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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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Subject: [spring] 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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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<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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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "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
Thread-Index: AdM87VBWMwQpWk20SYuuvpBxKKubvgD/JaaA
Date: Mon, 9 Oct 2017 09:32:27 +0000
Message-ID: <34333AE3-B0F1-43C3-A9DE-2BB3AAD7E7BA@cisco.com>
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Subject: Re: [spring] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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From: Leonid Okner <leonid.okner@broadcom.com>
Date: Mon, 9 Oct 2017 18:30:06 -0700
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Subject: [spring] MPLS Segment Routing in IP Networks
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Hello,

I would like to clarify on PHP explicit null label support in the
forwarding plane.

On segment termination node the forwarding plane can't tell if UDP header
is followed by an instruction (with explicit null label)  or directly by
the payload.
Programming this information from the control plane might not be
straightforward as well, as a node might have different roles in different
paths via the SR domain. In one path the node acts as termination nod while
in another path the node acts as a transit node.

Put in other words, it would be better it packet format can be determined
just by looking into packet data.

Thanks Leonid

Pop the explicit null label if it is present in the label stack as
> requested by the domain egress and communicated in the control
> plane as described in Section 7
> <https://tools.ietf.org/html/draft-bryant-mpls-unified-ip-sr-02#section-7>
> .

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<div dir=3D"ltr"><div>Hello,=C2=A0</div><div><br></div><div>I would like to=
 clarify on PHP explicit null label support in the forwarding plane.</div><=
div><br></div><div>On segment termination node the forwarding plane can&#39=
;t tell if UDP header is followed by an instruction (with explicit null lab=
el)=C2=A0 or directly by the payload.=C2=A0</div><div>Programming this info=
rmation from the control plane might not be straightforward as well, as a n=
ode might have different roles in different paths via the SR domain. In one=
 path the node acts as termination nod while in another path the node acts =
as a transit node.=C2=A0</div><div><br></div><div>Put in other words, it wo=
uld be better it packet format can be determined just by looking into packe=
t data.=C2=A0</div><div><br></div><div>Thanks Leonid=C2=A0</div><div><br></=
div><blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb=
(204,204,204);padding-left:1ex" class=3D"gmail_quote">Pop the explicit null=
 label if it is present in the label stack as<br>      requested by the dom=
ain egress and communicated in the control<br>      plane as described in <=
a href=3D"https://tools.ietf.org/html/draft-bryant-mpls-unified-ip-sr-02#se=
ction-7">Section 7</a>.</blockquote></div>

--001a1147999c41aa84055b273fe5--


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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Leonid Okner <leonid.okner@broadcom.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] MPLS Segment Routing in IP Networks
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From: Alvaro Retana <aretana.ietf@gmail.com>
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Dear authors:

=20

Hi!

=20

It=E2=80=99s been 2 months since I sent out this review and I still haven=E2=80=99t hea=
rd anything back (not even an ACK!) from you.=C2=A0 What is the plan to address =
the comments and move this work forward?

=20

Thanks!

=20

Alvaro.

=20

From: spring <spring-bounces@ietf.org> on behalf of Alvaro Retana <aretana@=
cisco.com>
Date: Thursday, August 10, 2017 at 3:00 PM
To: "draft-ietf-spring-segment-routing@ietf.org" <draft-ietf-spring-segment=
-routing@ietf.org>
Cc: "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "spring@ietf.org" <s=
pring@ietf.org>, Martin Vigoureux <martin.vigoureux@nokia.com>
Subject: [spring] AD Review of draft-ietf-spring-segment-routing-12

=20

Dear authors:

=20

I just finished reviewing this document =E2=80=93 sorry for the delay in processi=
ng.  Thanks for all the work you=E2=80=99ve but into this document!

=20

I have some significant concerns (see below for details).  In general, the =
document presents an incomplete view of the architecture: details about impo=
rtant pieces are barely mentioned or not fully described, as is the case of =
the role of a central controller (PCE), and the BGP and Binding Segments. =20

=20

Also, some of the architectural details are predicated on specific bits def=
ined in the extensions, where this document should describe the general oper=
ation and leave the details (like bit names) to the extensions.  Note that I=
=E2=80=99m not asking that you don=E2=80=99t mention the extensions =E2=80=93 pointing to them=
 is fine --, I=E2=80=99m asking you to define the functionality in general and not=
 as a function of the extensions.  For an example, see point M5.1. below.

=20

I will wait for at least the Major comments to be addressed before starting=
 the IETF Last Call.

=20

Thanks!

=20

Alvaro.

=20

=20

=20

Major:

=20

M1. The Introduction mentions several types of segments, and it says that t=
he LDP LSP, RSVP-TE LSP, and BGP LSP segments are =E2=80=9Cillustrated in [I-D.iet=
f-spring-segment-routing-mpls]=E2=80=9D.  But that is only true for the first two,=
 for which examples are shown.  Where are these segment types defined?  The =
definition, and not the examples, is the Major issue here.  This document be=
ing the main architecture document should include the complete description. =
 BTW, the list is only about the =E2=80=9CMPLS instantiation=E2=80=9D, are there similar=
 types of segments for IP?

=20

=20

M2. From Section 2. (Terminology): =E2=80=9CUsing the same SRGB on all nodes with=
in the SR domain ease operations and troubleshooting and is expected to be a=
 deployment guideline.=E2=80=9D  It is =E2=80=9Cexpected to be a deployment guideline=E2=80=9D=
 where/when??  Given that this document is the general architecture, I figur=
ed that maybe draft-ietf-spring-segment-routing-mpls contained that deployme=
nt recommendation, but all that document says is: =E2=80=9CAs described in [I-D.ie=
tf-spring-segment-routing], using the same SRGB on all nodes within the SR d=
omain eases operations and troubleshooting and is expected to be a deploymen=
t guideline.=E2=80=9D  So=E2=80=A6where are the Deployment/Operational considerations re=
lated to the SRGB?  I note that neither document (draft-ietf-spring-segment-=
routing or draft-ietf-spring-segment-routing-mpls) include them.  I would ex=
pect some information to be in this (general) document and other more specif=
ic information (like the considerations about using the same SRGB) to be in =
the more specific document (draft-ietf-spring-segment-routing-mpls, in this =
case).

=20

M2.1.  The example illustrated in Figure 2 would be a great place to demons=
trate the value of having the same SRGB.  In fact, the text now shows things=
 not working and it even warns by saying that =E2=80=9Cusing anycast segment witho=
ut configuring the same SRGB on nodes belonging to the same device group may=
 lead to misrouting=E2=80=9D, but no explanation of how it should be done the righ=
t way.

=20

=20

M3. From Section 2. (Terminology): =E2=80=9C=E2=80=A6a global segment is represented by=
 a globally-unique index.=E2=80=9D =20

=20

M3.1.  I couldn=E2=80=99t find anywhere a discussion about the use of the index. =
 When it is discussed in 3.1.2, it seems to be an understood concept: =E2=80=9CA P=
refix-SID is allocated in the form of an index in the SRGB=E2=80=A6=E2=80=9D  Even if st=
raightforward, I think the concept of the index should be explained (maybe w=
ith an example) and not assumed.  I again went to look at draft-ietf-spring-=
segment-routing-mpls, but that document just points back to this one: =E2=80=9CThe=
 notion of indexed global segment, defined in [I-D.ietf-spring-segment-routi=
ng]=E2=80=A6=E2=80=9D=20

=20

M3.2. I assume that =E2=80=9Cglobally-unique index=E2=80=9D is really unique to the SR =
Domain, right?  I ask this question because =E2=80=9Cglobally-unique IPv6 address=E2=
=80=9D has a different connotation (as in unique world-wide, not just inside a d=
omain).  Please clarify.

=20

M3.3.  Note that the latest version (-10) of draft-ietf-spring-segment-rout=
ing-mpls introduced the SR Local Block (SRLB) which is not defined in this d=
ocument.  I mention it here because it was introduced right after the pointe=
r about the index=E2=80=A6

=20

=20

M4. Section 3.1.1. (Prefix-SID Algorithm)

=20

M4.1. This section starts by justifying the use of an algorithm based on th=
e IGP protocol extensions: the extensions have an algorithm field, so we sho=
uld use it.  The justification should be the other way around: this document=
 (the architecture) defines the concept of an algorithm and the extensions i=
mplement it.  Please re-word the first 3 paragraphs =E2=80=93 note that the instan=
ce/topology references seem superfluous to me.

=20

M4.2. The algorithms are not really defined =E2=80=93 there are mentions of a =E2=80=9C=
well known ECMP-aware SPF algorithm=E2=80=9D, but no specific reference to what th=
at is.  The last sentence in the Section mentions that the =E2=80=9Cdetails of the=
 two defined algorithms are defined in=E2=80=A6=E2=80=9D pointing to the extension draft=
s =E2=80=93 but those drafts just offer an additional piece of information in (fro=
m the OSPF document): =E2=80=9Cthe standard shortest path algorithm as computed by=
 the OSPF protocol=E2=80=9D.  Ideally the algorithms would be defined here (even i=
f it is just to say: =E2=80=9Cthe standard algorithm used in the corresponding IGP=
=E2=80=9D), and the extensions would just reference it.=20

=20

M4.3.  When should the packets be dropped??  The following text points to a=
t least 3 different places where it should be dropped, one marked with a MUS=
T.  Please clarify.

=20

M4.3.1. =E2=80=9CA router MUST drop any SR traffic associated with the SR algorit=
hm to the adjacent router, if the adjacent router has not advertised support=
 for such SR algorithm.=E2=80=9D  Ok, this sounds as if the traffic is dropped one=
 hop before the router not supporting the algorithm =E2=80=93 and it has a MUST in=
 it.

=20

M4.3.2. =E2=80=9CThe ingress node of an SR domain validates that the path to a pr=
efix=E2=80=A6includes nodes all supporting the advertised algorithm.  As a consequ=
ence, if a node on the path does not support algorithm X, the IGP-Prefix seg=
ment will be interrupted and will drop packet on that node.=E2=80=9D  This sounds =
like the traffic would be dropped on the node not supporting the algorithm.

=20

M4.3.3. =E2=80=9CIt's the responsibility of the ingress node using a segment to c=
heck that all downstream nodes support the algorithm of the segment.=E2=80=9D  Thi=
s last sentence hints at the fact that the ingress node should maybe even st=
op the traffic there, or maybe not sending it unless all nodes in the path s=
upport the same algorithm=E2=80=A6

=20

=20

M5. Section 3.1.2. (MPLS Dataplane). =20

=20

M5.1. The first bullet (again!) explains the architecture in function of th=
e extensions.  The architecture should explain what needs to be done and the=
 extensions would then do it=E2=80=A6  Suggestion:

=20

NEW>

   In order to achieve a behavior equivalent to Penultimate Hop Popping

   in MPLS [Reference], a Node N advertising a Prefix-SID SID-R for its=20

   attached prefix R MUST be able to instruct its connected neighbors to=20

   perform the NEXT operation while processing SID-R.  Upon receiving=20

   this instruction from Node N, its neighbors of N MUST perform the NEXT

   operation while processing SID-R.  Alternatively, the neighbors of N=20

   MUST perform the CONTINUE operation while processing SID-R.

=20

M5.1.1. The penultimate bullet refers again to the extensions (but it only =
mentions the P-bit this time).  Please explain what the architecture intends=
 to do, but not from the point of view of the extensions.  This and the last=
 bullet seem to be the result of the first one (above).  I think that the fi=
rst bullet would have enough text for the FIB entries to be obvious, but if =
you want to include this corollary, please do it right after.

=20

M5.2. =E2=80=9CA Prefix-SID is allocated in the form of an index in the SRGB (or =
as a local MPLS label) according to a process similar to IP address allocati=
on.=E2=80=9D  The SRGB is defined (in the Terminology section) as =E2=80=9Cthe set of lo=
cal labels reserved for global segments=E2=80=9D, what is the difference between =E2=
=80=9Can index in the SRGB=E2=80=9D and =E2=80=9Ca local MPLS label=E2=80=9D?  I=E2=80=99m hoping that t=
he explanation of the concept of index would clarify this.

=20

M5.2.1. Three bullets down=E2=80=A6 =E2=80=9CIf a node learns a Prefix-SID having a val=
ue that falls outside the locally configured SRGB range, then the node MUST =
NOT use the Prefix-SID=E2=80=A6=E2=80=9D  Going back to my previous question: it looks l=
ike =E2=80=9Ca local MPLS label=E2=80=9D would have to be included in the SRGB =E2=80=93 again=
, clarifying upfront would help a lot.  Note that this piece of text falls i=
nto the recommendation of having the same SRGB configured in all nodes.

=20

M5.2.2.  Related to the concept of index and its relationship to the SRGB=E2=80=
=A6the next bullet says: =E2=80=9C=E2=80=A6the segment is global (the SID is allocated fro=
m the SRGB or as an index)=E2=80=9D.  We now have =E2=80=9Cglobally-unique index=E2=80=9D, =E2=80=9C=
an index in the SRGB=E2=80=9D, and =E2=80=9Cthe SRGB or as an index=E2=80=9D (separately).

=20

=20

M6. Section 3.3. (IGP-Anycast Segment, Anycast SID): =E2=80=9C=E2=80=A6the value of the=
 SID following the anycast SID MUST be understood by all nodes advertising t=
he same anycast segment.=E2=80=9D  It seems to me that this is really a statement =
of fact: all nodes, not just ones advertising an anycast segment must unders=
tand what to do with the next SID=E2=80=A6  IOW, s/MUST/must  I would even take th=
is sentence out because it is redundant and obvious.

=20

=20

M7. Section 3.4. (IGP-Adjacency Segment, Adj-SID) also tries to explain fun=
ctionality starting from the extensions.

=20

M7.1. =E2=80=9CThe encodings of the Adj-SID include the a set of flags among whic=
h there is the B-flag.  When set, the Adj-SID refers to an adjacency that is=
 eligible for protection (e.g.: using IPFRR or MPLS-FRR).=E2=80=9D  If the Adjacen=
cy Segment is one that is locally significant to the node advertising it, wh=
at is the purpose of signaling that it is eligible for protection?  Wouldn=E2=80=
=99t that be a local decision as well?  Maybe an example of how the architectu=
re is expected to work would help.

=20

M7.2. =E2=80=9CThe encodings of the Adj-SID also include the L-flag.  When set, t=
he Adj-SID has local significance.  By default, the L-flag is set.=E2=80=9D  The d=
efinition of IGP-Adjacency Segment already says that it is =E2=80=9Clocal (unless =
explicitly advertised otherwise)=E2=80=9D, which makes this statement unnecessary.=
  If you want to keep it, please figure out a way that doesn=E2=80=99t justify it =
based on a bit in the extensions.

=20

=20

M8. Section 3.5. (Binding Segment).  A binding segment is not described any=
where in this document =E2=80=93 please do so!  Section 3.5.1. (Mapping Server) me=
ntions a =E2=80=9CRemote-Binding SID S advertised by the mapping server=E2=80=9D, and sa=
ys that more =E2=80=9Cdetails are described in the SR/LDP interworking procedures =
([I-D.ietf-spring-segment-routing-ldp-interop]=E2=80=9D, but that draft doesn=E2=80=99t =
mention a Binding Segment.  Section 5. (IGP Mirroring Context Segment) says =
that =E2=80=9Cthe binding segment [is] defined in SR IGP protocol extensions ( [I-=
D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-exte=
nsions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions])=E2=80=9D; however, =
those documents don=E2=80=99t mention a Binding Segment, they just (except for the=
 OSPFv2 draft) define TLVs.  Note that I-D.ietf-ospf-segment-routing-extensi=
ons points back to this document when referring to the definition of a Bindi=
ng SID, completing a circular reference.

=20

M8.1. BTW, Section 5. (IGP Mirroring Context Segment) says that the =E2=80=9CMirr=
or SID is advertised using the binding segment=E2=80=9D, which then looks like the=
 Mirror Segment is an application of the Binding Segment (+ an explicit indi=
cation of it).  I think that Section 5 should then be moved to be a sub-sect=
ion of 3.5.

=20

M8.2. Part of the Security Considerations (in Section 8.1) are related to t=
he Binding SID, which is another reason for clearly explaining that part of =
the architecture here.

=20

=20

M9. Section 3.5.1. (Mapping Server) mentions a Mapping Server, but it punts=
 to I-D.ietf-spring-segment-routing-ldp-interop for further details.  While =
the SRMS can be used for interoperability cases, I think that it is an impor=
tant part of the overall architecture and as such it should be described and=
 discussed in this document instead=E2=80=A6including any Manageability Considerat=
ions (as mentioned in Section 9).

=20

=20

M10. Section 3.6. (Inter-Area Considerations)=20

=20

M10.1. This section shows an example of the behavior: maintain the SID acro=
ss area boundaries.  But it doesn=E2=80=99t actually say how the architecture is e=
xpected to work.  IOW, in the example the SID is maintained, but should that=
 always happen (MUST, SHOULD)? Or is it just an example (MAY)?

=20

M10.2. Another case of explaining the architecture based on the extension f=
unctionality: =E2=80=9CWhen an ABR propagates a prefix from one area to another it=
 MUST set the R-Flag.=E2=80=9D  Maybe try something like this instead: =E2=80=9CThe re-a=
dvertisement of an SID that originated on a different IGP area MUST be indic=
ated.=E2=80=9D

=20

M10.3. [minor] As the advertisement moves to the left (from Area 2 to the B=
ackbone=E2=80=A6), the ABRs change the Node-SID for a Prefix-SID, right?  The desc=
ription in the last 3 paragraphs uses Node-SID: =E2=80=9Cnode S=E2=80=A6pushes Node-SID(=
150)=E2=80=9D.

=20

M10.4. [minor] Going back to global vs local significance, it would be nice=
 to remind the readers at this point that the SR domain is really the whole =
IGP network, and not just one flooding domain=E2=80=A6which is why SID 150 can be =
used throughout.

=20

=20

M11. Section 4. (BGP Peering Segments) is the only non-IGP focused section =
in this document.  The architecture of the EPE solution (as described in dra=
ft-ietf-spring-segment-routing-central-epe) goes beyond what has already bee=
n discussed here because it incorporates elements such as a mandatory centra=
lized controller, which was optional before (a PCE server is mentioned only =
casually in the Terminology section).  This leaves us with an incomplete arc=
hitecture for the BGP case.  I would prefer it if the whole architecture was=
 defined in this single document (i.e. expand this section by potentially mo=
ving parts from draft-ietf-spring-segment-routing-central-epe =E2=80=93 which migh=
t leave that document without enough content to stand alone).

=20

=20

M12. Section 8. (Security Considerations).  The main part of this section t=
alks about the instructions on the packets =E2=80=93 is adding that meta-data a se=
curity concern?  I think it could be because someone watching could tell whi=
ch =E2=80=9Cforwarding path elements (e.g.: nodes, links, services, etc.)=E2=80=9D are u=
sed for specific flows, etc.   But I also think that the risk is mitigated b=
y the fact that the information MUST NOT be exposed outside the SR domain.  =
Mentioning that, and the fact that the SR domain will usually be under a sin=
gle administration would be a good thing.

=20

=20

M13. Section 9. (Manageability Considerations) says that =E2=80=9Can implementati=
on SHOULD protect the network in case of conflict detection by providing a d=
eterministic resolution approach=E2=80=A6addressed in [I-D.ietf-spring-conflict-re=
solution].=E2=80=9D  That =E2=80=9CSHOULD=E2=80=9D is in conflict with I-D.ietf-spring-conflic=
t-resolution (in WGLC) where it says that =E2=80=9CAll protocols which support SR =
MUST adhere to the policies defined in this document.=E2=80=9D  It seems like the =
easy way forward is to s/SHOULD/MUST.  In either case, I think that I-D.ietf=
-spring-conflict-resolution should be a Normative reference.

=20

=20

=20

Minor:

=20

P1. Introduction

=20

P1.1. The term =E2=80=9Cservice chain=E2=80=9D is used in the Abstract and in the Intro=
duction.  Given that the concept is not vital to the architecture and that t=
here might be unnecessary confusion with SFC, I would suggest taking it out.

=20

P1.2.  Related=E2=80=A6  Section 1.1 says that this document =E2=80=9Cdefines=E2=80=A6the ser=
vice segments=E2=80=9D, but there=E2=80=99s no specific mention of =E2=80=9Cservice segments=E2=80=
=9D anywhere, except for a very quick mention in Section 5. (IGP Mirroring Con=
text Segment).  What am I missing?  Consider taking =E2=80=9Cservice segments=E2=80=9D o=
ff the list of things this document defines.

=20

P1.3. The last paragraph says that =E2=80=9CThis document defines a set of instru=
ctions (called segments) that are required to fulfill the described use-case=
s.=E2=80=9D  The use cases are not mentioned until 1.1.  Suggestion: merge Section=
 1 and 1.1 to provide proper flow to the text.

=20

P1.4. Speaking of use cases, I-D.ietf-spring-oam-usecase doesn=E2=80=99t actually=
 include use cases that will affect the architecture.  It includes use case =
of how to use monitoring system defined in it.  Same comment for the mention=
 in Section 9.

=20

=20

P2. From Section 2. (Terminology)

=20

P2.1. SID is not defined, just extended.  Besides the examples, please prov=
ide an actual definition.

=20

P2.2. =E2=80=9CThe CONTINUE instruction is implemented as the SWAP instruction in=
 the MPLS dataplane.=E2=80=9D  Please include a reference to where the =E2=80=9CSWAP ins=
truction=E2=80=9D is defined.  I assume you=E2=80=99re really referring to =E2=80=9Clabel swap=
ping=E2=80=9D in rfc3031, are you?  If so, please be consistent as =E2=80=9CMPLS datapla=
ne=E2=80=9D and =E2=80=9CMPLS architecture=E2=80=9D are used in different places.

=20

P2.3. The =E2=80=9CLocal Segment=E2=80=9D definition says that for IPv6 it =E2=80=9Cis not ad=
vertised in any routing protocol=E2=80=9D.  But for MPLS it is advertised, right? =
 Please clarify.  I think that some of the vocabulary is a little confusing,=
 for example, the definition of IGP-Adjacency Segment says that it =E2=80=9Cis loc=
al (unless explicitly advertised otherwise) to the node that advertises it=E2=80=
=9D =E2=80=93 this means that for IPv6 this piece of the architecture wouldn=E2=80=99t app=
ly because a Local Segment is not advertised.  To add to the confusion, draf=
t-filsfils-spring-srv6-network-programming talks about local SIDs=E2=80=A6  IOW, i=
n some places it sounds as if what should be the general architecture only r=
eally applies to MPLS =E2=80=93 or maybe we need a more explicit local qualifier.

=20

P2.4. =E2=80=9CThe PCEP discovery capability is described in [I-D.ietf-pce-segmen=
t-routing].=E2=80=9D  That document doesn=E2=80=99t even mention the word =E2=80=9Cdiscovery=E2=80=
=9D.  Please use the proper name for easier cross-reference.

=20

P2.5. =E2=80=9Cunless explicitly advertised otherwise=E2=80=9D is used to qualify the g=
lobal/local nature of a segment.  How do the characteristics of the segment =
change if =E2=80=9Cexplicitly advertised otherwise=E2=80=9D?  For example, if an IGP-Pre=
fix Segment is advertised as local, how do its characteristics change, or do=
 they?

=20

P2.5.1. In Section 3.4. (IGP-Adjacency Segment, Adj-SID), the use of an Adj=
-SID is illustrated for both the local and global cases, but both explanatio=
ns say the same thing: =E2=80=9Cforwarded along the shortest-path to N and then be=
 switched by N, without any IP shortest-path consideration, towards link L=E2=80=
=9D =E2=80=93 I don=E2=80=99t see a difference in behavior between the local and global na=
ture of this SID.  There is some additional text related to global: =E2=80=9CThe u=
se of global Adj-SID allows to reduce the size of the segment list when expr=
essing a path at the cost of additional state (i.e.: the global Adj-SID will=
 be inserted by all routers within the area in their forwarding table).=E2=80=9D  =
If node N is the one executing on the Adj-SID, how does including it in othe=
r FIBs help?

=20

P2.6. None of the segments after Section 3.4 (binding, BGP, mirroring) are =
defined in the Terminology.  Please do so for completeness.

=20

=20

P3. Referring to Figure 1: =E2=80=9C=E2=80=A6each PE device is connected to two routers=
 in each of the groups A and B.=E2=80=9D  The routers connected to the PEs (Rx) ar=
e not in either group.

=20

=20

P4. s/Obviously// =20

=20

=20

P5. Section 3.4. (IGP-Adjacency Segment, Adj-SID): =E2=80=9CThe remote node MAY b=
e an adjacent IGP neighbor or a non-adjacent neighbor=E2=80=A6=E2=80=9D  The =E2=80=9CMAY=E2=80=9D i=
s out of place as there isn=E2=80=99t another option, it is one or the other.  s/M=
AY/may

=20

=20

P6. Maybe it=E2=80=99s because the rest of 3.5 is incomplete, but Section 3.5.2. =
(Tunnel Head-end) has no context to speak of =E2=80=93 without that, it feels like=
 an orphan section.

=20

=20

P7. Section 8.1. (MPLS Data Plane)

=20

P7.1. You included a couple of references at the end of this section, which=
 is good.  I would however not explicitly mention specific sections, as the =
whole RFCs (rfc4381 and rfc5920) are about MPLS-related security.

=20

P7.2. You compare the use of a single segment to RSVP-TE =E2=80=93 if the securit=
y characteristics are similar, please provide a reference.

=20

=20

P8. References

=20

P8.1. RFC2460 was obsoleted by RFC8200 / RFC6822 was obsoleted by RFC8202

=20

P8.2. I think that the reference to RFC4206 should be Informative.

=20

=20

=20

Nits:

=20

N1. The Abstract is very long =E2=80=93 I would even say too long.  If it was up =
to me, I would leave just the first paragraph.

=20

N2. The second to last paragraph in the Introduction (=E2=80=9CNumerous use-cases=
=E2=80=A6=E2=80=9D) references the =E2=80=9Cmarketing style=E2=80=9D content of I-D.ietf-spring-oam-=
usecase.  I have asked the authors of that document to please focus their co=
ntent.  Please consider taking this paragraph out.

=20

N3. s/participating into the source based/participating in the source based

=20

N4. References.  Please add Informative references to netconf (Section 2), =
PCEP (2), FRR (3.1.1), =E2=80=9Cparallel adjacency suppression=E2=80=9D (3.4).

=20

N5. Section 3: =E2=80=9CIGP segments require extensions in link-state IGP protoco=
ls.  IGP extensions are required in order to advertise the IGP segments.=E2=80=9D =
 These 2 sentences say the exact same thing. =20

=20

N6. Please avoid using =E2=80=9Cwe=E2=80=9D in the text =E2=80=93 except for the Acknowledgem=
ents.

=20

N7. s/Regardless Segment Routing/Independent of Segment Routing

=20

N8. s/and not to each other individual nodes in the LAN/and not to individu=
al nodes in the LAN

=20

N9. s/([I-D.ietf-spring-segment-routing-ldp-interop]/[I-D.ietf-spring-segme=
nt-routing-ldp-interop]

=20

N10. =E2=80=9CIGP deployed using areas=E2=80=9D  An area is an OSPF-specific construct =
=E2=80=93 flooding domain is more generic.

=20

N11. It would be nice if the examples used IPv6 instead of IPv4.


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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'>Dear authors:<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-s=
ize:11.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font=
-size:11.0pt'>Hi!<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'fon=
t-size:11.0pt'>It=E2=80=99s been 2 months since I sent out this review and I still=
 haven=E2=80=99t heard anything back (not even an ACK!) from you.=C2=A0 What is the pl=
an to address the comments and move this work forward?<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'>Thanks!<o:p></o:p></span=
></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></sp=
an></p><p class=3DMsoNormal><span 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><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3=
.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'color:black'>From: </sp=
an></b><span style=3D'color:black'>spring &lt;spring-bounces@ietf.org&gt; on b=
ehalf of Alvaro Retana &lt;aretana@cisco.com&gt;<br><b>Date: </b>Thursday, A=
ugust 10, 2017 at 3:00 PM<br><b>To: </b>&quot;draft-ietf-spring-segment-rout=
ing@ietf.org&quot; &lt;draft-ietf-spring-segment-routing@ietf.org&gt;<br><b>=
Cc: </b>&quot;spring-chairs@ietf.org&quot; &lt;spring-chairs@ietf.org&gt;, &=
quot;spring@ietf.org&quot; &lt;spring@ietf.org&gt;, Martin Vigoureux &lt;mar=
tin.vigoureux@nokia.com&gt;<br><b>Subject: </b>[spring] AD Review of draft-i=
etf-spring-segment-routing-12<o:p></o:p></span></p></div><div><p class=3DMsoNo=
rmal><span style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p></div><p cla=
ss=3DMsoNormal>Dear authors:<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p=
></p><p class=3DMsoNormal>I just finished reviewing this document =E2=80=93 sorry fo=
r the delay in processing.&nbsp; Thanks for all the work you=E2=80=99ve but into t=
his document!<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=
=3DMsoNormal>I have some significant concerns (see below for details).&nbsp; I=
n general, the document presents an incomplete view of the architecture: det=
ails about important pieces are barely mentioned or not fully described, as =
is the case of the role of a central controller (PCE), and the BGP and Bindi=
ng Segments.&nbsp; <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p=
 class=3DMsoNormal>Also, some of the architectural details are predicated on s=
pecific bits defined in the extensions, where this document should describe =
the general operation and leave the details (like bit names) to the extensio=
ns.&nbsp; Note that I=E2=80=99m not asking that you don=E2=80=99t mention the extensions=
 =E2=80=93 pointing to them is fine --, I=E2=80=99m asking you to define the functionali=
ty in general and not as a function of the extensions.&nbsp; For an example,=
 see point M5.1. below.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></=
p><p class=3DMsoNormal>I will wait for at least the Major comments to be addre=
ssed before starting the IETF Last Call.<o:p></o:p></p><p class=3DMsoNormal>&n=
bsp;<o:p></o:p></p><p class=3DMsoNormal>Thanks!<o:p></o:p></p><p class=3DMsoNorm=
al>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Alvaro.<o:p></o:p></p><p class=3DMs=
oNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p clas=
s=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Major:<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M1. The Introduction=
 mentions several types of segments, and it says that the LDP LSP, RSVP-TE L=
SP, and BGP LSP segments are =E2=80=9Cillustrated in [I-D.ietf-spring-segment-rout=
ing-mpls]=E2=80=9D.&nbsp; But that is only true for the first two, for which examp=
les are shown.&nbsp; Where are these segment types defined?&nbsp; The defini=
tion, and not the examples, is the Major issue here.&nbsp; This document bei=
ng the main architecture document should include the complete description.&n=
bsp; BTW, the list is only about the =E2=80=9CMPLS instantiation=E2=80=9D, are there sim=
ilar types of segments for IP?<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M2. From=
 Section 2. (Terminology): =E2=80=9CUsing the same SRGB on all nodes within the SR=
 domain ease operations and troubleshooting and is expected to be a deployme=
nt guideline.=E2=80=9D&nbsp; It is =E2=80=9Cexpected to be a deployment guideline=E2=80=9D whe=
re/when??&nbsp; Given that this document is the general architecture, I figu=
red that maybe draft-ietf-spring-segment-routing-mpls contained that deploym=
ent recommendation, but all that document says is: =E2=80=9CAs described in [I-D.i=
etf-spring-segment-routing], using the same SRGB on all nodes within the SR =
domain eases operations and troubleshooting and is expected to be a deployme=
nt guideline.=E2=80=9D&nbsp; So=E2=80=A6where are the Deployment/Operational considerati=
ons related to the SRGB?&nbsp; I note that neither document (draft-ietf-spri=
ng-segment-routing or draft-ietf-spring-segment-routing-mpls) include them. =
&nbsp;I would expect some information to be in this (general) document and o=
ther more specific information (like the considerations about using the same=
 SRGB) to be in the more specific document (draft-ietf-spring-segment-routin=
g-mpls, in this case).<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p=
><p class=3DMsoNormal>M2.1.&nbsp; The example illustrated in Figure 2 would be=
 a great place to demonstrate the value of having the same SRGB.&nbsp; In fa=
ct, the text now shows things not working and it even warns by saying that =E2=
=80=9Cusing anycast segment without configuring the same SRGB on nodes belonging=
 to the same device group may lead to misrouting=E2=80=9D, but no explanation of h=
ow it should be done the right way.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<=
o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M3.=
 From Section 2. (Terminology): =E2=80=9C=E2=80=A6a global segment is represented by a g=
lobally-unique index.=E2=80=9D&nbsp; <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p>=
</o:p></p><p class=3DMsoNormal>M3.1.&nbsp; I couldn=E2=80=99t find anywhere a discus=
sion about the use of the index.&nbsp; When it is discussed in 3.1.2, it see=
ms to be an understood concept: =E2=80=9CA Prefix-SID is allocated in the form of =
an index in the SRGB=E2=80=A6=E2=80=9D&nbsp; Even if straightforward, I think the concep=
t of the index should be explained (maybe with an example) and not assumed.&=
nbsp; I again went to look at draft-ietf-spring-segment-routing-mpls, but th=
at document just points back to this one: =E2=80=9CThe notion of indexed global se=
gment, defined in [I-D.ietf-spring-segment-routing]=E2=80=A6=E2=80=9D <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M3.2. I assume that =
=E2=80=9Cglobally-unique index=E2=80=9D is really unique to the SR Domain, right?&nbsp; =
I ask this question because =E2=80=9Cglobally-unique IPv6 address=E2=80=9D has a differe=
nt connotation (as in unique world-wide, not just inside a domain).&nbsp; Pl=
ease clarify.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=
=3DMsoNormal>M3.3.&nbsp; Note that the latest version (-10) of draft-ietf-spri=
ng-segment-routing-mpls introduced the SR Local Block (SRLB) which is not de=
fined in this document.&nbsp; I mention it here because it was introduced ri=
ght after the pointer about the index=E2=80=A6<o:p></o:p></p><p class=3DMsoNormal>&n=
bsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNorma=
l>M4. Section 3.1.1. (Prefix-SID Algorithm)<o:p></o:p></p><p class=3DMsoNormal=
>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M4.1. This section starts by justif=
ying the use of an algorithm based on the IGP protocol extensions: the exten=
sions have an algorithm field, so we should use it.&nbsp; The justification =
should be the other way around: this document (the architecture) defines the=
 concept of an algorithm and the extensions implement it.&nbsp; Please re-wo=
rd the first 3 paragraphs =E2=80=93 note that the instance/topology references see=
m superfluous to me.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><=
p class=3DMsoNormal>M4.2. The algorithms are not really defined =E2=80=93 there are =
mentions of a =E2=80=9Cwell known ECMP-aware SPF algorithm=E2=80=9D, but no specific ref=
erence to what that is.&nbsp; The last sentence in the Section mentions that=
 the =E2=80=9Cdetails of the two defined algorithms are defined in=E2=80=A6=E2=80=9D pointing =
to the extension drafts =E2=80=93 but those drafts just offer an additional piece =
of information in (from the OSPF document): =E2=80=9Cthe standard shortest path al=
gorithm as computed by the OSPF protocol=E2=80=9D.&nbsp; Ideally the algorithms wo=
uld be defined here (even if it is just to say: =E2=80=9Cthe standard algorithm us=
ed in the corresponding IGP=E2=80=9D), and the extensions would just reference it.=
 <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M=
4.3.&nbsp; When should the packets be dropped??&nbsp; The following text poi=
nts to at least 3 different places where it should be dropped, one marked wi=
th a MUST.&nbsp; Please clarify.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p=
></o:p></p><p class=3DMsoNormal>M4.3.1. =E2=80=9CA router MUST drop any SR traffic a=
ssociated with the SR algorithm to the adjacent router, if the adjacent rout=
er has not advertised support for such SR algorithm.=E2=80=9D&nbsp; Ok, this sound=
s as if the traffic is dropped one hop before the router not supporting the =
algorithm =E2=80=93 and it has a MUST in it.<o:p></o:p></p><p class=3DMsoNormal>&nbs=
p;<o:p></o:p></p><p class=3DMsoNormal>M4.3.2. =E2=80=9CThe ingress node of an SR dom=
ain validates that the path to a prefix=E2=80=A6includes nodes all supporting the =
advertised algorithm.&nbsp; As a consequence, if a node on the path does not=
 support algorithm X, the IGP-Prefix segment will be interrupted and will dr=
op packet on that node.=E2=80=9D&nbsp; This sounds like the traffic would be dropp=
ed on the node not supporting the algorithm.<o:p></o:p></p><p class=3DMsoNorma=
l>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M4.3.3. =E2=80=9CIt's the responsibility=
 of the ingress node using a segment to check that all downstream nodes supp=
ort the algorithm of the segment.=E2=80=9D&nbsp; This last sentence hints at the f=
act that the ingress node should maybe even stop the traffic there, or maybe=
 not sending it unless all nodes in the path support the same algorithm=E2=80=A6<o=
:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbs=
p;<o:p></o:p></p><p class=3DMsoNormal>M5. Section 3.1.2. (MPLS Dataplane).&nbs=
p; <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal=
>M5.1. The first bullet (again!) explains the architecture in function of th=
e extensions.&nbsp; The architecture should explain what needs to be done an=
d the extensions would then do it=E2=80=A6&nbsp; Suggestion:<o:p></o:p></p><p clas=
s=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>NEW&gt;<o:p></o:p></p><p=
 class=3DMsoNormal>&nbsp;&nbsp; In order to achieve a behavior equivalent to P=
enultimate Hop Popping<o:p></o:p></p><p class=3DMsoNormal>&nbsp;&nbsp; in MPLS=
 [Reference], a Node N advertising a Prefix-SID SID-R for its <o:p></o:p></p=
><p class=3DMsoNormal>&nbsp;&nbsp;&nbsp;attached prefix R MUST be able to inst=
ruct its connected neighbors to <o:p></o:p></p><p class=3DMsoNormal>&nbsp;&nbs=
p;&nbsp;perform the NEXT operation while processing SID-R.&nbsp; Upon receiv=
ing <o:p></o:p></p><p class=3DMsoNormal>&nbsp;&nbsp;&nbsp;this instruction fro=
m Node N, its neighbors of N MUST perform the NEXT<o:p></o:p></p><p class=3DMs=
oNormal>&nbsp;&nbsp; operation while processing SID-R.&nbsp; Alternatively, =
the neighbors of N <o:p></o:p></p><p class=3DMsoNormal>&nbsp;&nbsp;&nbsp;MUST =
perform the CONTINUE operation while processing SID-R.<o:p></o:p></p><p clas=
s=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M5.1.1. The penultimate =
bullet refers again to the extensions (but it only mentions the P-bit this t=
ime).&nbsp; Please explain what the architecture intends to do, but not from=
 the point of view of the extensions.&nbsp; This and the last bullet seem to=
 be the result of the first one (above).&nbsp; I think that the first bullet=
 would have enough text for the FIB entries to be obvious, but if you want t=
o include this corollary, please do it right after.<o:p></o:p></p><p class=3DM=
soNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M5.2. =E2=80=9CA Prefix-SID is al=
located in the form of an index in the SRGB (or as a local MPLS label) accor=
ding to a process similar to IP address allocation.=E2=80=9D&nbsp; The SRGB is def=
ined (in the Terminology section) as =E2=80=9Cthe set of local labels reserved for=
 global segments=E2=80=9D, what is the difference between =E2=80=9Can index in the SRGB=E2=
=80=9D and =E2=80=9Ca local MPLS label=E2=80=9D?&nbsp; I=E2=80=99m hoping that the explanation of =
the concept of index would clarify this.<o:p></o:p></p><p class=3DMsoNormal>&n=
bsp;<o:p></o:p></p><p class=3DMsoNormal>M5.2.1. Three bullets down=E2=80=A6 =E2=80=9CIf a =
node learns a Prefix-SID having a value that falls outside the locally confi=
gured SRGB range, then the node MUST NOT use the Prefix-SID=E2=80=A6=E2=80=9D&nbsp; Goin=
g back to my previous question: it looks like =E2=80=9Ca local MPLS label=E2=80=9D would=
 have to be included in the SRGB =E2=80=93 again, clarifying upfront would help a =
lot.&nbsp; Note that this piece of text falls into the recommendation of hav=
ing the same SRGB configured in all nodes.<o:p></o:p></p><p class=3DMsoNormal>=
&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M5.2.2.&nbsp; Related to the concept=
 of index and its relationship to the SRGB=E2=80=A6the next bullet says: =E2=80=9C=E2=80=A6the=
 segment is global (the SID is allocated from the SRGB or as an index)=E2=80=9D.&n=
bsp; We now have =E2=80=9Cglobally-unique index=E2=80=9D, =E2=80=9Can index in the SRGB=E2=80=9D, an=
d =E2=80=9Cthe SRGB or as an index=E2=80=9D (separately).<o:p></o:p></p><p class=3DMsoNorm=
al>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMso=
Normal>M6. Section 3.3. (IGP-Anycast Segment, Anycast SID): =E2=80=9C=E2=80=A6the value =
of the SID following the anycast SID MUST be understood by all nodes adverti=
sing the same anycast segment.=E2=80=9D&nbsp; It seems to me that this is really a=
 statement of fact: all nodes, not just ones advertising an anycast segment =
must understand what to do with the next SID=E2=80=A6&nbsp; IOW, s/MUST/must&nbsp;=
 I would even take this sentence out because it is redundant and obvious.<o:=
p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp=
;<o:p></o:p></p><p class=3DMsoNormal>M7. Section 3.4. (IGP-Adjacency Segment, =
Adj-SID) also tries to explain functionality starting from the extensions.<o=
:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M7.1=
. =E2=80=9CThe encodings of the Adj-SID include the a set of flags among which the=
re is the B-flag.&nbsp; When set, the Adj-SID refers to an adjacency that is=
 eligible for protection (e.g.: using IPFRR or MPLS-FRR).=E2=80=9D&nbsp; If the Ad=
jacency Segment is one that is locally significant to the node advertising i=
t, what is the purpose of signaling that it is eligible for protection?&nbsp=
; Wouldn=E2=80=99t that be a local decision as well?&nbsp; Maybe an example of how=
 the architecture is expected to work would help.<o:p></o:p></p><p class=3DMso=
Normal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M7.2. =E2=80=9CThe encodings of the=
 Adj-SID also include the L-flag.&nbsp; When set, the Adj-SID has local sign=
ificance.&nbsp; By default, the L-flag is set.=E2=80=9D&nbsp; The definition of IG=
P-Adjacency Segment already says that it is =E2=80=9Clocal (unless explicitly adve=
rtised otherwise)=E2=80=9D, which makes this statement unnecessary.&nbsp; If you w=
ant to keep it, please figure out a way that doesn=E2=80=99t justify it based on a=
 bit in the extensions.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></=
p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M8. Section 3.5=
. (Binding Segment).&nbsp; A binding segment is not described anywhere in th=
is document =E2=80=93 please do so!&nbsp; Section 3.5.1. (Mapping Server) mentions=
 a =E2=80=9CRemote-Binding SID S advertised by the mapping server=E2=80=9D, and says tha=
t more =E2=80=9Cdetails are described in the SR/LDP interworking procedures ([I-D.=
ietf-spring-segment-routing-ldp-interop]=E2=80=9D, but that draft doesn=E2=80=99t mentio=
n a Binding Segment.&nbsp; Section 5. (IGP Mirroring Context Segment) says t=
hat =E2=80=9Cthe binding segment [is] defined in SR IGP protocol extensions ( [I-D=
.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-exten=
sions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions])=E2=80=9D; however, t=
hose documents don=E2=80=99t mention a Binding Segment, they just (except for the =
OSPFv2 draft) define TLVs.&nbsp; Note that I-D.ietf-ospf-segment-routing-ext=
ensions points back to this document when referring to the definition of a B=
inding SID, completing a circular reference.<o:p></o:p></p><p class=3DMsoNorma=
l>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M8.1. BTW, Section 5. (IGP Mirrori=
ng Context Segment) says that the =E2=80=9CMirror SID is advertised using the bind=
ing segment=E2=80=9D, which then looks like the Mirror Segment is an application o=
f the Binding Segment (+ an explicit indication of it).&nbsp; I think that S=
ection 5 should then be moved to be a sub-section of 3.5.<o:p></o:p></p><p c=
lass=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M8.2. Part of the Sec=
urity Considerations (in Section 8.1) are related to the Binding SID, which =
is another reason for clearly explaining that part of the architecture here.=
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&n=
bsp;<o:p></o:p></p><p class=3DMsoNormal>M9. Section 3.5.1. (Mapping Server) me=
ntions a Mapping Server, but it punts to I-D.ietf-spring-segment-routing-ldp=
-interop for further details.&nbsp; While the SRMS can be used for interoper=
ability cases, I think that it is an important part of the overall architect=
ure and as such it should be described and discussed in this document instea=
d=E2=80=A6including any Manageability Considerations (as mentioned in Section 9).<=
o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nb=
sp;<o:p></o:p></p><p class=3DMsoNormal>M10. Section 3.6. (Inter-Area Considera=
tions) <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNo=
rmal>M10.1. This section shows an example of the behavior: maintain the SID =
across area boundaries.&nbsp; But it doesn=E2=80=99t actually say how the architec=
ture is expected to work.&nbsp; IOW, in the example the SID is maintained, b=
ut should that always happen (MUST, SHOULD)? Or is it just an example (MAY)?=
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M1=
0.2. Another case of explaining the architecture based on the extension func=
tionality: =E2=80=9CWhen an ABR propagates a prefix from one area to another it MU=
ST set the R-Flag.=E2=80=9D&nbsp; Maybe try something like this instead: =E2=80=9CThe re=
-advertisement of an SID that originated on a different IGP area MUST be ind=
icated.=E2=80=9D<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMs=
oNormal>M10.3. [minor] As the advertisement moves to the left (from Area 2 t=
o the Backbone=E2=80=A6), the ABRs change the Node-SID for a Prefix-SID, right?&nb=
sp; The description in the last 3 paragraphs uses Node-SID: =E2=80=9Cnode S=E2=80=A6push=
es Node-SID(150)=E2=80=9D.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><=
p class=3DMsoNormal>M10.4. [minor] Going back to global vs local significance,=
 it would be nice to remind the readers at this point that the SR domain is =
really the whole IGP network, and not just one flooding domain=E2=80=A6which is wh=
y SID 150 can be used throughout.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:=
p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M11. =
Section 4. (BGP Peering Segments) is the only non-IGP focused section in thi=
s document.&nbsp; The architecture of the EPE solution (as described in draf=
t-ietf-spring-segment-routing-central-epe) goes beyond what has already been=
 discussed here because it incorporates elements such as a mandatory central=
ized controller, which was optional before (a PCE server is mentioned only c=
asually in the Terminology section).&nbsp; This leaves us with an incomplete=
 architecture for the BGP case.&nbsp; I would prefer it if the whole archite=
cture was defined in this single document (i.e. expand this section by poten=
tially moving parts from draft-ietf-spring-segment-routing-central-epe =E2=80=93 w=
hich might leave that document without enough content to stand alone).<o:p><=
/o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o=
:p></o:p></p><p class=3DMsoNormal>M12. Section 8. (Security Considerations).&n=
bsp; The main part of this section talks about the instructions on the packe=
ts =E2=80=93 is adding that meta-data a security concern?&nbsp; I think it could b=
e because someone watching could tell which =E2=80=9Cforwarding path elements (e.g=
.: nodes, links, services, etc.)=E2=80=9D are used for specific flows, etc.&nbsp;&=
nbsp; But I also think that the risk is mitigated by the fact that the infor=
mation MUST NOT be exposed outside the SR domain.&nbsp; Mentioning that, and=
 the fact that the SR domain will usually be under a single administration w=
ould be a good thing.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p>=
<p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>M13. Section 9. (=
Manageability Considerations) says that =E2=80=9Can implementation SHOULD protect =
the network in case of conflict detection by providing a deterministic resol=
ution approach=E2=80=A6addressed in [I-D.ietf-spring-conflict-resolution].=E2=80=9D&nbsp=
; That =E2=80=9CSHOULD=E2=80=9D is in conflict with I-D.ietf-spring-conflict-resolution =
(in WGLC) where it says that =E2=80=9CAll protocols which support SR MUST adhere t=
o the policies defined in this document.=E2=80=9D&nbsp; It seems like the easy way=
 forward is to s/SHOULD/MUST.&nbsp; In either case, I think that I-D.ietf-sp=
ring-conflict-resolution should be a Normative reference.<o:p></o:p></p><p c=
lass=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p>=
<p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Minor:<o:p></o:p>=
</p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P1. Introduct=
ion<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal=
>P1.1. The term =E2=80=9Cservice chain=E2=80=9D is used in the Abstract and in the Intro=
duction.&nbsp; Given that the concept is not vital to the architecture and t=
hat there might be unnecessary confusion with SFC, I would suggest taking it=
 out.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNorm=
al>P1.2.&nbsp; Related=E2=80=A6&nbsp; Section 1.1 says that this document =E2=80=9Cdefin=
es=E2=80=A6the service segments=E2=80=9D, but there=E2=80=99s no specific mention of =E2=80=9Cservic=
e segments=E2=80=9D anywhere, except for a very quick mention in Section 5. (IGP M=
irroring Context Segment).&nbsp; What am I missing?&nbsp; Consider taking =E2=80=
=9Cservice segments=E2=80=9D off the list of things this document defines.<o:p></o:p=
></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P1.3. The la=
st paragraph says that =E2=80=9CThis document defines a set of instructions (calle=
d segments) that are required to fulfill the described use-cases.=E2=80=9D&nbsp; T=
he use cases are not mentioned until 1.1.&nbsp; Suggestion: merge Section 1 =
and 1.1 to provide proper flow to the text.<o:p></o:p></p><p class=3DMsoNormal=
>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P1.4. Speaking of use cases, I-D.ie=
tf-spring-oam-usecase doesn=E2=80=99t actually include use cases that will affect =
the architecture.&nbsp; It includes use case of how to use monitoring system=
 defined in it.&nbsp; Same comment for the mention in Section 9.<o:p></o:p><=
/p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o=
:p></p><p class=3DMsoNormal>P2. From Section 2. (Terminology)<o:p></o:p></p><p=
 class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P2.1. SID is not de=
fined, just extended.&nbsp; Besides the examples, please provide an actual d=
efinition.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMs=
oNormal>P2.2. =E2=80=9CThe CONTINUE instruction is implemented as the SWAP instruc=
tion in the MPLS dataplane.=E2=80=9D&nbsp; Please include a reference to where the=
 =E2=80=9CSWAP instruction=E2=80=9D is defined.&nbsp; I assume you=E2=80=99re really referring=
 to =E2=80=9Clabel swapping=E2=80=9D in rfc3031, are you?&nbsp; If so, please be consist=
ent as =E2=80=9CMPLS dataplane=E2=80=9D and =E2=80=9CMPLS architecture=E2=80=9D are used in differen=
t places.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMso=
Normal>P2.3. The =E2=80=9CLocal Segment=E2=80=9D definition says that for IPv6 it =E2=80=9Cis =
not advertised in any routing protocol=E2=80=9D.&nbsp; But for MPLS it is advertis=
ed, right?&nbsp; Please clarify.&nbsp; I think that some of the vocabulary i=
s a little confusing, for example, the definition of IGP-Adjacency Segment s=
ays that it =E2=80=9Cis local (unless explicitly advertised otherwise) to the node=
 that advertises it=E2=80=9D =E2=80=93 this means that for IPv6 this piece of the archit=
ecture wouldn=E2=80=99t apply because a Local Segment is not advertised.&nbsp; To =
add to the confusion, draft-filsfils-spring-srv6-network-programming talks a=
bout local SIDs=E2=80=A6&nbsp; IOW, in some places it sounds as if what should be =
the general architecture only really applies to MPLS =E2=80=93 or maybe we need a =
more explicit local qualifier.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal>P2.4. =E2=80=9CThe PCEP discovery capability is descri=
bed in [I-D.ietf-pce-segment-routing].=E2=80=9D&nbsp; That document doesn=E2=80=99t even=
 mention the word =E2=80=9Cdiscovery=E2=80=9D.&nbsp; Please use the proper name for easi=
er cross-reference.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p=
 class=3DMsoNormal>P2.5. =E2=80=9Cunless explicitly advertised otherwise=E2=80=9D is used =
to qualify the global/local nature of a segment.&nbsp; How do the characteri=
stics of the segment change if =E2=80=9Cexplicitly advertised otherwise=E2=80=9D?&nbsp; =
For example, if an IGP-Prefix Segment is advertised as local, how do its cha=
racteristics change, or do they?<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p=
></o:p></p><p class=3DMsoNormal>P2.5.1. In Section 3.4. (IGP-Adjacency Segment=
, Adj-SID), the use of an Adj-SID is illustrated for both the local and glob=
al cases, but both explanations say the same thing: =E2=80=9Cforwarded along the s=
hortest-path to N and then be switched by N, without any IP shortest-path co=
nsideration, towards link L=E2=80=9D =E2=80=93 I don=E2=80=99t see a difference in behavior be=
tween the local and global nature of this SID.&nbsp; There is some additiona=
l text related to global: =E2=80=9CThe use of global Adj-SID allows to reduce the =
size of the segment list when expressing a path at the cost of additional st=
ate (i.e.: the global Adj-SID will be inserted by all routers within the are=
a in their forwarding table).=E2=80=9D&nbsp; If node N is the one executing on the=
 Adj-SID, how does including it in other FIBs help?<o:p></o:p></p><p class=3DM=
soNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P2.6. None of the segments =
after Section 3.4 (binding, BGP, mirroring) are defined in the Terminology.&=
nbsp; Please do so for completeness.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;=
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P3=
. Referring to Figure 1: =E2=80=9C=E2=80=A6each PE device is connected to two routers in=
 each of the groups A and B.=E2=80=9D&nbsp; The routers connected to the PEs (Rx) =
are not in either group.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p><=
/p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P4. s/Obviousl=
y//&nbsp; <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMs=
oNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P5. Section 3.4. (IGP-Adjace=
ncy Segment, Adj-SID): =E2=80=9CThe remote node MAY be an adjacent IGP neighbor or=
 a non-adjacent neighbor=E2=80=A6=E2=80=9D&nbsp; The =E2=80=9CMAY=E2=80=9D is out of place as there =
isn=E2=80=99t another option, it is one or the other.&nbsp; s/MAY/may<o:p></o:p></=
p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:=
p></p><p class=3DMsoNormal>P6. Maybe it=E2=80=99s because the rest of 3.5 is incompl=
ete, but Section 3.5.2. (Tunnel Head-end) has no context to speak of =E2=80=93 wit=
hout that, it feels like an orphan section.<o:p></o:p></p><p class=3DMsoNormal=
>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNo=
rmal>P7. Section 8.1. (MPLS Data Plane)<o:p></o:p></p><p class=3DMsoNormal>&nb=
sp;<o:p></o:p></p><p class=3DMsoNormal>P7.1. You included a couple of referenc=
es at the end of this section, which is good.&nbsp; I would however not expl=
icitly mention specific sections, as the whole RFCs (rfc4381 and rfc5920) ar=
e about MPLS-related security.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal>P7.2. You compare the use of a single segment to=
 RSVP-TE =E2=80=93 if the security characteristics are similar, please provide a r=
eference.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMso=
Normal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P8. References<o:p></o:p></p>=
<p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P8.1. RFC2460 was=
 obsoleted by RFC8200 / RFC6822 was obsoleted by RFC8202<o:p></o:p></p><p cl=
ass=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>P8.2. I think that the=
 reference to RFC4206 should be Informative.<o:p></o:p></p><p class=3DMsoNorma=
l>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoN=
ormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Nits:<o:p></o:p></p><p class=3DM=
soNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N1. The Abstract is very lo=
ng =E2=80=93 I would even say too long.&nbsp; If it was up to me, I would leave ju=
st the first paragraph.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></=
p><p class=3DMsoNormal>N2. The second to last paragraph in the Introduction (=E2=
=80=9CNumerous use-cases=E2=80=A6=E2=80=9D) references the =E2=80=9Cmarketing style=E2=80=9D content of =
I-D.ietf-spring-oam-usecase.&nbsp; I have asked the authors of that document=
 to please focus their content.&nbsp; Please consider taking this paragraph =
out.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNorma=
l>N3. s/participating into the source based/participating in the source base=
d<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N=
4. References.&nbsp; Please add Informative references to netconf (Section 2=
), PCEP (2), FRR (3.1.1), =E2=80=9Cparallel adjacency suppression=E2=80=9D (3.4).<o:p></=
o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N5. Secti=
on 3: =E2=80=9CIGP segments require extensions in link-state IGP protocols.&nbsp; =
IGP extensions are required in order to advertise the IGP segments.=E2=80=9D&nbsp;=
 These 2 sentences say the exact same thing.&nbsp; <o:p></o:p></p><p class=3DM=
soNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N6. Please avoid using =E2=80=9Cw=
e=E2=80=9D in the text =E2=80=93 except for the Acknowledgements.<o:p></o:p></p><p class=
=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N7. s/Regardless Segment =
Routing/Independent of Segment Routing<o:p></o:p></p><p class=3DMsoNormal>&nbs=
p;<o:p></o:p></p><p class=3DMsoNormal>N8. s/and not to each other individual n=
odes in the LAN/and not to individual nodes in the LAN<o:p></o:p></p><p clas=
s=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N9. s/([I-D.ietf-spring-=
segment-routing-ldp-interop]/[I-D.ietf-spring-segment-routing-ldp-interop]<o=
:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>N10.=
 =E2=80=9CIGP deployed using areas=E2=80=9D&nbsp; An area is an OSPF-specific construct =
=E2=80=93 flooding domain is more generic.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;=
<o:p></o:p></p><p class=3DMsoNormal>N11. It would be nice if the examples used=
 IPv6 instead of IPv4.<o:p></o:p></p></div></body></html>

--B_3590501725_2045694134--



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Hi Alvaro, Martin, Bruno,

Sorry for the long delay=2E=20

The authors are working on the different reviews and will address all comm=
ents before next meeting=2E=20

Thanks=2E

s=2E

On October 10, 2017 11:35:24 PM GMT+02:00, Alvaro Retana <aretana=2Eietf@g=
mail=2Ecom> wrote:
>Dear authors:
>
>=20
>
>Hi!
>
>=20
>
>It=E2=80=99s been 2 months since I sent out this review and I still haven=
=E2=80=99t
>heard anything back (not even an ACK!) from you=2E=C2=A0 What is the plan=
 to
>address the comments and move this work forward?
>
>=20
>
>Thanks!
>
>=20
>
>Alvaro=2E
>
>=20
>
>From: spring <spring-bounces@ietf=2Eorg> on behalf of Alvaro Retana
><aretana@cisco=2Ecom>
>Date: Thursday, August 10, 2017 at 3:00 PM
>To: "draft-ietf-spring-segment-routing@ietf=2Eorg"
><draft-ietf-spring-segment-routing@ietf=2Eorg>
>Cc: "spring-chairs@ietf=2Eorg" <spring-chairs@ietf=2Eorg>,
>"spring@ietf=2Eorg" <spring@ietf=2Eorg>, Martin Vigoureux
><martin=2Evigoureux@nokia=2Ecom>
>Subject: [spring] AD Review of draft-ietf-spring-segment-routing-12
>
>=20
>
>Dear authors:
>
>=20
>
>I just finished reviewing this document =E2=80=93 sorry for the delay in
>processing=2E  Thanks for all the work you=E2=80=99ve but into this docum=
ent!
>
>=20
>
>I have some significant concerns (see below for details)=2E  In general,
>the document presents an incomplete view of the architecture: details
>about important pieces are barely mentioned or not fully described, as
>is the case of the role of a central controller (PCE), and the BGP and
>Binding Segments=2E =20
>
>=20
>
>Also, some of the architectural details are predicated on specific bits
>defined in the extensions, where this document should describe the
>general operation and leave the details (like bit names) to the
>extensions=2E  Note that I=E2=80=99m not asking that you don=E2=80=99t me=
ntion the
>extensions =E2=80=93 pointing to them is fine --, I=E2=80=99m asking you =
to define the
>functionality in general and not as a function of the extensions=2E  For
>an example, see point M5=2E1=2E below=2E
>
>=20
>
>I will wait for at least the Major comments to be addressed before
>starting the IETF Last Call=2E
>
>=20
>
>Thanks!
>
>=20
>
>Alvaro=2E
>
>=20
>
>=20
>
>=20
>
>Major:
>
>=20
>
>M1=2E The Introduction mentions several types of segments, and it says
>that the LDP LSP, RSVP-TE LSP, and BGP LSP segments are =E2=80=9Cillustra=
ted in
>[I-D=2Eietf-spring-segment-routing-mpls]=E2=80=9D=2E  But that is only tr=
ue for the
>first two, for which examples are shown=2E  Where are these segment types
>defined?  The definition, and not the examples, is the Major issue
>here=2E  This document being the main architecture document should
>include the complete description=2E  BTW, the list is only about the
>=E2=80=9CMPLS instantiation=E2=80=9D, are there similar types of segments=
 for IP?
>
>=20
>
>=20
>
>M2=2E From Section 2=2E (Terminology): =E2=80=9CUsing the same SRGB on al=
l nodes
>within the SR domain ease operations and troubleshooting and is
>expected to be a deployment guideline=2E=E2=80=9D  It is =E2=80=9Cexpecte=
d to be a
>deployment guideline=E2=80=9D where/when??  Given that this document is t=
he
>general architecture, I figured that maybe
>draft-ietf-spring-segment-routing-mpls contained that deployment
>recommendation, but all that document says is: =E2=80=9CAs described in
>[I-D=2Eietf-spring-segment-routing], using the same SRGB on all nodes
>within the SR domain eases operations and troubleshooting and is
>expected to be a deployment guideline=2E=E2=80=9D  So=E2=80=A6where are t=
he
>Deployment/Operational considerations related to the SRGB?  I note that
>neither document (draft-ietf-spring-segment-routing or
>draft-ietf-spring-segment-routing-mpls) include them=2E  I would expect
>some information to be in this (general) document and other more
>specific information (like the considerations about using the same
>SRGB) to be in the more specific document
>(draft-ietf-spring-segment-routing-mpls, in this case)=2E
>
>=20
>
>M2=2E1=2E  The example illustrated in Figure 2 would be a great place to
>demonstrate the value of having the same SRGB=2E  In fact, the text now
>shows things not working and it even warns by saying that =E2=80=9Cusing
>anycast segment without configuring the same SRGB on nodes belonging to
>the same device group may lead to misrouting=E2=80=9D, but no explanation=
 of
>how it should be done the right way=2E
>
>=20
>
>=20
>
>M3=2E From Section 2=2E (Terminology): =E2=80=9C=E2=80=A6a global segment=
 is represented by
>a globally-unique index=2E=E2=80=9D =20
>
>=20
>
>M3=2E1=2E  I couldn=E2=80=99t find anywhere a discussion about the use of=
 the
>index=2E  When it is discussed in 3=2E1=2E2, it seems to be an understood
>concept: =E2=80=9CA Prefix-SID is allocated in the form of an index in th=
e
>SRGB=E2=80=A6=E2=80=9D  Even if straightforward, I think the concept of t=
he index
>should be explained (maybe with an example) and not assumed=2E  I again
>went to look at draft-ietf-spring-segment-routing-mpls, but that
>document just points back to this one: =E2=80=9CThe notion of indexed glo=
bal
>segment, defined in [I-D=2Eietf-spring-segment-routing]=E2=80=A6=E2=80=9D=
=20
>
>=20
>
>M3=2E2=2E I assume that =E2=80=9Cglobally-unique index=E2=80=9D is really=
 unique to the SR
>Domain, right?  I ask this question because =E2=80=9Cglobally-unique IPv6
>address=E2=80=9D has a different connotation (as in unique world-wide, no=
t just
>inside a domain)=2E  Please clarify=2E
>
>=20
>
>M3=2E3=2E  Note that the latest version (-10) of
>draft-ietf-spring-segment-routing-mpls introduced the SR Local Block
>(SRLB) which is not defined in this document=2E  I mention it here
>because it was introduced right after the pointer about the index=E2=80=
=A6
>
>=20
>
>=20
>
>M4=2E Section 3=2E1=2E1=2E (Prefix-SID Algorithm)
>
>=20
>
>M4=2E1=2E This section starts by justifying the use of an algorithm based
>on the IGP protocol extensions: the extensions have an algorithm field,
>so we should use it=2E  The justification should be the other way around:
>this document (the architecture) defines the concept of an algorithm
>and the extensions implement it=2E  Please re-word the first 3 paragraphs
>=E2=80=93 note that the instance/topology references seem superfluous to =
me=2E
>
>=20
>
>M4=2E2=2E The algorithms are not really defined =E2=80=93 there are menti=
ons of a
>=E2=80=9Cwell known ECMP-aware SPF algorithm=E2=80=9D, but no specific re=
ference to
>what that is=2E  The last sentence in the Section mentions that the
>=E2=80=9Cdetails of the two defined algorithms are defined in=E2=80=A6=E2=
=80=9D pointing to the
>extension drafts =E2=80=93 but those drafts just offer an additional piec=
e of
>information in (from the OSPF document): =E2=80=9Cthe standard shortest p=
ath
>algorithm as computed by the OSPF protocol=E2=80=9D=2E  Ideally the algor=
ithms
>would be defined here (even if it is just to say: =E2=80=9Cthe standard
>algorithm used in the corresponding IGP=E2=80=9D), and the extensions wou=
ld
>just reference it=2E=20
>
>=20
>
>M4=2E3=2E  When should the packets be dropped??  The following text point=
s
>to at least 3 different places where it should be dropped, one marked
>with a MUST=2E  Please clarify=2E
>
>=20
>
>M4=2E3=2E1=2E =E2=80=9CA router MUST drop any SR traffic associated with =
the SR
>algorithm to the adjacent router, if the adjacent router has not
>advertised support for such SR algorithm=2E=E2=80=9D  Ok, this sounds as =
if the
>traffic is dropped one hop before the router not supporting the
>algorithm =E2=80=93 and it has a MUST in it=2E
>
>=20
>
>M4=2E3=2E2=2E =E2=80=9CThe ingress node of an SR domain validates that th=
e path to a
>prefix=E2=80=A6includes nodes all supporting the advertised algorithm=2E =
 As a
>consequence, if a node on the path does not support algorithm X, the
>IGP-Prefix segment will be interrupted and will drop packet on that
>node=2E=E2=80=9D  This sounds like the traffic would be dropped on the no=
de not
>supporting the algorithm=2E
>
>=20
>
>M4=2E3=2E3=2E =E2=80=9CIt's the responsibility of the ingress node using =
a segment to
>check that all downstream nodes support the algorithm of the segment=2E=
=E2=80=9D=20
>This last sentence hints at the fact that the ingress node should maybe
>even stop the traffic there, or maybe not sending it unless all nodes
>in the path support the same algorithm=E2=80=A6
>
>=20
>
>=20
>
>M5=2E Section 3=2E1=2E2=2E (MPLS Dataplane)=2E =20
>
>=20
>
>M5=2E1=2E The first bullet (again!) explains the architecture in function
>of the extensions=2E  The architecture should explain what needs to be
>done and the extensions would then do it=E2=80=A6  Suggestion:
>
>=20
>
>NEW>
>
>   In order to achieve a behavior equivalent to Penultimate Hop Popping
>
>  in MPLS [Reference], a Node N advertising a Prefix-SID SID-R for its=20
>
> attached prefix R MUST be able to instruct its connected neighbors to=20
>
>   perform the NEXT operation while processing SID-R=2E  Upon receiving=
=20
>
> this instruction from Node N, its neighbors of N MUST perform the NEXT
>
>  operation while processing SID-R=2E  Alternatively, the neighbors of N=
=20
>
>   MUST perform the CONTINUE operation while processing SID-R=2E
>
>=20
>
>M5=2E1=2E1=2E The penultimate bullet refers again to the extensions (but =
it
>only mentions the P-bit this time)=2E  Please explain what the
>architecture intends to do, but not from the point of view of the
>extensions=2E  This and the last bullet seem to be the result of the
>first one (above)=2E  I think that the first bullet would have enough
>text for the FIB entries to be obvious, but if you want to include this
>corollary, please do it right after=2E
>
>=20
>
>M5=2E2=2E =E2=80=9CA Prefix-SID is allocated in the form of an index in t=
he SRGB
>(or as a local MPLS label) according to a process similar to IP address
>allocation=2E=E2=80=9D  The SRGB is defined (in the Terminology section) =
as =E2=80=9Cthe
>set of local labels reserved for global segments=E2=80=9D, what is the
>difference between =E2=80=9Can index in the SRGB=E2=80=9D and =E2=80=9Ca =
local MPLS label=E2=80=9D?=20
>I=E2=80=99m hoping that the explanation of the concept of index would cla=
rify
>this=2E
>
>=20
>
>M5=2E2=2E1=2E Three bullets down=E2=80=A6 =E2=80=9CIf a node learns a Pre=
fix-SID having a
>value that falls outside the locally configured SRGB range, then the
>node MUST NOT use the Prefix-SID=E2=80=A6=E2=80=9D  Going back to my prev=
ious question:
>it looks like =E2=80=9Ca local MPLS label=E2=80=9D would have to be inclu=
ded in the
>SRGB =E2=80=93 again, clarifying upfront would help a lot=2E  Note that t=
his
>piece of text falls into the recommendation of having the same SRGB
>configured in all nodes=2E
>
>=20
>
>M5=2E2=2E2=2E  Related to the concept of index and its relationship to th=
e
>SRGB=E2=80=A6the next bullet says: =E2=80=9C=E2=80=A6the segment is globa=
l (the SID is
>allocated from the SRGB or as an index)=E2=80=9D=2E  We now have =E2=80=
=9Cglobally-unique
>index=E2=80=9D, =E2=80=9Can index in the SRGB=E2=80=9D, and =E2=80=9Cthe =
SRGB or as an index=E2=80=9D
>(separately)=2E
>
>=20
>
>=20
>
>M6=2E Section 3=2E3=2E (IGP-Anycast Segment, Anycast SID): =E2=80=9C=E2=
=80=A6the value of the
>SID following the anycast SID MUST be understood by all nodes
>advertising the same anycast segment=2E=E2=80=9D  It seems to me that thi=
s is
>really a statement of fact: all nodes, not just ones advertising an
>anycast segment must understand what to do with the next SID=E2=80=A6  IO=
W,
>s/MUST/must  I would even take this sentence out because it is
>redundant and obvious=2E
>
>=20
>
>=20
>
>M7=2E Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID) also tries to exp=
lain
>functionality starting from the extensions=2E
>
>=20
>
>M7=2E1=2E =E2=80=9CThe encodings of the Adj-SID include the a set of flag=
s among
>which there is the B-flag=2E  When set, the Adj-SID refers to an
>adjacency that is eligible for protection (e=2Eg=2E: using IPFRR or
>MPLS-FRR)=2E=E2=80=9D  If the Adjacency Segment is one that is locally
>significant to the node advertising it, what is the purpose of
>signaling that it is eligible for protection?  Wouldn=E2=80=99t that be a=
 local
>decision as well?  Maybe an example of how the architecture is expected
>to work would help=2E
>
>=20
>
>M7=2E2=2E =E2=80=9CThe encodings of the Adj-SID also include the L-flag=
=2E  When set,
>the Adj-SID has local significance=2E  By default, the L-flag is set=2E=
=E2=80=9D=20
>The definition of IGP-Adjacency Segment already says that it is =E2=80=9C=
local
>(unless explicitly advertised otherwise)=E2=80=9D, which makes this state=
ment
>unnecessary=2E  If you want to keep it, please figure out a way that
>doesn=E2=80=99t justify it based on a bit in the extensions=2E
>
>=20
>
>=20
>
>M8=2E Section 3=2E5=2E (Binding Segment)=2E  A binding segment is not des=
cribed
>anywhere in this document =E2=80=93 please do so!  Section 3=2E5=2E1=2E (=
Mapping
>Server) mentions a =E2=80=9CRemote-Binding SID S advertised by the mappin=
g
>server=E2=80=9D, and says that more =E2=80=9Cdetails are described in the=
 SR/LDP
>interworking procedures
>([I-D=2Eietf-spring-segment-routing-ldp-interop]=E2=80=9D, but that draft=
 doesn=E2=80=99t
>mention a Binding Segment=2E  Section 5=2E (IGP Mirroring Context Segment=
)
>says that =E2=80=9Cthe binding segment [is] defined in SR IGP protocol
>extensions ( [I-D=2Eietf-isis-segment-routing-extensions],
>[I-D=2Eietf-ospf-segment-routing-extensions] and
>[I-D=2Eietf-ospf-ospfv3-segment-routing-extensions])=E2=80=9D; however, t=
hose
>documents don=E2=80=99t mention a Binding Segment, they just (except for =
the
>OSPFv2 draft) define TLVs=2E  Note that
>I-D=2Eietf-ospf-segment-routing-extensions points back to this document
>when referring to the definition of a Binding SID, completing a
>circular reference=2E
>
>=20
>
>M8=2E1=2E BTW, Section 5=2E (IGP Mirroring Context Segment) says that the
>=E2=80=9CMirror SID is advertised using the binding segment=E2=80=9D, whi=
ch then looks
>like the Mirror Segment is an application of the Binding Segment (+ an
>explicit indication of it)=2E  I think that Section 5 should then be
>moved to be a sub-section of 3=2E5=2E
>
>=20
>
>M8=2E2=2E Part of the Security Considerations (in Section 8=2E1) are rela=
ted
>to the Binding SID, which is another reason for clearly explaining that
>part of the architecture here=2E
>
>=20
>
>=20
>
>M9=2E Section 3=2E5=2E1=2E (Mapping Server) mentions a Mapping Server, bu=
t it
>punts to I-D=2Eietf-spring-segment-routing-ldp-interop for further
>details=2E  While the SRMS can be used for interoperability cases, I
>think that it is an important part of the overall architecture and as
>such it should be described and discussed in this document
>instead=E2=80=A6including any Manageability Considerations (as mentioned =
in
>Section 9)=2E
>
>=20
>
>=20
>
>M10=2E Section 3=2E6=2E (Inter-Area Considerations)=20
>
>=20
>
>M10=2E1=2E This section shows an example of the behavior: maintain the SI=
D
>across area boundaries=2E  But it doesn=E2=80=99t actually say how the
>architecture is expected to work=2E  IOW, in the example the SID is
>maintained, but should that always happen (MUST, SHOULD)? Or is it just
>an example (MAY)?
>
>=20
>
>M10=2E2=2E Another case of explaining the architecture based on the
>extension functionality: =E2=80=9CWhen an ABR propagates a prefix from on=
e area
>to another it MUST set the R-Flag=2E=E2=80=9D  Maybe try something like t=
his
>instead: =E2=80=9CThe re-advertisement of an SID that originated on a dif=
ferent
>IGP area MUST be indicated=2E=E2=80=9D
>
>=20
>
>M10=2E3=2E [minor] As the advertisement moves to the left (from Area 2 to
>the Backbone=E2=80=A6), the ABRs change the Node-SID for a Prefix-SID, ri=
ght?=20
>The description in the last 3 paragraphs uses Node-SID: =E2=80=9Cnode S=
=E2=80=A6pushes
>Node-SID(150)=E2=80=9D=2E
>
>=20
>
>M10=2E4=2E [minor] Going back to global vs local significance, it would b=
e
>nice to remind the readers at this point that the SR domain is really
>the whole IGP network, and not just one flooding domain=E2=80=A6which is =
why
>SID 150 can be used throughout=2E
>
>=20
>
>=20
>
>M11=2E Section 4=2E (BGP Peering Segments) is the only non-IGP focused
>section in this document=2E  The architecture of the EPE solution (as
>described in draft-ietf-spring-segment-routing-central-epe) goes beyond
>what has already been discussed here because it incorporates elements
>such as a mandatory centralized controller, which was optional before
>(a PCE server is mentioned only casually in the Terminology section)=2E=
=20
>This leaves us with an incomplete architecture for the BGP case=2E  I
>would prefer it if the whole architecture was defined in this single
>document (i=2Ee=2E expand this section by potentially moving parts from
>draft-ietf-spring-segment-routing-central-epe =E2=80=93 which might leave=
 that
>document without enough content to stand alone)=2E
>
>=20
>
>=20
>
>M12=2E Section 8=2E (Security Considerations)=2E  The main part of this
>section talks about the instructions on the packets =E2=80=93 is adding t=
hat
>meta-data a security concern?  I think it could be because someone
>watching could tell which =E2=80=9Cforwarding path elements (e=2Eg=2E: no=
des,
>links, services, etc=2E)=E2=80=9D are used for specific flows, etc=2E   B=
ut I also
>think that the risk is mitigated by the fact that the information MUST
>NOT be exposed outside the SR domain=2E  Mentioning that, and the fact
>that the SR domain will usually be under a single administration would
>be a good thing=2E
>
>=20
>
>=20
>
>M13=2E Section 9=2E (Manageability Considerations) says that =E2=80=9Can
>implementation SHOULD protect the network in case of conflict detection
>by providing a deterministic resolution approach=E2=80=A6addressed in
>[I-D=2Eietf-spring-conflict-resolution]=2E=E2=80=9D  That =E2=80=9CSHOULD=
=E2=80=9D is in conflict
>with I-D=2Eietf-spring-conflict-resolution (in WGLC) where it says that
>=E2=80=9CAll protocols which support SR MUST adhere to the policies defin=
ed in
>this document=2E=E2=80=9D  It seems like the easy way forward is to
>s/SHOULD/MUST=2E  In either case, I think that
>I-D=2Eietf-spring-conflict-resolution should be a Normative reference=2E
>
>=20
>
>=20
>
>=20
>
>Minor:
>
>=20
>
>P1=2E Introduction
>
>=20
>
>P1=2E1=2E The term =E2=80=9Cservice chain=E2=80=9D is used in the Abstrac=
t and in the
>Introduction=2E  Given that the concept is not vital to the architecture
>and that there might be unnecessary confusion with SFC, I would suggest
>taking it out=2E
>
>=20
>
>P1=2E2=2E  Related=E2=80=A6  Section 1=2E1 says that this document =E2=80=
=9Cdefines=E2=80=A6the
>service segments=E2=80=9D, but there=E2=80=99s no specific mention of =E2=
=80=9Cservice
>segments=E2=80=9D anywhere, except for a very quick mention in Section 5=
=2E (IGP
>Mirroring Context Segment)=2E  What am I missing?  Consider taking
>=E2=80=9Cservice segments=E2=80=9D off the list of things this document d=
efines=2E
>
>=20
>
>P1=2E3=2E The last paragraph says that =E2=80=9CThis document defines a s=
et of
>instructions (called segments) that are required to fulfill the
>described use-cases=2E=E2=80=9D  The use cases are not mentioned until 1=
=2E1=2E=20
>Suggestion: merge Section 1 and 1=2E1 to provide proper flow to the text=
=2E
>
>=20
>
>P1=2E4=2E Speaking of use cases, I-D=2Eietf-spring-oam-usecase doesn=E2=
=80=99t
>actually include use cases that will affect the architecture=2E  It
>includes use case of how to use monitoring system defined in it=2E  Same
>comment for the mention in Section 9=2E
>
>=20
>
>=20
>
>P2=2E From Section 2=2E (Terminology)
>
>=20
>
>P2=2E1=2E SID is not defined, just extended=2E  Besides the examples, ple=
ase
>provide an actual definition=2E
>
>=20
>
>P2=2E2=2E =E2=80=9CThe CONTINUE instruction is implemented as the SWAP in=
struction
>in the MPLS dataplane=2E=E2=80=9D  Please include a reference to where th=
e =E2=80=9CSWAP
>instruction=E2=80=9D is defined=2E  I assume you=E2=80=99re really referr=
ing to =E2=80=9Clabel
>swapping=E2=80=9D in rfc3031, are you?  If so, please be consistent as =
=E2=80=9CMPLS
>dataplane=E2=80=9D and =E2=80=9CMPLS architecture=E2=80=9D are used in di=
fferent places=2E
>
>=20
>
>P2=2E3=2E The =E2=80=9CLocal Segment=E2=80=9D definition says that for IP=
v6 it =E2=80=9Cis not
>advertised in any routing protocol=E2=80=9D=2E  But for MPLS it is advert=
ised,
>right?  Please clarify=2E  I think that some of the vocabulary is a
>little confusing, for example, the definition of IGP-Adjacency Segment
>says that it =E2=80=9Cis local (unless explicitly advertised otherwise) t=
o the
>node that advertises it=E2=80=9D =E2=80=93 this means that for IPv6 this =
piece of the
>architecture wouldn=E2=80=99t apply because a Local Segment is not advert=
ised=2E=20
>To add to the confusion, draft-filsfils-spring-srv6-network-programming
>talks about local SIDs=E2=80=A6  IOW, in some places it sounds as if what
>should be the general architecture only really applies to MPLS =E2=80=93 =
or
>maybe we need a more explicit local qualifier=2E
>
>=20
>
>P2=2E4=2E =E2=80=9CThe PCEP discovery capability is described in
>[I-D=2Eietf-pce-segment-routing]=2E=E2=80=9D  That document doesn=E2=80=
=99t even mention
>the word =E2=80=9Cdiscovery=E2=80=9D=2E  Please use the proper name for e=
asier
>cross-reference=2E
>
>=20
>
>P2=2E5=2E =E2=80=9Cunless explicitly advertised otherwise=E2=80=9D is use=
d to qualify the
>global/local nature of a segment=2E  How do the characteristics of the
>segment change if =E2=80=9Cexplicitly advertised otherwise=E2=80=9D?  For=
 example, if
>an IGP-Prefix Segment is advertised as local, how do its
>characteristics change, or do they?
>
>=20
>
>P2=2E5=2E1=2E In Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID), the u=
se of an
>Adj-SID is illustrated for both the local and global cases, but both
>explanations say the same thing: =E2=80=9Cforwarded along the shortest-pa=
th to
>N and then be switched by N, without any IP shortest-path
>consideration, towards link L=E2=80=9D =E2=80=93 I don=E2=80=99t see a di=
fference in behavior
>between the local and global nature of this SID=2E  There is some
>additional text related to global: =E2=80=9CThe use of global Adj-SID all=
ows to
>reduce the size of the segment list when expressing a path at the cost
>of additional state (i=2Ee=2E: the global Adj-SID will be inserted by all
>routers within the area in their forwarding table)=2E=E2=80=9D  If node N=
 is the
>one executing on the Adj-SID, how does including it in other FIBs help?
>
>=20
>
>P2=2E6=2E None of the segments after Section 3=2E4 (binding, BGP, mirrori=
ng)
>are defined in the Terminology=2E  Please do so for completeness=2E
>
>=20
>
>=20
>
>P3=2E Referring to Figure 1: =E2=80=9C=E2=80=A6each PE device is connecte=
d to two routers
>in each of the groups A and B=2E=E2=80=9D  The routers connected to the P=
Es (Rx)
>are not in either group=2E
>
>=20
>
>=20
>
>P4=2E s/Obviously// =20
>
>=20
>
>=20
>
>P5=2E Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID): =E2=80=9CThe rem=
ote node MAY
>be an adjacent IGP neighbor or a non-adjacent neighbor=E2=80=A6=E2=80=9D =
 The =E2=80=9CMAY=E2=80=9D is
>out of place as there isn=E2=80=99t another option, it is one or the othe=
r=2E=20
>s/MAY/may
>
>=20
>
>=20
>
>P6=2E Maybe it=E2=80=99s because the rest of 3=2E5 is incomplete, but Sec=
tion
>3=2E5=2E2=2E (Tunnel Head-end) has no context to speak of =E2=80=93 witho=
ut that, it
>feels like an orphan section=2E
>
>=20
>
>=20
>
>P7=2E Section 8=2E1=2E (MPLS Data Plane)
>
>=20
>
>P7=2E1=2E You included a couple of references at the end of this section,
>which is good=2E  I would however not explicitly mention specific
>sections, as the whole RFCs (rfc4381 and rfc5920) are about
>MPLS-related security=2E
>
>=20
>
>P7=2E2=2E You compare the use of a single segment to RSVP-TE =E2=80=93 if=
 the
>security characteristics are similar, please provide a reference=2E
>
>=20
>
>=20
>
>P8=2E References
>
>=20
>
>P8=2E1=2E RFC2460 was obsoleted by RFC8200 / RFC6822 was obsoleted by
>RFC8202
>
>=20
>
>P8=2E2=2E I think that the reference to RFC4206 should be Informative=2E
>
>=20
>
>=20
>
>=20
>
>Nits:
>
>=20
>
>N1=2E The Abstract is very long =E2=80=93 I would even say too long=2E  I=
f it was
>up to me, I would leave just the first paragraph=2E
>
>=20
>
>N2=2E The second to last paragraph in the Introduction (=E2=80=9CNumerous
>use-cases=E2=80=A6=E2=80=9D) references the =E2=80=9Cmarketing style=E2=
=80=9D content of
>I-D=2Eietf-spring-oam-usecase=2E  I have asked the authors of that docume=
nt
>to please focus their content=2E  Please consider taking this paragraph
>out=2E
>
>=20
>
>N3=2E s/participating into the source based/participating in the source
>based
>
>=20
>
>N4=2E References=2E  Please add Informative references to netconf (Sectio=
n
>2), PCEP (2), FRR (3=2E1=2E1), =E2=80=9Cparallel adjacency suppression=E2=
=80=9D (3=2E4)=2E
>
>=20
>
>N5=2E Section 3: =E2=80=9CIGP segments require extensions in link-state I=
GP
>protocols=2E  IGP extensions are required in order to advertise the IGP
>segments=2E=E2=80=9D  These 2 sentences say the exact same thing=2E =20
>
>=20
>
>N6=2E Please avoid using =E2=80=9Cwe=E2=80=9D in the text =E2=80=93 excep=
t for the
>Acknowledgements=2E
>
>=20
>
>N7=2E s/Regardless Segment Routing/Independent of Segment Routing
>
>=20
>
>N8=2E s/and not to each other individual nodes in the LAN/and not to
>individual nodes in the LAN
>
>=20
>
>N9=2E
>s/([I-D=2Eietf-spring-segment-routing-ldp-interop]/[I-D=2Eietf-spring-seg=
ment-routing-ldp-interop]
>
>=20
>
>N10=2E =E2=80=9CIGP deployed using areas=E2=80=9D  An area is an OSPF-spe=
cific construct
>=E2=80=93 flooding domain is more generic=2E
>
>=20
>
>N11=2E It would be nice if the examples used IPv6 instead of IPv4=2E

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--></style></head><body bgcolor=3D"white" lang=3D"EN-US" link=3D"#0563C1" =
vlink=3D"#954F72">Hi Alvaro, Martin, Bruno,<br>
<br>
Sorry for the long delay=2E <br>
<br>
The authors are working on the different reviews and will address all comm=
ents before next meeting=2E <br>
<br>
Thanks=2E<br>
<br>
s=2E<br><br><div class=3D"gmail_quote">On October 10, 2017 11:35:24 PM GMT=
+02:00, Alvaro Retana &lt;aretana=2Eietf@gmail=2Ecom&gt; wrote:<blockquote =
class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0=2E8ex; border-left: 1p=
x solid rgb(204, 204, 204); padding-left: 1ex;">
<div class=3D"WordSection1"><p class=3D"MsoNormal"><span style=3D"font-siz=
e:11=2E0pt">Dear authors:<p></p></span></p><p class=3D"MsoNormal"><span sty=
le=3D"font-size:11=2E0pt"><p>&nbsp;</p></span></p><p class=3D"MsoNormal"><s=
pan style=3D"font-size:11=2E0pt">Hi!<p></p></span></p><p class=3D"MsoNormal=
"><span style=3D"font-size:11=2E0pt"><p>&nbsp;</p></span></p><p class=3D"Ms=
oNormal"><span style=3D"font-size:11=2E0pt">It&rsquo;s been 2 months since =
I sent out this review and I still haven&rsquo;t heard anything back (not e=
ven an ACK!) from you=2E&nbsp; What is the plan to address the comments and=
 move this work forward?<p></p></span></p><p class=3D"MsoNormal"><span styl=
e=3D"font-size:11=2E0pt"><p>&nbsp;</p></span></p><p class=3D"MsoNormal"><sp=
an style=3D"font-size:11=2E0pt">Thanks!<p></p></span></p><p class=3D"MsoNor=
mal"><span style=3D"font-size:11=2E0pt"><p>&nbsp;</p></span></p><p class=3D=
"MsoNormal"><span style=3D"font-size:11=2E0pt">Alvaro=2E<p></p></span></p><=
p class=3D"MsoNormal"><span style=3D"font-size:11=2E0pt"><p>&nbsp;</p></spa=
n></p><div style=3D"border:none;border-top:solid #B5C4DF 1=2E0pt;padding:3=
=2E0pt 0in 0in 0in"><p class=3D"MsoNormal"><b><span style=3D"color:black">F=
rom: </span></b><span style=3D"color:black">spring &lt;spring-bounces@ietf=
=2Eorg&gt; on behalf of Alvaro Retana &lt;aretana@cisco=2Ecom&gt;<br /><b>D=
ate: </b>Thursday, August 10, 2017 at 3:00 PM<br /><b>To: </b>&quot;draft-i=
etf-spring-segment-routing@ietf=2Eorg&quot; &lt;draft-ietf-spring-segment-r=
outing@ietf=2Eorg&gt;<br /><b>Cc: </b>&quot;spring-chairs@ietf=2Eorg&quot; =
&lt;spring-chairs@ietf=2Eorg&gt;, &quot;spring@ietf=2Eorg&quot; &lt;spring@=
ietf=2Eorg&gt;, Martin Vigoureux &lt;martin=2Evigoureux@nokia=2Ecom&gt;<br =
/><b>Subject: </b>[spring] AD Review of draft-ietf-spring-segment-routing-1=
2<p></p></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-si=
ze:11=2E0pt"><p>&nbsp;</p></span></p></div><p class=3D"MsoNormal">Dear auth=
ors:</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorma=
l">I just finished reviewing this document &ndash; sorry for the delay in p=
rocessing=2E&nbsp; Thanks for all the work you&rsquo;ve but into this docum=
ent!</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorma=
l">I have some significant concerns (see below for details)=2E&nbsp; In gen=
eral, the document presents an incomplete view of the architecture: details=
 about important pieces are barely mentioned or not fully described, as is =
the case of the role of a central controller (PCE), and the BGP and Binding=
 Segments=2E&nbsp; </p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p cl=
ass=3D"MsoNormal">Also, some of the architectural details are predicated on=
 specific bits defined in the extensions, where this document should descri=
be the general operation and leave the details (like bit names) to the exte=
nsions=2E&nbsp; Note that I&rsquo;m not asking that you don&rsquo;t mention=
 the extensions &ndash; pointing to them is fine --, I&rsquo;m asking you t=
o define the functionality in general and not as a function of the extensio=
ns=2E&nbsp; For an example, see point M5=2E1=2E below=2E</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">I will wait for at l=
east the Major comments to be addressed before starting the IETF Last Call=
=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal=
">Thanks!</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"Mso=
Normal">Alvaro=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p clas=
s=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p=
 class=3D"MsoNormal">Major:</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p><=
/p><p class=3D"MsoNormal">M1=2E The Introduction mentions several types of =
segments, and it says that the LDP LSP, RSVP-TE LSP, and BGP LSP segments a=
re &ldquo;illustrated in [I-D=2Eietf-spring-segment-routing-mpls]&rdquo;=2E=
&nbsp; But that is only true for the first two, for which examples are show=
n=2E&nbsp; Where are these segment types defined?&nbsp; The definition, and=
 not the examples, is the Major issue here=2E&nbsp; This document being the=
 main architecture document should include the complete description=2E&nbsp=
; BTW, the list is only about the &ldquo;MPLS instantiation&rdquo;, are the=
re similar types of segments for IP?</p><p></p><p class=3D"MsoNormal">&nbsp=
;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">=
M2=2E From Section 2=2E (Terminology): &ldquo;Using the same SRGB on all no=
des within the SR domain ease operations and troubleshooting and is expecte=
d to be a deployment guideline=2E&rdquo;&nbsp; It is &ldquo;expected to be =
a deployment guideline&rdquo; where/when??&nbsp; Given that this document i=
s the general architecture, I figured that maybe draft-ietf-spring-segment-=
routing-mpls contained that deployment recommendation, but all that documen=
t says is: &ldquo;As described in [I-D=2Eietf-spring-segment-routing], usin=
g the same SRGB on all nodes within the SR domain eases operations and trou=
bleshooting and is expected to be a deployment guideline=2E&rdquo;&nbsp; So=
&hellip;where are the Deployment/Operational considerations related to the =
SRGB?&nbsp; I note that neither document (draft-ietf-spring-segment-routing=
 or draft-ietf-spring-segment-routing-mpls) include them=2E &nbsp;I would e=
xpect some information to be in this (general) document and other more spec=
ific information (like the considerations about using the same SRGB) to be =
in the more specific document (draft-ietf-spring-segment-routing-mpls, in t=
his case)=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"=
MsoNormal">M2=2E1=2E&nbsp; The example illustrated in Figure 2 would be a g=
reat place to demonstrate the value of having the same SRGB=2E&nbsp; In fac=
t, the text now shows things not working and it even warns by saying that &=
ldquo;using anycast segment without configuring the same SRGB on nodes belo=
nging to the same device group may lead to misrouting&rdquo;, but no explan=
ation of how it should be done the right way=2E</p><p></p><p class=3D"MsoNo=
rmal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"=
MsoNormal">M3=2E From Section 2=2E (Terminology): &ldquo;&hellip;a global s=
egment is represented by a globally-unique index=2E&rdquo;&nbsp; </p><p></p=
><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M3=2E1=2E&n=
bsp; I couldn&rsquo;t find anywhere a discussion about the use of the index=
=2E&nbsp; When it is discussed in 3=2E1=2E2, it seems to be an understood c=
oncept: &ldquo;A Prefix-SID is allocated in the form of an index in the SRG=
B&hellip;&rdquo;&nbsp; Even if straightforward, I think the concept of the =
index should be explained (maybe with an example) and not assumed=2E&nbsp; =
I again went to look at draft-ietf-spring-segment-routing-mpls, but that do=
cument just points back to this one: &ldquo;The notion of indexed global se=
gment, defined in [I-D=2Eietf-spring-segment-routing]&hellip;&rdquo; </p><p=
></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M3=2E2=
=2E I assume that &ldquo;globally-unique index&rdquo; is really unique to t=
he SR Domain, right?&nbsp; I ask this question because &ldquo;globally-uniq=
ue IPv6 address&rdquo; has a different connotation (as in unique world-wide=
, not just inside a domain)=2E&nbsp; Please clarify=2E</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M3=2E3=2E&nbsp; Note=
 that the latest version (-10) of draft-ietf-spring-segment-routing-mpls in=
troduced the SR Local Block (SRLB) which is not defined in this document=2E=
&nbsp; I mention it here because it was introduced right after the pointer =
about the index&hellip;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><=
p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M4=2E Section=
 3=2E1=2E1=2E (Prefix-SID Algorithm)</p><p></p><p class=3D"MsoNormal">&nbsp=
;</p><p></p><p class=3D"MsoNormal">M4=2E1=2E This section starts by justify=
ing the use of an algorithm based on the IGP protocol extensions: the exten=
sions have an algorithm field, so we should use it=2E&nbsp; The justificati=
on should be the other way around: this document (the architecture) defines=
 the concept of an algorithm and the extensions implement it=2E&nbsp; Pleas=
e re-word the first 3 paragraphs &ndash; note that the instance/topology re=
ferences seem superfluous to me=2E</p><p></p><p class=3D"MsoNormal">&nbsp;<=
/p><p></p><p class=3D"MsoNormal">M4=2E2=2E The algorithms are not really de=
fined &ndash; there are mentions of a &ldquo;well known ECMP-aware SPF algo=
rithm&rdquo;, but no specific reference to what that is=2E&nbsp; The last s=
entence in the Section mentions that the &ldquo;details of the two defined =
algorithms are defined in&hellip;&rdquo; pointing to the extension drafts &=
ndash; but those drafts just offer an additional piece of information in (f=
rom the OSPF document): &ldquo;the standard shortest path algorithm as comp=
uted by the OSPF protocol&rdquo;=2E&nbsp; Ideally the algorithms would be d=
efined here (even if it is just to say: &ldquo;the standard algorithm used =
in the corresponding IGP&rdquo;), and the extensions would just reference i=
t=2E </p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorm=
al">M4=2E3=2E&nbsp; When should the packets be dropped??&nbsp; The followin=
g text points to at least 3 different places where it should be dropped, on=
e marked with a MUST=2E&nbsp; Please clarify=2E</p><p></p><p class=3D"MsoNo=
rmal">&nbsp;</p><p></p><p class=3D"MsoNormal">M4=2E3=2E1=2E &ldquo;A router=
 MUST drop any SR traffic associated with the SR algorithm to the adjacent =
router, if the adjacent router has not advertised support for such SR algor=
ithm=2E&rdquo;&nbsp; Ok, this sounds as if the traffic is dropped one hop b=
efore the router not supporting the algorithm &ndash; and it has a MUST in =
it=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorm=
al">M4=2E3=2E2=2E &ldquo;The ingress node of an SR domain validates that th=
e path to a prefix&hellip;includes nodes all supporting the advertised algo=
rithm=2E&nbsp; As a consequence, if a node on the path does not support alg=
orithm X, the IGP-Prefix segment will be interrupted and will drop packet o=
n that node=2E&rdquo;&nbsp; This sounds like the traffic would be dropped o=
n the node not supporting the algorithm=2E</p><p></p><p class=3D"MsoNormal"=
>&nbsp;</p><p></p><p class=3D"MsoNormal">M4=2E3=2E3=2E &ldquo;It's the resp=
onsibility of the ingress node using a segment to check that all downstream=
 nodes support the algorithm of the segment=2E&rdquo;&nbsp; This last sente=
nce hints at the fact that the ingress node should maybe even stop the traf=
fic there, or maybe not sending it unless all nodes in the path support the=
 same algorithm&hellip;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><=
p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M5=2E Section=
 3=2E1=2E2=2E (MPLS Dataplane)=2E&nbsp; </p><p></p><p class=3D"MsoNormal">&=
nbsp;</p><p></p><p class=3D"MsoNormal">M5=2E1=2E The first bullet (again!) =
explains the architecture in function of the extensions=2E&nbsp; The archit=
ecture should explain what needs to be done and the extensions would then d=
o it&hellip;&nbsp; Suggestion:</p><p></p><p class=3D"MsoNormal">&nbsp;</p><=
p></p><p class=3D"MsoNormal">NEW&gt;</p><p></p><p class=3D"MsoNormal">&nbsp=
;&nbsp; In order to achieve a behavior equivalent to Penultimate Hop Poppin=
g</p><p></p><p class=3D"MsoNormal">&nbsp;&nbsp; in MPLS [Reference], a Node=
 N advertising a Prefix-SID SID-R for its </p><p></p><p class=3D"MsoNormal"=
>&nbsp;&nbsp;&nbsp;attached prefix R MUST be able to instruct its connected=
 neighbors to </p><p></p><p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;perform t=
he NEXT operation while processing SID-R=2E&nbsp; Upon receiving </p><p></p=
><p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;this instruction from Node N, its=
 neighbors of N MUST perform the NEXT</p><p></p><p class=3D"MsoNormal">&nbs=
p;&nbsp; operation while processing SID-R=2E&nbsp; Alternatively, the neigh=
bors of N </p><p></p><p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;MUST perform =
the CONTINUE operation while processing SID-R=2E</p><p></p><p class=3D"MsoN=
ormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M5=2E1=2E1=2E The penultimat=
e bullet refers again to the extensions (but it only mentions the P-bit thi=
s time)=2E&nbsp; Please explain what the architecture intends to do, but no=
t from the point of view of the extensions=2E&nbsp; This and the last bulle=
t seem to be the result of the first one (above)=2E&nbsp; I think that the =
first bullet would have enough text for the FIB entries to be obvious, but =
if you want to include this corollary, please do it right after=2E</p><p></=
p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M5=2E2=2E =
&ldquo;A Prefix-SID is allocated in the form of an index in the SRGB (or as=
 a local MPLS label) according to a process similar to IP address allocatio=
n=2E&rdquo;&nbsp; The SRGB is defined (in the Terminology section) as &ldqu=
o;the set of local labels reserved for global segments&rdquo;, what is the =
difference between &ldquo;an index in the SRGB&rdquo; and &ldquo;a local MP=
LS label&rdquo;?&nbsp; I&rsquo;m hoping that the explanation of the concept=
 of index would clarify this=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p>=
<p></p><p class=3D"MsoNormal">M5=2E2=2E1=2E Three bullets down&hellip; &ldq=
uo;If a node learns a Prefix-SID having a value that falls outside the loca=
lly configured SRGB range, then the node MUST NOT use the Prefix-SID&hellip=
;&rdquo;&nbsp; Going back to my previous question: it looks like &ldquo;a l=
ocal MPLS label&rdquo; would have to be included in the SRGB &ndash; again,=
 clarifying upfront would help a lot=2E&nbsp; Note that this piece of text =
falls into the recommendation of having the same SRGB configured in all nod=
es=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorm=
al">M5=2E2=2E2=2E&nbsp; Related to the concept of index and its relationshi=
p to the SRGB&hellip;the next bullet says: &ldquo;&hellip;the segment is gl=
obal (the SID is allocated from the SRGB or as an index)&rdquo;=2E&nbsp; We=
 now have &ldquo;globally-unique index&rdquo;, &ldquo;an index in the SRGB&=
rdquo;, and &ldquo;the SRGB or as an index&rdquo; (separately)=2E</p><p></p=
><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><=
p></p><p class=3D"MsoNormal">M6=2E Section 3=2E3=2E (IGP-Anycast Segment, A=
nycast SID): &ldquo;&hellip;the value of the SID following the anycast SID =
MUST be understood by all nodes advertising the same anycast segment=2E&rdq=
uo;&nbsp; It seems to me that this is really a statement of fact: all nodes=
, not just ones advertising an anycast segment must understand what to do w=
ith the next SID&hellip;&nbsp; IOW, s/MUST/must&nbsp; I would even take thi=
s sentence out because it is redundant and obvious=2E</p><p></p><p class=3D=
"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p cla=
ss=3D"MsoNormal">M7=2E Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID) al=
so tries to explain functionality starting from the extensions=2E</p><p></p=
><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M7=2E1=2E &=
ldquo;The encodings of the Adj-SID include the a set of flags among which t=
here is the B-flag=2E&nbsp; When set, the Adj-SID refers to an adjacency th=
at is eligible for protection (e=2Eg=2E: using IPFRR or MPLS-FRR)=2E&rdquo;=
&nbsp; If the Adjacency Segment is one that is locally significant to the n=
ode advertising it, what is the purpose of signaling that it is eligible fo=
r protection?&nbsp; Wouldn&rsquo;t that be a local decision as well?&nbsp; =
Maybe an example of how the architecture is expected to work would help=2E<=
/p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M7=
=2E2=2E &ldquo;The encodings of the Adj-SID also include the L-flag=2E&nbsp=
; When set, the Adj-SID has local significance=2E&nbsp; By default, the L-f=
lag is set=2E&rdquo;&nbsp; The definition of IGP-Adjacency Segment already =
says that it is &ldquo;local (unless explicitly advertised otherwise)&rdquo=
;, which makes this statement unnecessary=2E&nbsp; If you want to keep it, =
please figure out a way that doesn&rsquo;t justify it based on a bit in the=
 extensions=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M8=2E Section 3=2E5=
=2E (Binding Segment)=2E&nbsp; A binding segment is not described anywhere =
in this document &ndash; please do so!&nbsp; Section 3=2E5=2E1=2E (Mapping =
Server) mentions a &ldquo;Remote-Binding SID S advertised by the mapping se=
rver&rdquo;, and says that more &ldquo;details are described in the SR/LDP =
interworking procedures ([I-D=2Eietf-spring-segment-routing-ldp-interop]&rd=
quo;, but that draft doesn&rsquo;t mention a Binding Segment=2E&nbsp; Secti=
on 5=2E (IGP Mirroring Context Segment) says that &ldquo;the binding segmen=
t [is] defined in SR IGP protocol extensions ( [I-D=2Eietf-isis-segment-rou=
ting-extensions], [I-D=2Eietf-ospf-segment-routing-extensions] and [I-D=2Ei=
etf-ospf-ospfv3-segment-routing-extensions])&rdquo;; however, those documen=
ts don&rsquo;t mention a Binding Segment, they just (except for the OSPFv2 =
draft) define TLVs=2E&nbsp; Note that I-D=2Eietf-ospf-segment-routing-exten=
sions points back to this document when referring to the definition of a Bi=
nding SID, completing a circular reference=2E</p><p></p><p class=3D"MsoNorm=
al">&nbsp;</p><p></p><p class=3D"MsoNormal">M8=2E1=2E BTW, Section 5=2E (IG=
P Mirroring Context Segment) says that the &ldquo;Mirror SID is advertised =
using the binding segment&rdquo;, which then looks like the Mirror Segment =
is an application of the Binding Segment (+ an explicit indication of it)=
=2E&nbsp; I think that Section 5 should then be moved to be a sub-section o=
f 3=2E5=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"Ms=
oNormal">M8=2E2=2E Part of the Security Considerations (in Section 8=2E1) a=
re related to the Binding SID, which is another reason for clearly explaini=
ng that part of the architecture here=2E</p><p></p><p class=3D"MsoNormal">&=
nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorm=
al">M9=2E Section 3=2E5=2E1=2E (Mapping Server) mentions a Mapping Server, =
but it punts to I-D=2Eietf-spring-segment-routing-ldp-interop for further d=
etails=2E&nbsp; While the SRMS can be used for interoperability cases, I th=
ink that it is an important part of the overall architecture and as such it=
 should be described and discussed in this document instead&hellip;includin=
g any Manageability Considerations (as mentioned in Section 9)=2E</p><p></p=
><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><=
p></p><p class=3D"MsoNormal">M10=2E Section 3=2E6=2E (Inter-Area Considerat=
ions) </p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNor=
mal">M10=2E1=2E This section shows an example of the behavior: maintain the=
 SID across area boundaries=2E&nbsp; But it doesn&rsquo;t actually say how =
the architecture is expected to work=2E&nbsp; IOW, in the example the SID i=
s maintained, but should that always happen (MUST, SHOULD)? Or is it just a=
n example (MAY)?</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=
=3D"MsoNormal">M10=2E2=2E Another case of explaining the architecture based=
 on the extension functionality: &ldquo;When an ABR propagates a prefix fro=
m one area to another it MUST set the R-Flag=2E&rdquo;&nbsp; Maybe try some=
thing like this instead: &ldquo;The re-advertisement of an SID that origina=
ted on a different IGP area MUST be indicated=2E&rdquo;</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M10=2E3=2E [minor] A=
s the advertisement moves to the left (from Area 2 to the Backbone&hellip;)=
, the ABRs change the Node-SID for a Prefix-SID, right?&nbsp; The descripti=
on in the last 3 paragraphs uses Node-SID: &ldquo;node S&hellip;pushes Node=
-SID(150)&rdquo;=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p cl=
ass=3D"MsoNormal">M10=2E4=2E [minor] Going back to global vs local signific=
ance, it would be nice to remind the readers at this point that the SR doma=
in is really the whole IGP network, and not just one flooding domain&hellip=
;which is why SID 150 can be used throughout=2E</p><p></p><p class=3D"MsoNo=
rmal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"=
MsoNormal">M11=2E Section 4=2E (BGP Peering Segments) is the only non-IGP f=
ocused section in this document=2E&nbsp; The architecture of the EPE soluti=
on (as described in draft-ietf-spring-segment-routing-central-epe) goes bey=
ond what has already been discussed here because it incorporates elements s=
uch as a mandatory centralized controller, which was optional before (a PCE=
 server is mentioned only casually in the Terminology section)=2E&nbsp; Thi=
s leaves us with an incomplete architecture for the BGP case=2E&nbsp; I wou=
ld prefer it if the whole architecture was defined in this single document =
(i=2Ee=2E expand this section by potentially moving parts from draft-ietf-s=
pring-segment-routing-central-epe &ndash; which might leave that document w=
ithout enough content to stand alone)=2E</p><p></p><p class=3D"MsoNormal">&=
nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNorm=
al">M12=2E Section 8=2E (Security Considerations)=2E&nbsp; The main part of=
 this section talks about the instructions on the packets &ndash; is adding=
 that meta-data a security concern?&nbsp; I think it could be because someo=
ne watching could tell which &ldquo;forwarding path elements (e=2Eg=2E: nod=
es, links, services, etc=2E)&rdquo; are used for specific flows, etc=2E&nbs=
p;&nbsp; But I also think that the risk is mitigated by the fact that the i=
nformation MUST NOT be exposed outside the SR domain=2E&nbsp; Mentioning th=
at, and the fact that the SR domain will usually be under a single administ=
ration would be a good thing=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p>=
<p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">M13=
=2E Section 9=2E (Manageability Considerations) says that &ldquo;an impleme=
ntation SHOULD protect the network in case of conflict detection by providi=
ng a deterministic resolution approach&hellip;addressed in [I-D=2Eietf-spri=
ng-conflict-resolution]=2E&rdquo;&nbsp; That &ldquo;SHOULD&rdquo; is in con=
flict with I-D=2Eietf-spring-conflict-resolution (in WGLC) where it says th=
at &ldquo;All protocols which support SR MUST adhere to the policies define=
d in this document=2E&rdquo;&nbsp; It seems like the easy way forward is to=
 s/SHOULD/MUST=2E&nbsp; In either case, I think that I-D=2Eietf-spring-conf=
lict-resolution should be a Normative reference=2E</p><p></p><p class=3D"Ms=
oNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">Minor:</p><p></p><p =
class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P1=2E Introduct=
ion</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal=
">P1=2E1=2E The term &ldquo;service chain&rdquo; is used in the Abstract an=
d in the Introduction=2E&nbsp; Given that the concept is not vital to the a=
rchitecture and that there might be unnecessary confusion with SFC, I would=
 suggest taking it out=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p=
><p class=3D"MsoNormal">P1=2E2=2E&nbsp; Related&hellip;&nbsp; Section 1=2E1=
 says that this document &ldquo;defines&hellip;the service segments&rdquo;,=
 but there&rsquo;s no specific mention of &ldquo;service segments&rdquo; an=
ywhere, except for a very quick mention in Section 5=2E (IGP Mirroring Cont=
ext Segment)=2E&nbsp; What am I missing?&nbsp; Consider taking &ldquo;servi=
ce segments&rdquo; off the list of things this document defines=2E</p><p></=
p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P1=2E3=2E =
The last paragraph says that &ldquo;This document defines a set of instruct=
ions (called segments) that are required to fulfill the described use-cases=
=2E&rdquo;&nbsp; The use cases are not mentioned until 1=2E1=2E&nbsp; Sugge=
stion: merge Section 1 and 1=2E1 to provide proper flow to the text=2E</p><=
p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P1=2E4=
=2E Speaking of use cases, I-D=2Eietf-spring-oam-usecase doesn&rsquo;t actu=
ally include use cases that will affect the architecture=2E&nbsp; It includ=
es use case of how to use monitoring system defined in it=2E&nbsp; Same com=
ment for the mention in Section 9=2E</p><p></p><p class=3D"MsoNormal">&nbsp=
;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">=
P2=2E From Section 2=2E (Terminology)</p><p></p><p class=3D"MsoNormal">&nbs=
p;</p><p></p><p class=3D"MsoNormal">P2=2E1=2E SID is not defined, just exte=
nded=2E&nbsp; Besides the examples, please provide an actual definition=2E<=
/p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P2=
=2E2=2E &ldquo;The CONTINUE instruction is implemented as the SWAP instruct=
ion in the MPLS dataplane=2E&rdquo;&nbsp; Please include a reference to whe=
re the &ldquo;SWAP instruction&rdquo; is defined=2E&nbsp; I assume you&rsqu=
o;re really referring to &ldquo;label swapping&rdquo; in rfc3031, are you?&=
nbsp; If so, please be consistent as &ldquo;MPLS dataplane&rdquo; and &ldqu=
o;MPLS architecture&rdquo; are used in different places=2E</p><p></p><p cla=
ss=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P2=2E3=2E The &ldq=
uo;Local Segment&rdquo; definition says that for IPv6 it &ldquo;is not adve=
rtised in any routing protocol&rdquo;=2E&nbsp; But for MPLS it is advertise=
d, right?&nbsp; Please clarify=2E&nbsp; I think that some of the vocabulary=
 is a little confusing, for example, the definition of IGP-Adjacency Segmen=
t says that it &ldquo;is local (unless explicitly advertised otherwise) to =
the node that advertises it&rdquo; &ndash; this means that for IPv6 this pi=
ece of the architecture wouldn&rsquo;t apply because a Local Segment is not=
 advertised=2E&nbsp; To add to the confusion, draft-filsfils-spring-srv6-ne=
twork-programming talks about local SIDs&hellip;&nbsp; IOW, in some places =
it sounds as if what should be the general architecture only really applies=
 to MPLS &ndash; or maybe we need a more explicit local qualifier=2E</p><p>=
</p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P2=2E4=
=2E &ldquo;The PCEP discovery capability is described in [I-D=2Eietf-pce-se=
gment-routing]=2E&rdquo;&nbsp; That document doesn&rsquo;t even mention the=
 word &ldquo;discovery&rdquo;=2E&nbsp; Please use the proper name for easie=
r cross-reference=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p c=
lass=3D"MsoNormal">P2=2E5=2E &ldquo;unless explicitly advertised otherwise&=
rdquo; is used to qualify the global/local nature of a segment=2E&nbsp; How=
 do the characteristics of the segment change if &ldquo;explicitly advertis=
ed otherwise&rdquo;?&nbsp; For example, if an IGP-Prefix Segment is adverti=
sed as local, how do its characteristics change, or do they?</p><p></p><p c=
lass=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P2=2E5=2E1=2E In=
 Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID), the use of an Adj-SID i=
s illustrated for both the local and global cases, but both explanations sa=
y the same thing: &ldquo;forwarded along the shortest-path to N and then be=
 switched by N, without any IP shortest-path consideration, towards link L&=
rdquo; &ndash; I don&rsquo;t see a difference in behavior between the local=
 and global nature of this SID=2E&nbsp; There is some additional text relat=
ed to global: &ldquo;The use of global Adj-SID allows to reduce the size of=
 the segment list when expressing a path at the cost of additional state (i=
=2Ee=2E: the global Adj-SID will be inserted by all routers within the area=
 in their forwarding table)=2E&rdquo;&nbsp; If node N is the one executing =
on the Adj-SID, how does including it in other FIBs help?</p><p></p><p clas=
s=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P2=2E6=2E None of t=
he segments after Section 3=2E4 (binding, BGP, mirroring) are defined in th=
e Terminology=2E&nbsp; Please do so for completeness=2E</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p =
class=3D"MsoNormal">P3=2E Referring to Figure 1: &ldquo;&hellip;each PE dev=
ice is connected to two routers in each of the groups A and B=2E&rdquo;&nbs=
p; The routers connected to the PEs (Rx) are not in either group=2E</p><p><=
/p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p=
><p></p><p class=3D"MsoNormal">P4=2E s/Obviously//&nbsp; </p><p></p><p clas=
s=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p=
 class=3D"MsoNormal">P5=2E Section 3=2E4=2E (IGP-Adjacency Segment, Adj-SID=
): &ldquo;The remote node MAY be an adjacent IGP neighbor or a non-adjacent=
 neighbor&hellip;&rdquo;&nbsp; The &ldquo;MAY&rdquo; is out of place as the=
re isn&rsquo;t another option, it is one or the other=2E&nbsp; s/MAY/may</p=
><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbs=
p;</p><p></p><p class=3D"MsoNormal">P6=2E Maybe it&rsquo;s because the rest=
 of 3=2E5 is incomplete, but Section 3=2E5=2E2=2E (Tunnel Head-end) has no =
context to speak of &ndash; without that, it feels like an orphan section=
=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal=
">&nbsp;</p><p></p><p class=3D"MsoNormal">P7=2E Section 8=2E1=2E (MPLS Data=
 Plane)</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNo=
rmal">P7=2E1=2E You included a couple of references at the end of this sect=
ion, which is good=2E&nbsp; I would however not explicitly mention specific=
 sections, as the whole RFCs (rfc4381 and rfc5920) are about MPLS-related s=
ecurity=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"Ms=
oNormal">P7=2E2=2E You compare the use of a single segment to RSVP-TE &ndas=
h; if the security characteristics are similar, please provide a reference=
=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal=
">&nbsp;</p><p></p><p class=3D"MsoNormal">P8=2E References</p><p></p><p cla=
ss=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P8=2E1=2E RFC2460 =
was obsoleted by RFC8200 / RFC6822 was obsoleted by RFC8202</p><p></p><p cl=
ass=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">P8=2E2=2E I think=
 that the reference to RFC4206 should be Informative=2E</p><p></p><p class=
=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p =
class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">Nits:</p><p></p=
><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N1=2E The A=
bstract is very long &ndash; I would even say too long=2E&nbsp; If it was u=
p to me, I would leave just the first paragraph=2E</p><p></p><p class=3D"Ms=
oNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N2=2E The second to last p=
aragraph in the Introduction (&ldquo;Numerous use-cases&hellip;&rdquo;) ref=
erences the &ldquo;marketing style&rdquo; content of I-D=2Eietf-spring-oam-=
usecase=2E&nbsp; I have asked the authors of that document to please focus =
their content=2E&nbsp; Please consider taking this paragraph out=2E</p><p><=
/p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N3=2E s/p=
articipating into the source based/participating in the source based</p><p>=
</p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N4=2E Re=
ferences=2E&nbsp; Please add Informative references to netconf (Section 2),=
 PCEP (2), FRR (3=2E1=2E1), &ldquo;parallel adjacency suppression&rdquo; (3=
=2E4)=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoN=
ormal">N5=2E Section 3: &ldquo;IGP segments require extensions in link-stat=
e IGP protocols=2E&nbsp; IGP extensions are required in order to advertise =
the IGP segments=2E&rdquo;&nbsp; These 2 sentences say the exact same thing=
=2E&nbsp; </p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"Ms=
oNormal">N6=2E Please avoid using &ldquo;we&rdquo; in the text &ndash; exce=
pt for the Acknowledgements=2E</p><p></p><p class=3D"MsoNormal">&nbsp;</p><=
p></p><p class=3D"MsoNormal">N7=2E s/Regardless Segment Routing/Independent=
 of Segment Routing</p><p></p><p class=3D"MsoNormal">&nbsp;</p><p></p><p cl=
ass=3D"MsoNormal">N8=2E s/and not to each other individual nodes in the LAN=
/and not to individual nodes in the LAN</p><p></p><p class=3D"MsoNormal">&n=
bsp;</p><p></p><p class=3D"MsoNormal">N9=2E s/([I-D=2Eietf-spring-segment-r=
outing-ldp-interop]/[I-D=2Eietf-spring-segment-routing-ldp-interop]</p><p><=
/p><p class=3D"MsoNormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N10=2E &l=
dquo;IGP deployed using areas&rdquo;&nbsp; An area is an OSPF-specific cons=
truct &ndash; flooding domain is more generic=2E</p><p></p><p class=3D"MsoN=
ormal">&nbsp;</p><p></p><p class=3D"MsoNormal">N11=2E It would be nice if t=
he examples used IPv6 instead of IPv4=2E</p><p></p></div></blockquote></div=
></body></html>
------ZRMCPJGKBPP6UFHUMB3T80YJ1NMTNX--


From nobody Thu Oct 12 10:41:27 2017
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From: "Gaurav Dawra (gdawra)" <gdawra@cisco.com>
To: "draft-ietf-spring-segment-routing-central-epe@Ietf.org" <draft-ietf-spring-segment-routing-central-epe@Ietf.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>
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Thread-Topic: [spring] AD Review of draft-ietf-spring-segment-routing-central-epe-06
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Date: Thu, 12 Oct 2017 17:41:19 +0000
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From: "Gaurav Dawra (gdawra)" <gdawra@cisco.com>
To: "draft-ietf-spring-segment-routing-central-epe@Ietf.org" <draft-ietf-spring-segment-routing-central-epe@Ietf.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>
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Thread-Topic: [spring] AD Review of draft-ietf-spring-segment-routing-central-epe-06
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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/spring/Pwl9hUmlayF-i4zEj5Wlnt1jkBE>
Subject: Re: [spring] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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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
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Date: Tue, 17 Oct 2017 01:15:25 +0000
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Subject: Re: [spring] 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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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/lxJ8RR-cY_OJl9TEfFOUOaXv558>
Subject: Re: [spring] 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/spring/fBiqxAED3bt1UsV-MO59HkUpp-c>
Subject: Re: [spring] draft-ietf-mpls-spring-lsp-ping: resolution of issues raised in my RTG-DIR review
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From nobody Wed Oct 18 11:04:47 2017
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From: James N Guichard <james.n.guichard@huawei.com>
To: "Francois Clad (fclad)" <fclad@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Francois,

Reading through the description for static proxy I am given to believe that=
 the cache is preconfigured with the appropriate SR stack to be applied to =
traffic coming back from the service; if this is correct presumably this me=
ans that you can only support a single service-chain so that the correct SR=
 stack can be pushed back on to the packet; is this correct? I note that yo=
u then describe a dynamic proxy that caches the received SR stack for a giv=
en flow so that it can be reapplied to the traffic coming back from the ser=
vice; again, if you want to share that service across multiple service chai=
ns, is the assumption that you will cache the received SR stack on a per-pa=
cket basis so that you reapply the correct outgoing SR stack?

Thanks,

Jim

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Francois Clad (f=
clad)
Sent: Wednesday, October 18, 2017 10:47 AM
To: spring@ietf.org
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt

Hello,

We have just submitted draft-clad-spring-segment-routing-service-chaining-0=
0.

Any feedback is welcome.

Regards,
Francois

On 06/10/2017, 21:32, "internet-drafts@ietf.org" <internet-drafts@ietf.org>=
 wrote:

   =20
    A new version of I-D, draft-clad-spring-segment-routing-service-chainin=
g-00.txt
    has been successfully submitted by Francois Clad and posted to the
    IETF repository.
   =20
    Name:		draft-clad-spring-segment-routing-service-chaining
    Revision:	00
    Title:		Segment Routing for Service Chaining
    Document date:	2017-10-06
    Group:		Individual Submission
    Pages:		24
    URL:            https://www.ietf.org/internet-drafts/draft-clad-spring-=
segment-routing-service-chaining-00.txt
    Status:         https://datatracker.ietf.org/doc/draft-clad-spring-segm=
ent-routing-service-chaining/
    Htmlized:       https://tools.ietf.org/html/draft-clad-spring-segment-r=
outing-service-chaining-00
    Htmlized:       https://datatracker.ietf.org/doc/html/draft-clad-spring=
-segment-routing-service-chaining-00
   =20
   =20
    Abstract:
       This document defines data plane functionality required to implement
       service segments and achieve service chaining with MPLS and IPv6, as
       described in the Segment Routing architecture.
   =20
                                                                           =
          =20
   =20
   =20
    Please note that it may take a couple of minutes from the time of submi=
ssion
    until the htmlized version and diff are available at tools.ietf.org.
   =20
    The IETF Secretariat
   =20
   =20

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Date: Wed, 18 Oct 2017 13:34:58 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Francois Clad (fclad)" <fclad@cisco.com>, "spring@ietf.org" <spring@ietf.org>
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Hi Francois,

The draft has been published as the Standards Track document.
What is it you have been trying to standardize?

Thanks! 

Cheers,
Jeff

-----Original Message-----
From: spring <spring-bounces@ietf.org> on behalf of "Francois Clad (fclad)" <fclad@cisco.com>
Date: Wednesday, October 18, 2017 at 07:46
To: "spring@ietf.org" <spring@ietf.org>
Subject: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt

    Hello,
    
    We have just submitted draft-clad-spring-segment-routing-service-chaining-00.
    
    Any feedback is welcome.
    
    Regards,
    Francois
    
    On 06/10/2017, 21:32, "internet-drafts@ietf.org" <internet-drafts@ietf.org> wrote:
    
        
        A new version of I-D, draft-clad-spring-segment-routing-service-chaining-00.txt
        has been successfully submitted by Francois Clad and posted to the
        IETF repository.
        
        Name:		draft-clad-spring-segment-routing-service-chaining
        Revision:	00
        Title:		Segment Routing for Service Chaining
        Document date:	2017-10-06
        Group:		Individual Submission
        Pages:		24
        URL:            https://www.ietf.org/internet-drafts/draft-clad-spring-segment-routing-service-chaining-00.txt
        Status:         https://datatracker.ietf.org/doc/draft-clad-spring-segment-routing-service-chaining/
        Htmlized:       https://tools.ietf.org/html/draft-clad-spring-segment-routing-service-chaining-00
        Htmlized:       https://datatracker.ietf.org/doc/html/draft-clad-spring-segment-routing-service-chaining-00
        
        
        Abstract:
           This document defines data plane functionality required to implement
           service segments and achieve service chaining with MPLS and IPv6, as
           described in the Segment Routing architecture.
        
                                                                                          
        
        
        Please note that it may take a couple of minutes from the time of submission
        until the htmlized version and diff are available at tools.ietf.org.
        
        The IETF Secretariat
        
        
    
    _______________________________________________
    spring mailing list
    spring@ietf.org
    https://www.ietf.org/mailman/listinfo/spring
    



From nobody Thu Oct 19 07:30:15 2017
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/ndcWaXlsq06vpRyZcMUf-zVSbuI>
Subject: [spring] Slots requests for SPRING WG session - IETF 100 - Singapore
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All,

it is time we start building the SPRING WG agenda for Singapore.
The IETF agenda (still preliminary) is available at:
https://datatracker.ietf.org/meeting/100/agenda.html

The SPRING WG session (1h30) is scheduled on
Wednesday, November 15th, 2017 / Afternoon session II / 15:20-16:50 
(local time)

Please send us your request for a presentation slot, indicating
draft name, speaker, and desired duration (covering presentation and
discussion).

Please send the requests no later than the 30th of October.
Thank you

M&B


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From: "Francois Clad (fclad)" <fclad@cisco.com>
To: James N Guichard <james.n.guichard@huawei.com>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
Thread-Index: AQHTPtnf903/NeEVaUmHZgWtdD4Sw6LqFe+A///hMqCAAdHEAA==
Date: Thu, 19 Oct 2017 16:43:29 +0000
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Subject: Re: [spring] New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Jim,

Well read. This static proxy is the base mechanism that matches current sta=
te of the art. It has the same scaling limitations as NSH (state in the fab=
ric), but does not require separate encapsulations for traffic engineering =
and service chaining. With this integrated solution, the same encapsulation=
 can combine TE and service segments.

The static and dynamic proxies can support multiple service chains by using=
 different SID values and interfaces to differentiate the chains. The dynam=
ic proxy thus caches the received SRH on a per chain basis. (see sections 5=
.1 and 5.2)

Furthermore, the other proxy mechanisms described in this draft aim at addr=
essing the scaling issues by removing state from the proxy. We also expect =
that services will be eventually updated with native SR support. The propos=
ed model enables these SR-native services to be transparently combined with=
 proxied ones or segments of any other type in the same encapsulation.

I hope that answers your questions.

Thanks,
Francois

On 18 Oct 2017, at 20:04, James N Guichard <james.n.guichard@huawei.com<mai=
lto:james.n.guichard@huawei.com>> wrote:

Hi Francois,

Reading through the description for static proxy I am given to believe that=
 the cache is preconfigured with the appropriate SR stack to be applied to =
traffic coming back from the service; if this is correct presumably this me=
ans that you can only support a single service-chain so that the correct SR=
 stack can be pushed back on to the packet; is this correct? I note that yo=
u then describe a dynamic proxy that caches the received SR stack for a giv=
en flow so that it can be reapplied to the traffic coming back from the ser=
vice; again, if you want to share that service across multiple service chai=
ns, is the assumption that you will cache the received SR stack on a per-pa=
cket basis so that you reapply the correct outgoing SR stack?

Thanks,

Jim

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Francois Clad (f=
clad)
Sent: Wednesday, October 18, 2017 10:47 AM
To: spring@ietf.org<mailto:spring@ietf.org>
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt

Hello,

We have just submitted draft-clad-spring-segment-routing-service-chaining-0=
0.

Any feedback is welcome.

Regards,
Francois

On 06/10/2017, 21:32, "internet-drafts@ietf.org<mailto:internet-drafts@ietf=
.org>" <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>> wrote:


   A new version of I-D, draft-clad-spring-segment-routing-service-chaining=
-00.txt
   has been successfully submitted by Francois Clad and posted to the
   IETF repository.

   Name: draft-clad-spring-segment-routing-service-chaining
   Revision: 00
   Title: Segment Routing for Service Chaining
   Document date: 2017-10-06
   Group: Individual Submission
   Pages: 24
   URL:            https://www.ietf.org/internet-drafts/draft-clad-spring-s=
egment-routing-service-chaining-00.txt
   Status:         https://datatracker.ietf.org/doc/draft-clad-spring-segme=
nt-routing-service-chaining/
   Htmlized:       https://tools.ietf.org/html/draft-clad-spring-segment-ro=
uting-service-chaining-00
   Htmlized:       https://datatracker.ietf.org/doc/html/draft-clad-spring-=
segment-routing-service-chaining-00


   Abstract:
      This document defines data plane functionality required to implement
      service segments and achieve service chaining with MPLS and IPv6, as
      described in the Segment Routing architecture.




   Please note that it may take a couple of minutes from the time of submis=
sion
   until the htmlized version and diff are available at tools.ietf.org<http=
://tools.ietf.org>.

   The IETF Secretariat



_______________________________________________
spring mailing list
spring@ietf.org<mailto:spring@ietf.org>
https://www.ietf.org/mailman/listinfo/spring


--_000_167F251681C54BA3B41BB40DFCB0ECBBciscocom_
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Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break:=
 after-white-space;" class=3D"">
Hi Jim,<br class=3D"">
<br class=3D"">
Well read. This static proxy is the base mechanism that matches current sta=
te of the art. It has the same scaling limitations as NSH (state in the fab=
ric), but does not require&nbsp;separate encapsulations for traffic enginee=
ring and service chaining. With this
 integrated solution, the same encapsulation can combine TE and service seg=
ments.<br class=3D"">
<br class=3D"">
The static and dynamic proxies can support multiple service chains by using=
 different SID values and interfaces to differentiate the chains. The dynam=
ic proxy thus caches the&nbsp;received SRH on a per chain basis. (see secti=
ons 5.1 and 5.2)<br class=3D"">
<br class=3D"">
Furthermore, the other proxy mechanisms described in this draft aim at addr=
essing the scaling issues by removing state from the proxy. We also expect =
that services will&nbsp;be eventually updated with native SR support. The p=
roposed model enables these SR-native
 services to be transparently combined with proxied ones or segments of any=
 other type in the same encapsulation.<br class=3D"">
<br class=3D"">
I hope that answers your questions.<br class=3D"">
<br class=3D"">
Thanks,<br class=3D"">
Francois<br class=3D"">
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On 18 Oct 2017, at 20:04, James N Guichard &lt;<a href=3D"m=
ailto:james.n.guichard@huawei.com" class=3D"">james.n.guichard@huawei.com</=
a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"">Hi Francois,<br class=3D"">
<br class=3D"">
Reading through the description for static proxy I am given to believe that=
 the cache is preconfigured with the appropriate SR stack to be applied to =
traffic coming back from the service; if this is correct presumably this me=
ans that you can only support a
 single service-chain so that the correct SR stack can be pushed back on to=
 the packet; is this correct? I note that you then describe a dynamic proxy=
 that caches the received SR stack for a given flow so that it can be reapp=
lied to the traffic coming back
 from the service; again, if you want to share that service across multiple=
 service chains, is the assumption that you will cache the received SR stac=
k on a per-packet basis so that you reapply the correct outgoing SR stack?<=
br class=3D"">
<br class=3D"">
Thanks,<br class=3D"">
<br class=3D"">
Jim<br class=3D"">
<br class=3D"">
-----Original Message-----<br class=3D"">
From: spring [<a href=3D"mailto:spring-bounces@ietf.org" class=3D"">mailto:=
spring-bounces@ietf.org</a>] On Behalf Of Francois Clad (fclad)<br class=3D=
"">
Sent: Wednesday, October 18, 2017 10:47 AM<br class=3D"">
To: <a href=3D"mailto:spring@ietf.org" class=3D"">spring@ietf.org</a><br cl=
ass=3D"">
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt<br class=3D"">
<br class=3D"">
Hello,<br class=3D"">
<br class=3D"">
We have just submitted draft-clad-spring-segment-routing-service-chaining-0=
0.<br class=3D"">
<br class=3D"">
Any feedback is welcome.<br class=3D"">
<br class=3D"">
Regards,<br class=3D"">
Francois<br class=3D"">
<br class=3D"">
On 06/10/2017, 21:32, &quot;<a href=3D"mailto:internet-drafts@ietf.org" cla=
ss=3D"">internet-drafts@ietf.org</a>&quot; &lt;<a href=3D"mailto:internet-d=
rafts@ietf.org" class=3D"">internet-drafts@ietf.org</a>&gt; wrote:<br class=
=3D"">
<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;&nbsp;A new version of I-D, draft-clad-spring-segment-routing-s=
ervice-chaining-00.txt<br class=3D"">
&nbsp;&nbsp;&nbsp;has been successfully submitted by Francois Clad and post=
ed to the<br class=3D"">
&nbsp;&nbsp;&nbsp;IETF repository.<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;&nbsp;Name:<span class=3D"Apple-tab-span" style=3D"white-space:=
pre"> </span><span class=3D"Apple-tab-span" style=3D"white-space:pre"></spa=
n>draft-clad-spring-segment-routing-service-chaining<br class=3D"">
&nbsp;&nbsp;&nbsp;Revision:<span class=3D"Apple-tab-span" style=3D"white-sp=
ace:pre"> </span>00<br class=3D"">
&nbsp;&nbsp;&nbsp;Title:<span class=3D"Apple-tab-span" style=3D"white-space=
:pre"> </span><span class=3D"Apple-tab-span" style=3D"white-space:pre"></sp=
an>Segment Routing for Service Chaining<br class=3D"">
&nbsp;&nbsp;&nbsp;Document date:<span class=3D"Apple-tab-span" style=3D"whi=
te-space:pre"> </span>2017-10-06<br class=3D"">
&nbsp;&nbsp;&nbsp;Group:<span class=3D"Apple-tab-span" style=3D"white-space=
:pre"> </span><span class=3D"Apple-tab-span" style=3D"white-space:pre"></sp=
an>Individual Submission<br class=3D"">
&nbsp;&nbsp;&nbsp;Pages:<span class=3D"Apple-tab-span" style=3D"white-space=
:pre"> </span><span class=3D"Apple-tab-span" style=3D"white-space:pre"></sp=
an>24<br class=3D"">
&nbsp;&nbsp;&nbsp;URL: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;<a href=3D"https://www.ietf.org/internet-drafts/draft-clad-sp=
ring-segment-routing-service-chaining-00.txt" class=3D"">https://www.ietf.o=
rg/internet-drafts/draft-clad-spring-segment-routing-service-chaining-00.tx=
t</a><br class=3D"">
&nbsp;&nbsp;&nbsp;Status: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<=
a href=3D"https://datatracker.ietf.org/doc/draft-clad-spring-segment-routin=
g-service-chaining/" class=3D"">https://datatracker.ietf.org/doc/draft-clad=
-spring-segment-routing-service-chaining/</a><br class=3D"">
&nbsp;&nbsp;&nbsp;Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"=
https://tools.ietf.org/html/draft-clad-spring-segment-routing-service-chain=
ing-00" class=3D"">https://tools.ietf.org/html/draft-clad-spring-segment-ro=
uting-service-chaining-00</a><br class=3D"">
&nbsp;&nbsp;&nbsp;Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"=
https://datatracker.ietf.org/doc/html/draft-clad-spring-segment-routing-ser=
vice-chaining-00" class=3D"">https://datatracker.ietf.org/doc/html/draft-cl=
ad-spring-segment-routing-service-chaining-00</a><br class=3D"">
<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;&nbsp;Abstract:<br class=3D"">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This document defines data plane functi=
onality required to implement<br class=3D"">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;service segments and achieve service ch=
aining with MPLS and IPv6, as<br class=3D"">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;described in the Segment Routing archit=
ecture.<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;&nbsp;Please note that it may take a couple of minutes from the=
 time of submission<br class=3D"">
&nbsp;&nbsp;&nbsp;until the htmlized version and diff are available at <a h=
ref=3D"http://tools.ietf.org" class=3D"">
tools.ietf.org</a>.<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;&nbsp;The IETF Secretariat<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
_______________________________________________<br class=3D"">
spring mailing list<br class=3D"">
<a href=3D"mailto:spring@ietf.org" class=3D"">spring@ietf.org</a><br class=
=3D"">
https://www.ietf.org/mailman/listinfo/spring<br class=3D"">
</div>
</div>
</blockquote>
</div>
<br class=3D"">
</body>
</html>

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From: James N Guichard <james.n.guichard@huawei.com>
To: "Francois Clad (fclad)" <fclad@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Francois,

Thank you for these clarifications; couple of comments inline..

From: Francois Clad (fclad) [mailto:fclad@cisco.com]
Sent: Thursday, October 19, 2017 12:43 PM
To: James N Guichard <james.n.guichard@huawei.com>
Cc: spring@ietf.org
Subject: Re: New Version Notification for draft-clad-spring-segment-routing=
-service-chaining-00.txt

Hi Jim,

Well read. This static proxy is the base mechanism that matches current sta=
te of the art. It has the same scaling limitations as NSH (state in the fab=
ric), but does not require separate encapsulations for traffic engineering =
and service chaining. With this integrated solution, the same encapsulation=
 can combine TE and service segments

Jim> I did not mention NSH as I was not interested in a comparison but seei=
ng as you bring it up :) ... NSH theoretically can be used for both traffic=
 engineering and service chaining; the former just requires a path that con=
sists of SFFs so the implication that NSH forces a different encapsulation =
to satisfy the traffic engineering use case is simply not true.


The static and dynamic proxies can support multiple service chains by using=
 different SID values and interfaces to differentiate the chains. The dynam=
ic proxy thus caches the received SRH on a per chain basis. (see sections 5=
.1 and 5.2)

Jim> okay, thank you for the clarification

Jim


Furthermore, the other proxy mechanisms described in this draft aim at addr=
essing the scaling issues by removing state from the proxy. We also expect =
that services will be eventually updated with native SR support. The propos=
ed model enables these SR-native services to be transparently combined with=
 proxied ones or segments of any other type in the same encapsulation.

I hope that answers your questions.

Thanks,
Francois


On 18 Oct 2017, at 20:04, James N Guichard <james.n.guichard@huawei.com<mai=
lto:james.n.guichard@huawei.com>> wrote:

Hi Francois,

Reading through the description for static proxy I am given to believe that=
 the cache is preconfigured with the appropriate SR stack to be applied to =
traffic coming back from the service; if this is correct presumably this me=
ans that you can only support a single service-chain so that the correct SR=
 stack can be pushed back on to the packet; is this correct? I note that yo=
u then describe a dynamic proxy that caches the received SR stack for a giv=
en flow so that it can be reapplied to the traffic coming back from the ser=
vice; again, if you want to share that service across multiple service chai=
ns, is the assumption that you will cache the received SR stack on a per-pa=
cket basis so that you reapply the correct outgoing SR stack?

Thanks,

Jim

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Francois Clad (f=
clad)
Sent: Wednesday, October 18, 2017 10:47 AM
To: spring@ietf.org<mailto:spring@ietf.org>
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt

Hello,

We have just submitted draft-clad-spring-segment-routing-service-chaining-0=
0.

Any feedback is welcome.

Regards,
Francois

On 06/10/2017, 21:32, "internet-drafts@ietf.org<mailto:internet-drafts@ietf=
.org>" <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>> wrote:


   A new version of I-D, draft-clad-spring-segment-routing-service-chaining=
-00.txt
   has been successfully submitted by Francois Clad and posted to the
   IETF repository.

   Name: draft-clad-spring-segment-routing-service-chaining
   Revision: 00
   Title: Segment Routing for Service Chaining
   Document date: 2017-10-06
   Group: Individual Submission
   Pages: 24
   URL:            https://www.ietf.org/internet-drafts/draft-clad-spring-s=
egment-routing-service-chaining-00.txt
   Status:         https://datatracker.ietf.org/doc/draft-clad-spring-segme=
nt-routing-service-chaining/
   Htmlized:       https://tools.ietf.org/html/draft-clad-spring-segment-ro=
uting-service-chaining-00
   Htmlized:       https://datatracker.ietf.org/doc/html/draft-clad-spring-=
segment-routing-service-chaining-00


   Abstract:
      This document defines data plane functionality required to implement
      service segments and achieve service chaining with MPLS and IPv6, as
      described in the Segment Routing architecture.




   Please note that it may take a couple of minutes from the time of submis=
sion
   until the htmlized version and diff are available at tools.ietf.org<http=
://tools.ietf.org>.

   The IETF Secretariat



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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Hi Francois,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Thank you for these clarifications; c=
ouple of comments inline..<o:p></o:p></span></p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbs=
p;</o:p></span></a></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Francois Clad (fclad) [mailto:=
fclad@cisco.com]
<br>
<b>Sent:</b> Thursday, October 19, 2017 12:43 PM<br>
<b>To:</b> James N Guichard &lt;james.n.guichard@huawei.com&gt;<br>
<b>Cc:</b> spring@ietf.org<br>
<b>Subject:</b> Re: New Version Notification for draft-clad-spring-segment-=
routing-service-chaining-00.txt<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Jim,<br>
<br>
Well read. This static proxy is the base mechanism that matches current sta=
te of the art. It has the same scaling limitations as NSH (state in the fab=
ric), but does not require&nbsp;separate encapsulations for traffic enginee=
ring and service chaining. With this
 integrated solution, the same encapsulation can combine TE and service seg=
ment<span style=3D"color:#1F497D">s<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Jim&gt; I did not mention NSH as I wa=
s not interested in a comparison but seeing as you bring it up
</span><span style=3D"font-size:11.0pt;font-family:Wingdings;color:#1F497D"=
>J</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sa=
ns-serif;color:#1F497D"> &#8230; NSH theoretically can be used for both tra=
ffic engineering and service chaining; the former just
 requires a path that consists of SFFs so the implication that NSH forces a=
 different encapsulation to satisfy the traffic engineering use case is sim=
ply not true.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><br>
<br>
The static and dynamic proxies can support multiple service chains by using=
 different SID values and interfaces to differentiate the chains. The dynam=
ic proxy thus caches the&nbsp;received SRH on a per chain basis. (see secti=
ons 5.1 and 5.2)<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Jim&gt; okay, thank you for the clari=
fication<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Jim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><br>
<br>
Furthermore, the other proxy mechanisms described in this draft aim at addr=
essing the scaling issues by removing state from the proxy. We also expect =
that services will&nbsp;be eventually updated with native SR support. The p=
roposed model enables these SR-native
 services to be transparently combined with proxied ones or segments of any=
 other type in the same encapsulation.<br>
<br>
I hope that answers your questions.<br>
<br>
Thanks,<br>
Francois<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On 18 Oct 2017, at 20:04, James N Guichard &lt;<a hr=
ef=3D"mailto:james.n.guichard@huawei.com">james.n.guichard@huawei.com</a>&g=
t; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Francois,<br>
<br>
Reading through the description for static proxy I am given to believe that=
 the cache is preconfigured with the appropriate SR stack to be applied to =
traffic coming back from the service; if this is correct presumably this me=
ans that you can only support a
 single service-chain so that the correct SR stack can be pushed back on to=
 the packet; is this correct? I note that you then describe a dynamic proxy=
 that caches the received SR stack for a given flow so that it can be reapp=
lied to the traffic coming back
 from the service; again, if you want to share that service across multiple=
 service chains, is the assumption that you will cache the received SR stac=
k on a per-packet basis so that you reapply the correct outgoing SR stack?<=
br>
<br>
Thanks,<br>
<br>
Jim<br>
<br>
-----Original Message-----<br>
From: spring [<a href=3D"mailto:spring-bounces@ietf.org">mailto:spring-boun=
ces@ietf.org</a>] On Behalf Of Francois Clad (fclad)<br>
Sent: Wednesday, October 18, 2017 10:47 AM<br>
To: <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt<br>
<br>
Hello,<br>
<br>
We have just submitted draft-clad-spring-segment-routing-service-chaining-0=
0.<br>
<br>
Any feedback is welcome.<br>
<br>
Regards,<br>
Francois<br>
<br>
On 06/10/2017, 21:32, &quot;<a href=3D"mailto:internet-drafts@ietf.org">int=
ernet-drafts@ietf.org</a>&quot; &lt;<a href=3D"mailto:internet-drafts@ietf.=
org">internet-drafts@ietf.org</a>&gt; wrote:<br>
<br>
<br>
&nbsp;&nbsp;&nbsp;A new version of I-D, draft-clad-spring-segment-routing-s=
ervice-chaining-00.txt<br>
&nbsp;&nbsp;&nbsp;has been successfully submitted by Francois Clad and post=
ed to the<br>
&nbsp;&nbsp;&nbsp;IETF repository.<br>
<br>
&nbsp;&nbsp;&nbsp;Name:<span class=3D"apple-tab-span"> </span>draft-clad-sp=
ring-segment-routing-service-chaining<br>
&nbsp;&nbsp;&nbsp;Revision:<span class=3D"apple-tab-span"> </span>00<br>
&nbsp;&nbsp;&nbsp;Title:<span class=3D"apple-tab-span"> </span>Segment Rout=
ing for Service Chaining<br>
&nbsp;&nbsp;&nbsp;Document date:<span class=3D"apple-tab-span"> </span>2017=
-10-06<br>
&nbsp;&nbsp;&nbsp;Group:<span class=3D"apple-tab-span"> </span>Individual S=
ubmission<br>
&nbsp;&nbsp;&nbsp;Pages:<span class=3D"apple-tab-span"> </span>24<br>
&nbsp;&nbsp;&nbsp;URL: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;<a href=3D"https://www.ietf.org/internet-drafts/draft-clad-sp=
ring-segment-routing-service-chaining-00.txt">https://www.ietf.org/internet=
-drafts/draft-clad-spring-segment-routing-service-chaining-00.txt</a><br>
&nbsp;&nbsp;&nbsp;Status: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<=
a href=3D"https://datatracker.ietf.org/doc/draft-clad-spring-segment-routin=
g-service-chaining/">https://datatracker.ietf.org/doc/draft-clad-spring-seg=
ment-routing-service-chaining/</a><br>
&nbsp;&nbsp;&nbsp;Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"=
https://tools.ietf.org/html/draft-clad-spring-segment-routing-service-chain=
ing-00">https://tools.ietf.org/html/draft-clad-spring-segment-routing-servi=
ce-chaining-00</a><br>
&nbsp;&nbsp;&nbsp;Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"=
https://datatracker.ietf.org/doc/html/draft-clad-spring-segment-routing-ser=
vice-chaining-00">https://datatracker.ietf.org/doc/html/draft-clad-spring-s=
egment-routing-service-chaining-00</a><br>
<br>
<br>
&nbsp;&nbsp;&nbsp;Abstract:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This document defines data plane functi=
onality required to implement<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;service segments and achieve service ch=
aining with MPLS and IPv6, as<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;described in the Segment Routing archit=
ecture.<br>
<br>
<br>
<br>
<br>
&nbsp;&nbsp;&nbsp;Please note that it may take a couple of minutes from the=
 time of submission<br>
&nbsp;&nbsp;&nbsp;until the htmlized version and diff are available at <a h=
ref=3D"http://tools.ietf.org">
tools.ietf.org</a>.<br>
<br>
&nbsp;&nbsp;&nbsp;The IETF Secretariat<br>
<br>
<br>
<br>
_______________________________________________<br>
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rg/mailman/listinfo/spring</a><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From nobody Fri Oct 20 17:30:49 2017
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Dear Martin Vigoureux,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 

spring Session 1 (1:30:00)
    Wednesday, Afternoon Session II 1520-1650
    Room Name: Olivia size: 150
    ---------------------------------------------
    


Request Information:


---------------------------------------------------------
Working Group Name: Source Packet Routing in Networking
Area Name: Routing Area
Session Requester: Martin Vigoureux

Number of Sessions: 1
Length of Session(s):  1.5 Hours
Number of Attendees: 80
Conflicts to Avoid: 
 First Priority: mpls isis ospf
 Second Priority: bess sfc rtgwg



People who must be present:
  Bruno Decraene
  Martin Vigoureux
  Alvaro Retana

Resources Requested:

Special Requests:
  
---------------------------------------------------------


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From: Greg Mirsky <gregimirsky@gmail.com>
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Subject: [spring] Fwd: New Version Notification for draft-mirsky-bfd-mpls-demand-02.txt
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Dear All,
new version of the draft includes more detailed specification of why the
ingress LSR is to send BFD control packet to acknowledge failure
notification from the egress over IP network and more detailed description
of encapsulation of the BFD control packet in this case.

Your comments, questions always welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, Oct 23, 2017 at 6:25 PM
Subject: New Version Notification for draft-mirsky-bfd-mpls-demand-02.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-bfd-mpls-demand-02.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:           draft-mirsky-bfd-mpls-demand
Revision:       02
Title:          BFD in Demand Mode over Point-to-Point MPLS LSP
Document date:  2017-10-23
Group:          Individual Submission
Pages:          5
URL:            https://www.ietf.org/internet-drafts/draft-mirsky-bfd-mpls-
demand-02.txt
Status:         https://datatracker.ietf.org/doc/draft-mirsky-bfd-mpls-
demand/
Htmlized:       https://tools.ietf.org/html/draft-mirsky-bfd-mpls-demand-02
Htmlized:       https://datatracker.ietf.org/doc/html/draft-mirsky-bfd-
mpls-demand-02
Diff:           https://www.ietf.org/rfcdiff?url2=draft-mirsky-bfd-mpls-
demand-02

Abstract:
   This document describes procedures for using Bidirectional Forwarding
   Detection (BFD) in Demand mode to detect data plane failures in
   Multiprotocol Label Switching (MPLS) point-to-point Label Switched
   Paths.




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

The IETF Secretariat

--94eb2c1cd2f2646f08055c4a21f2
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear All,<div>new version of the draft includes more detai=
led specification of why the ingress LSR is to send BFD control packet to a=
cknowledge failure notification from the egress over IP network and more de=
tailed description of encapsulation of the BFD control packet in this case.=
</div><div><br></div><div>Your comments, questions always welcome and great=
ly appreciated.</div><div><br></div><div>Regards,</div><div>Greg<br><div><b=
r><div class=3D"gmail_quote">---------- Forwarded message ----------<br>Fro=
m: <b class=3D"gmail_sendername"></b> <span dir=3D"ltr">&lt;<a href=3D"mail=
to:internet-drafts@ietf.org">internet-drafts@ietf.org</a>&gt;</span><br>Dat=
e: Mon, Oct 23, 2017 at 6:25 PM<br>Subject: New Version Notification for dr=
aft-mirsky-bfd-mpls-demand-02.txt<br>To: Gregory Mirsky &lt;<a href=3D"mail=
to:gregimirsky@gmail.com">gregimirsky@gmail.com</a>&gt;<br><br><br><br>
A new version of I-D, draft-mirsky-bfd-mpls-demand-<wbr>02.txt<br>
has been successfully submitted by Greg Mirsky and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-bfd-mpls-demand<=
br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 BFD in Demand Mode over Point-to-P=
oint MPLS LSP<br>
Document date:=C2=A0 2017-10-23<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 5<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-mirsky-bfd-mpls-demand-02.txt" rel=3D"noreferrer" =
target=3D"_blank">https://www.ietf.org/internet-<wbr>drafts/draft-mirsky-bf=
d-mpls-<wbr>demand-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-mirsky-bfd-mpls-demand/" rel=3D"noreferrer" target=3D"_blan=
k">https://datatracker.ietf.org/<wbr>doc/draft-mirsky-bfd-mpls-<wbr>demand/=
</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-mirsky-bfd-mpls-demand-02" rel=3D"noreferrer" target=3D"_blank">https=
://tools.ietf.org/html/<wbr>draft-mirsky-bfd-mpls-demand-<wbr>02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-mirsky-bfd-mpls-demand-02" rel=3D"noreferrer" target=3D"_bl=
ank">https://datatracker.ietf.org/<wbr>doc/html/draft-mirsky-bfd-<wbr>mpls-=
demand-02</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-mirsky-bfd-mpls-demand-02" rel=3D"noreferrer" targe=
t=3D"_blank">https://www.ietf.org/rfcdiff?<wbr>url2=3Ddraft-mirsky-bfd-mpls=
-<wbr>demand-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document describes procedures for using Bidirectional For=
warding<br>
=C2=A0 =C2=A0Detection (BFD) in Demand mode to detect data plane failures i=
n<br>
=C2=A0 =C2=A0Multiprotocol Label Switching (MPLS) point-to-point Label Swit=
ched<br>
=C2=A0 =C2=A0Paths.<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
<br>
</div><br></div></div></div>

--94eb2c1cd2f2646f08055c4a21f2--


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From: "Bernier, Daniel" <daniel.bernier@bell.ca>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Francois Clad (fclad)" <fclad@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Jeff, =0A=
=0A=
Do you mind if I take the microphone on this one?=0A=
=0A=
The expired draft-homma (ref: https://tools.ietf.org/html/draft-homma-sfc-f=
orwarding-methods-analysis-05#page-23 ) on SFC forwarding methods detailed =
pretty well the various options for forwarding in the context of service ch=
aining and in particular the value for SPs into the use of stacked headers =
but also potential caveats or required enhancements at the time of writing.=
  =0A=
=0A=
Following on that thought, I think it becomes essential that SPRING address=
es these caveats/enhancements. =0A=
=0A=
And contrary to Alvaro=92s comment in his review of draft-ietf-spring-segme=
nt-routing-mpls (ref: https://mailarchive.ietf.org/arch/msg/spring/97KtDeby=
roHfuNvllpNVb0s66H8/?qid=3D75cfe3b3b0f6d44817785cc576610ac3 ). I believe it=
 also becomes apparent that answering SFC is =93vital=94. As it was part of=
 the SR architecture drafts from the beginning (ref:  https://tools.ietf.or=
g/html/draft-filsfils-rtgwg-segment-routing-00#page-23 ). Even more reason =
to address this in SPRING.=0A=
=0A=
So, going back to your question, for us operators, I think it is essential =
that required forwarding behaviors, such as proxy mechanisms leveraging SR,=
 get standardized so we can get interoperability and predictability between=
 implementations. Be it in software or hardware. =0A=
=0A=
For an SP, the notion of =93service-chains=94 is currently pretty hard to d=
eploy and troubleshoot even more so in a multi-vendor fashion, it would be =
even harder if behaviors like proxies, behave differently.=0A=
=0A=
Hope it makes sense=0A=
=0A=
Thanks,=0A=
=0A=
----------=0A=
Daniel Bernier=0A=
=0A=
________________________________________=0A=
From: spring <spring-bounces@ietf.org> on behalf of Jeff Tantsura <jefftant=
.ietf@gmail.com>=0A=
Sent: Wednesday, October 18, 2017 4:34 PM=0A=
To: Francois Clad (fclad); spring@ietf.org=0A=
Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt=0A=
=0A=
Hi Francois,=0A=
=0A=
The draft has been published as the Standards Track document.=0A=
What is it you have been trying to standardize?=0A=
=0A=
Thanks!=0A=
=0A=
Cheers,=0A=
Jeff=0A=
=0A=
-----Original Message-----=0A=
From: spring <spring-bounces@ietf.org> on behalf of "Francois Clad (fclad)"=
 <fclad@cisco.com>=0A=
Date: Wednesday, October 18, 2017 at 07:46=0A=
To: "spring@ietf.org" <spring@ietf.org>=0A=
Subject: [spring] FW: New Version Notification for draft-clad-spring-segmen=
t-routing-service-chaining-00.txt=0A=
=0A=
    Hello,=0A=
=0A=
    We have just submitted draft-clad-spring-segment-routing-service-chaini=
ng-00.=0A=
=0A=
    Any feedback is welcome.=0A=
=0A=
    Regards,=0A=
    Francois=0A=
=0A=
    On 06/10/2017, 21:32, "internet-drafts@ietf.org" <internet-drafts@ietf.=
org> wrote:=0A=
=0A=
=0A=
        A new version of I-D, draft-clad-spring-segment-routing-service-cha=
ining-00.txt=0A=
        has been successfully submitted by Francois Clad and posted to the=
=0A=
        IETF repository.=0A=
=0A=
        Name:           draft-clad-spring-segment-routing-service-chaining=
=0A=
        Revision:       00=0A=
        Title:          Segment Routing for Service Chaining=0A=
        Document date:  2017-10-06=0A=
        Group:          Individual Submission=0A=
        Pages:          24=0A=
        URL:            https://www.ietf.org/internet-drafts/draft-clad-spr=
ing-segment-routing-service-chaining-00.txt=0A=
        Status:         https://datatracker.ietf.org/doc/draft-clad-spring-=
segment-routing-service-chaining/=0A=
        Htmlized:       https://tools.ietf.org/html/draft-clad-spring-segme=
nt-routing-service-chaining-00=0A=
        Htmlized:       https://datatracker.ietf.org/doc/html/draft-clad-sp=
ring-segment-routing-service-chaining-00=0A=
=0A=
=0A=
        Abstract:=0A=
           This document defines data plane functionality required to imple=
ment=0A=
           service segments and achieve service chaining with MPLS and IPv6=
, as=0A=
           described in the Segment Routing architecture.=0A=
=0A=
=0A=
=0A=
=0A=
        Please note that it may take a couple of minutes from the time of s=
ubmission=0A=
        until the htmlized version and diff are available at tools.ietf.org=
.=0A=
=0A=
        The IETF Secretariat=0A=
=0A=
=0A=
=0A=
    _______________________________________________=0A=
    spring mailing list=0A=
    spring@ietf.org=0A=
    https://www.ietf.org/mailman/listinfo/spring=0A=
=0A=
=0A=
=0A=
_______________________________________________=0A=
spring mailing list=0A=
spring@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/spring=0A=


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From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Bernier, Daniel" <daniel.bernier@bell.ca>, "Francois Clad (fclad)" <fclad@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Message-ID: <2FF1A099-4247-4E36-94C1-5B51AB6AD136@gmail.com>
Thread-Topic: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Daniel,

Thank you for taking the microphone.
Perhaps my question wasn=E2=80=99t clear =E2=80=93 I=E2=80=99m completely with you on the nee=
d of SFC SR properly documented, however the way document reads =E2=80=93 it defin=
es number of behaviors/functions and provides some ideas how those could be =
implemented. Hence my question, whether you think Informational track would =
be more appropriate.

Thanks!  =20

Cheers,
Jeff

-----Original Message-----
From: "Bernier, Daniel" <daniel.bernier@bell.ca>
Date: Tuesday, October 24, 2017 at 09:35
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Francois Clad (fclad)" <fclad=
@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt

    Hi Jeff,=20
   =20
    Do you mind if I take the microphone on this one?
   =20
    The expired draft-homma (ref: https://tools.ietf.org/html/draft-homma-s=
fc-forwarding-methods-analysis-05#page-23 ) on SFC forwarding methods detail=
ed pretty well the various options for forwarding in the context of service =
chaining and in particular the value for SPs into the use of stacked headers=
 but also potential caveats or required enhancements at the time of writing.=
 =20
   =20
    Following on that thought, I think it becomes essential that SPRING add=
resses these caveats/enhancements.=20
   =20
    And contrary to Alvaro=E2=80=99s comment in his review of draft-ietf-spring-s=
egment-routing-mpls (ref: https://mailarchive.ietf.org/arch/msg/spring/97KtD=
ebyroHfuNvllpNVb0s66H8/?qid=3D75cfe3b3b0f6d44817785cc576610ac3 ). I believe it=
 also becomes apparent that answering SFC is =E2=80=9Cvital=E2=80=9D. As it was part of =
the SR architecture drafts from the beginning (ref:  https://tools.ietf.org/=
html/draft-filsfils-rtgwg-segment-routing-00#page-23 ). Even more reason to =
address this in SPRING.
   =20
    So, going back to your question, for us operators, I think it is essent=
ial that required forwarding behaviors, such as proxy mechanisms leveraging =
SR, get standardized so we can get interoperability and predictability betwe=
en implementations. Be it in software or hardware.=20
   =20
    For an SP, the notion of =E2=80=9Cservice-chains=E2=80=9D is currently pretty hard =
to deploy and troubleshoot even more so in a multi-vendor fashion, it would =
be even harder if behaviors like proxies, behave differently.
   =20
    Hope it makes sense
   =20
    Thanks,
   =20
    ----------
    Daniel Bernier
   =20
    ________________________________________
    From: spring <spring-bounces@ietf.org> on behalf of Jeff Tantsura <jeff=
tant.ietf@gmail.com>
    Sent: Wednesday, October 18, 2017 4:34 PM
    To: Francois Clad (fclad); spring@ietf.org
    Subject: Re: [spring] FW: New Version Notification for draft-clad-sprin=
g-segment-routing-service-chaining-00.txt
   =20
    Hi Francois,
   =20
    The draft has been published as the Standards Track document.
    What is it you have been trying to standardize?
   =20
    Thanks!
   =20
    Cheers,
    Jeff
   =20
    -----Original Message-----
    From: spring <spring-bounces@ietf.org> on behalf of "Francois Clad (fcl=
ad)" <fclad@cisco.com>
    Date: Wednesday, October 18, 2017 at 07:46
    To: "spring@ietf.org" <spring@ietf.org>
    Subject: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt
   =20
        Hello,
   =20
        We have just submitted draft-clad-spring-segment-routing-service-ch=
aining-00.
   =20
        Any feedback is welcome.
   =20
        Regards,
        Francois
   =20
        On 06/10/2017, 21:32, "internet-drafts@ietf.org" <internet-drafts@i=
etf.org> wrote:
   =20
   =20
            A new version of I-D, draft-clad-spring-segment-routing-service=
-chaining-00.txt
            has been successfully submitted by Francois Clad and posted to =
the
            IETF repository.
   =20
            Name:           draft-clad-spring-segment-routing-service-chain=
ing
            Revision:       00
            Title:          Segment Routing for Service Chaining
            Document date:  2017-10-06
            Group:          Individual Submission
            Pages:          24
            URL:            https://www.ietf.org/internet-drafts/draft-clad=
-spring-segment-routing-service-chaining-00.txt
            Status:         https://datatracker.ietf.org/doc/draft-clad-spr=
ing-segment-routing-service-chaining/
            Htmlized:       https://tools.ietf.org/html/draft-clad-spring-s=
egment-routing-service-chaining-00
            Htmlized:       https://datatracker.ietf.org/doc/html/draft-cla=
d-spring-segment-routing-service-chaining-00
   =20
   =20
            Abstract:
               This document defines data plane functionality required to i=
mplement
               service segments and achieve service chaining with MPLS and =
IPv6, as
               described in the Segment Routing architecture.
   =20
   =20
   =20
   =20
            Please note that it may take a couple of minutes from the time =
of submission
            until the htmlized version and diff are available at tools.ietf=
.org.
   =20
            The IETF Secretariat
   =20
   =20
   =20
        _______________________________________________
        spring mailing list
        spring@ietf.org
        https://www.ietf.org/mailman/listinfo/spring
   =20
   =20
   =20
    _______________________________________________
    spring mailing list
    spring@ietf.org
    https://www.ietf.org/mailman/listinfo/spring
   =20



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Subject: [spring] Milestones changed for spring WG
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Changed milestone "One or more control protocol extensions requirements
documents. ", set description to "One or more control protocol extensions
requirements documents.".

Changed milestone "SPRING YANG model submitted to IESG", set state to active
from review, accepting new milestone.

URL: https://datatracker.ietf.org/wg/spring/about/


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From: "Bernier, Daniel" <daniel.bernier@bell.ca>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Francois Clad (fclad)" <fclad@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/gu7P7lpwQhUofsgct6UILvu65eI>
Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-segment-routing-service-chaining-00.txt
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Hi Jeff, =0A=
=0A=
Sorry about the confusion.=0A=
=0A=
Personally, I would like to have it in a standard track so we end-up with a=
 reference implementation that everyone can fall back to and ensure consist=
ency and interoperability. Much like was being done with https://tools.ietf=
.org/html/draft-ietf-bess-service-chaining-03.=0A=
There will always be options to diverge and build custom implementations bu=
t with a referenced standard, it makes it easier for us.=0A=
=0A=
Hope that's clearer=0A=
=0A=
Thanks,=0A=
=0A=
Daniel Bernier=0A=
=0A=
________________________________________=0A=
From: Jeff Tantsura <jefftant.ietf@gmail.com>=0A=
Sent: Tuesday, October 24, 2017 1:40 PM=0A=
To: Bernier, Daniel; Francois Clad (fclad); spring@ietf.org=0A=
Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt=0A=
=0A=
Hi Daniel,=0A=
=0A=
Thank you for taking the microphone.=0A=
Perhaps my question wasn=92t clear =96 I=92m completely with you on the nee=
d of SFC SR properly documented, however the way document reads =96 it defi=
nes number of behaviors/functions and provides some ideas how those could b=
e implemented. Hence my question, whether you think Informational track wou=
ld be more appropriate.=0A=
=0A=
Thanks!=0A=
=0A=
Cheers,=0A=
Jeff=0A=
=0A=
-----Original Message-----=0A=
From: "Bernier, Daniel" <daniel.bernier@bell.ca>=0A=
Date: Tuesday, October 24, 2017 at 09:35=0A=
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Francois Clad (fclad)" <fclad=
@cisco.com>, "spring@ietf.org" <spring@ietf.org>=0A=
Subject: Re: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt=0A=
=0A=
    Hi Jeff,=0A=
=0A=
    Do you mind if I take the microphone on this one?=0A=
=0A=
    The expired draft-homma (ref: https://tools.ietf.org/html/draft-homma-s=
fc-forwarding-methods-analysis-05#page-23 ) on SFC forwarding methods detai=
led pretty well the various options for forwarding in the context of servic=
e chaining and in particular the value for SPs into the use of stacked head=
ers but also potential caveats or required enhancements at the time of writ=
ing.=0A=
=0A=
    Following on that thought, I think it becomes essential that SPRING add=
resses these caveats/enhancements.=0A=
=0A=
    And contrary to Alvaro=92s comment in his review of draft-ietf-spring-s=
egment-routing-mpls (ref: https://mailarchive.ietf.org/arch/msg/spring/97Kt=
DebyroHfuNvllpNVb0s66H8/?qid=3D75cfe3b3b0f6d44817785cc576610ac3 ). I believ=
e it also becomes apparent that answering SFC is =93vital=94. As it was par=
t of the SR architecture drafts from the beginning (ref:  https://tools.iet=
f.org/html/draft-filsfils-rtgwg-segment-routing-00#page-23 ). Even more rea=
son to address this in SPRING.=0A=
=0A=
    So, going back to your question, for us operators, I think it is essent=
ial that required forwarding behaviors, such as proxy mechanisms leveraging=
 SR, get standardized so we can get interoperability and predictability bet=
ween implementations. Be it in software or hardware.=0A=
=0A=
    For an SP, the notion of =93service-chains=94 is currently pretty hard =
to deploy and troubleshoot even more so in a multi-vendor fashion, it would=
 be even harder if behaviors like proxies, behave differently.=0A=
=0A=
    Hope it makes sense=0A=
=0A=
    Thanks,=0A=
=0A=
    ----------=0A=
    Daniel Bernier=0A=
=0A=
    ________________________________________=0A=
    From: spring <spring-bounces@ietf.org> on behalf of Jeff Tantsura <jeff=
tant.ietf@gmail.com>=0A=
    Sent: Wednesday, October 18, 2017 4:34 PM=0A=
    To: Francois Clad (fclad); spring@ietf.org=0A=
    Subject: Re: [spring] FW: New Version Notification for draft-clad-sprin=
g-segment-routing-service-chaining-00.txt=0A=
=0A=
    Hi Francois,=0A=
=0A=
    The draft has been published as the Standards Track document.=0A=
    What is it you have been trying to standardize?=0A=
=0A=
    Thanks!=0A=
=0A=
    Cheers,=0A=
    Jeff=0A=
=0A=
    -----Original Message-----=0A=
    From: spring <spring-bounces@ietf.org> on behalf of "Francois Clad (fcl=
ad)" <fclad@cisco.com>=0A=
    Date: Wednesday, October 18, 2017 at 07:46=0A=
    To: "spring@ietf.org" <spring@ietf.org>=0A=
    Subject: [spring] FW: New Version Notification for draft-clad-spring-se=
gment-routing-service-chaining-00.txt=0A=
=0A=
        Hello,=0A=
=0A=
        We have just submitted draft-clad-spring-segment-routing-service-ch=
aining-00.=0A=
=0A=
        Any feedback is welcome.=0A=
=0A=
        Regards,=0A=
        Francois=0A=
=0A=
        On 06/10/2017, 21:32, "internet-drafts@ietf.org" <internet-drafts@i=
etf.org> wrote:=0A=
=0A=
=0A=
            A new version of I-D, draft-clad-spring-segment-routing-service=
-chaining-00.txt=0A=
            has been successfully submitted by Francois Clad and posted to =
the=0A=
            IETF repository.=0A=
=0A=
            Name:           draft-clad-spring-segment-routing-service-chain=
ing=0A=
            Revision:       00=0A=
            Title:          Segment Routing for Service Chaining=0A=
            Document date:  2017-10-06=0A=
            Group:          Individual Submission=0A=
            Pages:          24=0A=
            URL:            https://www.ietf.org/internet-drafts/draft-clad=
-spring-segment-routing-service-chaining-00.txt=0A=
            Status:         https://datatracker.ietf.org/doc/draft-clad-spr=
ing-segment-routing-service-chaining/=0A=
            Htmlized:       https://tools.ietf.org/html/draft-clad-spring-s=
egment-routing-service-chaining-00=0A=
            Htmlized:       https://datatracker.ietf.org/doc/html/draft-cla=
d-spring-segment-routing-service-chaining-00=0A=
=0A=
=0A=
            Abstract:=0A=
               This document defines data plane functionality required to i=
mplement=0A=
               service segments and achieve service chaining with MPLS and =
IPv6, as=0A=
               described in the Segment Routing architecture.=0A=
=0A=
=0A=
=0A=
=0A=
            Please note that it may take a couple of minutes from the time =
of submission=0A=
            until the htmlized version and diff are available at tools.ietf=
.org.=0A=
=0A=
            The IETF Secretariat=0A=
=0A=
=0A=
=0A=
        _______________________________________________=0A=
        spring mailing list=0A=
        spring@ietf.org=0A=
        https://www.ietf.org/mailman/listinfo/spring=0A=
=0A=
=0A=
=0A=
    _______________________________________________=0A=
    spring mailing list=0A=
    spring@ietf.org=0A=
    https://www.ietf.org/mailman/listinfo/spring=0A=
=0A=
=0A=


From nobody Thu Oct 26 09:25:38 2017
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 26 Oct 2017 09:25:31 -0700
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Subject: [spring] Fwd: Updates to draft-mirsky-bfd* drafts.
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Now to the SPRING WG. Looking forward to your comments, questions.

Regards,
Greg
---------- Forwarded message ----------
From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, Oct 24, 2017 at 12:07 PM
Subject: Updates to draft-mirsky-bfd* drafts.
To: "mpls@ietf.org" <mpls@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>,
spring-chairs@ietf.org


Dear All,
updated versions of drafts first presented in Prague have been published:

   - BFD in Demand Mode over Point-to-Point MPLS LSP
   <https://datatracker.ietf.org/doc/html/draft-mirsky-bfd-mpls-demand-02>
   - Bidirectional Forwarding Detection (BFD) in Segment Routing Networks
   Using MPLS Dataplane
   <https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-02>
   - BFD for Multipoint Networks over Point-to-Multi-Point MPLS LSP
   <https://datatracker.ietf.org/doc/html/draft-mirsky-mpls-p2mp-bfd-02>

Also new work Clarifying Use of LSP Ping to Bootstrap BFD over MPLS LSP
<https://tools.ietf.org/html/draft-mirsky-mpls-bfd-bootstrap-clarify-00> has
been published recently.

Your comments, questions, suggestions always welcome and greatly
appreciated. Looking forward to present them and discuss them in Singapore.

Regards,
Greg

--94eb2c1a6538ff0524055c759e89
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<div dir=3D"ltr">Now to the SPRING WG. Looking forward to your comments, qu=
estions.<div><br></div><div>Regards,</div><div>Greg<br><div class=3D"gmail_=
quote">---------- Forwarded message ----------<br>From: <b class=3D"gmail_s=
endername">Greg Mirsky</b> <span dir=3D"ltr">&lt;<a href=3D"mailto:gregimir=
sky@gmail.com">gregimirsky@gmail.com</a>&gt;</span><br>Date: Tue, Oct 24, 2=
017 at 12:07 PM<br>Subject: Updates to draft-mirsky-bfd* drafts.<br>To: &qu=
ot;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>&quot; &lt;<a href=3D"=
mailto:mpls@ietf.org">mpls@ietf.org</a>&gt;, &quot;<a href=3D"mailto:rtg-bf=
d@ietf.org">rtg-bfd@ietf.org</a>&quot; &lt;<a href=3D"mailto:rtg-bfd@ietf.o=
rg">rtg-bfd@ietf.org</a>&gt;, <a href=3D"mailto:spring-chairs@ietf.org">spr=
ing-chairs@ietf.org</a><br><br><br><div dir=3D"ltr">Dear All,<div>updated v=
ersions of drafts first presented in Prague have been published:</div><div>=
<ul><li><a href=3D"https://datatracker.ietf.org/doc/html/draft-mirsky-bfd-m=
pls-demand-02" target=3D"_blank">BFD in Demand Mode over Point-to-Point MPL=
S LSP</a><br></li><li><a href=3D"https://datatracker.ietf.org/doc/html/draf=
t-mirsky-spring-bfd-02" target=3D"_blank">Bidirectional Forwarding Detectio=
n (BFD) in Segment Routing Networks Using MPLS Dataplane</a><br></li><li><a=
 href=3D"https://datatracker.ietf.org/doc/html/draft-mirsky-mpls-p2mp-bfd-0=
2" target=3D"_blank">BFD for Multipoint Networks over Point-to-Multi-Point =
MPLS LSP</a><br></li></ul><div>Also new work=C2=A0<span style=3D"font-size:=
12.8px"><a href=3D"https://tools.ietf.org/html/draft-mirsky-mpls-bfd-bootst=
rap-clarify-00" target=3D"_blank">Clarifying Use of LSP Ping to Bootstrap B=
FD over MPLS LSP</a>=C2=A0has been published recently.</span></div><div><sp=
an style=3D"font-size:12.8px"><br></span></div><div>Your comments, question=
s, suggestions always welcome and greatly appreciated. Looking forward to p=
resent them and discuss them in Singapore.</div></div><div><br></div><div>R=
egards,</div><div>Greg</div></div>
</div><br></div></div>

--94eb2c1a6538ff0524055c759e89--


From nobody Sat Oct 28 07:39:35 2017
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing Architecture
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Les Ginsberg
                          Bruno Decraene
                          Stephane Litkowski
                          Rob Shakir
	Filename        : draft-ietf-spring-segment-routing-13.txt
	Pages           : 29
	Date            : 2017-10-28

Abstract:
   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through an ordered list of instructions, called
   segments.  A segment can represent any instruction, topological or
   service-based.  A segment can have a semantic local to an SR node or
   global within an SR domain.  SR allows to enforce a flow through any
   topological path while maintaining per-flow state only at the ingress
   nodes to the SR domain.

   Segment Routing can be directly applied to the MPLS architecture with
   no change on the forwarding plane.  A segment is encoded as an MPLS
   label.  An ordered list of segments is encoded as a stack of labels.
   The segment to process is on the top of the stack.  Upon completion
   of a segment, the related label is popped from the stack.

   Segment Routing can be applied to the IPv6 architecture, with a new
   type of routing header.  A segment is encoded as an IPv6 address.  An
   ordered list of segments is encoded as an ordered list of IPv6
   addresses in the routing header.  The active segment is indicated by
   the Destination Address of the packet.  The next active segment is
   indicated by a pointer in the new routing header.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-13
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-13


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

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


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "draft-ietf-spring-segment-routing@ietf.org" <draft-ietf-spring-segment-routing@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "spring@ietf.org" <spring@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
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From nobody Sun Oct 29 02:20:25 2017
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-central-epe-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing Centralized BGP Egress Peer Engineering
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Gaurav Dawra
                          Ebben Aries
                          Dmitry Afanasiev
	Filename        : draft-ietf-spring-segment-routing-central-epe-07.txt
	Pages           : 19
	Date            : 2017-10-28

Abstract:
   Segment Routing (SR) leverages source routing.  A node steers a
   packet through a controlled set of instructions, called segments, by
   prepending the packet with an SR header.  A segment can represent any
   instruction topological or service-based.  SR allows to enforce a
   flow through any topological path while maintaining per-flow state
   only at the ingress node of the SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   dataplane with no change on the forwarding plane.  It requires a
   minor extension to the existing link-state routing protocols.

   This document illustrates the application of Segment Routing to solve
   the BGP Egress Peer Engineering (BGP-EPE) requirement.  The SR-based
   BGP-EPE solution allows a centralized (Software Defined Network, SDN)
   controller to program any egress peer policy at ingress border
   routers or at hosts within the domain.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-central-epe/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-central-epe-07
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-central-epe-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-central-epe-07


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

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


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Subject: [spring] Agenda request: draft-farrel-spring-sr-domain-interconnect-01.txt
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Hi,

This document sets the background for draft-ietf-bess-datacenter-gateway and may
be a helpful read to explain how the pieces fit together.

In Prague we got told off (not very much :-) for advancing
draft-ietf-bess-datacenter-gateway (then draft-drake-bess-datacenter-gateway) in
BESS without any discussion in SPRING, so we would like to request an agenda
slot for draft-farrel-spring-sr-domain-interconnect in Singapore.

Thanks,
Adrian

> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: 29 October 2017 22:25
> To: i-d-announce@ietf.org
> Subject: I-D Action: draft-farrel-spring-sr-domain-interconnect-01.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> 
> 
>         Title           : Interconnection of Segment Routing Domains - Problem
> Statement and Solution Landscape
>         Authors         : Adrian Farrel
>                           John Drake
> 	Filename        : draft-farrel-spring-sr-domain-interconnect-01.txt
> 	Pages           : 33
> 	Date            : 2017-10-29
> 
> Abstract:
>    Segment Routing (SR) is now a popular forwarding paradigm for use in
>    MPLS and IPv6 networks.  It is typically deployed in discrete domains
>    that may be data centers, access networks, or other networks that are
>    under the control of a single operator and that can easily be
>    upgraded to support this new technology.
> 
>    Traffic originating in one SR domain often terminates in another SR
>    domain, but must transit a backbone network that provides
>    interconnection between those domains.
> 
>    This document describes a mechanism for providing connectivity
>    between SR domains to enable end-to-end or domain-to-domain traffic
>    engineering.
> 
>    The approach described: allows connectivity between SR domains,
>    utilizes traffic engineering mechanisms (RSVP-TE or Segment Routing)
>    across the backbone network, makes heavy use of pre-existing
>    technologies requiring the specifications of very few additional
>    mechanisms.
> 
>    This document some background and a problem statement, explains the
>    solution mechanism, and provides examples.  It does not define any
>    new protocol mechanisms.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-farrel-spring-sr-domain-interconnect/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-farrel-spring-sr-domain-interconnect-01
> https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-
> interconnect-01
> 
> A diff from the previous version is available at:
>
https://www.ietf.org/rfcdiff?url2=draft-farrel-spring-sr-domain-interconnect-01
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


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From: "Gaurav Dawra (gdawra)" <gdawra@cisco.com>
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Thread-Topic: [spring] AD Review of draft-ietf-spring-segment-routing-central-epe-06
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From nobody Mon Oct 30 06:55:19 2017
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <spring@ietf.org>
Date: Mon, 30 Oct 2017 13:54:44 -0000
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Subject: [spring] FW: I-D Action: draft-bryant-mpls-unified-ip-sr-03.txt
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Hi SPRING,

While this document is targeted at the MPLS WG and seems to fit within their
charter, it obviously has a lot to do with SPRING.

We would very much appreciate review from the WG, and if there is time on the
agenda and the chairs think it is a good idea, we would welcome the chance to
set out the ideas in Singapore.

Thanks,
Adrian

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: 30 October 2017 13:06
> To: i-d-announce@ietf.org
> Cc: mpls@ietf.org
> Subject: [mpls] I-D Action: draft-bryant-mpls-unified-ip-sr-03.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> This draft is a work item of the Multiprotocol Label Switching WG of the IETF.
> 
>         Title           : MPLS Segment Routing in IP Networks
>         Authors         : Stewart Bryant
>                           Adrian Farrel
>                           John Drake
>                           Jeff Tantsura
> 	Filename        : draft-bryant-mpls-unified-ip-sr-03.txt
> 	Pages           : 18
> 	Date            : 2017-10-30
> 
> Abstract:
>    Segment routing is a source routed forwarding method that allows
>    packets to be steered through a network on paths other than the
>    shortest path derived from the routing protocol.  The approach uses
>    information encoded in the packet header to partially or completely
>    specify the route the packet takes through the network, and does not
>    make use of a signaling protocol to pre-install paths in the network.
> 
>    Two different encapsulations have been defined to enable segment
>    routing in an MPLS network or in an IPv6 network.  While
>    acknowledging that there is a strong need to support segment routing
>    in both environments, this document defines a mechanism to carry MPLS
>    segment routing packets encapsulated in UDP.  The resulting approach
>    is applicable to both IPv4 and IPv6 networks without the need for any
>    changes to the IP or segment routing specifications.
> 
>    This document makes no changes to the segment routing architecture
>    and builds on existing protocol mechanisms such as the encapsulation
>    of MPLS within UDP defined in RFC 7510.
> 
>    No new procedures are introduced, but existing mechanisms are
>    combined to achieve the desired result.
> 
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-bryant-mpls-unified-ip-sr/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-bryant-mpls-unified-ip-sr-03
> https://datatracker.ietf.org/doc/html/draft-bryant-mpls-unified-ip-sr-03
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-bryant-mpls-unified-ip-sr-03
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Mon Oct 30 08:59:06 2017
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-mpls-11.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing with MPLS data plane
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Ahmed Bashandy
                          Bruno Decraene
                          Stephane Litkowski
                          Rob Shakir
	Filename        : draft-ietf-spring-segment-routing-mpls-11.txt
	Pages           : 19
	Date            : 2017-10-30

Abstract:
   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through a controlled set of instructions, called
   segments, by prepending the packet with an SR header.  In the MPLS
   dataplane, the SR header is instantiated through a label stack. This
   document specifies the forwarding behavior to allow instantiating SR
   over the MPLS dataplane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/

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https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-11
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-mpls-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-mpls-11


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until the htmlized version and diff are available at tools.ietf.org.

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ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Oct 30 09:13:20 2017
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-msdc-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : BGP-Prefix Segment in large-scale data centers
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Jon Mitchell
                          Ebben Aries
                          Petr Lapukhov
	Filename        : draft-ietf-spring-segment-routing-msdc-06.txt
	Pages           : 25
	Date            : 2017-10-30

Abstract:
   This document describes the motivation and benefits for applying
   segment routing in BGP-based large-scale data-centers.  It describes
   the design to deploy segment routing in those data-centers, for both
   the MPLS and IPv6 dataplanes.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-msdc/

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https://tools.ietf.org/html/draft-ietf-spring-segment-routing-msdc-06
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-msdc-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-msdc-06


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

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From nobody Mon Oct 30 10:47:12 2017
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CC: "spring@ietf.org" <spring@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "draft-ietf-spring-segment-routing-central-epe@Ietf.org" <draft-ietf-spring-segment-routing-central-epe@Ietf.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>
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Date: Mon, 30 Oct 2017 17:47:04 +0000
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Subject: Re: [spring] AD Review of draft-ietf-spring-segment-routing-central-epe-06
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From: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
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I just checked the IPR section in ietf.org. The IPR disclosure for this 
draft can be found in
https://datatracker.ietf.org/ipr/search/?draft=draft-ietf-spring-segment-routing-mpls&submit=draft&rfc=&doctitle=&group=&holder=&iprtitle=&patent=

Thanks

Ahmed

On 10/30/2017 11:12 AM, Ahmed Bashandy (bashandy) wrote:
>
> Sorry for the late reply and thanks a lot for the thorough review.
>
> We have just uploaded version 11 of the draft.
>
> See replies inline “#Ahmed” to your comments
>
> Thanks
>
> Ahmed
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of *Alvaro 
> Retana (aretana)
> *Sent:* Wednesday, August 23, 2017 7:39 PM
> *To:* draft-ietf-spring-segment-routing-mpls@ietf.org 
> <mailto:draft-ietf-spring-segment-routing-mpls@ietf.org>
> *Cc:* spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>; 
> spring@ietf.org <mailto:spring@ietf.org>; Martin Vigoureux 
> <martin.vigoureux@nokia.com <mailto:martin.vigoureux@nokia.com>>
> *Subject:* [spring] AD Review of draft-ietf-spring-segment-routing-mpls-10
>
> Dear authors:
>
> I just finished reading this document.  Please take a look at my 
> comments below.
>
> The main questions/concerns that I have related to this document is 
> not just for the authors, but for the Shepherd and the Chairs too.
>
> Q1. Why is this document on the Standards Track? From the 
> Introduction: “This drafts describes how Segment Routing operates on 
> top of the MPLS data plane.”  Describes, yes.  On the other hand, the 
> Shepherd’s write-up says that it “specifies the generic functions of 
> the architecture” – I don’t see a specification, just a description.  
> As such, I think this document should be Informational.
>
> #Ahmed: The new version of the draft specifies many things that are 
> applicable to instantiation of SR over MPLS
>
> Q2. Section 2. (MPLS Instantiation of Segment Routing) is the only one 
> with any real content…but there are only a couple of things in it that 
> are not in the Architecture document: the introduction of the SRLB, 
> and some words about the index – both of which should be really 
> explained in the Architecture document, and not here.  I wonder what 
> the value of publishing this document really is.  What long-term 
> archival value does it provide?
>
> #Ahmed: The long term plan is to move details of MPLS-specific 
> specifications to this document and keep the architecture document 
> more general
>
> Q3. I also have to wonder about the IPR declared for this document.  
> If most of the information here is already defined, described or 
> specified in draft-ietf-spring-segment-routing, should the IPR 
> declaration apply to that document as well (or maybe instead of this 
> one)?  It is not the IETF’s role (including the WG) to discuss whether 
> a piece of IPR is valid or not – I just want to make sure the 
> disclosures apply to the right document.
>
> #Ahmed: We will make sure that all IPR is declared
>
> I didn’t find a discussion on the list about any of these points.
>
> Thanks!
>
> Alvaro.
>
> Major
>
> M1. Section 2. (MPLS Instantiation of Segment Routing) explains how 
> “in the MPLS instantiation, the SID values are allocated within a 
> reduced 20-bit space out of the 32-bit SID space.” However, I couldn’t 
> find where draft-ietf-spring-segment-routing defines the SID space as 
> using 32 bits (or any other length).  In fact, the closest that 
> document comes is when it defines an SID and mentions “Examples of 
> SIDs are: an MPLS label, an index value in an MPLS label space, an 
> IPv6 address.”   I’m assuming the “32-bit SID space” comes from the 
> fact that the extensions define an SID of that length.  All this is to 
> say that as you describe how SR operates in the MPLS dataplane, do so 
> not explicitly depending on the implementation of the extensions 
> (which in fact seem to already account for different lengths).
>
> #Ahmed: The part that talks about the reduced 20 bit spaced has been 
> removed. Instead the beginning of section 2.2 clearly specifies that a 
> SID is an MPLS label and if it is an index it should be inside the 
> SRGB. Section 2.4 specifies how to translate the Index to a label 
> within the SRGB
>
> M2. [I mentioned these issues in the review of 
> draft-ietf-spring-segment-routing as well.]
>
> M2.1. “The notion of indexed global segment, defined in 
> [I-D.ietf-spring-segment-routing]…”  That document doesn’t properly 
> define the concept/use of the index.  There are several mentions in 
> this document that I think rely on a proper definition/discussion of 
> the concept.
>
> #Ahmed: Section 2.4 specify how to translate the Index to a label 
> within the SRGB. The architecture draft defines the concept of an index
>
> M2.2. The concept of an SRLB is not defined in the Architecture 
> document either.
>
> #Ahmed: The latest version of the architecture document defines the SRLB
>
> M3. Still in Section 2, from this text:
>
>       * When different SRGBs are used, the outgoing label value is set
>
>          as: [SRGB(next_hop)+index].  If the index can't be applied to
>
>          the SRGB (i.e.: if the index points outside the SRGB of the
>
> next-hop or the next-hop has not advertised a valid SRGB), then
>
>          no outgoing label value can be computed and the next-hop MUST
>
>          be considered as not supporting the MPLS operations for that
>
> particular SID.
>
> …several questions/comments…
>
> M3.1. [minor] I hope to see an explanation of the 
> “[SRGB(next_hop)+index]” notation.
>
> #Ahmed: Section 2.4 clearly specifies how to map an index to a label 
> within the SRGB
>
> M3.2. What is a “valid SRGB”?  I don’t think the validity of the SRGB 
> is described in the Architecture document.
>
> #Ahmed: The term “valid SRGB” has been removed. Instead Section 2.3 
> specifies the conditions an SRGB must satisfy
>
> M3.3. I’m assuming that once the “next-hop MUST be considered as not 
> supporting” then the packets are dropped, right?
>
> #Ahmed: Sections 2.8 and 2.9 specify the forwarding behavior. I hope 
> they are sufficiently clear
>
> M3.4. [Maybe I’m missing something obvious here.]  Going back to the 
> validity of the SRGB advertised by a specific node, shouldn’t the 
> ingress node verify that before imposing a path that will fail?  But I 
> couldn’t find anything in the Architecture document that talks about 
> the ingress node verifying that the path is valid (including the 
> validity of the SRGB).
>
> #Ahmed: Section 2.8 and 2.9 clearly specify the forwarding behavior 
> for PUSH. I hope they are sufficiently clear. This document also have 
> a reference to [I.D. filsfils-spring-segment-routing-policy] where the 
> discussion about calculating and verifying the values of labels in a 
> stack of labels
>
> M4. Still in Section 2: “As described in 
> [I-D.ietf-spring-segment-routing], using the same SRGB on all nodes 
> within the SR domain eases operations and troubleshooting and is 
> expected to be a deployment guideline.”  As I mentioned in my review 
> of the Architecture document, that document doesn’t contain deployment 
> guidelines related to the SRGB, and it doesn’t describe how “using the 
> same SRGB…eases operations and troubleshooting”.
>
> #Ahmed: The latest version of the architecture document addresses this 
> comment
>
> Minor
>
> P1. The term “service chain” is used in the Abstract.  Given that the 
> concept is not vital to the architecture and that there might be 
> unnecessary confusion with SFC, I would suggest taking it out.
>
> #Ahmed: The term “service chain” has been removed from this draft
>
> P2. Informative References to VPN, VPLS, VPWS, LDP, RSVP-TE…would be nice.
>
> #Ahmed: References to all of this has been removed from this document
>
> P3. Section 2. (MPLS Instantiation of Segment Routing) says that “a 
> controller-driven network…MAY use the control plane to discover the 
> available set of local SIDs”.  The “MAY” implies that there is a 
> choice (i.e. it is optional) and that other discovery mechanisms 
> exist.  What are those other choices?  Note that earlier in this 
> section you already wrote that IGPs are used for flooding the 
> information. s/MAY/may
>
> #Ahmed: This document gives an example of a use of the SRLB. Listing 
> all possible uses of the SRLB is certainly not within the scope of 
> this document.
>
> P4. Section 2: “…the use of the binding segment as specified in 
> [I-D.ietf-spring-segment-routing], also allows to substantially reduce 
> the length of the segment list…”  Nice, but there is no description of 
> the binding segment in draft-ietf-spring-segment-routing.
>
> #Ahmed: The latest version of draft-ietf-spring-segment-routing takes 
> care of defining a binding SID
>
> P5. References.  Please take a look at rfc8174 and update the 
> “Requirements Language” and associated references.
>
> #Ahmed: I agree. I modified the paragraph about requirements language 
> to conform to rfc8174
>
> Nits
>
> N1. I think that the references to *-segment-routing-extensions are 
> superfluous.  BTW, the fourth paragraph of the Introduction uses a 
> reference to *-segment-routing-extensions to point at ISIS/OSPF (the 
> protocols!).
>
> #Ahmed: I agree. Now we have clear references to each IGP extensions 
> separately
>
> N2. It would be very nice if the examples used IPv6 addresses.
>
> #Ahmed: It is just that everyone is used to IPv4 more than IPv6. So we 
> believe using IPv4 is easier for people to understand
>


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    I just checked the IPR section in ietf.org. The IPR disclosure for
    this draft can be found in<br>
<a class="moz-txt-link-freetext" href="https://datatracker.ietf.org/ipr/search/?draft=draft-ietf-spring-segment-routing-mpls&amp;submit=draft&amp;rfc=&amp;doctitle=&amp;group=&amp;holder=&amp;iprtitle=&amp;patent=">https://datatracker.ietf.org/ipr/search/?draft=draft-ietf-spring-segment-routing-mpls&amp;submit=draft&amp;rfc=&amp;doctitle=&amp;group=&amp;holder=&amp;iprtitle=&amp;patent=</a><br>
    <br>
    Thanks<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 10/30/2017 11:12 AM, Ahmed Bashandy
      (bashandy) wrote:<br>
    </div>
    <blockquote
      cite="mid:50d87236662f49bb8a81308dff6abbf5@XCH-RTP-020.cisco.com"
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">Sorry for the late
            reply and thanks a lot for the thorough review.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">We have just uploaded
            version 11 of the draft.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">See replies inline
            “#Ahmed” to your comments<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">Thanks<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">Ahmed<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"><b><span style="font-size:11.0pt">From:</span></b><span
                style="font-size:11.0pt"> spring [<a
                  moz-do-not-send="true"
                  href="mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
                <b>On Behalf Of </b>Alvaro Retana (aretana)<br>
                <b>Sent:</b> Wednesday, August 23, 2017 7:39 PM<br>
                <b>To:</b> <a moz-do-not-send="true"
                  href="mailto:draft-ietf-spring-segment-routing-mpls@ietf.org">draft-ietf-spring-segment-routing-mpls@ietf.org</a><br>
                <b>Cc:</b> <a moz-do-not-send="true"
                  href="mailto:spring-chairs@ietf.org">spring-chairs@ietf.org</a>;
                <a moz-do-not-send="true" href="mailto:spring@ietf.org">
                  spring@ietf.org</a>; Martin Vigoureux &lt;<a
                  moz-do-not-send="true"
                  href="mailto:martin.vigoureux@nokia.com">martin.vigoureux@nokia.com</a>&gt;<br>
                <b>Subject:</b> [spring] AD Review of
                draft-ietf-spring-segment-routing-mpls-10<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Dear
            authors:<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">I just
            finished reading this document.  Please take a look at my
            comments below.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">The main
            questions/concerns that I have related to this document is
            not just for the authors, but for the Shepherd and the
            Chairs too. 
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Q1. Why is
            this document on the Standards Track? From the Introduction:
            “This drafts describes how Segment Routing operates on top
            of the MPLS data plane.”  Describes, yes.  On the other
            hand, the Shepherd’s write-up says that it “specifies the
            generic functions of the architecture” – I don’t see a
            specification, just a description.  As such, I think this
            document should be Informational.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The new
            version of the draft specifies many things that are
            applicable to instantiation of SR over MPLS<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Q2. Section
            2. (MPLS Instantiation of Segment Routing) is the only one
            with any real content…but there are only a couple of things
            in it that are not in the Architecture document: the
            introduction of the SRLB, and some words about the index –
            both of which should be really explained in the Architecture
            document, and not here.  I wonder what the value of
            publishing this document really is.  What long-term archival
            value does it provide?<span style="color:#1F497D"><o:p></o:p></span></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The long term
            plan is to move details of MPLS-specific specifications to
            this document and keep the architecture document more
            general<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Q3. I also
            have to wonder about the IPR declared for this document.  If
            most of the information here is already defined, described
            or specified in draft-ietf-spring-segment-routing, should
            the IPR declaration apply to that document as well (or maybe
            instead of this one)?  It is not the IETF’s role (including
            the WG) to discuss whether a piece of IPR is valid or not –
            I just want to make sure the disclosures apply to the right
            document.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: We will make
            sure that all IPR is declared<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">I didn’t
            find a discussion on the list about any of these points.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Thanks!<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Alvaro.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Major<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M1. Section
            2. (MPLS Instantiation of Segment Routing) explains how “in
            the MPLS instantiation, the SID values are allocated within
            a reduced 20-bit space out of the 32-bit SID space.” 
            However, I couldn’t find where
            draft-ietf-spring-segment-routing defines the SID space as
            using 32 bits (or any other length).  In fact, the closest
            that document comes is when it defines an SID and mentions
            “Examples of SIDs are: an MPLS label, an index value in an
            MPLS label space, an IPv6 address.”   I’m assuming the
            “32-bit SID space” comes from the fact that the extensions
            define an SID of that length.  All this is to say that as
            you describe how SR operates in the MPLS dataplane, do so
            not explicitly depending on the implementation of the
            extensions (which in fact seem to already account for
            different lengths).<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The part that
            talks about the reduced 20 bit spaced has been removed.
            Instead the beginning of section 2.2 clearly specifies that
            a SID is an MPLS label and if it is an index it should be
            inside the SRGB. Section 2.4 specifies how to translate the
            Index to a label within the SRGB</span><span
            style="font-size:11.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M2. [I
            mentioned these issues in the review of
            draft-ietf-spring-segment-routing as well.]<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M2.1. “The
            notion of indexed global segment, defined in
            [I-D.ietf-spring-segment-routing]…”  That document doesn’t
            properly define the concept/use of the index.  There are
            several mentions in this document that I think rely on a
            proper definition/discussion of the concept.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: Section 2.4
            specify how to translate the Index to a label within the
            SRGB. The architecture draft defines the concept of an index<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M2.2. The
            concept of an SRLB is not defined in the Architecture
            document either.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The latest
            version of the architecture document defines the SRLB</span><span
            style="font-size:11.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M3. Still in
            Section 2, from this text:<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">      * 
            When different SRGBs are used, the outgoing label value is
            set<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">         as:
            [SRGB(next_hop)+index].  If the index can't be applied to<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">         the
            SRGB (i.e.: if the index points outside the SRGB of the<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">        
            next-hop or the next-hop has not advertised a valid SRGB),
            then<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">         no
            outgoing label value can be computed and the next-hop MUST<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">         be
            considered as not supporting the MPLS operations for that<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">        
            particular SID.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">…several
            questions/comments…<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M3.1.
            [minor] I hope to see an explanation of the
            “[SRGB(next_hop)+index]” notation.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: Section 2.4
            clearly specifies how to map an index to a label within the
            SRGB<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M3.2. What
            is a “valid SRGB”?  I don’t think the validity of the SRGB
            is described in the Architecture document.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The term
            “valid SRGB” has been removed. Instead Section 2.3 specifies
            the conditions an SRGB must satisfy<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M3.3. I’m
            assuming that once the “next-hop MUST be considered as not
            supporting” then the packets are dropped, right?<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: Sections 2.8
            and 2.9 specify the forwarding behavior. I hope they are
            sufficiently clear<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M3.4. [Maybe
            I’m missing something obvious here.]  Going back to the
            validity of the SRGB advertised by a specific node,
            shouldn’t the ingress node verify that before imposing a
            path that will fail?  But I couldn’t find anything in the
            Architecture document that talks about the ingress node
            verifying that the path is valid (including the validity of
            the SRGB).<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: Section 2.8
            and 2.9 clearly specify the forwarding behavior for PUSH. I
            hope they are sufficiently clear. This document also have a
            reference to [I.D. filsfils-spring-segment-routing-policy]
            where the discussion about calculating and verifying the
            values of labels in a stack of labels</span><span
            style="font-size:11.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">M4. Still in
            Section 2: “As described in
            [I-D.ietf-spring-segment-routing], using the same SRGB on
            all nodes within the SR domain eases operations and
            troubleshooting and is expected to be a deployment
            guideline.”  As I mentioned in my review of the Architecture
            document, that document doesn’t contain deployment
            guidelines related to the SRGB, and it doesn’t describe how
            “using the same SRGB…eases operations and troubleshooting”.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The latest
            version of the architecture document addresses this comment</span><span
            style="font-size:11.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Minor<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">P1. The term
            “service chain” is used in the Abstract.  Given that the
            concept is not vital to the architecture and that there
            might be unnecessary confusion with SFC, I would suggest
            taking it out.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The term
            “service chain” has been removed from this draft<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">P2.
            Informative References to VPN, VPLS, VPWS, LDP,
            RSVP-TE…would be nice.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: References to
            all of this has been removed from this document<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">P3. Section
            2. (MPLS Instantiation of Segment Routing) says that “a
            controller-driven network…MAY use the control plane to
            discover the available set of local SIDs”.  The “MAY”
            implies that there is a choice (i.e. it is optional) and
            that other discovery mechanisms exist.  What are those other
            choices?  Note that earlier in this section you already
            wrote that IGPs are used for flooding the information. 
            s/MAY/may<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: This document
            gives an example of a use of the SRLB. Listing all possible
            uses of the SRLB is certainly not within the scope of this
            document.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">P4. Section
            2: “…the use of the binding segment as specified in
            [I-D.ietf-spring-segment-routing], also allows to
            substantially reduce the length of the segment list…”  Nice,
            but there is no description of the binding segment in
            draft-ietf-spring-segment-routing.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: The latest
            version of draft-ietf-spring-segment-routing takes care of
            defining a binding SID<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">P5.
            References.  Please take a look at rfc8174 and update the
            “Requirements Language” and associated references.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: I agree. I
            modified the paragraph about requirements language to
            conform to rfc8174<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Nits<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">N1. I think
            that the references to *-segment-routing-extensions are
            superfluous.  BTW, the fourth paragraph of the Introduction
            uses a reference to *-segment-routing-extensions to point at
            ISIS/OSPF (the protocols!).<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: I agree. Now
            we have clear references to each IGP extensions separately<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">N2. It would
            be very nice if the examples used IPv6 addresses.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:11.0pt;color:#1F497D">#Ahmed: It is just
            that everyone is used to IPv4 more than IPv6. So we believe
            using IPv4 is easier for people to understand<o:p></o:p></span></p>
      </div>
    </blockquote>
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From: "Weiqiang Cheng" <chengweiqiang@chinamobile.com>
To: <martin.vigoureux@nokia.com>
Cc: <spring-chairs@ietf.org>, <spring@ietf.org>, "'Lei Wang'" <wangleiyj@chinamobile.com>, "'Royi Zigler'" <royi.zigler@broadcom.com>, "'Shuangping Zhan'" <zhan.shuangping@zte.com.cn>, "'Mach Chen'" <mach.chen@huawei.com>, "'Han Li'" <lihan@chinamobile.com>, "'gengliang'" <gengliang@chinamobile.com>
Date: Tue, 31 Oct 2017 10:30:33 +0800
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Subject: Re: [spring] Slots requests for SPRING WG session - IETF 100 - Singapore
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Hi Martin and all,
   We authors would like to apply a time slot for following draft:
   Draft name :  draft-cheng-spring-mpls-path-segment
   Speaker: Liang Geng, Mach Chen
   Duration: 10min

 

Best Regards,

Weiqiang Cheng

Research Institute of China Mobile

Department of Network Technology

e-mail:chengweiqiang@chinamobile.com

mobile: +86 138 1001 9089

 


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style=3D'margin-bottom:7.5pt;background:white'><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Consolas;color:#333333'>Hi Martin =
and all,<o:p></o:p></span></pre><pre =
style=3D'margin-bottom:7.5pt;background:white'><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Consolas;color:#333333'>&nbsp;&nbsp=
; We authors would like to apply a time slot for following =
draft:<o:p></o:p></span></pre><pre =
style=3D'margin-bottom:7.5pt;background:white'><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Consolas;color:#333333'>&nbsp;&nbsp=
; Draft name :&nbsp; =
draft-cheng-spring-mpls-path-segment<o:p></o:p></span></pre><pre =
style=3D'margin-bottom:7.5pt;background:white'><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Consolas;color:#333333'>&nbsp;&nbsp=
; Speaker: Liang Geng, Mach Chen<o:p></o:p></span></pre><pre =
style=3D'margin-bottom:7.5pt;background:white'><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Consolas;color:#333333'>&nbsp;&nbsp=
; Duration: 10min<o:p></o:p></span></pre><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>Best Regards,</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>Weiqiang Cheng</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>Research Institute of China Mobile</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>Department of Network Technology</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>e-mail:chengweiqiang@chinamobile.com</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span lang=3DEN-US =
style=3D'font-family:"&#24494;&#36719;&#38597;&#40657;","sans-serif";colo=
r:black'>mobile: +86 138 1001 9089</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></body></html>
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