 19, 2017, at 4:48 AM, Dave Dolson > wrote: Can 2 be "SHOULD be dropped by default but MAY be configured to =FDforward"= ? Or is that obvious? David Dolson Sandvine From: Carlos Pignataro (cpignata) Sent: Wednesday, July 19, 2017 1:34 AM To: Andrew G. Malis Cc: Adrian Farrel; sfc@ietf.org Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol Thanks Adrian, Andy, and Dave! Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates: 1. Specify protocol 0x0 is unassigned instead of reserved. This is so that = other document can define it. 1.5. Will not merge in Protocol =3D 0. That should be advanced via Adrian's= draft, just as any other protocol support allocation, assignment, and spec= ification. 2. Add that "unknown protocol ids SHOULD be silently dropped", clarifying t= hat behavior. 3. Allow different MD Type in a single SFP, like: "NSH does not disallow it= , but such functionality would need to be explicitly specified." 4. Will update the IANA numbers to hex 5. Will change The should not process to SHOULD be drop for experimental pr= otocols. That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. Sent from my iPad On Jul 18, 2017, at 11:19 AM, Andrew G. Malis > wrote: Adrian, Two comments. 1. It=92s inconsistent to use 0xFE and 0xFF in the main text, but 254 and 2= 55 in the IANA considerations. We should pick one or the other, and have it= the same at both places (I don=92t have a particular preference). 2. Does the text: An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. mean drop or forward? We should be explicit what =93NOT attempt to process= =94 actually means. Thanks, Andy On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel > wrote: Hi, As we have been discussing we need to describe what implementations should = do with unknown "Next Protocol" values. We also need to not block the future u= se of 0x0 (which we might want for "none"). I think we need the following two changes. My words in the last paragraph o= f 2.2 seem excessive and I would be happy to see them reduced. (Note that a couple of typos are also fixed in the changed text.) Adrian --- Section 2.2 OLD Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x0: Reserved 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. NEW Next Protocol: indicates the protocol type of the encapsulated data. NSH does not alter the inner payload, and the semantics on the inner protocol remain unchanged due to NSH service function chaining. Please see the IANA Considerations section below, Section 11.2.5. This document defines the following Next Protocol values: 0x1: IPv4 0x2: IPv6 0x3: Ethernet 0x4: NSH 0x5: MPLS 0xFE: Experiment 1 0xFF: Experiment 2 An implementation not explicitly configured for a specific experiment [RFC3692] SHOULD NOT attempt to process Next Protocol values 0xFE and 0xFF. An implementation that does not recognize the Next Protocol value SHOULD NOT attempt to examine or process the payload of a packet. The meaning of this will depend on the role of a component within the SFC system. For example, an SFF may be able to forward an NSH packet without reference to the payload, but an SF applies a function to the payload and so might be expected to understand the Next Protocol type. By default, an implementation that needs to look at the payload of an NSH packet MUST drop packets with unknown Next Protocol, but this behavior SHOULD be configurable. END --- 11.2.5 OLD IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values NEW IANA is requested to set up a registry of "Next Protocol". These are 8-bit values. Next Protocol values 1, 2, 3, 4, and 5 are defined in this document (see Table 7). New values are assigned via "Expert Review" as per [RFC8126]. +---------------+--------------+---------------+ | Next Protocol | Description | Reference | +---------------+--------------+---------------+ | 0 | Unassigned | | | | | | | 1 | IPv4 | This document | | | | | | 2 | IPv6 | This document | | | | | | 3 | Ethernet | This document | | | | | | 4 | NSH | This document | | | | | | 5 | MPLS | This document | | | | | | 6..253 | Unassigned | | | | | | | 254 | Experiment 1 | This document | | | | | | 255 | Experiment 2 | This document | +---------------+--------------+---------------+ Table 7: NSH Base Header Next Protocol Values END _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_FBD729C6A24C488B8DB5B6633503CF36ciscocom_ Content-Type: text/html; charset="windows-1256" Content-Transfer-Encoding: quoted-printable
Adrian, Dave, we can add this. 
Andrew, thanks much for checking your comments are addressed. 
Med, thank you for the additional text and e= ditorials. All addressed. 

All, 

Based on Med's most recent set of comments i= n Prague, I also identified a few small fixes in the field definitions and = associated IANA parameter assignment requests. For example, from RFC 8126, = Reserved is very different from Unassigned. 

Since version numbers are cheap, new revisio= n being submitted now. 

FIN

Thanks!

Sent from my iPad

On Jul 19, 2017, at 10:10 AM, Adrian Farrel <adrian@olddog.co.uk> wrote:

In general, it is worth explaining the converse of = the SHOULD (i.e., the MAY) even if *we* think it is obvious.

 

This stops the ADs coming back and placing a Discus= s because the document "is not complete"

 

:-)

 

From: Carlos Pignataro (cpignata) [mailto:= cpignata@cisco.com]
Sent: 19 July 2017 08:40
To: Dave Dolson
Cc: Andrew G. Malis; Adrian Farrel; = sfc@ietf.org
Subject: Re: [sfc] Update to NSH spec - Unknown Next Protocol

 

Thanks Dave. I think it is implicit in the SHOULD -- we rec= ommend a behavior but there may be valid reasons to do something different,= with appropriate reflection about potential consequences. <= /o:p>


Sent from my iPad


On Jul 19, 2017, at 4:48 AM, Dave Dolson <ddolson@sandvine.com> wrote:

Can 2 be "SHOULD be dropped by de= fault but MAY be configured to =FDforward"? Or is that obvious?

 

 

David Dolson
Sandvine

From: = Carlos Pignataro (cpignata)

Sent: = Wednesday, July 19, 2017 1:34 AM

To: = Andrew G. Malis

Cc: = Adrian Farrel; sfc@ietf.org

Subject: = Re: [sfc] Update to NSH spec - Unknown Next Protocol

 

Thanks Adrian, Andy, and Dave!

Closing the loop on all these points, as well as next steps for the NSH doc= , planned updates:

 

1. Specify protocol 0x0 is unassigned instead of reserved. = This is so that other document can define it. 

1.5. Will not merge in Protocol =3D 0. That should be advan= ced via Adrian's draft, just as any other protocol support allocation, assi= gnment, and specification. 
2. Add that "unknown protocol ids SHOULD be silently dropped", cl= arifying that behavior. 
3. Allow different MD Type in a single SFP, like: "NSH does not disall= ow it, but such functionality would need to be explicitly specified."<= o:p>

4. Will update the IANA numbers to hex

5. Will change The should no= t process to SHOULD be drop for experimental protocols. 

That's the scope of plan changes. All good useful things, though we have en= tered the diminishing returns territory. 

Sent from my iPad


On Jul 18, 2017, at 11:19 AM, Andrew G. Malis <agmalis@gmail.com> wrote:

Adrian,

 

Two comments.

 

1. It=92s inconsistent to use 0xFE and 0xFF in the main tex= t, but 254 and 255 in the IANA considerations. We should pick one or the ot= her, and have it the same at both places (I don=92t have a particular preference).

 

2. Does the text:

 

   = ;An implementation not explicitly configured for a specific experiment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.

mean drop or forward? We should be explicit what =93NOT att= empt to process=94 actually means.

 

Thanks,

Andy

 

 

On Tue, Jul 18, 2017 at 4:12 AM, Adrian Farrel <adrian@olddog.co.uk&g= t; wrote:

Hi,

As we have been discussing we need to describe what implementations should = do
with unknown "Next Protocol" values. We also need to not block th= e future use of
0x0 (which we might want for "none").

I think we need the following two changes. My words in the last paragraph o= f 2.2
seem excessive and I would be happy to see them reduced.

(Note that a couple of typos are also fixed in the changed text.)

Adrian

---

Section 2.2
OLD
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x0: Reserved
   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.
NEW
   Next Protocol: indicates the protocol type of the encapsulated= data.
   NSH does not alter the inner payload, and the semantics on the= inner
   protocol remain unchanged due to NSH service function chaining= .
   Please see the IANA Considerations section below, Section 11.2= .5.

   This document defines the following Next Protocol values:

   0x1: IPv4
   0x2: IPv6
   0x3: Ethernet
   0x4: NSH
   0x5: MPLS
   0xFE: Experiment 1
   0xFF: Experiment 2

   An implementation not explicitly configured for a specific exp= eriment
   [RFC3692] SHOULD NOT attempt to process Next Protocol values 0= xFE and
   0xFF.

   An implementation that does not recognize the Next Protocol va= lue
   SHOULD NOT attempt to examine or process the payload of a pack= et.
   The meaning of this will depend on the role of a component wit= hin the
   SFC system.  For example, an SFF may be able to forward a= n NSH packet
   without reference to the payload, but an SF applies a function= to the
   payload and so might be expected to understand the Next Protoc= ol type.
   By default, an implementation that needs to look at the payloa= d of an
   NSH packet MUST drop packets with unknown Next Protocol, but t= his
   behavior SHOULD be configurable.
END

---

11.2.5

OLD
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
NEW
   IANA is requested to set up a registry of "Next Protocol&= quot;.  These are
   8-bit values.  Next Protocol values 1, 2, 3, 4, and 5 are= defined
   in this document (see Table 7).  New values are assigned = via "Expert
   Review" as per [RFC8126].

             +---------------+--= ------------+---------------+
             | Next Protocol | Descripti= on  | Reference     |
             +---------------+--= ------------+---------------+
             | 0      &nb= sp;      | Unassigned   |      &nbs= p;        |
             |       = ;        |            &nb= sp; |               |
             | 1      &nb= sp;      | IPv4         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 2      &nb= sp;      | IPv6         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 3      &nb= sp;      | Ethernet     | This document |
             |       = ;        |            &nb= sp; |               |
             | 4      &nb= sp;      | NSH          | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 5      &nb= sp;      | MPLS         | This docu= ment |
             |       = ;        |            &nb= sp; |               |
             | 6..253     = ;   | Unassigned   |           = ;    |
             |       = ;        |            &nb= sp; |               |
             | 254      &= nbsp;    | Experiment 1 | This document |
             |       = ;        |            &nb= sp; |               |
             | 255      &= nbsp;    | Experiment 2 | This document |
             +---------------+--= ------------+---------------+

               Table 7: NSH Base He= ader Next Protocol Values
END

_______________________________________________
sfc mailing list
sfc@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/sfc

 

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/= mailman/listinfo/sfc

--_000_FBD729C6A24C488B8DB5B6633503CF36ciscocom_-- From nobody Wed Jul 19 12:33:13 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 07056131B4E; Wed, 19 Jul 2017 12:33:12 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.57.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150049279195.7362.376727816016869180@ietfa.amsl.com> Date: Wed, 19 Jul 2017 12:33:12 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-16.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jul 2017 19:33:12 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining WG of the IETF. Title : Network Service Header (NSH) Authors : Paul Quinn Uri Elzur Carlos Pignataro Filename : draft-ietf-sfc-nsh-16.txt Pages : 32 Date : 2017-07-19 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-16 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-16 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-16 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Jul 20 05:34:48 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E9D9A131A5F for ; Thu, 20 Jul 2017 05:34:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.749 X-Spam-Level: X-Spam-Status: No, score=-1.749 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ebPOyObD_wX2 for ; Thu, 20 Jul 2017 05:34:45 -0700 (PDT) Received: from mail-wr0-x22b.google.com (mail-wr0-x22b.google.com [IPv6:2a00:1450:400c:c0c::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1FC87129B43 for ; Thu, 20 Jul 2017 05:34:45 -0700 (PDT) Received: by mail-wr0-x22b.google.com with SMTP id k71so16724730wrc.2 for ; Thu, 20 Jul 2017 05:34:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:from:date:message-id:subject:to:cc; bh=XxOg9IfG/LDSxqwTOJx2Bz/t0mEyFeuTPttXHeaTjxo=; b=qC0hihqS1a3OJYR1kQFOepA7MeT4Uke1eU4u3G+HXplEAsXLifK5ex8J+Al5u5tDlP rVak2d3uMZnPTMArx7sCfRKREEcncYApw8MdibOGYcc7xL6nyy0DT2kMG/ctUPyPjrRf X4DaQ5OXKsgCkx22cFDlxMFm5SzYgIpP0NU47CBZ7P1OnW7r2fOBnagDgD5ExVJHYJKY QrVVLHA43uoCdZcu3LRobQlRXBkF/3is4uM8PDa+cU1kJrOvIoCcznX+YlhvkBV2mjEw v3ReEtNVZTxCuELllDD6qfAaF7sYIsQecScTNcvY6BPERcNKd4R3TWNAjaKAeamIl+Ju j/Bw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to:cc; bh=XxOg9IfG/LDSxqwTOJx2Bz/t0mEyFeuTPttXHeaTjxo=; b=CPJ1TOIeBp71hdKgoyCbvAxN1FWRJkE2DylDHH8Ysq+ui7XrWsMFwIwcUNxtiiegCY /GLpt9y86VyCLFLQmDQpQzWSbScQ9+QhQ9VnygZ127jwKaz7pe/ErzHqNkeDnu02bsW5 sWPM5+9njb8PjFeLZnpzPl9Xq//hY1SIxLocD56owpX3SNIiNYbGglMQg0cjxFRLh0zj PmcRP3EPMsFII73mLpaYCBKSnzXvpjtWJ4a32q7GohQ51ShqVDe2/dfo5H+BI4E/2GO+ H6MWCJRBhKoqq0ClVlmnFgUGLHPcHTRijL48JOLFT53xMb9KJJJuFwiwYMCpGEPwfdKV Rdow== X-Gm-Message-State: AIVw111vO5ib3l8sSrRu8SThR2jV6DTUiOmBjEZic0AV1hzZK86yUR/F qVv8OTSFR/W2vKVCjmP6dSL3LgFWPQ== X-Received: by 10.223.173.246 with SMTP id w109mr7059346wrc.113.1500554083578; Thu, 20 Jul 2017 05:34:43 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.138.212 with HTTP; Thu, 20 Jul 2017 05:34:43 -0700 (PDT) Reply-To: sarikaya@ieee.org From: Behcet Sarikaya Date: Thu, 20 Jul 2017 07:34:43 -0500 Message-ID: To: "sfc@ietf.org" Cc: Dirk von Hugo , Mohamed Boucadair Content-Type: multipart/alternative; boundary="f403045cf6481e3b0c0554bef9da" Archived-At: Subject: [sfc] New Version Notification for draft-sarikaya-sfc-hostid-serviceheader-05.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 12:34:47 -0000 --f403045cf6481e3b0c0554bef9da Content-Type: text/plain; charset="UTF-8" Folks, We submitted a keep-alive revision of our hostid service header draft as follows. If you have any comments please post them on the list. Regards, Behcet On Thu, Jul 20, 2017 at 7:30 AM, wrote: > > A new version of I-D, draft-sarikaya-sfc-hostid-serviceheader-05.txt > has been successfully submitted by Behcet Sarikaya and posted to the > IETF repository. > > Name: draft-sarikaya-sfc-hostid-serviceheader > Revision: 05 > Title: Service Function Chaining Service, Subscriber and Host > Identification Use Cases and Metadata > Document date: 2017-07-20 > Group: Individual Submission > Pages: 17 > URL: https://www.ietf.org/internet-drafts/draft-sarikaya-sfc- > hostid-serviceheader-05.txt > Status: https://datatracker.ietf.org/ > doc/draft-sarikaya-sfc-hostid-serviceheader/ > Htmlized: https://tools.ietf.org/html/draft-sarikaya-sfc-hostid- > serviceheader-05 > Htmlized: https://datatracker.ietf.org/doc/html/draft-sarikaya-sfc- > hostid-serviceheader-05 > Diff: https://www.ietf.org/rfcdiff?url2=draft-sarikaya-sfc- > hostid-serviceheader-05 > > Abstract: > This document discusses considerations related to passing service-, > host- and subscriber-related information to upstream Service > Functions for the sake of policy enforcement and appropriate SFC- > inferred forwarding. Once the information is consumed by SFC-aware > elements of an SFC-enabled domain, the information is stripped from > packets so that privacy-sensitive information is not leaked outside > an SFC-enabled domain. > > > > > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > --f403045cf6481e3b0c0554bef9da Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Folks,
We submitted a keep-al= ive revision of our hostid service header draft as follows.
If you= have any comments please post them on the list.

Regards,
<= br>
Behcet

=
On Thu, Jul 20, 2017 at 7:30 AM, <inter= net-drafts@ietf.org> wrote:

A new version of I-D, draft-sarikaya-sfc-hostid-serviceheader-05.txt has been successfully submitted by Behcet Sarikaya and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-sarikaya-sfc-hostid-serviceheader
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A005
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Service Function Chaining Service,= Subscriber and Host Identification Use Cases and Metadata
Document date:=C2=A0 2017-07-20
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 17
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draf= t-sarikaya-sfc-hostid-serviceheader-05.txt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/draft-sarikaya-sfc-host= id-serviceheader/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/draft-sarikaya-sfc-hostid-servi= ceheader-05
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/html/draft-sarikaya-s= fc-hostid-serviceheader-05
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.ietf.org/rfcdiff?url2=3Ddraft-sari= kaya-sfc-hostid-serviceheader-05

Abstract:
=C2=A0 =C2=A0This document discusses considerations related to passing serv= ice-,
=C2=A0 =C2=A0host- and subscriber-related information to upstream Service =C2=A0 =C2=A0Functions for the sake of policy enforcement and appropriate S= FC-
=C2=A0 =C2=A0inferred forwarding.=C2=A0 Once the information is consumed by= SFC-aware
=C2=A0 =C2=A0elements of an SFC-enabled domain, the information is stripped= from
=C2=A0 =C2=A0packets so that privacy-sensitive information is not leaked ou= tside
=C2=A0 =C2=A0an SFC-enabled domain.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


--f403045cf6481e3b0c0554bef9da-- From nobody Thu Jul 20 08:58:31 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 251CA12EC46 for ; Thu, 20 Jul 2017 08:58:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CA-aV1qjQldo for ; Thu, 20 Jul 2017 08:58:27 -0700 (PDT) Received: from asmtp4.iomartmail.com (asmtp4.iomartmail.com [62.128.201.175]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1898D131838 for ; Thu, 20 Jul 2017 08:58:26 -0700 (PDT) Received: from asmtp4.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6KFwPFq032764 for ; Thu, 20 Jul 2017 16:58:25 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6KFwNJN032736 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 20 Jul 2017 16:58:24 +0100 Reply-To: From: "Adrian Farrel" To: Date: Thu, 20 Jul 2017 16:58:22 +0100 Message-ID: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdMBb/Ykf6L/L0d7SJqUUgGBgFsjFg== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23208.000 X-TM-AS-Result: No--15.316-10.0-31-10 X-imss-scan-details: No--15.316-10.0-31-10 X-TMASE-MatchedRID: lXgGh+/cSL1zgDEqoQagemOho7buv7d92sEGsaoEZ+Wor6xvWsFCKAq0 sW66ISNV9NqlIxfveazOZteeqDDMSPPidhFWqRtfKWuiyZLRI4Ae7Kv8iEoZdSFfLRXLwJLUnHP z7V1fJXjKyLrDO3IEJqXZO85sFqlVCCk23kSAVszcWo5Vvs8MQjzcxITw5DtJC/+dM49Ci+wmDO 75eoiNVQU7NGaQE9gJeMh3bNtY/jerSedjouq7Zwbts0Qkqy42oprEeoZHCQIn+p552csI1V5IX 4/V5cctkb5Sck0NPKhNxVvnRV5PpUk8cutMZdwN9Ib/6w+1lWTj5lyuq8IOQf002DXYmoa1upNs DJhuPOtTIKWh1/1CjMk7wt+ebSov2WURF1LpXi5+NQIFduF532KaLwu81+avfS3Xi1H8tPTXrpd vf8fDg5ThJUZF+059KJI8Mmgpl7Rq+Lkur34drQPZZctd3P4BVX7TxgU0dK5MOjKUxCZwr1UVy2 CiCqG03Rukqg57l/Lwu0a+IpWRNaRDh0WoNIr1w69AIwXJn0Z9LQinZ4QefL6qvLNjDYTwfY9hs M0xN70qtq5d3cxkNQP90fJP9eHt Archived-At: Subject: [sfc] Review of draft-ietf-sc-nsh-14 (sic) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 15:58:30 -0000 Hi, Thanks for the recent set of revisions. I started reviewing -14 to look for completion of my comments that I made on -12. I stuck with that when -15 and -16 came out because otherwise I'd have to go back and re-review. You seem to have caught most points I raised, but not acted on a few. I have discarded editorial nits and trivial points that you didn't include - they are not important. But there are a few missed points listed below for attention. Sorry if I missed the discussion on the list about any of these points: I went back to the archive, but didn't find anything. As I went through I also picked up a few new (but small) points I have included at the end of this email. Thanks again for the focus and energy to complete this work. Adrian ======== Why do you point to 7665 for the definition of "Classifier" but then define "Service Classifier" to mean (AFAICS) exactly the same thing? --- Wondering whether "Context Headers" should be "Context Header" throughout. --- OLD 3.2 Version: The version field is used to ensure backward compatibility going forward with future NSH updates. It MUST be set to 0x0 by the sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. YOURS 2.2 Version: The version field is used to ensure backward compatibility going forward with future NSH specification updates. It MUST be set to 0x0 by the sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. I believe this text is presuming the NSH-in-MPLS encapsulation. I don't think it should do that, but if it does we have to look at the first nibble not just the first two bits. Now, as 4385 points out, if the first nibble is 4 or 6, IPv4 or IPv6 will be assumed. So 0b0100 or 0b0110 accounts for you reserving version 1 (just in case the C bit is 0 and for any value of the O bit). So far, so good! But 4385 defines a first nibble of 0000 to mean "here is a control word" and that would mean you needed to reserve version 0 as well :-( So my advice here would be that encapsulation in MPLS is not in scope for this document, and you should not play with reserving version numbers. --- 2.3 In addition to indicating the location within a Service Function Path, SI can be used for service plane loop detection. I think that, although this might still be true, the TTL will be more helpful for loop detection and we should strike this text. --- 3. NSH-aware nodes are the only nodes that may alter the content of the NSH headers. Is there a difference between an "SFC-aware node" and an "NSH-aware node"? If not, you should retain the original terminology. If so, the difference needs to be explained. Isn't this sentence silly? "Only nodes that can understand the content of the NSH can change the content of the NSH" --- 3. Bullet 1 Multiple logical classifiers may exist within a given service path. There are several mentions of a "logical classifier" without discussion or explanation. I looked in 7665 and did not find a description either. I note that the "service classifier" in section 1.2 is described as being "logical" and that is also really unclear not just because of the previous note on "service classifier" and "classifier" but because but because the term "logical" is possibly meant to men something. Why can't you just say "classifier"? --- In Figure 7 - Might an SFC proxy also select service policy for an NSH-unaware SF? --- 4. The presence of NSH is indicated via protocol type or other indicator in the outer encapsulation. You are prejudging the "encapsulation of NSH" work that is to be done. You may be largely correct, but not always. We should omit this text. ============= Additional points on reading now... --- In 2.2 I see 0xF - this value is reserved for experimentation and testing, as per [RFC3692]. Implementations not explicitly configured to be part of an experiment SHOULD silently discard packets with MD Type 0x15. s/x15/xF/ But isn't this controversial? Should an SFF discard a packet with experimental metadata? Why can't an SF pass experimental metadata on to be used by a remote SF? That would allow the experiment to be more flexible and more widely applied. Finally, I wonder whether we shouldn't describe the processing when handling an unknown MD type. (Just like the unknown next protocol.) --- Additionally, I don't see why 11.2.1 is a registry of "reserved bit" with each marked as Reserved (presumably in a 8126 sense). Aren't these actually Unassigned, and shouldn't a registry of bits include the O bit? =========== From nobody Thu Jul 20 17:37:25 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7BA3D131B63 for ; Thu, 20 Jul 2017 17:37:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com 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XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Thu, 20 Jul 2017 20:37:05 -0400 From: "Carlos Pignataro (cpignata)" To: Adrian Farrel CC: Service Function Chaining IETF list Thread-Topic: [sfc] Review of draft-ietf-sc-nsh-14 (sic) Thread-Index: AdMBb/Ykf6L/L0d7SJqUUgGBgFsjFgAawraA Date: Fri, 21 Jul 2017 00:37:05 +0000 Message-ID: References: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> In-Reply-To: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.133] Content-Type: multipart/alternative; boundary="_000_DB13077FA83C4589B45B0C988531CC9Bciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Review of draft-ietf-sc-nsh-14 (sic) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , 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; Thu, 20 Jul 2017 22:23:56 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B92C126C23 for ; Thu, 20 Jul 2017 22:23:55 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6L5No5h020338; Fri, 21 Jul 2017 06:23:50 +0100 Received: from 950129200 ([193.86.203.3]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6L5NmuU020315 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 21 Jul 2017 06:23:49 +0100 Reply-To: From: "Adrian Farrel" To: "'Carlos Pignataro \(cpignata\)'" Cc: "'Service Function Chaining IETF list'" References: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> In-Reply-To: Date: Fri, 21 Jul 2017 06:23:46 +0100 Message-ID: <0d8a01d301e1$874ee3c0$95ecab40$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0D8B_01D301E9.E9182DC0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJGZaO1s3iUCfFM0X7tVq9Zc8e+ZwFtCfH4oWuO91A= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23208.005 X-TM-AS-Result: No--29.421-10.0-31-10 X-imss-scan-details: No--29.421-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO21K8Nm/Cuwye33Pr0vZA7nU0Osg+ixe8Vpifu1ea0XM1rX FZpR0HMKXMEoxMSQEvWC5hlnEK02Zc3KlaPUxdYyeCXTmxf351J0G/OtzV/w6e7FL+ewpDD97sw 7NHM9cHPm4m8Us2HKvPO2uwbtiCY0fdrAxCWNGK7hPOvpPbk2R2Wuy5Lm0L4/ZeL8uQ9GS9cpRF 1+iAK0BWOU+XLfXGbnhSLXXrFP6Cow1qqYDEcGJH6DQ2TEDqZs5PxyeuR3T1JiZCTkFQiKcAO7B C/l/zZY4zQzjRw7GRHYR5hh60asC+FokojhrXL/JrUxoq6hvw8rHkgIan9a0R0bKcI3i70luX/S 7GvvjARFZ4qSfuj8adXri2OrBiAN75On9dsP09xbd1zMnVGjFx9fNWA7SFWq4KKCbqX/Ma8Abcc ZGhEw4LETjv6daYUwLZAvwitH2wKlQz0oy984kVu4M/xm4KZe0Wobj8GkNVoahchoz+8vwmQcKy BERs/hrAO8drUBMBN3Vf2l/e+4VUV9Mrybm4pMbQ9aoPSmWJG0z5JINP7X0tqqof+gfD6RXkhfj 9Xlxy2RvlJyTQ08qE3FW+dFXk+lSTxy60xl3A2JQ9k+Ypk5CZs+tb4NXIJeT7S4ZU4XTxBGnJ7E g+h8pXrl1od4VKFo/W2QRyxiobg0GK4qnKZcDRHRbGr1ECgHCQ3xS+zL6e0Y0A95tjAn+4FFFS/ F46htdJaGtFgL8QIa8S7tBYtNDOkba/0ruqq4Ee5D10MltLY3DZXHZvcdTmxLMp37ya9mHDPvbM PO+Q4iN+DxNma4iAcqDLGJuOS7BQnatCb2G2WeAiCmPx4NwGmRqNBHmBve1kTfEkyaZdxFGCd0S 0NCsvzJHNW3JL+cwa6ZeJCkqU0VSsA76AAB9erwVNGsW65EPpCuffGH9zI= Archived-At: Subject: Re: [sfc] Review of draft-ietf-sc-nsh-14 (sic) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 05:23:59 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0D8B_01D301E9.E9182DC0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I see no reasons for the April 1st RFC you mention: we already have RFC = 7282. =20 =20 =20 From: Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com]=20 Sent: 21 July 2017 01:37 To: Adrian Farrel Cc: Service Function Chaining IETF list Subject: Re: [sfc] Review of draft-ietf-sc-nsh-14 (sic) =20 Hi, Adrian,=20 =20 An interesting idea just occurred to me! We could start working on a set = of Performance Metrics for Internet-Draft Reviews =E2=80=94 we could = define metrics (e.g., time to initial review, mean time between = re-reviews), units (e.g., hours, days, months, IETF meetings), and = specify mechanics for measurement (distribution of reviews after = deadline) :-) =20 I=E2=80=99ll be happy to contribute (or better to review! :-), we could = shoot for publishing on April 1st, not specifying the year of course :-) =20 Slightly more seriously, a few of these are already fixed in the = currently posted revision. =20 Fully seriously now: =20 Thank you very much again Adrian for the newly discovered nits, = editorials, and questions, and apologies on my behalf, editors, and WG = for having missed some of the earlier comments. For real, thanks for the = time and insight. =20 I appreciate these and we should (and will) address them. =20 *** However=E2=80=A6 *** =20 Hi, Chairs, =20 I very strongly recommend you ship the current revision to the AD. = Nothing below is a show-stopper. We can continue integrating these in = successive approximations towards perfection in /main, while publication = is requested and the AD takes her/his time. =20 We have to draw the line somewhere, so, here it goes, the line before = the comments below: =20 ______________________________________ =20 Thanks! =20 =E2=80=94 Carlos. =20 On Jul 20, 2017, at 11:58 AM, Adrian Farrel wrote: =20 Hi, Thanks for the recent set of revisions. I started reviewing -14 to look for completion of my comments that I made on -12. I stuck with that when -15 and -16 came out because otherwise I'd have to go back and re-review. You seem to have caught most points I raised, but not acted on a few. I have discarded editorial nits and trivial points that you=20 didn't include - they are not important. But there are a few missed points listed below for attention. Sorry if I missed the discussion on the list about any of these points: I went back to the archive,=20 but didn't find anything. As I went through I also picked up a few new (but small) points I have included at the end of this email. Thanks again for the focus and energy to complete this work. Adrian =3D=3D=3D=3D=3D=3D=3D=3D Why do you point to 7665 for the definition of "Classifier" but then define "Service Classifier" to mean (AFAICS) exactly the same thing? --- Wondering whether "Context Headers" should be "Context Header" throughout. --- OLD 3.2 Version: The version field is used to ensure backward compatibility going forward with future NSH updates. It MUST be set to 0x0 by the sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. YOURS 2.2 Version: The version field is used to ensure backward compatibility going forward with future NSH specification updates. It MUST be set to 0x0 by the sender, in this first revision of NSH. Given the widespread implementation of existing hardware that uses the first nibble after an MPLS label stack for ECMP decision processing, this document reserves version 01 and this value MUST NOT be used in future versions of the protocol. Please see [RFC7325] for further discussion of MPLS-related forwarding requirements. I believe this text is presuming the NSH-in-MPLS encapsulation. I don't think it should do that, but if it does we have to look at the first nibble not just the first two bits. Now, as 4385 points out, if the first nibble is 4 or 6, IPv4 or IPv6 will be assumed. So 0b0100 or 0b0110 accounts for you reserving version 1 (just in case the C bit is 0 and for any value of the O bit). So far, so good! But 4385 defines a first nibble of 0000 to mean "here is a control word" and that would mean you needed to reserve version 0 as well :-( So my advice here would be that encapsulation in MPLS is not in scope for this document, and you should not play with reserving version numbers. --- 2.3 In addition to indicating the location within a Service Function Path, SI can be used for service plane loop detection. I think that, although this might still be true, the TTL will be more helpful for loop detection and we should strike this text. --- 3. NSH-aware nodes are the only nodes that may alter the content of the NSH headers. Is there a difference between an "SFC-aware node" and an "NSH-aware node"? If not, you should retain the original terminology. If so, the difference needs to be explained. Isn't this sentence silly? "Only nodes that can understand the content of the NSH can change the content of the NSH" --- 3. Bullet 1 Multiple logical classifiers may exist within a given service path. There are several mentions of a "logical classifier" without discussion or explanation. I looked in 7665 and did not find a description either. I note that the "service classifier" in section 1.2 is described as=20 being "logical" and that is also really unclear not just because of the previous note on "service classifier" and "classifier" but because=20 but because the term "logical" is possibly meant to men something. Why can't you just say "classifier"? --- In Figure 7 - Might an SFC proxy also select service policy for an NSH-unaware SF? --- 4. The presence of NSH is indicated via protocol type or other indicator in the outer encapsulation. You are prejudging the "encapsulation of NSH" work that is to be done. You may be largely correct, but not always. We should omit this text. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Additional points on reading now... --- In 2.2 I see 0xF - this value is reserved for experimentation and testing, as per [RFC3692]. Implementations not explicitly configured to be part of an experiment SHOULD silently discard packets with MD Type 0x15. s/x15/xF/ But isn't this controversial? Should an SFF discard a packet with=20 experimental metadata?=20 Why can't an SF pass experimental metadata on to be used by a remote SF? That would allow the experiment to be more flexible and more widely=20 applied. Finally, I wonder whether we shouldn't describe the processing when=20 handling an unknown MD type. (Just like the unknown next protocol.) --- Additionally, I don't see why 11.2.1 is a registry of "reserved bit"=20 with each marked as Reserved (presumably in a 8126 sense). Aren't these actually Unassigned, and shouldn't a registry of bits include the O bit? =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc =20 =E2=80=94 Carlos Pignataro, carlos@cisco.com =E2=80=9CSometimes I use big words that I do not fully understand, to = make myself sound more photosynthesis." =20 ------=_NextPart_000_0D8B_01D301E9.E9182DC0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I see no reasons for the April = 1st RFC you mention: we already have RFC 7282.

 

 

 

From: Carlos Pignataro = (cpignata) [mailto:cpignata@cisco.com]
Sent: 21 July 2017 = 01:37
To: Adrian Farrel
Cc: Service Function = Chaining IETF list
Subject: Re: [sfc] Review of = draft-ietf-sc-nsh-14 (sic)

 

Hi, Adrian, =

 

An interesting idea just occurred to me! We could start working = on a set of Performance Metrics for Internet-Draft Reviews =E2=80=94 we = could define metrics (e.g., time to initial review, mean time between = re-reviews), units (e.g., hours, days, months, IETF meetings), and = specify mechanics for measurement (distribution of reviews after = deadline) :-)

 

I=E2=80=99ll be happy to contribute (or better to review! :-), = we could shoot for publishing on April 1st, not specifying the year of = course :-)

 

Slightly more seriously, a few of these are already fixed in the = currently posted revision.

 

Fully seriously now:

 

Thank you very much again Adrian for the newly discovered nits, = editorials, and questions, and apologies on my behalf, editors, and WG = for having missed some of the earlier comments. For real, thanks for the = time and insight.

 

I appreciate these and we should (and will) address = them.

 

*** However=E2=80=A6 ***

 

Hi, Chairs,

 

I very strongly recommend you ship the current revision to the = AD. Nothing below is a show-stopper. We can continue integrating these = in successive approximations towards perfection in /main, while = publication is requested and the AD takes her/his = time.

 

We have to draw the line somewhere, so, here it goes, the line = before the comments below:

 

______________________________________

 

Thanks!

 

=E2=80=94 Carlos.

 

On Jul 20, 2017, at 11:58 AM, Adrian Farrel <adrian@olddog.co.uk> = wrote:

 

Hi,

Thanks = for the recent set of revisions. I started reviewing -14 to
look for = completion of my comments that I made on -12. I stuck with
that when = -15 and -16 came out because otherwise I'd have to go
back and = re-review.

You seem to have caught most points I raised, but not = acted on a
few. I have discarded editorial nits and trivial points = that you
didn't include - they are not important. But there are a = few missed
points listed below for attention. Sorry if I missed the = discussion
on the list about any of these points: I went back to the = archive,
but didn't find anything.

As I went through I also = picked up a few new (but small) points I have
included at the end of = this email.

Thanks again for the focus and energy to complete = this work.

Adrian

=3D=3D=3D=3D=3D=3D=3D=3D

Why do = you point to 7665 for the definition of "Classifier" but = then
define "Service Classifier" to mean (AFAICS) exactly = the same thing?

---

Wondering whether "Context = Headers" should be "Context = Header"
throughout.

---

OLD
3.2

 &nb= sp;Version: The version field is used to ensure backward = compatibility
  going forward with future NSH updates. =  It MUST be set to 0x0 by the
  sender, in this first = revision of NSH.  Given the = widespread
  implementation of existing hardware that uses = the first nibble after
  an MPLS label stack for ECMP = decision processing, this document
  reserves version 01 = and this value MUST NOT be used in future
  versions of the = protocol.  Please see [RFC7325] for = further
  discussion of MPLS-related forwarding = requirements.
YOURS
2.2
  Version: The version field = is used to ensure backward compatibility
  going forward = with future NSH specification updates.  It MUST be = set
  to 0x0 by the sender, in this first revision of NSH. =  Given the
  widespread implementation of existing = hardware that uses the first
  nibble after an MPLS label = stack for ECMP decision processing, this
  document = reserves version 01 and this value MUST NOT be used = in
  future versions of the protocol.  Please see = [RFC7325] for further
  discussion of MPLS-related = forwarding requirements.

I believe this text is presuming the = NSH-in-MPLS encapsulation. I don't
think it should do that, but if it = does we have to look at the first
nibble not just the first two = bits.

Now, as 4385 points out, if the first nibble is 4 or 6, = IPv4 or IPv6
will be assumed. So 0b0100 or 0b0110 accounts for you = reserving version
1 (just in case the C bit is 0 and for any value of = the O bit). So far,
so good!

But 4385 defines a first nibble = of 0000 to mean "here is a control word"
and that would = mean you needed to reserve version 0 as well :-(

So my advice = here would be that encapsulation in MPLS is not in scope
for this = document, and you should not play with reserving = version
numbers.

---

2.3

  In addition = to indicating
  the location within a Service Function = Path, SI can be used for
  service plane loop = detection.

I think that, although this might still be true, the = TTL will be more
helpful for loop detection and we should strike this = text.

---

3.

  NSH-aware nodes are the = only nodes that may alter the content of the
  NSH = headers.

Is there a difference between an "SFC-aware = node" and an "NSH-aware
node"? If not, you should = retain the original terminology. If so, the
difference needs to be = explained.

Isn't this sentence silly? "Only nodes that can = understand the content
of the NSH can change the content of the = NSH"

---

3.
Bullet = 1

      Multiple logical = classifiers may exist within a given = service
      path.

There are = several mentions of a "logical classifier" without = discussion
or explanation. I looked in 7665 and did not find a = description either.
I note that the "service classifier" in = section 1.2 is described as
being "logical" and that is = also really unclear not just because of
the previous note on = "service classifier" and "classifier" but because =
but because the term "logical" is possibly meant to men = something.

Why can't you just say = "classifier"?

---

In Figure 7

- Might an = SFC proxy also select service policy for an NSH-unaware = SF?

---

4.

  The presence of NSH = is
  indicated via protocol type or other indicator in the = outer
  encapsulation.

You are prejudging the = "encapsulation of NSH" work that is to be done.
You may be = largely correct, but not always. We should omit this = text.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Additional = points on reading now...

---

In 2.2 I = see

  0xF - this value is reserved for experimentation = and testing, as per
  [RFC3692].  Implementations not = explicitly configured to be part of
  an experiment SHOULD = silently discard packets with MD Type = 0x15.

<smile>

s/x15/xF/

But isn't this = controversial? Should an SFF discard a packet with
experimental = metadata?

Why can't an SF pass experimental metadata on to be = used by a remote SF?
That would allow the experiment to be more = flexible and more widely
applied.

Finally, I wonder whether = we shouldn't describe the processing when
handling an unknown MD = type. (Just like the unknown next = protocol.)

---

Additionally, I don't see why 11.2.1 is a = registry of "reserved bit"
with each marked as Reserved = (presumably in a 8126 sense).  Aren't these
actually Unassigned, = and shouldn't a registry of bits include the O = bit?


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

________________= _______________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/m= ailman/listinfo/sfc

 

=E2=80=94

Carlos Pignataro, carlos@cisco.com

=E2=80=9C= Sometimes I use big words that I do not fully understand, to make myself = sound = more photosynthesis."

 

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Halpern" , Ron Parker , "Dave Dolson" , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgA== Date: Tue, 25 Jul 2017 22:32:03 +0000 Message-ID: <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.100.101] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 22:32:07 -0000 SXQgc2VlbXMgZW5vdWdoIHRpbWUgaGFzIGVsYXBzZWQgZm9yIGZvbGtzIHRvIGNoaW1lIGluIHRo ZWlyIHByZWZlcmVuY2VzIG9uIHRoZSBzb2x1dGlvbiBvcHRpb24uIA0KDQpJIGJlbGlldmUgdGhh dCBjb21tdW5pY2F0aW9uIGJldHdlZW4gdHdvIGVuZHBvaW50cyBpcyBiYXNlZCBvbiBmbG93IHRy YWZmaWMgZnJvbSBzb3VyY2UgdG8gZGVzdGluYXRpb24uIEEgc2VydmljZSBwYXRoIGRpY3RhdGVz IHdoaWNoIHNlcnZpY2UgZnVuY3Rpb25zIGFyZSBhcHBsaWVkIGZvciB0aGUgdHJhZmZpYy4gVGVj aG5pY2FsbHksIGEgZmxvdyBpcyB0ZXJtaW5hdGVkIGF0IHRoZSByZWNlaXZpbmcgZW5kcG9pbnQu IFNvLCB0aGUgc2VydmljZSBwYXRoIGVuZGVkIGF0IHRoZSBsYXN0IGhvcC4gQ29tbXVuaWNhdGlv biBtYXkgYmUgdW5pLWRpcmVjdGlvbmFsIChvbmUgZmxvdykgb3IgYmktZGlyZWN0aW9uYWwgKHR3 byBmbG93cykuIFJGQyA3NjY1IGRlc2NyaWJlcyBTRkMgYXMgc3RlZXJpbmcgb2YgdHJhZmZpYyBm bG93cyB0aHJvdWdoIHNlcnZpY2UgZnVuY3Rpb25zLiBNeSBpbnRlcnByZXRhdGlvbiBpcyB0aGF0 IHRoZSBzZXJ2aWNlIHBhdGggaXMgYXNzb2NpYXRlZCB3aXRoIHRoZSBmbG93LiBBIG5ldyBmbG93 IGdvaW5nIGluIHRoZSByZXZlcnNlIGRpcmVjdGlvbiBzaG91bGQgYmUgdHJlYXRlZCB3aXRoIGEg bmV3IHNlcnZpY2UgcGF0aCAoc2V0IHVwIHRvIGhhbmRsZSB0aGF0IGZsb3cpIGFuZCBub3QgY29u dGludWF0aW9uIG9mIHRoZSBzYW1lIHNlcnZpY2UgcGF0aCAoc2V0IHVwIHRvIGhhbmRsZSBvcmln aW5hbCBmbG93KSBpbiB0aGUgZm9yd2FyZCBkaXJlY3Rpb24uIFNlZW1zIGxvZ2ljYWwgdG8gbWUg ZnJvbSB0aGF0IHBlcnNwZWN0aXZlLg0KDQpUaGUgc2VydmljZSBwYXRoIElEIGlzIHVzZWQgdG8g aWRlbnRpZnkgdGhlIHNlcnZpY2UgcGF0aCBhbmQgdGhlIHNlcnZpY2UgaW5kZXggaXMgdXNlZCB0 byBpZGVudGlmeSB0aGUgbG9jYXRpb24gd2l0aGluIHRoZSBzZXJ2aWNlIHBhdGggYXMgc3RhdGVk IGluIGN1cnJlbnQgTlNIIGRyYWZ0Og0KDQoiIE5TSCBjb250YWlucyBhIFNlcnZpY2UgUGF0aCBJ ZGVudGlmaWVyIChTUEkpIGFuZCBhIFNlcnZpY2UgSW5kZXggKFNJKS4gIFRoZSBTUEkgaXMsIGFz IHBlciBpdHMgbmFtZSwgYW4gaWRlbnRpZmllciIgb2YgdGhlIHNlcnZpY2UgcGF0aC4gDQoNCiJU aGUgU2VydmljZSBJbmRleCBwcm92aWRlcyBhbiBpbmRpY2F0aW9uIG9mIGxvY2F0aW9uIHdpdGhp biBhIHNlcnZpY2UgcGF0aC4iDQoNCkdpdmVuIHRoYXQgYm90aCBvcHRpb25zIHN1cHBvcnQgYXN5 bW1ldHJpYyBhbmQgc3ltbWV0cmljIFNGQ3MsIGhhcyBhbnlvbmUgY2hhbmdlIHRoZWlyIG1pbmQg b24gc2VsZWN0aW5nIGFuIG9wdGlvbiB0byBnbyBmb3J0aD8gQmFzZWQgb24gdGhlIGZlZWRiYWNr LCBpdCBzZWVtcyB0aGF0IHdlIGFsbCBhZ3JlZSB0byBjaG9vc2Ugb25lIHNvbHV0aW9uIGluc3Rl YWQgb2YgYWxsb3dpbmcgbXVsdGlwbGUgb3B0aW9ucyBmb3IgYWRkcmVzc2luZyByZXZlcnNlIHBh Y2tldCBnZW5lcmF0aW9uIHNjZW5hcmlvLiBOb3csIHdoYXQgc2hvdWxkIHdlIG5lZWQgdG8gZG8g dG8gYWNoaWV2ZSB0aGF0PyBSb2NrLXBhcGVyLXNjaXNzb3I/IDopDQoNCkN1cnJlbnQgY291bnQg YXMgSm9lbCBpcyBPSyB3aXRoIGVpdGhlciBvcHRpb24uDQoNClNlY3QgNS40LjEgKG9uZSBzZXJ2 aWNlIHBhdGggSUQsIHNlcnZpY2UgaW5kZXggaW5kaWNhdGVzIGZsb3cgZGlyZWN0aW9uKToNCg0K LQkoNCkgRGF2ZSwgSm9lbCwgUm9uLCBLeWxlDQoNClNlY3QgNS40LjIgKHR3byBzZXJ2aWNlIHBh dGggSURzLCBlYWNoIGluZGljYXRlIGZsb3cgZGlyZWN0aW9uKToNCg0KLQkoNykgU3VtYW5kcmEs IEppbSwgS2VudCwgUmVuYWxkbywgUm9iZXJ0YSwgUGF1bCwgSm9lbA0KwqANCktlbnQNCg0KPHNu aXA+DQoNCg== From nobody Tue Jul 25 18:55:11 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD3E41321AA for ; Tue, 25 Jul 2017 18:55:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5XDOtv_mKscC for ; Tue, 25 Jul 2017 18:55:07 -0700 (PDT) Received: from mail1.sandvine.com (mail1.sandvine.com [64.7.137.165]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2E11E1321A8 for ; Tue, 25 Jul 2017 18:55:07 -0700 (PDT) Received: from WTL-EXCHP-2.sandvine.com ([fe80::68ac:f071:19ff:3455]) by WTL-EXCHP-3.sandvine.com ([fe80::3c39:d305:d721:f00a%15]) with mapi id 14.03.0319.002; Tue, 25 Jul 2017 21:55:04 -0400 From: Dave Dolson To: "Kent Leung (kleung)" , "Reinaldo Penno (repenno)" , "Joel M. Halpern" , Ron Parker , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgAEyaeV6 Date: Wed, 26 Jul 2017 01:55:04 +0000 Message-ID: <20170726015503.5103687.96388.25593@sandvine.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> , <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> In-Reply-To: <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-c2processedorg: b2f06e69-072f-40ee-90c5-80a34e700794 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 01:55:09 -0000 Are the 5.4.2 folks willing to consider using the lower bit for odd/even pa= irs instead of the upper bit? David Dolson Sandvine Original Message From: Kent Leung (kleung) Sent: Tuesday, July 25, 2017 6:32 PM To: Reinaldo Penno (repenno); Joel M. Halpern; Ron Parker; Dave Dolson; Rob= erta Maglione (robmgl); James N Guichard Cc: sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket It seems enough time has elapsed for folks to chime in their preferences on= the solution option. I believe that communication between two endpoints is based on flow traffic= from source to destination. A service path dictates which service function= s are applied for the traffic. Technically, a flow is terminated at the rec= eiving endpoint. So, the service path ended at the last hop. Communication = may be uni-directional (one flow) or bi-directional (two flows). RFC 7665 d= escribes SFC as steering of traffic flows through service functions. My int= erpretation is that the service path is associated with the flow. A new flo= w going in the reverse direction should be treated with a new service path = (set up to handle that flow) and not continuation of the same service path = (set up to handle original flow) in the forward direction. Seems logical to= me from that perspective. The service path ID is used to identify the service path and the service in= dex is used to identify the location within the service path as stated in c= urrent NSH draft: " NSH contains a Service Path Identifier (SPI) and a Service Index (SI). T= he SPI is, as per its name, an identifier" of the service path. "The Service Index provides an indication of location within a service path= ." Given that both options support asymmetric and symmetric SFCs, has anyone c= hange their mind on selecting an option to go forth? Based on the feedback,= it seems that we all agree to choose one solution instead of allowing mult= iple options for addressing reverse packet generation scenario. Now, what s= hould we need to do to achieve that? Rock-paper-scissor? :) Current count as Joel is OK with either option. Sect 5.4.1 (one service path ID, service index indicates flow direction): - (4) Dave, Joel, Ron, Kyle Sect 5.4.2 (two service path IDs, each indicate flow direction): - (7) Sumandra, Jim, Kent, Renaldo, Roberta, Paul, Joel Kent From nobody Tue Jul 25 23:27:01 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 724B71293E1 for ; Tue, 25 Jul 2017 23:26:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) 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(TLS) id 15.0.1210.3; Wed, 26 Jul 2017 02:26:54 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Wed, 26 Jul 2017 02:26:54 -0400 From: "Carlos Pignataro (cpignata)" To: Adrian Farrel CC: "sfc@ietf.org" Thread-Topic: [sfc] Review of draft-ietf-sc-nsh-14 (sic) Thread-Index: AdMBb/Ykf6L/L0d7SJqUUgGBgFsjFgEib8eA Date: Wed, 26 Jul 2017 06:26:54 +0000 Message-ID: References: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> In-Reply-To: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.7.20] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Review of draft-ietf-sc-nsh-14 (sic) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 06:26:59 -0000 SGkgQWRyaWFuLA0KDQpUaGFuayB5b3UgZm9yIGNoZWNraW5nIGluIGFuZCByZXZpZXdpbmcgdGhh dCB0aGVzZSBlYXJsaWVyIGNvbW1lbnRzIHdlcmUgYWRkcmVzc2VkLg0KDQpMb29raW5nIGF0IHRo ZSBsaXN0IGFyY2hpdmVzLCB5b3VyIGluaXRpYWwgZW1haWwgd2FzIHJlc3BvbmRlZCB0bywgd2l0 aCBubyBhZGRpdGlvbmFsIGZvbGxvdy11cC4gU2VlOg0KaHR0cHM6Ly9tYWlsYXJjaGl2ZS5pZXRm Lm9yZy9hcmNoL21zZy9zZmMvQnlGUTJJQ3RBUHRWcl9IWURRODM3eEFEMXdvLz9xaWQ9ODc2MjJm NmYyY2IwM2Q4OTQ2ZGNlOGM4MGY0M2VlNmUNCg0KUGxlYXNlIHNlZSBpbmxpbmUgZm9yIGFkZGl0 aW9uYWwgcmVzcG9uc2VzLg0KDQo+IE9uIEp1bCAyMCwgMjAxNywgYXQgODo1OCBBTSwgQWRyaWFu IEZhcnJlbCA8YWRyaWFuQG9sZGRvZy5jby51az4gd3JvdGU6DQo+IA0KPiBIaSwNCj4gDQo+IFRo YW5rcyBmb3IgdGhlIHJlY2VudCBzZXQgb2YgcmV2aXNpb25zLiBJIHN0YXJ0ZWQgcmV2aWV3aW5n IC0xNCB0bw0KPiBsb29rIGZvciBjb21wbGV0aW9uIG9mIG15IGNvbW1lbnRzIHRoYXQgSSBtYWRl 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B678A129B15; Tue, 25 Jul 2017 23:28:26 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.57.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150105050668.26273.9729438953547730247@ietfa.amsl.com> Date: Tue, 25 Jul 2017 23:28:26 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-17.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 06:28:27 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining WG of the IETF. Title : Network Service Header (NSH) Authors : Paul Quinn Uri Elzur Carlos Pignataro Filename : draft-ietf-sfc-nsh-17.txt Pages : 32 Date : 2017-07-25 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-17 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-17 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-17 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Jul 25 23:41:51 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65586129AF9 for ; Tue, 25 Jul 2017 23:41:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, 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with mapi id 15.00.1210.000; Wed, 26 Jul 2017 02:41:45 -0400 From: "Carlos Pignataro (cpignata)" To: Adrian Farrel CC: Service Function Chaining IETF list Thread-Topic: [sfc] Review of draft-ietf-sc-nsh-14 (sic) Thread-Index: AdMBb/Ykf6L/L0d7SJqUUgGBgFsjFgAawraAAAoDJgAA/ixOAA== Date: Wed, 26 Jul 2017 06:41:45 +0000 Message-ID: <562F7234-08A4-47E9-8878-AD38E3BD6A03@cisco.com> References: <0cbc01d30171$0416c650$0c4452f0$@olddog.co.uk> <0d8a01d301e1$874ee3c0$95ecab40$@olddog.co.uk> In-Reply-To: <0d8a01d301e1$874ee3c0$95ecab40$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.7.20] Content-Type: multipart/alternative; boundary="_000_562F723408A447E98878AD38E3BD6A03ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] Review of draft-ietf-sc-nsh-14 (sic) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 06:41:50 -0000 --_000_562F723408A447E98878AD38E3BD6A03ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksIEFkcmlhbiwNCg0KSW4gcmVnYXJkcyB0byB5b3VyIHJldmlldyBjb21tZW50cyBiYXNlZCBv biAtMTIsIHRoZXkgd2VyZSBhZGRyZXNzZWQgaXRlbS1ieS1pdGVtIG9uIGEgcmVzcG9uc2UgcG9z dGVkIG9uIDIwIE1hcmNoIDIwMTcsIGF0Og0KaHR0cHM6Ly9tYWlsYXJjaGl2ZS5pZXRmLm9yZy9h cmNoL21zZy9zZmMvQnlGUTJJQ3RBUHRWcl9IWURRODM3eEFEMXdvLz9xaWQ9ODc2MjJmNmYyY2Iw M2Q4OTQ2ZGNlOGM4MGY0M2VlNmUNClRoZSBsaXN0IGRvZXMgbm90IHNob3cgZm9sbG93LXVwIGZy b20geW91LiBUaGUgb25seSBwZW5kaW5nIGl0ZW0gdGhhdCBJIGNvdWxkIGlkZW50aWZ5IHdhcyB5 b3VyIGNvbW1lbnQgcmVnYXJkaW5nIFRUTCwgd2hpY2ggd2FzIGRlZmVycmVkICjigJxQUT4gIE9u Y2Ugd2UgZmluYWxpemUgdGhlIFRUTCBkZXRhaWxzLCBJIGFncmVlIHRoaXMnbGwgYmUgY2xlYW5l ZCB1cC7igJ0pDQpSZXZpc2lvbiAtMTcsIHdoaWNoIHBvc3RlZCBtb21lbnRzIGFnbywgYWRkcmVz 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X-Test-IDTracker: no X-IETF-IDTracker: 6.57.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150105166374.26505.1492474336844233971@ietfa.amsl.com> Date: Tue, 25 Jul 2017 23:47:43 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-18.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 06:47:44 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining WG of the IETF. Title : Network Service Header (NSH) Authors : Paul Quinn Uri Elzur Carlos Pignataro Filename : draft-ietf-sfc-nsh-18.txt Pages : 32 Date : 2017-07-25 Abstract: This document describes a Network Service Header (NSH) inserted onto packets or frames to realize service function paths. NSH also provides a mechanism for metadata exchange along the instantiated service paths. NSH is the SFC encapsulation required to support the Service Function Chaining (SFC) architecture (defined in RFC7665). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-18 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-18 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-18 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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03:00:08 -0400 From: "Carlos Pignataro (cpignata)" To: Service Function Chaining IETF list Thread-Topic: New Version Notification for draft-ietf-sfc-nsh-18.txt Thread-Index: AQHTBdsXxhLDRzDd0UKOwuj6dCcELg== Date: Wed, 26 Jul 2017 07:00:08 +0000 Message-ID: <510AFC69-7061-4C08-AD78-32100231530B@cisco.com> References: <150105166395.26505.395499002615018402.idtracker@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.7.20] Content-Type: multipart/alternative; boundary="_000_510AFC6970614C08AD7832100231530Bciscocom_" MIME-Version: 1.0 Archived-At: Subject: [sfc] Fwd: New Version Notification for draft-ietf-sfc-nsh-18.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 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Halpern" , Ron Parker , "Roberta Maglione (robmgl)" , James N Guichard CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgAEyaeV6AAq9ZcA= Date: Wed, 26 Jul 2017 07:07:43 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> , <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> <20170726015503.5103687.96388.25593@sandvine.com> In-Reply-To: <20170726015503.5103687.96388.25593@sandvine.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.100.101] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 07:07:48 -0000 I think that would be a good compromise. If that would swing some of the 5.= 4.1 folks over, then I'm in favor of such an idea. Kent =A0 -----Original Message----- From: Dave Dolson [mailto:ddolson@sandvine.com]=20 Sent: Tuesday, July 25, 2017 6:55 PM To: Kent Leung (kleung) ; Reinaldo Penno (repenno) ; Joel M. Halpern ; Ron Parker ; Roberta Maglione (robmgl) ; Jame= s N Guichard Cc: sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Are the 5.4.2 folks willing to consider using the lower bit for odd/even pa= irs instead of the upper bit? David Dolson Sandvine Original Message From: Kent Leung (kleung) Sent: Tuesday, July 25, 2017 6:32 PM To: Reinaldo Penno (repenno); Joel M. Halpern; Ron Parker; Dave Dolson; Rob= erta Maglione (robmgl); James N Guichard Cc: sfc@ietf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket It seems enough time has elapsed for folks to chime in their preferences on= the solution option. I believe that communication between two endpoints is based on flow traffic= from source to destination. A service path dictates which service function= s are applied for the traffic. Technically, a flow is terminated at the rec= eiving endpoint. So, the service path ended at the last hop. Communication = may be uni-directional (one flow) or bi-directional (two flows). RFC 7665 d= escribes SFC as steering of traffic flows through service functions. My int= erpretation is that the service path is associated with the flow. A new flo= w going in the reverse direction should be treated with a new service path = (set up to handle that flow) and not continuation of the same service path = (set up to handle original flow) in the forward direction. Seems logical to= me from that perspective. The service path ID is used to identify the service path and the service in= dex is used to identify the location within the service path as stated in c= urrent NSH draft: " NSH contains a Service Path Identifier (SPI) and a Service Index (SI). T= he SPI is, as per its name, an identifier" of the service path. "The Service Index provides an indication of location within a service path= ." Given that both options support asymmetric and symmetric SFCs, has anyone c= hange their mind on selecting an option to go forth? Based on the feedback,= it seems that we all agree to choose one solution instead of allowing mult= iple options for addressing reverse packet generation scenario. Now, what s= hould we need to do to achieve that? Rock-paper-scissor? :) Current count as Joel is OK with either option. Sect 5.4.1 (one service path ID, service index indicates flow direction): - (4) Dave, Joel, Ron, Kyle Sect 5.4.2 (two service path IDs, each indicate flow direction): - (7) Sumandra, Jim, Kent, Renaldo, Roberta, Paul, Joel Kent From nobody Wed Jul 26 00:39:16 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 52F7D131FBE for ; Wed, 26 Jul 2017 00:39:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.399 X-Spam-Level: X-Spam-Status: No, score=-5.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iMXoWbs1S7ZX for ; 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Thread-Topic: New Version Notification for draft-ietf-sfc-nsh-18.txt Thread-Index: AQHTBdsXxhLDRzDd0UKOwuj6dCcELqJltk5A Date: Wed, 26 Jul 2017 07:39:09 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A0130C6@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <150105166395.26505.395499002615018402.idtracker@ietfa.amsl.com> <510AFC69-7061-4C08-AD78-32100231530B@cisco.com> In-Reply-To: <510AFC69-7061-4C08-AD78-32100231530B@cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: multipart/alternative; boundary="_000_787AE7BB302AE849A7480A190F8B93300A0130C6OPEXCLILMA3corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] New Version Notification for draft-ietf-sfc-nsh-18.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 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Wed, 26 Jul 2017 10:39:02 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM7C.corporate.adroot.infra.ftgroup ([fe80::8007:17b:c3b4:d68b%19]) with mapi id 14.03.0352.000; Wed, 26 Jul 2017 10:39:02 +0200 From: To: "Kent Leung (kleung)" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAG6Xcmw Date: Wed, 26 Jul 2017 08:39:01 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A013139@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> In-Reply-To: <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: multipart/alternative; boundary="_000_787AE7BB302AE849A7480A190F8B93300A013139OPEXCLILMA3corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 08:39:08 -0000 --_000_787AE7BB302AE849A7480A190F8B93300A013139OPEXCLILMA3corp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Kent, FWIW, there was an attempt to define this term in https://tools.ietf.org/ht= ml/draft-boucadair-sfc-requirements-06. Below an excerpt from that draft: =3D=3D o Service Function Loop: If a Service Function Chain is structured to not invoke Service Functions multiple times, a loop is the error that occurs when the same Service Function is invoked several times when handling data bound to that Service Function Chain. In other words, a loop denotes an error that occurs when a packet handled by a Service Function, forwarded onwards, and arrives once again at that Service Function while this is not allowed by the Service Function Chain it is bound to. o Service Function Spiral: denotes a Service Function Chain in which data is handled by a Service Function, forwarded onwards, and arrives once again at that Service Function. * Note that some Service Functions support built-in functions to accommodate spirals; these service-specific functions may require that the data received in a spiral should differ in a way that will result in a different processing decision than the original data. This document does not make such assumption. * A Service Function Chain may involve one or more Service Function Spirals. * Unlike Service Function loop, spirals are not considered as errors. =3D=3D Cheers, Med De : sfc [mailto:sfc-bounces@ietf.org] De la part de Kent Leung (kleung) Envoy=E9 : lundi 17 juillet 2017 15:37 =C0 : Dave Dolson; Roberta Maglione (robmgl); James N Guichard Cc : sfc@ietf.org Objet : Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pack= et Why can't there be stats for per SPI and more granular stats for per SPI/SI= ? They seem to serve different purposes. The former is providing counters f= or all flows in each service path. The latter is provide counters for all f= lows served at each hop in the service path. Can you explain the "spiral" scenario and how that pertains to usefulness o= f having per service path stats? Thanks. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 3:01 PM To: Roberta Maglione (robmgl) >; = James N Guichard > Cc: Kent Leung (kleung) >; sfc@ie= tf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_787AE7BB302AE849A7480A190F8B93300A013139OPEXCLILMA3corp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Kent,

 

FWIW, there was an attempt to d= efine this term in https://tools.ietf.org/html/draft-boucadair-sfc-requirements-06. Below= an excerpt from that draft:  

 

=3D=3D

   o  Service Function Loop:= If a Service Function Chain is structured

      to not invok= e Service Functions multiple times, a loop is the

      error that o= ccurs when the same Service Function is invoked

      several time= s when handling data bound to that Service Function

      Chain. = In other words, a loop denotes an error that occurs when a

      packet handl= ed by a Service Function, forwarded onwards, and

      arrives once= again at that Service Function while this is not

      allowed by t= he Service Function Chain it is bound to.

 

   o  Service Function Spira= l: denotes a Service Function Chain in which

      data is hand= led by a Service Function, forwarded onwards, and

      arrives once= again at that Service Function.

 

      *  Note= that some Service Functions support built-in functions to

       &= nbsp; accommodate spirals; these service-specific functions may<= /span>

       &= nbsp; require that the data received in a spiral should differ in a

       &= nbsp; way that will result in a different processing decision than

       &= nbsp; the original data.  This document does not make such<= /span>

       &= nbsp; assumption.

 

      *  A Se= rvice Function Chain may involve one or more Service

       &= nbsp; Function Spirals.

 

      *  Unli= ke Service Function loop, spirals are not considered as

       &= nbsp; errors.

=3D=3D

 

Cheers,

Med

 

De : sfc = [mailto:sfc-bounces@ietf.org] De la part de Kent Leung (kleung)
Envoy=E9 : lundi 17 juillet 2017 15:37
=C0 : Dave Dolson; Roberta Maglione (robmgl); James N Guichard<= br> Cc : sfc@ietf.org
Objet : Re: [sfc] clarification on Service Path ID for draft-pe= nno-sfc-packet

 

Why can’t there be stats for per SPI and more gr= anular stats for per SPI/SI? They seem to serve different purposes. The for= mer is providing counters for all flows in each service path. The latter is provide counters for all flows served at each = hop in the service path.

&n= bsp;

Can you= explain the “spiral” scenario and how that pertains to usefuln= ess of having per service path stats? Thanks.

&n= bsp;

Kent

&n= bsp;

&n= bsp;

From: Dave Dolson [mailto:ddo= lson@sandvine.com]
Sent: Monday, July 17, 2017 3:01 PM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; James N Guichard <james.n.guichard@huawei.com>
Cc: Kent Leung (kleung) <kleu= ng@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Strictl= y, stats should be per SPI and SI, in order to support the so-called spiral= .

But I c= an see how folks might find the lazy implementation to be useful.

&n= bsp;

From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspe= ct: having different SPI's for each direction simplifies the troubleshootin= g procedures, as statistics on the packets counters for each direction on e= ach SF, can be displayed just based on SPI.

Regards,

Roberta 

Inviato da iPad

=
Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes und= erstood but I was assuming no manipulation of the SI and my point was more = from an operational perspective; if I use the same path ID in both directio= ns then I cannot immediately tell in which direction the packets are flowing unless I go one step deeper and look at = the SI leading to a correlation of SPI + SI to be able to figure out my= traffic matrix. Not so if the SPI is uni-directional.

 <= /span>

Jim

 <= /span>

From: Dave Dolson [mailto:ddo= lson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There i= s not actually forwarding ambiguity, since SFF forwarding depends on *bo= th* SPI and SI.

So for = example, there is no ambiguity in forwarding to use SI in the range [0,127]= of up-link and range [128,255] for down-link, on the same SPI.

The lim= itation is ~127 SFs per path instead of ~255.

 <= /span>

As I se= e it, Kent’s question is one of aesthetics. Do folks like the same SP= I used for two directions?

 <= /span>

Persona= lly, I find use of a single SPI to be more elegant,  consuming only on= e path ID instead of two. (section 5.4.1).=

It may = make debugging easier as well.

 <= /span>

Also, f= or what it’s worth, we demonstrated this method of section 5.4.1 at a= previous IETF hackathon.

 <= /span>

-Dave

 <= /span>

 <= /span>

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent= ,

 <= /span>

[person= al opinion …] I have always assumed that the service path ID would be= uni-directional given that it would be difficult to avoid collision in all= forwarding scenarios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c= (which imho will be the normal practice) then at b you would have a confli= ct if the same service path ID is used in both directions.

 <= /span>

Jim

 <= /span>

From: sfc [mailto:sfc-bounces= @ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revisio= n for this draft. There were 4 proposed solution options in section 5. Duri= ng some discussions, most folks seem to favor the use of algorithmic method= in section 5.4. However, there are 2 sub-options. One is based on same Service Path ID and using Service Inde= x to determine flow direction (sect. 5.4.1). The other is based on setting = high order bit on Serve Path ID, which determines flow direction (sect. 5.4= .2). There are mixed opinions. One reason is that there may be the assumption the Service Path ID is uni-dire= ctional. No explicit wording of that nature has been encountered in the RFC= s, maybe we missed something?

 

If Serve Path ID is required to= be uni-directional, then the answer is easy (=3D> 5.4.2). We would like= to solicit WG comments to get rough consensus and revised the next version= with that solution. This problem is critical to address for Service Function that generate packet in reverse direction,= especially security service functions as mentioned in draft-wang-sfc-ns-us= e-cases.

 

Thanks.

 

Kent

_____________________= __________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc=

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E=Sophos;i="5.40,416,1496102400"; d="scan'208,217";a="277861940" Received: from rcdn-core-12.cisco.com ([173.37.93.148]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2017 15:31:15 +0000 Received: from XCH-RTP-010.cisco.com (xch-rtp-010.cisco.com [64.101.220.150]) by rcdn-core-12.cisco.com (8.14.5/8.14.5) with ESMTP id v6QFVFj8012630 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 26 Jul 2017 15:31:15 GMT Received: from xch-rtp-006.cisco.com (64.101.220.146) by XCH-RTP-010.cisco.com (64.101.220.150) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 26 Jul 2017 11:31:14 -0400 Received: from xch-rtp-006.cisco.com ([64.101.220.146]) by XCH-RTP-006.cisco.com ([64.101.220.146]) with mapi id 15.00.1210.000; Wed, 26 Jul 2017 11:31:14 -0400 From: "Kent Leung (kleung)" To: "mohamed.boucadair@orange.com" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAG6XcmwAA5o7rA= Date: Wed, 26 Jul 2017 15:31:14 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> , <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <787AE7BB302AE849A7480A190F8B93300A013139@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A013139@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.100.101] Content-Type: multipart/alternative; boundary="_000_dfa5aff1dc4348f496942fd6312c00b7XCHRTP006ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 15:31:20 -0000 --_000_dfa5aff1dc4348f496942fd6312c00b7XCHRTP006ciscocom_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Mohamed. Thanks for the reference. Dave did explain "spiral" as describe= d below. Kent From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of mohamed.boucadair@oran= ge.com Sent: Wednesday, July 26, 2017 1:39 AM To: Kent Leung (kleung) Cc: sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, FWIW, there was an attempt to define this term in https://tools.ietf.org/ht= ml/draft-boucadair-sfc-requirements-06. Below an excerpt from that draft: =3D=3D o Service Function Loop: If a Service Function Chain is structured to not invoke Service Functions multiple times, a loop is the error that occurs when the same Service Function is invoked several times when handling data bound to that Service Function Chain. In other words, a loop denotes an error that occurs when a packet handled by a Service Function, forwarded onwards, and arrives once again at that Service Function while this is not allowed by the Service Function Chain it is bound to. o Service Function Spiral: denotes a Service Function Chain in which data is handled by a Service Function, forwarded onwards, and arrives once again at that Service Function. * Note that some Service Functions support built-in functions to accommodate spirals; these service-specific functions may require that the data received in a spiral should differ in a way that will result in a different processing decision than the original data. This document does not make such assumption. * A Service Function Chain may involve one or more Service Function Spirals. * Unlike Service Function loop, spirals are not considered as errors. =3D=3D Cheers, Med De : sfc [mailto:sfc-bounces@ietf.org] De la part de Kent Leung (kleung) Envoy=E9 : lundi 17 juillet 2017 15:37 =C0 : Dave Dolson; Roberta Maglione (robmgl); James N Guichard Cc : sfc@ietf.org Objet : Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pack= et Why can't there be stats for per SPI and more granular stats for per SPI/SI= ? They seem to serve different purposes. The former is providing counters f= or all flows in each service path. The latter is provide counters for all f= lows served at each hop in the service path. Can you explain the "spiral" scenario and how that pertains to usefulness o= f having per service path stats? Thanks. Kent From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Monday, July 17, 2017 3:01 PM To: Roberta Maglione (robmgl) >; = James N Guichard > Cc: Kent Leung (kleung) >; sfc@ie= tf.org Subject: RE: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Strictly, stats should be per SPI and SI, in order to support the so-called= spiral. But I can see how folks might find the lazy implementation to be useful. From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com] Sent: Monday, July 17, 2017 11:00 AM To: James N Guichard Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket I agree on the operational aspect: having different SPI's for each directio= n simplifies the troubleshooting procedures, as statistics on the packets c= ounters for each direction on each SF, can be displayed just based on SPI. Regards, Roberta Inviato da iPad Il giorno 15 lug 2017, alle ore 01:09, James N Guichard > ha scritto: Yes understood but I was assuming no manipulation of the SI and my point wa= s more from an operational perspective; if I use the same path ID in both d= irections then I cannot immediately tell in which direction the packets are= flowing unless I go one step deeper and look at the SI leading to a correl= ation of SPI + SI to be able to figure out my traffic matrix. Not so if the= SPI is uni-directional. Jim From: Dave Dolson [mailto:ddolson@sandvine.com] Sent: Friday, July 14, 2017 2:51 PM To: James N Guichard >; Kent Leung (kleung) = >; sfc@ietf.org Subject: RE: clarification on Service Path ID for draft-penno-sfc-packet There is not actually forwarding ambiguity, since SFF forwarding depends on= *both* SPI and SI. So for example, there is no ambiguity in forwarding to use SI in the range = [0,127] of up-link and range [128,255] for down-link, on the same SPI. The limitation is ~127 SFs per path instead of ~255. As I see it, Kent's question is one of aesthetics. Do folks like the same S= PI used for two directions? Personally, I find use of a single SPI to be more elegant, consuming only = one path ID instead of two. (section 5.4.1). It may make debugging easier as well. Also, for what it's worth, we demonstrated this method of section 5.4.1 at = a previous IETF hackathon. -Dave From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard Sent: Friday, July 14, 2017 2:25 PM To: Kent Leung (kleung); sfc@ietf.org Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-pac= ket Hi Kent, [personal opinion ...] I have always assumed that the service path ID would= be uni-directional given that it would be difficult to avoid collision in = all forwarding scenarios. If you look at a basic SFC a-b-c and the service = index is set to 255 at the classifiers a & c (which imho will be the normal= practice) then at b you would have a conflict if the same service path ID = is used in both directions. Jim From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung) Sent: Friday, July 14, 2017 1:58 PM To: sfc@ietf.org Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Hi. We are working on a revision for this draft. There were 4 proposed solu= tion options in section 5. During some discussions, most folks seem to favo= r the use of algorithmic method in section 5.4. However, there are 2 sub-op= tions. One is based on same Service Path ID and using Service Index to dete= rmine flow direction (sect. 5.4.1). The other is based on setting high orde= r bit on Serve Path ID, which determines flow direction (sect. 5.4.2). Ther= e are mixed opinions. One reason is that there may be the assumption the Se= rvice Path ID is uni-directional. No explicit wording of that nature has be= en encountered in the RFCs, maybe we missed something? If Serve Path ID is required to be uni-directional, then the answer is easy= (=3D> 5.4.2). We would like to solicit WG comments to get rough consensus = and revised the next version with that solution. This problem is critical t= o address for Service Function that generate packet in reverse direction, e= specially security service functions as mentioned in draft-wang-sfc-ns-use-= cases. Thanks. Kent _______________________________________________ sfc mailing list sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc --_000_dfa5aff1dc4348f496942fd6312c00b7XCHRTP006ciscocom_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Mohamed. Thanks for the reference. Dave did explain “spiral&= #8221; as described below.

 

Kent

 

From: sfc [mailto:sfc-bounces@ietf.org] On= Behalf Of mohamed.boucadair@orange.com
Sent: Wednesday, July 26, 2017 1:39 AM
To: Kent Leung (kleung) <kleung@cisco.com>
Cc: sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

FWIW, there was an attempt to define thi= s term in https://tools.ietf.org/html/draft-boucadair-sfc-requirements-06. Below= an excerpt from that draft:  

 

=3D=3D

   o  Service Function Loop: If a Ser= vice Function Chain is structured

      to not invoke Service= Functions multiple times, a loop is the

      error that occurs whe= n the same Service Function is invoked

      several times when ha= ndling data bound to that Service Function

      Chain.  In other= words, a loop denotes an error that occurs when a

      packet handled by a S= ervice Function, forwarded onwards, and

      arrives once again at= that Service Function while this is not

      allowed by the Servic= e Function Chain it is bound to.

 

   o  Service Function Spiral: denote= s a Service Function Chain in which

      data is handled by a = Service Function, forwarded onwards, and

      arrives once again at= that Service Function.

 

      *  Note that som= e Service Functions support built-in functions to

         acc= ommodate spirals; these service-specific functions may

         req= uire that the data received in a spiral should differ in a

         way= that will result in a different processing decision than=

         the= original data.  This document does not make such

         ass= umption.

 

      *  A Service Fun= ction Chain may involve one or more Service

         Fun= ction Spirals.

 

      *  Unlike Servic= e Function loop, spirals are not considered as

         errors.

=3D=3D

 

Cheers,

Med

 

De : sfc = [mailto:sfc-bounces@ietf.org] De la part de Kent Leung (kleung)
Envoy=E9 : lundi 17 juillet 2017 15:37
=C0 : Dave Dolson; Roberta Maglione (robmgl); James N Guichard<= br> Cc : sfc@ietf.org
Objet : Re: [sfc] clarification on Service Path ID for draft-pe= nno-sfc-packet

 

Why can’t there = be stats for per SPI and more granular stats for per SPI/SI? They seem to s= erve different purposes. The former is providing counters for all flows in = each service path. The latter is provide counters for all flows served at each hop in the service path.

 

Can you explain the &#= 8220;spiral” scenario and how that pertains to usefulness of having p= er service path stats? Thanks.

 

Kent=

 

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Monday, July 17, 2017 3:01 PM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; James N Guichard <james.n.guichard@huawei.com>
Cc: Kent Leung (kleung) <kleu= ng@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Strictly, stats should= be per SPI and SI, in order to support the so-called spiral.

But I can see how folk= s might find the lazy implementation to be useful.

 

From: Roberta Maglione (robmgl) [mailto:robmgl@cisco.com]
Sent: Monday, July 17, 2017 11:00 AM
To: James N Guichard
Cc: Dave Dolson; Kent Leung (kleung); sfc@ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

I agree on the operational aspect: having different = SPI's for each direction simplifies the troubleshooting procedures, as stat= istics on the packets counters for each direction on each SF, can be displa= yed just based on SPI.

Regards,

Roberta 

Inviato da iPad


Il giorno 15 lug 2017, alle ore 01:09, James N Guichard <james.n.guichard@huawei.com> ha scri= tto:

Yes understood but I w= as assuming no manipulation of the SI and my point was more from an operati= onal perspective; if I use the same path ID in both directions then I canno= t immediately tell in which direction the packets are flowing unless I go one step deeper and look at the SI lea= ding to a correlation of SPI + SI to be able to figure out my traffic m= atrix. Not so if the SPI is uni-directional.

 

Jim<= /p>

 

From: Dave Dolson [mailto:ddolson@sandvine.com]
Sent: Friday, July 14, 2017 2:51 PM
To: James N Guichard <james.n.guichard@huawei.com>; Kent Leung (kleung) <kleung@cisco.com>; sfc@ietf.org
Subject: RE: clarification on Service Path ID for draft-penno-sfc-pa= cket

 

There is not actually = forwarding ambiguity, since SFF forwarding depends on *both* SPI and= SI.

So for example, there = is no ambiguity in forwarding to use SI in the range [0,127] of up-link and= range [128,255] for down-link, on the same SPI.

The limitation is ~127= SFs per path instead of ~255.

 

As I see it, Kent̵= 7;s question is one of aesthetics. Do folks like the same SPI used for two = directions?

 

Personally, I find use= of a single SPI to be more elegant,  consuming only one path ID inste= ad of two. (section 5.4.1).

It may make debugging = easier as well.

 

Also, for what it̵= 7;s worth, we demonstrated this method of section 5.4.1 at a previous IETF = hackathon.

 

-Dave

 

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of James N Guichard
Sent: Friday, July 14, 2017 2:25 PM
To: Kent Leung (kleung); sfc@= ietf.org
Subject: Re: [sfc] clarification on Service Path ID for draft-penno-= sfc-packet

 

Hi Kent,

 

[personal opinion R= 30;] I have always assumed that the service path ID would be uni-directiona= l given that it would be difficult to avoid collision in all forwarding sce= narios. If you look at a basic SFC a-b-c and the service index is set to 255 at the classifiers a & c (which imho w= ill be the normal practice) then at b you would have a conflict if the same= service path ID is used in both directions.

 

Jim<= /p>

 

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Kent Leung (kleung)
Sent: Friday, July 14, 2017 1:58 PM
To: sfc@ietf.org
Subject: [sfc] clarification on Service Path ID for draft-penno-sfc-= packet

 

Hi. We are working on a revision for this draft. The= re were 4 proposed solution options in section 5. During some discussions, = most folks seem to favor the use of algorithmic method in section 5.4. Howe= ver, there are 2 sub-options. One is based on same Service Path ID and using Service Index to determine flow= direction (sect. 5.4.1). The other is based on setting high order bit on S= erve Path ID, which determines flow direction (sect. 5.4.2). There are mixe= d opinions. One reason is that there may be the assumption the Service Path ID is uni-directional. No explicit = wording of that nature has been encountered in the RFCs, maybe we missed so= mething?

 

If Serve Path ID is required to be uni-directional, = then the answer is easy (=3D> 5.4.2). We would like to solicit WG commen= ts to get rough consensus and revised the next version with that solution. = This problem is critical to address for Service Function that generate packet in reverse direction, especially sec= urity service functions as mentioned in draft-wang-sfc-ns-use-cases.

 

Thanks.

 

Kent

_______________________________________________<= br> sfc mailing list
sfc@ietf.org
https://ww= w.ietf.org/mailman/listinfo/sfc

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12:08:00 -0400 From: "Kent Leung (kleung)" To: "mohamed.boucadair@orange.com" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgAFBR0jgAA2kEDA= Date: Wed, 26 Jul 2017 16:08:00 +0000 Message-ID: <93596249c1e04032ae66695bd90868dd@XCH-RTP-006.cisco.com> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> <787AE7BB302AE849A7480A190F8B93300A01326E@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A01326E@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.100.101] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 16:08:05 -0000 SGkgTW9oYW1lZC4gU2VlIGNvbW1lbnRzIGJlbG93Lg0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2Ut LS0tLQ0KRnJvbTogbW9oYW1lZC5ib3VjYWRhaXJAb3JhbmdlLmNvbSBbbWFpbHRvOm1vaGFtZWQu Ym91Y2FkYWlyQG9yYW5nZS5jb21dIA0KU2VudDogV2VkbmVzZGF5LCBKdWx5IDI2LCAyMDE3IDQ6 MjIgQU0NClRvOiBLZW50IExldW5nIChrbGV1bmcpIDxrbGV1bmdAY2lzY28uY29tPg0KQ2M6IHNm 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LCBzZXJ2aWNlIGluZGV4IGluZGljYXRlcyBmbG93IGRpcmVjdGlvbik6DQo+IA0KPiAtCSg0KSBE YXZlLCBKb2VsLCBSb24sIEt5bGUNCj4gDQo+IFNlY3QgNS40LjIgKHR3byBzZXJ2aWNlIHBhdGgg SURzLCBlYWNoIGluZGljYXRlIGZsb3cgZGlyZWN0aW9uKToNCj4gDQo+IC0JKDcpIFN1bWFuZHJh LCBKaW0sIEtlbnQsIFJlbmFsZG8sIFJvYmVydGEsIFBhdWwsIEpvZWwNCj4gDQo+IEtlbnQNCj4g DQo+IDxzbmlwPg0KPiANCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18NCj4gc2ZjIG1haWxpbmcgbGlzdA0KPiBzZmNAaWV0Zi5vcmcNCj4gaHR0cHM6Ly93 d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby9zZmMNCg== From nobody Wed Jul 26 12:56:09 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 87AF2127136 for ; Wed, 26 Jul 2017 12:56:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.702 X-Spam-Level: X-Spam-Status: No, score=-2.702 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, 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h=Subject:References:To:From:Date:In-Reply-To:From; b=Xct5HWumQt8+zkQdcQGrmZ+ZQZHTajBmPXUekuv70HC+7avMVmCoGGS1Y5AygCg+d hngQ+1I8k7ZRLrj5sJUSq23h1AiWyZ6WLqD+Eju8p2NjOO9W2hrHSC4oN+Bu8uHLkx 8iUKv3gKZazEY+5XHVvhIcIjfSObJQDN9mkSCXa0= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [207.236.147.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 6DC921C0682 for ; Wed, 26 Jul 2017 12:56:06 -0700 (PDT) References: <150109879962.23218.2325395869719241311.idtracker@ietfa.amsl.com> To: "sfc@ietf.org" From: "Joel M. Halpern" X-Forwarded-Message-Id: <150109879962.23218.2325395869719241311.idtracker@ietfa.amsl.com> Message-ID: <0d404808-4432-4b02-3c66-40aa85644d38@joelhalpern.com> Date: Wed, 26 Jul 2017 15:56:06 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <150109879962.23218.2325395869719241311.idtracker@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] Fwd: IETF WG state changed for draft-ietf-sfc-nsh X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 19:56:09 -0000 As per the earlier discussions on the email list, and the discussions at the meeting, the editor has made revisions to reflect the WG final comments. In consultation with my co-chair, we have forwarded the document to our AD (Alia Atlas) for IETF last call and IESG approval. Thank you for your continued engagement, Yours, Joel -------- Forwarded Message -------- Subject: IETF WG state changed for draft-ietf-sfc-nsh Date: Wed, 26 Jul 2017 12:53:19 -0700 From: IETF Secretariat To: draft-ietf-sfc-nsh@ietf.org, jmh@joelhalpern.com, sfc-chairs@ietf.org The IETF WG state of draft-ietf-sfc-nsh has been changed to "WG Consensus: Waiting for Write-Up" from "Waiting for WG Chair Go-Ahead" by Joel Halpern: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/ From nobody Wed Jul 26 23:36:26 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 979831293E1 for ; Wed, 26 Jul 2017 23:36:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oA_fYXRYfCnf for ; Wed, 26 Jul 2017 23:36:23 -0700 (PDT) Received: from relais-inet.orange.com (mta239.mail.business.static.orange.com [80.12.66.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 751E2120227 for ; Wed, 26 Jul 2017 23:36:23 -0700 (PDT) Received: from opfedar02.francetelecom.fr (unknown [xx.xx.xx.4]) by opfedar23.francetelecom.fr (ESMTP service) with ESMTP id D9BF516082F; Thu, 27 Jul 2017 08:36:21 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.32]) by opfedar02.francetelecom.fr (ESMTP service) with ESMTP id B9DD2180063; Thu, 27 Jul 2017 08:36:21 +0200 (CEST) Received: from OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541]) by OPEXCLILM32.corporate.adroot.infra.ftgroup ([fe80::8924:188:2124:a046%19]) with mapi id 14.03.0352.000; Thu, 27 Jul 2017 08:36:21 +0200 From: To: "Kent Leung (kleung)" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgAFBR0jgAA2kEDAAHp9kAA== Date: Thu, 27 Jul 2017 06:36:21 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A013955@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> <787AE7BB302AE849A7480A190F8B93300A01326E@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <93596249c1e04032ae66695bd90868dd@XCH-RTP-006.cisco.com> In-Reply-To: <93596249c1e04032ae66695bd90868dd@XCH-RTP-006.cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Jul 2017 06:36:25 -0000 SGkgS2VudCwgDQoNClBsZWFzZSBzZWUgaW5saW5lLiANCg0KQ2hlZXJzLA0KTWVkDQoNCj4gLS0t LS1NZXNzYWdlIGQnb3JpZ2luZS0tLS0tDQo+IERlwqA6IEtlbnQgTGV1bmcgKGtsZXVuZykgW21h 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ZWN0aW9uKToNCj4gPg0KPiA+IC0JKDQpIERhdmUsIEpvZWwsIFJvbiwgS3lsZQ0KPiA+DQo+ID4g U2VjdCA1LjQuMiAodHdvIHNlcnZpY2UgcGF0aCBJRHMsIGVhY2ggaW5kaWNhdGUgZmxvdyBkaXJl Y3Rpb24pOg0KPiA+DQo+ID4gLQkoNykgU3VtYW5kcmEsIEppbSwgS2VudCwgUmVuYWxkbywgUm9i ZXJ0YSwgUGF1bCwgSm9lbA0KPiA+DQo+ID4gS2VudA0KPiA+DQo+ID4gPHNuaXA+DQo+ID4NCj4g PiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiA+IHNm YyBtYWlsaW5nIGxpc3QNCj4gPiBzZmNAaWV0Zi5vcmcNCj4gPiBodHRwczovL3d3dy5pZXRmLm9y Zy9tYWlsbWFuL2xpc3RpbmZvL3NmYw0K From nobody Fri Jul 28 07:34:23 2017 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 764E5129B40; Fri, 28 Jul 2017 07:34:15 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.57.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150125245534.25299.2250477361270542672@ietfa.amsl.com> Date: Fri, 28 Jul 2017 07:34:15 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-aggregation-00.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Jul 2017 14:34:15 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining WG of the IETF. Title : A Service Chain Aggregation Architecture Authors : Huan Yan Yong Li Haiyang Sun Chunshan Xiong Depeng Jin Filename : draft-ietf-sfc-aggregation-00.txt Pages : 5 Date : 2017-07-27 Abstract: Service chains specifying the ordered sequences of network functions according to network policies requested, play a very important role in improving network performance in most networks. With the introduction of Software-Defined Networking (SDN) and Network Function Virtualization (NFV) technologies, service chains can be immediately deployed in more effective ways. Since different customers or operators would request multiple service chains in the same network but different administrative domains, and the multiple service chains may apply to the same network connection, we propose a service chain aggregation architecture that has ability to effectively aggregate them before the deployment. In this architecture, we determine the aggregating order of service chains according to different conditions verifying the aggregation effectiveness. The benefits of our architecture are 1) security, 2) network resource (e.g., flow entries in switches) savings and 3) scalability. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-aggregation/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-aggregation-00 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-aggregation-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Jul 28 14:25:15 2017 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CC642132186 for ; Fri, 28 Jul 2017 14:25:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with 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2017 17:25:09 -0400 From: "Kent Leung (kleung)" To: "mohamed.boucadair@orange.com" CC: "sfc@ietf.org" Thread-Topic: [sfc] clarification on Service Path ID for draft-penno-sfc-packet Thread-Index: AdL8yGj6ijlxPpxFQhyonVi4uiBr2QABYlRQAACi1WAACSYE0ACB4IoAAAAW/OAAAPzOEAAJX2uAAB8CJ2AAEaQ9gAABme4AAAB5TAAAHJ0cEAAWlowAAAJ3zwAACCSfgAFBR0jgAA2kEDAAHp9kAABQqBeA Date: Fri, 28 Jul 2017 21:25:09 +0000 Message-ID: References: <91d8a4564df24299a24bee2688c9f6a6@XCH-RTP-006.cisco.com> <99da3de545b142f5b9400f808f418fa1@XCH-RTP-006.cisco.com> <7B36C41A-EBE1-453E-BB25-04377E63B559@cisco.com> <6a0788234fec45909112016317e149fd@XCH-RTP-006.cisco.com> <6fa79c3c-6ae7-7818-47b3-1c71de2f0c50@joelhalpern.com> <03cda27203ec4cc0b8c8cca7ffab2cad@XCH-RTP-006.cisco.com> <5b0089f70075435d8b2b6e4dc512770d@XCH-RTP-006.cisco.com> <787AE7BB302AE849A7480A190F8B93300A01326E@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <93596249c1e04032ae66695bd90868dd@XCH-RTP-006.cisco.com> <787AE7BB302AE849A7480A190F8B93300A013955@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A013955@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.38.174] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] clarification on Service Path ID for draft-penno-sfc-packet X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Jul 2017 21:25:14 -0000 SGkgTWVkLiBUaGFua3MgZm9yIGNsYXJpZnlpbmcgd2l0aCB0aGUgTVBUQ1AgZXhhbXBsZS4NCg0K SW4gZ2VuZXJhbCwgZHJhZnQtd2FuZy1zZmMtbnMtdXNlLWNhc2VzIGNvdmVycyB0aGUgdHdvIGZ1 bmRhbWVudGFsIHVzZSBjYXNlcyBpbiBzZWN0cyA0LjMuMSBhbmQgNC4zLjIuIFRoZSBzb2x1dGlv 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