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Date: Thu, 22 Jan 2026 10:30:40 +0800 (CST)
From: Yisong Liu <liuyisong@chinamobile.com>
To: spring <spring@ietf.org>
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Hi WG,


Thank you for the valuable feedback shared on the mailing list. Based on th=
e community=E2=80=99s input, we have now updated the draft accordingly.


Specifically, we have added a dedicated subsection 4.4 to explicitly descri=
be the handling of multiple Segment Lists within a Candidate Path, includin=
g how SL exclusion impacts CP bandwidth and overall eligibility. We have al=
so enhanced section 4.5 to better explain how quality metrics such as bandw=
idth and latency are collected and applied during path selection, with the =
aim of mitigating the impact of quality metrics changes.


We truly appreciate your continued support and welcome further feedback fro=
m the community as we progress this work.


Best regards,Yisong



----=E9=82=AE=E4=BB=B6=E5=8E=9F=E6=96=87----=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=
=BC=9Ainternet-drafts <internet-drafts@ietf.org>=E6=94=B6=E4=BB=B6=E4=BA=BA=
=EF=BC=9A"Gyan S. Mishra" <gyan.s.mishra@verizon.com>,Changwang Lin <lincha=
ngwang.04414@h3c.com>,Gyan Mishra <gyan.s.mishra@verizon.com>,Ran Chen <che=
n.ran@zte.com.cn>,Shuping Peng <pengshuping@huawei.com>,Yisong Liu <liuyiso=
ng@chinamobile.com>,Yuanxiang Qiu <qiuyuanxiang@h3c.com>,Zafar Ali <zali@ci=
sco.com>=E6=8A=84=E3=80=80=E9=80=81: (=E6=97=A0)=E5=8F=91=E9=80=81=E6=97=B6=
=E9=97=B4=EF=BC=9A2026-01-22 09:31:49=E4=B8=BB=E9=A2=98=EF=BC=9ANew Version=
 Notification for draft-liu-spring-sr-policy-flexible-path-selection-13.txt=
A new version of Internet-Draftdraft-liu-spring-sr-policy-flexible-path-sel=
ection-13.txt has beensuccessfully submitted by Yisong Liu and posted to th=
eIETF repository.Name:     draft-liu-spring-sr-policy-flexible-path-selecti=
onRevision: 13Title:    Flexible Candidate Path Selection of SR PolicyDate:=
     2026-01-21Group:    Individual SubmissionPages:    20URL:      https:/=
/www.ietf.org/archive/id/draft-liu-spring-sr-policy-flexible-path-selection=
-13.txtStatus:   https://datatracker.ietf.org/doc/draft-liu-spring-sr-polic=
y-flexible-path-selection/HTMLized: https://datatracker.ietf.org/doc/html/d=
raft-liu-spring-sr-policy-flexible-path-selectionDiff:     https://author-t=
ools.ietf.org/iddiff?url2=3Ddraft-liu-spring-sr-policy-flexible-path-select=
ion-13Abstract:   This document describes a flexible method for selecting c=
andidate   Segment Routing (SR) policy paths. Based on the real-time resour=
ce   usage and forwarding quality of candidate paths, the head node can   p=
erform dynamic path switching among multiple candidate paths in the   SR po=
licy.The IETF SecretariatSubject=EF=BC=9ANew Version Notification for draft=
-liu-spring-sr-policy-flexible-path-selection-13.txtA new version of Intern=
et-Draftdraft-liu-spring-sr-policy-flexible-path-selection-13.txt has beens=
uccessfully submitted by Yisong Liu and posted to theIETF repository.Name: =
    draft-liu-spring-sr-policy-flexible-path-selectionRevision: 13Title:   =
 Flexible Candidate Path Selection of SR PolicyDate:     2026-01-21Group:  =
  Individual SubmissionPages:    20URL:      https://www.ietf.org/archive/i=
d/draft-liu-spring-sr-policy-flexible-path-selection-13.txtStatus:   https:=
//datatracker.ietf.org/doc/draft-liu-spring-sr-policy-flexible-path-selecti=
on/HTMLized: https://datatracker.ietf.org/doc/html/draft-liu-spring-sr-poli=
cy-flexible-path-selectionDiff:     https://author-tools.ietf.org/iddiff?ur=
l2=3Ddraft-liu-spring-sr-policy-flexible-path-selection-13Abstract:   This =
document describes a flexible method for selecting candidate   Segment Rout=
ing (SR) policy paths. Based on the real-time resource   usage and forwardi=
ng quality of candidate paths, the head node can   perform dynamic path swi=
tching among multiple candidate paths in the   SR policy.The IETF Secretari=
at


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<p class=3D"ds-markdown-paragraph" style=3D"margin-top: 16px; margin-bottom=
: 16px; color: rgb(15, 17, 21); font-family: quote-cjk-patch, Inter, system=
-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxyge=
n, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quot;, sa=
ns-serif; text-wrap-mode: wrap; background-color: rgb(255, 255, 255);">Hi W=
G,</p><p class=3D"ds-markdown-paragraph" style=3D"margin-top: 16px; margin-=
bottom: 16px; color: rgb(15, 17, 21); font-family: quote-cjk-patch, Inter, =
system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto,=
 Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quo=
t;, sans-serif; text-wrap-mode: wrap; background-color: rgb(255, 255, 255);=
">Thank you for the valuable feedback shared on the mailing list. Based on =
the community=E2=80=99s input, we have now updated the draft accordingly.</=
p><p class=3D"ds-markdown-paragraph" style=3D"margin-top: 16px; margin-bott=
om: 16px; color: rgb(15, 17, 21); font-family: quote-cjk-patch, Inter, syst=
em-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxy=
gen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quot;, =
sans-serif; text-wrap-mode: wrap; background-color: rgb(255, 255, 255);">Sp=
ecifically, we have added a dedicated subsection 4.4 to explicitly describe=
 the handling of multiple Segment Lists within a Candidate Path, including =
how SL exclusion impacts CP bandwidth and overall eligibility. We have also=
 enhanced section 4.5 to better explain how quality metrics such as bandwid=
th and latency are collected and applied during path selection, with the ai=
m of mitigating the impact of quality metrics changes.</p><p class=3D"ds-ma=
rkdown-paragraph" style=3D"margin-top: 16px; margin-bottom: 16px; color: rg=
b(15, 17, 21); font-family: quote-cjk-patch, Inter, system-ui, -apple-syste=
m, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen, Ubuntu, Cantar=
ell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quot;, sans-serif; text-wr=
ap-mode: wrap; background-color: rgb(255, 255, 255);">We truly appreciate y=
our continued support and welcome further feedback from the community as we=
 progress this work.</p><p class=3D"ds-markdown-paragraph" style=3D"margin-=
top: 16px; margin-bottom: 16px; color: rgb(15, 17, 21); font-family: quote-=
cjk-patch, Inter, system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe=
 UI&quot;, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;=
Helvetica Neue&quot;, sans-serif; text-wrap-mode: wrap; background-color: r=
gb(255, 255, 255);"><span style=3D"color: #0F1115; font-family: quote-cjk-p=
atch, Inter, system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&q=
uot;, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helve=
tica Neue&quot;, sans-serif; text-wrap-mode: wrap; background-color: #FFFFF=
F;">Best regards,</span><br style=3D"color: rgb(15, 17, 21); font-family: q=
uote-cjk-patch, Inter, system-ui, -apple-system, BlinkMacSystemFont, &quot;=
Segoe UI&quot;, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &=
quot;Helvetica Neue&quot;, sans-serif; text-wrap-mode: wrap; background-col=
or: rgb(255, 255, 255);"/>Yisong</p><p><br/></p><p>----=E9=82=AE=E4=BB=B6=
=E5=8E=9F=E6=96=87----<br/>=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9Ainternet-dra=
fts&nbsp;&lt;internet-drafts@ietf.org&gt;<br/>=E6=94=B6=E4=BB=B6=E4=BA=BA=
=EF=BC=9A&quot;Gyan&nbsp;S.&nbsp;Mishra&quot;&nbsp;&lt;gyan.s.mishra@verizo=
n.com&gt;,Changwang&nbsp;Lin&nbsp;&lt;linchangwang.04414@h3c.com&gt;,Gyan&n=
bsp;Mishra&nbsp;&lt;gyan.s.mishra@verizon.com&gt;,Ran&nbsp;Chen&nbsp;&lt;ch=
en.ran@zte.com.cn&gt;,Shuping&nbsp;Peng&nbsp;&lt;pengshuping@huawei.com&gt;=
,Yisong&nbsp;Liu&nbsp;&lt;liuyisong@chinamobile.com&gt;,Yuanxiang&nbsp;Qiu&=
nbsp;&lt;qiuyuanxiang@h3c.com&gt;,Zafar&nbsp;Ali&nbsp;&lt;zali@cisco.com&gt=
;<br/>=E6=8A=84=E3=80=80=E9=80=81:&nbsp;(=E6=97=A0)<br/>=E5=8F=91=E9=80=81=
=E6=97=B6=E9=97=B4=EF=BC=9A2026-01-22&nbsp;09:31:49<br/>=E4=B8=BB=E9=A2=98=
=EF=BC=9ANew&nbsp;Version&nbsp;Notification&nbsp;for&nbsp;draft-liu-spring-=
sr-policy-flexible-path-selection-13.txt<br/><br/>A&nbsp;new&nbsp;version&n=
bsp;of&nbsp;Internet-Draft<br/>draft-liu-spring-sr-policy-flexible-path-sel=
ection-13.txt&nbsp;has&nbsp;been<br/>successfully&nbsp;submitted&nbsp;by&nb=
sp;Yisong&nbsp;Liu&nbsp;and&nbsp;posted&nbsp;to&nbsp;the<br/>IETF&nbsp;repo=
sitory.<br/><br/>Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;draft-liu-spring-sr-pol=
icy-flexible-path-selection<br/>Revision:&nbsp;13<br/>Title:&nbsp;&nbsp;&nb=
sp;&nbsp;Flexible&nbsp;Candidate&nbsp;Path&nbsp;Selection&nbsp;of&nbsp;SR&n=
bsp;Policy<br/>Date:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2026-01-21<br/>Group:&nbs=
p;&nbsp;&nbsp;&nbsp;Individual&nbsp;Submission<br/>Pages:&nbsp;&nbsp;&nbsp;=
&nbsp;20<br/>URL:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;https://www.ietf.org/a=
rchive/id/draft-liu-spring-sr-policy-flexible-path-selection-13.txt<br/>Sta=
tus:&nbsp;&nbsp;&nbsp;https://datatracker.ietf.org/doc/draft-liu-spring-sr-=
policy-flexible-path-selection/<br/>HTMLized:&nbsp;https://datatracker.ietf=
.org/doc/html/draft-liu-spring-sr-policy-flexible-path-selection<br/>Diff:&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;https://author-tools.ietf.org/iddiff?url2=3Ddr=
aft-liu-spring-sr-policy-flexible-path-selection-13<br/><br/>Abstract:<br/>=
<br/>&nbsp;&nbsp;&nbsp;This&nbsp;document&nbsp;describes&nbsp;a&nbsp;flexib=
le&nbsp;method&nbsp;for&nbsp;selecting&nbsp;candidate<br/>&nbsp;&nbsp;&nbsp=
;Segment&nbsp;Routing&nbsp;(SR)&nbsp;policy&nbsp;paths.&nbsp;Based&nbsp;on&=
nbsp;the&nbsp;real-time&nbsp;resource<br/>&nbsp;&nbsp;&nbsp;usage&nbsp;and&=
nbsp;forwarding&nbsp;quality&nbsp;of&nbsp;candidate&nbsp;paths,&nbsp;the&nb=
sp;head&nbsp;node&nbsp;can<br/>&nbsp;&nbsp;&nbsp;perform&nbsp;dynamic&nbsp;=
path&nbsp;switching&nbsp;among&nbsp;multiple&nbsp;candidate&nbsp;paths&nbsp=
;in&nbsp;the<br/>&nbsp;&nbsp;&nbsp;SR&nbsp;policy.<br/><br/><br/><br/>The&n=
bsp;IETF&nbsp;Secretariat<br/><br/><br/><br/>Subject=EF=BC=9ANew&nbsp;Versi=
on&nbsp;Notification&nbsp;for&nbsp;draft-liu-spring-sr-policy-flexible-path=
-selection-13.txt<br/><br/>A&nbsp;new&nbsp;version&nbsp;of&nbsp;Internet-Dr=
aft<br/>draft-liu-spring-sr-policy-flexible-path-selection-13.txt&nbsp;has&=
nbsp;been<br/>successfully&nbsp;submitted&nbsp;by&nbsp;Yisong&nbsp;Liu&nbsp=
;and&nbsp;posted&nbsp;to&nbsp;the<br/>IETF&nbsp;repository.<br/><br/>Name:&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;draft-liu-spring-sr-policy-flexible-path-selec=
tion<br/>Revision:&nbsp;13<br/>Title:&nbsp;&nbsp;&nbsp;&nbsp;Flexible&nbsp;=
Candidate&nbsp;Path&nbsp;Selection&nbsp;of&nbsp;SR&nbsp;Policy<br/>Date:&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;2026-01-21<br/>Group:&nbsp;&nbsp;&nbsp;&nbsp;Ind=
ividual&nbsp;Submission<br/>Pages:&nbsp;&nbsp;&nbsp;&nbsp;20<br/>URL:&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;https://www.ietf.org/archive/id/draft-liu-spr=
ing-sr-policy-flexible-path-selection-13.txt<br/>Status:&nbsp;&nbsp;&nbsp;h=
ttps://datatracker.ietf.org/doc/draft-liu-spring-sr-policy-flexible-path-se=
lection/<br/>HTMLized:&nbsp;https://datatracker.ietf.org/doc/html/draft-liu=
-spring-sr-policy-flexible-path-selection<br/>Diff:&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;https://author-tools.ietf.org/iddiff?url2=3Ddraft-liu-spring-sr-polic=
y-flexible-path-selection-13<br/><br/>Abstract:<br/><br/>&nbsp;&nbsp;&nbsp;=
This&nbsp;document&nbsp;describes&nbsp;a&nbsp;flexible&nbsp;method&nbsp;for=
&nbsp;selecting&nbsp;candidate<br/>&nbsp;&nbsp;&nbsp;Segment&nbsp;Routing&n=
bsp;(SR)&nbsp;policy&nbsp;paths.&nbsp;Based&nbsp;on&nbsp;the&nbsp;real-time=
&nbsp;resource<br/>&nbsp;&nbsp;&nbsp;usage&nbsp;and&nbsp;forwarding&nbsp;qu=
ality&nbsp;of&nbsp;candidate&nbsp;paths,&nbsp;the&nbsp;head&nbsp;node&nbsp;=
can<br/>&nbsp;&nbsp;&nbsp;perform&nbsp;dynamic&nbsp;path&nbsp;switching&nbs=
p;among&nbsp;multiple&nbsp;candidate&nbsp;paths&nbsp;in&nbsp;the<br/>&nbsp;=
&nbsp;&nbsp;SR&nbsp;policy.<br/><br/><br/><br/>The&nbsp;IETF&nbsp;Secretari=
at<br/><br/><br/><br/></p>
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