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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "routing-discussion@ietf.org" <routing-discussion@ietf.org>, "rtg-chairs@ietf.org" <rtg-chairs@ietf.org>
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Thread-Topic: Change of Affiliation (Alvaro Retana)
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From nobody Mon Oct  2 22:52:51 2017
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From: Tomonori Takeda <tomonori.takeda@ntt.com>
To: "'TARAPORE, PERCY S'" <pt5947@att.com>, "rtg-ads@ietf.org" <rtg-ads@ietf.org>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "BRUNGARD, DEBORAH A" <db3546@att.com>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-spring-lsp-ping.authors@ietf.org" <draft-ietf-mpls-spring-lsp-ping.authors@ietf.org>
Thread-Topic: draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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Date: Wed, 4 Oct 2017 08:53:38 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/Ml12XED5AMT2W77Qr84QVo9_9YU>
Subject: [RTG-DIR] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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Deborah and all,

I have read the latest (-11) version of the draft in order to check to whi=
ch extent my RTG-DIR review comments (that referred to the -06 version of =
the draft) have been addressed.

Here are the results of this check:

Major Issue #1 in the -06 version of the draft:
Section 7.4 "Segment ID Check" of the draft claims to update "the procedur=
e defined in Step 6 of Section 4.4  of [RFC8029]". However, I have failed =
to integrate the logic defined by the pseudocode in this section with the =
logic defined by the referenced pseudocode.

-          I have suspected that the newly introduced logic should be part=
 of the Egress FEC Validation logic defined in Section 4.4.1 of RFC 8029. =
 This suspicion has been acknowledged by the authors, and they plan to fix=
 the wrong reference in the next revision of the draft.

-          From my POV the best way to avoid possible misinterpretation by=
 the implementers would be inclusion of the updated version of the pseudoc=
ode (with explicit marking of the new logic)=20directly in the document. I=
 have suggested this to the authors, but I did not get their response so f=
ar.

Status in the -11 version of the draft:
The problematic text has been replaced with pseudocode that integrates the=
 logic that has been defined in Section 4.4.1 of RFC 8029 with the new, SR=
-specific pseudocode. So, in a way, the original issue has been resolved. =
However, I have several issues with the current text:

-          From my POV, the pseudocode could be made much more readable if=
 it were better structured. One possible way to do so could be defining ho=
w IGP extensions for SR can be treated as distributing if they distributed=
 labels (including Implicit Null) for Node Segment IDs, and using the resu=
lts in the original pseudocode of RFC 8029

-          The proposed pseudocode seems to lack the check of Label-L matc=
hing the Node Segment ID in the SRGB of the responder

-          It is not obvious how the proposed pseudocode treats previously=
 defined FECs in the target FEC stack

-          Interface-I (the ingress interface of the received LSP Ping req=
uest) is only mentioned in the check of Adjacency SID. It is also not clea=
r to me why the check expects its match with the Remote Interface ID in th=
e Adjacency SID TLV.
I did not raise these issues in my original review exactly because it was =
impossible to integrate the new validation logic with the logic defined in=
 RFC 8029. Please consider these issues as my IESG LC comments.

Major Issue #2 in the -06 version of the draft:
I agree with the previous reviewer regarding the mismatch between the (pre=
sumed) claim and the actual scope covered by the draft. To the best of my =
understanding, the authors have already agreed to fix this in the next rev=
ision of the draft.
Status in the -11 version of the draft:
The title of the draft has been changed to reflect its actual scope, and b=
oth the Abstract and Introduction clearly indicate that only IGP IP Prefix=
 and Adjacency SIDs are covered by the draft. From my POV, this is suffici=
ent, and this issue is resolved.

Minor Issue #1 in the -06 version of the draft:
I wonder why the authors place such an emphasis on Service labels (which, =
AFAIK, have not been defined in any level of detail anywhere so far) - the=
se labels are mentioned in Sections 4.2, 5 (that mentions them as "Service=
 segments")  and 8, while so many types of Segment IDs that are already we=
ll defined both in the SRPING WG documents and in the extensions of the re=
levant routing protocols are left out of scope of the draft.  The authors =
have acknowledged this and plan to fix this issue (probably by removing th=
e Service labels completely).
Status in the -11 version of the draft:
Service labels and service segments do not appear in the new version of th=
e draft.

Minor Issue #2 in the -06 version of the draft:
The description of possible data plane malfunctions in section 4.1 seems t=
o assume that all the nodes in the referenced topology (shown in Figure 1)=
 us the same SRGB. If this assumption (which is not explicitly mentioned) =
is not correct, the LSP Ping Echo request packets would not be "delivered =
to their expected destinations but not via the expected path" (as the text=
 in this section claims). I suggest making any such assumptions explicit i=
n the text.
Status in the -11 version of the draft:
The new text of section 4.1 explicitly mentions the assumption about same =
SRGB.

Minor Issue #3 in the -06 version of the draft:
I am not sure if "OSPF" and ISIS" (without any reference to Segment Routin=
g) are the proper names for the label distribution protocols in the propos=
ed new IANA registry in Section 10.2. From my POV "OSPF/ISIS SR Extensions=
" would be more appropriate. The authors disagree with this proposal claim=
ing that OSPF and ISIS are not used for label distribution in any other wa=
y. (RFC 8029 that encodes the label distribution protocol in the Downstrea=
m  Detailed Mapping TLV did not request a dedicated registry for this purp=
ose, and I think that the authors have been right to request such a regist=
ry).
Status in the -11 version of the draft:
The new version uses the same protocol names as the previous one. Meanwhil=
e, I have found that OSPF and IS-IS can be used for distriburing label ran=
ges for BIER (see OSPF Extensions for BIER<https://datatracker.ietf.org/do=
c/draft-ietf-bier-ospf-bier-extensions/?include_text=3D1> and a similar dr=
aft for ISIS). From my POV, this supports my recommendation to change the =
names of protocols to differentiate between multiple extensions to OSPF an=
d IS-IS that distribute label ranges. Please consider this as my IESG LC W=
G comment.

Minor Issue #4 in the -06 version of the draft:
I doubt the draft needs address any FRR issues even in future (as mentione=
d in the last statement in Section 5), since, to the best of my understand=
ing, any form of FRR:

-          Is operated locally by the node that is upstream to the failure=
 without passing any information to the initiator of LSP-Ping Request pack=
ets

-          In any case is just a transient state in the (presumably short)=
 interval between the failure being detected by the upstream node and re-c=
onvergence of IGP
I also think that references to "future versions" are not quite appropriat=
e in the document that is going to the IETF LC. I recommend removing any s=
uch references from the document.
Status in the -11 version of the draft:
All mention of FRR has been removed from the new version, as well as any r=
eferences to future versions.

Minor Issue #5 in the -06 version of the draft:
Section 9 "Backward Compatibility with non-Segment Routing devices" define=
s the behavior for the two slightly different use cases:
-              LSP Ping Echo Request packets are initiated by an SR-capabl=
e node (and therefore their target FEC stack contains SR-related FECs), wh=
ile the responder is legacy device that is not SR-capable. In this case th=
e proposed solution (respond with the FEC-return-code "Replying router has=
 no mapping for the FEC at stack-depth") looks as the only possibility sin=
ce the legacy device cannot parse SR FECs in any case
-              LSP Ping Echo Request packets are initiated by a legacy dev=
ice while the responder is SR-capable. The draft defines the same behavior=
 in this case - but, IMHO and FWIW, the responder could provide slightly b=
etter diagnostics since it can parse the "old" target FEC and recognize th=
e equivalent Node ID. An additional return code would be required to imple=
ment this behavior.
This issue has not been discussed with the authors due to lack of time.
Status in the -11 version of the draft:
The authors have responded that a legacy (LDP-only) initiator of LSP Pings=
 request messages in any case would not be able to parse a new return code=
. I agree with this comment, and withdraw the issue.

All the nits I've noticed also have been resolved. In particular, early IA=
NA allocations that have expired on 15.09.17, have been extended to one mo=
re year.


Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Deborah and all,<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I have read the lates=
t (-11) version of the draft in order to check to which extent my RTG-DIR =
review comments (that referred to the -06 version of the draft) have been =
addressed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Here are the results =
of this check:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Major Issue #1 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">Section 7.4 &#8220;Segment ID Check&#8221; of the draft claims to =
update &#8220;the procedure defined in Step 6 of Section 4.4&nbsp; of [RFC=
8029]&#8221;. However, I have failed to integrate the logic defined by
 the pseudocode in this section with the logic defined by the referenced p=
seudocode.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">I have suspected that the newly introduced logic should be par=
t of the Egress FEC Validation logic defined in Section 4.4.1 of RFC 8029.=
&nbsp; This suspicion has been acknowledged
 by the authors, and they plan to fix the wrong reference in the next revi=
sion of the draft.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">From my POV the best way to avoid possible misinterpretation b=
y the implementers would be inclusion of the updated version of the pseudo=
code (with explicit marking of the new
 logic) directly in the document. I have suggested this to the authors, bu=
t I did not get their response so far.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The problematic text has been replaced with pseudocode that integr=
ates the logic that has been defined in Section 4.4.1 of RFC 8029 with the=
 new, SR-specific pseudocode. So, in a way,
 the original issue has been resolved. However, I have several issues with=
 the current text:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">From my POV, the pseudocode could be made much more readable i=
f it were better structured. One possible way to do so could be defining h=
ow IGP extensions for SR can be treated
 as distributing if they distributed labels (including Implicit Null) for =
Node Segment IDs, and using the results in the original pseudocode of RFC =
8029<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">The proposed pseudocode seems to lack the check of Label-L mat=
ching the Node Segment ID in the SRGB of the responder<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">It is not obvious how the proposed pseudocode treats previousl=
y defined FECs in the target FEC stack<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">Interface-I (the ingress interface of the received LSP Ping re=
quest) is only mentioned in the check of Adjacency SID. It is also not cle=
ar to me why the check expects its match
 with the Remote Interface ID in the Adjacency SID TLV. <o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I did not raise these issues in my original review exactly because=
 it was impossible to integrate the new validation logic with the logic de=
fined in RFC 8029.
<b><i>Please consider these issues as my IESG LC comments</i></b>. <o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Major Issue #2 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I agree with the previous reviewer regarding the mismatch between =
the (presumed) claim and the actual scope covered by the draft. To the bes=
t of my understanding, the authors have already
 agreed to fix this in the next revision of the draft.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The title of the draft has been changed to reflect its actual scop=
e, and both the Abstract and Introduction clearly indicate that only IGP I=
P Prefix and Adjacency SIDs are covered by
 the draft. From my POV, this is sufficient, and <b><i>this issue is resol=
ved</i></b>.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Minor Issue #1 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I wonder why the authors place such an emphasis on Service labels =
(which, AFAIK, have not been defined in any level of detail anywhere so fa=
r) &#8211; these labels are mentioned in Sections
 4.2, 5 (that mentions them as &#8220;Service segments&#8221;)&nbsp; and 8=
, while so many types of Segment IDs that are already well defined both in=
 the SRPING WG documents and in the extensions of the relevant routing pro=
tocols are left out of scope of the draft.&nbsp; The authors
 have acknowledged this and plan to fix this issue (probably by removing t=
he Service labels completely).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">Service labels and service segments do not appear in the new versi=
on of the draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Minor Issue #2 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The description of possible data plane malfunctions in section 4.1=
 seems to assume that all the nodes in the referenced topology (shown in F=
igure 1) us the same SRGB. If this assumption
 (which is not explicitly mentioned) is not correct, the LSP Ping Echo req=
uest packets would not be &#8220;delivered to their expected destinations =
but not via the expected path&#8221; (as the text in this section claims).=
 I suggest making any such assumptions explicit
 in the text.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The new text of section 4.1 explicitly mentions the assumption abo=
ut same SRGB.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Minor Issue #3 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I am not sure if &#8220;OSPF&#8221; and ISIS&#8221; (without any r=
eference to Segment Routing) are the proper names for the label distributi=
on protocols in the proposed new IANA registry in Section 10.2.
 From my POV &#8220;OSPF/ISIS SR Extensions&#8221; would be more appropria=
te. The authors disagree with this proposal claiming that OSPF and ISIS ar=
e not used for label distribution=20in any other way. (RFC 8029 that encod=
es the label distribution protocol in the Downstream&nbsp;
 Detailed Mapping TLV did not request a dedicated registry for this purpos=
e, and I think that the authors have been right to request such a registry=
).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The new version uses the same protocol names as the previous one. =
Meanwhile, I have found that OSPF and IS-IS can be used for distriburing l=
abel ranges for BIER (see
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-bier-ospf-bier-exte=
nsions/?include_text=3D1">
OSPF Extensions for BIER</a> and a similar draft for ISIS). From my POV, <=
b><i>this supports my recommendation to change the names of protocols to d=
ifferentiate between multiple extensions to OSPF and IS-IS that distribute=
 label ranges</i></b>.
<b><i>Please consider this as my IESG LC WG comment.<o:p></o:p></i></b></s=
pan></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D"><o:p><span styl=
e=3D"text-decoration:none">&nbsp;</span></o:p></span></u></b></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Minor Issue #4 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I doubt the draft needs address any FRR issues even in future (as =
mentioned in the last statement in Section 5), since, to the best of my un=
derstanding, any form of FRR:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">Is operated locally by the node that is upstream to the failur=
e without passing any information to the initiator of LSP-Ping Request pac=
kets<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:54.0pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">In any case is just a transient state in the (presumably short=
) interval between the failure being detected by the upstream node and re-=
convergence of IGP<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">I also think that references to &#8220;future versions&#8221; are =
not quite appropriate in the document that is going to the IETF LC. I reco=
mmend removing any such references from the document.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">All mention of FRR has been removed from the new version, as well =
as any references to future versions.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Minor Issue #5 =
in the -06 version of the draft</span></u></b><span style=3D"color:#1F497D=
">:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">Section 9 &#8220;Backward Compatibility with non-Segment Routing d=
evices&#8221; defines the behavior for the two slightly different use case=
s:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; LSP Ping Echo Request packets are initiated by an SR-capable=
 node (and therefore their target FEC stack contains SR-related FECs), whi=
le the responder is legacy device
 that is not SR-capable. In this case the proposed solution (respond with =
the FEC-return-code &#8220;Replying router has no mapping for the FEC at s=
tack-depth&#8221;) looks as the only possibility since the legacy device c=
annot parse SR FECs in any case<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; LSP Ping Echo Request packets are initiated by a legacy devi=
ce while the responder is SR-capable. The draft defines the same behavior =
in this case &#8211; but, IMHO and FWIW,
 the responder could provide slightly better diagnostics since it can pars=
e the &#8220;old&#8221; target FEC and recognize the equivalent Node ID. A=
n additional return code would be required to implement this behavior.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">This issue has not been discussed with the authors due to lack of =
time.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><u><span style=3D"color:#1F497D">Status in the -=
11 version of the draft</span></u></b><span style=3D"color:#1F497D">:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D">The authors have responded that a legacy (LDP-only) initiator of L=
SP Pings request messages in any case would not be able to parse a new ret=
urn code.
<b><i>I agree with this comment, and withdraw the issue</i></b>.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#=
1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">All the nits I&#8217;=
ve noticed also have been resolved. In particular, early IANA allocations =
that have expired on 15.09.17, have been extended to one more year.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
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Subject: [RTG-DIR] RtgDir review: draft-ietf-grow-bgp-gshut-11.txt
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From: <bruno.decraene@orange.com>
To: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>
CC: "grow@ietf.org" <grow@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-grow-bgp-gshut.all@ietf.org" <draft-ietf-grow-bgp-gshut.all@ietf.org>, "rtg-ads@ietf.org" <rtg-ads@ietf.org>
Thread-Topic: RtgDir review: draft-ietf-grow-bgp-gshut-11.txt
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Date: Wed, 4 Oct 2017 11:33:26 +0000
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Subject: Re: [RTG-DIR] RtgDir review: draft-ietf-grow-bgp-gshut-11.txt
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Subject: [RTG-DIR] RtgDir Review: draft-ietf-opsawg-service-model-explained
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From nobody Fri Oct  6 06:25:45 2017
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To: NetMod WG <netmod@ietf.org>
Cc: rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
From: Lou Berger <lberger@labn.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/FU4zJ9ssNneGypU0fAoX3CQo8OY>
Subject: [RTG-DIR] handling module incompatibility
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Hi,

    As part of the my Routing Directorate review of
draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
changes being made to the ietf-l3vpn-svc module without changing the
name.  I raised this with the YANG doctors and others involved with the
draft and it surfaced some topics which really should be discussed here
in NetMod.

The background (as explained off-list by others, so I hope I have it
right)  is that one of the YANG Doctors noted that RFC8049 was broken
and could not be implemented as defined, and therefore a fix was
needed.  L3SM has concluded so the fix is in the individual draft
draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
module could not be implemented, the feeling by the YANG Dr was that
even though the new module is incompatible with the original definition
the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
RFC 6020) didn't have to be followed and the same name could be used.

In the subsequent discussion with the YANG Drs., the general discussion
was heading down the path of using a new module name, and thereby not
violating YANG module update rules.  This lead us back to the a similar
discussion we've been having in the context of 8022bis: how best to
indicate that a whole module is being obsoleted.  RFCs do this by adding
'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
help YANG tooling.  For 8022, we have one approach - publishing an
updated rev of the original module marking all nodes as deprecated - but
that doesn't really make sense for rfc8049bis.

So the discussion for the WG is:

How do we handle incompatible module changes, notably when one module
'obsoletes' another module --  from both the process and tooling
perspectives?

I know Benoit plans to bring in some thoughts/proposals, perhaps there
are others.

Cheers,

Lou

(as contributor/reviewer)



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To: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>
Cc: rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
References: <caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net>
From: Robert Wilton <rwilton@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/-8bazNri2L2IzfqHfT14gNv2_XU>
Subject: Re: [RTG-DIR] [netmod] handling module incompatibility
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Hi,

On 06/10/2017 14:25, Lou Berger wrote:
> Hi,
>
>      As part of the my Routing Directorate review of
> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
> changes being made to the ietf-l3vpn-svc module without changing the
> name.  I raised this with the YANG doctors and others involved with the
> draft and it surfaced some topics which really should be discussed here
> in NetMod.
>
> The background (as explained off-list by others, so I hope I have it
> right)  is that one of the YANG Doctors noted that RFC8049 was broken
> and could not be implemented as defined, and therefore a fix was
> needed.  L3SM has concluded so the fix is in the individual draft
> draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
> module could not be implemented, the feeling by the YANG Dr was that
> even though the new module is incompatible with the original definition
> the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
> RFC 6020) didn't have to be followed and the same name could be used.

I think that this is the view that I support as well.  If something is 
clearly broken then it should be possible to fix it without requiring a 
new module name, just an updated revision.

Once the modules are properly stable, have multiple implementations, 
then I fully support the 7950 update guidelines, but I think that they 
are a bit strict as IETF is developing brand new modules, particularly 
those that don't necessarily have implementations behind them at the 
point that they reach RFC.

Thanks,
Rob


>
> In the subsequent discussion with the YANG Drs., the general discussion
> was heading down the path of using a new module name, and thereby not
> violating YANG module update rules.  This lead us back to the a similar
> discussion we've been having in the context of 8022bis: how best to
> indicate that a whole module is being obsoleted.  RFCs do this by adding
> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
> help YANG tooling.  For 8022, we have one approach - publishing an
> updated rev of the original module marking all nodes as deprecated - but
> that doesn't really make sense for rfc8049bis.
>
> So the discussion for the WG is:
>
> How do we handle incompatible module changes, notably when one module
> 'obsoletes' another module --  from both the process and tooling
> perspectives?
>
> I know Benoit plans to bring in some thoughts/proposals, perhaps there
> are others.
>
> Cheers,
>
> Lou
>
> (as contributor/reviewer)
>
>
> _______________________________________________
> netmod mailing list
> netmod@ietf.org
> https://www.ietf.org/mailman/listinfo/netmod


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From: Kent Watsen <kwatsen@juniper.net>
To: Robert Wilton <rwilton@cisco.com>, Lou Berger <lberger@labn.net>, "NetMod WG" <netmod@ietf.org>
CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-wu-l3sm-rfc8049bis.all@ietf.org" <draft-wu-l3sm-rfc8049bis.all@ietf.org>
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Subject: Re: [RTG-DIR] [netmod] handling module incompatibility
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Subject: [RTG-DIR] RtgDir review: draft-ietf-sunset4-ipv6-ietf-01
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/hc7qgrbW22CoDbV8gJLi8vN3TM0>
Subject: Re: [RTG-DIR] [netmod] handling module incompatibility
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----- Original Message -----
From: "Lou Berger" <lberger@labn.net>
Sent: Friday, October 06, 2017 2:25 PM

> As part of the my Routing Directorate review of
> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
> changes being made to the ietf-l3vpn-svc module without changing the
> name. I raised this with the YANG doctors and others involved with the
> draft and it surfaced some topics which really should be discussed
here
> in NetMod.
>
> The background (as explained off-list by others, so I hope I have it
> right) is that one of the YANG Doctors noted that RFC8049 was broken
> and could not be implemented as defined, and therefore a fix was
> needed. L3SM has concluded so the fix is in the individual draft
> draft-wu-l3sm-rfc8049bis. Since the rfc8049 version of ietf-l3vpn-svc
> module could not be implemented, the feeling by the YANG Dr was that
> even though the new module is incompatible with the original
definition
> the module the rule defined in Section 11 of YANG 1.1 (or section 10
of
> RFC 6020) didn't have to be followed and the same name could be used.
>
> In the subsequent discussion with the YANG Drs., the general
discussion
> was heading down the path of using a new module name, and thereby not
> violating YANG module update rules. This lead us back to the a similar
> discussion we've been having in the context of 8022bis: how best to
> indicate that a whole module is being obsoleted. RFCs do this by
adding
> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
> help YANG tooling. For 8022, we have one approach - publishing an
> updated rev of the original module marking all nodes as deprecated -
but
> that doesn't really make sense for rfc8049bis.
>
> So the discussion for the WG is:
>
> How do we handle incompatible module changes, notably when one module
> 'obsoletes' another module -- from both the process and tooling
> perspectives?

Add a new substatement to the module statement, 'obsoletes' or
'supersedes'or such like..

And I mean write the RFC now, do not wait for a future version or
revision of RFC7950.

Tom Petch

> I know Benoit plans to bring in some thoughts/proposals, perhaps there
> are others.
>
> Cheers,
>
> Lou
>
> (as contributor/reviewer)
>
>


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Date: Fri, 6 Oct 2017 18:53:42 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Robert Wilton <rwilton@cisco.com>
Cc: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>, rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
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Mail-Followup-To: Robert Wilton <rwilton@cisco.com>, Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>, rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
References: <caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net> <ab4704c2-17b7-f789-535a-9aa88aa92e9c@cisco.com>
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Subject: Re: [RTG-DIR] [netmod] handling module incompatibility
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On Fri, Oct 06, 2017 at 03:49:50PM +0100, Robert Wilton wrote:
> Hi,
> 
> On 06/10/2017 14:25, Lou Berger wrote:
> > Hi,
> > 
> >   As part of the my Routing Directorate review of
> > draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
> > changes being made to the ietf-l3vpn-svc module without changing the
> > name. I raised this with the YANG doctors and others involved with the
> > draft and it surfaced some topics which really should be discussed here
> > in NetMod.
> > 
> > The background (as explained off-list by others, so I hope I have it
> > right) is that one of the YANG Doctors noted that RFC8049 was broken
> > and could not be implemented as defined, and therefore a fix was
> > needed. L3SM has concluded so the fix is in the individual draft
> > draft-wu-l3sm-rfc8049bis. Since the rfc8049 version of ietf-l3vpn-svc
> > module could not be implemented, the feeling by the YANG Dr was that
> > even though the new module is incompatible with the original definition
> > the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
> > RFC 6020) didn't have to be followed and the same name could be used.
> 
> I think that this is the view that I support as well. If something is
> clearly broken then it should be possible to fix it without requiring a new
> module name, just an updated revision.
>

The hidden question is what is 'broken' or 'clearly broken' and when
are definitions in a module broken and when is the damage so big that
the whole module is broken. Does a broken xpath statement cause the
whole module to be fundamentally flawed such that an implementation of
the rest is impossible?

It is not uncommon to find errors in data models and it is then often
a matter of a new revision or errata to address those. The question
here is when is an entire module broken up to the point that nobody
ever will have implemented it or parts of it.

I do not know the answer but I see a certain risk that minor bugs will
be used to argue none of the YANG update rules apply.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>


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To: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>
Cc: rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org, draft-acee-netmod-rfc8022bis@ietf.org
References: <caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net>
From: Benoit Claise <bclaise@cisco.com>
Message-ID: <751fa015-a917-a104-f6c6-25cc9a5accba@cisco.com>
Date: Sun, 8 Oct 2017 16:58:32 +0200
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Subject: Re: [RTG-DIR] handling module incompatibility => handling module transition
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Dear all,

Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049 is 
broken. The small problem is: trying to maintain backward compatibility.
draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.

Let me extend the scope of this email thread from "handling module 
incompatibility" to "handling module incompatibility and NMDA transition".
As I mentioned in the past (see "semver.org comparison of two YANG 
modules" email in NETMOD), I believe the IETF will have to change its 
way of working in terms of backward compatibility. See also the email 
"ietf-routing or ietf-routing-2? module naming convention for NMDA 
transition. Re: [netmod] upcoming adoptions" in NETMOD.

However, we will have to tackle this discussion one day or the other:
- we need _an automatic way_ to make the link between the YANG module in 
RFC8049 and the YANG module in draft-wu-l3sm-rfc8049bis, or any non 
backward compatible YANG modules.
- we need _an automatic way_ to make the link between the YANG module in 
RFC8022 and the YANG module in draft-acee-netmod-rfc8022bis, or any new 
YANG module names used for NMDA transition.
Note: actually, we face two different problems. draft-wu-l3sm-rfc8049bis 
might be declared backward incompatible with RFC8049, while RFC8022bis 
is backward compatible with RFC8022. The RFC8022bis went for a new YANG 
module name ietf-routing-2 to avoid to document the -state tree (as 
deprecated), based on the argument that ietf-routing is not yet implemented.

Which solutions do we have from here?
#1. We keep the same module name and express that the YANG module in 
draft-wu-l3sm-rfc8049bis is not backward compatible with the RFC8049 
one. This is the openconfig way. See draft-clacla-netmod-model-catalog 
(and draft-openconfig-netmod-model-catalog before)

       // extension statements
          extension openconfig-version {
            argument "semver" {
              yin-element false;
            }
            description
              "The OpenConfig version number for the module. This is
              expressed as a semantic version number of the form:
                x.y.z
               where:
                * x corresponds to the major version,
                * y corresponds to a minor version,
                * z corresponds to a patch version.
              This version corresponds to the model file within which it is
              defined, and does not cover the whole set of OpenConfig models.
              Where several modules are used to build up a single block of
              functionality, the same module version is specified across each
              file that makes up the module.

              A major version number of 0 indicates that this model is still
              in development (whether within OpenConfig or with industry
              partners), and is potentially subject to change.

              Following a release of major version 1, all modules will
              increment major revision number where backwards incompatible
              changes to the model are made.

              The minor version is changed when features are added to the
              model that do not impact current clients use of the model.

              The patch-level version is incremented when non-feature changes
              (such as bugfixes or clarifications to human-readable
              descriptions that do not impact model functionality) are made
              that maintain backwards compatibility.

              The version number is stored in the module meta-data.";
          }

Similarly, we always keep the same YANG module name in case of NMDA 
transition. So ietf-routing-2 should be changed back to ietf-routing.
The email thread "[Rtg-dt-yang-arch] ietf-routing or ietf-routing-2? 
module naming convention for NMDA transition. Re: [netmod] upcoming 
adoptions" seems to go in that direction.

#2. Or we have a different module name, let's say ietf-l3vpn-svc-2 or 
ietf-routing-2 but then, how do we make the link with the previous module?
Then ...  What? We create extension that will link the 
draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module? Same 
principle as #1, but just more complex.
Or we have a new YANG keyword (this implies YANG 2.0)

    <CODE BEGINS>file"ietf-l3vpn-svc@2017-09-14.yang"
    module ietf-l3vpn-svc-2 {
      yang-version 1.1;
      namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
      prefix l3vpn-svc;
      *_obsolete|update _*ietf-l3vpn-svc@2017-01-2

And whose responsibility is this to warn/push all authors of 
ietf-routing YANG modules to move to ietf-routing-2? (*)

The following are non solution IMO:
- Going from the draft-wu-l3sm-rfc8049bis YANG _module _to the 
draft-wu-l3sm-rfc8049bis _document _to lookup the IETF "obsolete" flag 
in order to understand that the RFC8049 YANG module is obsolete is not 
an automatic solution.
- Using the yangcatalog.org might be a solution as we track the derived 
semantic, but this is just an offline trick. This is not what I call 
"automatic way"
- Using the YANG module description field might be interesting, but 
again this is not an "automatic way":

      description
       "This YANG module defines a generic service configuration
        model for Layer 3 VPNs. This model is common across all
        vendor implementations. This obsoletes the RFC8049 YANG
        module, ietf-l3vpn-svc@2017-01-2";
      revision 2017-09-14 {
       description
        "First revision ofRFC8049 <https://tools.ietf.org/html/rfc8049>.";
       reference
        "RFC xxxx: YANG Data Model for L3VPN Service Delivery";


In conclusion, I believe openconfig got this right and that solution #1 
is the solution to go ... while waiting for a new YANG keyword in YANG 2.0

(*) If you want to change the module from ietf-routing to 
ietf-routing-2, then you should follow with all authors of dependent 
modules to make sure they transition to ietf-routing-2
In the yangcatalog.org, because I needed the information as OPS AD, we 
created a small script to get that authors list for IETF drafts. For the 
ietf-routing, this produces the following
{
     "output": {
         "author-email": [
"draft-ietf-mpls-static-yang@ietf.org",
"draft-ietf-mpls-base-yang@ietf.org",
"draft-ietf-ospf-sr-yang@ietf.org",
"draft-ietf-pim-yang@ietf.org",
"draft-ietf-bier-bier-yang@ietf.org",
"draft-zhang-bier-te-yang@ietf.org",
"draft-ietf-isis-yang-isis-cfg@ietf.org",
"draft-ietf-teas-yang-rsvp-te@ietf.org",
"draft-ietf-mpls-mldp-yang@ietf.org",
"draft-zhao-pim-igmp-mld-snooping-yang@ietf.org",
"draft-ietf-isis-sr-yang@ietf.org",
"draft-acee-rtgwg-yang-rib-extend@ietf.org",
"draft-ietf-pim-igmp-mld-yang@ietf.org",
"draft-ietf-i2rs-fb-rib-data-model@ietf.org",
"draft-ietf-ospf-yang@ietf.org",
"draft-ietf-rtgwg-yang-rip@ietf.org",
"draft-ietf-spring-sr-yang@ietf.org",
"draft-ietf-teas-yang-rsvp@ietf.org",
"draft-ietf-i2rs-pkt-eca-data-model@ietf.org",
"draft-ietf-mpls-ldp-yang@ietf.org",
"draft-ietf-bfd-yang@ietf.org",
"draft-ietf-pim-msdp-yang@ietf.org"
         ]
     }
}

Fortunately, we only deal with IETF dependent YANG modules in case of 
the ietf-routing. That's an easier case.
If we would change ietf-interfaces to ietf-interfaces-2, we would have 
an cross SDO issue ... Btw, there are no automatic ways to extract the 
authors of YANG modules from different SDOs: it's only a metadata that 
that the different SDOs should insert in the yangcatalog. So we would 
have to rely on liaisons or direct emails, assuming we know the authors. 
Time consuming, believe me.

Regards, Benoit
> Hi,
>
>      As part of the my Routing Directorate review of
> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
> changes being made to the ietf-l3vpn-svc module without changing the
> name.  I raised this with the YANG doctors and others involved with the
> draft and it surfaced some topics which really should be discussed here
> in NetMod.
>
> The background (as explained off-list by others, so I hope I have it
> right)  is that one of the YANG Doctors noted that RFC8049 was broken
> and could not be implemented as defined, and therefore a fix was
> needed.  L3SM has concluded so the fix is in the individual draft
> draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
> module could not be implemented, the feeling by the YANG Dr was that
> even though the new module is incompatible with the original definition
> the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
> RFC 6020) didn't have to be followed and the same name could be used.
>
> In the subsequent discussion with the YANG Drs., the general discussion
> was heading down the path of using a new module name, and thereby not
> violating YANG module update rules.  This lead us back to the a similar
> discussion we've been having in the context of 8022bis: how best to
> indicate that a whole module is being obsoleted.  RFCs do this by adding
> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
> help YANG tooling.  For 8022, we have one approach - publishing an
> updated rev of the original module marking all nodes as deprecated - but
> that doesn't really make sense for rfc8049bis.
>
> So the discussion for the WG is:
>
> How do we handle incompatible module changes, notably when one module
> 'obsoletes' another module --  from both the process and tooling
> perspectives?
>
> I know Benoit plans to bring in some thoughts/proposals, perhaps there
> are others.
>
> Cheers,
>
> Lou
>
> (as contributor/reviewer)
>
>
> .
>


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    <div class="moz-cite-prefix">Dear all,<br>
      <br>
      Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049
      is broken. The small problem is: trying to maintain backward
      compatibility.<br>
      draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.<br>
      <br>
      Let me extend the scope of this email thread from "handling module
      incompatibility" to "handling module incompatibility and NMDA
      transition".<br>
      As I mentioned in the past (see "semver.org comparison of two YANG
      modules" email in NETMOD), I believe the IETF will have to change
      its way of working in terms of backward compatibility. See also
      the email "ietf-routing or ietf-routing-2? module naming
      convention for NMDA transition. Re: [netmod] upcoming adoptions"
      in NETMOD. <br>
      <br>
      However, we will have to tackle this discussion one day or the
      other: <br>
      - we need <u>an automatic way</u> to make the link between the
      YANG module in RFC8049 and the YANG module in
      draft-wu-l3sm-rfc8049bis, or any non backward compatible YANG
      modules.<br>
      - we need <u>an automatic way</u> to make the link between the
      YANG module in RFC8022 and the YANG module in
      draft-acee-netmod-rfc8022bis, or any new YANG module names used
      for NMDA transition.<br>
      Note: actually, we face two different problems.
      draft-wu-l3sm-rfc8049bis might be declared backward incompatible
      with RFC8049, while RFC8022bis is backward compatible with
      RFC8022. The RFC8022bis went for a new YANG module name
      ietf-routing-2 to avoid to document the -state tree (as
      deprecated), based on the argument that ietf-routing is not yet
      implemented.<br>
      <br>
      Which solutions do we have from here? <br>
      #1. We keep the same module name and express that the YANG module
      in draft-wu-l3sm-rfc8049bis is not backward compatible with the
      RFC8049 one. This is the openconfig way. See
      draft-clacla-netmod-model-catalog (and
      draft-openconfig-netmod-model-catalog before)<small><br>
      </small>
      <blockquote>
        <pre>  // extension statements
     extension openconfig-version {
       argument "semver" {
         yin-element false;
       }
       description
         "The OpenConfig version number for the module. This is
         expressed as a semantic version number of the form:
           x.y.z
          where:
           * x corresponds to the major version,
           * y corresponds to a minor version,
           * z corresponds to a patch version.
         This version corresponds to the model file within which it is
         defined, and does not cover the whole set of OpenConfig models.
         Where several modules are used to build up a single block of
         functionality, the same module version is specified across each
         file that makes up the module.

         A major version number of 0 indicates that this model is still
         in development (whether within OpenConfig or with industry
         partners), and is potentially subject to change.

         Following a release of major version 1, all modules will
         increment major revision number where backwards incompatible
         changes to the model are made.

         The minor version is changed when features are added to the
         model that do not impact current clients use of the model.

         The patch-level version is incremented when non-feature changes
         (such as bugfixes or clarifications to human-readable
         descriptions that do not impact model functionality) are made
         that maintain backwards compatibility.

         The version number is stored in the module meta-data.";
     }</pre>
      </blockquote>
      Similarly, we always keep the same YANG module name in case of
      NMDA transition. So ietf-routing-2 should be changed back to
      ietf-routing.<br>
      The email thread "[Rtg-dt-yang-arch] ietf-routing or
      ietf-routing-2? module naming convention for NMDA transition. Re:
      [netmod] upcoming adoptions" seems to go in that direction.<br>
      <br>
      #2. Or we have a different module name, let's say ietf-l3vpn-svc-2
      or ietf-routing-2 but then, how do we make the link with the
      previous module? <br>
      Then ...  What? We create extension that will link the
      draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module?
      Same principle as #1, but just more complex. <br>
      Or we have a new YANG keyword (this implies YANG 2.0)<br>
      <blockquote>
        <pre class="newpage">&lt;CODE BEGINS&gt;file <a class="moz-txt-link-rfc2396E" href="mailto:ietf-l3vpn-svc@2017-09-14.yang">"ietf-l3vpn-svc@2017-09-14.yang"</a>
module ietf-l3vpn-svc-2 {
 yang-version 1.1;
 namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
 prefix l3vpn-svc;
 <b><u>obsolete|update </u></b>ietf-l3vpn-svc@2017-01-2
</pre>
      </blockquote>
      And whose responsibility is this to warn/push all authors of
      ietf-routing YANG modules to move to ietf-routing-2? (*)<br>
      <br>
      The following are non solution IMO:<br>
      - Going from the draft-wu-l3sm-rfc8049bis YANG <u>module </u>to
      the draft-wu-l3sm-rfc8049bis <u>document </u>to lookup the IETF
      "obsolete" flag in order to understand that the RFC8049 YANG
      module is obsolete is not an automatic solution.<br>
      - Using the yangcatalog.org might be a solution as we track the
      derived semantic, but this is just an offline trick. This is not
      what I call "automatic way"<br>
      - Using the YANG module description field might be interesting,
      but again this is not an "automatic way":<br>
      <blockquote>
        <pre class="newpage"> description
  "This YANG module defines a generic service configuration
   model for Layer 3 VPNs. This model is common across all
   vendor implementations. This obsoletes the RFC8049 YANG 
   module, ietf-l3vpn-svc@2017-01-2";
 revision 2017-09-14 {
  description
   "First revision of <a href="https://tools.ietf.org/html/rfc8049">RFC8049</a>.";
  reference
   "RFC xxxx: YANG Data Model for L3VPN Service Delivery";</pre>
      </blockquote>
      <br>
      In conclusion, I believe openconfig got this right and that
      solution #1 is the solution to go ... while waiting for a new YANG
      keyword in YANG 2.0<br>
      <br>
      (*) If you want to change the module from ietf-routing to
      ietf-routing-2, then you should follow with all authors of
      dependent modules to make sure they transition to ietf-routing-2<br>
      In the yangcatalog.org, because I needed the information as OPS
      AD, we created a small script to get that authors list for IETF
      drafts. For the ietf-routing, this produces the following<br>
      {<br>
          "output": {<br>
              "author-email": [<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-mpls-static-yang@ietf.org">"draft-ietf-mpls-static-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-mpls-base-yang@ietf.org">"draft-ietf-mpls-base-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-ospf-sr-yang@ietf.org">"draft-ietf-ospf-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-pim-yang@ietf.org">"draft-ietf-pim-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-bier-bier-yang@ietf.org">"draft-ietf-bier-bier-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-zhang-bier-te-yang@ietf.org">"draft-zhang-bier-te-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-isis-yang-isis-cfg@ietf.org">"draft-ietf-isis-yang-isis-cfg@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-teas-yang-rsvp-te@ietf.org">"draft-ietf-teas-yang-rsvp-te@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-mpls-mldp-yang@ietf.org">"draft-ietf-mpls-mldp-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-zhao-pim-igmp-mld-snooping-yang@ietf.org">"draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-isis-sr-yang@ietf.org">"draft-ietf-isis-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-acee-rtgwg-yang-rib-extend@ietf.org">"draft-acee-rtgwg-yang-rib-extend@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-pim-igmp-mld-yang@ietf.org">"draft-ietf-pim-igmp-mld-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-i2rs-fb-rib-data-model@ietf.org">"draft-ietf-i2rs-fb-rib-data-model@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-ospf-yang@ietf.org">"draft-ietf-ospf-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-rtgwg-yang-rip@ietf.org">"draft-ietf-rtgwg-yang-rip@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-spring-sr-yang@ietf.org">"draft-ietf-spring-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-teas-yang-rsvp@ietf.org">"draft-ietf-teas-yang-rsvp@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-i2rs-pkt-eca-data-model@ietf.org">"draft-ietf-i2rs-pkt-eca-data-model@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-mpls-ldp-yang@ietf.org">"draft-ietf-mpls-ldp-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-bfd-yang@ietf.org">"draft-ietf-bfd-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
        href="mailto:draft-ietf-pim-msdp-yang@ietf.org">"draft-ietf-pim-msdp-yang@ietf.org"</a><br>
              ]<br>
          }<br>
      }<br>
      <br>
      Fortunately, we only deal with IETF dependent YANG modules in case
      of the ietf-routing. That's an easier case.<br>
      If we would change ietf-interfaces to ietf-interfaces-2, we would
      have an cross SDO issue ... Btw, there are no automatic ways to
      extract the authors of YANG modules from different SDOs: it's only
      a metadata that that the different SDOs should insert in the
      yangcatalog. So we would have to rely on liaisons or direct
      emails, assuming we know the authors. Time consuming, believe me.<br>
      <br>
      Regards, Benoit<br>
    </div>
    <blockquote type="cite"
      cite="mid:caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net">
      <pre wrap="">Hi,

    As part of the my Routing Directorate review of
draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
changes being made to the ietf-l3vpn-svc module without changing the
name.  I raised this with the YANG doctors and others involved with the
draft and it surfaced some topics which really should be discussed here
in NetMod.

The background (as explained off-list by others, so I hope I have it
right)  is that one of the YANG Doctors noted that RFC8049 was broken
and could not be implemented as defined, and therefore a fix was
needed.  L3SM has concluded so the fix is in the individual draft
draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
module could not be implemented, the feeling by the YANG Dr was that
even though the new module is incompatible with the original definition
the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
RFC 6020) didn't have to be followed and the same name could be used.

In the subsequent discussion with the YANG Drs., the general discussion
was heading down the path of using a new module name, and thereby not
violating YANG module update rules.  This lead us back to the a similar
discussion we've been having in the context of 8022bis: how best to
indicate that a whole module is being obsoleted.  RFCs do this by adding
'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
help YANG tooling.  For 8022, we have one approach - publishing an
updated rev of the original module marking all nodes as deprecated - but
that doesn't really make sense for rfc8049bis.

So the discussion for the WG is:

How do we handle incompatible module changes, notably when one module
'obsoletes' another module --  from both the process and tooling
perspectives?

I know Benoit plans to bring in some thoughts/proposals, perhaps there
are others.

Cheers,

Lou

(as contributor/reviewer)


.

</pre>
    </blockquote>
    <br>
  </body>
</html>

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--_000_34333AE3B0F143C3A9DE2BB3AAD7E7BAciscocom_--


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Date: Mon, 09 Oct 2017 16:05:41 -0400
From: Alvaro Retana <aretana.ietf@gmail.com>
To: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "routing-discussion@ietf.org" <routing-discussion@ietf.org>, "rtg-chairs@ietf.org" <rtg-chairs@ietf.org>
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Thread-Topic: Change of Affiliation (Alvaro Retana)
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Subject: Re: [RTG-DIR] Change of Affiliation (Alvaro Retana)
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--B_3590409941_1129720480
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Just FYI=E2=80=A6

=20

I am now affiliated with Huawei.=C2=A0 My new e-mail address is alvaro.retana@h=
uawei.com.

=20

I=E2=80=99ll keep using my personal address (aretana.ietf@gmail.com) for now=E2=80=A6

=20

Alvaro.

=20

=20

=20

From: "Alvaro Retana (aretana)" <aretana@cisco.com>
Date: Monday, October 2, 2017 at 9:17 AM
To: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "routing-discussion@ietf.org" <r=
outing-discussion@ietf.org>, "rtg-chairs@ietf.org" <rtg-chairs@ietf.org>
Cc: "aretana.ietf@yahoo.com" <aretana.ietf@yahoo.com>
Subject: Change of Affiliation (Alvaro Retana)

=20

Hi!

=20

Starting today I am no longer affiliated with Cisco.

=20

I will continue with my duties as AD, and plan to be in Singapore.  I don=E2=80=
=99t anticipate any changes related to WG assignments.

=20

I will announce a new affiliation as soon as I have a new e-mail address.  =
For now, you can reach me at aretana.ietf@yahoo.com.

=20

Thanks!

=20

Alvaro.

=20


--B_3590409941_1129720480
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ontent=3D""><meta name=3DKeywords content=3D""><meta http-equiv=3DContent-Type conte=
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--></style></head><body bgcolor=3Dwhite lang=3DEN-US link=3D"#0563C1" vlink=3D"#954=
F72"><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'font-size:11.0p=
t'>Just FYI=E2=80=A6<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-siz=
e:11.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-s=
ize:11.0pt'>I am now affiliated with Huawei.=C2=A0 My new e-mail address is <a h=
ref=3D"mailto:alvaro.retana@huawei.com">alvaro.retana@huawei.com</a>.<o:p></o:=
p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>I=E2=80=99ll keep=
 using my personal address (<a href=3D"mailto:aretana.ietf@gmail.com)">aretana=
.ietf@gmail.com)</a> for now=E2=80=A6<o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><s=
pan style=3D'font-size:11.0pt'>Alvaro.<o:p></o:p></span></p><p class=3DMsoNormal=
><span style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNorm=
al><span style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div style=3D'=
border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p cla=
ss=3DMsoNormal><b><span style=3D'color:black'>From: </span></b><span style=3D'colo=
r:black'>&quot;Alvaro Retana (aretana)&quot; &lt;aretana@cisco.com&gt;<br><b=
>Date: </b>Monday, October 2, 2017 at 9:17 AM<br><b>To: </b>&quot;rtg-dir@ie=
tf.org&quot; &lt;rtg-dir@ietf.org&gt;, &quot;routing-discussion@ietf.org&quo=
t; &lt;routing-discussion@ietf.org&gt;, &quot;rtg-chairs@ietf.org&quot; &lt;=
rtg-chairs@ietf.org&gt;<br><b>Cc: </b>&quot;aretana.ietf@yahoo.com&quot; &lt=
;aretana.ietf@yahoo.com&gt;<br><b>Subject: </b>Change of Affiliation (Alvaro=
 Retana)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'fon=
t-size:11.0pt'><o:p>&nbsp;</o:p></span></p></div><p class=3DMsoNormal><span st=
yle=3D'font-size:11.0pt'>Hi!</span><o:p></o:p></p><p class=3DMsoNormal><span sty=
le=3D'font-size:11.0pt'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal><span s=
tyle=3D'font-size:11.0pt'>Starting today I am no longer affiliated with Cisco.=
</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>&nbs=
p;</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>I =
will continue with my duties as AD, and plan to be in Singapore.&nbsp; I don=
=E2=80=99t anticipate any changes related to WG assignments.</span><o:p></o:p></p>=
<p class=3DMsoNormal><span style=3D'font-size:11.0pt'>&nbsp;</span><o:p></o:p></=
p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>I will announce a new af=
filiation as soon as I have a new e-mail address.&nbsp; For now, you can rea=
ch me at <a href=3D"mailto:aretana.ietf@yahoo.com">aretana.ietf@yahoo.com</a>.=
</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>&nbs=
p;</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'>Th=
anks!</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'=
>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11.0p=
t'>Alvaro.</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:11=
.0pt'>&nbsp;</span><o:p></o:p></p></div></body></html>

--B_3590409941_1129720480--



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From: Lou Berger <lberger@labn.net>
To: Benoit Claise <bclaise@cisco.com>, NetMod WG <netmod@ietf.org>
CC: <rtg-dir@ietf.org>, <draft-acee-netmod-rfc8022bis@ietf.org>, <draft-wu-l3sm-rfc8049bis.all@ietf.org>
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Subject: Re: [RTG-DIR] handling module incompatibility => handling module transition
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So circling back to the original question: what do we do about the non 
backward-compatible module being defined in rfc8049bis?

While being sympathetic to many of the comments made below as well as the 
"do over" concept, I find the comments about adhering to the rules of 7950 
compelling - which leads to renaming the module in the bis to ietf-l3vpn-svc-2.

It would be good to ensure that this is the consensus of the group before 
asking the authors make this change.

This change course doesn't solve the versioning issue discussed below, but 
this is not a new issue it's just the first time we'll actually executing 
the steps envisioned as part of the rules laid out in yang. My personal 
take away is that means that we should immediately start work on an 
extension defining along the lines of  ' obsolete|update' mentioned below.

Lou





On October 8, 2017 10:59:15 AM Benoit Claise <bclaise@cisco.com> wrote:

> Dear all,
>
> Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049 is
> broken. The small problem is: trying to maintain backward compatibility.
> draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.
>
> Let me extend the scope of this email thread from "handling module
> incompatibility" to "handling module incompatibility and NMDA transition".
> As I mentioned in the past (see "semver.org comparison of two YANG
> modules" email in NETMOD), I believe the IETF will have to change its
> way of working in terms of backward compatibility. See also the email
> "ietf-routing or ietf-routing-2? module naming convention for NMDA
> transition. Re: [netmod] upcoming adoptions" in NETMOD.
>
> However, we will have to tackle this discussion one day or the other:
> - we need _an automatic way_ to make the link between the YANG module in
> RFC8049 and the YANG module in draft-wu-l3sm-rfc8049bis, or any non
> backward compatible YANG modules.
> - we need _an automatic way_ to make the link between the YANG module in
> RFC8022 and the YANG module in draft-acee-netmod-rfc8022bis, or any new
> YANG module names used for NMDA transition.
> Note: actually, we face two different problems. draft-wu-l3sm-rfc8049bis
> might be declared backward incompatible with RFC8049, while RFC8022bis
> is backward compatible with RFC8022. The RFC8022bis went for a new YANG
> module name ietf-routing-2 to avoid to document the -state tree (as
> deprecated), based on the argument that ietf-routing is not yet implemented.
>
> Which solutions do we have from here?
> #1. We keep the same module name and express that the YANG module in
> draft-wu-l3sm-rfc8049bis is not backward compatible with the RFC8049
> one. This is the openconfig way. See draft-clacla-netmod-model-catalog
> (and draft-openconfig-netmod-model-catalog before)
>
>        // extension statements
>           extension openconfig-version {
>             argument "semver" {
>               yin-element false;
>             }
>             description
>               "The OpenConfig version number for the module. This is
>               expressed as a semantic version number of the form:
>                 x.y.z
>                where:
>                 * x corresponds to the major version,
>                 * y corresponds to a minor version,
>                 * z corresponds to a patch version.
>               This version corresponds to the model file within which it is
>               defined, and does not cover the whole set of OpenConfig models.
>               Where several modules are used to build up a single block of
>               functionality, the same module version is specified across each
>               file that makes up the module.
>
>               A major version number of 0 indicates that this model is still
>               in development (whether within OpenConfig or with industry
>               partners), and is potentially subject to change.
>
>               Following a release of major version 1, all modules will
>               increment major revision number where backwards incompatible
>               changes to the model are made.
>
>               The minor version is changed when features are added to the
>               model that do not impact current clients use of the model.
>
>               The patch-level version is incremented when non-feature changes
>               (such as bugfixes or clarifications to human-readable
>               descriptions that do not impact model functionality) are made
>               that maintain backwards compatibility.
>
>               The version number is stored in the module meta-data.";
>           }
>
> Similarly, we always keep the same YANG module name in case of NMDA
> transition. So ietf-routing-2 should be changed back to ietf-routing.
> The email thread "[Rtg-dt-yang-arch] ietf-routing or ietf-routing-2?
> module naming convention for NMDA transition. Re: [netmod] upcoming
> adoptions" seems to go in that direction.
>
> #2. Or we have a different module name, let's say ietf-l3vpn-svc-2 or
> ietf-routing-2 but then, how do we make the link with the previous module?
> Then ...  What? We create extension that will link the
> draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module? Same
> principle as #1, but just more complex.
> Or we have a new YANG keyword (this implies YANG 2.0)
>
>     <CODE BEGINS>file"ietf-l3vpn-svc@2017-09-14.yang"
>     module ietf-l3vpn-svc-2 {
>       yang-version 1.1;
>       namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
>       prefix l3vpn-svc;
>       *_obsolete|update _*ietf-l3vpn-svc@2017-01-2
>
> And whose responsibility is this to warn/push all authors of
> ietf-routing YANG modules to move to ietf-routing-2? (*)
>
> The following are non solution IMO:
> - Going from the draft-wu-l3sm-rfc8049bis YANG _module _to the
> draft-wu-l3sm-rfc8049bis _document _to lookup the IETF "obsolete" flag
> in order to understand that the RFC8049 YANG module is obsolete is not
> an automatic solution.
> - Using the yangcatalog.org might be a solution as we track the derived
> semantic, but this is just an offline trick. This is not what I call
> "automatic way"
> - Using the YANG module description field might be interesting, but
> again this is not an "automatic way":
>
>       description
>        "This YANG module defines a generic service configuration
>         model for Layer 3 VPNs. This model is common across all
>         vendor implementations. This obsoletes the RFC8049 YANG
>         module, ietf-l3vpn-svc@2017-01-2";
>       revision 2017-09-14 {
>        description
>         "First revision ofRFC8049 <https://tools.ietf.org/html/rfc8049>.";
>        reference
>         "RFC xxxx: YANG Data Model for L3VPN Service Delivery";
>
>
> In conclusion, I believe openconfig got this right and that solution #1
> is the solution to go ... while waiting for a new YANG keyword in YANG 2.0
>
> (*) If you want to change the module from ietf-routing to
> ietf-routing-2, then you should follow with all authors of dependent
> modules to make sure they transition to ietf-routing-2
> In the yangcatalog.org, because I needed the information as OPS AD, we
> created a small script to get that authors list for IETF drafts. For the
> ietf-routing, this produces the following
> {
>      "output": {
>          "author-email": [
> "draft-ietf-mpls-static-yang@ietf.org",
> "draft-ietf-mpls-base-yang@ietf.org",
> "draft-ietf-ospf-sr-yang@ietf.org",
> "draft-ietf-pim-yang@ietf.org",
> "draft-ietf-bier-bier-yang@ietf.org",
> "draft-zhang-bier-te-yang@ietf.org",
> "draft-ietf-isis-yang-isis-cfg@ietf.org",
> "draft-ietf-teas-yang-rsvp-te@ietf.org",
> "draft-ietf-mpls-mldp-yang@ietf.org",
> "draft-zhao-pim-igmp-mld-snooping-yang@ietf.org",
> "draft-ietf-isis-sr-yang@ietf.org",
> "draft-acee-rtgwg-yang-rib-extend@ietf.org",
> "draft-ietf-pim-igmp-mld-yang@ietf.org",
> "draft-ietf-i2rs-fb-rib-data-model@ietf.org",
> "draft-ietf-ospf-yang@ietf.org",
> "draft-ietf-rtgwg-yang-rip@ietf.org",
> "draft-ietf-spring-sr-yang@ietf.org",
> "draft-ietf-teas-yang-rsvp@ietf.org",
> "draft-ietf-i2rs-pkt-eca-data-model@ietf.org",
> "draft-ietf-mpls-ldp-yang@ietf.org",
> "draft-ietf-bfd-yang@ietf.org",
> "draft-ietf-pim-msdp-yang@ietf.org"
>          ]
>      }
> }
>
> Fortunately, we only deal with IETF dependent YANG modules in case of
> the ietf-routing. That's an easier case.
> If we would change ietf-interfaces to ietf-interfaces-2, we would have
> an cross SDO issue ... Btw, there are no automatic ways to extract the
> authors of YANG modules from different SDOs: it's only a metadata that
> that the different SDOs should insert in the yangcatalog. So we would
> have to rely on liaisons or direct emails, assuming we know the authors.
> Time consuming, believe me.
>
> Regards, Benoit
>> Hi,
>>
>>      As part of the my Routing Directorate review of
>> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
>> changes being made to the ietf-l3vpn-svc module without changing the
>> name.  I raised this with the YANG doctors and others involved with the
>> draft and it surfaced some topics which really should be discussed here
>> in NetMod.
>>
>> The background (as explained off-list by others, so I hope I have it
>> right)  is that one of the YANG Doctors noted that RFC8049 was broken
>> and could not be implemented as defined, and therefore a fix was
>> needed.  L3SM has concluded so the fix is in the individual draft
>> draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
>> module could not be implemented, the feeling by the YANG Dr was that
>> even though the new module is incompatible with the original definition
>> the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
>> RFC 6020) didn't have to be followed and the same name could be used.
>>
>> In the subsequent discussion with the YANG Drs., the general discussion
>> was heading down the path of using a new module name, and thereby not
>> violating YANG module update rules.  This lead us back to the a similar
>> discussion we've been having in the context of 8022bis: how best to
>> indicate that a whole module is being obsoleted.  RFCs do this by adding
>> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
>> help YANG tooling.  For 8022, we have one approach - publishing an
>> updated rev of the original module marking all nodes as deprecated - but
>> that doesn't really make sense for rfc8049bis.
>>
>> So the discussion for the WG is:
>>
>> How do we handle incompatible module changes, notably when one module
>> 'obsoletes' another module --  from both the process and tooling
>> perspectives?
>>
>> I know Benoit plans to bring in some thoughts/proposals, perhaps there
>> are others.
>>
>> Cheers,
>>
>> Lou
>>
>> (as contributor/reviewer)
>>
>>
>> .
>>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 8bit

<html>
<head>
      

</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">So circling back to the
original question: what do we do about the non backward-compatible module
being defined in rfc8049bis?</p>
<p style="margin: 0 0 1em 0; color: black;">While being sympathetic to many
of the comments made below as well as the "do over" concept, I find the
comments about adhering to the rules of 7950 compelling - which leads to
renaming the module in the bis to ietf-l3vpn-svc-2.</p>
<p style="margin: 0 0 1em 0; color: black;">It would be good to ensure that
this is the consensus of the group before asking the authors make this
change.</p>
<p style="margin: 0 0 1em 0; color: black;">This change course doesn't
solve the versioning issue discussed below, but this is not a new issue
it's just the first time we'll actually executing the steps envisioned as
part of the rules laid out in yang. My personal take away is that means
that we should immediately start work on an extension defining along the
lines of&nbsp; ' <b><u>obsolete|update</u></b>' mentioned below.</p>
<p style="margin: 0 0 1em 0; color: black;">Lou<br></p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt 0;">On
October 8, 2017 10:59:15 AM Benoit Claise &lt;bclaise@cisco.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
    <div class="moz-cite-prefix">Dear all,<br>
      <br>
      Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049
      is broken. The small problem is: trying to maintain backward
      compatibility.<br>
      draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.<br>
      <br>
      Let me extend the scope of this email thread from "handling module
      incompatibility" to "handling module incompatibility and NMDA
      transition".<br>
      As I mentioned in the past (see "semver.org comparison of two YANG
      modules" email in NETMOD), I believe the IETF will have to change
      its way of working in terms of backward compatibility. See also
      the email "ietf-routing or ietf-routing-2? module naming
      convention for NMDA transition. Re: [netmod] upcoming adoptions"
      in NETMOD. <br>
      <br>
      However, we will have to tackle this discussion one day or the
      other: <br>
      - we need <u>an automatic way</u> to make the link between the
      YANG module in RFC8049 and the YANG module in
      draft-wu-l3sm-rfc8049bis, or any non backward compatible YANG
      modules.<br>
      - we need <u>an automatic way</u> to make the link between the
      YANG module in RFC8022 and the YANG module in
      draft-acee-netmod-rfc8022bis, or any new YANG module names used
      for NMDA transition.<br>
      Note: actually, we face two different problems.
      draft-wu-l3sm-rfc8049bis might be declared backward incompatible
      with RFC8049, while RFC8022bis is backward compatible with
      RFC8022. The RFC8022bis went for a new YANG module name
      ietf-routing-2 to avoid to document the -state tree (as
      deprecated), based on the argument that ietf-routing is not yet
      implemented.<br>
      <br>
      Which solutions do we have from here? <br>
      #1. We keep the same module name and express that the YANG module
      in draft-wu-l3sm-rfc8049bis is not backward compatible with the
      RFC8049 one. This is the openconfig way. See
      draft-clacla-netmod-model-catalog (and
      draft-openconfig-netmod-model-catalog before)<small><br>
      </small>
      <blockquote>
        <pre>  // extension statements
     extension openconfig-version {
       argument "semver" {
         yin-element false;
       }
       description
         "The OpenConfig version number for the module. This is
         expressed as a semantic version number of the form:
           x.y.z
          where:
           * x corresponds to the major version,
           * y corresponds to a minor version,
           * z corresponds to a patch version.
         This version corresponds to the model file within which it is
         defined, and does not cover the whole set of OpenConfig models.
         Where several modules are used to build up a single block of
         functionality, the same module version is specified across each
         file that makes up the module.

         A major version number of 0 indicates that this model is still
         in development (whether within OpenConfig or with industry
         partners), and is potentially subject to change.

         Following a release of major version 1, all modules will
         increment major revision number where backwards incompatible
         changes to the model are made.

         The minor version is changed when features are added to the
         model that do not impact current clients use of the model.

         The patch-level version is incremented when non-feature changes
         (such as bugfixes or clarifications to human-readable
         descriptions that do not impact model functionality) are made
         that maintain backwards compatibility.

         The version number is stored in the module meta-data.";
     }</pre>
      </blockquote>
      Similarly, we always keep the same YANG module name in case of
      NMDA transition. So ietf-routing-2 should be changed back to
      ietf-routing.<br>
      The email thread "[Rtg-dt-yang-arch] ietf-routing or
      ietf-routing-2? module naming convention for NMDA transition. Re:
      [netmod] upcoming adoptions" seems to go in that direction.<br>
      <br>
      #2. Or we have a different module name, let's say ietf-l3vpn-svc-2
      or ietf-routing-2 but then, how do we make the link with the
      previous module? <br>
      Then ...  What? We create extension that will link the
      draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module?
      Same principle as #1, but just more complex. <br>
      Or we have a new YANG keyword (this implies YANG 2.0)<br>
      <blockquote>
        <pre class="newpage">&lt;CODE BEGINS&gt;file <a
class="moz-txt-link-rfc2396E"
href="mailto:ietf-l3vpn-svc@2017-09-14.yang">"ietf-l3vpn-svc@2017-09-14.yang"</a>
module ietf-l3vpn-svc-2 {
 yang-version 1.1;
 namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
 prefix l3vpn-svc;
 <b><u>obsolete|update </u></b>ietf-l3vpn-svc@2017-01-2
</pre>
      </blockquote>
      And whose responsibility is this to warn/push all authors of
      ietf-routing YANG modules to move to ietf-routing-2? (*)<br>
      <br>
      The following are non solution IMO:<br>
      - Going from the draft-wu-l3sm-rfc8049bis YANG <u>module </u>to
      the draft-wu-l3sm-rfc8049bis <u>document </u>to lookup the IETF
      "obsolete" flag in order to understand that the RFC8049 YANG
      module is obsolete is not an automatic solution.<br>
      - Using the yangcatalog.org might be a solution as we track the
      derived semantic, but this is just an offline trick. This is not
      what I call "automatic way"<br>
      - Using the YANG module description field might be interesting,
      but again this is not an "automatic way":<br>
      <blockquote>
        <pre class="newpage"> description
  "This YANG module defines a generic service configuration
   model for Layer 3 VPNs. This model is common across all
   vendor implementations. This obsoletes the RFC8049 YANG 
   module, ietf-l3vpn-svc@2017-01-2";
 revision 2017-09-14 {
  description
  
"First revision of <a href="https://tools.ietf.org/html/rfc8049">RFC8049</a>.";
  reference
   "RFC xxxx: YANG Data Model for L3VPN Service Delivery";</pre>
      </blockquote>
      <br>
      In conclusion, I believe openconfig got this right and that
      solution #1 is the solution to go ... while waiting for a new YANG
      keyword in YANG 2.0<br>
      <br>
      (*) If you want to change the module from ietf-routing to
      ietf-routing-2, then you should follow with all authors of
      dependent modules to make sure they transition to ietf-routing-2<br>
      In the yangcatalog.org, because I needed the information as OPS
      AD, we created a small script to get that authors list for IETF
      drafts. For the ietf-routing, this produces the following<br>
      {<br>
          "output": {<br>
              "author-email": [<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-mpls-static-yang@ietf.org">"draft-ietf-mpls-static-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-mpls-base-yang@ietf.org">"draft-ietf-mpls-base-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-ospf-sr-yang@ietf.org">"draft-ietf-ospf-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-pim-yang@ietf.org">"draft-ietf-pim-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-bier-bier-yang@ietf.org">"draft-ietf-bier-bier-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-zhang-bier-te-yang@ietf.org">"draft-zhang-bier-te-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-isis-yang-isis-cfg@ietf.org">"draft-ietf-isis-yang-isis-cfg@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-teas-yang-rsvp-te@ietf.org">"draft-ietf-teas-yang-rsvp-te@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-mpls-mldp-yang@ietf.org">"draft-ietf-mpls-mldp-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-zhao-pim-igmp-mld-snooping-yang@ietf.org">"draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-isis-sr-yang@ietf.org">"draft-ietf-isis-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-acee-rtgwg-yang-rib-extend@ietf.org">"draft-acee-rtgwg-yang-rib-extend@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-pim-igmp-mld-yang@ietf.org">"draft-ietf-pim-igmp-mld-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-i2rs-fb-rib-data-model@ietf.org">"draft-ietf-i2rs-fb-rib-data-model@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-ospf-yang@ietf.org">"draft-ietf-ospf-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-rtgwg-yang-rip@ietf.org">"draft-ietf-rtgwg-yang-rip@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-spring-sr-yang@ietf.org">"draft-ietf-spring-sr-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-teas-yang-rsvp@ietf.org">"draft-ietf-teas-yang-rsvp@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-i2rs-pkt-eca-data-model@ietf.org">"draft-ietf-i2rs-pkt-eca-data-model@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-mpls-ldp-yang@ietf.org">"draft-ietf-mpls-ldp-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-bfd-yang@ietf.org">"draft-ietf-bfd-yang@ietf.org"</a>,<br>
                  <a class="moz-txt-link-rfc2396E"
       
href="mailto:draft-ietf-pim-msdp-yang@ietf.org">"draft-ietf-pim-msdp-yang@ietf.org"</a><br>
              ]<br>
          }<br>
      }<br>
      <br>
      Fortunately, we only deal with IETF dependent YANG modules in case
      of the ietf-routing. That's an easier case.<br>
      If we would change ietf-interfaces to ietf-interfaces-2, we would
      have an cross SDO issue ... Btw, there are no automatic ways to
      extract the authors of YANG modules from different SDOs: it's only
      a metadata that that the different SDOs should insert in the
      yangcatalog. So we would have to rely on liaisons or direct
      emails, assuming we know the authors. Time consuming, believe me.<br>
      <br>
      Regards, Benoit<br>
    </div>
    <blockquote type="cite"
      cite="mid:caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net">
      <pre wrap="">Hi,

    As part of the my Routing Directorate review of
draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
changes being made to the ietf-l3vpn-svc module without changing the
name.  I raised this with the YANG doctors and others involved with the
draft and it surfaced some topics which really should be discussed here
in NetMod.

The background (as explained off-list by others, so I hope I have it
right)  is that one of the YANG Doctors noted that RFC8049 was broken
and could not be implemented as defined, and therefore a fix was
needed.  L3SM has concluded so the fix is in the individual draft
draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
module could not be implemented, the feeling by the YANG Dr was that
even though the new module is incompatible with the original definition
the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
RFC 6020) didn't have to be followed and the same name could be used.

In the subsequent discussion with the YANG Drs., the general discussion
was heading down the path of using a new module name, and thereby not
violating YANG module update rules.  This lead us back to the a similar
discussion we've been having in the context of 8022bis: how best to
indicate that a whole module is being obsoleted.  RFCs do this by adding
'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
help YANG tooling.  For 8022, we have one approach - publishing an
updated rev of the original module marking all nodes as deprecated - but
that doesn't really make sense for rfc8049bis.

So the discussion for the WG is:

How do we handle incompatible module changes, notably when one module
'obsoletes' another module --  from both the process and tooling
perspectives?

I know Benoit plans to bring in some thoughts/proposals, perhaps there
are others.

Cheers,

Lou

(as contributor/reviewer)


.

</pre>
    </blockquote>
    <br>
  </blockquote>
</div>
</div>
</body>
</html>

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To: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>
Cc: rtg-dir@ietf.org, draft-acee-netmod-rfc8022bis@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
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From: Benoit Claise <bclaise@cisco.com>
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Subject: Re: [RTG-DIR] handling module incompatibility => handling module transition
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Hi Lou,
>
> So circling back to the original question: what do we do about the non 
> backward-compatible module being defined in rfc8049bis?
>
> While being sympathetic to many of the comments made below as well as 
> the "do over" concept, I find the comments about adhering to the rules 
> of 7950 compelling - which leads to renaming the module in the bis to 
> ietf-l3vpn-svc-2.
>
> It would be good to ensure that this is the consensus of the group 
> before asking the authors make this change.
>
Since this draft is AD sponsored, I'll evaluate the consensus on RFC8049bis.
Moving to ietf-l3vpn-svc-2 is the easy path not to break backward 
compatibility. However, since ietf-l3vpn-svc is unimplementable (it has 
broken XPATH expressions, so a compliant implementation is impossible), 
so technically, ietf-l3vpn-svc does not even exist.

What NETMOD should focus on is closing on the NMDA transition: the 
ietf-routing versus ietf-routing-2 issue.
Way bigger impact in terms of dependent YANG modules

Regards, Benoit (as OPS AD)
See below.
>
> This change course doesn't solve the versioning issue discussed below, 
> but this is not a new issue it's just the first time we'll actually 
> executing the steps envisioned as part of the rules laid out in yang. 
> My personal take away is that means that we should immediately start 
> work on an extension defining along the lines of  ' 
> *_obsolete|update_*' mentioned below.
>
I believe that option 1 is the more pragmatic and complete solution. 
option 2 is just half a step in the right direction.
I believe we should discuss this topic in Singapore.

Regards, Benoit (as individual contributor)
>
> Lou
>
> On October 8, 2017 10:59:15 AM Benoit Claise <bclaise@cisco.com> wrote:
>
>> Dear all,
>>
>> Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049 is 
>> broken. The small problem is: trying to maintain backward compatibility.
>> draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.
>>
>> Let me extend the scope of this email thread from "handling module 
>> incompatibility" to "handling module incompatibility and NMDA 
>> transition".
>> As I mentioned in the past (see "semver.org comparison of two YANG 
>> modules" email in NETMOD), I believe the IETF will have to change its 
>> way of working in terms of backward compatibility. See also the email 
>> "ietf-routing or ietf-routing-2? module naming convention for NMDA 
>> transition. Re: [netmod] upcoming adoptions" in NETMOD.
>>
>> However, we will have to tackle this discussion one day or the other:
>> - we need _an automatic way_ to make the link between the YANG module 
>> in RFC8049 and the YANG module in draft-wu-l3sm-rfc8049bis, or any 
>> non backward compatible YANG modules.
>> - we need _an automatic way_ to make the link between the YANG module 
>> in RFC8022 and the YANG module in draft-acee-netmod-rfc8022bis, or 
>> any new YANG module names used for NMDA transition.
>> Note: actually, we face two different problems. 
>> draft-wu-l3sm-rfc8049bis might be declared backward incompatible with 
>> RFC8049, while RFC8022bis is backward compatible with RFC8022. The 
>> RFC8022bis went for a new YANG module name ietf-routing-2 to avoid to 
>> document the -state tree (as deprecated), based on the argument that 
>> ietf-routing is not yet implemented.
>>
>> Which solutions do we have from here?
>> #1. We keep the same module name and express that the YANG module in 
>> draft-wu-l3sm-rfc8049bis is not backward compatible with the RFC8049 
>> one. This is the openconfig way. See 
>> draft-clacla-netmod-model-catalog (and 
>> draft-openconfig-netmod-model-catalog before)
>>
>>        // extension statements
>>           extension openconfig-version {
>>             argument "semver" {
>>               yin-element false;
>>             }
>>             description
>>               "The OpenConfig version number for the module. This is
>>               expressed as a semantic version number of the form:
>>                 x.y.z
>>                where:
>>                 * x corresponds to the major version,
>>                 * y corresponds to a minor version,
>>                 * z corresponds to a patch version.
>>               This version corresponds to the model file within which it is
>>               defined, and does not cover the whole set of OpenConfig models.
>>               Where several modules are used to build up a single block of
>>               functionality, the same module version is specified across each
>>               file that makes up the module.
>>
>>               A major version number of 0 indicates that this model is still
>>               in development (whether within OpenConfig or with industry
>>               partners), and is potentially subject to change.
>>
>>               Following a release of major version 1, all modules will
>>               increment major revision number where backwards incompatible
>>               changes to the model are made.
>>
>>               The minor version is changed when features are added to the
>>               model that do not impact current clients use of the model.
>>
>>               The patch-level version is incremented when non-feature changes
>>               (such as bugfixes or clarifications to human-readable
>>               descriptions that do not impact model functionality) are made
>>               that maintain backwards compatibility.
>>
>>               The version number is stored in the module meta-data.";
>>           }
>>
>> Similarly, we always keep the same YANG module name in case of NMDA 
>> transition. So ietf-routing-2 should be changed back to ietf-routing.
>> The email thread "[Rtg-dt-yang-arch] ietf-routing or ietf-routing-2? 
>> module naming convention for NMDA transition. Re: [netmod] upcoming 
>> adoptions" seems to go in that direction.
>>
>> #2. Or we have a different module name, let's say ietf-l3vpn-svc-2 or 
>> ietf-routing-2 but then, how do we make the link with the previous 
>> module?
>> Then ...  What? We create extension that will link the 
>> draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module? Same 
>> principle as #1, but just more complex.
>> Or we have a new YANG keyword (this implies YANG 2.0)
>>
>>     <CODE BEGINS>file"ietf-l3vpn-svc@2017-09-14.yang"
>>     module ietf-l3vpn-svc-2 {
>>       yang-version 1.1;
>>       namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
>>       prefix l3vpn-svc;
>>       *_obsolete|update _*ietf-l3vpn-svc@2017-01-2
>>
>> And whose responsibility is this to warn/push all authors of 
>> ietf-routing YANG modules to move to ietf-routing-2? (*)
>>
>> The following are non solution IMO:
>> - Going from the draft-wu-l3sm-rfc8049bis YANG _module _to the 
>> draft-wu-l3sm-rfc8049bis _document _to lookup the IETF "obsolete" 
>> flag in order to understand that the RFC8049 YANG module is obsolete 
>> is not an automatic solution.
>> - Using the yangcatalog.org might be a solution as we track the 
>> derived semantic, but this is just an offline trick. This is not what 
>> I call "automatic way"
>> - Using the YANG module description field might be interesting, but 
>> again this is not an "automatic way":
>>
>>       description
>>        "This YANG module defines a generic service configuration
>>         model for Layer 3 VPNs. This model is common across all
>>         vendor implementations. This obsoletes the RFC8049 YANG
>>         module, ietf-l3vpn-svc@2017-01-2";
>>       revision 2017-09-14 {
>>        description
>>        
>>     "First revision ofRFC8049 <https://tools.ietf.org/html/rfc8049>.";
>>        reference
>>         "RFC xxxx: YANG Data Model for L3VPN Service Delivery";
>>
>>
>> In conclusion, I believe openconfig got this right and that solution 
>> #1 is the solution to go ... while waiting for a new YANG keyword in 
>> YANG 2.0
>>
>> (*) If you want to change the module from ietf-routing to 
>> ietf-routing-2, then you should follow with all authors of dependent 
>> modules to make sure they transition to ietf-routing-2
>> In the yangcatalog.org, because I needed the information as OPS AD, 
>> we created a small script to get that authors list for IETF drafts. 
>> For the ietf-routing, this produces the following
>> {
>>     "output": {
>>         "author-email": [
>> "draft-ietf-mpls-static-yang@ietf.org",
>> "draft-ietf-mpls-base-yang@ietf.org",
>> "draft-ietf-ospf-sr-yang@ietf.org",
>> "draft-ietf-pim-yang@ietf.org",
>> "draft-ietf-bier-bier-yang@ietf.org",
>> "draft-zhang-bier-te-yang@ietf.org",
>> "draft-ietf-isis-yang-isis-cfg@ietf.org",
>> "draft-ietf-teas-yang-rsvp-te@ietf.org",
>> "draft-ietf-mpls-mldp-yang@ietf.org",
>> "draft-zhao-pim-igmp-mld-snooping-yang@ietf.org",
>> "draft-ietf-isis-sr-yang@ietf.org",
>> "draft-acee-rtgwg-yang-rib-extend@ietf.org",
>> "draft-ietf-pim-igmp-mld-yang@ietf.org",
>> "draft-ietf-i2rs-fb-rib-data-model@ietf.org",
>> "draft-ietf-ospf-yang@ietf.org",
>> "draft-ietf-rtgwg-yang-rip@ietf.org",
>> "draft-ietf-spring-sr-yang@ietf.org",
>> "draft-ietf-teas-yang-rsvp@ietf.org",
>> "draft-ietf-i2rs-pkt-eca-data-model@ietf.org",
>> "draft-ietf-mpls-ldp-yang@ietf.org",
>> "draft-ietf-bfd-yang@ietf.org",
>> "draft-ietf-pim-msdp-yang@ietf.org"
>>         ]
>>     }
>> }
>>
>> Fortunately, we only deal with IETF dependent YANG modules in case of 
>> the ietf-routing. That's an easier case.
>> If we would change ietf-interfaces to ietf-interfaces-2, we would 
>> have an cross SDO issue ... Btw, there are no automatic ways to 
>> extract the authors of YANG modules from different SDOs: it's only a 
>> metadata that that the different SDOs should insert in the 
>> yangcatalog. So we would have to rely on liaisons or direct emails, 
>> assuming we know the authors. Time consuming, believe me.
>>
>> Regards, Benoit
>>> Hi,
>>>
>>>      As part of the my Routing Directorate review of
>>> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
>>> changes being made to the ietf-l3vpn-svc module without changing the
>>> name.  I raised this with the YANG doctors and others involved with the
>>> draft and it surfaced some topics which really should be discussed here
>>> in NetMod.
>>>
>>> The background (as explained off-list by others, so I hope I have it
>>> right)  is that one of the YANG Doctors noted that RFC8049 was broken
>>> and could not be implemented as defined, and therefore a fix was
>>> needed.  L3SM has concluded so the fix is in the individual draft
>>> draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
>>> module could not be implemented, the feeling by the YANG Dr was that
>>> even though the new module is incompatible with the original definition
>>> the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
>>> RFC 6020) didn't have to be followed and the same name could be used.
>>>
>>> In the subsequent discussion with the YANG Drs., the general discussion
>>> was heading down the path of using a new module name, and thereby not
>>> violating YANG module update rules.  This lead us back to the a similar
>>> discussion we've been having in the context of 8022bis: how best to
>>> indicate that a whole module is being obsoleted.  RFCs do this by adding
>>> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
>>> help YANG tooling.  For 8022, we have one approach - publishing an
>>> updated rev of the original module marking all nodes as deprecated - but
>>> that doesn't really make sense for rfc8049bis.
>>>
>>> So the discussion for the WG is:
>>>
>>> How do we handle incompatible module changes, notably when one module
>>> 'obsoletes' another module --  from both the process and tooling
>>> perspectives?
>>>
>>> I know Benoit plans to bring in some thoughts/proposals, perhaps there
>>> are others.
>>>
>>> Cheers,
>>>
>>> Lou
>>>
>>> (as contributor/reviewer)
>>>
>>>
>>>
>>>


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    <div class="moz-cite-prefix">Hi Lou,<br>
    </div>
    <blockquote type="cite"
      cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <div style="color: black;">
        <div style="color: black;">
          <p style="margin: 0 0 1em 0; color: black;">So circling back
            to the
            original question: what do we do about the non
            backward-compatible module
            being defined in rfc8049bis?</p>
          <p style="margin: 0 0 1em 0; color: black;">While being
            sympathetic to many
            of the comments made below as well as the "do over" concept,
            I find the
            comments about adhering to the rules of 7950 compelling -
            which leads to
            renaming the module in the bis to ietf-l3vpn-svc-2.</p>
          <p style="margin: 0 0 1em 0; color: black;">It would be good
            to ensure that
            this is the consensus of the group before asking the authors
            make this
            change.</p>
        </div>
      </div>
    </blockquote>
    Since this draft is AD sponsored, I'll evaluate the consensus on
    RFC8049bis.<br>
    Moving to ietf-l3vpn-svc-2 is the easy path not to break backward
    compatibility. However, since ietf-l3vpn-svc is unimplementable (it
    has broken XPATH expressions, so a compliant implementation is
    impossible), so technically, ietf-l3vpn-svc does not even exist. <br>
    <br>
    What NETMOD should focus on is closing on the NMDA transition: the
    ietf-routing versus ietf-routing-2 issue. <br>
    Way bigger impact in terms of dependent YANG modules<br>
    <br>
    Regards, Benoit (as OPS AD)<br>
    See below.<br>
    <blockquote type="cite"
      cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
      <div style="color: black;">
        <div style="color: black;">
          <p style="margin: 0 0 1em 0; color: black;">This change course
            doesn't
            solve the versioning issue discussed below, but this is not
            a new issue
            it's just the first time we'll actually executing the steps
            envisioned as
            part of the rules laid out in yang. My personal take away is
            that means
            that we should immediately start work on an extension
            defining along the
            lines of  ' <b><u>obsolete|update</u></b>' mentioned below.</p>
        </div>
      </div>
    </blockquote>
    I believe that option 1 is the more pragmatic and complete solution.
    option 2 is just half a step in the right direction. <br>
    I believe we should discuss this topic in Singapore.<br>
    <br>
    Regards, Benoit (as individual contributor)<br>
    <blockquote type="cite"
      cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
      <div style="color: black;">
        <div style="color: black;">
          <p style="margin: 0 0 1em 0; color: black;">Lou<br>
          </p>
        </div>
        <div style="color: black;">
          <p style="color: black; font-size: 10pt; font-family: Arial,
            sans-serif; margin: 10pt 0;">On
            October 8, 2017 10:59:15 AM Benoit Claise
            <a class="moz-txt-link-rfc2396E" href="mailto:bclaise@cisco.com">&lt;bclaise@cisco.com&gt;</a> wrote:</p>
          <blockquote type="cite" class="gmail_quote" style="margin: 0 0
            0 0.75ex; border-left: 1px solid #808080; padding-left:
            0.75ex;">
            <div class="moz-cite-prefix">Dear all,<br>
              <br>
              Focusing on draft-wu-l3sm-rfc8049bis, the big problem is:
              RFC8049 is broken. The small problem is: trying to
              maintain backward compatibility.<br>
              draft-wu-l3sm-rfc8049bis has rightly focused on the big
              problem.<br>
              <br>
              Let me extend the scope of this email thread from
              "handling module incompatibility" to "handling module
              incompatibility and NMDA transition".<br>
              As I mentioned in the past (see "semver.org comparison of
              two YANG modules" email in NETMOD), I believe the IETF
              will have to change its way of working in terms of
              backward compatibility. See also the email "ietf-routing
              or ietf-routing-2? module naming convention for NMDA
              transition. Re: [netmod] upcoming adoptions" in NETMOD. <br>
              <br>
              However, we will have to tackle this discussion one day or
              the other: <br>
              - we need <u>an automatic way</u> to make the link
              between the YANG module in RFC8049 and the YANG module in
              draft-wu-l3sm-rfc8049bis, or any non backward compatible
              YANG modules.<br>
              - we need <u>an automatic way</u> to make the link
              between the YANG module in RFC8022 and the YANG module in
              draft-acee-netmod-rfc8022bis, or any new YANG module names
              used for NMDA transition.<br>
              Note: actually, we face two different problems.
              draft-wu-l3sm-rfc8049bis might be declared backward
              incompatible with RFC8049, while RFC8022bis is backward
              compatible with RFC8022. The RFC8022bis went for a new
              YANG module name ietf-routing-2 to avoid to document the
              -state tree (as deprecated), based on the argument that
              ietf-routing is not yet implemented.<br>
              <br>
              Which solutions do we have from here? <br>
              #1. We keep the same module name and express that the YANG
              module in draft-wu-l3sm-rfc8049bis is not backward
              compatible with the RFC8049 one. This is the openconfig
              way. See draft-clacla-netmod-model-catalog (and
              draft-openconfig-netmod-model-catalog before)<small><br>
              </small>
              <blockquote>
                <pre>  // extension statements
     extension openconfig-version {
       argument "semver" {
         yin-element false;
       }
       description
         "The OpenConfig version number for the module. This is
         expressed as a semantic version number of the form:
           x.y.z
          where:
           * x corresponds to the major version,
           * y corresponds to a minor version,
           * z corresponds to a patch version.
         This version corresponds to the model file within which it is
         defined, and does not cover the whole set of OpenConfig models.
         Where several modules are used to build up a single block of
         functionality, the same module version is specified across each
         file that makes up the module.

         A major version number of 0 indicates that this model is still
         in development (whether within OpenConfig or with industry
         partners), and is potentially subject to change.

         Following a release of major version 1, all modules will
         increment major revision number where backwards incompatible
         changes to the model are made.

         The minor version is changed when features are added to the
         model that do not impact current clients use of the model.

         The patch-level version is incremented when non-feature changes
         (such as bugfixes or clarifications to human-readable
         descriptions that do not impact model functionality) are made
         that maintain backwards compatibility.

         The version number is stored in the module meta-data.";
     }</pre>
              </blockquote>
              Similarly, we always keep the same YANG module name in
              case of NMDA transition. So ietf-routing-2 should be
              changed back to ietf-routing.<br>
              The email thread "[Rtg-dt-yang-arch] ietf-routing or
              ietf-routing-2? module naming convention for NMDA
              transition. Re: [netmod] upcoming adoptions" seems to go
              in that direction.<br>
              <br>
              #2. Or we have a different module name, let's say
              ietf-l3vpn-svc-2 or ietf-routing-2 but then, how do we
              make the link with the previous module? <br>
              Then ...  What? We create extension that will link the
              draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG
              module? Same principle as #1, but just more complex. <br>
              Or we have a new YANG keyword (this implies YANG 2.0)<br>
              <blockquote>
                <pre class="newpage">&lt;CODE BEGINS&gt;file <a class="moz-txt-link-rfc2396E" href="mailto:ietf-l3vpn-svc@2017-09-14.yang" moz-do-not-send="true">"ietf-l3vpn-svc@2017-09-14.yang"</a>
module ietf-l3vpn-svc-2 {
 yang-version 1.1;
 namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
 prefix l3vpn-svc;
 <b><u>obsolete|update </u></b>ietf-l3vpn-svc@2017-01-2
</pre>
              </blockquote>
              And whose responsibility is this to warn/push all authors
              of ietf-routing YANG modules to move to ietf-routing-2?
              (*)<br>
              <br>
              The following are non solution IMO:<br>
              - Going from the draft-wu-l3sm-rfc8049bis YANG <u>module
              </u>to the draft-wu-l3sm-rfc8049bis <u>document </u>to
              lookup the IETF "obsolete" flag in order to understand
              that the RFC8049 YANG module is obsolete is not an
              automatic solution.<br>
              - Using the yangcatalog.org might be a solution as we
              track the derived semantic, but this is just an offline
              trick. This is not what I call "automatic way"<br>
              - Using the YANG module description field might be
              interesting, but again this is not an "automatic way":<br>
              <blockquote>
                <pre class="newpage"> description
  "This YANG module defines a generic service configuration
   model for Layer 3 VPNs. This model is common across all
   vendor implementations. This obsoletes the RFC8049 YANG 
   module, ietf-l3vpn-svc@2017-01-2";
 revision 2017-09-14 {
  description
  
"First revision of <a href="https://tools.ietf.org/html/rfc8049" moz-do-not-send="true">RFC8049</a>.";
  reference
   "RFC xxxx: YANG Data Model for L3VPN Service Delivery";</pre>
              </blockquote>
              <br>
              In conclusion, I believe openconfig got this right and
              that solution #1 is the solution to go ... while waiting
              for a new YANG keyword in YANG 2.0<br>
              <br>
              (*) If you want to change the module from ietf-routing to
              ietf-routing-2, then you should follow with all authors of
              dependent modules to make sure they transition to
              ietf-routing-2<br>
              In the yangcatalog.org, because I needed the information
              as OPS AD, we created a small script to get that authors
              list for IETF drafts. For the ietf-routing, this produces
              the following<br>
              {<br>
                  "output": {<br>
                      "author-email": [<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-mpls-static-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-mpls-static-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-mpls-base-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-mpls-base-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-ospf-sr-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-ospf-sr-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-pim-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-pim-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-bier-bier-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-bier-bier-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-zhang-bier-te-yang@ietf.org"
                moz-do-not-send="true">"draft-zhang-bier-te-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-isis-yang-isis-cfg@ietf.org"
                moz-do-not-send="true">"draft-ietf-isis-yang-isis-cfg@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-teas-yang-rsvp-te@ietf.org"
                moz-do-not-send="true">"draft-ietf-teas-yang-rsvp-te@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-mpls-mldp-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-mpls-mldp-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"
                moz-do-not-send="true">"draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-isis-sr-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-isis-sr-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-acee-rtgwg-yang-rib-extend@ietf.org"
                moz-do-not-send="true">"draft-acee-rtgwg-yang-rib-extend@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-pim-igmp-mld-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-pim-igmp-mld-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-i2rs-fb-rib-data-model@ietf.org"
                moz-do-not-send="true">"draft-ietf-i2rs-fb-rib-data-model@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-ospf-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-ospf-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-rtgwg-yang-rip@ietf.org"
                moz-do-not-send="true">"draft-ietf-rtgwg-yang-rip@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-spring-sr-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-spring-sr-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-teas-yang-rsvp@ietf.org"
                moz-do-not-send="true">"draft-ietf-teas-yang-rsvp@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-i2rs-pkt-eca-data-model@ietf.org"
                moz-do-not-send="true">"draft-ietf-i2rs-pkt-eca-data-model@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-mpls-ldp-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-mpls-ldp-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-bfd-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-bfd-yang@ietf.org"</a>,<br>
                          <a class="moz-txt-link-rfc2396E"
                href="mailto:draft-ietf-pim-msdp-yang@ietf.org"
                moz-do-not-send="true">"draft-ietf-pim-msdp-yang@ietf.org"</a><br>
                      ]<br>
                  }<br>
              }<br>
              <br>
              Fortunately, we only deal with IETF dependent YANG modules
              in case of the ietf-routing. That's an easier case.<br>
              If we would change ietf-interfaces to ietf-interfaces-2,
              we would have an cross SDO issue ... Btw, there are no
              automatic ways to extract the authors of YANG modules from
              different SDOs: it's only a metadata that that the
              different SDOs should insert in the yangcatalog. So we
              would have to rely on liaisons or direct emails, assuming
              we know the authors. Time consuming, believe me.<br>
              <br>
              Regards, Benoit<br>
            </div>
            <blockquote type="cite"
              cite="mid:caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net">
              <pre wrap="">Hi,

    As part of the my Routing Directorate review of
draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
changes being made to the ietf-l3vpn-svc module without changing the
name.  I raised this with the YANG doctors and others involved with the
draft and it surfaced some topics which really should be discussed here
in NetMod.

The background (as explained off-list by others, so I hope I have it
right)  is that one of the YANG Doctors noted that RFC8049 was broken
and could not be implemented as defined, and therefore a fix was
needed.  L3SM has concluded so the fix is in the individual draft
draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
module could not be implemented, the feeling by the YANG Dr was that
even though the new module is incompatible with the original definition
the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
RFC 6020) didn't have to be followed and the same name could be used.

In the subsequent discussion with the YANG Drs., the general discussion
was heading down the path of using a new module name, and thereby not
violating YANG module update rules.  This lead us back to the a similar
discussion we've been having in the context of 8022bis: how best to
indicate that a whole module is being obsoleted.  RFCs do this by adding
'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
help YANG tooling.  For 8022, we have one approach - publishing an
updated rev of the original module marking all nodes as deprecated - but
that doesn't really make sense for rfc8049bis.

So the discussion for the WG is:

How do we handle incompatible module changes, notably when one module
'obsoletes' another module --  from both the process and tooling
perspectives?

I know Benoit plans to bring in some thoughts/proposals, perhaps there
are others.

Cheers,

Lou

(as contributor/reviewer)




</pre>
            </blockquote>
          </blockquote>
        </div>
      </div>
    </blockquote>
    <br>
  </body>
</html>

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Thanks David,

> Abstract: "... used within the IETF...". Wouldn't the document serve =
better to
> describe how the models could/are used by the industry including =
within SDN?
> Several of these models are used by other SDOs for their work in e.g., =
providing
> network architecture, equipment requirements, orchestration, OAM and
> management to support and provide the service. I would think that the =
matter
> of how these are used by the IETF would be much to narrow a view.

The IETF does not, I think, strive to speak for other SDOs. While it can =
speak for a slice of the industry, it is only that slice that =
participates at the IETF. So what we do best is describe what we have =
built.

Of course, if other SDOs like what we have done, they can reference it.

> Intro para 3, last sentences - This text dates itself. It would =
suffice to note that
> the models may be used in these environments regardless of the time =
frame.=20
> (e.g., drop =E2=80=9Ceventually)

Hmmm, you reviewed -03? So this would be the last sentence of para 4.
You are right that this could become dated.
Don't mind making that change.

> Intro para 5 last sentence - customer - Provider Interface needs a =
forward
> reference or brief definition. =E2=80=A8

Perhaps we should say "through the interface between the customer and =
the provider."  There is nothing clever here. Just that there is an =
interface.

> Intro para 6. - "described to" or "subscribed to"? =E2=80=A8

We meant "described to". Is there a problem with describing a service to =
a customer?

> Intro para 6 - does it describe the service or the attributes of the =
service. I'm not sure
> a service model describes the service operation.  Add the words =
"attributes of the" =E2=80=A8

You added the word "operation".
How would you describe a service except through the attributes of that =
service. But "describing the attributes" conveys (to me) something less =
than describing the service.

> Sec 1, para 4 - =E2=80=9C... within the IETF...=E2=80=9D but the =
document also discusses the MEF. Need
> to make statement more general. =E2=80=A8

Weeeeeell, two brief paragraphs in a 22 page document hardly makes MEF =
the focus of this work. I think the paragraph you quote from accurately =
describes this document.

> Definition of Network Operator - change to read "... other network =
services."
> Not sure other non-network services are intended. =E2=80=A8

The text reads...
|   Network Operator:  This term is used to refer to the company that
|     owns and operates one or more networks that provide Internet
|     connectivity services and/or other services.

Not sure where you found "other non-network services.=20

> Definition of Customer: suggest change =E2=80=9Cpurchases=E2=80=9D to =
=E2=80=9Csubscribes=E2=80=9D

The principal two definitions of "subscribe" are:

| to pledge, as by signing an agreement, to give or pay money as a
| contribution, gift, or investment=20

...and...

| to give or pay money in fulfillment of such a pledge.=20

That'll be "purchase" :-)

> Definition of Customer: Excludes residential customer... why?

I read and re-read. I don't find that exclusion.

But it is reasonable to infer that residential customers are peripheral =
to the discussion. The type of service purchased by a residential =
customer is very simple, but is still covered by the discussion as it is =
only a scaled down version of some types of serviced purchased by =
commercial organisations.

> Definition of Service: - Would help to give titles of RFCs, but may =
not be
> aligned with conventions.

Hmmm, no, I think the way this is presented is the normal IETF way.

> Definition of Data Model: Refers to information model and =
relationships
> between managed objects.  Should it be just objects?

The definition of Data Model quoted from RFC 3444 only has meaning when =
presented with the definition of Information Model. And, of course, we =
can't change the quoted text.

> Definition of Service model - in IETF it's a data model. In other =
groups? E.g., ITU? It
> could be an information model.

You may be right. I don't know. Personally, I might be interested in =
finding out, but surely it is not the job of the IETF to attempt to =
interpret and document other SDO's views?

> Definition of Customer Service Model: Not sure example of order =
fulfillment
> system illustrates a human.  Is there a better example of a human =
consumer?

I don't see the problem. An order fulfillment system in network =
management often (usually) has a human interface so that actions can be =
confirmed. Do you have any suggestions?

> Definition of Service model - "... a portable way". Portable way? or =
do
> you mean more agnostic to deployment architecture and equipment?

Yes, that is the usual meaning. We can spell it out.

> Last para just before section 3. - while a service model as a whole =
may not be
> intended to be sent to network devices, parts of it may be sent to =
network
> equipment. This could be clarified.

I think you are saying that one model may contain modules used in other =
models.

> Sec 3, 2nd para - =E2=80=9C... choice for whoever specifies the =
model.=E2=80=9D And the next
> sentence notes the IETF. Is the choice that of the organization where =
the
> model is specified, the individuals specifying the model or some =
combination
> of both?

The "whoever" is individuals or SDOs. However, individuals participating =
in the IETF use the mechanisms adopted by the IETF.

> Sec 3, para 1&2 - these two paragraphs don=E2=80=99t add to the =
discussion and
> distract from para 3 where the actual discussion starts.

Unless there is a big problem here, we like the text.

> Sec 3, para 3, last sentence - =E2=80=9C... direct human =
interaction...=E2=80=9D. This crosses
> from implementation to business process and should be noted. Add a
> sentence to the effect of =E2=80=9CWhere direct human interaction =
comes into
> play, interface interactions may become realized via business =
practices
> and must account for some margin of error, thus raising the priority =
for
> automated, deterministic interfaces.=E2=80=9D

That works.

> Figure 1 -move figure to the definition of customer service model

Added forward reference.

> Sec 3, para 8, last sentence - distinction of modules and models. Good
> description of modules, but needs to be contrasted vs models.

The description of "module" is provided by using the term "model". Are =
you proposing we should also add a definition of "model" using the term =
"module"? Wouldn't that just be saying the same thing only backwards.

> Sec 3, para 7 =E2=80=93=E2=80=9C The practicality=E2=80=A6=E2=80=9D  =
these last two paragraphs highlight a=20
> debate and the different points of view. This is different from the =
=E2=80=9Cbig
> picture=E2=80=9D usage description in the paragraphs above. =
Subsections (e.g.,=20
> =E2=80=9CThe Big Picture=E2=80=9D and =E2=80=9CPractically =
Speaking=E2=80=9D) would help call out the
> transition in thinking & flow.

OK

> Sec 4, heading or para 1, 1st sentence - =E2=80=9CSDN=E2=80=9D has =
been spelled out
> previously in the introduction but given the elementary level of
> explanation here, e.g., =E2=80=9Ccontroller=E2=80=9D, it may be worth =
spelling it out again.

OK

> Sec 4, para 2, 1st sentence - remove the =E2=80=9CBut=E2=80=9D or =
clarify what the statement
> is contradicting or juxtaposing.

OK

> Sec 4, para 2, 2nd sentence =E2=80=9C That is,=E2=80=A6=E2=80=9D - =
This statement should be clarified.=20
> Inherently the technology available to deliver a service will =
influence the
> functions that a customer can request. E.g., an Ethernet connectivity =
service
> will be defined in terms of MAC addresses, etc. I think the point =
trying to be=20
> made here is that the underlying technology specific details should =
not, or to
> the lowest extent possible, be reflected in customer service requests. =
E.g.,=20
> one should not have to specify switch or router ids, IP addresses or =
MAC
> addresses for a TV service. =E2=80=A8See section 7 of the document

I think you are mistaken. A customer can request *anything*. However, =
the service provider may not be able to deliver it :-)

But I see what you mean about this text.

OLD
   But a customer's service request is (or should be) technology-
   agnostic.  That is, the technology that the network operator has
   available to deliver the service should not influence the behavior
   and functions that a customer requests.  The orchestrator must map
   the service request to its view, and this mapping may include a
   choice of which networks and technologies to use depending on which
   service features have been requested.
NEW
   A customer's service request is (or should be) technology-
   agnostic.  That is, a customer is unware of the technology that the
   network operator has available to deliver the service and so the=20
   customer does not make requests specific to the underlying=20
   technology, but is limited to making requests specific to the
   service that is to be delivered.  The orchestrator must map
   the service request to its view, and this mapping may include a
   choice of which networks and technologies to use depending on which
   service features have been requested.
END

> Sec 4, para 2 & 3 - wouldn=E2=80=99t this point about a =
Service/Network split be true
> outside of the SDN context as well? Why would this be limited to SDN?

The discussion is limited to SDN simply because we're inside Section 4 =
("Service Models in an SDN Context").

> Sec 4, Figure 3 - could the figure show an orchestrator interacting
> directly to a network element?=20

That is possible, but surely a distraction and a dangerous diversion =
into debates about the architecture of an SDN system.
Apart from completeness, does it add anything to the document?

> Sec 5, bullet 1 - In the terminology section, =
=E2=80=9CService=E2=80=9D is defined as a connectivity
> service. For purposes of this document then it should not be confused =
with
> higher layer services. The =E2=80=9Ccustomer=E2=80=9D for this =
definition *is* aware of technology
> specific parameters and constraints of the connectivity service they =
are subscribing
> to. The cause of the confusion, and this is an age old problem, is =
that =E2=80=9Cservice=E2=80=9D is a
> recursive term. That is, a consumer/client of one level of service =
(e.g., Ethernet
> connectivity) is the provider/server of another (e.g., Internet =
access) for higher
> layer use (e.g., TV service) =E2=80=A8Modeling methods (G.805) have =
been established to
> describe the client/server relationship.

I agree with a lot of this. But you need to be careful talking about =
"technology of the service". Yes, the service is technology-specific =
(e.g., give me an Ethernet connection from here to there"), but, no, the =
service is technology-agnostic (don't care if this is native Ethernet, =
EoMPLS, EoATM, or whatever, and don't care whether OSPF, ISIS, BGP, or =
widgetFlow is used to set up the service).

That said, not sure what you are asking for.

> Sec 5, bullet 2 - =E2=80=9Ccompletely=E2=80=9D -> might want to tone =
this down a bit, to=20
> accommodate exceptions noted elsewhere in the document. While kept
> to a minimum, network operation is not *completely* out of scope when
> discussing service between a customer and network operator. E.g., Part
> of a service could be routing of the connect to avoid geopolitical =
borders.
> (Noted on the very next page) another example is, Fault notification =
and
> protection mechanisms may be discussed. =E2=80=A8The statement here =
seems to
> contradict the definition of Customer Service Model in the terminology
> section where it states that =E2=80=9CExcept where specific technology =
details
> (such as encapsulations, or mechanisms applied on access links) are =
directly
> pertinent to the customer, customer service models are technology =
agnostic
> so that the customer does not have influence over or knowledge of how =
the
> network operator engineers the service.=E2=80=9D =E2=80=A8Perhaps use =
=E2=80=9Cnormally=E2=80=9D vs
> =E2=80=9Ccompletely=E2=80=9D

OK2

> Sec 5, bullet 2 - providing detail about how the service is offered =
could
> actually be considered a security vulnerability.

OK

> Sec 5, bullet 4 - give some examples of =E2=80=9Ccommercial =
terms=E2=80=9D.

OK

> Sec 5, bullet 5 - give an example of the =E2=80=9Cfine grained =
details=E2=80=9D

We already have "how services are allowed to vary, by how much, and how =
often"

> Sec 6.2 list of drafts - will these works in progress be stable or
> final before publication?

I suspect they will still be works in progress, but who can tell the =
wonders of the IETF process.

> Sec 6.4, para 2,3rd sentence - the statement on it being impractical =
to
> fit IETF models into MEF models seems a bit broad. Has anyone looked
> into this?=20

Oh yes. :-) Some energy was expended looking at LSO.

Well, we have "may be impractical" so the door is open.

Thanks again,
Adrian


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From: Qin Wu <bill.wu@huawei.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "Robert Wilton" <rwilton@cisco.com>
CC: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-wu-l3sm-rfc8049bis.all@ietf.org" <draft-wu-l3sm-rfc8049bis.all@ietf.org>
Thread-Topic: [netmod] handling module incompatibility
Thread-Index: AQHTPqafiD0PunpOs0S5Nqqj+UPebKLWYU8AgAAinACACoL7wA==
Date: Fri, 13 Oct 2017 01:30:24 +0000
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References: <caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net> <ab4704c2-17b7-f789-535a-9aa88aa92e9c@cisco.com> <20171006165342.syfqsjsdmr2tzgqg@elstar.local>
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Cc: rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
From: Lou Berger <lberger@labn.net>
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Subject: [RTG-DIR] RtgDir review: draft-wu-l3sm-rfc8049bis-07
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Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and
sometimes on special request. The purpose of the review is to provide
assistance to the Routing ADs. For more information about the Routing
Directorate, please see
​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF
Last Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-wu-l3sm-rfc8049bis-07
Reviewer: Lou Berger
Review Date: Oct 13 2017
IETF LC End Date: date-if-known
Intended Status: Standards Track

Summary:

I have some major concerns about this document that I think should be
resolved before publication.

Comments:

This document is intended to provide a technical correction to the
syntactic flaws of the ietf-l3vpn-svc yang module defined in RFC 8049.
The changes are straightforward and have been cleared by the YANG Doctor
team with the one exception as discussed below.

Major Issues:

>From a strict reading of this document and the YANG Language definition
(RFC6020 or RFC7950) this document violates the MUST clauses in
https://tools.ietf.org/html/rfc7950#section-11 insofar as that
rfc8049bis has several definitions that are not compatible with those
defined in rfc8049 for the ietf-l3vpn-svc yang module, yet the bis does
not follow the requirement of RFC7950 to change the module
name/identifier. In discussion on the netmod WG list, the point has been
raised that this is acceptable as the module defined in rfc8049 should
never have been published in the first place as it is syntactically broken.

So there is a choice to be made, i.e., to either:

(a) publish this document as is and note a special exception to the
requirement of RFC7950 (an IETF consensus document), or

(b) update/change the module identifier in this document to conform with
RFC7950.

I think who makes this decision is an IETF process call and I deffer to
the IESG on this matter.

Lou
(as RtgDir reviewer, who also happens to co-chair the WG that has
technical responsibility for rfc7950.)


From nobody Sat Oct 14 00:05:43 2017
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To: Lou Berger <lberger@labn.net>, "rtg-ads@tools.ietf.org" <rtg-ads@tools.ietf.org>
Cc: rtg-dir@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org, Benoit Claise <bclaise@cisco.com>
References: <28df7f72-e9c5-07b0-e615-344783c0750f@labn.net>
From: Benoit Claise <bclaise@cisco.com>
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Subject: Re: [RTG-DIR] RtgDir review: draft-wu-l3sm-rfc8049bis-07
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Hi Lou,

Thanks for initiating this discussion on the YANG doctors and on the 
NETMOD mailing list.
The authors have produced v7 to address this comment.
I replied to the IETF LC message on this very specific topic, giving one 
week for feedback.
I can't point you to the archive, as my message awaits moderator 
approval (not sure why).
So here a cut/paste:

    Dear all,

    Based on the feedback received, the authors produced version 7.
    I would like to highlight those two changes (the only two changes btw).
    In the abstract:

        This document obsoletesRFC 8049 <https://tools.ietf.org/html/rfc8049>  to replace the unimplementable
        module in that RFC with a new module with the same name that is not
        backward compatible.  The changes are a series of small fixes to the
        YANG module, and some clarifications to the text.

    In section 1:

            The YANG module described in [RFC8049 <https://tools.ietf.org/html/rfc8049>] cannot be implemented because
            of issues around the use of XPATH.  This document obsoletes [RFC8049 <https://tools.ietf.org/html/rfc8049>]
            by creating a new module with the same name that is not backward
            compatible (in the sense described in YANG 1.1 [RFC7950 <https://tools.ietf.org/html/rfc7950>]).  The
            changes (listed in full inSection 1.4
        <https://tools.ietf.org/html/draft-wu-l3sm-rfc8049bis-07#section-1.4>) are small in scope, but
            include fixes to the module to make it possible to implement.

    Changes are highlighted here:
    https://tools.ietf.org/rfcdiff?url2=draft-wu-l3sm-rfc8049bis-07.txt
    Since RFC8049 is not implementable and therefore not implemented,
    keeping the same YANG module name seems about right.
    I'll collect feedback for a week. Note that this draft is on the
    IESG telechat on Oct 26th.

    Regards, Benoit


If a follow up is required, I propose that we use a single public email 
thread: the ietf@ietf.org

Regards, Benoit
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this draft.
> The Routing Directorate seeks to review all routing or routing-related
> drafts as they pass through IETF last call and IESG review, and
> sometimes on special request. The purpose of the review is to provide
> assistance to the Routing ADs. For more information about the Routing
> Directorate, please see
> ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
> Although these comments are primarily for the use of the Routing ADs, it
> would be helpful if you could consider them along with any other IETF
> Last Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>
> Document: draft-wu-l3sm-rfc8049bis-07
> Reviewer: Lou Berger
> Review Date: Oct 13 2017
> IETF LC End Date: date-if-known
> Intended Status: Standards Track
>
> Summary:
>
> I have some major concerns about this document that I think should be
> resolved before publication.
>
> Comments:
>
> This document is intended to provide a technical correction to the
> syntactic flaws of the ietf-l3vpn-svc yang module defined in RFC 8049.
> The changes are straightforward and have been cleared by the YANG Doctor
> team with the one exception as discussed below.
>
> Major Issues:
>
> >From a strict reading of this document and the YANG Language definition
> (RFC6020 or RFC7950) this document violates the MUST clauses in
> https://tools.ietf.org/html/rfc7950#section-11 insofar as that
> rfc8049bis has several definitions that are not compatible with those
> defined in rfc8049 for the ietf-l3vpn-svc yang module, yet the bis does
> not follow the requirement of RFC7950 to change the module
> name/identifier. In discussion on the netmod WG list, the point has been
> raised that this is acceptable as the module defined in rfc8049 should
> never have been published in the first place as it is syntactically broken.
>
> So there is a choice to be made, i.e., to either:
>
> (a) publish this document as is and note a special exception to the
> requirement of RFC7950 (an IETF consensus document), or
>
> (b) update/change the module identifier in this document to conform with
> RFC7950.
>
> I think who makes this decision is an IETF process call and I deffer to
> the IESG on this matter.
>
> Lou
> (as RtgDir reviewer, who also happens to co-chair the WG that has
> technical responsibility for rfc7950.)
>
> .
>


--------------8FD80B625C9699E9E35EFB7D
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <div class="moz-cite-prefix">Hi Lou,<br>
      <br>
      Thanks for initiating this discussion on the YANG doctors and on
      the NETMOD mailing list.<br>
      The authors have produced v7 to address this comment.<br>
      I replied to the IETF LC message on this very specific topic,
      giving one week for feedback.<br>
      I can't point you to the archive, as my message awaits moderator
      approval (not sure why).<br>
      So here a cut/paste:<br>
      <blockquote>Dear all,<br>
        <br>
        Based on the feedback received, the authors produced version 7.
        <br>
        I would like to highlight those two changes (the only two
        changes btw).<br>
        In the abstract:<br>
        <pre>   This document obsoletes <a href="https://tools.ietf.org/html/rfc8049">RFC 8049</a> to replace the unimplementable
   module in that RFC with a new module with the same name that is not
   backward compatible.  The changes are a series of small fixes to the
   YANG module, and some clarifications to the text.

</pre>
        In section 1:
        <blockquote>
          <pre class="newpage">   The YANG module described in [<a href="https://tools.ietf.org/html/rfc8049" title="&quot;YANG Data Model for L3VPN Service Delivery&quot;">RFC8049</a>] cannot be implemented because
   of issues around the use of XPATH.  This document obsoletes [<a href="https://tools.ietf.org/html/rfc8049" title="&quot;YANG Data Model for L3VPN Service Delivery&quot;">RFC8049</a>]
   by creating a new module with the same name that is not backward
   compatible (in the sense described in YANG 1.1 [<a href="https://tools.ietf.org/html/rfc7950" title="&quot;The YANG 1.1 Data Modeling Language&quot;">RFC7950</a>]).  The
   changes (listed in full in <a href="https://tools.ietf.org/html/draft-wu-l3sm-rfc8049bis-07#section-1.4">Section 1.4</a>) are small in scope, but
   include fixes to the module to make it possible to implement.</pre>
        </blockquote>
        Changes are highlighted here: <a class="moz-txt-link-freetext"
href="https://tools.ietf.org/rfcdiff?url2=draft-wu-l3sm-rfc8049bis-07.txt">https://tools.ietf.org/rfcdiff?url2=draft-wu-l3sm-rfc8049bis-07.txt</a><br>
        Since RFC8049 is not implementable and therefore not
        implemented, keeping the same YANG module name seems about
        right.<br>
        I'll collect feedback for a week. Note that this draft is on the
        IESG telechat on Oct 26th.<br>
        <br>
        Regards, Benoit</blockquote>
      <br>
      If a follow up is required, I propose that we use a single public
      email thread: the <a class="moz-txt-link-abbreviated" href="mailto:ietf@ietf.org">ietf@ietf.org</a> <br>
      <br>
      Regards, Benoit<br>
    </div>
    <blockquote type="cite"
      cite="mid:28df7f72-e9c5-07b0-e615-344783c0750f@labn.net">
      <pre wrap="">
Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and
sometimes on special request. The purpose of the review is to provide
assistance to the Routing ADs. For more information about the Routing
Directorate, please see
​<a class="moz-txt-link-freetext" href="http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a>

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF
Last Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-wu-l3sm-rfc8049bis-07
Reviewer: Lou Berger
Review Date: Oct 13 2017
IETF LC End Date: date-if-known
Intended Status: Standards Track

Summary:

I have some major concerns about this document that I think should be
resolved before publication.

Comments:

This document is intended to provide a technical correction to the
syntactic flaws of the ietf-l3vpn-svc yang module defined in RFC 8049.
The changes are straightforward and have been cleared by the YANG Doctor
team with the one exception as discussed below.

Major Issues:

&gt;From a strict reading of this document and the YANG Language definition
(RFC6020 or RFC7950) this document violates the MUST clauses in
<a class="moz-txt-link-freetext" href="https://tools.ietf.org/html/rfc7950#section-11">https://tools.ietf.org/html/rfc7950#section-11</a> insofar as that
rfc8049bis has several definitions that are not compatible with those
defined in rfc8049 for the ietf-l3vpn-svc yang module, yet the bis does
not follow the requirement of RFC7950 to change the module
name/identifier. In discussion on the netmod WG list, the point has been
raised that this is acceptable as the module defined in rfc8049 should
never have been published in the first place as it is syntactically broken.

So there is a choice to be made, i.e., to either:

(a) publish this document as is and note a special exception to the
requirement of RFC7950 (an IETF consensus document), or

(b) update/change the module identifier in this document to conform with
RFC7950.

I think who makes this decision is an IETF process call and I deffer to
the IESG on this matter.

Lou
(as RtgDir reviewer, who also happens to co-chair the WG that has
technical responsibility for rfc7950.)

.

</pre>
    </blockquote>
    <br>
  </body>
</html>

--------------8FD80B625C9699E9E35EFB7D--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-spring-lsp-ping.authors@ietf.org" <draft-ietf-mpls-spring-lsp-ping.authors@ietf.org>, "BRUNGARD, DEBORAH A" <db3546@att.com>
Thread-Topic: draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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Date: Sun, 15 Oct 2017 08:38:54 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/FUZF04yErf6O2L60WzYr-5YnZ3Q>
Subject: Re: [RTG-DIR] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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From: Benoit Claise <bclaise@cisco.com>
To: Lou Berger <lberger@labn.net>, NetMod WG <netmod@ietf.org>
Cc: rtg-dir@ietf.org, draft-acee-netmod-rfc8022bis@ietf.org, draft-wu-l3sm-rfc8049bis.all@ietf.org
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Subject: Re: [RTG-DIR] handling module incompatibility => handling module transition
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On 10/12/2017 3:30 PM, Benoit Claise wrote:
> Hi Lou,
>>
>> So circling back to the original question: what do we do about the 
>> non backward-compatible module being defined in rfc8049bis?
>>
>> While being sympathetic to many of the comments made below as well as 
>> the "do over" concept, I find the comments about adhering to the 
>> rules of 7950 compelling - which leads to renaming the module in the 
>> bis to ietf-l3vpn-svc-2.
>>
>> It would be good to ensure that this is the consensus of the group 
>> before asking the authors make this change.
>>
> Since this draft is AD sponsored, I'll evaluate the consensus on 
> RFC8049bis.
> Moving to ietf-l3vpn-svc-2 is the easy path not to break backward 
> compatibility. However, since ietf-l3vpn-svc is unimplementable (it 
> has broken XPATH expressions, so a compliant implementation is 
> impossible), so technically, ietf-l3vpn-svc does not even exist.
See my message on this topic, as the IETF LC follow up.
https://www.ietf.org/mail-archive/web/ietf-announce/current/maillist.html
If a follow up is required, I propose that we use a single public email 
thread: the ietf@ietf.org

Regards, Benoit
>
> What NETMOD should focus on is closing on the NMDA transition: the 
> ietf-routing versus ietf-routing-2 issue.
> Way bigger impact in terms of dependent YANG modules
>
> Regards, Benoit (as OPS AD)
> See below.
>>
>> This change course doesn't solve the versioning issue discussed 
>> below, but this is not a new issue it's just the first time we'll 
>> actually executing the steps envisioned as part of the rules laid out 
>> in yang. My personal take away is that means that we should 
>> immediately start work on an extension defining along the lines of  ' 
>> *_obsolete|update_*' mentioned below.
>>
> I believe that option 1 is the more pragmatic and complete solution. 
> option 2 is just half a step in the right direction.
> I believe we should discuss this topic in Singapore.
>
> Regards, Benoit (as individual contributor)
>>
>> Lou
>>
>> On October 8, 2017 10:59:15 AM Benoit Claise <bclaise@cisco.com> wrote:
>>
>>> Dear all,
>>>
>>> Focusing on draft-wu-l3sm-rfc8049bis, the big problem is: RFC8049 is 
>>> broken. The small problem is: trying to maintain backward compatibility.
>>> draft-wu-l3sm-rfc8049bis has rightly focused on the big problem.
>>>
>>> Let me extend the scope of this email thread from "handling module 
>>> incompatibility" to "handling module incompatibility and NMDA 
>>> transition".
>>> As I mentioned in the past (see "semver.org comparison of two YANG 
>>> modules" email in NETMOD), I believe the IETF will have to change 
>>> its way of working in terms of backward compatibility. See also the 
>>> email "ietf-routing or ietf-routing-2? module naming convention for 
>>> NMDA transition. Re: [netmod] upcoming adoptions" in NETMOD.
>>>
>>> However, we will have to tackle this discussion one day or the other:
>>> - we need _an automatic way_ to make the link between the YANG 
>>> module in RFC8049 and the YANG module in draft-wu-l3sm-rfc8049bis, 
>>> or any non backward compatible YANG modules.
>>> - we need _an automatic way_ to make the link between the YANG 
>>> module in RFC8022 and the YANG module in 
>>> draft-acee-netmod-rfc8022bis, or any new YANG module names used for 
>>> NMDA transition.
>>> Note: actually, we face two different problems. 
>>> draft-wu-l3sm-rfc8049bis might be declared backward incompatible 
>>> with RFC8049, while RFC8022bis is backward compatible with RFC8022. 
>>> The RFC8022bis went for a new YANG module name ietf-routing-2 to 
>>> avoid to document the -state tree (as deprecated), based on the 
>>> argument that ietf-routing is not yet implemented.
>>>
>>> Which solutions do we have from here?
>>> #1. We keep the same module name and express that the YANG module in 
>>> draft-wu-l3sm-rfc8049bis is not backward compatible with the RFC8049 
>>> one. This is the openconfig way. See 
>>> draft-clacla-netmod-model-catalog (and 
>>> draft-openconfig-netmod-model-catalog before)
>>>
>>>        // extension statements
>>>           extension openconfig-version {
>>>             argument "semver" {
>>>               yin-element false;
>>>             }
>>>             description
>>>               "The OpenConfig version number for the module. This is
>>>               expressed as a semantic version number of the form:
>>>                 x.y.z
>>>                where:
>>>                 * x corresponds to the major version,
>>>                 * y corresponds to a minor version,
>>>                 * z corresponds to a patch version.
>>>               This version corresponds to the model file within which it is
>>>               defined, and does not cover the whole set of OpenConfig models.
>>>               Where several modules are used to build up a single block of
>>>               functionality, the same module version is specified across each
>>>               file that makes up the module.
>>>
>>>               A major version number of 0 indicates that this model is still
>>>               in development (whether within OpenConfig or with industry
>>>               partners), and is potentially subject to change.
>>>
>>>               Following a release of major version 1, all modules will
>>>               increment major revision number where backwards incompatible
>>>               changes to the model are made.
>>>
>>>               The minor version is changed when features are added to the
>>>               model that do not impact current clients use of the model.
>>>
>>>               The patch-level version is incremented when non-feature changes
>>>               (such as bugfixes or clarifications to human-readable
>>>               descriptions that do not impact model functionality) are made
>>>               that maintain backwards compatibility.
>>>
>>>               The version number is stored in the module meta-data.";
>>>           }
>>>
>>> Similarly, we always keep the same YANG module name in case of NMDA 
>>> transition. So ietf-routing-2 should be changed back to ietf-routing.
>>> The email thread "[Rtg-dt-yang-arch] ietf-routing or ietf-routing-2? 
>>> module naming convention for NMDA transition. Re: [netmod] upcoming 
>>> adoptions" seems to go in that direction.
>>>
>>> #2. Or we have a different module name, let's say ietf-l3vpn-svc-2 
>>> or ietf-routing-2 but then, how do we make the link with the 
>>> previous module?
>>> Then ...  What? We create extension that will link the 
>>> draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG module? 
>>> Same principle as #1, but just more complex.
>>> Or we have a new YANG keyword (this implies YANG 2.0)
>>>
>>>     <CODE BEGINS>file"ietf-l3vpn-svc@2017-09-14.yang"
>>>     module ietf-l3vpn-svc-2 {
>>>       yang-version 1.1;
>>>       namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
>>>       prefix l3vpn-svc;
>>>       *_obsolete|update _*ietf-l3vpn-svc@2017-01-2
>>>
>>> And whose responsibility is this to warn/push all authors of 
>>> ietf-routing YANG modules to move to ietf-routing-2? (*)
>>>
>>> The following are non solution IMO:
>>> - Going from the draft-wu-l3sm-rfc8049bis YANG _module _to the 
>>> draft-wu-l3sm-rfc8049bis _document _to lookup the IETF "obsolete" 
>>> flag in order to understand that the RFC8049 YANG module is obsolete 
>>> is not an automatic solution.
>>> - Using the yangcatalog.org might be a solution as we track the 
>>> derived semantic, but this is just an offline trick. This is not 
>>> what I call "automatic way"
>>> - Using the YANG module description field might be interesting, but 
>>> again this is not an "automatic way":
>>>
>>>       description
>>>        "This YANG module defines a generic service configuration
>>>         model for Layer 3 VPNs. This model is common across all
>>>         vendor implementations. This obsoletes the RFC8049 YANG
>>>         module, ietf-l3vpn-svc@2017-01-2";
>>>       revision 2017-09-14 {
>>>        description
>>>        
>>>     "First revision ofRFC8049 <https://tools.ietf.org/html/rfc8049>.";
>>>        reference
>>>         "RFC xxxx: YANG Data Model for L3VPN Service Delivery";
>>>
>>>
>>> In conclusion, I believe openconfig got this right and that solution 
>>> #1 is the solution to go ... while waiting for a new YANG keyword in 
>>> YANG 2.0
>>>
>>> (*) If you want to change the module from ietf-routing to 
>>> ietf-routing-2, then you should follow with all authors of dependent 
>>> modules to make sure they transition to ietf-routing-2
>>> In the yangcatalog.org, because I needed the information as OPS AD, 
>>> we created a small script to get that authors list for IETF drafts. 
>>> For the ietf-routing, this produces the following
>>> {
>>>     "output": {
>>>         "author-email": [
>>> "draft-ietf-mpls-static-yang@ietf.org",
>>> "draft-ietf-mpls-base-yang@ietf.org",
>>> "draft-ietf-ospf-sr-yang@ietf.org",
>>> "draft-ietf-pim-yang@ietf.org",
>>> "draft-ietf-bier-bier-yang@ietf.org",
>>> "draft-zhang-bier-te-yang@ietf.org",
>>> "draft-ietf-isis-yang-isis-cfg@ietf.org",
>>> "draft-ietf-teas-yang-rsvp-te@ietf.org",
>>> "draft-ietf-mpls-mldp-yang@ietf.org",
>>> "draft-zhao-pim-igmp-mld-snooping-yang@ietf.org",
>>> "draft-ietf-isis-sr-yang@ietf.org",
>>> "draft-acee-rtgwg-yang-rib-extend@ietf.org",
>>> "draft-ietf-pim-igmp-mld-yang@ietf.org",
>>> "draft-ietf-i2rs-fb-rib-data-model@ietf.org",
>>> "draft-ietf-ospf-yang@ietf.org",
>>> "draft-ietf-rtgwg-yang-rip@ietf.org",
>>> "draft-ietf-spring-sr-yang@ietf.org",
>>> "draft-ietf-teas-yang-rsvp@ietf.org",
>>> "draft-ietf-i2rs-pkt-eca-data-model@ietf.org",
>>> "draft-ietf-mpls-ldp-yang@ietf.org",
>>> "draft-ietf-bfd-yang@ietf.org",
>>> "draft-ietf-pim-msdp-yang@ietf.org"
>>>         ]
>>>     }
>>> }
>>>
>>> Fortunately, we only deal with IETF dependent YANG modules in case 
>>> of the ietf-routing. That's an easier case.
>>> If we would change ietf-interfaces to ietf-interfaces-2, we would 
>>> have an cross SDO issue ... Btw, there are no automatic ways to 
>>> extract the authors of YANG modules from different SDOs: it's only a 
>>> metadata that that the different SDOs should insert in the 
>>> yangcatalog. So we would have to rely on liaisons or direct emails, 
>>> assuming we know the authors. Time consuming, believe me.
>>>
>>> Regards, Benoit
>>>> Hi,
>>>>
>>>>      As part of the my Routing Directorate review of
>>>> draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
>>>> changes being made to the ietf-l3vpn-svc module without changing the
>>>> name.  I raised this with the YANG doctors and others involved with the
>>>> draft and it surfaced some topics which really should be discussed here
>>>> in NetMod.
>>>>
>>>> The background (as explained off-list by others, so I hope I have it
>>>> right)  is that one of the YANG Doctors noted that RFC8049 was broken
>>>> and could not be implemented as defined, and therefore a fix was
>>>> needed.  L3SM has concluded so the fix is in the individual draft
>>>> draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
>>>> module could not be implemented, the feeling by the YANG Dr was that
>>>> even though the new module is incompatible with the original definition
>>>> the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
>>>> RFC 6020) didn't have to be followed and the same name could be used.
>>>>
>>>> In the subsequent discussion with the YANG Drs., the general discussion
>>>> was heading down the path of using a new module name, and thereby not
>>>> violating YANG module update rules.  This lead us back to the a similar
>>>> discussion we've been having in the context of 8022bis: how best to
>>>> indicate that a whole module is being obsoleted.  RFCs do this by adding
>>>> 'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
>>>> help YANG tooling.  For 8022, we have one approach - publishing an
>>>> updated rev of the original module marking all nodes as deprecated - but
>>>> that doesn't really make sense for rfc8049bis.
>>>>
>>>> So the discussion for the WG is:
>>>>
>>>> How do we handle incompatible module changes, notably when one module
>>>> 'obsoletes' another module --  from both the process and tooling
>>>> perspectives?
>>>>
>>>> I know Benoit plans to bring in some thoughts/proposals, perhaps there
>>>> are others.
>>>>
>>>> Cheers,
>>>>
>>>> Lou
>>>>
>>>> (as contributor/reviewer)
>>>>
>>>>
>>>>
>>>>
>


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    <div class="moz-cite-prefix">On 10/12/2017 3:30 PM, Benoit Claise
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:708ad6ca-e37b-6236-59b2-80c611b132ae@cisco.com">
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <div class="moz-cite-prefix">Hi Lou,<br>
      </div>
      <blockquote type="cite"
        cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
        <div style="color: black;">
          <div style="color: black;">
            <p style="margin: 0 0 1em 0; color: black;">So circling back
              to the original question: what do we do about the non
              backward-compatible module being defined in rfc8049bis?</p>
            <p style="margin: 0 0 1em 0; color: black;">While being
              sympathetic to many of the comments made below as well as
              the "do over" concept, I find the comments about adhering
              to the rules of 7950 compelling - which leads to renaming
              the module in the bis to ietf-l3vpn-svc-2.</p>
            <p style="margin: 0 0 1em 0; color: black;">It would be good
              to ensure that this is the consensus of the group before
              asking the authors make this change.</p>
          </div>
        </div>
      </blockquote>
      Since this draft is AD sponsored, I'll evaluate the consensus on
      RFC8049bis.<br>
      Moving to ietf-l3vpn-svc-2 is the easy path not to break backward
      compatibility. However, since ietf-l3vpn-svc is unimplementable
      (it has broken XPATH expressions, so a compliant implementation is
      impossible), so technically, ietf-l3vpn-svc does not even exist. <br>
    </blockquote>
    See my message on this topic, as the IETF LC follow up.<br>
       
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mail-archive/web/ietf-announce/current/maillist.html">https://www.ietf.org/mail-archive/web/ietf-announce/current/maillist.html</a><br>
    If a follow up is required, I propose that we use a single public
    email thread: the <a class="moz-txt-link-abbreviated"
      href="mailto:ietf@ietf.org">ietf@ietf.org</a><br>
    <br>
    Regards, Benoit<br>
    <blockquote type="cite"
      cite="mid:708ad6ca-e37b-6236-59b2-80c611b132ae@cisco.com"> <br>
      What NETMOD should focus on is closing on the NMDA transition: the
      ietf-routing versus ietf-routing-2 issue. <br>
      Way bigger impact in terms of dependent YANG modules<br>
      <br>
      Regards, Benoit (as OPS AD)<br>
      See below.<br>
      <blockquote type="cite"
        cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
        <div style="color: black;">
          <div style="color: black;">
            <p style="margin: 0 0 1em 0; color: black;">This change
              course doesn't solve the versioning issue discussed below,
              but this is not a new issue it's just the first time we'll
              actually executing the steps envisioned as part of the
              rules laid out in yang. My personal take away is that
              means that we should immediately start work on an
              extension defining along the lines of  ' <b><u>obsolete|update</u></b>'
              mentioned below.</p>
          </div>
        </div>
      </blockquote>
      I believe that option 1 is the more pragmatic and complete
      solution. option 2 is just half a step in the right direction. <br>
      I believe we should discuss this topic in Singapore.<br>
      <br>
      Regards, Benoit (as individual contributor)<br>
      <blockquote type="cite"
        cite="mid:15f105bf980.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net">
        <div style="color: black;">
          <div style="color: black;">
            <p style="margin: 0 0 1em 0; color: black;">Lou<br>
            </p>
          </div>
          <div style="color: black;">
            <p style="color: black; font-size: 10pt; font-family: Arial,
              sans-serif; margin: 10pt 0;">On October 8, 2017 10:59:15
              AM Benoit Claise <a class="moz-txt-link-rfc2396E"
                href="mailto:bclaise@cisco.com" moz-do-not-send="true">&lt;bclaise@cisco.com&gt;</a>
              wrote:</p>
            <blockquote type="cite" class="gmail_quote" style="margin: 0
              0 0 0.75ex; border-left: 1px solid #808080; padding-left:
              0.75ex;">
              <div class="moz-cite-prefix">Dear all,<br>
                <br>
                Focusing on draft-wu-l3sm-rfc8049bis, the big problem
                is: RFC8049 is broken. The small problem is: trying to
                maintain backward compatibility.<br>
                draft-wu-l3sm-rfc8049bis has rightly focused on the big
                problem.<br>
                <br>
                Let me extend the scope of this email thread from
                "handling module incompatibility" to "handling module
                incompatibility and NMDA transition".<br>
                As I mentioned in the past (see "semver.org comparison
                of two YANG modules" email in NETMOD), I believe the
                IETF will have to change its way of working in terms of
                backward compatibility. See also the email "ietf-routing
                or ietf-routing-2? module naming convention for NMDA
                transition. Re: [netmod] upcoming adoptions" in NETMOD.
                <br>
                <br>
                However, we will have to tackle this discussion one day
                or the other: <br>
                - we need <u>an automatic way</u> to make the link
                between the YANG module in RFC8049 and the YANG module
                in draft-wu-l3sm-rfc8049bis, or any non backward
                compatible YANG modules.<br>
                - we need <u>an automatic way</u> to make the link
                between the YANG module in RFC8022 and the YANG module
                in draft-acee-netmod-rfc8022bis, or any new YANG module
                names used for NMDA transition.<br>
                Note: actually, we face two different problems.
                draft-wu-l3sm-rfc8049bis might be declared backward
                incompatible with RFC8049, while RFC8022bis is backward
                compatible with RFC8022. The RFC8022bis went for a new
                YANG module name ietf-routing-2 to avoid to document the
                -state tree (as deprecated), based on the argument that
                ietf-routing is not yet implemented.<br>
                <br>
                Which solutions do we have from here? <br>
                #1. We keep the same module name and express that the
                YANG module in draft-wu-l3sm-rfc8049bis is not backward
                compatible with the RFC8049 one. This is the openconfig
                way. See draft-clacla-netmod-model-catalog (and
                draft-openconfig-netmod-model-catalog before)<small><br>
                </small>
                <blockquote>
                  <pre>  // extension statements
     extension openconfig-version {
       argument "semver" {
         yin-element false;
       }
       description
         "The OpenConfig version number for the module. This is
         expressed as a semantic version number of the form:
           x.y.z
          where:
           * x corresponds to the major version,
           * y corresponds to a minor version,
           * z corresponds to a patch version.
         This version corresponds to the model file within which it is
         defined, and does not cover the whole set of OpenConfig models.
         Where several modules are used to build up a single block of
         functionality, the same module version is specified across each
         file that makes up the module.

         A major version number of 0 indicates that this model is still
         in development (whether within OpenConfig or with industry
         partners), and is potentially subject to change.

         Following a release of major version 1, all modules will
         increment major revision number where backwards incompatible
         changes to the model are made.

         The minor version is changed when features are added to the
         model that do not impact current clients use of the model.

         The patch-level version is incremented when non-feature changes
         (such as bugfixes or clarifications to human-readable
         descriptions that do not impact model functionality) are made
         that maintain backwards compatibility.

         The version number is stored in the module meta-data.";
     }</pre>
                </blockquote>
                Similarly, we always keep the same YANG module name in
                case of NMDA transition. So ietf-routing-2 should be
                changed back to ietf-routing.<br>
                The email thread "[Rtg-dt-yang-arch] ietf-routing or
                ietf-routing-2? module naming convention for NMDA
                transition. Re: [netmod] upcoming adoptions" seems to go
                in that direction.<br>
                <br>
                #2. Or we have a different module name, let's say
                ietf-l3vpn-svc-2 or ietf-routing-2 but then, how do we
                make the link with the previous module? <br>
                Then ...  What? We create extension that will link the
                draft-wu-l3sm-rfc8049bis YANG module to the RFC8049 YANG
                module? Same principle as #1, but just more complex. <br>
                Or we have a new YANG keyword (this implies YANG 2.0)<br>
                <blockquote>
                  <pre class="newpage">&lt;CODE BEGINS&gt;file <a class="moz-txt-link-rfc2396E" href="mailto:ietf-l3vpn-svc@2017-09-14.yang" moz-do-not-send="true">"ietf-l3vpn-svc@2017-09-14.yang"</a>
module ietf-l3vpn-svc-2 {
 yang-version 1.1;
 namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";
 prefix l3vpn-svc;
 <b><u>obsolete|update </u></b>ietf-l3vpn-svc@2017-01-2
</pre>
                </blockquote>
                And whose responsibility is this to warn/push all
                authors of ietf-routing YANG modules to move to
                ietf-routing-2? (*)<br>
                <br>
                The following are non solution IMO:<br>
                - Going from the draft-wu-l3sm-rfc8049bis YANG <u>module
                </u>to the draft-wu-l3sm-rfc8049bis <u>document </u>to
                lookup the IETF "obsolete" flag in order to understand
                that the RFC8049 YANG module is obsolete is not an
                automatic solution.<br>
                - Using the yangcatalog.org might be a solution as we
                track the derived semantic, but this is just an offline
                trick. This is not what I call "automatic way"<br>
                - Using the YANG module description field might be
                interesting, but again this is not an "automatic way":<br>
                <blockquote>
                  <pre class="newpage"> description
  "This YANG module defines a generic service configuration
   model for Layer 3 VPNs. This model is common across all
   vendor implementations. This obsoletes the RFC8049 YANG 
   module, ietf-l3vpn-svc@2017-01-2";
 revision 2017-09-14 {
  description
  
"First revision of <a href="https://tools.ietf.org/html/rfc8049" moz-do-not-send="true">RFC8049</a>.";
  reference
   "RFC xxxx: YANG Data Model for L3VPN Service Delivery";</pre>
                </blockquote>
                <br>
                In conclusion, I believe openconfig got this right and
                that solution #1 is the solution to go ... while waiting
                for a new YANG keyword in YANG 2.0<br>
                <br>
                (*) If you want to change the module from ietf-routing
                to ietf-routing-2, then you should follow with all
                authors of dependent modules to make sure they
                transition to ietf-routing-2<br>
                In the yangcatalog.org, because I needed the information
                as OPS AD, we created a small script to get that authors
                list for IETF drafts. For the ietf-routing, this
                produces the following<br>
                {<br>
                    "output": {<br>
                        "author-email": [<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-mpls-static-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-mpls-static-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-mpls-base-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-mpls-base-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-ospf-sr-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-ospf-sr-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-pim-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-pim-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-bier-bier-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-bier-bier-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-zhang-bier-te-yang@ietf.org"
                  moz-do-not-send="true">"draft-zhang-bier-te-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-isis-yang-isis-cfg@ietf.org"
                  moz-do-not-send="true">"draft-ietf-isis-yang-isis-cfg@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-teas-yang-rsvp-te@ietf.org"
                  moz-do-not-send="true">"draft-ietf-teas-yang-rsvp-te@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-mpls-mldp-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-mpls-mldp-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"
                  moz-do-not-send="true">"draft-zhao-pim-igmp-mld-snooping-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-isis-sr-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-isis-sr-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-acee-rtgwg-yang-rib-extend@ietf.org"
                  moz-do-not-send="true">"draft-acee-rtgwg-yang-rib-extend@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-pim-igmp-mld-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-pim-igmp-mld-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-i2rs-fb-rib-data-model@ietf.org"
                  moz-do-not-send="true">"draft-ietf-i2rs-fb-rib-data-model@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-ospf-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-ospf-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-rtgwg-yang-rip@ietf.org"
                  moz-do-not-send="true">"draft-ietf-rtgwg-yang-rip@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-spring-sr-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-spring-sr-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-teas-yang-rsvp@ietf.org"
                  moz-do-not-send="true">"draft-ietf-teas-yang-rsvp@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-i2rs-pkt-eca-data-model@ietf.org"
                  moz-do-not-send="true">"draft-ietf-i2rs-pkt-eca-data-model@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-mpls-ldp-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-mpls-ldp-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-bfd-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-bfd-yang@ietf.org"</a>,<br>
                            <a class="moz-txt-link-rfc2396E"
                  href="mailto:draft-ietf-pim-msdp-yang@ietf.org"
                  moz-do-not-send="true">"draft-ietf-pim-msdp-yang@ietf.org"</a><br>
                        ]<br>
                    }<br>
                }<br>
                <br>
                Fortunately, we only deal with IETF dependent YANG
                modules in case of the ietf-routing. That's an easier
                case.<br>
                If we would change ietf-interfaces to ietf-interfaces-2,
                we would have an cross SDO issue ... Btw, there are no
                automatic ways to extract the authors of YANG modules
                from different SDOs: it's only a metadata that that the
                different SDOs should insert in the yangcatalog. So we
                would have to rely on liaisons or direct emails,
                assuming we know the authors. Time consuming, believe
                me.<br>
                <br>
                Regards, Benoit<br>
              </div>
              <blockquote type="cite"
                cite="mid:caa884d9-9d71-e7ad-cffd-427b58750c58@labn.net">
                <pre wrap="">Hi,

    As part of the my Routing Directorate review of
draft-wu-l3sm-rfc8049bis I noted that there were several incompatible
changes being made to the ietf-l3vpn-svc module without changing the
name.  I raised this with the YANG doctors and others involved with the
draft and it surfaced some topics which really should be discussed here
in NetMod.

The background (as explained off-list by others, so I hope I have it
right)  is that one of the YANG Doctors noted that RFC8049 was broken
and could not be implemented as defined, and therefore a fix was
needed.  L3SM has concluded so the fix is in the individual draft
draft-wu-l3sm-rfc8049bis.  Since the rfc8049 version of ietf-l3vpn-svc
module could not be implemented, the feeling by the YANG Dr was that
even though the new module is incompatible with the original definition
the module the rule defined in Section 11 of YANG 1.1 (or section 10 of
RFC 6020) didn't have to be followed and the same name could be used.

In the subsequent discussion with the YANG Drs., the general discussion
was heading down the path of using a new module name, and thereby not
violating YANG module update rules.  This lead us back to the a similar
discussion we've been having in the context of 8022bis: how best to
indicate that a whole module is being obsoleted.  RFCs do this by adding
'metadata' to the headers, e.g., "Obsoletes: 8049", but this doesn't
help YANG tooling.  For 8022, we have one approach - publishing an
updated rev of the original module marking all nodes as deprecated - but
that doesn't really make sense for rfc8049bis.

So the discussion for the WG is:

How do we handle incompatible module changes, notably when one module
'obsoletes' another module --  from both the process and tooling
perspectives?

I know Benoit plans to bring in some thoughts/proposals, perhaps there
are others.

Cheers,

Lou

(as contributor/reviewer)




</pre>
              </blockquote>
            </blockquote>
          </div>
        </div>
      </blockquote>
      <br>
    </blockquote>
    <br>
  </body>
</html>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/MX3yMgobdsVnrCixXKn9Gi8Phz0>
Subject: [RTG-DIR] RtgDir review: draft-ietf-anima-prefix-management-05
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Hello,

I have been selected as the Routing Directorate reviewer for this draft. =
The
Routing Directorate seeks to review all routing or routing-related =
drafts as
they pass through IETF last call and IESG review, and sometimes on =
special
request. The purpose of the review is to provide assistance to the =
Routing
ADs. For more information about the Routing Directorate, please see
=E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF =
Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-name-version.txt=20
Reviewer: your-name=20
Review Date: date=20
IETF LC End Date: date-if-known=20
Intended Status: copy-from-I-D

Summary:=20

  I have some minor concerns about this document that I think should be
  resolved before publication

Comments:

  This document describes an "autonomic solution for IPv6 prefix
  management at the edge of large-scale ISP networks".

  The document contains a description of a mechanism to request and =
receive
  an IPv6 prefix, which is just one part of an overall process of =
address
  management in a network. The document could benefit from some
  considerations of the interplay between this address assignment =
mechanism
  and the routing system used within the network. The document also does =
not
  explicitly address issues of address prefix reuse, and the relative
  advantages and disadvantages between an address management mechanism =
that
  attempts to define a long lived association between a device a =
particular
  address prefix, and a dynamic pool management system that admits for =
high
  levels of prefix reuse. The document also does not define the intended =
scope=20
  applicability - for example is this mechanism intended to operate =
across
  network administrative boundaries? If not, how are such adminis =
boundaries
  defined?

  This is intended for publication as an informational document, so =
there is
  no requirement to meet strict standards of precision and clarity. That
  said, there are areas where the language is speculative and vague, and
  some assertions are clearly untested (and somewhat dubious in the way =
in
  which they are stated).


Comments on quality and readability.

  I don't believe that the document clearly achieves what it intended to
  achieve.

  The document describes a problem space, and then jumps immediately =
into a
  way to define an ANIMA scheme that could be set up to perform a prefix
  assignment function. It would help in an informational document to =
provide
  a bridge between problem and solution specifics, namely a design =
overview
  of they overall approach being described in this document.
 =20
  Other reviews have noted editorial nits - no point in repeating that =
work
  here.
 =20


From nobody Mon Oct 16 18:15:54 2017
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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-spring-lsp-ping.authors@ietf.org" <draft-ietf-mpls-spring-lsp-ping.authors@ietf.org>, "BRUNGARD, DEBORAH A" <db3546@att.com>
Thread-Topic: draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
Thread-Index: AdM87VBWMwQpWk20SYuuvpBxKKubvgD/JaaAASd6g7AAWX4xgA==
Date: Tue, 17 Oct 2017 01:15:25 +0000
Message-ID: <4E95B90B-43FD-4DC6-A052-19B0C00A866D@cisco.com>
References: <AM4PR03MB1713BACBB06A4157DFE2F3889D730@AM4PR03MB1713.eurprd03.prod.outlook.com> <34333AE3-B0F1-43C3-A9DE-2BB3AAD7E7BA@cisco.com> <AM4PR03MB171301482FC7A31B2C92728A9D4E0@AM4PR03MB1713.eurprd03.prod.outlook.com>
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To: Geoff Huston <gih@apnic.net>, rtg-ads@ietf.org
Cc: rtg-dir@ietf.org, draft-ietf-anima-prefix-management.all@ietf.org, anima@ietf.org
References: <7EFC323E-9ECE-4543-8A54-88FBB69D2733@apnic.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 17 Oct 2017 16:52:12 +1300
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/xrFKEpkRbnlqRHocP3ckMojuFUE>
Subject: Re: [RTG-DIR] RtgDir review: draft-ietf-anima-prefix-management-05
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Thanks Geoff. Some responses in line below.

On 17/10/2017 13:55, Geoff Huston wrote:
> Hello,
>=20
> I have been selected as the Routing Directorate reviewer for this draft=
=2E The
> Routing Directorate seeks to review all routing or routing-related draf=
ts as
> they pass through IETF last call and IESG review, and sometimes on spec=
ial
> request. The purpose of the review is to provide assistance to the Rout=
ing
> ADs. For more information about the Routing Directorate, please see
> =E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>=20
> Although these comments are primarily for the use of the Routing ADs, i=
t
> would be helpful if you could consider them along with any other IETF L=
ast
> Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>=20
> Document: draft-name-version.txt=20
> Reviewer: your-name=20
> Review Date: date=20
> IETF LC End Date: date-if-known=20
> Intended Status: copy-from-I-D
>=20
> Summary:=20
>=20
>   I have some minor concerns about this document that I think should be=

>   resolved before publication
>=20
> Comments:
>=20
>   This document describes an "autonomic solution for IPv6 prefix
>   management at the edge of large-scale ISP networks".
>=20
>   The document contains a description of a mechanism to request and rec=
eive
>   an IPv6 prefix, which is just one part of an overall process of addre=
ss
>   management in a network. The document could benefit from some
>   considerations of the interplay between this address assignment mecha=
nism
>   and the routing system used within the network. The document also doe=
s not
>   explicitly address issues of address prefix reuse, and the relative
>   advantages and disadvantages between an address management mechanism =
that
>   attempts to define a long lived association between a device a partic=
ular
>   address prefix, and a dynamic pool management system that admits for =
high
>   levels of prefix reuse. The document also does not define the intende=
d scope=20
>   applicability - for example is this mechanism intended to operate acr=
oss
>   network administrative boundaries? If not, how are such adminis bound=
aries
>   defined?

OK, fair enough. Although the scope of ANIMA in general is within a singl=
e
admin boundary, we probably need to restate it here.

>   This is intended for publication as an informational document, so the=
re is
>   no requirement to meet strict standards of precision and clarity. Tha=
t
>   said, there are areas where the language is speculative and vague, an=
d
>   some assertions are clearly untested (and somewhat dubious in the way=
 in
>   which they are stated).

There will be quite a few wording improvements following other reviews,
so I hope that will take care of most of this issue.

> Comments on quality and readability.
>=20
>   I don't believe that the document clearly achieves what it intended t=
o
>   achieve.
>=20
>   The document describes a problem space, and then jumps immediately in=
to a
>   way to define an ANIMA scheme that could be set up to perform a prefi=
x
>   assignment function. It would help in an informational document to pr=
ovide
>   a bridge between problem and solution specifics, namely a design over=
view
>   of they overall approach being described in this document.

I think we can do that in not too many words.=20
>   Other reviews have noted editorial nits - no point in repeating that =
work
>   here.

Thanks
    Brian


From nobody Tue Oct 17 00:21:45 2017
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-spring-lsp-ping.authors@ietf.org" <draft-ietf-mpls-spring-lsp-ping.authors@ietf.org>, "BRUNGARD, DEBORAH A" <db3546@att.com>, Antoni Przygienda <prz@juniper.net>
Thread-Topic: draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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Subject: Re: [RTG-DIR] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-spring-lsp-ping.authors@ietf.org" <draft-ietf-mpls-spring-lsp-ping.authors@ietf.org>, "BRUNGARD, DEBORAH A" <db3546@att.com>, Antoni Przygienda <prz@juniper.net>
Thread-Topic: draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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Date: Tue, 17 Oct 2017 07:23:48 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/OLhq7OC7kjyQQhJlsJOfh9Xlm_U>
Subject: Re: [RTG-DIR] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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From: John E Drake <jdrake@juniper.net>
To: "rtg-ads@ietf.org" <rtg-ads@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-tcpinc-tcpcrypt.all@ietf.org" <draft-ietf-tcpinc-tcpcrypt.all@ietf.org>, "tcpinc@ietf.org" <tcpinc@ietf.org>
CC: Alvaro Retana <aretana.ietf@gmail.com>, Jonathan Hardwick <jonathan.hardwick@metaswitch.com>, "Yemin (Amy)" <amy.yemin@huawei.com>
Thread-Topic: rtgdir Telechat Review requested: draft-ietf-tcpinc-tcpcrypt-07
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/5TSkYec-gx6NDgbo6Gr7S0wiPcw>
Subject: Re: [RTG-DIR] rtgdir Telechat Review requested: draft-ietf-tcpinc-tcpcrypt-07
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From nobody Thu Oct 26 18:22:10 2017
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From: Min Ye <amy.yemin@huawei.com>
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Cc: sidrops@ietf.org, draft-ietf-sidrops-bgpsec-rollover.all@ietf.org, ietf@ietf.org
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Subject: [RTG-DIR] Rtgdir last call review of draft-ietf-sidrops-bgpsec-rollover-02
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Reviewer: Daniele Ceccarelli
Review result: Has Issues

Resend as the mail is not archived by the list

Hello,

I have been selected as the Routing Directorate reviewer for this draft. The
Routing Directorate seeks to review all routing or routing-related drafts as
they pass through IETF last call and IESG review, and sometimes on special
request. The purpose of the review is to provide assistance to the Routing ADs.
For more information about the Routing Directorate, please see
http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it would
be helpful if you could consider them along with any other IETF Last Call
comments that you receive, and strive to resolve them through discussion or by
updating the draft.

Document: draft-ietf-sidrops-bgpsec-rollover-02
Reviewer: Daniele Ceccarelli
Review Date: 25/10/2017
IETF LC End Date: On agenda of 2017-11-30 IESG telechat Intended Status:
Standard Track

Summary:

I have some minor concerns about this document that I think should be resolved
before publication.

Comments:

The draft is sometimes hard to read, mostly the abstract (which should be clear
on the scope of the draft), what is being defined and above all the intended
status. In some parts the draft seems to be a recommendation, in some others a
standard track. Which one?

Major Issues:
- None

Minor Issues  and nits:
- The abstract is a bit hard to read. E.g. the usage of "will also manage"
might become obsolete sooner or later and this sentence "But the rollover
   of CA and EE certificates BGPsec router certificates have..." doesn't make
   much sense. -
- Moreover the abstract says: "This document provides general recommendations
for the rollover process". How can it be a standard track then? - Intro:
"Additionally, the BGP speaker MUST refresh its outbound BGPsec Update messages
to include a signature using the new  key (replacing the old key)." I wouldn't
expect a MUST in the intro. I understand this is something defined in other
documents, hence should not be in capital letters and probably added a
reference. - Section 3 ditto. "A BGPsec router certificate SHOULD be replaced
when the following events occur" is this something new defined in this
document? - Typo/Punctuation/wrong usage of capital letters: there is a number
of them all over the document. Why OLD key is always used with old in capital
letters?

Thanks
Daniele



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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Thu, 26 Oct 2017 22:29:53 -0400
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Subject: Re: [RTG-DIR] [trill] RtgDir review: draft-ietf-trill-directory-assisted-encap-02
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Hi Ben,

Thanks for your review. It appears that is was not responded to in a
timely fashion. Apologies on behalf of the authors.

(Your review was of the -02 version. The current version is -05.)

On Sun, Apr 24, 2016 at 4:28 AM, Ben Niven-Jenkins
<ben@niven-jenkins.co.uk> wrote:
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this
> draft. The Routing Directorate seeks to review all routing or
> routing-related drafts as they pass through IETF last call and IESG
> review. The purpose of the review is to provide assistance to the
> Routing ADs. For more information about the Routing Directorate,
> please see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
> Although these comments are primarily for the use of the Routing
> ADs, it would be helpful if you could consider them along with any
> other IETF Last Call comments that you receive, and strive to
> resolve them through discussion or by updating the draft.
>
>
> Document: draft-ietf-trill-directory-assisted-encap-02.txt
> Reviewer: Ben Niven-Jenkins
> Review Date: 21 April 2016
> Intended Status: Proposed Standard
>
> Summary:
> I have significant concerns about this document and recommend that
> the Routing ADs discuss these issues further with the authors.

Hopefully the changes made between the version -02 you reviewed and
the current -05 have made some improvements and, based on your
comments and WG LC comments, further improvements can be made.

> Comments:
> Overall this is not the easiest document to read although some of
> that might be due to my lack of background in TRILL and its
> terminology.
>
> Major Issues:
>
> 1) The document has an Intended Status of Proposed Standard, however
> it does not contain any RFC2119 keywords and does not seem to make
> any normative statements about required behaviour which I would have
> expected in a Proposed Standard.

Well, in version -05 there is at least one keyword instance.
Furthermore, I don't know that such keywords need to always be used
when an implementation requirement level is being specified. That
said, we could see if additional RFC 2119 keywords are warranted.

> 2) Section 4: If I understand correctly the TRILL-EN spoofs the
> Ingress RBridge edge node's nickname in the source address field of
> the TRILL header. Is this likely to introduce problems? E.g. if
> RBridges will accept & forward frames that have their own source
> address in, does it perpetuate routing loops or present security
> considerations that the document should discuss?

TRILL goes to great lengths to avoid loops and has a hop count in the
TRILL header so that, should there be a transient loop, a TRILL packet
in that loop (i.e., an encapsulated frame) will be discarded. In the
potentially more dangerous case of multi-destination packets, as
compared with known unicast, where copies could multiply due to forks
in the distribution tree, a Reverse Path Forwarding Check is used to
discard packets that appear to be on the wrong link or when there is
disagreement about the distribution tree.

Security Considerations should probably say more on this.

> Section 8 on Security Considerations also looks very light on
> text. If you are allowing TRILL-ENs to spoof RBridge source
> addresses (which I think you are, see comment above) I think you
> should have a discussion about that somewhere in the document.

I agree that some further discussion is needed in the Security
Considerations section.

> Minor Issues:
>
> 1) Section 3. I am not sure what Figure 2 is trying to convey and it
> is not referred to by the main text. Is it required?

Figure 2 is intended to show the header of a pre-encapsulated frame
going from a TRILL-EN to an edge TRILL switch. If it is retained in
the draft, there should be clarifying text that references it.

> 2) Section 3 says:
>
>    Editor's note: [Directory] has defined Push and Pull methods for edge
>    RBridges to get directory mapping information. The Pull Model is
>    relative simple for TRILL-EN to implement (see Section 9). Pushing
>    Directory information requires some reliable flooding mechanism, like
>    the one used by IS-IS, between the edge RBridge and the TRILL
>    encapsulating node.
>
> which gives me the impression the authors prefer pull and discourage
> push as it would require something extra like IS-IS.

That note no longer exists in the draft. Also the "[Directory]" draft
referred to has been issued as RFC 8171 and the draft should be
updated to reflect that.

> However, Section 4 says
>
>    The TRILL-EN learns this nickname by listening
>    to the TRILL IS-IS Hellos from the Ingress RBridge.
>
> which makes me think if the TRILL-EN is running IS-IS for hellos, is
> pushing the directory such an obstacle?

That text refers to snooping on IS-IS messages, not running IS-IS.

There are problems with using IS-IS, designed for communication
between routers (Intermediate Systems) and the end station
implementing pre-encapsulation as described in this draft.  At first
throught, you might want is an extension of ES-IS but the Memorandum
of Understanding between the IETF and ISO/IEC only covers IS-IS, not
ES-IS. So TRILL has specified a "TRILL ES-IS" in Section 5 of RFC
8171. However, even then, push uses ESADI [RFC7357], which involves
encapsulation and VLAN/FGL scoping and which would need to be extended
for end stations so push is out of scope for this document.

> Is whether the directory is pulled or pushed something this document
> needs to discuss at all? If it does need to discuss push vs pull,
> should the document be stronger and make a clearer recommendation on
> which method should be used (or implemented by default) to aid with
> interoperability?

The reasons for using push or pull or some sort of hybrid are
discussed in RFC 8171. The -05 version of the Directory Assisted TRILL
Encapsulation document only covers pull.

> 3) Section 5.1 states
>
>    setting TRILL boundary at aggregation
>    switches that have many virtualized servers attached can limit the
>    number of RBridge nodes in a TRILL domain, but introduce the issues
>    of very large MAC&VLAN<->RBridgeEdge mapping table to be maintained
>    by RBridge edge nodes and the necessity of enforcing AF ports.
>
>    Allowing Non-RBridge nodes to pre-encapsulate data frames with TRILL
>    header makes it possible to have a TRILL domain with a reasonable
>    number of RBridge nodes in a large data center. All the TRILL-ENs
>    attached to one RBridge are represented by one TRILL nickname, which
>    can avoid the Nickname exhaustion problem.
>
> As I understand it TRILL-ENs pre-encapsulate packets that they send,
> but when receiving packets the RBridge attached to the TRILL-EN
> decapsulates the TRILL packet and forwards it to the TRILL-EN
> =E2=80=9Cnatively=E2=80=9D (without TRILL encapsulation), as stated in se=
ction 3:
>
>    When a TRILL frame arrives at an RBridge whose nickname matches with
>    the destination nickname in the TRILL header of the frame, the
>    processing is exactly same as normal, i.e. as specified in [RFC6325]
>    the RBridge decapsulates the received TRILL frame and forwards the
>    decapsulated frame to the target attached to its edge ports.
>
> Therefore all the RBridges still need to maintain a very large
> "MAC&VLAN<->RBridgeEdge mapping table=E2=80=9D? If that is the case, what
> advantage does this approach give over the =E2=80=9Cbase case=E2=80=9D of=
 setting
> TRILL boundary at aggregation switches?

With pre-encapsulation, although edge RBridges need to learn local MAC
addresses so they can de-capsulate, they do not need to learn the
typically much larger number of remote MAC address because they do not
need to encapsulate. This should be explained more clearly.

> 4) Section 7 on Manageability Considerations only states that in
> order for the solution to work requires the availability of a
> directory service, which seems a bit redundant when the entire
> document is about "Directory Assisted TRILL Encapsulation=E2=80=9D. Is th=
is
> section required?

I agree that the Manageability Considerations section should have
some material added concerning configuration or be dropped.

Thanks,
Donald
=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=3D=3D=3D=3D=3D
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com

> Regards
> Ben


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Subject: Re: [RTG-DIR] RtgDir review: draft-ietf-sidrops-bgpsec-rollover-02
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From nobody Sun Oct 29 18:37:04 2017
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From: Min Ye <amy.yemin@huawei.com>
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Subject: [RTG-DIR] Rtgdir telechat review of draft-ietf-tcpinc-tcpeno-12
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Reviewer: Papadimitriou Dimitri
Review result: Has Issues

Hello

I have been selected to do a routing directorate “early” review of this draft.
https://datatracker.ietf.org/doc/draft-ietf-tcpinc-tcpeno/

As this document is in working group last call, my focus for the review was to
determine whether the document has any potential impact on routing applications
(BGP, LDP, etc.).

Document: draft-ietf-tcpinc-tcpeno-12
Reviewer: D.Papadimitriou
Review Date: 28-10-2019
Intended Status: Experimental

Summary:

I have some minor concerns about this document that I think should be resolved
before it is submitted to the IESG.

Comments:

- May be the document can document if there is any modification for what
concerns closing of connections (in its current version the document provides a
requirement in Section 5 but no actual procedure)

Nits:

- Include ref. for Section 3 on Terminology (SYN, ACK, etc.)

- Section 4 states " It uses a new TCP option kind " may be worth explaining
which *new* kind ?

- s/ 4.5.  The Negotiated Tep/ 4.5.  The Negotiated TEP

Thanks,
-dimitri.



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From: David Mazieres <dm-list-tcpcrypt@scs.stanford.edu>
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Min Ye <amy.yemin@huawei.com> writes:

> I have some minor concerns about this document that I think should be
> resolved before it is submitted to the IESG.
>
> Comments:
>
> - May be the document can document if there is any modification for
> what concerns closing of connections (in its current version the
> document provides a requirement in Section 5 but no actual procedure)

Thanks for the review and the comments.  All of your other comments
besides the above one are already slated to be fixed in the next draft.

As for closing the connection, the intent of the ENO draft is for the
actual close procedure to be delegated to the individual TEPs.  During
the working group, we saw at least two different cases depending on
whether an encryption protocol authenticates individual TCP segments
(like Joe Touch's ao-encrypt proposal and early drafts of tcpcrypt) or
it authenticates data frames that may span TCP segments (like
tcp-use-TLS and tcpcrypt in its current form).  The goal of the ENO
draft is to set minimum security requirements for all TEPs without
ruling out either approach.

Given that the tcpcrypt TEP draft does in fact specify the close
procedure, do you think it is okay to leave the ENO draft as is?  Or, as
another alternative, ENO could simply state that any TEP must clearly
specify the exact close procedure.

Thanks,
David

