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From: "Weiqiang Cheng" <chengweiqiang@chinamobile.com>
To: "'Rishabh Parekh'" <rishabhp@gmail.com>
Cc: <srcomp@ietf.org>, "'SPRING WG List'" <spring@ietf.org>
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Date: Tue, 2 Mar 2021 13:27:36 +0800
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Subject: Re: [spring] New drafts from SRCOMP design team
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Hi Rishabh,

Thanks for your comments.

It is good point, and DT will consider the it in.

=20

B.R.

Weiqiang Cheng

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: spring [mailto:spring-bounces@ietf.org] =
=E4=BB=A3=E8=A1=A8 Rishabh Parekh
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B42=E6=9C=8827=E6=97=A5 =
01:50
=E6=94=B6=E4=BB=B6=E4=BA=BA: Weiqiang Cheng
=E6=8A=84=E9=80=81: srcomp@ietf.org; SPRING WG List
=E4=B8=BB=E9=A2=98: Re: [spring] New drafts from SRCOMP design team

=20

Weiqiang,

Text quoted below from the SPRING charter indirectly covers =
Point-to-Multipoint requirement which is addressed by SR Replication =
Segment draft =
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication-segment=
/

New types of segments mapping to forwarding behaviour (e.g., local
ingress replication, local forwarding resources, a pre-existing
replication structure) if needed for new usages.

For the Point-to-Multipoint compression requirement, what exactly is =
"multicast address" in the Metric? Is this an IPv6 multicast address? If =
so, it really does not conform to SRv6 data plane.=20

=20

I would rather consider the SRv6 Replication SID, described in the =
latest version of SR Replication segment draft, to be the Metric for =
measuring P2MP requirement. Maybe we should also consider adding it to =
SRv6 Functionality Section 4.2.1 of the compression requirements draft.

=20

-Rishabh

=20

=20

On Thu, Feb 25, 2021 at 9:25 AM Weiqiang Cheng =
<chengweiqiang@chinamobile.com> wrote:

Hi All,

Two drafts have been submitted.  Please review them and any comments are =
welcomed.

=20

Compression requirement draft -04 version provided two more =
requirements:=20

https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-require=
ment-04.txt

=20

Compression analysis draft -00 provided a skeleton for the analysis of 4 =
candidate proposals.

https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-analysi=
s-00.txt

=20

B.R.

Weiqiang

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


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</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi Rishabh,<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks for your comments.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>It is good point, and DT will consider the it =
in.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>B.R.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Weiqiang Cheng<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> spring [mailto:spring-bounces@ietf.org] =
</span><b><span style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 =
</span></b><span lang=3DEN-US style=3D'font-size:10.0pt'>Rishabh =
Parekh<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2021</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>2</span>=E6=9C=88<span lang=3DEN-US>27</span>=E6=97=A5<span =
lang=3DEN-US> 01:50<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Weiqiang =
Cheng<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> srcomp@ietf.org; SPRING WG =
List<br></span><b>=E4=B8=BB=E9=A2=98<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Re: [spring] New drafts from SRCOMP design =
team<o:p></o:p></span></span></p></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Weiqiang,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Text quoted below from the SPRING =
charter indirectly covers Point-to-Multipoint requirement which is =
addressed by SR Replication Segment draft <a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication=
-segment/" =
target=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-spring-sr-r=
eplication-segment/</a><o:p></o:p></span></p></div><div><pre><span =
lang=3DEN-US>New types of segments mapping to forwarding behaviour =
(e.g., local<o:p></o:p></span></pre><pre><span lang=3DEN-US>ingress =
replication, local forwarding resources, a =
pre-existing<o:p></o:p></span></pre><pre><span lang=3DEN-US>replication =
structure) if needed for new =
usages.<o:p></o:p></span></pre></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>For the Point-to-Multipoint compression requirement, what =
exactly is &quot;multicast address&quot; in the Metric? Is this an IPv6 =
multicast address? If so, it really does not conform to SRv6 data plane. =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>I would rather consider the SRv6 =
Replication SID, described in the latest version of SR Replication =
segment draft, to be the Metric for measuring P2MP requirement. Maybe we =
should also consider adding it to SRv6 Functionality Section 4.2.1 of =
the compression requirements draft.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>-Rishabh<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#888888'><o:p>&nbsp;</o:p></span></p></div></div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>On Thu, Feb 25, 2021 at 9:25 AM =
Weiqiang Cheng &lt;<a =
href=3D"mailto:chengweiqiang@chinamobile.com">chengweiqiang@chinamobile.c=
om</a>&gt; wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Hi All,<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Two drafts have been submitted.&nbsp; Please review them =
and any comments are welcomed.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Compression requirement draft -04 version provided two more =
requirements: <o:p></o:p></span></p><p><span lang=3DEN-US><a =
href=3D"https://www.ietf.org/archive/id/draft-srcompdt-spring-compression=
-requirement-04.txt" =
target=3D"_blank">https://www.ietf.org/archive/id/draft-srcompdt-spring-c=
ompression-requirement-04.txt</a><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Compression analysis draft -00 provided a skeleton for the =
analysis of 4 candidate proposals.<o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US><a =
href=3D"https://www.ietf.org/archive/id/draft-srcompdt-spring-compression=
-analysis-00.txt" =
target=3D"_blank">https://www.ietf.org/archive/id/draft-srcompdt-spring-c=
ompression-analysis-00.txt</a><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>B.R.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Weiqiang<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span =
lang=3DEN-US>_______________________________________________<br>spring =
mailing list<br><a href=3D"mailto:spring@ietf.org" =
target=3D"_blank">spring@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/spring" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><o:p></=
o:p></span></p></blockquote></div></div></body></html>
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From: Ron Bonica <rbonica@juniper.net>
To: Weiqiang Cheng <chengweiqiang@chinamobile.com>, 'Rishabh Parekh' <rishabhp@gmail.com>
CC: "srcomp@ietf.org" <srcomp@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Srcomp] [spring] New drafts from SRCOMP design team
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/MKMxl9FM7B3mwAbudubDoiib-e0>
Subject: Re: [spring] [Srcomp]  New drafts from SRCOMP design team
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From: "Pengshuping (Peng Shuping)" <pengshuping@huawei.com>
To: "spring@ietf.org" <spring@ietf.org>
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Dear all,

The agenda has been posted. Please let us know if you want to make any chan=
ges.

https://datatracker.ietf.org/meeting/110/materials/agenda-110-spring-02.txt

Please upload your slides directly to https://datatracker.ietf.org/meeting/=
110/session/spring or send them to spring-chairs@ietf.org<mailto:spring-cha=
irs@ietf.org>.
Since we are the first session on Monday. So please upload your slides 24H =
or 48H before the section.

Thank you!

Best regards,
Shuping

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all, <o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The agenda has been posted. Ple=
ase let us know if you want to make any changes.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/meeting/110/materials/agenda-110-spring-02.txt">https://datatracke=
r.ietf.org/meeting/110/materials/agenda-110-spring-02.txt</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please upload your slides direc=
tly to <a href=3D"https://datatracker.ietf.org/meeting/110/session/spring">
https://datatracker.ietf.org/meeting/110/session/spring</a> or send them to=
 <a href=3D"mailto:spring-chairs@ietf.org">
spring-chairs@ietf.org</a>. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Since we are the first session =
on Monday. So please upload your slides 24H or 48H before the section.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thank you! <o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards, <o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Shuping <o:p></o:p></span></p>
</div>
</body>
</html>

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Subject: [spring] Special PALS/MPLS/DetNet/SPRING joint meeting on Friday of IETF week
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Looking at the IETF 110 agenda, you may have noticed a
PALS/MPLS/DetNet/SPRING joint session on Friday Session I (12:00-14:00 UTC)
in Room 7.

This meeting was organized as a result of three recent drafts that have
raised some basic architectural issues in proposing new applications and
uses at the bottom of the MPLS label stack. The MPLS WG owns the underlying
architecture, while PALS and DetNet both already make use of BoS, and one
of the drafts in question is proposing SR-MPLS iOAM that would also play in
that space (thus SPRING is part of this meeting as well).

We are not soliciting any further drafts or talks for this session. The
agenda is already full, and can be found at
https://datatracker.ietf.org/meeting/110/materials/agenda-110-pals-03 . The
agenda lists the drafts in question, and includes URLs for them. We are
also including ample time for open discussion following the presentations.

You are all invited to this session, which we hope will be a productive
contribution to continued
discussion on the topic.

Please let me know if you have any questions. I'll be the overall chair for
the session, with able co-chairing from a chair of each of the invited WGs.

Thanks,
Andy

--000000000000dd6e2105bca43434
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<div dir=3D"ltr">Looking at the IETF 110 agenda, you=C2=A0may have noticed =
a PALS/MPLS/DetNet/SPRING joint session on Friday Session I (12:00-14:00 UT=
C) in Room 7.<div><br></div><div>This meeting was organized as a result of =
three recent drafts that have raised some basic architectural issues in pro=
posing new applications and uses at the bottom of the MPLS label stack. The=
 MPLS WG owns the underlying architecture, while PALS and DetNet both alrea=
dy make use of BoS, and one of the drafts in question is proposing SR-MPLS =
iOAM that would also play in that space (thus SPRING is part of this meetin=
g as well).</div><div><br></div><div>We are not soliciting any further draf=
ts or talks for this session. The agenda is already full, and can be found =
at=C2=A0<a href=3D"https://datatracker.ietf.org/meeting/110/materials/agend=
a-110-pals-03">https://datatracker.ietf.org/meeting/110/materials/agenda-11=
0-pals-03</a> . The agenda lists the drafts in question, and includes URLs =
for them. We are also including ample time for open discussion following th=
e presentations.</div><div><br></div><div>You are all invited to this sessi=
on, which we hope will be a productive contribution to continued</div>discu=
ssion on the topic.<div><br></div><div>Please let me know if you have any q=
uestions. I&#39;ll be the overall chair for the session, with able co-chair=
ing from a chair of each of the invited WGs.</div><div><br></div><div>Thank=
s,</div><div>Andy</div><div><br></div></div>

--000000000000dd6e2105bca43434--


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To: "spring@ietf.org" <spring@ietf.org>
CC: "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
Thread-Topic: WG Last Call draft-ietf-spring-nsh-sr
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Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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Dear WG,

We received very few support and review so far: two reviews excluding the a=
uthors and including the shepherd.
Thanks Greg for the review.

To allow for more feedback, the WG last call is extended for two weeks unti=
l March 18.

In the meantime, authors are invited to reply to the comments sent on the l=
ist.

Thanks,
--Bruno

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Tuesday, February 9, 2021 7:31 PM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1].

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr

--Bruno


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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table List 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table 3D effects 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table 3D effects 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table 3D effects 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Contemporary"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Elegant"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Professional"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Subtle 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Subtle 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Web 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Web 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Web 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Balloon Text"/>
<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Table Theme"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder Te=
xt"/>
<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" Name=3D"No=
 Spacing"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" Name=3D"L=
ist Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" Name=3D"Q=
uote"/>
<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" Name=3D"I=
ntense Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 1=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 2=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 3=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
4"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
4"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 4=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
5"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
5"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 5=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
6"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 6=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true" Name=3D"S=
ubtle Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true" Name=3D"I=
ntense Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true" Name=3D"S=
ubtle Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true" Name=3D"I=
ntense Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" Name=3D"B=
ook Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true" Unhide=
WhenUsed=3D"true" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
WhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table 1"/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"43" Name=3D"Plain Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"44" Name=3D"Plain Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"45" Name=3D"Plain Table 5"/>
<w:LsdException Locked=3D"false" Priority=3D"40" Name=3D"Grid Table Light"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark"=
/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 3"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 3"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 4"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 4"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 5"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 5"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 5"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 Light=
 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 Accen=
t 6"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 Accen=
t 6"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 Accen=
t 6"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 Dark =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 Color=
ful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 Color=
ful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 Light=
"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 Dark"=
/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 Color=
ful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 Color=
ful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 Light=
 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4 Accen=
t 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 Dark =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 Color=
ful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 Color=
ful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 Light=
 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4 Accen=
t 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 Dark =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 Color=
ful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 Color=
ful Accent 2"/>
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<body lang=3D"FR" link=3D"#0563C1" vlink=3D"#954F72" style=3D"tab-interval:=
35.4pt">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span class=3D"SpellE"><span style=3D"mso-ascii-font=
-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calib=
ri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D">Dear</sp=
an></span><span style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-fam=
ily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times =
New Roman&quot;;color:#1F497D">
 WG,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-far=
east-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family=
:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">We received very few support and review
 so far: two reviews excluding the authors and including the shepherd.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">Thanks Greg for the review.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">To allow for more feedback, the WG last
 call is extended for two weeks until March 18.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">In the meantime, authors are invited to
 reply to the comments sent on the list.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><span class=3D"SpellE"><b><span style=3D"mso-fareast=
-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;mso-f=
areast-language:FR">From</span></b></span><b><span style=3D"mso-fareast-fon=
t-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;mso-farea=
st-language:FR">:</span></b><span style=3D"mso-fareast-font-family:&quot;Ti=
mes New Roman&quot;;mso-bidi-font-family:Calibri;mso-fareast-language:FR">
<span class=3D"SpellE">spring</span> [mailto:spring-bounces@ietf.org] <b>On=
 Behalf Of
</b>bruno.decraene@orange.com<br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Dear WG, <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr =
[1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">After review of the document please indicate whether you believe this do=
cument should be progressed to the IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">In addition to yes/no, please consider providing a technical review of t=
his document; in particular if you care for this document.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Indeed, since WG adoption, this document had benefited from little revie=
ws from the WG, so we need more review from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">If you are aware of an implementation of this document, please report th=
e implementation either on the list or to the chairs so that the shepherd c=
an report implementations in the writeup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Note that I&#8217;ll forward that call to the SFC WG.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Thanks!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">[1] <a href=3D"https://tools.ietf.org/html/draft-iet=
f-spring-nsh-sr">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">--Bruno<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>______________________________________________________________________=
___________________________________________________<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<o:p></o:p></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<o:p></o:p></pre>
<pre>a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>
<pre>they should not be distributed, used or copied without authorisation.<=
o:p></o:p></pre>
<pre>If you have received this email in error, please notify the sender and=
 delete this message and its attachments.<o:p></o:p></pre>
<pre>As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.<o:p></o:p></pre>
<pre>Thank you.<o:p></o:p></pre>
</div>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
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Thank you.
</PRE></body>
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From: Haoyu Song <haoyu.song@futurewei.com>
To: Yaakov Stein <yaakov_s@rad.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Date: Fri, 5 Mar 2021 20:45:45 +0000
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Subject: Re: [spring] new draft on segment routing approach to TSN
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Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org> On Behalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org; spring@ietf.org; pce@ietf.org
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://nam11.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Chaoyu.song%40futurewei.com%7C603ba064d1ef4220fa0508d8d7=
fd0e0b%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637496829160448349%7CUn=
known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ=
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&reserved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72" style=3D"word-wrap:=
break-word">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Just got a chance to read your draft. I agree with t=
he comments of the others that this is a very interesting work. I&#8217;ll =
just add a few points.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo4">The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work.
 Alternatively, one can simply budget a device latency which require a rout=
er/switch to obey. In case the overall budget is evenly divided by the hops=
, a single parameter is enough. Of course, if one wants to customize the bu=
dget on each hop (which might be
 necessary considering the different capability/capacity of each hop), a st=
ack is still needed.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso=
-list:l0 level1 lfo4">Mechanism should be provisioned to track where the ti=
ming requirement is violated and by how much (e.g., using timestamp or flag=
). This would be very useful for troubleshooting.<o:p></o:p></li><li class=
=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 lfo4">Rec=
ently programmable scheduler research has proposed several primitives such =
as PIPO and PIEO and provided feasible hardware implementations. The scheme=
 proposed in this draft can
 easily fit into these primitives.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> detnet@ietf.org; spring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
www.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7=
Chaoyu.song%40futurewei.com%7C603ba064d1ef4220fa0508d8d7fd0e0b%7C0fee8ff2a3=
b240189c753a1d5591fedc%7C1%7C1%7C637496829160448349%7CUnknown%7CTWFpbGZsb3d=
8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&=
amp;sdata=3DFq7J2ogbHh%2B26TZ2dRc82eUhJkwAOSWdnvR1G68r5p8%3D&amp;reserved=
=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l2 level1 =
lfo3">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l2 level1 lfo3">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l2 level1 lfo3">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_DM6PR13MB2762033C6ACECC4A816830AC9A969DM6PR13MB2762namp_--


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From: "Pengshuping (Peng Shuping)" <pengshuping@huawei.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "spring-chairs@ietf.org" <spring-chairs@ietf.org>
Thread-Topic: SPRING agenda is posted
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--_000_4278D47A901B3041A737953BAA078ADE199850C0dggeml512mbxchi_
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Hi all,

It seems that the system has some issues for you to directly upload your sl=
ides.

Please feel free to send them to spring-chairs@ietf.org<mailto:spring-chair=
s@ietf.org>.

Thank you!

Best regards,
Shuping


From: Pengshuping (Peng Shuping)
Sent: Wednesday, March 3, 2021 6:18 PM
To: 'spring@ietf.org' <spring@ietf.org>
Cc: 'spring-chairs@ietf.org' <spring-chairs@ietf.org>
Subject: SPRING agenda is posted

Dear all,

The agenda has been posted. Please let us know if you want to make any chan=
ges.

https://datatracker.ietf.org/meeting/110/materials/agenda-110-spring-02.txt

Please upload your slides directly to https://datatracker.ietf.org/meeting/=
110/session/spring or send them to spring-chairs@ietf.org<mailto:spring-cha=
irs@ietf.org>.
Since we are the first session on Monday. So please upload your slides 24H =
or 48H before the section.

Thank you!

Best regards,
Shuping

--_000_4278D47A901B3041A737953BAA078ADE199850C0dggeml512mbxchi_
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi all,=
 <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">It seem=
s that the system has some issues for you to directly upload your slides.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Please =
feel free to send them to
</span><span lang=3D"EN-US"><a href=3D"mailto:spring-chairs@ietf.org">sprin=
g-chairs@ietf.org</a></span><span lang=3D"EN-US" style=3D"color:#1F497D">.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou! <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Best re=
gards, <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Shuping=
 <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
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<div>
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0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:11.0pt">From:</span></b><span lang=3D"EN-US=
" style=3D"font-size:11.0pt"> Pengshuping (Peng Shuping)
<br>
<b>Sent:</b> Wednesday, March 3, 2021 6:18 PM<br>
<b>To:</b> 'spring@ietf.org' &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> 'spring-chairs@ietf.org' &lt;spring-chairs@ietf.org&gt;<br>
<b>Subject:</b> SPRING agenda is posted<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all, <o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The agenda has been posted. Ple=
ase let us know if you want to make any changes.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/meeting/110/materials/agenda-110-spring-02.txt">https://datatracke=
r.ietf.org/meeting/110/materials/agenda-110-spring-02.txt</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please upload your slides direc=
tly to <a href=3D"https://datatracker.ietf.org/meeting/110/session/spring">
https://datatracker.ietf.org/meeting/110/session/spring</a> or send them to=
 <a href=3D"mailto:spring-chairs@ietf.org">
spring-chairs@ietf.org</a>. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Since we are the first session =
on Monday. So please upload your slides 24H or 48H before the section.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thank you! <o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards, <o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Shuping <o:p></o:p></span></p>
</div>
</div>
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From: "Weiqiang Cheng" <chengweiqiang@chinamobile.com>
To: "'SPRING WG List'" <spring@ietf.org>
Cc: <srcomp@ietf.org>
Date: Sun, 7 Mar 2021 10:39:33 +0800
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Subject: [spring] FW: New Version Notification for draft-srcompdt-spring-compression-requirement-05.txt
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Hi Group and Chairs,
The SRCOMP design team has updated the requirements draft based on the =
progress over the past two weeks.=20
The links to the update are as follows:
https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-require=
ment-05.txt

All the requirements we have received till now have been included in =
this revision.=20
The design team has agreed on almost all of the requirements, only three =
of which with rough but not unanimous consensus was put in the appendix.

Please review it and much appreciate your comments, questions.

B.R.
Weiqiang Cheng on behalf of SRCOMP

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org =
[mailto:internet-drafts@ietf.org]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B43=E6=9C=887=E6=97=A5 =
10:14
=E6=94=B6=E4=BB=B6=E4=BA=BA: Cheng Li; Chongfeng Xie; Darren Dukes; Peng =
Shaofu; Ron Bonica; Shaofu Peng; Weiqiang Cheng; Wim Henderickx
=E4=B8=BB=E9=A2=98: New Version Notification for =
draft-srcompdt-spring-compression-requirement-05.txt


A new version of I-D, =
draft-srcompdt-spring-compression-requirement-05.txt
has been successfully submitted by Weiqiang Cheng and posted to the
IETF repository.

Name:		draft-srcompdt-spring-compression-requirement
Revision:	05
Title:		Compressed SRv6 SID List Requirements
Document date:	2021-03-05
Group:		Individual Submission
Pages:		17
URL:            =
https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-require=
ment-05.txt
Status:         =
https://datatracker.ietf.org/doc/draft-srcompdt-spring-compression-requir=
ement/
Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-r=
equirement
Htmlized:       =
https://tools.ietf.org/html/draft-srcompdt-spring-compression-requirement=
-05
Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-srcompdt-spring-compression-req=
uirement-05

Abstract:
   This document specifies requirements for solutions to compress SRv6
   SID lists.

                                                                         =
        =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.

The IETF Secretariat






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From: Yaakov Stein <yaakov_s@rad.com>
To: Haoyu Song <haoyu.song@futurewei.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/4C1cVYN5oiX7v8vUyoQD-E6L0hY>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.

> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com>; detnet@ietf.org; spring@ietf.org; pce@=
ietf.org
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
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erved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Haoyu, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;ll address your points:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; The use of clock time as deadline requires netw=
ork synchronization<o:p></o:p></p>
<p class=3D"MsoNormal">That is a basic assumption of TSN networks (IMO the =
defining assumption).<o:p></o:p></p>
<p class=3D"MsoNormal">However, the sync needn&#8217;t be highly accurate &=
#8211; it depends on the tightness of the delay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; accurate measurement of per-link propagation ti=
me<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I am assuming that once an for all someone does=
 a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measurement of the links, a=
nd these are stored in some database.<o:p></o:p></p>
<p class=3D"MsoNormal">Once again, the required accuracy depends on the del=
ay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; which can somehow limit the application scope o=
f this work<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget only above the physically minima=
l delay by say less than 100 microseconds,
<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that the previous two issues MUST be carried=
 out. But in such cases there is no alternative.<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget is much higher than that, then o=
ne could use an RSVP-like mechanism,<o:p></o:p></p>
<p class=3D"MsoNormal">sending a packet (or several packets) from source to=
 destination collecting a stack of timestamps,<o:p></o:p></p>
<p class=3D"MsoNormal">and then using that stack for the following packets.=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Mechanism should be provisioned to track where =
the timing requirement is violated and by how much<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll leave the OAM for later. However there ar=
e already many high accuracy performance measurement techniques and protoco=
ls for this.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Recently programmable scheduler research has pr=
oposed several primitives<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I tried to stress that this ID is not limited t=
o EDF (although sometimes that is a good strategy).<o:p></o:p></p>
<p class=3D"MsoNormal">One can even reproduce Qbv behavior using a stack of=
 deadlines (although why would one wish to do so?).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; such as PIPO and PIEO<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ve heard of PIFO (Push In First out) but not=
 PIPO. Is this a typo or something new?<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that there are mechanisms that are optimized=
 for hardware, but I have come up with a very nice hardware implementation =
for PEDF<o:p></o:p></p>
<p class=3D"MsoNormal">and prefer to find hardware implementations for opti=
mal schedulers, rather than to determine schedulers based on optimal hardwa=
re.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;haoyu.song@futurewei.com=
&gt; <br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; detnet@ietf.org; spring@i=
etf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt;word-wrap:break-word">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Just got a chance to read your draft. I agree with t=
he comments of the others that this is a very interesting work. I&#8217;ll =
just add a few points.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work.
 Alternatively, one can simply budget a device latency which require a rout=
er/switch to obey. In case the overall budget is evenly divided by the hops=
, a single parameter is enough. Of course, if one wants to customize the bu=
dget on each hop (which might be
 necessary considering the different capability/capacity of each hop), a st=
ack is still needed.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso=
-list:l0 level1 lfo3">Mechanism should be provisioned to track where the ti=
ming requirement is violated and by how much (e.g., using timestamp or flag=
). This would be very useful for troubleshooting.<o:p></o:p></li><li class=
=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Rec=
ently programmable scheduler research has proposed several primitives such =
as PIPO and PIEO and provided feasible hardware implementations. The scheme=
 proposed in this draft can
 easily fit into these primitives.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
www.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7=
Cyaakov_s%40rad.com%7C29e393d86da94a8c90b908d8e017a95d%7Cf9047108cc2c4e4897=
a343fad1b3bf9d%7C1%7C0%7C637505739530106136%7CUnknown%7CTWFpbGZsb3d8eyJWIjo=
iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdat=
a=3DIs%2F58aDPKY6V%2FBEVAF5getSEUvLgyDjInxJNT%2BmpnWM%3D&amp;reserved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l2 level1 =
lfo6">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l2 level1 lfo6">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l2 level1 lfo6">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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From: Haoyu Song <haoyu.song@futurewei.com>
To: Yaakov Stein <yaakov_s@rad.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Date: Mon, 8 Mar 2021 02:41:17 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/3lP9gZRpKlzH-gQDjg5zd47YbME>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com>; detnet@ietf.org; spring@ietf.org=
; pce@ietf.org
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://nam11.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Chaoyu.song%40futurewei.com%7C6aeaab604ad842c5ca0f08d8e1=
22721c%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637506885364131187%7CUn=
known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ=
XVCI6Mn0%3D%7C1000&sdata=3DZHZdFoS63OmpW1tEcp9BBksGzRGfs8IF9NpJnS%2FlXa8%3D=
&reserved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72" style=3D"word-wrap:=
break-word">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Some feedback inline. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt; <=
br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;haoyu.song@futurewei.com&gt;; detnet@ietf.org; sp=
ring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Haoyu, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;ll address your points:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; The use of clock time as deadline requires netw=
ork synchronization<o:p></o:p></p>
<p class=3D"MsoNormal">That is a basic assumption of TSN networks (IMO the =
defining assumption).<o:p></o:p></p>
<p class=3D"MsoNormal">However, the sync needn&#8217;t be highly accurate &=
#8211; it depends on the tightness of the delay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Yes, I understand it. What I mean is that t=
he method mentioned in the draft seems to be also applicable to other types=
 of networks. For example, we can envision some time-critical traffic in DC=
N or WAN. If a protocol would be developed,
 can it also serve the other networks? If so, it would be better. <o:p></o:=
p></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">&gt; accurate measurement of per-link propagation ti=
me<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I am assuming that once an for all someone does=
 a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measurement of the links, a=
nd these are stored in some database.<o:p></o:p></p>
<p class=3D"MsoNormal">Once again, the required accuracy depends on the del=
ay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; which can somehow limit the application scope o=
f this work<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget only above the physically minima=
l delay by say less than 100 microseconds,
<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that the previous two issues MUST be carried=
 out. But in such cases there is no alternative.<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget is much higher than that, then o=
ne could use an RSVP-like mechanism,<o:p></o:p></p>
<p class=3D"MsoNormal">sending a packet (or several packets) from source to=
 destination collecting a stack of timestamps,<o:p></o:p></p>
<p class=3D"MsoNormal">and then using that stack for the following packets.=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Mechanism should be provisioned to track where =
the timing requirement is violated and by how much<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll leave the OAM for later. However there ar=
e already many high accuracy performance measurement techniques and protoco=
ls for this.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; For this I mean something recorded in the s=
ame packet with the deadlines. If it misses the deadline, the receiver may =
need to know where it&#8217;s violated. Other independent methods are possi=
ble, but it&#8217;s better to consider if it can be
 integrated in the current proposal.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Recently programmable scheduler research has pr=
oposed several primitives<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I tried to stress that this ID is not limited t=
o EDF (although sometimes that is a good strategy).<o:p></o:p></p>
<p class=3D"MsoNormal">One can even reproduce Qbv behavior using a stack of=
 deadlines (although why would one wish to do so?).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; such as PIPO and PIEO<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ve heard of PIFO (Push In First out) but not=
 PIPO. Is this a typo or something new?<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that there are mechanisms that are optimized=
 for hardware, but I have come up with a very nice hardware implementation =
for PEDF<o:p></o:p></p>
<p class=3D"MsoNormal">and prefer to find hardware implementations for opti=
mal schedulers, rather than to determine schedulers based on optimal hardwa=
re.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Sorry that&#8217;s a typo. I mean PIFO (alt=
hough we do have a paper under review using the name PIPO). Yes I agree tho=
se are just abstract primitives. The actual implementation, if customized t=
o a particular algorithm, would be simpler.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.=
song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Just got a chance to read your draft. I agree with t=
he comments of the others that this is a very interesting work. I&#8217;ll =
just add a few points.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work.
 Alternatively, one can simply budget a device latency which require a rout=
er/switch to obey. In case the overall budget is evenly divided by the hops=
, a single parameter is enough. Of course, if one wants to customize the bu=
dget on each hop (which might be
 necessary considering the different capability/capacity of each hop), a st=
ack is still needed.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso=
-list:l0 level1 lfo3">Mechanism should be provisioned to track where the ti=
ming requirement is violated and by how much (e.g., using timestamp or flag=
). This would be very useful for troubleshooting.<o:p></o:p></li><li class=
=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Rec=
ently programmable scheduler research has proposed several primitives such =
as PIPO and PIEO and provided feasible hardware implementations. The scheme=
 proposed in this draft can
 easily fit into these primitives.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
www.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7=
Chaoyu.song%40futurewei.com%7C6aeaab604ad842c5ca0f08d8e122721c%7C0fee8ff2a3=
b240189c753a1d5591fedc%7C1%7C0%7C637506885364131187%7CUnknown%7CTWFpbGZsb3d=
8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&=
amp;sdata=3DZHZdFoS63OmpW1tEcp9BBksGzRGfs8IF9NpJnS%2FlXa8%3D&amp;reserved=
=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo6">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l1 level1 lfo6">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l1 level1 lfo6">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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From: Yaakov Stein <yaakov_s@rad.com>
To: Haoyu Song <haoyu.song@futurewei.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/xnnW1Hyb1WfUpLimpTKwwi3Dafc>
Subject: Re: [spring] new draft on segment routing approach to TSN
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--_000_AM0PR03MB35223AD654033E1DE5963A21E5939AM0PR03MB3522eurp_
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Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We'll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com>; detnet@ietf.org; spring@ietf.org; pce@=
ietf.org
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Cyaakov_s%40rad.com%7Ccf886b3eaea04f141b4308d8e1dba873%7=
Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637507680849467802%7CUnknown%7C=
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=
%3D%7C1000&sdata=3D6TSHluQTQh2IyoehtQcGCjqxtT2MlJtQycz%2FCHVno74%3D&reserve=
d=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I think we are in agreement.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I do not see the need for explicitly handling the ca=
se of a packet missing a LOCAL deadline,<o:p></o:p></p>
<p class=3D"MsoNormal">since the following switches will already handle thi=
s case optimally (and may still meet the overall budget).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Counting packets that miss their delay budget is ind=
eed important,
<o:p></o:p></p>
<p class=3D"MsoNormal">and a counter could be configured in the egress rout=
er for this.<o:p></o:p></p>
<p class=3D"MsoNormal">We&#8217;ll need to define this when we get to the p=
rotocol specification.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">It would be advantageous to put a threshold on the f=
ailure rate<o:p></o:p></p>
<p class=3D"MsoNormal">and feed this back to the path/stack optimizer.<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;haoyu.song@futurewei.com=
&gt; <br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; detnet@ietf.org; spring@i=
etf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Some feedback inline. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yaakov Stein &lt;<a href=3D"mailto:yaak=
ov_s@rad.com">yaakov_s@rad.com</a>&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Haoyu, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;ll address your points:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; The use of clock time as deadline requires netw=
ork synchronization<o:p></o:p></p>
<p class=3D"MsoNormal">That is a basic assumption of TSN networks (IMO the =
defining assumption).<o:p></o:p></p>
<p class=3D"MsoNormal">However, the sync needn&#8217;t be highly accurate &=
#8211; it depends on the tightness of the delay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Yes, I understand it. What I mean is that t=
he method mentioned in the draft seems to be also applicable to other types=
 of networks. For example, we can envision some time-critical traffic in DC=
N or WAN. If a protocol would be developed,
 can it also serve the other networks? If so, it would be better. <o:p></o:=
p></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">&gt; accurate measurement of per-link propagation ti=
me<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I am assuming that once an for all someone does=
 a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measurement of the links, a=
nd these are stored in some database.<o:p></o:p></p>
<p class=3D"MsoNormal">Once again, the required accuracy depends on the del=
ay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; which can somehow limit the application scope o=
f this work<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget only above the physically minima=
l delay by say less than 100 microseconds,
<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that the previous two issues MUST be carried=
 out. But in such cases there is no alternative.<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget is much higher than that, then o=
ne could use an RSVP-like mechanism,<o:p></o:p></p>
<p class=3D"MsoNormal">sending a packet (or several packets) from source to=
 destination collecting a stack of timestamps,<o:p></o:p></p>
<p class=3D"MsoNormal">and then using that stack for the following packets.=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Mechanism should be provisioned to track where =
the timing requirement is violated and by how much<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll leave the OAM for later. However there ar=
e already many high accuracy performance measurement techniques and protoco=
ls for this.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; For this I mean something recorded in the s=
ame packet with the deadlines. If it misses the deadline, the receiver may =
need to know where it&#8217;s violated. Other independent methods are possi=
ble, but it&#8217;s better to consider if it can be
 integrated in the current proposal.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; Recently programmable scheduler research has pr=
oposed several primitives<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I tried to stress that this ID is not limited t=
o EDF (although sometimes that is a good strategy).<o:p></o:p></p>
<p class=3D"MsoNormal">One can even reproduce Qbv behavior using a stack of=
 deadlines (although why would one wish to do so?).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; such as PIPO and PIEO<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ve heard of PIFO (Push In First out) but not=
 PIPO. Is this a typo or something new?<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that there are mechanisms that are optimized=
 for hardware, but I have come up with a very nice hardware implementation =
for PEDF<o:p></o:p></p>
<p class=3D"MsoNormal">and prefer to find hardware implementations for opti=
mal schedulers, rather than to determine schedulers based on optimal hardwa=
re.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Sorry that&#8217;s a typo. I mean PIFO (alt=
hough we do have a paper under review using the name PIPO). Yes I agree tho=
se are just abstract primitives. The actual implementation, if customized t=
o a particular algorithm, would be simpler.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.=
song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov,</span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Just got a chance to read your draft. I agree with t=
he comments of the others that this is a very interesting work. I&#8217;ll =
just add a few points.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3">The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work.
 Alternatively, one can simply budget a device latency which require a rout=
er/switch to obey. In case the overall budget is evenly divided by the hops=
, a single parameter is enough. Of course, if one wants to customize the bu=
dget on each hop (which might be
 necessary considering the different capability/capacity of each hop), a st=
ack is still needed.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso=
-list:l1 level1 lfo3">Mechanism should be provisioned to track where the ti=
ming requirement is violated and by how much (e.g., using timestamp or flag=
). This would be very useful for troubleshooting.<o:p></o:p></li><li class=
=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 lfo3">Rec=
ently programmable scheduler research has proposed several primitives such =
as PIPO and PIEO and provided feasible hardware implementations. The scheme=
 proposed in this draft can
 easily fit into these primitives.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
www.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7=
Cyaakov_s%40rad.com%7Ccf886b3eaea04f141b4308d8e1dba873%7Cf9047108cc2c4e4897=
a343fad1b3bf9d%7C1%7C0%7C637507680849467802%7CUnknown%7CTWFpbGZsb3d8eyJWIjo=
iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdat=
a=3D6TSHluQTQh2IyoehtQcGCjqxtT2MlJtQycz%2FCHVno74%3D&amp;reserved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l2 level1 =
lfo6">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l2 level1 lfo6">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l2 level1 lfo6">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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Subject: Re: [spring] new draft on segment routing approach to TSN
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Hi Yaakov,
Any view on these comments?
Thanks
Bala'zs

From: detnet <detnet-bounces@ietf.org> On Behalf Of Bal=E1zs Varga A
Sent: Friday, February 26, 2021 3:03 PM
To: Yaakov Stein <yaakov_s@rad.com>; detnet@ietf.org; spring@ietf.org; pce@=
ietf.org
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Hi Yaakov,

many thanks for this well-written and information-rich draft.
I have enjoyed to read it (and also the discussions on the lists). :--)))


Conceptual (clarification) questions:
1, What is the node behavior if deadtime expires? Drop? That requires a qui=
te good design/allocation of the latency budget. Otherwise it may result in=
 unnecessary loss of a packet being relative late at a hop, however that mi=
ght be compensated by the remaining hops. (E.g., see your Figure 2, getting=
 35 microsecond at R1 instead of the designed 25, but R2,R3,R4 adds only 10=
-10-10 extra microseconds). You may consider to add a "late flag" to the pa=
cket instead of a drop ...

2, Do I understand it correctly that the described solution is practically =
a new per-hop-behavior? Does it have no tools to "influence" the arrival ti=
me at the next hops? In end-to-end latency design the DetNet/TSN functions =
are often used to "adapt" the arrival of packets belonging to a DetNet flow=
/TSN stream at given network points. If "latency design" requires such a "t=
ime shift" then the described method has to be combined with other DetNet/T=
SN tools.

3, Design of a guaranteed upper bound usually requires deterministic arriva=
l at each node along the path. In this solution the flow becomes less-an-le=
ss deterministic as it reaches the destination. I mean e.g., as per Figure =
2, arrival time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-1=
20 usec and at R4 is 92-167 usec. So, the flow is getting less-and-less det=
erministic at each hop. That can make deterministic design of other flows p=
assing R4 more difficult or even impossible in some scenarios. Have I misse=
d something here?

4, Wire-speed timestamping and calculation: I would be interested in your v=
iew regarding how realistic are (1) the wire speed timestamping capability =
and (2) adding multiple calculated deadline to packets. Both are required f=
or this solution. DetNet flows can have high bandwidth, not like 1588 packe=
ts.


Specific comments (Section 2-3):
5, Time gated Queuing [802.1Qbv] allows multiple gates to be open simultane=
ously. Furthermore preemption [802.1Qbu] can be combined with Qbv. So I can=
not fully agree with your evaluation of time-aware scheduling. (Section 2, =
"However, time-aware scheduling suffers from two major disadvantages.") Of =
course with a bad design one may shoot in his/her own leg, but in well-desi=
gned scenarios efficiency loss can be eliminated without expensive computat=
ion.

6, Deadtime calculation is also complex if impact of other DetNet flows mus=
t be considered. The pre-calculation of individual "local" deadlines may ne=
ed to be re-calculated when flows added to the network and they are using s=
ome common links. So I cannot agree with your statement. (Section 3, "... S=
ince the ingress router inserts the deadline stack into the packet headers,=
 no other router needs to be aware of the requirements of the time sensitiv=
e flows.  Hence admitting a new flow only requires updating the information=
 base of the ingress router."). Adding a flow may result in updating many i=
ngress routers' configuration.


Some topics for further discussions/considerations:
7, Impact of some DetNet functions (e.g., PREOF [RFC8655]) needs further di=
scussions. The usage of replication/elimination impacts the deadline calcul=
ation. Disjoint paths used by member flows requires different label stack a=
nd deadlines. Furthermore, these path specific labels+deadlines must be add=
ed by the replication node (PRF). So at least, a combination of PRF with B-=
SID and computing/adding deadlines (ingress SRTSN function) seems to be nec=
essary in your solution.

8, The ever-green topic ( and not the green-wave :--))) ): label stack size=
. You need multiple labels per hop and the label stack contains them for ea=
ch hop. Could result in a quite big label stack to be pushed at the ingress=
 (nx10s of labels).


I am happy to have further discussions on this interesting idea

Thanks & Cheers
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 2:14 PM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [Detnet] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">Any view on these comments?<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;detnet-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>Bal=E1zs Varga A<br>
<b>Sent:</b> Friday, February 26, 2021 3:03 PM<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; detnet@ietf.org; spring@i=
etf.org; pce@ietf.org<br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">many thanks for this well-written and information-ri=
ch draft.<o:p></o:p></p>
<p class=3D"MsoNormal">I have enjoyed to read it (and also the discussions =
on the lists). :--)))<o:p></o:p></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"><b>Conceptual (clarification) questions:<o:p></o:p><=
/b></p>
<p class=3D"MsoNormal">1, What is the node behavior if deadtime expires? Dr=
op? That requires a quite good design/allocation of the latency budget. Oth=
erwise it may result in unnecessary loss of a packet being relative late at=
 a hop, however that might be compensated
 by the remaining hops. (E.g., see your Figure 2, getting 35 microsecond at=
 R1 instead of the designed 25, but R2,R3,R4 adds only 10-10-10 extra micro=
seconds). You may consider to add a &quot;late flag&quot; to the packet ins=
tead of a drop ...<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">2, Do I understand it correctly that the described s=
olution is practically a new per-hop-behavior? Does it have no tools to &qu=
ot;influence&quot; the arrival time at the next hops? In end-to-end latency=
 design the DetNet/TSN functions are often used
 to &quot;adapt&quot; the arrival of packets belonging to a DetNet flow/TSN=
 stream at given network points. If &quot;latency design&quot; requires suc=
h a &quot;time shift&quot; then the described method has to be combined wit=
h other DetNet/TSN tools.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">3, Design of a guaranteed upper bound usually requir=
es deterministic arrival at each node along the path. In this solution the =
flow becomes less-an-less deterministic as it reaches the destination. I me=
an e.g., as per Figure 2, arrival
 time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-120 usec an=
d at R4 is 92-167 usec. So, the flow is getting less-and-less deterministic=
 at each hop. That can make deterministic design of other flows passing R4 =
more difficult or even impossible
 in some scenarios. Have I missed something here?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">4, Wire-speed timestamping and calculation: I would =
be interested in your view regarding how realistic are (1) the wire speed t=
imestamping capability and (2) adding multiple calculated deadline to packe=
ts. Both are required for this solution.
 DetNet flows can have high bandwidth, not like 1588 packets.<o:p></o:p></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"><b>Specific comments (Section 2-3):<o:p></o:p></b></=
p>
<p class=3D"MsoNormal">5, Time gated Queuing [802.1Qbv] allows multiple gat=
es to be open simultaneously. Furthermore preemption [802.1Qbu] can be comb=
ined with Qbv. So I cannot fully agree with your evaluation of time-aware s=
cheduling. (Section 2, &quot;However, time-aware
 scheduling suffers from two major disadvantages.&quot;) Of course with a b=
ad design one may shoot in his/her own leg, but in well-designed scenarios =
efficiency loss can be eliminated without expensive computation.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">6, Deadtime calculation is also complex if impact of=
 other DetNet flows must be considered. The pre-calculation of individual &=
quot;local&quot; deadlines may need to be re-calculated when flows added to=
 the network and they are using some common
 links. So I cannot agree with your statement. (Section 3, &quot;... Since =
the ingress router inserts the deadline stack into the packet headers, no o=
ther router needs to be aware of the requirements of the time sensitive flo=
ws.&nbsp; Hence admitting a new flow only
 requires updating the information base of the ingress router.&quot;). Addi=
ng a flow may result in updating many ingress routers' configuration.<o:p><=
/o:p></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"><b>Some topics for further discussions/consideration=
s:<o:p></o:p></b></p>
<p class=3D"MsoNormal">7, Impact of some DetNet functions (e.g., PREOF [RFC=
8655]) needs further discussions. The usage of replication/elimination impa=
cts the deadline calculation. Disjoint paths used by member flows requires =
different label stack and deadlines.
 Furthermore, these path specific labels+deadlines must be added by the rep=
lication node (PRF). So at least, a combination of PRF with B-SID and compu=
ting/adding deadlines (ingress SRTSN function) seems to be necessary in you=
r solution.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">8, The ever-green topic ( and not the green-wave :--=
))) ): label stack size. You need multiple labels per hop and the label sta=
ck contains them for each hop. Could result in a quite big label stack to b=
e pushed at the ingress (nx10s of
 labels).<o:p></o:p></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">I am happy to have further discussions on this inter=
esting idea<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks &amp; Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Bala'zs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 2:14 PM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [Detnet] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l0 level1 lfo3">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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To: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/SOAaGEGSVHn_mm-VN9L9eJL1t0k>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Bala'zs,

Sorry that I never got back to you on this.
It is much easier to shoot back replies to shorter emails :)

> 1, What is the node behavior if deadtime expires?
Nothing special is done if a local deadline is exceeded. There is still hop=
e that the time can be made up.
If too many packets fail to conform to their overall budget,
then maybe something has changed and reoptimization (or realizing that the =
application budget is not feasible) is required.

> 2, Do I understand it correctly that the described solution is practicall=
y a new per-hop-behavior?
Well, new to here but hardly "new" (similar things were done in ATM...)
The new per-router behavior requires a new data structure in the router ins=
tead of a FIFO queue,
but there is no absolute requirement for other tools.
As I just hinted and have mentioned in a previous email, later on we may ne=
ed some OAM to see if configuration needs to be updated.
I have already experimented with periodic RSVP-like synthetic packets that =
collect timestamps along the path.

> 3, Design of a guaranteed upper bound usually requires deterministic arri=
val at each node along the path.
Here is where we differ (or at least put different emphasis on the word "us=
ually".

Determinism is not the main goal of this draft. Meeting challenging delay b=
udgets is.
Sometimes absolute determinacy is required (e.g., in some forms of "telepro=
tection" in some electricity distribution networks)
in which case either TDM/Qbv/calendaring can be used, or this method couple=
d with a differential delay compensation buffer.

I agree that PDV increases from hop to hop to an extent, but when the delay=
 budget is really challenging you simply can't allow that many hops.
In mixed 5G xHaul cases in which I have been involved there are no more tha=
n 4 hops (usually fewer).

If you wish something more deterministic then look at the Andrews-Zhang str=
ategy.
They gate at the ingress router and EDF at all the following ones.
They show that (statistically) they ride "green waves" and thus the PDV doe=
sn't increase significantly
(see their graphs). This comes at the expense of a long cycle time for the =
initial gate, which means the budget can't be too tight.

> 4, Wire-speed timestamping and calculation
I come from the PTP world where hardware timestamping with submicro resolut=
ion is common.
Since the timestamp is on the rising edge of the first bit, i.e., before th=
e classifier,
it is carried out and placed in the packet metadata for every packet whethe=
r or not it is PTP.
I always shed tears over throwing out this information.
The RSVP-like method just mentioned simply copies it into the packet.
The SRTSN packets use this information in the scheduler.
I have consulted my ASIC people about the use of priority heaps and insert-=
queues
and they ensure me that they can put something like that into our 100G chip=
.

> 5, Time gated Queuing [802.1Qbv]
I didn't say that in principle you can't build a Qbv system that does great=
 things.
It is flexible enough to do anything you want.
The problem is the scalability.
I have played around with optimizing it and haven't found a good "on line" =
algorithm,
that is, a way of adding a new flow to an existing optimized design.
And even in the "off line" case (clean slate with all flows known) slight c=
hanges and even bad clocks in the user equipment ruins things.

But the main idea of this draft is that even given a good on-line algorithm=
 for Qbv
you would need to distribute the changes in the all the schedules to all th=
e routers.
What happens in the meantime? What happens when one router is already updat=
ed but another isn't?
With the stack method only a single ingress router needs to be updated and =
consistency is ensured!

> 6, Deadtime calculation is also complex if impact of other DetNet flows m=
ust be considered.
Of course! The offset vector needs to be optimized.
I have several such methods and am running simulations of various strategie=
s.
As stated in the ID the specific calculation was for illustration purposes =
-
the stack mechanism is much more generic.

> 7, Impact of some DetNet functions
I have not yet gotten to the point where I have considered this.

>  8, The ever-green topic ( and not the green-wave :--))) ): label stack s=
ize.
Yes, I didn't want to bring this up yet, but have been forced to.
I have to admit that I am not a fan of SRv6 for just this reason.
But, the SRTSN stack can be really small!
SR stack entries need only be ceil ( log2 (number of routers) ) in size (re=
quires a little local information base in the router)
assuming once the stack is popped you use the original DA. If you are not w=
illing to use this additional information
you still only need sufficient suffixes, which is still small.
The deadline entries can be miniscule since the wraparound constraint is de=
rived from the maximum flight time of a packet in the network.
In my designs I have gotten away with 16-32 bits per entry, which means 4-8=
 hop stacks only require the room of a single IPv6 address.

Hope this answers your questions and kicks off a fruitful discussion.

Y(J)S

From: Bal=E1zs Varga A <balazs.a.varga@ericsson.com>
Sent: 08/03/2021 08:35
To: Yaakov Stein <yaakov_s@rad.com>; detnet@ietf.org; spring@ietf.org; pce@=
ietf.org
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,
Any view on these comments?
Thanks
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Bal=E1zs Varga A
Sent: Friday, February 26, 2021 3:03 PM
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Hi Yaakov,

many thanks for this well-written and information-rich draft.
I have enjoyed to read it (and also the discussions on the lists). :--)))


Conceptual (clarification) questions:
1, What is the node behavior if deadtime expires? Drop? That requires a qui=
te good design/allocation of the latency budget. Otherwise it may result in=
 unnecessary loss of a packet being relative late at a hop, however that mi=
ght be compensated by the remaining hops. (E.g., see your Figure 2, getting=
 35 microsecond at R1 instead of the designed 25, but R2,R3,R4 adds only 10=
-10-10 extra microseconds). You may consider to add a "late flag" to the pa=
cket instead of a drop ...

2, Do I understand it correctly that the described solution is practically =
a new per-hop-behavior? Does it have no tools to "influence" the arrival ti=
me at the next hops? In end-to-end latency design the DetNet/TSN functions =
are often used to "adapt" the arrival of packets belonging to a DetNet flow=
/TSN stream at given network points. If "latency design" requires such a "t=
ime shift" then the described method has to be combined with other DetNet/T=
SN tools.

3, Design of a guaranteed upper bound usually requires deterministic arriva=
l at each node along the path. In this solution the flow becomes less-an-le=
ss deterministic as it reaches the destination. I mean e.g., as per Figure =
2, arrival time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-1=
20 usec and at R4 is 92-167 usec. So, the flow is getting less-and-less det=
erministic at each hop. That can make deterministic design of other flows p=
assing R4 more difficult or even impossible in some scenarios. Have I misse=
d something here?

4, Wire-speed timestamping and calculation: I would be interested in your v=
iew regarding how realistic are (1) the wire speed timestamping capability =
and (2) adding multiple calculated deadline to packets. Both are required f=
or this solution. DetNet flows can have high bandwidth, not like 1588 packe=
ts.


Specific comments (Section 2-3):
5, Time gated Queuing [802.1Qbv] allows multiple gates to be open simultane=
ously. Furthermore preemption [802.1Qbu] can be combined with Qbv. So I can=
not fully agree with your evaluation of time-aware scheduling. (Section 2, =
"However, time-aware scheduling suffers from two major disadvantages.") Of =
course with a bad design one may shoot in his/her own leg, but in well-desi=
gned scenarios efficiency loss can be eliminated without expensive computat=
ion.

6, Deadtime calculation is also complex if impact of other DetNet flows mus=
t be considered. The pre-calculation of individual "local" deadlines may ne=
ed to be re-calculated when flows added to the network and they are using s=
ome common links. So I cannot agree with your statement. (Section 3, "... S=
ince the ingress router inserts the deadline stack into the packet headers,=
 no other router needs to be aware of the requirements of the time sensitiv=
e flows.  Hence admitting a new flow only requires updating the information=
 base of the ingress router."). Adding a flow may result in updating many i=
ngress routers' configuration.


Some topics for further discussions/considerations:
7, Impact of some DetNet functions (e.g., PREOF [RFC8655]) needs further di=
scussions. The usage of replication/elimination impacts the deadline calcul=
ation. Disjoint paths used by member flows requires different label stack a=
nd deadlines. Furthermore, these path specific labels+deadlines must be add=
ed by the replication node (PRF). So at least, a combination of PRF with B-=
SID and computing/adding deadlines (ingress SRTSN function) seems to be nec=
essary in your solution.

8, The ever-green topic ( and not the green-wave :--))) ): label stack size=
. You need multiple labels per hop and the label stack contains them for ea=
ch hop. Could result in a quite big label stack to be pushed at the ingress=
 (nx10s of labels).


I am happy to have further discussions on this interesting idea

Thanks & Cheers
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 2:14 PM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [Detnet] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Cyaakov_s%40rad.com%7C270d392bafcf4742c92d08d8e1fc5c56%7=
Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637507821310056080%7CUnknown%7C=
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=
%3D%7C1000&sdata=3Do332wbi4u5fb%2BKtUW1CsB3jz9OEd32h%2BazNaEDnDHJY%3D&reser=
ved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bala'zs,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry that I never got back to you on this. <o:p></o=
:p></p>
<p class=3D"MsoNormal">It is much easier to shoot back replies to shorter e=
mails :)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 1, What is the node behavior if deadtime expire=
s?<o:p></o:p></p>
<p class=3D"MsoNormal">Nothing special is done if a local deadline is excee=
ded. There is still hope that the time can be made up.<o:p></o:p></p>
<p class=3D"MsoNormal">If too many packets fail to conform to their overall=
 budget,
<o:p></o:p></p>
<p class=3D"MsoNormal">then maybe something has changed and reoptimization =
(or realizing that the application budget is not feasible) is required.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 2, Do I understand it correctly that the descri=
bed solution is practically a new per-hop-behavior?<o:p></o:p></p>
<p class=3D"MsoNormal">Well, new to here but hardly &#8220;new&#8221; (simi=
lar things were done in ATM&#8230;)<o:p></o:p></p>
<p class=3D"MsoNormal">The new per-router behavior requires a new data stru=
cture in the router instead of a FIFO queue,<o:p></o:p></p>
<p class=3D"MsoNormal">but there is no absolute requirement for other tools=
.<o:p></o:p></p>
<p class=3D"MsoNormal">As I just hinted and have mentioned in a previous em=
ail, later on we may need some OAM to see if configuration needs to be upda=
ted.<o:p></o:p></p>
<p class=3D"MsoNormal">I have already experimented with periodic RSVP-like =
synthetic packets that collect timestamps along the path.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 3, Design of a guaranteed upper bound usually r=
equires deterministic arrival at each node along the path.<o:p></o:p></p>
<p class=3D"MsoNormal">Here is where we differ (or at least put different e=
mphasis on the word &#8220;usually&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Determinism is not the main goal of this draft. Meet=
ing challenging delay budgets is.<o:p></o:p></p>
<p class=3D"MsoNormal">Sometimes absolute determinacy is required (e.g., in=
 some forms of &#8220;teleprotection&#8221; in some electricity distributio=
n networks)<o:p></o:p></p>
<p class=3D"MsoNormal">in which case either TDM/Qbv/calendaring can be used=
, or this method coupled with a differential delay compensation buffer.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I agree that PDV increases from hop to hop to an ext=
ent, but when the delay budget is really challenging you simply can&#8217;t=
 allow that many hops.<o:p></o:p></p>
<p class=3D"MsoNormal">In mixed 5G xHaul cases in which I have been involve=
d there are no more than 4 hops (usually fewer).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you wish something more deterministic then look a=
t the Andrews-Zhang strategy.<o:p></o:p></p>
<p class=3D"MsoNormal">They gate at the ingress router and EDF at all the f=
ollowing ones.<o:p></o:p></p>
<p class=3D"MsoNormal">They show that (statistically) they ride &#8220;gree=
n waves&#8221; and thus the PDV doesn&#8217;t increase significantly<o:p></=
o:p></p>
<p class=3D"MsoNormal">(see their graphs). This comes at the expense of a l=
ong cycle time for the initial gate, which means the budget can&#8217;t be =
too tight.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 4, Wire-speed timestamping and calculation<o:p>=
</o:p></p>
<p class=3D"MsoNormal">I come from the PTP world where hardware timestampin=
g with submicro resolution is common.<o:p></o:p></p>
<p class=3D"MsoNormal">Since the timestamp is on the rising edge of the fir=
st bit, i.e., before the classifier,<o:p></o:p></p>
<p class=3D"MsoNormal">it is carried out and placed in the packet metadata =
for every packet whether or not it is PTP.<o:p></o:p></p>
<p class=3D"MsoNormal">I always shed tears over throwing out this informati=
on. <o:p>
</o:p></p>
<p class=3D"MsoNormal">The RSVP-like method just mentioned simply copies it=
 into the packet.<o:p></o:p></p>
<p class=3D"MsoNormal">The SRTSN packets use this information in the schedu=
ler.<o:p></o:p></p>
<p class=3D"MsoNormal">I have consulted my ASIC people about the use of pri=
ority heaps and insert-queues<o:p></o:p></p>
<p class=3D"MsoNormal">and they ensure me that they can put something like =
that into our 100G chip.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 5, Time gated Queuing [802.1Qbv]<o:p></o:p></p>
<p class=3D"MsoNormal">I didn&#8217;t say that in principle you can&#8217;t=
 build a Qbv system that does great things.<o:p></o:p></p>
<p class=3D"MsoNormal">It is flexible enough to do anything you want.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">The problem is the scalability. <o:p></o:p></p>
<p class=3D"MsoNormal">I have played around with optimizing it and haven&#8=
217;t found a good &#8220;on line&#8221; algorithm,
<o:p></o:p></p>
<p class=3D"MsoNormal">that is, a way of adding a new flow to an existing o=
ptimized design.<o:p></o:p></p>
<p class=3D"MsoNormal">And even in the &#8220;off line&#8221; case (clean s=
late with all flows known) slight changes and even bad clocks in the user e=
quipment ruins things.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">But the main idea of this draft is that even given a=
 good on-line algorithm for Qbv<o:p></o:p></p>
<p class=3D"MsoNormal">you would need to distribute the changes in the all =
the schedules to all the routers.<o:p></o:p></p>
<p class=3D"MsoNormal">What happens in the meantime? What happens when one =
router is already updated but another isn&#8217;t?<o:p></o:p></p>
<p class=3D"MsoNormal">With the stack method only a single ingress router n=
eeds to be updated and consistency is ensured!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 6, Deadtime calculation is also complex if impa=
ct of other DetNet flows must be considered.<o:p></o:p></p>
<p class=3D"MsoNormal">Of course! The offset vector needs to be optimized.<=
o:p></o:p></p>
<p class=3D"MsoNormal">I have several such methods and am running simulatio=
ns of various strategies.<o:p></o:p></p>
<p class=3D"MsoNormal">As stated in the ID the specific calculation was for=
 illustration purposes &#8211;
<o:p></o:p></p>
<p class=3D"MsoNormal">the stack mechanism is much more generic.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 7, Impact of some DetNet functions<o:p></o:p></=
p>
<p class=3D"MsoNormal">I have not yet gotten to the point where I have cons=
idered this.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; &nbsp;8, The ever-green topic ( and not the gre=
en-wave :--))) ): label stack size.<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I didn&#8217;t want to bring this up yet, but h=
ave been forced to.<o:p></o:p></p>
<p class=3D"MsoNormal">I have to admit that I am not a fan of SRv6 for just=
 this reason.<o:p></o:p></p>
<p class=3D"MsoNormal">But, the SRTSN stack can be really small!<o:p></o:p>=
</p>
<p class=3D"MsoNormal">SR stack entries need only be ceil ( log2 (number of=
 routers) ) in size (requires a little local information base in the router=
)<o:p></o:p></p>
<p class=3D"MsoNormal">assuming once the stack is popped you use the origin=
al DA. If you are not willing to use this additional information
<o:p></o:p></p>
<p class=3D"MsoNormal">you still only need sufficient suffixes, which is st=
ill small.<o:p></o:p></p>
<p class=3D"MsoNormal">The deadline entries can be miniscule since the wrap=
around constraint is derived from the maximum flight time of a packet in th=
e network.<o:p></o:p></p>
<p class=3D"MsoNormal">In my designs I have gotten away with 16-32 bits per=
 entry, which means 4-8 hop stacks only require the room of a single IPv6 a=
ddress.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hope this answers your questions and kicks off a fru=
itful discussion.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Bal=E1zs Varga A &lt;balazs.a.varga@eri=
csson.com&gt; <br>
<b>Sent:</b> 08/03/2021 08:35<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; detnet@ietf.org; spring@i=
etf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt;word-wrap:break-word">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov</span>,<o:p></=
o:p></p>
<p class=3D"MsoNormal">Any view on these comments?<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Bal=E1zs Varga A<br>
<b>Sent:</b> Friday, February 26, 2021 3:03 PM<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">many thanks for this well-written and information-ri=
ch draft.<o:p></o:p></p>
<p class=3D"MsoNormal">I have enjoyed to read it (and also the discussions =
on the lists). :--)))<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Conceptual (clarification) questions:</b><o:p></o=
:p></p>
<p class=3D"MsoNormal">1, What is the node behavior if deadtime expires? Dr=
op? That requires a quite good design/allocation of the latency budget. Oth=
erwise it may result in unnecessary loss of a packet being relative late at=
 a hop, however that might be compensated
 by the remaining hops. (E.g., see your Figure 2, getting 35 microsecond at=
 R1 instead of the designed 25, but R2,R3,R4 adds only 10-10-10 extra micro=
seconds). You may consider to add a &quot;late flag&quot; to the packet ins=
tead of a drop ...<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">2, Do I understand it correctly that the described s=
olution is practically a new per-hop-behavior? Does it have no tools to &qu=
ot;influence&quot; the arrival time at the next hops? In end-to-end latency=
 design the DetNet/TSN functions are often used
 to &quot;adapt&quot; the arrival of packets belonging to a DetNet flow/TSN=
 stream at given network points. If &quot;latency design&quot; requires suc=
h a &quot;time shift&quot; then the described method has to be combined wit=
h other DetNet/TSN tools.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">3, Design of a guaranteed upper bound usually requir=
es deterministic arrival at each node along the path. In this solution the =
flow becomes less-an-less deterministic as it reaches the destination. I me=
an e.g., as per Figure 2, arrival
 time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-120 usec an=
d at R4 is 92-167 usec. So, the flow is getting less-and-less deterministic=
 at each hop. That can make deterministic design of other flows passing R4 =
more difficult or even impossible
 in some scenarios. Have I missed something here?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">4, Wire-speed timestamping and calculation: I would =
be interested in your view regarding how realistic are (1) the wire speed t=
imestamping capability and (2) adding multiple calculated deadline to packe=
ts. Both are required for this solution.
 DetNet flows can have high bandwidth, not like 1588 packets.<o:p></o:p></p=
>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Specific comments (Section 2-3):</b><o:p></o:p></=
p>
<p class=3D"MsoNormal">5, Time gated Queuing [802.1Qbv] allows multiple gat=
es to be open simultaneously. Furthermore preemption [802.1Qbu] can be comb=
ined with Qbv. So I cannot fully agree with your evaluation of time-aware s=
cheduling. (Section 2, &quot;However, time-aware
 scheduling suffers from two major disadvantages.&quot;) Of course with a b=
ad design one may shoot in his/her own leg, but in well-designed scenarios =
efficiency loss can be eliminated without expensive computation.<o:p></o:p>=
</p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">6, Deadtime calculation is also complex if impact of=
 other DetNet flows must be considered. The pre-calculation of individual &=
quot;local&quot; deadlines may need to be re-calculated when flows added to=
 the network and they are using some common
 links. So I cannot agree with your statement. (Section 3, &quot;... Since =
the ingress router inserts the deadline stack into the packet headers, no o=
ther router needs to be aware of the requirements of the time sensitive flo=
ws.&nbsp; Hence admitting a new flow only
 requires updating the information base of the ingress router.&quot;). Addi=
ng a flow may result in updating many ingress routers' configuration.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Some topics for further discussions/consideration=
s:</b><o:p></o:p></p>
<p class=3D"MsoNormal">7, Impact of some DetNet functions (e.g., PREOF [RFC=
8655]) needs further discussions. The usage of replication/elimination impa=
cts the deadline calculation. Disjoint paths used by member flows requires =
different label stack and deadlines.
 Furthermore, these path specific labels+deadlines must be added by the rep=
lication node (PRF). So at least, a combination of PRF with B-SID and compu=
ting/adding deadlines (ingress SRTSN function) seems to be necessary in you=
r solution.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">8, The ever-green topic ( and not the green-wave :--=
))) ): label stack size. You need multiple labels per hop and the label sta=
ck contains them for each hop. Could result in a quite big label stack to b=
e pushed at the ingress (nx10s of
 labels).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I am happy to have further discussions on this inter=
esting idea<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks &amp; Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Bala'zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 2:14 PM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [Detnet] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
www.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7=
Cyaakov_s%40rad.com%7C270d392bafcf4742c92d08d8e1fc5c56%7Cf9047108cc2c4e4897=
a343fad1b3bf9d%7C1%7C0%7C637507821310056080%7CUnknown%7CTWFpbGZsb3d8eyJWIjo=
iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdat=
a=3Do332wbi4u5fb%2BKtUW1CsB3jz9OEd32h%2BazNaEDnDHJY%3D&amp;reserved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l0 level1 lfo3">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</body>
</html>

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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
CC: "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
Thread-Topic: WG Last Call draft-ietf-spring-nsh-sr
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Date: Mon, 8 Mar 2021 09:25:53 +0000
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Hi,

I have read the draft and support the publication.

Thanks,
Shunwan


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Wednesday, February 10, 2021 2:31 AM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]=
.

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr

--Bruno


___________________________________________________________________________=
______________________________________________



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I have read the draft and suppo=
rt the publication.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Shunwan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
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le=3D"font-size:10.5pt;color:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp=
;</o:p></span></a></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:ZH-CN">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:ZH-CN"> spring [mailto:spring-bounces@ietf.org]
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Wednesday, February 10, 2021 2:31 AM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I&#8217;ll forward th=
at call to the SFC WG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">Thanks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">[1] <a href=3D"https://tools.ietf.=
org/html/draft-ietf-spring-nsh-sr">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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To: Yaakov Stein <yaakov_s@rad.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/qJ6_Rg8s0GD28Ch6cCYzAp2VtoY>
Subject: Re: [spring] new draft on segment routing approach to TSN
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--_000_AM0PR0702MB3603D780FAD4BA967CC89D08AC939AM0PR0702MB3603_
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Hi Yaakov,

Thanks for the clarifications, that helps a lot to position correctly your =
draft.
As You have wrote: "Determinism is not the main goal of this draft" what
was not clear from the text.

I may be somewhat mis-leaded by the name You have used for the concept.
TSN is widely used in IEEE as "Time-Sensitive Networking" and its main targ=
et
is deterministic communication.

You may consider to use a different abbreviation to avoid that confusion. E=
.g.,
"srtsc" (segment routing time sensitive communication) or anything else You=
 like.

Many thanks
Bala'zs



From: Yaakov Stein <yaakov_s@rad.com>
Sent: Monday, March 8, 2021 8:27 AM
To: Bal=E1zs Varga A <balazs.a.varga@ericsson.com>; detnet@ietf.org; spring=
@ietf.org; pce@ietf.org
Subject: RE: new draft on segment routing approach to TSN

Bala'zs,

Sorry that I never got back to you on this.
It is much easier to shoot back replies to shorter emails :)

> 1, What is the node behavior if deadtime expires?
Nothing special is done if a local deadline is exceeded. There is still hop=
e that the time can be made up.
If too many packets fail to conform to their overall budget,
then maybe something has changed and reoptimization (or realizing that the =
application budget is not feasible) is required.

> 2, Do I understand it correctly that the described solution is practicall=
y a new per-hop-behavior?
Well, new to here but hardly "new" (similar things were done in ATM...)
The new per-router behavior requires a new data structure in the router ins=
tead of a FIFO queue,
but there is no absolute requirement for other tools.
As I just hinted and have mentioned in a previous email, later on we may ne=
ed some OAM to see if configuration needs to be updated.
I have already experimented with periodic RSVP-like synthetic packets that =
collect timestamps along the path.

> 3, Design of a guaranteed upper bound usually requires deterministic arri=
val at each node along the path.
Here is where we differ (or at least put different emphasis on the word "us=
ually".

Determinism is not the main goal of this draft. Meeting challenging delay b=
udgets is.
Sometimes absolute determinacy is required (e.g., in some forms of "telepro=
tection" in some electricity distribution networks)
in which case either TDM/Qbv/calendaring can be used, or this method couple=
d with a differential delay compensation buffer.

I agree that PDV increases from hop to hop to an extent, but when the delay=
 budget is really challenging you simply can't allow that many hops.
In mixed 5G xHaul cases in which I have been involved there are no more tha=
n 4 hops (usually fewer).

If you wish something more deterministic then look at the Andrews-Zhang str=
ategy.
They gate at the ingress router and EDF at all the following ones.
They show that (statistically) they ride "green waves" and thus the PDV doe=
sn't increase significantly
(see their graphs). This comes at the expense of a long cycle time for the =
initial gate, which means the budget can't be too tight.

> 4, Wire-speed timestamping and calculation
I come from the PTP world where hardware timestamping with submicro resolut=
ion is common.
Since the timestamp is on the rising edge of the first bit, i.e., before th=
e classifier,
it is carried out and placed in the packet metadata for every packet whethe=
r or not it is PTP.
I always shed tears over throwing out this information.
The RSVP-like method just mentioned simply copies it into the packet.
The SRTSN packets use this information in the scheduler.
I have consulted my ASIC people about the use of priority heaps and insert-=
queues
and they ensure me that they can put something like that into our 100G chip=
.

> 5, Time gated Queuing [802.1Qbv]
I didn't say that in principle you can't build a Qbv system that does great=
 things.
It is flexible enough to do anything you want.
The problem is the scalability.
I have played around with optimizing it and haven't found a good "on line" =
algorithm,
that is, a way of adding a new flow to an existing optimized design.
And even in the "off line" case (clean slate with all flows known) slight c=
hanges and even bad clocks in the user equipment ruins things.

But the main idea of this draft is that even given a good on-line algorithm=
 for Qbv
you would need to distribute the changes in the all the schedules to all th=
e routers.
What happens in the meantime? What happens when one router is already updat=
ed but another isn't?
With the stack method only a single ingress router needs to be updated and =
consistency is ensured!

> 6, Deadtime calculation is also complex if impact of other DetNet flows m=
ust be considered.
Of course! The offset vector needs to be optimized.
I have several such methods and am running simulations of various strategie=
s.
As stated in the ID the specific calculation was for illustration purposes =
-
the stack mechanism is much more generic.

> 7, Impact of some DetNet functions
I have not yet gotten to the point where I have considered this.

>  8, The ever-green topic ( and not the green-wave :--))) ): label stack s=
ize.
Yes, I didn't want to bring this up yet, but have been forced to.
I have to admit that I am not a fan of SRv6 for just this reason.
But, the SRTSN stack can be really small!
SR stack entries need only be ceil ( log2 (number of routers) ) in size (re=
quires a little local information base in the router)
assuming once the stack is popped you use the original DA. If you are not w=
illing to use this additional information
you still only need sufficient suffixes, which is still small.
The deadline entries can be miniscule since the wraparound constraint is de=
rived from the maximum flight time of a packet in the network.
In my designs I have gotten away with 16-32 bits per entry, which means 4-8=
 hop stacks only require the room of a single IPv6 address.

Hope this answers your questions and kicks off a fruitful discussion.

Y(J)S

From: Bal=E1zs Varga A <balazs.a.varga@ericsson.com<mailto:balazs.a.varga@e=
ricsson.com>>
Sent: 08/03/2021 08:35
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,
Any view on these comments?
Thanks
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Bal=E1zs Varga A
Sent: Friday, February 26, 2021 3:03 PM
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Hi Yaakov,

many thanks for this well-written and information-rich draft.
I have enjoyed to read it (and also the discussions on the lists). :--)))


Conceptual (clarification) questions:
1, What is the node behavior if deadtime expires? Drop? That requires a qui=
te good design/allocation of the latency budget. Otherwise it may result in=
 unnecessary loss of a packet being relative late at a hop, however that mi=
ght be compensated by the remaining hops. (E.g., see your Figure 2, getting=
 35 microsecond at R1 instead of the designed 25, but R2,R3,R4 adds only 10=
-10-10 extra microseconds). You may consider to add a "late flag" to the pa=
cket instead of a drop ...

2, Do I understand it correctly that the described solution is practically =
a new per-hop-behavior? Does it have no tools to "influence" the arrival ti=
me at the next hops? In end-to-end latency design the DetNet/TSN functions =
are often used to "adapt" the arrival of packets belonging to a DetNet flow=
/TSN stream at given network points. If "latency design" requires such a "t=
ime shift" then the described method has to be combined with other DetNet/T=
SN tools.

3, Design of a guaranteed upper bound usually requires deterministic arriva=
l at each node along the path. In this solution the flow becomes less-an-le=
ss deterministic as it reaches the destination. I mean e.g., as per Figure =
2, arrival time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-1=
20 usec and at R4 is 92-167 usec. So, the flow is getting less-and-less det=
erministic at each hop. That can make deterministic design of other flows p=
assing R4 more difficult or even impossible in some scenarios. Have I misse=
d something here?

4, Wire-speed timestamping and calculation: I would be interested in your v=
iew regarding how realistic are (1) the wire speed timestamping capability =
and (2) adding multiple calculated deadline to packets. Both are required f=
or this solution. DetNet flows can have high bandwidth, not like 1588 packe=
ts.


Specific comments (Section 2-3):
5, Time gated Queuing [802.1Qbv] allows multiple gates to be open simultane=
ously. Furthermore preemption [802.1Qbu] can be combined with Qbv. So I can=
not fully agree with your evaluation of time-aware scheduling. (Section 2, =
"However, time-aware scheduling suffers from two major disadvantages.") Of =
course with a bad design one may shoot in his/her own leg, but in well-desi=
gned scenarios efficiency loss can be eliminated without expensive computat=
ion.

6, Deadtime calculation is also complex if impact of other DetNet flows mus=
t be considered. The pre-calculation of individual "local" deadlines may ne=
ed to be re-calculated when flows added to the network and they are using s=
ome common links. So I cannot agree with your statement. (Section 3, "... S=
ince the ingress router inserts the deadline stack into the packet headers,=
 no other router needs to be aware of the requirements of the time sensitiv=
e flows.  Hence admitting a new flow only requires updating the information=
 base of the ingress router."). Adding a flow may result in updating many i=
ngress routers' configuration.


Some topics for further discussions/considerations:
7, Impact of some DetNet functions (e.g., PREOF [RFC8655]) needs further di=
scussions. The usage of replication/elimination impacts the deadline calcul=
ation. Disjoint paths used by member flows requires different label stack a=
nd deadlines. Furthermore, these path specific labels+deadlines must be add=
ed by the replication node (PRF). So at least, a combination of PRF with B-=
SID and computing/adding deadlines (ingress SRTSN function) seems to be nec=
essary in your solution.

8, The ever-green topic ( and not the green-wave :--))) ): label stack size=
. You need multiple labels per hop and the label stack contains them for ea=
ch hop. Could result in a quite big label stack to be pushed at the ingress=
 (nx10s of labels).


I am happy to have further discussions on this interesting idea

Thanks & Cheers
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 2:14 PM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [Detnet] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://protect2.fireeye.com/v1/url?k=3Dc3902=
149-9c0b184c-c39061d2-86d2114eab2f-ba16ddb9b86334c8&q=3D1&e=3D25a393fd-8aca=
-4a3b-914c-6ce612f6740b&u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outloo=
k.com%2F%3Furl%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdr=
aft-stein-srtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C270d=
392bafcf4742c92d08d8e1fc5c56%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257=
C0%257C637507821310056080%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL=
CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3Do332wbi4=
u5fb%252BKtUW1CsB3jz9OEd32h%252BazNaEDnDHJY%253D%26reserved%3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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break-word">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks for the clarifications, that helps a lot to p=
osition correctly your draft.<o:p></o:p></p>
<p class=3D"MsoNormal">As You have wrote: &#8220;Determinism is not the mai=
n goal of this draft&#8221; what
<o:p></o:p></p>
<p class=3D"MsoNormal">was not clear from the text.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I may be somewhat mis-leaded by the name You have us=
ed for the concept.
<o:p></o:p></p>
<p class=3D"MsoNormal">TSN is widely used in IEEE as &#8220;Time-Sensitive =
Networking&#8221; and its main target
<o:p></o:p></p>
<p class=3D"MsoNormal">is deterministic communication. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You may consider to use a different abbreviation to =
avoid that confusion. E.g.,<o:p></o:p></p>
<p class=3D"MsoNormal">&#8220;srtsc&#8221; (segment routing time sensitive =
communication) or anything else You like.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Many thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></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"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt; <=
br>
<b>Sent:</b> Monday, March 8, 2021 8:27 AM<br>
<b>To:</b> Bal=E1zs Varga A &lt;balazs.a.varga@ericsson.com&gt;; detnet@iet=
f.org; spring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Bala'zs,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry that I never got back to you on this. <o:p></o=
:p></p>
<p class=3D"MsoNormal">It is much easier to shoot back replies to shorter e=
mails :)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 1, What is the node behavior if deadtime expire=
s?<o:p></o:p></p>
<p class=3D"MsoNormal">Nothing special is done if a local deadline is excee=
ded. There is still hope that the time can be made up.<o:p></o:p></p>
<p class=3D"MsoNormal">If too many packets fail to conform to their overall=
 budget,
<o:p></o:p></p>
<p class=3D"MsoNormal">then maybe something has changed and reoptimization =
(or realizing that the application budget is not feasible) is required.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 2, Do I understand it correctly that the descri=
bed solution is practically a new per-hop-behavior?<o:p></o:p></p>
<p class=3D"MsoNormal">Well, new to here but hardly &#8220;new&#8221; (simi=
lar things were done in ATM&#8230;)<o:p></o:p></p>
<p class=3D"MsoNormal">The new per-router behavior requires a new data stru=
cture in the router instead of a FIFO queue,<o:p></o:p></p>
<p class=3D"MsoNormal">but there is no absolute requirement for other tools=
.<o:p></o:p></p>
<p class=3D"MsoNormal">As I just hinted and have mentioned in a previous em=
ail, later on we may need some OAM to see if configuration needs to be upda=
ted.<o:p></o:p></p>
<p class=3D"MsoNormal">I have already experimented with periodic RSVP-like =
synthetic packets that collect timestamps along the path.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 3, Design of a guaranteed upper bound usually r=
equires deterministic arrival at each node along the path.<o:p></o:p></p>
<p class=3D"MsoNormal">Here is where we differ (or at least put different e=
mphasis on the word &#8220;usually&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Determinism is not the main goal of this draft. Meet=
ing challenging delay budgets is.<o:p></o:p></p>
<p class=3D"MsoNormal">Sometimes absolute determinacy is required (e.g., in=
 some forms of &#8220;teleprotection&#8221; in some electricity distributio=
n networks)<o:p></o:p></p>
<p class=3D"MsoNormal">in which case either TDM/Qbv/calendaring can be used=
, or this method coupled with a differential delay compensation buffer.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I agree that PDV increases from hop to hop to an ext=
ent, but when the delay budget is really challenging you simply can&#8217;t=
 allow that many hops.<o:p></o:p></p>
<p class=3D"MsoNormal">In mixed 5G xHaul cases in which I have been involve=
d there are no more than 4 hops (usually fewer).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you wish something more deterministic then look a=
t the Andrews-Zhang strategy.<o:p></o:p></p>
<p class=3D"MsoNormal">They gate at the ingress router and EDF at all the f=
ollowing ones.<o:p></o:p></p>
<p class=3D"MsoNormal">They show that (statistically) they ride &#8220;gree=
n waves&#8221; and thus the PDV doesn&#8217;t increase significantly<o:p></=
o:p></p>
<p class=3D"MsoNormal">(see their graphs). This comes at the expense of a l=
ong cycle time for the initial gate, which means the budget can&#8217;t be =
too tight.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 4, Wire-speed timestamping and calculation<o:p>=
</o:p></p>
<p class=3D"MsoNormal">I come from the PTP world where hardware timestampin=
g with submicro resolution is common.<o:p></o:p></p>
<p class=3D"MsoNormal">Since the timestamp is on the rising edge of the fir=
st bit, i.e., before the classifier,<o:p></o:p></p>
<p class=3D"MsoNormal">it is carried out and placed in the packet metadata =
for every packet whether or not it is PTP.<o:p></o:p></p>
<p class=3D"MsoNormal">I always shed tears over throwing out this informati=
on. <o:p>
</o:p></p>
<p class=3D"MsoNormal">The RSVP-like method just mentioned simply copies it=
 into the packet.<o:p></o:p></p>
<p class=3D"MsoNormal">The SRTSN packets use this information in the schedu=
ler.<o:p></o:p></p>
<p class=3D"MsoNormal">I have consulted my ASIC people about the use of pri=
ority heaps and insert-queues<o:p></o:p></p>
<p class=3D"MsoNormal">and they ensure me that they can put something like =
that into our 100G chip.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 5, Time gated Queuing [802.1Qbv]<o:p></o:p></p>
<p class=3D"MsoNormal">I didn&#8217;t say that in principle you can&#8217;t=
 build a Qbv system that does great things.<o:p></o:p></p>
<p class=3D"MsoNormal">It is flexible enough to do anything you want.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">The problem is the scalability. <o:p></o:p></p>
<p class=3D"MsoNormal">I have played around with optimizing it and haven&#8=
217;t found a good &#8220;on line&#8221; algorithm,
<o:p></o:p></p>
<p class=3D"MsoNormal">that is, a way of adding a new flow to an existing o=
ptimized design.<o:p></o:p></p>
<p class=3D"MsoNormal">And even in the &#8220;off line&#8221; case (clean s=
late with all flows known) slight changes and even bad clocks in the user e=
quipment ruins things.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">But the main idea of this draft is that even given a=
 good on-line algorithm for Qbv<o:p></o:p></p>
<p class=3D"MsoNormal">you would need to distribute the changes in the all =
the schedules to all the routers.<o:p></o:p></p>
<p class=3D"MsoNormal">What happens in the meantime? What happens when one =
router is already updated but another isn&#8217;t?<o:p></o:p></p>
<p class=3D"MsoNormal">With the stack method only a single ingress router n=
eeds to be updated and consistency is ensured!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 6, Deadtime calculation is also complex if impa=
ct of other DetNet flows must be considered.<o:p></o:p></p>
<p class=3D"MsoNormal">Of course! The offset vector needs to be optimized.<=
o:p></o:p></p>
<p class=3D"MsoNormal">I have several such methods and am running simulatio=
ns of various strategies.<o:p></o:p></p>
<p class=3D"MsoNormal">As stated in the ID the specific calculation was for=
 illustration purposes &#8211;
<o:p></o:p></p>
<p class=3D"MsoNormal">the stack mechanism is much more generic.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; 7, Impact of some DetNet functions<o:p></o:p></=
p>
<p class=3D"MsoNormal">I have not yet gotten to the point where I have cons=
idered this.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&gt; &nbsp;8, The ever-green topic ( and not the gre=
en-wave :--))) ): label stack size.<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I didn&#8217;t want to bring this up yet, but h=
ave been forced to.<o:p></o:p></p>
<p class=3D"MsoNormal">I have to admit that I am not a fan of SRv6 for just=
 this reason.<o:p></o:p></p>
<p class=3D"MsoNormal">But, the SRTSN stack can be really small!<o:p></o:p>=
</p>
<p class=3D"MsoNormal">SR stack entries need only be ceil ( log2 (number of=
 routers) ) in size (requires a little local information base in the router=
)<o:p></o:p></p>
<p class=3D"MsoNormal">assuming once the stack is popped you use the origin=
al DA. If you are not willing to use this additional information
<o:p></o:p></p>
<p class=3D"MsoNormal">you still only need sufficient suffixes, which is st=
ill small.<o:p></o:p></p>
<p class=3D"MsoNormal">The deadline entries can be miniscule since the wrap=
around constraint is derived from the maximum flight time of a packet in th=
e network.<o:p></o:p></p>
<p class=3D"MsoNormal">In my designs I have gotten away with 16-32 bits per=
 entry, which means 4-8 hop stacks only require the room of a single IPv6 a=
ddress.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hope this answers your questions and kicks off a fru=
itful discussion.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Bal=E1zs Varga A &lt;<a href=3D"mailto:=
balazs.a.varga@ericsson.com">balazs.a.varga@ericsson.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 08:35<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
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<tr>
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<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov</span>,<o:p></=
o:p></p>
<p class=3D"MsoNormal">Any view on these comments?<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Bal=E1zs Varga A<br>
<b>Sent:</b> Friday, February 26, 2021 3:03 PM<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">many thanks for this well-written and information-ri=
ch draft.<o:p></o:p></p>
<p class=3D"MsoNormal">I have enjoyed to read it (and also the discussions =
on the lists). :--)))<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Conceptual (clarification) questions:</b><o:p></o=
:p></p>
<p class=3D"MsoNormal">1, What is the node behavior if deadtime expires? Dr=
op? That requires a quite good design/allocation of the latency budget. Oth=
erwise it may result in unnecessary loss of a packet being relative late at=
 a hop, however that might be compensated
 by the remaining hops. (E.g., see your Figure 2, getting 35 microsecond at=
 R1 instead of the designed 25, but R2,R3,R4 adds only 10-10-10 extra micro=
seconds). You may consider to add a &quot;late flag&quot; to the packet ins=
tead of a drop ...<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">2, Do I understand it correctly that the described s=
olution is practically a new per-hop-behavior? Does it have no tools to &qu=
ot;influence&quot; the arrival time at the next hops? In end-to-end latency=
 design the DetNet/TSN functions are often used
 to &quot;adapt&quot; the arrival of packets belonging to a DetNet flow/TSN=
 stream at given network points. If &quot;latency design&quot; requires suc=
h a &quot;time shift&quot; then the described method has to be combined wit=
h other DetNet/TSN tools.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">3, Design of a guaranteed upper bound usually requir=
es deterministic arrival at each node along the path. In this solution the =
flow becomes less-an-less deterministic as it reaches the destination. I me=
an e.g., as per Figure 2, arrival
 time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-120 usec an=
d at R4 is 92-167 usec. So, the flow is getting less-and-less deterministic=
 at each hop. That can make deterministic design of other flows passing R4 =
more difficult or even impossible
 in some scenarios. Have I missed something here?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">4, Wire-speed timestamping and calculation: I would =
be interested in your view regarding how realistic are (1) the wire speed t=
imestamping capability and (2) adding multiple calculated deadline to packe=
ts. Both are required for this solution.
 DetNet flows can have high bandwidth, not like 1588 packets.<o:p></o:p></p=
>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Specific comments (Section 2-3):</b><o:p></o:p></=
p>
<p class=3D"MsoNormal">5, Time gated Queuing [802.1Qbv] allows multiple gat=
es to be open simultaneously. Furthermore preemption [802.1Qbu] can be comb=
ined with Qbv. So I cannot fully agree with your evaluation of time-aware s=
cheduling. (Section 2, &quot;However, time-aware
 scheduling suffers from two major disadvantages.&quot;) Of course with a b=
ad design one may shoot in his/her own leg, but in well-designed scenarios =
efficiency loss can be eliminated without expensive computation.<o:p></o:p>=
</p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">6, Deadtime calculation is also complex if impact of=
 other DetNet flows must be considered. The pre-calculation of individual &=
quot;local&quot; deadlines may need to be re-calculated when flows added to=
 the network and they are using some common
 links. So I cannot agree with your statement. (Section 3, &quot;... Since =
the ingress router inserts the deadline stack into the packet headers, no o=
ther router needs to be aware of the requirements of the time sensitive flo=
ws.&nbsp; Hence admitting a new flow only
 requires updating the information base of the ingress router.&quot;). Addi=
ng a flow may result in updating many ingress routers' configuration.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Some topics for further discussions/consideration=
s:</b><o:p></o:p></p>
<p class=3D"MsoNormal">7, Impact of some DetNet functions (e.g., PREOF [RFC=
8655]) needs further discussions. The usage of replication/elimination impa=
cts the deadline calculation. Disjoint paths used by member flows requires =
different label stack and deadlines.
 Furthermore, these path specific labels+deadlines must be added by the rep=
lication node (PRF). So at least, a combination of PRF with B-SID and compu=
ting/adding deadlines (ingress SRTSN function) seems to be necessary in you=
r solution.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">8, The ever-green topic ( and not the green-wave :--=
))) ): label stack size. You need multiple labels per hop and the label sta=
ck contains them for each hop. Could result in a quite big label stack to b=
e pushed at the ingress (nx10s of
 labels).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I am happy to have further discussions on this inter=
esting idea<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks &amp; Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Bala'zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 2:14 PM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [Detnet] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://protect2.fireeye.com/v1/url?k=3Dc3902149-9c0b184c-c39061d2-8=
6d2114eab2f-ba16ddb9b86334c8&amp;q=3D1&amp;e=3D25a393fd-8aca-4a3b-914c-6ce6=
12f6740b&amp;u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outlook.com%2F%3F=
url%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdraft-stein-s=
rtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C270d392bafcf474=
2c92d08d8e1fc5c56%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257C0%257C6375=
07821310056080%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu=
MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3Do332wbi4u5fb%252BKt=
UW1CsB3jz9OEd32h%252BazNaEDnDHJY%253D%26reserved%3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l0 level1 lfo3">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
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From: Yaakov Stein <yaakov_s@rad.com>
To: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/2kMg798FMBOoWVFKKkmNESwDOgA>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Bala'zs,

The IEEE definition of TSN mentions determinism, but defines it not as cons=
tant delay as in a TDM service, but rather as
to provide deterministic services through IEEE 802 networks,
i.e., guaranteed packet transport with bounded latency, low packet delay va=
riation, and low packet loss.
So "determinism" in this context means bounded latency, low PDV and low PLR=
.

DetNet is aligned with this definition. From the charter:
deterministic data paths that operate over Layer 2 bridged and Layer 3 rout=
ed segments, where such paths can provide bounds on latency, loss, and pack=
et delay variation (jitter), and high reliability.
So it is the path that is deterministic, but the packet parameters need to =
be bounded.

In Carrier grade Ethernet "determinism" is usually taken to mean that a flo=
w is pinned to a path,
that is, we know precisely which network elements a packet will traverse,
although delay, PLR, etc. are parameters to be set and/or measured.

When I say that a packet or flow is "time sensitive" I merely mean that the=
re is a time budget to be attained.

However, SRTSN by any other name smells as sweet to me.
Stack-based Time-sensitive Enhancements for Immediate-delivery Networking (=
STEIN) could also work :) .

Y(J)S

From: Bal=E1zs Varga A <balazs.a.varga@ericsson.com>
Sent: 08/03/2021 11:59
To: Yaakov Stein <yaakov_s@rad.com>; detnet@ietf.org; spring@ietf.org; pce@=
ietf.org
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Thanks for the clarifications, that helps a lot to position correctly your =
draft.
As You have wrote: "Determinism is not the main goal of this draft" what
was not clear from the text.

I may be somewhat mis-leaded by the name You have used for the concept.
TSN is widely used in IEEE as "Time-Sensitive Networking" and its main targ=
et
is deterministic communication.

You may consider to use a different abbreviation to avoid that confusion. E=
.g.,
"srtsc" (segment routing time sensitive communication) or anything else You=
 like.

Many thanks
Bala'zs



From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Monday, March 8, 2021 8:27 AM
To: Bal=E1zs Varga A <balazs.a.varga@ericsson.com<mailto:balazs.a.varga@eri=
csson.com>>; detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailt=
o:spring@ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Bala'zs,

Sorry that I never got back to you on this.
It is much easier to shoot back replies to shorter emails :)

> 1, What is the node behavior if deadtime expires?
Nothing special is done if a local deadline is exceeded. There is still hop=
e that the time can be made up.
If too many packets fail to conform to their overall budget,
then maybe something has changed and reoptimization (or realizing that the =
application budget is not feasible) is required.

> 2, Do I understand it correctly that the described solution is practicall=
y a new per-hop-behavior?
Well, new to here but hardly "new" (similar things were done in ATM...)
The new per-router behavior requires a new data structure in the router ins=
tead of a FIFO queue,
but there is no absolute requirement for other tools.
As I just hinted and have mentioned in a previous email, later on we may ne=
ed some OAM to see if configuration needs to be updated.
I have already experimented with periodic RSVP-like synthetic packets that =
collect timestamps along the path.

> 3, Design of a guaranteed upper bound usually requires deterministic arri=
val at each node along the path.
Here is where we differ (or at least put different emphasis on the word "us=
ually".

Determinism is not the main goal of this draft. Meeting challenging delay b=
udgets is.
Sometimes absolute determinacy is required (e.g., in some forms of "telepro=
tection" in some electricity distribution networks)
in which case either TDM/Qbv/calendaring can be used, or this method couple=
d with a differential delay compensation buffer.

I agree that PDV increases from hop to hop to an extent, but when the delay=
 budget is really challenging you simply can't allow that many hops.
In mixed 5G xHaul cases in which I have been involved there are no more tha=
n 4 hops (usually fewer).

If you wish something more deterministic then look at the Andrews-Zhang str=
ategy.
They gate at the ingress router and EDF at all the following ones.
They show that (statistically) they ride "green waves" and thus the PDV doe=
sn't increase significantly
(see their graphs). This comes at the expense of a long cycle time for the =
initial gate, which means the budget can't be too tight.

> 4, Wire-speed timestamping and calculation
I come from the PTP world where hardware timestamping with submicro resolut=
ion is common.
Since the timestamp is on the rising edge of the first bit, i.e., before th=
e classifier,
it is carried out and placed in the packet metadata for every packet whethe=
r or not it is PTP.
I always shed tears over throwing out this information.
The RSVP-like method just mentioned simply copies it into the packet.
The SRTSN packets use this information in the scheduler.
I have consulted my ASIC people about the use of priority heaps and insert-=
queues
and they ensure me that they can put something like that into our 100G chip=
.

> 5, Time gated Queuing [802.1Qbv]
I didn't say that in principle you can't build a Qbv system that does great=
 things.
It is flexible enough to do anything you want.
The problem is the scalability.
I have played around with optimizing it and haven't found a good "on line" =
algorithm,
that is, a way of adding a new flow to an existing optimized design.
And even in the "off line" case (clean slate with all flows known) slight c=
hanges and even bad clocks in the user equipment ruins things.

But the main idea of this draft is that even given a good on-line algorithm=
 for Qbv
you would need to distribute the changes in the all the schedules to all th=
e routers.
What happens in the meantime? What happens when one router is already updat=
ed but another isn't?
With the stack method only a single ingress router needs to be updated and =
consistency is ensured!

> 6, Deadtime calculation is also complex if impact of other DetNet flows m=
ust be considered.
Of course! The offset vector needs to be optimized.
I have several such methods and am running simulations of various strategie=
s.
As stated in the ID the specific calculation was for illustration purposes =
-
the stack mechanism is much more generic.

> 7, Impact of some DetNet functions
I have not yet gotten to the point where I have considered this.

>  8, The ever-green topic ( and not the green-wave :--))) ): label stack s=
ize.
Yes, I didn't want to bring this up yet, but have been forced to.
I have to admit that I am not a fan of SRv6 for just this reason.
But, the SRTSN stack can be really small!
SR stack entries need only be ceil ( log2 (number of routers) ) in size (re=
quires a little local information base in the router)
assuming once the stack is popped you use the original DA. If you are not w=
illing to use this additional information
you still only need sufficient suffixes, which is still small.
The deadline entries can be miniscule since the wraparound constraint is de=
rived from the maximum flight time of a packet in the network.
In my designs I have gotten away with 16-32 bits per entry, which means 4-8=
 hop stacks only require the room of a single IPv6 address.

Hope this answers your questions and kicks off a fruitful discussion.

Y(J)S

From: Bal=E1zs Varga A <balazs.a.varga@ericsson.com<mailto:balazs.a.varga@e=
ricsson.com>>
Sent: 08/03/2021 08:35
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,
Any view on these comments?
Thanks
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Bal=E1zs Varga A
Sent: Friday, February 26, 2021 3:03 PM
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Hi Yaakov,

many thanks for this well-written and information-rich draft.
I have enjoyed to read it (and also the discussions on the lists). :--)))


Conceptual (clarification) questions:
1, What is the node behavior if deadtime expires? Drop? That requires a qui=
te good design/allocation of the latency budget. Otherwise it may result in=
 unnecessary loss of a packet being relative late at a hop, however that mi=
ght be compensated by the remaining hops. (E.g., see your Figure 2, getting=
 35 microsecond at R1 instead of the designed 25, but R2,R3,R4 adds only 10=
-10-10 extra microseconds). You may consider to add a "late flag" to the pa=
cket instead of a drop ...

2, Do I understand it correctly that the described solution is practically =
a new per-hop-behavior? Does it have no tools to "influence" the arrival ti=
me at the next hops? In end-to-end latency design the DetNet/TSN functions =
are often used to "adapt" the arrival of packets belonging to a DetNet flow=
/TSN stream at given network points. If "latency design" requires such a "t=
ime shift" then the described method has to be combined with other DetNet/T=
SN tools.

3, Design of a guaranteed upper bound usually requires deterministic arriva=
l at each node along the path. In this solution the flow becomes less-an-le=
ss deterministic as it reaches the destination. I mean e.g., as per Figure =
2, arrival time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-1=
20 usec and at R4 is 92-167 usec. So, the flow is getting less-and-less det=
erministic at each hop. That can make deterministic design of other flows p=
assing R4 more difficult or even impossible in some scenarios. Have I misse=
d something here?

4, Wire-speed timestamping and calculation: I would be interested in your v=
iew regarding how realistic are (1) the wire speed timestamping capability =
and (2) adding multiple calculated deadline to packets. Both are required f=
or this solution. DetNet flows can have high bandwidth, not like 1588 packe=
ts.


Specific comments (Section 2-3):
5, Time gated Queuing [802.1Qbv] allows multiple gates to be open simultane=
ously. Furthermore preemption [802.1Qbu] can be combined with Qbv. So I can=
not fully agree with your evaluation of time-aware scheduling. (Section 2, =
"However, time-aware scheduling suffers from two major disadvantages.") Of =
course with a bad design one may shoot in his/her own leg, but in well-desi=
gned scenarios efficiency loss can be eliminated without expensive computat=
ion.

6, Deadtime calculation is also complex if impact of other DetNet flows mus=
t be considered. The pre-calculation of individual "local" deadlines may ne=
ed to be re-calculated when flows added to the network and they are using s=
ome common links. So I cannot agree with your statement. (Section 3, "... S=
ince the ingress router inserts the deadline stack into the packet headers,=
 no other router needs to be aware of the requirements of the time sensitiv=
e flows.  Hence admitting a new flow only requires updating the information=
 base of the ingress router."). Adding a flow may result in updating many i=
ngress routers' configuration.


Some topics for further discussions/considerations:
7, Impact of some DetNet functions (e.g., PREOF [RFC8655]) needs further di=
scussions. The usage of replication/elimination impacts the deadline calcul=
ation. Disjoint paths used by member flows requires different label stack a=
nd deadlines. Furthermore, these path specific labels+deadlines must be add=
ed by the replication node (PRF). So at least, a combination of PRF with B-=
SID and computing/adding deadlines (ingress SRTSN function) seems to be nec=
essary in your solution.

8, The ever-green topic ( and not the green-wave :--))) ): label stack size=
. You need multiple labels per hop and the label stack contains them for ea=
ch hop. Could result in a quite big label stack to be pushed at the ingress=
 (nx10s of labels).


I am happy to have further discussions on this interesting idea

Thanks & Cheers
Bala'zs

From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 2:14 PM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [Detnet] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fprotect2.fireeye.com%2Fv1%2Furl%3Fk%3Dc3902149-9c0b1=
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-914c-6ce612f6740b%26u%3Dhttps%253A%252F%252Feur01.safelinks.protection.out=
look.com%252F%253Furl%253Dhttps%25253A%25252F%25252Fwww.ietf.org%25252Farch=
ive%25252Fid%25252Fdraft-stein-srtsn-00.txt%2526data%253D04%25257C01%25257C=
yaakov_s%252540rad.com%25257C270d392bafcf4742c92d08d8e1fc5c56%25257Cf904710=
8cc2c4e4897a343fad1b3bf9d%25257C1%25257C0%25257C637507821310056080%25257CUn=
known%25257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWw=
iLCJXVCI6Mn0%25253D%25257C1000%2526sdata%253Do332wbi4u5fb%25252BKtUW1CsB3jz=
9OEd32h%25252BazNaEDnDHJY%25253D%2526reserved%253D0&data=3D04%7C01%7Cyaakov=
_s%40rad.com%7C1b7b95bc875e48d5a3fe08d8e218cc62%7Cf9047108cc2c4e4897a343fad=
1b3bf9d%7C1%7C0%7C637507943449085449%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLj=
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fpslb%2BsCSQrmBzcA2fhopPw3GAj9me0v7xqdk0%3D&reserved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bala&#8217;zs, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The IEEE definition of TSN mentions determinism, but=
 defines it not as constant delay as in a TDM service, but rather as<o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.5pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:#333333;background:white"></span>to provide dete=
rministic services through IEEE 802 networks,
<o:p></o:p></p>
<p class=3D"MsoNormal">i.e., guaranteed packet transport with bounded laten=
cy, low packet delay variation, and low packet loss.&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">So &#8220;determinism&#8221; in this context means b=
ounded latency, low PDV and low PLR.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">DetNet is aligned with this definition. From the cha=
rter:<o:p></o:p></p>
<p class=3D"MsoNormal">deterministic data paths that operate over Layer 2 b=
ridged and Layer 3 routed segments, where such paths can provide bounds on =
latency, loss, and packet delay variation (jitter), and high reliability.<o=
:p></o:p></p>
<p class=3D"MsoNormal">So it is the path that is deterministic, but the pac=
ket parameters need to be bounded.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In Carrier grade Ethernet &#8220;determinism&#8221; =
is usually taken to mean that a flow is pinned to a path,<o:p></o:p></p>
<p class=3D"MsoNormal">that is, we know precisely which network elements a =
packet will traverse,<o:p></o:p></p>
<p class=3D"MsoNormal">although delay, PLR, etc. are parameters to be set a=
nd/or measured.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">When I say that a packet or flow is &#8221;time sens=
itive&#8221; I merely mean that there is a time budget to be attained.<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">However, SRTSN by any other name smells as sweet to =
me.<o:p></o:p></p>
<p class=3D"MsoNormal">Stack-based Time-sensitive Enhancements for Immediat=
e-delivery Networking (STEIN) could also work :) .<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Bal=E1zs Varga A &lt;balazs.a.varga@eri=
csson.com&gt; <br>
<b>Sent:</b> 08/03/2021 11:59<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; detnet@ietf.org; spring@i=
etf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks for the clarifications, that helps a lot to p=
osition correctly your draft.<o:p></o:p></p>
<p class=3D"MsoNormal">As You have wrote: &#8220;Determinism is not the mai=
n goal of this draft&#8221; what
<o:p></o:p></p>
<p class=3D"MsoNormal">was not clear from the text.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I may be somewhat mis-leaded by the name You have us=
ed for the concept.
<o:p></o:p></p>
<p class=3D"MsoNormal">TSN is widely used in IEEE as &#8220;Time-Sensitive =
Networking&#8221; and its main target
<o:p></o:p></p>
<p class=3D"MsoNormal">is deterministic communication. <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">You may consider to use a different abbreviation to =
avoid that confusion. E.g.,<o:p></o:p></p>
<p class=3D"MsoNormal">&#8220;srtsc&#8221; (segment routing time sensitive =
communication) or anything else You like.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Many thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yaakov Stein &lt;<a href=3D"mailto:yaak=
ov_s@rad.com">yaakov_s@rad.com</a>&gt;
<br>
<b>Sent:</b> Monday, March 8, 2021 8:27 AM<br>
<b>To:</b> Bal=E1zs Varga A &lt;<a href=3D"mailto:balazs.a.varga@ericsson.c=
om">balazs.a.varga@ericsson.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Bala'zs,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Sorry that I never got back to you on this. <o:p></o=
:p></p>
<p class=3D"MsoNormal">It is much easier to shoot back replies to shorter e=
mails :)<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 1, What is the node behavior if deadtime expire=
s?<o:p></o:p></p>
<p class=3D"MsoNormal">Nothing special is done if a local deadline is excee=
ded. There is still hope that the time can be made up.<o:p></o:p></p>
<p class=3D"MsoNormal">If too many packets fail to conform to their overall=
 budget,
<o:p></o:p></p>
<p class=3D"MsoNormal">then maybe something has changed and reoptimization =
(or realizing that the application budget is not feasible) is required.<o:p=
></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 2, Do I understand it correctly that the descri=
bed solution is practically a new per-hop-behavior?<o:p></o:p></p>
<p class=3D"MsoNormal">Well, new to here but hardly &#8220;new&#8221; (simi=
lar things were done in ATM&#8230;)<o:p></o:p></p>
<p class=3D"MsoNormal">The new per-router behavior requires a new data stru=
cture in the router instead of a FIFO queue,<o:p></o:p></p>
<p class=3D"MsoNormal">but there is no absolute requirement for other tools=
.<o:p></o:p></p>
<p class=3D"MsoNormal">As I just hinted and have mentioned in a previous em=
ail, later on we may need some OAM to see if configuration needs to be upda=
ted.<o:p></o:p></p>
<p class=3D"MsoNormal">I have already experimented with periodic RSVP-like =
synthetic packets that collect timestamps along the path.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 3, Design of a guaranteed upper bound usually r=
equires deterministic arrival at each node along the path.<o:p></o:p></p>
<p class=3D"MsoNormal">Here is where we differ (or at least put different e=
mphasis on the word &#8220;usually&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Determinism is not the main goal of this draft. Meet=
ing challenging delay budgets is.<o:p></o:p></p>
<p class=3D"MsoNormal">Sometimes absolute determinacy is required (e.g., in=
 some forms of &#8220;teleprotection&#8221; in some electricity distributio=
n networks)<o:p></o:p></p>
<p class=3D"MsoNormal">in which case either TDM/Qbv/calendaring can be used=
, or this method coupled with a differential delay compensation buffer.<o:p=
></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that PDV increases from hop to hop to an ext=
ent, but when the delay budget is really challenging you simply can&#8217;t=
 allow that many hops.<o:p></o:p></p>
<p class=3D"MsoNormal">In mixed 5G xHaul cases in which I have been involve=
d there are no more than 4 hops (usually fewer).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">If you wish something more deterministic then look a=
t the Andrews-Zhang strategy.<o:p></o:p></p>
<p class=3D"MsoNormal">They gate at the ingress router and EDF at all the f=
ollowing ones.<o:p></o:p></p>
<p class=3D"MsoNormal">They show that (statistically) they ride &#8220;gree=
n waves&#8221; and thus the PDV doesn&#8217;t increase significantly<o:p></=
o:p></p>
<p class=3D"MsoNormal">(see their graphs). This comes at the expense of a l=
ong cycle time for the initial gate, which means the budget can&#8217;t be =
too tight.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 4, Wire-speed timestamping and calculation<o:p>=
</o:p></p>
<p class=3D"MsoNormal">I come from the PTP world where hardware timestampin=
g with submicro resolution is common.<o:p></o:p></p>
<p class=3D"MsoNormal">Since the timestamp is on the rising edge of the fir=
st bit, i.e., before the classifier,<o:p></o:p></p>
<p class=3D"MsoNormal">it is carried out and placed in the packet metadata =
for every packet whether or not it is PTP.<o:p></o:p></p>
<p class=3D"MsoNormal">I always shed tears over throwing out this informati=
on. <o:p>
</o:p></p>
<p class=3D"MsoNormal">The RSVP-like method just mentioned simply copies it=
 into the packet.<o:p></o:p></p>
<p class=3D"MsoNormal">The SRTSN packets use this information in the schedu=
ler.<o:p></o:p></p>
<p class=3D"MsoNormal">I have consulted my ASIC people about the use of pri=
ority heaps and insert-queues<o:p></o:p></p>
<p class=3D"MsoNormal">and they ensure me that they can put something like =
that into our 100G chip.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 5, Time gated Queuing [802.1Qbv]<o:p></o:p></p>
<p class=3D"MsoNormal">I didn&#8217;t say that in principle you can&#8217;t=
 build a Qbv system that does great things.<o:p></o:p></p>
<p class=3D"MsoNormal">It is flexible enough to do anything you want.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">The problem is the scalability. <o:p></o:p></p>
<p class=3D"MsoNormal">I have played around with optimizing it and haven&#8=
217;t found a good &#8220;on line&#8221; algorithm,
<o:p></o:p></p>
<p class=3D"MsoNormal">that is, a way of adding a new flow to an existing o=
ptimized design.<o:p></o:p></p>
<p class=3D"MsoNormal">And even in the &#8220;off line&#8221; case (clean s=
late with all flows known) slight changes and even bad clocks in the user e=
quipment ruins things.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">But the main idea of this draft is that even given a=
 good on-line algorithm for Qbv<o:p></o:p></p>
<p class=3D"MsoNormal">you would need to distribute the changes in the all =
the schedules to all the routers.<o:p></o:p></p>
<p class=3D"MsoNormal">What happens in the meantime? What happens when one =
router is already updated but another isn&#8217;t?<o:p></o:p></p>
<p class=3D"MsoNormal">With the stack method only a single ingress router n=
eeds to be updated and consistency is ensured!<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 6, Deadtime calculation is also complex if impa=
ct of other DetNet flows must be considered.<o:p></o:p></p>
<p class=3D"MsoNormal">Of course! The offset vector needs to be optimized.<=
o:p></o:p></p>
<p class=3D"MsoNormal">I have several such methods and am running simulatio=
ns of various strategies.<o:p></o:p></p>
<p class=3D"MsoNormal">As stated in the ID the specific calculation was for=
 illustration purposes &#8211;
<o:p></o:p></p>
<p class=3D"MsoNormal">the stack mechanism is much more generic.<o:p></o:p>=
</p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; 7, Impact of some DetNet functions<o:p></o:p></=
p>
<p class=3D"MsoNormal">I have not yet gotten to the point where I have cons=
idered this.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; &nbsp;8, The ever-green topic ( and not the gre=
en-wave :--))) ): label stack size.<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I didn&#8217;t want to bring this up yet, but h=
ave been forced to.<o:p></o:p></p>
<p class=3D"MsoNormal">I have to admit that I am not a fan of SRv6 for just=
 this reason.<o:p></o:p></p>
<p class=3D"MsoNormal">But, the SRTSN stack can be really small!<o:p></o:p>=
</p>
<p class=3D"MsoNormal">SR stack entries need only be ceil ( log2 (number of=
 routers) ) in size (requires a little local information base in the router=
)<o:p></o:p></p>
<p class=3D"MsoNormal">assuming once the stack is popped you use the origin=
al DA. If you are not willing to use this additional information
<o:p></o:p></p>
<p class=3D"MsoNormal">you still only need sufficient suffixes, which is st=
ill small.<o:p></o:p></p>
<p class=3D"MsoNormal">The deadline entries can be miniscule since the wrap=
around constraint is derived from the maximum flight time of a packet in th=
e network.<o:p></o:p></p>
<p class=3D"MsoNormal">In my designs I have gotten away with 16-32 bits per=
 entry, which means 4-8 hop stacks only require the room of a single IPv6 a=
ddress.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hope this answers your questions and kicks off a fru=
itful discussion.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Bal=E1zs Varga A &lt;<a href=3D"mailto:=
balazs.a.varga@ericsson.com">balazs.a.varga@ericsson.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 08:35<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov</span>,<o:p></=
o:p></p>
<p class=3D"MsoNormal">Any view on these comments?<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Bal=E1zs Varga A<br>
<b>Sent:</b> Friday, February 26, 2021 3:03 PM<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">many thanks for this well-written and information-ri=
ch draft.<o:p></o:p></p>
<p class=3D"MsoNormal">I have enjoyed to read it (and also the discussions =
on the lists). :--)))<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Conceptual (clarification) questions:</b><o:p></o=
:p></p>
<p class=3D"MsoNormal">1, What is the node behavior if deadtime expires? Dr=
op? That requires a quite good design/allocation of the latency budget. Oth=
erwise it may result in unnecessary loss of a packet being relative late at=
 a hop, however that might be compensated
 by the remaining hops. (E.g., see your Figure 2, getting 35 microsecond at=
 R1 instead of the designed 25, but R2,R3,R4 adds only 10-10-10 extra micro=
seconds). You may consider to add a &quot;late flag&quot; to the packet ins=
tead of a drop ...<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">2, Do I understand it correctly that the described s=
olution is practically a new per-hop-behavior? Does it have no tools to &qu=
ot;influence&quot; the arrival time at the next hops? In end-to-end latency=
 design the DetNet/TSN functions are often used
 to &quot;adapt&quot; the arrival of packets belonging to a DetNet flow/TSN=
 stream at given network points. If &quot;latency design&quot; requires suc=
h a &quot;time shift&quot; then the described method has to be combined wit=
h other DetNet/TSN tools.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">3, Design of a guaranteed upper bound usually requir=
es deterministic arrival at each node along the path. In this solution the =
flow becomes less-an-less deterministic as it reaches the destination. I me=
an e.g., as per Figure 2, arrival
 time range at R1 is 2-2 usec, at R2 is 26-51 usec, at R3 is 70-120 usec an=
d at R4 is 92-167 usec. So, the flow is getting less-and-less deterministic=
 at each hop. That can make deterministic design of other flows passing R4 =
more difficult or even impossible
 in some scenarios. Have I missed something here?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">4, Wire-speed timestamping and calculation: I would =
be interested in your view regarding how realistic are (1) the wire speed t=
imestamping capability and (2) adding multiple calculated deadline to packe=
ts. Both are required for this solution.
 DetNet flows can have high bandwidth, not like 1588 packets.<o:p></o:p></p=
>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Specific comments (Section 2-3):</b><o:p></o:p></=
p>
<p class=3D"MsoNormal">5, Time gated Queuing [802.1Qbv] allows multiple gat=
es to be open simultaneously. Furthermore preemption [802.1Qbu] can be comb=
ined with Qbv. So I cannot fully agree with your evaluation of time-aware s=
cheduling. (Section 2, &quot;However, time-aware
 scheduling suffers from two major disadvantages.&quot;) Of course with a b=
ad design one may shoot in his/her own leg, but in well-designed scenarios =
efficiency loss can be eliminated without expensive computation.<o:p></o:p>=
</p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">6, Deadtime calculation is also complex if impact of=
 other DetNet flows must be considered. The pre-calculation of individual &=
quot;local&quot; deadlines may need to be re-calculated when flows added to=
 the network and they are using some common
 links. So I cannot agree with your statement. (Section 3, &quot;... Since =
the ingress router inserts the deadline stack into the packet headers, no o=
ther router needs to be aware of the requirements of the time sensitive flo=
ws.&nbsp; Hence admitting a new flow only
 requires updating the information base of the ingress router.&quot;). Addi=
ng a flow may result in updating many ingress routers' configuration.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><b>Some topics for further discussions/consideration=
s:</b><o:p></o:p></p>
<p class=3D"MsoNormal">7, Impact of some DetNet functions (e.g., PREOF [RFC=
8655]) needs further discussions. The usage of replication/elimination impa=
cts the deadline calculation. Disjoint paths used by member flows requires =
different label stack and deadlines.
 Furthermore, these path specific labels+deadlines must be added by the rep=
lication node (PRF). So at least, a combination of PRF with B-SID and compu=
ting/adding deadlines (ingress SRTSN function) seems to be necessary in you=
r solution.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">8, The ever-green topic ( and not the green-wave :--=
))) ): label stack size. You need multiple labels per hop and the label sta=
ck contains them for each hop. Could result in a quite big label stack to b=
e pushed at the ingress (nx10s of
 labels).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I am happy to have further discussions on this inter=
esting idea<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks &amp; Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Bala'zs<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;<a href=3D"mailto:detnet-bou=
nces@ietf.org">detnet-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 2:14 PM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [Detnet] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F=
protect2.fireeye.com%2Fv1%2Furl%3Fk%3Dc3902149-9c0b184c-c39061d2-86d2114eab=
2f-ba16ddb9b86334c8%26q%3D1%26e%3D25a393fd-8aca-4a3b-914c-6ce612f6740b%26u%=
3Dhttps%253A%252F%252Feur01.safelinks.protection.outlook.com%252F%253Furl%2=
53Dhttps%25253A%25252F%25252Fwww.ietf.org%25252Farchive%25252Fid%25252Fdraf=
t-stein-srtsn-00.txt%2526data%253D04%25257C01%25257Cyaakov_s%252540rad.com%=
25257C270d392bafcf4742c92d08d8e1fc5c56%25257Cf9047108cc2c4e4897a343fad1b3bf=
9d%25257C1%25257C0%25257C637507821310056080%25257CUnknown%25257CTWFpbGZsb3d=
8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%25253D%252=
57C1000%2526sdata%253Do332wbi4u5fb%25252BKtUW1CsB3jz9OEd32h%25252BazNaEDnDH=
JY%25253D%2526reserved%253D0&amp;data=3D04%7C01%7Cyaakov_s%40rad.com%7C1b7b=
95bc875e48d5a3fe08d8e218cc62%7Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C6=
37507943449085449%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM=
zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DQ%2BfWafpslb%2BsCSQrmB=
zcA2fhopPw3GAj9me0v7xqdk0%3D&amp;reserved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3">DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.<o:p></o:p></li><li class=3D"MsoListPara=
graph" style=3D"margin-left:0in;mso-list:l1 level1 lfo3">Spring is also dir=
ectly relevant due to the use of a stack in the header and the combined app=
roach just mentioned.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0in;mso-list:l1 level1 lfo3">PCE is relevant to the case of=
 a central server jointly computing an optimal path and local deadline stac=
k.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</body>
</html>

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From: Huzhibo <huzhibo@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
CC: "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
Thread-Topic: WG Last Call draft-ietf-spring-nsh-sr
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Hi,

I have read the draft and support the publication.

Thanks,
Zhibo

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Friday, March 5, 2021 1:45 AM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

We received very few support and review so far: two reviews excluding the a=
uthors and including the shepherd.
Thanks Greg for the review.

To allow for more feedback, the WG last call is extended for two weeks unti=
l March 18.

In the meantime, authors are invited to reply to the comments sent on the l=
ist.

Thanks,
--Bruno

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com<mailto:bruno.decraene@orange.com>
Sent: Tuesday, February 9, 2021 7:31 PM
To: spring@ietf.org<mailto:spring@ietf.org>
Cc: draft-ietf-spring-nsh-sr@ietf.org<mailto:draft-ietf-spring-nsh-sr@ietf.=
org>
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]=
.

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr

--Bruno


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</head>
<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I have read the draft and suppo=
rt the publication.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"font-family:SimSun;mso=
-fareast-language:ZH-CN">Zhibo</span><span lang=3D"EN-GB"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:ZH-CN">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:ZH-CN"> spring [mailto:spring-bounces@ietf.org]
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Friday, March 5, 2021 1:45 AM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> Re: [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:=
p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Dear WG,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">We rece=
ived very few support and review so far: two reviews excluding the authors =
and including the shepherd.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
Greg for the review.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">To allo=
w for more feedback, the WG last call is extended for two weeks until March=
 18.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">In the =
meantime, authors are invited to reply to the comments sent on the list.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">--Bruno=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"mso-fareast-language:F=
R">From:</span></b><span lang=3D"FR" style=3D"mso-fareast-language:FR"> spr=
ing [<a href=3D"mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.=
org</a>]
<b>On Behalf Of </b><a href=3D"mailto:bruno.decraene@orange.com">bruno.decr=
aene@orange.com</a><br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-spring-nsh-sr@ietf.org">draft-ietf-=
spring-nsh-sr@ietf.org</a><br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I&#8217;ll forward th=
at call to the SFC WG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">Thanks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">[1] <a href=3D"https://tools.ietf.=
org/html/draft-ietf-spring-nsh-sr">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
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<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
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<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
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<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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From: "Liubingyang (Bryan)" <liubingyang@huawei.com>
To: Yaakov Stein <yaakov_s@rad.com>, Haoyu Song <haoyu.song@futurewei.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Subject: Re: [spring] new draft on segment routing approach to TSN
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Hi Yaakov,

Great work. One suggestion.
If we divide the end-to-end delay budget to per-hop budgets, and carry them=
 in SR header, we can mimic using the end-to-end absolute deadline. One thi=
ng we need to do is, when the actual time used in a hop is less than the bu=
dget of this hop, you can add the remaining budget to the budget of next ho=
p. In this case, you can save a lot of bits used for time, and you don't ha=
ve to rely on accurate time sync.

Bryan (Bingyang Liu)

From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, March 8, 2021 1:37 PM
To: Haoyu Song <haoyu.song@futurewei.com>; detnet@ietf.org; spring@ietf.org=
; pce@ietf.org
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We'll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN



CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.

Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.

1)      The use of clock time as deadline requires network synchronization,=
 and accurate measurement of per-link propagation time, which can somehow l=
imit the application scope of this work. Alternatively, one can simply budg=
et a device latency which require a router/switch to obey. In case the over=
all budget is evenly divided by the hops, a single parameter is enough. Of =
course, if one wants to customize the budget on each hop (which might be ne=
cessary considering the different capability/capacity of each hop), a stack=
 is still needed.
2)      Mechanism should be provisioned to track where the timing requireme=
nt is violated and by how much (e.g., using timestamp or flag). This would =
be very useful for troubleshooting.
3)      Recently programmable scheduler research has proposed several primi=
tives such as PIPO and PIEO and provided feasible hardware implementations.=
 The scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Cyaakov_s%40rad.com%7Ccf886b3eaea04f141b4308d8e1dba873%7=
Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637507680849467802%7CUnknown%7C=
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=
%3D%7C1000&sdata=3D6TSHluQTQh2IyoehtQcGCjqxtT2MlJtQycz%2FCHVno74%3D&reserve=
d=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Yaakov,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Great work. One suggestion.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">If we divide the end-to-end delay budget to per-hop budgets, and =
carry them in SR header, we can mimic using the end-to-end absolute deadlin=
e. One thing we need to do is, when the
 actual time used in a hop is less than the budget of this hop, you can add=
 the remaining budget to the budget of next hop. In this case, you can save=
 a lot of bits used for time, and you don&#8217;t have to rely on accurate =
time sync.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Bryan (Bingyang Liu)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> detnet [mailto:detnet-bounces@ietf.org]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, March 8, 2021 1:37 PM<br>
<b>To:</b> Haoyu Song &lt;haoyu.song@futurewei.com&gt;; detnet@ietf.org; sp=
ring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I think we are in agreement.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I do not see the need for expli=
citly handling the case of a packet missing a LOCAL deadline,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">since the following switches wi=
ll already handle this case optimally (and may still meet the overall budge=
t).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Counting packets that miss thei=
r delay budget is indeed important,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and a counter could be configur=
ed in the egress router for this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">We&#8217;ll need to define this=
 when we get to the protocol specification.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It would be advantageous to put=
 a threshold on the failure rate<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and feed this back to the path/=
stack optimizer.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoy=
u.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Yaakov,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Some feedback inline. <o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@r=
ad.com</a>&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll address your points:=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; The use of clock time as d=
eadline requires network synchronization<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">That is a basic assumption of T=
SN networks (IMO the defining assumption).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">However, the sync needn&#8217;t=
 be highly accurate &#8211; it depends on the tightness of the delay budget=
s.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; Yes, I understand it. =
What I mean is that the method mentioned in the draft seems to be also appl=
icable to other types of networks. For example, we can envision some time-c=
ritical traffic in DCN or WAN. If a protocol
 would be developed, can it also serve the other networks? If so, it would =
be better.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; accurate measurement of pe=
r-link propagation time<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes, I am assuming that once an=
 for all someone does a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measur=
ement of the links, and these are stored in some database.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Once again, the required accura=
cy depends on the delay budgets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; which can somehow limit th=
e application scope of this work<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If the delay budget only above =
the physically minimal delay by say less than 100 microseconds,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I agree that the previous two i=
ssues MUST be carried out. But in such cases there is no alternative.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If the delay budget is much hig=
her than that, then one could use an RSVP-like mechanism,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">sending a packet (or several pa=
ckets) from source to destination collecting a stack of timestamps,<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and then using that stack for t=
he following packets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; Mechanism should be provis=
ioned to track where the timing requirement is violated and by how much<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll leave the OAM for la=
ter. However there are already many high accuracy performance measurement t=
echniques and protocols for this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; For this I mean someth=
ing recorded in the same packet with the deadlines. If it misses the deadli=
ne, the receiver may need to know where it&#8217;s violated. Other independ=
ent methods are possible, but it&#8217;s better to consider
 if it can be integrated in the current proposal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; Recently programmable sche=
duler research has proposed several primitives<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes, I tried to stress that thi=
s ID is not limited to EDF (although sometimes that is a good strategy).<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">One can even reproduce Qbv beha=
vior using a stack of deadlines (although why would one wish to do so?).<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; such as PIPO and PIEO<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ve heard of PIFO (Push =
In First out) but not PIPO. Is this a typo or something new?<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I agree that there are mechanis=
ms that are optimized for hardware, but I have come up with a very nice har=
dware implementation for PEDF<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and prefer to find hardware imp=
lementations for optimal schedulers, rather than to determine schedulers ba=
sed on optimal hardware.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; Sorry that&#8217;s a t=
ypo. I mean PIFO (although we do have a paper under review using the name P=
IPO). Yes I agree those are just abstract primitives. The actual implementa=
tion, if customized to a particular algorithm, would
 be simpler. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoy=
u.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font-family:&quot;Arial&qu=
ot;,sans-serif;color:#212121">CAUTION:</span></b><span lang=3D"EN-US" style=
=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:#212121"=
> External sender. Do not click links or open attachments unless
 you know the content is safe. </span><span lang=3D"EN-US"><o:p></o:p></spa=
n></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:white">Hi Yaakov=
,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Just got a chance to read your =
draft. I agree with the comments of the others that this is a very interest=
ing work. I&#8217;ll just add a few points.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The use of clock time a=
s deadline requires network synchronization, and accurate measurement of pe=
r-link propagation time, which can somehow limit the application scope of t=
his work. Alternatively, one can simply
 budget a device latency which require a router/switch to obey. In case the=
 overall budget is evenly divided by the hops, a single parameter is enough=
. Of course, if one wants to customize the budget on each hop (which might =
be necessary considering the different
 capability/capacity of each hop), a stack is still needed. <o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Mechanism should be pro=
visioned to track where the timing requirement is violated and by how much =
(e.g., using timestamp or flag). This would be very useful for troubleshoot=
ing.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Recently programmable s=
cheduler research has proposed several primitives such as PIPO and PIEO and=
 provided feasible hardware implementations. The scheme proposed in this dr=
aft can easily fit into these primitives.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">All, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I would like to call your atten=
tion to a new ID
<a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C=
01%7Cyaakov_s%40rad.com%7Ccf886b3eaea04f141b4308d8e1dba873%7Cf9047108cc2c4e=
4897a343fad1b3bf9d%7C1%7C0%7C637507680849467802%7CUnknown%7CTWFpbGZsb3d8eyJ=
WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;=
sdata=3D6TSHluQTQh2IyoehtQcGCjqxtT2MlJtQycz%2FCHVno74%3D&amp;reserved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">which describes using a stack-b=
ased approach (similar to segment routing) to time sensitive networking.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It furthermore proposes combini=
ng segment routing with this approach to TSN<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">resulting in a unified approach=
 to forwarding and scheduling.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft is information at thi=
s point, since it discusses the concepts and does not yet pin down the prec=
ise formats.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Apologies for simultaneously se=
nding to 3 lists,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">but I am not sure which WG is t=
he most appropriate for discussions of this topic.<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo6"><span lang=3D"EN-=
US">DetNet is most relevant since the whole point is to control end-to-end =
latency of a time-sensitive flow.<o:p></o:p></span></li><li class=3D"MsoNor=
mal" style=3D"mso-list:l2 level1 lfo6"><span lang=3D"EN-US">Spring is also =
directly relevant due to the use of a stack in the header and the combined =
approach just mentioned.<o:p></o:p></span></li><li class=3D"MsoNormal" styl=
e=3D"mso-list:l2 level1 lfo6"><span lang=3D"EN-US">PCE is relevant to the c=
ase of a central server jointly computing an optimal path and local deadlin=
e stack.<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll let the chairs decid=
e where discussions should be held.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
</body>
</html>

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From: Yaakov Stein <yaakov_s@rad.com>
To: "Liubingyang (Bryan)" <liubingyang@huawei.com>, Haoyu Song <haoyu.song@futurewei.com>, "detnet@ietf.org" <detnet@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Date: Mon, 8 Mar 2021 13:37:55 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/mIAsZpIREi50RWaIymlNF0MQyZg>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Bryan

The local deadlines are specified in absolute time - not deltas.
So there is no need to add the time saved - it is already there!

As I previously replied, the accuracy of the time sync depends on the tight=
ness of the budget.
It has nothing to do with the encoding.

Y(J)S

From: Liubingyang (Bryan) <liubingyang@huawei.com>
Sent: 08/03/2021 14:55
To: Yaakov Stein <yaakov_s@rad.com>; Haoyu Song <haoyu.song@futurewei.com>;=
 detnet@ietf.org; spring@ietf.org; pce@ietf.org
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Great work. One suggestion.
If we divide the end-to-end delay budget to per-hop budgets, and carry them=
 in SR header, we can mimic using the end-to-end absolute deadline. One thi=
ng we need to do is, when the actual time used in a hop is less than the bu=
dget of this hop, you can add the remaining budget to the budget of next ho=
p. In this case, you can save a lot of bits used for time, and you don't ha=
ve to rely on accurate time sync.

Bryan (Bingyang Liu)

From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, March 8, 2021 1:37 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We'll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Cyaakov_s%40rad.com%7C71c93afad8614e5d212e08d8e23156c8%7=
Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637508048843821932%7CUnknown%7C=
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=
%3D%7C1000&sdata=3DJ5d%2Bz%2BmTnTm3C7%2FfD0YSo%2FXMk%2F67YxHlYVRfvv%2Fthcg%=
3D&reserved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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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"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">Bryan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">The local deadlines are specified in absolute time &#=
8211; not deltas.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">So there is no need to add the time saved &#8211; it =
is already there!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">As I previously replied, the accuracy of the time syn=
c depends on the tightness of the budget.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">It has nothing to do with the encoding.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">Y(J)S</span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Liubingyang (Bryan) &lt;liubingyang@hua=
wei.com&gt; <br>
<b>Sent:</b> 08/03/2021 14:55<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; Haoyu Song &lt;haoyu.song=
@futurewei.com&gt;; detnet@ietf.org; spring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">Hi Yaakov,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">Great work. One suggestion.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">If we divide the end-to-end delay budget to per-hop b=
udgets, and carry them in SR header, we can mimic using the end-to-end abso=
lute deadline. One thing we need to
 do is, when the actual time used in a hop is less than the budget of this =
hop, you can add the remaining budget to the budget of next hop. In this ca=
se, you can save a lot of bits used for time, and you don&#8217;t have to r=
ely on accurate time sync.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN">Bryan (Bingyang Liu)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> detnet [<a href=3D"ma=
ilto:detnet-bounces@ietf.org">mailto:detnet-bounces@ietf.org</a>]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, March 8, 2021 1:37 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Haoyu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I think w=
e are in agreement.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I do not =
see the need for explicitly handling the case of a packet missing a LOCAL d=
eadline,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">since the=
 following switches will already handle this case optimally (and may still =
meet the overall budget).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Counting =
packets that miss their delay budget is indeed important,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">and a cou=
nter could be configured in the egress router for this.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">We&#8217;=
ll need to define this when we get to the protocol specification.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">It would =
be advantageous to put a threshold on the failure rate<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">and feed =
this back to the path/stack optimizer.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Y(J)S<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> Haoyu Song &lt;<a hre=
f=3D"mailto:haoyu.song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Hi Yaakov=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Some feed=
back inline.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Best rega=
rds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Haoyu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> Yaakov Stein &lt;<a h=
ref=3D"mailto:yaakov_s@rad.com">yaakov_s@rad.com</a>&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Haoyu, <o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I&#8217;l=
l address your points:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; The =
use of clock time as deadline requires network synchronization<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">That is a=
 basic assumption of TSN networks (IMO the defining assumption).<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">However, =
the sync needn&#8217;t be highly accurate &#8211; it depends on the tightne=
ss of the delay budgets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt;&gt; =
Yes, I understand it. What I mean is that the method mentioned in the draft=
 seems to be also applicable to other types of networks. For example, we ca=
n envision some time-critical traffic in DCN
 or WAN. If a protocol would be developed, can it also serve the other netw=
orks? If so, it would be better.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; accu=
rate measurement of per-link propagation time<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Yes, I am=
 assuming that once an for all someone does a TDR or at least OWAMP/TWAMP/Y=
.1731-1wD delay measurement of the links, and these are stored in some data=
base.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Once agai=
n, the required accuracy depends on the delay budgets.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; whic=
h can somehow limit the application scope of this work<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">If the de=
lay budget only above the physically minimal delay by say less than 100 mic=
roseconds,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I agree t=
hat the previous two issues MUST be carried out. But in such cases there is=
 no alternative.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">If the de=
lay budget is much higher than that, then one could use an RSVP-like mechan=
ism,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">sending a=
 packet (or several packets) from source to destination collecting a stack =
of timestamps,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">and then =
using that stack for the following packets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; Mech=
anism should be provisioned to track where the timing requirement is violat=
ed and by how much<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I&#8217;l=
l leave the OAM for later. However there are already many high accuracy per=
formance measurement techniques and protocols for this.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt;&gt; =
For this I mean something recorded in the same packet with the deadlines. I=
f it misses the deadline, the receiver may need to know where it&#8217;s vi=
olated. Other independent methods are possible,
 but it&#8217;s better to consider if it can be integrated in the current p=
roposal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; Rece=
ntly programmable scheduler research has proposed several primitives<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Yes, I tr=
ied to stress that this ID is not limited to EDF (although sometimes that i=
s a good strategy).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">One can e=
ven reproduce Qbv behavior using a stack of deadlines (although why would o=
ne wish to do so?).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt; such=
 as PIPO and PIEO<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I&#8217;v=
e heard of PIFO (Push In First out) but not PIPO. Is this a typo or somethi=
ng new?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I agree t=
hat there are mechanisms that are optimized for hardware, but I have come u=
p with a very nice hardware implementation for PEDF<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">and prefe=
r to find hardware implementations for optimal schedulers, rather than to d=
etermine schedulers based on optimal hardware.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&gt;&gt; =
Sorry that&#8217;s a typo. I mean PIFO (although we do have a paper under r=
eview using the name PIPO). Yes I agree those are just abstract primitives.=
 The actual implementation, if customized to a particular
 algorithm, would be simpler. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Y(J)S<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> Haoyu Song &lt;<a hre=
f=3D"mailto:haoyu.song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white;mso-fareast-language:ZH-C=
N">Hi Yaakov,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Just got =
a chance to read your draft. I agree with the comments of the others that t=
his is a very interesting work. I&#8217;ll just add a few points.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2"><span style=3D"ms=
o-fareast-language:ZH-CN">The use of clock time as deadline requires networ=
k synchronization, and accurate measurement of per-link propagation time, w=
hich can somehow limit the application
 scope of this work. Alternatively, one can simply budget a device latency =
which require a router/switch to obey. In case the overall budget is evenly=
 divided by the hops, a single parameter is enough. Of course, if one wants=
 to customize the budget on each
 hop (which might be necessary considering the different capability/capacit=
y of each hop), a stack is still needed.
<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"mso-list:l0 level1 =
lfo2"><span style=3D"mso-fareast-language:ZH-CN">Mechanism should be provis=
ioned to track where the timing requirement is violated and by how much (e.=
g., using timestamp or flag). This would be very useful for troubleshooting=
.<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"mso-list:l0 level1=
 lfo2"><span style=3D"mso-fareast-language:ZH-CN">Recently programmable sch=
eduler research has proposed several primitives such as PIPO and PIEO and p=
rovided feasible hardware implementations. The scheme proposed
 in this draft can easily fit into these primitives.<o:p></o:p></span></li>=
</ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Best rega=
rds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Haoyu<o:p=
></o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> spring &lt;<a href=3D=
"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">All, <o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I would l=
ike to call your attention to a new ID
<a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C=
01%7Cyaakov_s%40rad.com%7C71c93afad8614e5d212e08d8e23156c8%7Cf9047108cc2c4e=
4897a343fad1b3bf9d%7C1%7C0%7C637508048843821932%7CUnknown%7CTWFpbGZsb3d8eyJ=
WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;=
sdata=3DJ5d%2Bz%2BmTnTm3C7%2FfD0YSo%2FXMk%2F67YxHlYVRfvv%2Fthcg%3D&amp;rese=
rved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">which des=
cribes using a stack-based approach (similar to segment routing) to time se=
nsitive networking.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">It furthe=
rmore proposes combining segment routing with this approach to TSN<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">resulting=
 in a unified approach to forwarding and scheduling.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">The draft=
 is information at this point, since it discusses the concepts and does not=
 yet pin down the precise formats.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Apologies=
 for simultaneously sending to 3 lists,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">but I am =
not sure which WG is the most appropriate for discussions of this topic.<o:=
p></o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo5"><span style=3D"ms=
o-fareast-language:ZH-CN">DetNet is most relevant since the whole point is =
to control end-to-end latency of a time-sensitive flow.<o:p></o:p></span></=
li><li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo5"><span style=3D=
"mso-fareast-language:ZH-CN">Spring is also directly relevant due to the us=
e of a stack in the header and the combined approach just mentioned.<o:p></=
o:p></span></li><li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo5"><=
span style=3D"mso-fareast-language:ZH-CN">PCE is relevant to the case of a =
central server jointly computing an optimal path and local deadline stack.<=
o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">I&#8217;l=
l let the chairs decide where discussions should be held.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Y(J)S<o:p=
></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
</div>
</body>
</html>

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From: "Liubingyang (Bryan)" <liubingyang@huawei.com>
To: Yaakov Stein <yaakov_s@rad.com>, Haoyu Song <haoyu.song@futurewei.com>, detnet <detnet@ietf.org>, spring <spring@ietf.org>, pce <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Subject: Re: [spring] new draft on segment routing approach to TSN
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Some advantages.
If you use budget instead of deadline, you don't need accurate time sync.
If you use budget, the time budget encoded in packet require fewer bits tha=
n using absolute time.


The tightness is related to whether and how many flows can be admitted. It =
is related to network resource utilization and revenue.


If e2e deadline is 1ms, then time sync with 1ms accuracy will not work well=
. Using budget helps resolve this problem.

Just my two cents.

Bryan




From:Yaakov Stein <yaakov_s@rad.com>
To:Liubingyang (Bryan) <liubingyang@huawei.com>;Haoyu Song <haoyu.song@futu=
rewei.com>;detnet <detnet@ietf.org>;spring <spring@ietf.org>;pce <pce@ietf.=
org>
Date:2021-03-08 21:38:20
Subject:RE: new draft on segment routing approach to TSN

Bryan

The local deadlines are specified in absolute time =96 not deltas.
So there is no need to add the time saved =96 it is already there!

As I previously replied, the accuracy of the time sync depends on the tight=
ness of the budget.
It has nothing to do with the encoding.

Y(J)S

From: Liubingyang (Bryan) <liubingyang@huawei.com>
Sent: 08/03/2021 14:55
To: Yaakov Stein <yaakov_s@rad.com>; Haoyu Song <haoyu.song@futurewei.com>;=
 detnet@ietf.org; spring@ietf.org; pce@ietf.org
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Great work. One suggestion.
If we divide the end-to-end delay budget to per-hop budgets, and carry them=
 in SR header, we can mimic using the end-to-end absolute deadline. One thi=
ng we need to do is, when the actual time used in a hop is less than the bu=
dget of this hop, you can add the remaining budget to the budget of next ho=
p. In this case, you can save a lot of bits used for time, and you don=92t =
have to rely on accurate time sync.

Bryan (Bingyang Liu)

From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, March 8, 2021 1:37 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We=92ll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I=92ll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn=92t be highly accurate =96 it depends on the tightn=
ess of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I=92ll leave the OAM for later. However there are already many high accurac=
y performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it=92s vio=
lated. Other independent methods are possible, but it=92s better to conside=
r if it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I=92ve heard of PIFO (Push In First out) but not PIPO. Is this a typo or so=
mething new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that=92s a typo. I mean PIFO (although we do have a paper under re=
view using the name PIPO). Yes I agree those are just abstract primitives. =
The actual implementation, if customized to a particular algorithm, would b=
e simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN



CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.

Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I=92ll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://eur01.safelinks.protection.outlook.co=
m/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.t=
xt&data=3D04%7C01%7Cyaakov_s%40rad.com%7C71c93afad8614e5d212e08d8e23156c8%7=
Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637508048843821932%7CUnknown%7C=
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=
%3D%7C1000&sdata=3DJ5d%2Bz%2BmTnTm3C7%2FfD0YSo%2FXMk%2F67YxHlYVRfvv%2Fthcg%=
3D&reserved=3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I=92ll let the chairs decide where discussions should be held.

Y(J)S


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<div>
<div id=3D"focus">
<div>Some advantages.&nbsp; </div>
<div>If you use budget instead of deadline, you don't need accurate time sy=
nc.&nbsp; </div>
<div>If you use budget, the time budget encoded in packet require fewer bit=
s than using absolute time.
</div>
<div><br>
</div>
<div><br>
</div>
<div>The tightness is related to whether and how many flows can be admitted=
. It is related to network resource utilization and revenue.&nbsp;
</div>
<div><br>
</div>
<div><br>
</div>
<div>If e2e deadline is 1ms, then time sync with 1ms accuracy will not work=
 well. Using budget helps resolve this problem.&nbsp;
</div>
<div><br>
</div>
<div>Just my two cents. </div>
<div><br>
Bryan <br>
<br>
</div>
</div>
<p><br>
<br>
</p>
</div>
<div></div>
<div name=3D"AnyOffice-Background-Image" style=3D"border-top:1px solid #B5C=
4DF; padding:8px">
<div style=3D"word-break:break-all"><b>From:</b>Yaakov Stein &lt;yaakov_s@r=
ad.com&gt; </div>
<div style=3D"word-break:break-all"><b>To:</b>Liubingyang (Bryan) &lt;liubi=
ngyang@huawei.com&gt;;Haoyu Song &lt;haoyu.song@futurewei.com&gt;;detnet &l=
t;detnet@ietf.org&gt;;spring &lt;spring@ietf.org&gt;;pce &lt;pce@ietf.org&g=
t;
</div>
<div style=3D"word-break:break-all"><b>Date:</b>2021-03-08 21:38:20 </div>
<div style=3D"word-break:break-all"><b>Subject:</b>RE: new draft on segment=
 routing approach to TSN
</div>
<div><br>
</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">Brya=
n</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">The =
local deadlines are specified in absolute time =96 not deltas.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">So t=
here is no need to add the time saved =96 it is already there!</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">As I=
 previously replied, the accuracy of the time sync depends on the tightness=
 of the budget.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">It h=
as nothing to do with the encoding.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">Y(J)=
S</span></p>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Liubingyang (Bryan) &lt;liubingyang@hua=
wei.com&gt; <br>
<b>Sent:</b> 08/03/2021 14:55<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; Haoyu Song &lt;haoyu.song=
@futurewei.com&gt;; detnet@ietf.org; spring@ietf.org; pce@ietf.org<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">Hi Y=
aakov,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">Grea=
t work. One suggestion.
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">If w=
e divide the end-to-end delay budget to per-hop budgets, and carry them in =
SR header, we can mimic using the end-to-end absolute deadline. One thing w=
e need to do is, when the actual time
 used in a hop is less than the budget of this hop, you can add the remaini=
ng budget to the budget of next hop. In this case, you can save a lot of bi=
ts used for time, and you don=92t have to rely on accurate time sync.
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">Brya=
n (Bingyang Liu)</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; color:#1F497D">&nbs=
p;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"">From:</span></b><span style=3D""=
> detnet [<a href=3D"mailto:detnet-bounces@ietf.org">mailto:detnet-bounces@=
ietf.org</a>]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, March 8, 2021 1:37 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN</=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Haoyu</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">I think we are in agreement.</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">I do not see the need for explicitl=
y handling the case of a packet missing a LOCAL deadline,</span></p>
<p class=3D"MsoNormal"><span style=3D"">since the following switches will a=
lready handle this case optimally (and may still meet the overall budget).<=
/span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Counting packets that miss their de=
lay budget is indeed important,
</span></p>
<p class=3D"MsoNormal"><span style=3D"">and a counter could be configured i=
n the egress router for this.</span></p>
<p class=3D"MsoNormal"><span style=3D"">We=92ll need to define this when we=
 get to the protocol specification.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">It would be advantageous to put a t=
hreshold on the failure rate</span></p>
<p class=3D"MsoNormal"><span style=3D"">and feed this back to the path/stac=
k optimizer.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Y(J)S</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"">From:</span></b><span style=3D""=
> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu.song@fut=
urewei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Hi Yaakov,</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Some feedback inline. </span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Best regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"">Haoyu</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"">From:</span></b><span style=3D""=
> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@rad.com</a>=
&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Haoyu, </span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">I=92ll address your points:</span><=
/p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; The use of clock time as deadl=
ine requires network synchronization</span></p>
<p class=3D"MsoNormal"><span style=3D"">That is a basic assumption of TSN n=
etworks (IMO the defining assumption).</span></p>
<p class=3D"MsoNormal"><span style=3D"">However, the sync needn=92t be high=
ly accurate =96 it depends on the tightness of the delay budgets.</span></p=
>
<p class=3D"MsoNormal"><span style=3D"">&gt;&gt; Yes, I understand it. What=
 I mean is that the method mentioned in the draft seems to be also applicab=
le to other types of networks. For example, we can envision some time-criti=
cal traffic in DCN or WAN. If a protocol would
 be developed, can it also serve the other networks? If so, it would be bet=
ter. </span>
</p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; accurate measurement of per-li=
nk propagation time</span></p>
<p class=3D"MsoNormal"><span style=3D"">Yes, I am assuming that once an for=
 all someone does a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measuremen=
t of the links, and these are stored in some database.</span></p>
<p class=3D"MsoNormal"><span style=3D"">Once again, the required accuracy d=
epends on the delay budgets.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; which can somehow limit the ap=
plication scope of this work</span></p>
<p class=3D"MsoNormal"><span style=3D"">If the delay budget only above the =
physically minimal delay by say less than 100 microseconds,
</span></p>
<p class=3D"MsoNormal"><span style=3D"">I agree that the previous two issue=
s MUST be carried out. But in such cases there is no alternative.</span></p=
>
<p class=3D"MsoNormal"><span style=3D"">If the delay budget is much higher =
than that, then one could use an RSVP-like mechanism,</span></p>
<p class=3D"MsoNormal"><span style=3D"">sending a packet (or several packet=
s) from source to destination collecting a stack of timestamps,</span></p>
<p class=3D"MsoNormal"><span style=3D"">and then using that stack for the f=
ollowing packets.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; Mechanism should be provisione=
d to track where the timing requirement is violated and by how much</span><=
/p>
<p class=3D"MsoNormal"><span style=3D"">I=92ll leave the OAM for later. How=
ever there are already many high accuracy performance measurement technique=
s and protocols for this.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt;&gt; For this I mean something =
recorded in the same packet with the deadlines. If it misses the deadline, =
the receiver may need to know where it=92s violated. Other independent meth=
ods are possible, but it=92s better to consider
 if it can be integrated in the current proposal.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; Recently programmable schedule=
r research has proposed several primitives</span></p>
<p class=3D"MsoNormal"><span style=3D"">Yes, I tried to stress that this ID=
 is not limited to EDF (although sometimes that is a good strategy).</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"">One can even reproduce Qbv behavior=
 using a stack of deadlines (although why would one wish to do so?).</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt; such as PIPO and PIEO</span></=
p>
<p class=3D"MsoNormal"><span style=3D"">I=92ve heard of PIFO (Push In First=
 out) but not PIPO. Is this a typo or something new?</span></p>
<p class=3D"MsoNormal"><span style=3D"">I agree that there are mechanisms t=
hat are optimized for hardware, but I have come up with a very nice hardwar=
e implementation for PEDF</span></p>
<p class=3D"MsoNormal"><span style=3D"">and prefer to find hardware impleme=
ntations for optimal schedulers, rather than to determine schedulers based =
on optimal hardware.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&gt;&gt; Sorry that=92s a typo. I m=
ean PIFO (although we do have a paper under review using the name PIPO). Ye=
s I agree those are just abstract primitives. The actual implementation, if=
 customized to a particular algorithm, would
 be simpler. </span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Y(J)S</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"">From:</span></b><span style=3D""=
> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu.song@fut=
urewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555; padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%; background:#FFE599; padding:5.25p=
t 3.75pt 5.25pt 11.25pt">
<div>
<p style=3D""><b><span style=3D"font-size:9.0pt; font-family:&quot;Arial&qu=
ot;,sans-serif; color:#212121">CAUTION:</span></b><span style=3D"font-size:=
9.0pt; font-family:&quot;Arial&quot;,sans-serif; color:#212121"> External s=
ender. Do not click links or open attachments unless you know
 the content is safe. </span></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov,</span><span s=
tyle=3D""></span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Just got a chance to read your draf=
t. I agree with the comments of the others that this is a very interesting =
work. I=92ll just add a few points.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<ol start=3D"1" type=3D"1" style=3D"margin-top:0in">
<li class=3D"MsoNormal" style=3D""><span style=3D"">The use of clock time a=
s deadline requires network synchronization, and accurate measurement of pe=
r-link propagation time, which can somehow limit the application scope of t=
his work. Alternatively, one can simply
 budget a device latency which require a router/switch to obey. In case the=
 overall budget is evenly divided by the hops, a single parameter is enough=
. Of course, if one wants to customize the budget on each hop (which might =
be necessary considering the different
 capability/capacity of each hop), a stack is still needed. </span></li><li=
 class=3D"MsoNormal" style=3D""><span style=3D"">Mechanism should be provis=
ioned to track where the timing requirement is violated and by how much (e.=
g., using timestamp or flag). This would be very useful for troubleshooting=
.</span></li><li class=3D"MsoNormal" style=3D""><span style=3D"">Recently p=
rogrammable scheduler research has proposed several primitives such as PIPO=
 and PIEO and provided feasible hardware implementations. The scheme propos=
ed in this draft can easily fit into these primitives.</span></li></ol>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Best regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"">Haoyu</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"">From:</span></b><span style=3D""=
> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf=
.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN</span=
></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">All, </span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">I would like to call your attention=
 to a new ID
<a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C=
01%7Cyaakov_s%40rad.com%7C71c93afad8614e5d212e08d8e23156c8%7Cf9047108cc2c4e=
4897a343fad1b3bf9d%7C1%7C0%7C637508048843821932%7CUnknown%7CTWFpbGZsb3d8eyJ=
WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;=
sdata=3DJ5d%2Bz%2BmTnTm3C7%2FfD0YSo%2FXMk%2F67YxHlYVRfvv%2Fthcg%3D&amp;rese=
rved=3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> </span></p>
<p class=3D"MsoNormal"><span style=3D"">which describes using a stack-based=
 approach (similar to segment routing) to time sensitive networking.</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"">It furthermore proposes combining s=
egment routing with this approach to TSN</span></p>
<p class=3D"MsoNormal"><span style=3D"">resulting in a unified approach to =
forwarding and scheduling.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">The draft is information at this po=
int, since it discusses the concepts and does not yet pin down the precise =
formats.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Apologies for simultaneously sendin=
g to 3 lists,
</span></p>
<p class=3D"MsoNormal"><span style=3D"">but I am not sure which WG is the m=
ost appropriate for discussions of this topic.</span></p>
<ul type=3D"disc" style=3D"margin-top:0in">
<li class=3D"MsoNormal" style=3D""><span style=3D"">DetNet is most relevant=
 since the whole point is to control end-to-end latency of a time-sensitive=
 flow.</span></li><li class=3D"MsoNormal" style=3D""><span style=3D"">Sprin=
g is also directly relevant due to the use of a stack in the header and the=
 combined approach just mentioned.</span></li><li class=3D"MsoNormal" style=
=3D""><span style=3D"">PCE is relevant to the case of a central server join=
tly computing an optimal path and local deadline stack.</span></li></ul>
<p class=3D"MsoNormal"><span style=3D"">I=92ll let the chairs decide where =
discussions should be held.</span></p>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"">Y(J)S</span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"">&nbsp;</span></p>
</div>
</div>
</div>
</body>
</html>

--_000_F09AC6CEAECC4EC0B0FA34EB7844EDE2_--


From nobody Mon Mar  8 08:36:41 2021
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Date: Mon, 8 Mar 2021 17:36:23 +0100
From: Toerless Eckert <tte@cs.fau.de>
To: Yaakov Stein <yaakov_s@rad.com>
Cc: "detnet@ietf.org" <detnet@ietf.org>, Haoyu Song <haoyu.song@futurewei.com>, "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
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Subject: [spring] PEDF / PIFO / ... (was: Re: [Detnet] new draft on segment routing approach to TSN)
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> Yaakov wrote:
> I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or something new?
> I agree that there are mechanisms that are optimized for hardware, but I have come up with a very nice hardware implementation for PEDF  and prefer to find hardware implementations for optimal schedulers, rather than to determine schedulers based on optimal hardware.

PEDF ?

There was a long debate in the congestion control technology in TSV about the scalability
issues of flow-aware AQM mechanisms and AFAIK, ultimately, the AQM mechanisms that won out
where the ones that did not require this (such as PIE).  We also had round 1 of
deterministic services (if i may call them that) using rfc2212 with RSVP fail because
of real or assumed infeasibility to scale on multiple dimensions. IMHO it actually
failed also because of assumed infeasibility becasue there was no good analysis and
documentation of what actually could be made to work (badmouthing...).

>From this experience i can only recommend to make sure that we do understand what and
how something is feasible to be implemented a what scale and speed. 

For example, i am not aware to have seen general purpose EDF hardware at scale. But
i am very interested for any pointers. On the research side, this one is the
oldest one for PIFO i know:

http://web.mit.edu/pifo/pifo-sigcomm.pdf

[ i am of course mentioning PIFO because by using deadline as the PIFO rank, one has
  a simple approach to implement EDF].

In this work, if i remember my analysis correctly, the scale still depends on the
number of flows and the ability to identify packets to flows (need to read it again though).

This _may_ be acceptable in specific use-cases but should IMHO be well understood
and documented, especially when the view from the outside is that by using e.g.: SR
packet headers it is "looking" as if there is really no per-flow scaling aspect to
the hardware requiremens. After all, the idea of source routing with SR and having the
state in the packet is to eliminate the need to have) and scale it in the router.

Cheers
    Toerless

> >> Sorry that's a typo. I mean PIFO (although we do have a paper under review using the name PIPO). Yes I agree those are just abstract primitives. The actual implementation, if customized to a particular algorithm, would be simpler.
> 
> Y(J)S
> 
> From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>
> Sent: 05/03/2021 22:46
> To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
> Subject: RE: new draft on segment routing approach to TSN
> 
> 
> CAUTION: External sender. Do not click links or open attachments unless you know the content is safe.
> Hi Yaakov,
> 
> Just got a chance to read your draft. I agree with the comments of the others that this is a very interesting work. I'll just add a few points.
> 
> 
>   1.  The use of clock time as deadline requires network synchronization, and accurate measurement of per-link propagation time, which can somehow limit the application scope of this work. Alternatively, one can simply budget a device latency which require a router/switch to obey. In case the overall budget is evenly divided by the hops, a single parameter is enough. Of course, if one wants to customize the budget on each hop (which might be necessary considering the different capability/capacity of each hop), a stack is still needed.
>   2.  Mechanism should be provisioned to track where the timing requirement is violated and by how much (e.g., using timestamp or flag). This would be very useful for troubleshooting.
>   3.  Recently programmable scheduler research has proposed several primitives such as PIPO and PIEO and provided feasible hardware implementations. The scheme proposed in this draft can easily fit into these primitives.
> 
> Best regards,
> Haoyu
> From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On Behalf Of Yaakov Stein
> Sent: Tuesday, February 23, 2021 5:14 AM
> To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
> Subject: [spring] new draft on segment routing approach to TSN
> 
> All,
> 
> I would like to call your attention to a new ID https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&data=04%7C01%7Chaoyu.song%40futurewei.com%7C6aeaab604ad842c5ca0f08d8e122721c%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637506885364131187%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ZHZdFoS63OmpW1tEcp9BBksGzRGfs8IF9NpJnS%2FlXa8%3D&reserved=0>
> which describes using a stack-based approach (similar to segment routing) to time sensitive networking.
> It furthermore proposes combining segment routing with this approach to TSN
> resulting in a unified approach to forwarding and scheduling.
> 
> The draft is information at this point, since it discusses the concepts and does not yet pin down the precise formats.
> 
> Apologies for simultaneously sending to 3 lists,
> but I am not sure which WG is the most appropriate for discussions of this topic.
> 
>   *   DetNet is most relevant since the whole point is to control end-to-end latency of a time-sensitive flow.
>   *   Spring is also directly relevant due to the use of a stack in the header and the combined approach just mentioned.
>   *   PCE is relevant to the case of a central server jointly computing an optimal path and local deadline stack.
> I'll let the chairs decide where discussions should be held.
> 
> Y(J)S
> 

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


-- 
---
tte@cs.fau.de


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From: Rishabh Parekh <rishabhp@gmail.com>
Date: Mon, 8 Mar 2021 09:46:55 -0800
Message-ID: <CABjMoXY3Z1HCUw3D8PMVE-S-=nyma+N0dY0N8mUdeXigGYyGRw@mail.gmail.com>
To: Ron Bonica <rbonica@juniper.net>
Cc: Weiqiang Cheng <chengweiqiang@chinamobile.com>, "srcomp@ietf.org" <srcomp@ietf.org>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] [Srcomp]  New drafts from SRCOMP design team
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Ron,
SRv6 Replication SID does not need to follow IPv6 multicast address format
since it is an IPv6 unicast address like any other SRv6 SID.

-Rishabh

On Tue, Mar 2, 2021 at 9:09 AM Ron Bonica <rbonica@juniper.net> wrote:

> Rishabh,
>
>
>
> Is Section 2 of the SR replication segment draft compliant with Section
> 2.7 of RFC 4291? Could it be brought into compliance by using the high
> order 16 bits that RFC 4291 recommends?
>
>
>
>
>                                                                          =
  Ron
>
>
>
>
>
>
>
> Juniper Business Use Only
>
> *From:* Srcomp <srcomp-bounces@ietf.org> *On Behalf Of *Weiqiang Cheng
> *Sent:* Tuesday, March 2, 2021 12:28 AM
> *To:* 'Rishabh Parekh' <rishabhp@gmail.com>
> *Cc:* srcomp@ietf.org; 'SPRING WG List' <spring@ietf.org>
> *Subject:* Re: [Srcomp] [spring] New drafts from SRCOMP design team
>
>
>
> *[External Email. Be cautious of content]*
>
>
>
> Hi Rishabh,
>
> Thanks for your comments.
>
> It is good point, and DT will consider the it in.
>
>
>
> B.R.
>
> Weiqiang Cheng
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* spring [mailto:spring-bounces@ietf.org <=
spring-bounces@ietf.org>]
> *=E4=BB=A3=E8=A1=A8 *Rishabh Parekh
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2021=E5=B9=B42=E6=9C=8827=E6=97=
=A5 01:50
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Weiqiang Cheng
> *=E6=8A=84=E9=80=81:* srcomp@ietf.org; SPRING WG List
> *=E4=B8=BB=E9=A2=98:* Re: [spring] New drafts from SRCOMP design team
>
>
>
> Weiqiang,
>
> Text quoted below from the SPRING charter indirectly covers
> Point-to-Multipoint requirement which is addressed by SR Replication
> Segment draft
> https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication-segment=
/
> <https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-s=
pring-sr-replication-segment/__;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz0o9WjgWa=
U6W5fQ7MthNrQdg-dWAsLJnab_Ce0i_WdUG$>
>
> New types of segments mapping to forwarding behaviour (e.g., local
>
> ingress replication, local forwarding resources, a pre-existing
>
> replication structure) if needed for new usages.
>
> For the Point-to-Multipoint compression requirement, what exactly is
> "multicast address" in the Metric? Is this an IPv6 multicast address? If
> so, it really does not conform to SRv6 data plane.
>
>
>
> I would rather consider the SRv6 Replication SID, described in the latest
> version of SR Replication segment draft, to be the Metric for measuring
> P2MP requirement. Maybe we should also consider adding it to SRv6
> Functionality Section 4.2.1 of the compression requirements draft.
>
>
>
> -Rishabh
>
>
>
>
>
> On Thu, Feb 25, 2021 at 9:25 AM Weiqiang Cheng <
> chengweiqiang@chinamobile.com> wrote:
>
> Hi All,
>
> Two drafts have been submitted.  Please review them and any comments are
> welcomed.
>
>
>
> Compression requirement draft -04 version provided two more requirements:
>
>
> https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-require=
ment-04.txt
> <https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-srcompd=
t-spring-compression-requirement-04.txt__;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixq=
Ez0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce1UWnkzI$>
>
>
>
> Compression analysis draft -00 provided a skeleton for the analysis of 4
> candidate proposals.
>
>
> https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-analysi=
s-00.txt
> <https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-srcompd=
t-spring-compression-analysis-00.txt__;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz0=
o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce4mNqDYS$>
>
>
>
> B.R.
>
> Weiqiang
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spring_=
_;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce6G=
Liq7Z$>
>
>

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<div dir=3D"ltr"><div>Ron,</div><div>SRv6 Replication SID does not need to =
follow IPv6 multicast address format since it is an IPv6 unicast address li=
ke any other SRv6 SID.</div><div><br></div><div>-Rishabh<br></div></div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, M=
ar 2, 2021 at 9:09 AM Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net"=
>rbonica@juniper.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">





<div style=3D"overflow-wrap: break-word;" lang=3D"EN-US">
<div class=3D"gmail-m_-2331915553511110695WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Rishabh,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Is Section 2 of the SR replication segment draft comp=
liant with Section 2.7 of RFC 4291? Could it be brought into compliance by =
using the high order 16 bits that RFC 4291 recommends?<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"gmail-m_-2331915553511110695msipfooter30b3d538" style=3D"margin=
:0in;text-align:center" align=3D"center">
<span style=3D"font-size:7pt;color:black">Juniper Business Use Only</span><=
u></u><u></u></p>
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;C=
alibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"> Srcomp &lt;<a href=3D"mailto:srcom=
p-bounces@ietf.org" target=3D"_blank">srcomp-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Weiqiang Cheng<br>
<b>Sent:</b> Tuesday, March 2, 2021 12:28 AM<br>
<b>To:</b> &#39;Rishabh Parekh&#39; &lt;<a href=3D"mailto:rishabhp@gmail.co=
m" target=3D"_blank">rishabhp@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:srcomp@ietf.org" target=3D"_blank">srcomp@ietf=
.org</a>; &#39;SPRING WG List&#39; &lt;<a href=3D"mailto:spring@ietf.org" t=
arget=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Srcomp] [spring] New drafts from SRCOMP design team<u>=
</u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal" style=3D"line-height:12pt;background:rgb(255,235,156=
) none repeat scroll 0% 0%"><b><span style=3D"font-size:10.5pt;font-family:=
&quot;Lato&quot;,sans-serif;color:black">[External Email. Be cautious of co=
ntent]<u></u><u></u></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Hi Rishabh,<u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Thanks for your comments.<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">It is good point, and DT will =
consider the it in.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">B.R.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Weiqiang Cheng<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p=
>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10pt" lang=3D"ZH-CN">=E5=
=8F=91=E4=BB=B6=E4=BA=BA</span></b><b><span style=3D"font-size:10pt">:</spa=
n></b><span style=3D"font-size:10pt"> spring [<a href=3D"mailto:spring-boun=
ces@ietf.org" target=3D"_blank">mailto:spring-bounces@ietf.org</a>]
<b><span lang=3D"ZH-CN">=E4=BB=A3=E8=A1=A8 </span></b>Rishabh Parekh<br>
<b><span lang=3D"ZH-CN">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span>:</b> 20=
21<span lang=3D"ZH-CN">=E5=B9=B4</span>2<span lang=3D"ZH-CN">=E6=9C=88</spa=
n>27<span lang=3D"ZH-CN">=E6=97=A5</span> 01:50<br>
<b><span lang=3D"ZH-CN">=E6=94=B6=E4=BB=B6=E4=BA=BA</span>:</b> Weiqiang Ch=
eng<br>
<b><span lang=3D"ZH-CN">=E6=8A=84=E9=80=81</span>:</b> <a href=3D"mailto:sr=
comp@ietf.org" target=3D"_blank">srcomp@ietf.org</a>; SPRING WG List<br>
<b><span lang=3D"ZH-CN">=E4=B8=BB=E9=A2=98</span>:</b> Re: [spring] New dra=
fts from SRCOMP design team<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>Weiqiang,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Text quoted below from the SPRING charter indi=
rectly covers Point-to-Multipoint requirement which is addressed by SR Repl=
ication Segment draft
<a href=3D"https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draf=
t-ietf-spring-sr-replication-segment/__;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz=
0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce0i_WdUG$" target=3D"_blank">
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication-segment/<=
/a><u></u><u></u></span></p>
</div>
<div>
<pre><span>New types of segments mapping to forwarding behaviour (e.g., loc=
al<u></u><u></u></span></pre>
<pre><span>ingress replication, local forwarding resources, a pre-existing<=
u></u><u></u></span></pre>
<pre><span>replication structure) if needed for new usages.<u></u><u></u></=
span></pre>
</div>
<div>
<p class=3D"MsoNormal"><span>For the Point-to-Multipoint compression requir=
ement, what exactly is &quot;multicast address&quot; in the Metric? Is this=
 an IPv6 multicast address? If so, it really does not conform to SRv6 data =
plane.
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>I would rather consider the SRv6 Replication S=
ID, described in the latest version of SR Replication segment draft, to be =
the Metric for measuring P2MP requirement. Maybe we should also consider ad=
ding
 it to SRv6 Functionality Section 4.2.1 of the compression requirements dra=
ft.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>-Rishabh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(136,136,136)"><u></u>=C2=A0=
<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Thu, Feb 25, 2021 at 9:25 AM Weiqiang Cheng=
 &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank">che=
ngweiqiang@chinamobile.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span>Hi All,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Two drafts have been submitted.=C2=A0 Please r=
eview them and any comments are welcomed.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Compression requirement draft -04 version prov=
ided two more requirements:
<u></u><u></u></span></p>
<p><span><a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/archive=
/id/draft-srcompdt-spring-compression-requirement-04.txt__;!!NEt6yMaO-gk!Vj=
URp3oglqwAJJ06ixqEz0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce1UWnkzI$" target=3D"=
_blank">https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-r=
equirement-04.txt</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Compression analysis draft -00 provided a skel=
eton for the analysis of 4 candidate proposals.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span><a href=3D"https://urldefense.com/v3/__https:/=
www.ietf.org/archive/id/draft-srcompdt-spring-compression-analysis-00.txt__=
;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJnab_Ce4mN=
qDYS$" target=3D"_blank">https://www.ietf.org/archive/id/draft-srcompdt-spr=
ing-compression-analysis-00.txt</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>B.R.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Weiqiang<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>______________________________________________=
_<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo=
/spring__;!!NEt6yMaO-gk!VjURp3oglqwAJJ06ixqEz0o9WjgWaU6W5fQ7MthNrQdg-dWAsLJ=
nab_Ce6GLiq7Z$" target=3D"_blank">https://www.ietf.org/mailman/listinfo/spr=
ing</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div>

--000000000000d8505805bd0a05e5--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/s3T9hQHnseN0fCR8ZCpfzsD55hM>
Subject: Re: [spring] PEDF / PIFO / ... (was: Re: [Detnet] new draft on segment routing approach to TSN)
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Toerless

I describe PEDF in the ID. It is a twist on the combination of strict prior=
ity and EDF.

Basically there can be multiple time sensitive flows with different priorit=
ies and non-sensitive traffic as well.
With PEDF one first looks at the TS structure with the highest priority,
however, one doesn't take the packet in the highest priority (like in regul=
ar strict priority),
but rather you check whether its deadline is closer than the maximum packet=
 clock-out time from now.
If not one checks the next highest priority, with full knowledge that one c=
an send another packet and still make it back in time.

This can be extended to WFQ as well.

Using PEDF loosens the requirements on the optimization.
In fact, PEDF and the simple calculation on each flow separately
usually outperforms EDF and a more sophisticated optimization calculation.
(I don't yet have an analytical explanation of this...)

Y(J)S

-----Original Message-----
From: Toerless Eckert <tte@cs.fau.de>=20
Sent: 08/03/2021 18:36
To: Yaakov Stein <yaakov_s@rad.com>
Cc: detnet@ietf.org; Haoyu Song <haoyu.song@futurewei.com>; spring@ietf.org=
; pce@ietf.org
Subject: PEDF / PIFO / ... (was: Re: [Detnet] new draft on segment routing =
approach to TSN)

> Yaakov wrote:
> I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or so=
mething new?
> I agree that there are mechanisms that are optimized for hardware, but I =
have come up with a very nice hardware implementation for PEDF  and prefer =
to find hardware implementations for optimal schedulers, rather than to det=
ermine schedulers based on optimal hardware.

PEDF ?

There was a long debate in the congestion control technology in TSV about t=
he scalability issues of flow-aware AQM mechanisms and AFAIK, ultimately, t=
he AQM mechanisms that won out where the ones that did not require this (su=
ch as PIE).  We also had round 1 of deterministic services (if i may call t=
hem that) using rfc2212 with RSVP fail because of real or assumed infeasibi=
lity to scale on multiple dimensions. IMHO it actually failed also because =
of assumed infeasibility becasue there was no good analysis and documentati=
on of what actually could be made to work (badmouthing...).

>From this experience i can only recommend to make sure that we do understan=
d what and how something is feasible to be implemented a what scale and spe=
ed.=20

For example, i am not aware to have seen general purpose EDF hardware at sc=
ale. But i am very interested for any pointers. On the research side, this =
one is the oldest one for PIFO i know:

https://eur01.safelinks.protection.outlook.com/?url=3Dhttp%3A%2F%2Fweb.mit.=
edu%2Fpifo%2Fpifo-sigcomm.pdf&amp;data=3D04%7C01%7Cyaakov_s%40rad.com%7Ccb4=
381151b5f494cc2ce08d8e2505295%7Cf9047108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C=
637508181910510455%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu=
MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DLCK5i%2BmLewtZdjJIK7R=
lDPFqIRONvgefZxaX1f91ckw%3D&amp;reserved=3D0

[ i am of course mentioning PIFO because by using deadline as the PIFO rank=
, one has
  a simple approach to implement EDF].

In this work, if i remember my analysis correctly, the scale still depends =
on the number of flows and the ability to identify packets to flows (need t=
o read it again though).

This _may_ be acceptable in specific use-cases but should IMHO be well unde=
rstood and documented, especially when the view from the outside is that by=
 using e.g.: SR packet headers it is "looking" as if there is really no per=
-flow scaling aspect to the hardware requiremens. After all, the idea of so=
urce routing with SR and having the state in the packet is to eliminate the=
 need to have) and scale it in the router.

Cheers
    Toerless

> >> Sorry that's a typo. I mean PIFO (although we do have a paper under re=
view using the name PIPO). Yes I agree those are just abstract primitives. =
The actual implementation, if customized to a particular algorithm, would b=
e simpler.
>=20
> Y(J)S
>=20
> From: Haoyu Song=20
> <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>
> Sent: 05/03/2021 22:46
> To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>;=20
> detnet@ietf.org<mailto:detnet@ietf.org>;=20
> spring@ietf.org<mailto:spring@ietf.org>;=20
> pce@ietf.org<mailto:pce@ietf.org>
> Subject: RE: new draft on segment routing approach to TSN
>=20
>=20
> CAUTION: External sender. Do not click links or open attachments unless y=
ou know the content is safe.
> Hi Yaakov,
>=20
> Just got a chance to read your draft. I agree with the comments of the ot=
hers that this is a very interesting work. I'll just add a few points.
>=20
>=20
>   1.  The use of clock time as deadline requires network synchronization,=
 and accurate measurement of per-link propagation time, which can somehow l=
imit the application scope of this work. Alternatively, one can simply budg=
et a device latency which require a router/switch to obey. In case the over=
all budget is evenly divided by the hops, a single parameter is enough. Of =
course, if one wants to customize the budget on each hop (which might be ne=
cessary considering the different capability/capacity of each hop), a stack=
 is still needed.
>   2.  Mechanism should be provisioned to track where the timing requireme=
nt is violated and by how much (e.g., using timestamp or flag). This would =
be very useful for troubleshooting.
>   3.  Recently programmable scheduler research has proposed several primi=
tives such as PIPO and PIEO and provided feasible hardware implementations.=
 The scheme proposed in this draft can easily fit into these primitives.
>=20
> Best regards,
> Haoyu
> From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>>=20
> On Behalf Of Yaakov Stein
> Sent: Tuesday, February 23, 2021 5:14 AM
> To: detnet@ietf.org<mailto:detnet@ietf.org>;=20
> spring@ietf.org<mailto:spring@ietf.org>;=20
> pce@ietf.org<mailto:pce@ietf.org>
> Subject: [spring] new draft on segment routing approach to TSN
>=20
> All,
>=20
> I would like to call your attention to a new ID=20
> https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.
> ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D04%7C01%7C
> yaakov_s%40rad.com%7Ccb4381151b5f494cc2ce08d8e2505295%7Cf9047108cc2c4e
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> C1000&amp;sdata=3DKhdBd9Z2XCTVUvweatNWyCgwZDVKssHJF2W%2Fz41Q1uY%3D&amp;r
> eserved=3D0<https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3=
A
> %2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-stein-srtsn-00.txt&amp;data=3D
> 04%7C01%7Cyaakov_s%40rad.com%7Ccb4381151b5f494cc2ce08d8e2505295%7Cf904
> 7108cc2c4e4897a343fad1b3bf9d%7C1%7C0%7C637508181910510455%7CUnknown%7C
> TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC
> I6Mn0%3D%7C1000&amp;sdata=3DKhdBd9Z2XCTVUvweatNWyCgwZDVKssHJF2W%2Fz41Q1u
> Y%3D&amp;reserved=3D0> which describes using a stack-based approach=20
> (similar to segment routing) to time sensitive networking.
> It furthermore proposes combining segment routing with this approach=20
> to TSN resulting in a unified approach to forwarding and scheduling.
>=20
> The draft is information at this point, since it discusses the concepts a=
nd does not yet pin down the precise formats.
>=20
> Apologies for simultaneously sending to 3 lists, but I am not sure=20
> which WG is the most appropriate for discussions of this topic.
>=20
>   *   DetNet is most relevant since the whole point is to control end-to-=
end latency of a time-sensitive flow.
>   *   Spring is also directly relevant due to the use of a stack in the h=
eader and the combined approach just mentioned.
>   *   PCE is relevant to the case of a central server jointly computing a=
n optimal path and local deadline stack.
> I'll let the chairs decide where discussions should be held.
>=20
> Y(J)S
>=20

> _______________________________________________
> detnet mailing list
> detnet@ietf.org
> https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.
> ietf.org%2Fmailman%2Flistinfo%2Fdetnet&amp;data=3D04%7C01%7Cyaakov_s%40r
> ad.com%7Ccb4381151b5f494cc2ce08d8e2505295%7Cf9047108cc2c4e4897a343fad1
> b3bf9d%7C1%7C0%7C637508181910510455%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC
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> ata=3Dv3Dh%2Bq0%2F8eYutLOjnkz0Aa%2BvieQW8CoRhhbv7JfN77c%3D&amp;reserved=
=3D
> 0


--
---
tte@cs.fau.de


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To: "Liubingyang (Bryan)" <liubingyang@huawei.com>, Yaakov Stein <yaakov_s@rad.com>, Haoyu Song <haoyu.song@futurewei.com>, detnet <detnet@ietf.org>, spring <spring@ietf.org>, pce <pce@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/FPEM419dAuk0SeRAiT_RGOsNLI4>
Subject: Re: [spring] new draft on segment routing approach to TSN
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Hi Bryan,

Sure, but there is no free lunch. :--))
You have added the problem of calculation of the budget.
Knowing your exact egress time in advance is not an easy task.
There will be an inaccuracy in budget calculations.

Cheers
Bala'zs


From: detnet <detnet-bounces@ietf.org> On Behalf Of Liubingyang (Bryan)
Sent: Monday, March 8, 2021 3:31 PM
To: Yaakov Stein <yaakov_s@rad.com>; Haoyu Song <haoyu.song@futurewei.com>;=
 detnet <detnet@ietf.org>; spring <spring@ietf.org>; pce <pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Some advantages.
If you use budget instead of deadline, you don't need accurate time sync.
If you use budget, the time budget encoded in packet require fewer bits tha=
n using absolute time.


The tightness is related to whether and how many flows can be admitted. It =
is related to network resource utilization and revenue.


If e2e deadline is 1ms, then time sync with 1ms accuracy will not work well=
. Using budget helps resolve this problem.

Just my two cents.

Bryan


From:Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
To:Liubingyang (Bryan) <liubingyang@huawei.com<mailto:liubingyang@huawei.co=
m>>;Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
detnet <detnet@ietf.org<mailto:detnet@ietf.org>>;spring <spring@ietf.org<ma=
ilto:spring@ietf.org>>;pce <pce@ietf.org<mailto:pce@ietf.org>>
Date:2021-03-08 21:38:20
Subject:RE: new draft on segment routing approach to TSN

Bryan

The local deadlines are specified in absolute time - not deltas.
So there is no need to add the time saved - it is already there!

As I previously replied, the accuracy of the time sync depends on the tight=
ness of the budget.
It has nothing to do with the encoding.

Y(J)S

From: Liubingyang (Bryan) <liubingyang@huawei.com<mailto:liubingyang@huawei=
.com>>
Sent: 08/03/2021 14:55
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; Haoyu Song <h=
aoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>; detnet@ietf.org<=
mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ietf.=
org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Great work. One suggestion.
If we divide the end-to-end delay budget to per-hop budgets, and carry them=
 in SR header, we can mimic using the end-to-end absolute deadline. One thi=
ng we need to do is, when the actual time used in a hop is less than the bu=
dget of this hop, you can add the remaining budget to the budget of next ho=
p. In this case, you can save a lot of bits used for time, and you don't ha=
ve to rely on accurate time sync.

Bryan (Bingyang Liu)

From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, March 8, 2021 1:37 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We'll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN


CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.
Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://protect2.fireeye.com/v1/url?k=3Dbb6c9=
c54-e4f7a554-bb6cdccf-86fc6812c361-ade234225c5dc3b6&q=3D1&e=3D61fd3663-a974=
-4041-8021-790fa60fae0d&u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outloo=
k.com%2F%3Furl%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdr=
aft-stein-srtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C71c9=
3afad8614e5d212e08d8e23156c8%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257=
C0%257C637508048843821932%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL=
CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DJ5d%252B=
z%252BmTnTm3C7%252FfD0YSo%252FXMk%252F67YxHlYVRfvv%252Fthcg%253D%26reserved=
%3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72" style=3D"word-wrap:=
break-word">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Bryan,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sure, but there is no free lunch. :--))<o:p></o:p></=
p>
<p class=3D"MsoNormal">You have added the problem of calculation of the bud=
get.<o:p></o:p></p>
<p class=3D"MsoNormal">Knowing your exact egress time in advance is not an =
easy task.<o:p></o:p></p>
<p class=3D"MsoNormal">There will be an inaccuracy in budget calculations.<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Cheers<o:p></o:p></p>
<p class=3D"MsoNormal">Bala&#8217;zs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet &lt;detnet-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>Liubingyang (Bryan)<br>
<b>Sent:</b> Monday, March 8, 2021 3:31 PM<br>
<b>To:</b> Yaakov Stein &lt;yaakov_s@rad.com&gt;; Haoyu Song &lt;haoyu.song=
@futurewei.com&gt;; detnet &lt;detnet@ietf.org&gt;; spring &lt;spring@ietf.=
org&gt;; pce &lt;pce@ietf.org&gt;<br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div id=3D"focus">
<div>
<p class=3D"MsoNormal">Some advantages.&nbsp; <o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">If you use budget instead of deadline, you don't nee=
d accurate time sync.&nbsp;
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">If you use budget, the time budget encoded in packet=
 require fewer bits than using absolute time.
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">The tightness is related to whether and how many flo=
ws can be admitted. It is related to network resource utilization and reven=
ue.&nbsp;
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">If e2e deadline is 1ms, then time sync with 1ms accu=
racy will not work well. Using budget helps resolve this problem.&nbsp;
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Just my two cents. <o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
Bryan <o:p></o:p></p>
</div>
</div>
<p style=3D"margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:6.0pt 0in =
0in 0in" name=3D"AnyOffice-Background-Image">
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b>From:</b>Yaakov St=
ein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@rad.com</a>&gt;
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b>To:</b>Liubingyang=
 (Bryan) &lt;<a href=3D"mailto:liubingyang@huawei.com">liubingyang@huawei.c=
om</a>&gt;;Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;detnet &lt;<a href=3D"mailto:detnet@ietf.org">d=
etnet@ietf.org</a>&gt;;spring
 &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;;pce &lt;<a =
href=3D"mailto:pce@ietf.org">pce@ietf.org</a>&gt;
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b>Date:</b>2021-03-0=
8 21:38:20
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b>Subject:</b>RE: ne=
w draft on segment routing approach to TSN
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">Bryan=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">The l=
ocal deadlines are specified in absolute time &#8211; not deltas.</span><o:=
p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">So th=
ere is no need to add the time saved &#8211; it is already there!</span><o:=
p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">As I =
previously replied, the accuracy of the time sync depends on the tightness =
of the budget.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">It ha=
s nothing to do with the encoding.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">Y(J)S=
</span><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Liubingyang (Bryan) &lt;<a href=3D"mail=
to:liubingyang@huawei.com">liubingyang@huawei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 14:55<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;; Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">h=
aoyu.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">Hi Ya=
akov,</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">Great=
 work. One suggestion.
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">If we=
 divide the end-to-end delay budget to per-hop budgets, and carry them in S=
R header, we can mimic using the end-to-end absolute deadline. One thing we=
 need to do is, when the actual time
 used in a hop is less than the budget of this hop, you can add the remaini=
ng budget to the budget of next hop. In this case, you can save a lot of bi=
ts used for time, and you don&#8217;t have to rely on accurate time sync.
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">Bryan=
 (Bingyang Liu)</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> detnet [<a href=3D"mailto:detnet-bounce=
s@ietf.org">mailto:detnet-bounces@ietf.org</a>]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, March 8, 2021 1:37 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I think we are in agreement.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I do not see the need for explicitly handling the ca=
se of a packet missing a LOCAL deadline,<o:p></o:p></p>
<p class=3D"MsoNormal">since the following switches will already handle thi=
s case optimally (and may still meet the overall budget).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Counting packets that miss their delay budget is ind=
eed important,
<o:p></o:p></p>
<p class=3D"MsoNormal">and a counter could be configured in the egress rout=
er for this.<o:p></o:p></p>
<p class=3D"MsoNormal">We&#8217;ll need to define this when we get to the p=
rotocol specification.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">It would be advantageous to put a threshold on the f=
ailure rate<o:p></o:p></p>
<p class=3D"MsoNormal">and feed this back to the path/stack optimizer.<o:p>=
</o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.=
song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi Yaakov,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Some feedback inline. <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yaakov Stein &lt;<a href=3D"mailto:yaak=
ov_s@rad.com">yaakov_s@rad.com</a>&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu, <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll address your points:<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; The use of clock time as deadline requires netw=
ork synchronization<o:p></o:p></p>
<p class=3D"MsoNormal">That is a basic assumption of TSN networks (IMO the =
defining assumption).<o:p></o:p></p>
<p class=3D"MsoNormal">However, the sync needn&#8217;t be highly accurate &=
#8211; it depends on the tightness of the delay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Yes, I understand it. What I mean is that t=
he method mentioned in the draft seems to be also applicable to other types=
 of networks. For example, we can envision some time-critical traffic in DC=
N or WAN. If a protocol would be developed,
 can it also serve the other networks? If so, it would be better. <o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; accurate measurement of per-link propagation ti=
me<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I am assuming that once an for all someone does=
 a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measurement of the links, a=
nd these are stored in some database.<o:p></o:p></p>
<p class=3D"MsoNormal">Once again, the required accuracy depends on the del=
ay budgets.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; which can somehow limit the application scope o=
f this work<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget only above the physically minima=
l delay by say less than 100 microseconds,
<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that the previous two issues MUST be carried=
 out. But in such cases there is no alternative.<o:p></o:p></p>
<p class=3D"MsoNormal">If the delay budget is much higher than that, then o=
ne could use an RSVP-like mechanism,<o:p></o:p></p>
<p class=3D"MsoNormal">sending a packet (or several packets) from source to=
 destination collecting a stack of timestamps,<o:p></o:p></p>
<p class=3D"MsoNormal">and then using that stack for the following packets.=
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; Mechanism should be provisioned to track where =
the timing requirement is violated and by how much<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll leave the OAM for later. However there ar=
e already many high accuracy performance measurement techniques and protoco=
ls for this.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; For this I mean something recorded in the s=
ame packet with the deadlines. If it misses the deadline, the receiver may =
need to know where it&#8217;s violated. Other independent methods are possi=
ble, but it&#8217;s better to consider if it can be
 integrated in the current proposal.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; Recently programmable scheduler research has pr=
oposed several primitives<o:p></o:p></p>
<p class=3D"MsoNormal">Yes, I tried to stress that this ID is not limited t=
o EDF (although sometimes that is a good strategy).<o:p></o:p></p>
<p class=3D"MsoNormal">One can even reproduce Qbv behavior using a stack of=
 deadlines (although why would one wish to do so?).<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&gt; such as PIPO and PIEO<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ve heard of PIFO (Push In First out) but not=
 PIPO. Is this a typo or something new?<o:p></o:p></p>
<p class=3D"MsoNormal">I agree that there are mechanisms that are optimized=
 for hardware, but I have come up with a very nice hardware implementation =
for PEDF<o:p></o:p></p>
<p class=3D"MsoNormal">and prefer to find hardware implementations for opti=
mal schedulers, rather than to determine schedulers based on optimal hardwa=
re.<o:p></o:p></p>
<p class=3D"MsoNormal">&gt;&gt; Sorry that&#8217;s a typo. I mean PIFO (alt=
hough we do have a paper under review using the name PIPO). Yes I agree tho=
se are just abstract primitives. The actual implementation, if customized t=
o a particular algorithm, would be simpler.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.=
song@futurewei.com">haoyu.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;=
color:#212121">CAUTION:</span></b><span style=3D"font-size:9.0pt;font-famil=
y:&quot;Arial&quot;,sans-serif;color:#212121"> External sender. Do not clic=
k links or open attachments unless you know the content
 is safe. </span><o:p></o:p></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"color:white">Hi Yaakov,</span><o:p></=
o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Just got a chance to read your draft. I agree with t=
he comments of the others that this is a very interesting work. I&#8217;ll =
just add a few points.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo1">The use of clock =
time as deadline requires network synchronization, and accurate measurement=
 of per-link propagation time, which can somehow limit the application scop=
e of this work. Alternatively, one can
 simply budget a device latency which require a router/switch to obey. In c=
ase the overall budget is evenly divided by the hops, a single parameter is=
 enough. Of course, if one wants to customize the budget on each hop (which=
 might be necessary considering
 the different capability/capacity of each hop), a stack is still needed. <=
o:p></o:p></li><li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo1">Me=
chanism should be provisioned to track where the timing requirement is viol=
ated and by how much (e.g., using timestamp or flag). This would be very us=
eful for troubleshooting.<o:p></o:p></li><li class=3D"MsoNormal" style=3D"m=
so-list:l1 level1 lfo1">Recently programmable scheduler research has propos=
ed several primitives such as PIPO and PIEO and provided feasible hardware =
implementations. The scheme proposed in this draft can easily fit into thes=
e
 primitives.<o:p></o:p></li></ol>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Haoyu<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">All, <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to call your attention to a new ID <a h=
ref=3D"https://protect2.fireeye.com/v1/url?k=3Dbb6c9c54-e4f7a554-bb6cdccf-8=
6fc6812c361-ade234225c5dc3b6&amp;q=3D1&amp;e=3D61fd3663-a974-4041-8021-790f=
a60fae0d&amp;u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outlook.com%2F%3F=
url%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdraft-stein-s=
rtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C71c93afad8614e5=
d212e08d8e23156c8%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257C0%257C6375=
08048843821932%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu=
MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DJ5d%252Bz%252BmTnTm=
3C7%252FfD0YSo%252FXMk%252F67YxHlYVRfvv%252Fthcg%253D%26reserved%3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></p=
>
<p class=3D"MsoNormal">which describes using a stack-based approach (simila=
r to segment routing) to time sensitive networking.<o:p></o:p></p>
<p class=3D"MsoNormal">It furthermore proposes combining segment routing wi=
th this approach to TSN<o:p></o:p></p>
<p class=3D"MsoNormal">resulting in a unified approach to forwarding and sc=
heduling.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The draft is information at this point, since it dis=
cusses the concepts and does not yet pin down the precise formats.<o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Apologies for simultaneously sending to 3 lists, <o:=
p></o:p></p>
<p class=3D"MsoNormal">but I am not sure which WG is the most appropriate f=
or discussions of this topic.<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2">DetNet is most re=
levant since the whole point is to control end-to-end latency of a time-sen=
sitive flow.<o:p></o:p></li><li class=3D"MsoNormal" style=3D"mso-list:l0 le=
vel1 lfo2">Spring is also directly relevant due to the use of a stack in th=
e header and the combined approach just mentioned.<o:p></o:p></li><li class=
=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2">PCE is relevant to the cas=
e of a central server jointly computing an optimal path and local deadline =
stack.<o:p></o:p></li></ul>
<p class=3D"MsoNormal">I&#8217;ll let the chairs decide where discussions s=
hould be held.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
</div>
</div>
</body>
</html>

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From: "Liubingyang (Bryan)" <liubingyang@huawei.com>
To: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>, "Yaakov Stein" <yaakov_s@rad.com>, Haoyu Song <haoyu.song@futurewei.com>, detnet <detnet@ietf.org>, spring <spring@ietf.org>, pce <pce@ietf.org>
Thread-Topic: new draft on segment routing approach to TSN
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Subject: Re: [spring] new draft on segment routing approach to TSN
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You are absolutely right : )

I see the remaining budget calculation as the difficulty in device implemen=
tation.
But I see the bit length as protocol overhead, and time sync as deployment =
difficulty.

Actually all possibilities can be discussed, and when used in different sce=
narios, different profiles (combinations of modules) may be used.

Best
Bryan

From: Bal=E1zs Varga A [mailto:balazs.a.varga@ericsson.com]
Sent: Tuesday, March 9, 2021 5:17 PM
To: Liubingyang (Bryan) <liubingyang@huawei.com>; Yaakov Stein <yaakov_s@ra=
d.com>; Haoyu Song <haoyu.song@futurewei.com>; detnet <detnet@ietf.org>; sp=
ring <spring@ietf.org>; pce <pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Bryan,

Sure, but there is no free lunch. :--))
You have added the problem of calculation of the budget.
Knowing your exact egress time in advance is not an easy task.
There will be an inaccuracy in budget calculations.

Cheers
Bala'zs


From: detnet <detnet-bounces@ietf.org<mailto:detnet-bounces@ietf.org>> On B=
ehalf Of Liubingyang (Bryan)
Sent: Monday, March 8, 2021 3:31 PM
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; Haoyu Song <h=
aoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>; detnet <detnet@i=
etf.org<mailto:detnet@ietf.org>>; spring <spring@ietf.org<mailto:spring@iet=
f.org>>; pce <pce@ietf.org<mailto:pce@ietf.org>>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Some advantages.
If you use budget instead of deadline, you don't need accurate time sync.
If you use budget, the time budget encoded in packet require fewer bits tha=
n using absolute time.


The tightness is related to whether and how many flows can be admitted. It =
is related to network resource utilization and revenue.


If e2e deadline is 1ms, then time sync with 1ms accuracy will not work well=
. Using budget helps resolve this problem.

Just my two cents.

Bryan


From:Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
To:Liubingyang (Bryan) <liubingyang@huawei.com<mailto:liubingyang@huawei.co=
m>>;Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
detnet <detnet@ietf.org<mailto:detnet@ietf.org>>;spring <spring@ietf.org<ma=
ilto:spring@ietf.org>>;pce <pce@ietf.org<mailto:pce@ietf.org>>
Date:2021-03-08 21:38:20
Subject:RE: new draft on segment routing approach to TSN

Bryan

The local deadlines are specified in absolute time - not deltas.
So there is no need to add the time saved - it is already there!

As I previously replied, the accuracy of the time sync depends on the tight=
ness of the budget.
It has nothing to do with the encoding.

Y(J)S

From: Liubingyang (Bryan) <liubingyang@huawei.com<mailto:liubingyang@huawei=
.com>>
Sent: 08/03/2021 14:55
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; Haoyu Song <h=
aoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>; detnet@ietf.org<=
mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ietf.=
org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Great work. One suggestion.
If we divide the end-to-end delay budget to per-hop budgets, and carry them=
 in SR header, we can mimic using the end-to-end absolute deadline. One thi=
ng we need to do is, when the actual time used in a hop is less than the bu=
dget of this hop, you can add the remaining budget to the budget of next ho=
p. In this case, you can save a lot of bits used for time, and you don't ha=
ve to rely on accurate time sync.

Bryan (Bingyang Liu)

From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, March 8, 2021 1:37 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: Re: [Detnet] new draft on segment routing approach to TSN

Haoyu

I think we are in agreement.

I do not see the need for explicitly handling the case of a packet missing =
a LOCAL deadline,
since the following switches will already handle this case optimally (and m=
ay still meet the overall budget).

Counting packets that miss their delay budget is indeed important,
and a counter could be configured in the egress router for this.
We'll need to define this when we get to the protocol specification.

It would be advantageous to put a threshold on the failure rate
and feed this back to the path/stack optimizer.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 08/03/2021 04:41
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Hi Yaakov,

Some feedback inline.

Best regards,
Haoyu

From: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>
Sent: Saturday, March 6, 2021 8:36 PM
To: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>>;=
 detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@iet=
f.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN

Haoyu,

I'll address your points:

> The use of clock time as deadline requires network synchronization
That is a basic assumption of TSN networks (IMO the defining assumption).
However, the sync needn't be highly accurate - it depends on the tightness =
of the delay budgets.
>> Yes, I understand it. What I mean is that the method mentioned in the dr=
aft seems to be also applicable to other types of networks. For example, we=
 can envision some time-critical traffic in DCN or WAN. If a protocol would=
 be developed, can it also serve the other networks? If so, it would be bet=
ter.


> accurate measurement of per-link propagation time
Yes, I am assuming that once an for all someone does a TDR or at least OWAM=
P/TWAMP/Y.1731-1wD delay measurement of the links, and these are stored in =
some database.
Once again, the required accuracy depends on the delay budgets.

> which can somehow limit the application scope of this work
If the delay budget only above the physically minimal delay by say less tha=
n 100 microseconds,
I agree that the previous two issues MUST be carried out. But in such cases=
 there is no alternative.
If the delay budget is much higher than that, then one could use an RSVP-li=
ke mechanism,
sending a packet (or several packets) from source to destination collecting=
 a stack of timestamps,
and then using that stack for the following packets.

> Mechanism should be provisioned to track where the timing requirement is =
violated and by how much
I'll leave the OAM for later. However there are already many high accuracy =
performance measurement techniques and protocols for this.
>> For this I mean something recorded in the same packet with the deadlines=
. If it misses the deadline, the receiver may need to know where it's viola=
ted. Other independent methods are possible, but it's better to consider if=
 it can be integrated in the current proposal.

> Recently programmable scheduler research has proposed several primitives
Yes, I tried to stress that this ID is not limited to EDF (although sometim=
es that is a good strategy).
One can even reproduce Qbv behavior using a stack of deadlines (although wh=
y would one wish to do so?).

> such as PIPO and PIEO
I've heard of PIFO (Push In First out) but not PIPO. Is this a typo or some=
thing new?
I agree that there are mechanisms that are optimized for hardware, but I ha=
ve come up with a very nice hardware implementation for PEDF
and prefer to find hardware implementations for optimal schedulers, rather =
than to determine schedulers based on optimal hardware.
>> Sorry that's a typo. I mean PIFO (although we do have a paper under revi=
ew using the name PIPO). Yes I agree those are just abstract primitives. Th=
e actual implementation, if customized to a particular algorithm, would be =
simpler.

Y(J)S

From: Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>=
>
Sent: 05/03/2021 22:46
To: Yaakov Stein <yaakov_s@rad.com<mailto:yaakov_s@rad.com>>; detnet@ietf.o=
rg<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>; pce@ie=
tf.org<mailto:pce@ietf.org>
Subject: RE: new draft on segment routing approach to TSN



CAUTION: External sender. Do not click links or open attachments unless you=
 know the content is safe.

Hi Yaakov,

Just got a chance to read your draft. I agree with the comments of the othe=
rs that this is a very interesting work. I'll just add a few points.


  1.  The use of clock time as deadline requires network synchronization, a=
nd accurate measurement of per-link propagation time, which can somehow lim=
it the application scope of this work. Alternatively, one can simply budget=
 a device latency which require a router/switch to obey. In case the overal=
l budget is evenly divided by the hops, a single parameter is enough. Of co=
urse, if one wants to customize the budget on each hop (which might be nece=
ssary considering the different capability/capacity of each hop), a stack i=
s still needed.
  2.  Mechanism should be provisioned to track where the timing requirement=
 is violated and by how much (e.g., using timestamp or flag). This would be=
 very useful for troubleshooting.
  3.  Recently programmable scheduler research has proposed several primiti=
ves such as PIPO and PIEO and provided feasible hardware implementations. T=
he scheme proposed in this draft can easily fit into these primitives.

Best regards,
Haoyu
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Yaakov Stein
Sent: Tuesday, February 23, 2021 5:14 AM
To: detnet@ietf.org<mailto:detnet@ietf.org>; spring@ietf.org<mailto:spring@=
ietf.org>; pce@ietf.org<mailto:pce@ietf.org>
Subject: [spring] new draft on segment routing approach to TSN

All,

I would like to call your attention to a new ID https://www.ietf.org/archiv=
e/id/draft-stein-srtsn-00.txt<https://protect2.fireeye.com/v1/url?k=3Dbb6c9=
c54-e4f7a554-bb6cdccf-86fc6812c361-ade234225c5dc3b6&q=3D1&e=3D61fd3663-a974=
-4041-8021-790fa60fae0d&u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outloo=
k.com%2F%3Furl%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdr=
aft-stein-srtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C71c9=
3afad8614e5d212e08d8e23156c8%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257=
C0%257C637508048843821932%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL=
CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DJ5d%252B=
z%252BmTnTm3C7%252FfD0YSo%252FXMk%252F67YxHlYVRfvv%252Fthcg%253D%26reserved=
%3D0>
which describes using a stack-based approach (similar to segment routing) t=
o time sensitive networking.
It furthermore proposes combining segment routing with this approach to TSN
resulting in a unified approach to forwarding and scheduling.

The draft is information at this point, since it discusses the concepts and=
 does not yet pin down the precise formats.

Apologies for simultaneously sending to 3 lists,
but I am not sure which WG is the most appropriate for discussions of this =
topic.

  *   DetNet is most relevant since the whole point is to control end-to-en=
d latency of a time-sensitive flow.
  *   Spring is also directly relevant due to the use of a stack in the hea=
der and the combined approach just mentioned.
  *   PCE is relevant to the case of a central server jointly computing an =
optimal path and local deadline stack.
I'll let the chairs decide where discussions should be held.

Y(J)S


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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">You are absolutely right : )
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">I see the remaining budget calculation as the difficulty in devic=
e implementation.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">But I see the bit length as protocol overhead, and time sync as d=
eployment difficulty.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Actually all possibilities can be discussed, and when used in dif=
ferent scenarios, different profiles (combinations of modules) may be used.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Best<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Bryan
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Bal=E1zs Varga A [mailto:balazs.a.varga@ericsson.com]
<br>
<b>Sent:</b> Tuesday, March 9, 2021 5:17 PM<br>
<b>To:</b> Liubingyang (Bryan) &lt;liubingyang@huawei.com&gt;; Yaakov Stein=
 &lt;yaakov_s@rad.com&gt;; Haoyu Song &lt;haoyu.song@futurewei.com&gt;; det=
net &lt;detnet@ietf.org&gt;; spring &lt;spring@ietf.org&gt;; pce &lt;pce@ie=
tf.org&gt;<br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Bryan,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sure, but there is no free lunc=
h. :--))<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You have added the problem of c=
alculation of the budget.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Knowing your exact egress time =
in advance is not an easy task.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">There will be an inaccuracy in =
budget calculations.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Bala&#8217;zs<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> detnet &lt;<a href=3D"mailto:detnet-bounces@ietf.org">detnet-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Liubingyang (Bryan)<br>
<b>Sent:</b> Monday, March 8, 2021 3:31 PM<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;; Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">h=
aoyu.song@futurewei.com</a>&gt;; detnet &lt;<a href=3D"mailto:detnet@ietf.o=
rg">detnet@ietf.org</a>&gt;; spring &lt;<a href=3D"mailto:spring@ietf.org">=
spring@ietf.org</a>&gt;;
 pce &lt;<a href=3D"mailto:pce@ietf.org">pce@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div id=3D"focus">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Some advantages.&nbsp; <o:p></o=
:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If you use budget instead of de=
adline, you don't need accurate time sync.&nbsp;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If you use budget, the time bud=
get encoded in packet require fewer bits than using absolute time.
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The tightness is related to whe=
ther and how many flows can be admitted. It is related to network resource =
utilization and revenue.&nbsp;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If e2e deadline is 1ms, then ti=
me sync with 1ms accuracy will not work well. Using budget helps resolve th=
is problem.&nbsp;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Just my two cents. <o:p></o:p><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span lang=3D"EN-US">=
<br>
Bryan <o:p></o:p></span></p>
</div>
</div>
<p style=3D"margin-bottom:12.0pt"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></s=
pan></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:6.0pt 0cm =
0cm 0cm" name=3D"AnyOffice-Background-Image">
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">From:</span></b><span lang=3D"EN-US">Yaakov Stein &lt;<a href=3D"mailto:=
yaakov_s@rad.com">yaakov_s@rad.com</a>&gt;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">To:</span></b><span lang=3D"EN-US">Liubingyang (Bryan) &lt;<a href=3D"ma=
ilto:liubingyang@huawei.com">liubingyang@huawei.com</a>&gt;;Haoyu Song &lt;=
<a href=3D"mailto:haoyu.song@futurewei.com">haoyu.song@futurewei.com</a>&gt=
;;detnet
 &lt;<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>&gt;;spring &lt;=
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;;pce &lt;<a href=
=3D"mailto:pce@ietf.org">pce@ietf.org</a>&gt;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">Date:</span></b><span lang=3D"EN-US">2021-03-08 21:38:20
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">Subject:</span></b><span lang=3D"EN-US">RE: new draft on segment routing=
 approach to TSN
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Bryan</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">The local deadlines are specified in absolute time &#8211; not de=
ltas.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">So there is no need to add the time saved &#8211; it is already t=
here!</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">As I previously replied, the accuracy of the time sync depends on=
 the tightness of the budget.</span><span lang=3D"EN-US"><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">It has nothing to do with the encoding.</span><span lang=3D"EN-US=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Y(J)S</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Liubingyang (Bryan) &lt;<a href=3D"mailto:liubingyang@huawei.co=
m">liubingyang@huawei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 14:55<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;; Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">h=
aoyu.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Yaakov,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Great work. One suggestion.
</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">If we divide the end-to-end delay budget to per-hop budgets, and =
carry them in SR header, we can mimic using the end-to-end absolute deadlin=
e. One thing we need to do is, when the
 actual time used in a hop is less than the budget of this hop, you can add=
 the remaining budget to the budget of next hop. In this case, you can save=
 a lot of bits used for time, and you don&#8217;t have to rely on accurate =
time sync.
</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Bryan (Bingyang Liu)</span><span lang=3D"EN-US"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> detnet [<a href=3D"mailto:detnet-bounces@ietf.org">mailto:detne=
t-bounces@ietf.org</a>]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, March 8, 2021 1:37 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> Re: [Detnet] new draft on segment routing approach to TSN<o=
:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I think we are in agreement.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I do not see the need for expli=
citly handling the case of a packet missing a LOCAL deadline,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">since the following switches wi=
ll already handle this case optimally (and may still meet the overall budge=
t).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Counting packets that miss thei=
r delay budget is indeed important,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and a counter could be configur=
ed in the egress router for this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">We&#8217;ll need to define this=
 when we get to the protocol specification.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It would be advantageous to put=
 a threshold on the failure rate<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and feed this back to the path/=
stack optimizer.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoy=
u.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 08/03/2021 04:41<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Yaakov,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Some feedback inline. <o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@r=
ad.com</a>&gt;
<br>
<b>Sent:</b> Saturday, March 6, 2021 8:36 PM<br>
<b>To:</b> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoyu=
.song@futurewei.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll address your points:=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; The use of clock time as d=
eadline requires network synchronization<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">That is a basic assumption of T=
SN networks (IMO the defining assumption).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">However, the sync needn&#8217;t=
 be highly accurate &#8211; it depends on the tightness of the delay budget=
s.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; Yes, I understand it. =
What I mean is that the method mentioned in the draft seems to be also appl=
icable to other types of networks. For example, we can envision some time-c=
ritical traffic in DCN or WAN. If a protocol
 would be developed, can it also serve the other networks? If so, it would =
be better.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; accurate measurement of pe=
r-link propagation time<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes, I am assuming that once an=
 for all someone does a TDR or at least OWAMP/TWAMP/Y.1731-1wD delay measur=
ement of the links, and these are stored in some database.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Once again, the required accura=
cy depends on the delay budgets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; which can somehow limit th=
e application scope of this work<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If the delay budget only above =
the physically minimal delay by say less than 100 microseconds,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I agree that the previous two i=
ssues MUST be carried out. But in such cases there is no alternative.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If the delay budget is much hig=
her than that, then one could use an RSVP-like mechanism,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">sending a packet (or several pa=
ckets) from source to destination collecting a stack of timestamps,<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and then using that stack for t=
he following packets.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; Mechanism should be provis=
ioned to track where the timing requirement is violated and by how much<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll leave the OAM for la=
ter. However there are already many high accuracy performance measurement t=
echniques and protocols for this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; For this I mean someth=
ing recorded in the same packet with the deadlines. If it misses the deadli=
ne, the receiver may need to know where it&#8217;s violated. Other independ=
ent methods are possible, but it&#8217;s better to consider
 if it can be integrated in the current proposal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; Recently programmable sche=
duler research has proposed several primitives<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes, I tried to stress that thi=
s ID is not limited to EDF (although sometimes that is a good strategy).<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">One can even reproduce Qbv beha=
vior using a stack of deadlines (although why would one wish to do so?).<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; such as PIPO and PIEO<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ve heard of PIFO (Push =
In First out) but not PIPO. Is this a typo or something new?<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I agree that there are mechanis=
ms that are optimized for hardware, but I have come up with a very nice har=
dware implementation for PEDF<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">and prefer to find hardware imp=
lementations for optimal schedulers, rather than to determine schedulers ba=
sed on optimal hardware.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt;&gt; Sorry that&#8217;s a t=
ypo. I mean PIFO (although we do have a paper under review using the name P=
IPO). Yes I agree those are just abstract primitives. The actual implementa=
tion, if customized to a particular algorithm, would
 be simpler. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Haoyu Song &lt;<a href=3D"mailto:haoyu.song@futurewei.com">haoy=
u.song@futurewei.com</a>&gt;
<br>
<b>Sent:</b> 05/03/2021 22:46<br>
<b>To:</b> Yaakov Stein &lt;<a href=3D"mailto:yaakov_s@rad.com">yaakov_s@ra=
d.com</a>&gt;;
<a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=3D"mailto:s=
pring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> RE: new draft on segment routing approach to TSN<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" align=3D"left">
<tbody>
<tr>
<td style=3D"background:#BBA555;padding:5.25pt 5.5pt 5.25pt 1.5pt"></td>
<td width=3D"100%" style=3D"width:100.0%;background:#FFE599;padding:5.25pt =
3.75pt 5.25pt 11.25pt">
<div>
<p style=3D"mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-w=
rap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizon=
tal:column;mso-height-rule:exactly">
<b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font-family:&quot;Arial&qu=
ot;,sans-serif;color:#212121">CAUTION:</span></b><span lang=3D"EN-US" style=
=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:#212121"=
> External sender. Do not click links or open attachments unless
 you know the content is safe. </span><span lang=3D"EN-US"><o:p></o:p></spa=
n></p>
</div>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:white">Hi Yaakov=
,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Just got a chance to read your =
draft. I agree with the comments of the others that this is a very interest=
ing work. I&#8217;ll just add a few points.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l3 level1 lfo3"><span lang=3D"EN-=
US">The use of clock time as deadline requires network synchronization, and=
 accurate measurement of per-link propagation time, which can somehow limit=
 the application scope of this work. Alternatively,
 one can simply budget a device latency which require a router/switch to ob=
ey. In case the overall budget is evenly divided by the hops, a single para=
meter is enough. Of course, if one wants to customize the budget on each ho=
p (which might be necessary considering
 the different capability/capacity of each hop), a stack is still needed. <=
o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"mso-list:l3 level1 l=
fo3"><span lang=3D"EN-US">Mechanism should be provisioned to track where th=
e timing requirement is violated and by how much (e.g., using timestamp or =
flag). This would be very useful for troubleshooting.<o:p></o:p></span></li=
><li class=3D"MsoNormal" style=3D"mso-list:l3 level1 lfo3"><span lang=3D"EN=
-US">Recently programmable scheduler research has proposed several primitiv=
es such as PIPO and PIEO and provided feasible hardware implementations. Th=
e scheme proposed in this draft can easily
 fit into these primitives.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Haoyu<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Tuesday, February 23, 2021 5:14 AM<br>
<b>To:</b> <a href=3D"mailto:detnet@ietf.org">detnet@ietf.org</a>; <a href=
=3D"mailto:spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:pce@ietf.org">pce@ietf.org</a><br>
<b>Subject:</b> [spring] new draft on segment routing approach to TSN<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">All, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I would like to call your atten=
tion to a new ID
<a href=3D"https://protect2.fireeye.com/v1/url?k=3Dbb6c9c54-e4f7a554-bb6cdc=
cf-86fc6812c361-ade234225c5dc3b6&amp;q=3D1&amp;e=3D61fd3663-a974-4041-8021-=
790fa60fae0d&amp;u=3Dhttps%3A%2F%2Feur01.safelinks.protection.outlook.com%2=
F%3Furl%3Dhttps%253A%252F%252Fwww.ietf.org%252Farchive%252Fid%252Fdraft-ste=
in-srtsn-00.txt%26data%3D04%257C01%257Cyaakov_s%2540rad.com%257C71c93afad86=
14e5d212e08d8e23156c8%257Cf9047108cc2c4e4897a343fad1b3bf9d%257C1%257C0%257C=
637508048843821932%257CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoi=
V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DJ5d%252Bz%252Bm=
TnTm3C7%252FfD0YSo%252FXMk%252F67YxHlYVRfvv%252Fthcg%253D%26reserved%3D0">
https://www.ietf.org/archive/id/draft-stein-srtsn-00.txt</a> <o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">which describes using a stack-b=
ased approach (similar to segment routing) to time sensitive networking.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It furthermore proposes combini=
ng segment routing with this approach to TSN<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">resulting in a unified approach=
 to forwarding and scheduling.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft is information at thi=
s point, since it discusses the concepts and does not yet pin down the prec=
ise formats.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Apologies for simultaneously se=
nding to 3 lists,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">but I am not sure which WG is t=
he most appropriate for discussions of this topic.<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo6"><span lang=3D"EN-=
US">DetNet is most relevant since the whole point is to control end-to-end =
latency of a time-sensitive flow.<o:p></o:p></span></li><li class=3D"MsoNor=
mal" style=3D"mso-list:l0 level1 lfo6"><span lang=3D"EN-US">Spring is also =
directly relevant due to the use of a stack in the header and the combined =
approach just mentioned.<o:p></o:p></span></li><li class=3D"MsoNormal" styl=
e=3D"mso-list:l0 level1 lfo6"><span lang=3D"EN-US">PCE is relevant to the c=
ase of a central server jointly computing an optimal path and local deadlin=
e stack.<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ll let the chairs decid=
e where discussions should be held.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Y(J)S<o:p></o:p></span></p>
<div>
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To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: RTG-DIR review of draft-ietf-bess-srv6-services-05
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Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: Manomugdha Biswas <manomugdha.biswas@keysight.com>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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Date: Wed, 10 Mar 2021 10:48:46 +0000
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Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Manomugdha Biswas <manomugdha.biswas@keysight.com>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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--_004_MWHPR08MB35204D5D361D787C056E0C5CF7919MWHPR08MB3520namp_--


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From: Manomugdha Biswas <manomugdha.biswas@keysight.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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To: Manomugdha Biswas <manomugdha.biswas@keysight.com>, "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
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Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Manomugdha Biswas <manomugdha.biswas@keysight.com>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/PgmzeCB7APmfv8sizbGDs6ZqcrY>
Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Manomugdha Biswas <manomugdha.biswas@keysight.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/hGbgWXX1DW7JXX9kL6KKKnueoCM>
Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
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Thread-Topic: RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: RTG-DIR review of draft-ietf-bess-srv6-services-05
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Date: Wed, 10 Mar 2021 14:10:00 +0000
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
CC: "draft-ietf-bess-srv6-services.all@ietf.org" <draft-ietf-bess-srv6-services.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
Thread-Topic: RTG-DIR review of draft-ietf-bess-srv6-services-05
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Subject: Re: [spring] RTG-DIR review of draft-ietf-bess-srv6-services-05
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From: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>
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Thread-Topic: Results of SR compression analysis?
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Subject: [spring] Results of SR compression analysis?
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Hi SPRING,

First of all, I really appreciate the SR compression design team for their =
hard work.
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.

I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?

Again, thanks to the contributions and looking forward to the results in th=
e near future.

Best regards,
Fan

[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00

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fy-trim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi SPRING,<br>
<br>
First of all, I really appreciate the SR compression design team for their =
hard work.
<br>
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.
<br>
<br>
I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?<br=
>
<br>
Again, thanks to the contributions and looking forward to the results in th=
e near future.
<br>
<br>
Best regards,<br>
Fan<br>
<br>
[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00<o:p></o:p></span></p>
</div>
</body>
</html>

--_000_cb87ac70d5a248b9a2267631ac610b14huaweicom_--


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To: Ron Bonica <rbonica@juniper.net>
References: <157427968687.30499.12746720021642298350.idtracker@ietfa.amsl.com> <BN7PR05MB56995104653D17612CFBE81DAE4F0@BN7PR05MB5699.namprd05.prod.outlook.com> <03714368-c3a5-3215-e92a-21346aa5fc0c@uniroma2.it> <DM6PR05MB63485E661284C26707CDC07FAEAA0@DM6PR05MB6348.namprd05.prod.outlook.com>
Cc: SPRING WG <spring@ietf.org>, 6man <6man@ietf.org>
From: Stefano Salsano <stefano.salsano@uniroma2.it>
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Subject: Re: [spring] FW: New Version Notification for draft-bonica-6man-comp-rtg-hdr-09.txt
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Il 2020-04-30 16:31, Ron Bonica ha scritto:
> Stefano,
> 
> We have a LINUX implementation that we can share with you.
> 
> Also, some students from Harvey Mudd University have put together a benchmarking methodology.
> 
> I will contact you off-list.

Hi Ron,

this topic has come back to my mind when going through the SPRING 
meeting material... I've not heard anything from you after this message, 
but I'm still interested in working on the topic, is there any 
open-source implementation available?

thank you!

ciao
Stefano

> 
>                                           Ron
> 
> 
> 
> Juniper Business Use Only
> 
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of Stefano Salsano
> Sent: Thursday, April 30, 2020 10:16 AM
> To: SPRING WG <spring@ietf.org>; 6man <6man@ietf.org>
> Subject: Re: [spring] FW: New Version Notification for draft-bonica-6man-comp-rtg-hdr-09.txt
> 
> [External Email. Be cautious of content]
> 
> 
> Il 2019-11-20 20:57, Ron Bonica ha scritto:
>> -----Original Message-----
>> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
>> Sent: Wednesday, November 20, 2019 2:55 PM
>>
>> A new version of I-D, draft-bonica-6man-comp-rtg-hdr-09.txt
>> has been successfully submitted by Ron Bonica and posted to the IETF repository.
> 
> Dear authors of draft-bonica-6man-comp-rtg-hdr-09.txt,
> 
> we are working on the performance evaluation of SRv6 architectures and of their open source implementation
> 
> we would like to include SRm6/CRH in our analysis, do you have an open source implementation of SRm6/CRH ?
> 
> FYI, we have already compared Linux and VPP implementations of SRv6/SRH and published results in these papers:
> 
> - https://urldefense.com/v3/__https://arxiv.org/pdf/2001.06182__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPOEkkDnLG$
> - https://urldefense.com/v3/__https://ieeexplore.ieee.org/document/8584976__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPOLux8mIj$  (preliminary work)
> 
> we have also released SRPerf, an open source performance evaluation
> framework:
> 
> - https://urldefense.com/v3/__https://srouting.github.io/SRPerf/__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPON67SyEp$
> 
> thank you
> Stefano
> 
>> Name:         draft-bonica-6man-comp-rtg-hdr
>> Revision:     09
>> Title:                The IPv6 Compressed Routing
>>       Header (CRH)
>> Document date:        2019-11-20
>> URL:            https://urldefense.com/v3/__https://tools.ietf.org/id/draft-bonica-6man-comp-rtg-hdr-09.txt__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPOJfDK14o$
>>
>> Abstract:
>>      This document defines two new IPv6 Routing header types.
>>      Generically, they are called the Compressed Routing Header (CRH).
>>      More specifically, the 16-bit version of the CRH is called the CRH-
>>      16, while the 32-bit version of the CRH is called the CRH-32.  SRm6
>>      nodes use the CRH to steer packets from segment to segment along SRm6
>>      paths.
> 
> --
> *******************************************************************
> Stefano Salsano
> Professore Associato
> Dipartimento Ingegneria Elettronica
> Universita' di Roma Tor Vergata
> Viale Politecnico, 1 - 00133 Roma - ITALY
> 
> https://urldefense.com/v3/__http://netgroup.uniroma2.it/Stefano_Salsano/__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPODZuAR74$
> 
> E-mail  : stefano.salsano@uniroma2.it
> Cell.   : +39 320 4307310
> Office  : (Tel.) +39 06 72597770 (Fax.) +39 06 72597435
> *******************************************************************
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spring__;!!NEt6yMaO-gk!SBU8MP13HWZE5BBlvaSUWi8f9tzyGisoOF6RIjbTq4naReGfTp_HhUyPOFn6jghM$
> 
> Juniper Business Use Only
> 


-- 
*******************************************************************
Stefano Salsano
Professore Associato
Dipartimento Ingegneria Elettronica
Universita' di Roma Tor Vergata
Viale Politecnico, 1 - 00133 Roma - ITALY

http://netgroup.uniroma2.it/Stefano_Salsano/

E-mail  : stefano.salsano@uniroma2.it
Cell.   : +39 320 4307310
Office  : (Tel.) +39 06 72597770 (Fax.) +39 06 72597435
*******************************************************************


From nobody Wed Mar 10 09:54:17 2021
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Subject: [spring] I-D Action: draft-ietf-spring-sr-service-programming-04.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           : Service Programming with Segment Routing
        Authors         : Francois Clad
                          Xiaohu Xu
                          Clarence Filsfils
                          Daniel Bernier
                          Cheng Li
                          Bruno Decraene
                          Shaowen Ma
                          Chaitanya Yadlapalli
                          Wim Henderickx
                          Stefano Salsano
	Filename        : draft-ietf-spring-sr-service-programming-04.txt
	Pages           : 38
	Date            : 2021-03-10

Abstract:
   This document defines data plane functionality required to implement
   service segments and achieve service programming in SR-enabled MPLS
   and IPv6 networks, as described in the Segment Routing architecture.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-service-programming/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-sr-service-programming-04
https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-service-programming-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-sr-service-programming-04


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

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



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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Results of SR compression analysis?
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Subject: Re: [spring] Results of SR compression analysis?
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Hi Fan, I fixed the link in the minutes.
https://mailarchive.ietf.org/arch/msg/srcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/
  Thanks for drawing that to our attention.
That analysis was done on Feb 11 but the design team decided not to review =
and submit any of its content (except for the structure) before the Feb 22 =
cutoff.

We should



On 2021-03-10, 12:18 PM, "spring" <spring-bounces@ietf.org> wrote:


Hi SPRING,

First of all, I really appreciate the SR compression design team for their =
hard work.
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.

I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?

Again, thanks to the contributions and looking forward to the results in th=
e near future.

Best regards,
Fan

[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Hi F=
an, I fixed the link in the minutes.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><a h=
ref=3D"https://mailarchive.ietf.org/arch/msg/srcomp/ryOuYQbquExcmdi8a9KSNy4=
FAV4/">https://mailarchive.ietf.org/arch/msg/srcomp/ryOuYQbquExcmdi8a9KSNy4=
FAV4/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p; Thanks for drawing that to our attention.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">That=
 analysis was done on Feb 11 but the design team decided not to review and =
submit any of its content (except for the structure) before the Feb 22 cuto=
ff.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">We s=
hould <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On 2021-03-10, 12:18 PM=
, &quot;spring&quot; &lt;spring-bounces@ietf.org&gt; wrote:<span style=3D"f=
ont-size:11.0pt"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-left:36.0pt;text-alig=
n:left"><br>
<br>
<span style=3D"font-size:11.0pt"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Hi=
 SPRING,<br>
<br>
First of all, I really appreciate the SR compression design team for their =
hard work.
<br>
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.
<br>
<br>
I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?<br=
>
<br>
Again, thanks to the contributions and looking forward to the results in th=
e near future.
<br>
<br>
Best regards,<br>
Fan<br>
<br>
[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00</span><o:p></o:p></p>
</div>
</body>
</html>

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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Results of SR compression analysis?
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Subject: Re: [spring] Results of SR compression analysis?
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(hit send too soon)
We should now work toward the targets Weiqiang mentioned during the meeting=
 for an April/May submission of the analysis text.

Thanks!
  Darren

On 2021-03-10, 2:40 PM, "Darren Dukes (ddukes)" <ddukes@cisco.com> wrote:

Hi Fan, I fixed the link in the minutes.
https://mailarchive.ietf.org/arch/msg/srcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/
  Thanks for drawing that to our attention.
That analysis was done on Feb 11 but the design team decided not to review =
and submit any of its content (except for the structure) before the Feb 22 =
cutoff.

We should



On 2021-03-10, 12:18 PM, "spring" <spring-bounces@ietf.org> wrote:



Hi SPRING,

First of all, I really appreciate the SR compression design team for their =
hard work.
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.

I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?

Again, thanks to the contributions and looking forward to the results in th=
e near future.

Best regards,
Fan

[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">(hit=
 send too soon)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">We s=
hould now work toward the targets Weiqiang mentioned during the meeting for=
 an April/May submission of the analysis text.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Than=
ks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p; Darren<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On 2021-03-10, 2:40 PM,=
 &quot;Darren Dukes (ddukes)&quot; &lt;ddukes@cisco.com&gt; wrote:<span sty=
le=3D"font-size:11.0pt"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-left:36.0pt;text-alig=
n:left"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">Hi Fan, I fixed the link in the minutes.</span><o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt"><a href=3D"https://mailarchive.ietf.org/arch/msg/s=
rcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/">https://mailarchive.ietf.org/arch/msg/s=
rcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/</a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp; Thanks for drawing that to our attention.</=
span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">That analysis was done on Feb 11 but the design te=
am decided not to review and submit any of its content (except for the stru=
cture) before the Feb 22 cutoff.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">We should
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">On 2021-03-10, 12:18 PM=
, &quot;spring&quot; &lt;spring-bounces@ietf.org&gt; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-left:72.0pt;text-alig=
n:left"><br>
<br>
<br>
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">Hi=
 SPRING,<br>
<br>
First of all, I really appreciate the SR compression design team for their =
hard work.
<br>
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.
<br>
<br>
I tried to get the answer of why this is empty from the meeting minutes(htt=
ps://codimd.ietf.org/notes-ietf-110-spring), and it seems that this has bee=
n discussed but the link in the minutes cannot work now. So anyone help?<br=
>
<br>
Again, thanks to the contributions and looking forward to the results in th=
e near future.
<br>
<br>
Best regards,<br>
Fan<br>
<br>
[1] https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-=
00</span><o:p></o:p></p>
</div>
</body>
</html>

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--=====_003_next=====--

--=====_002_next=====--

--=====_001_next=====--


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From: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>
To: "Darren Dukes (ddukes)" <ddukes=40cisco.com@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Results of SR compression analysis?
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi Darr=
en, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Many th=
anks for fixing the link. Now I can follow the link to figure out the progr=
ess.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Good lu=
ck to DT with further work!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Cheers,=
 <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Fan <o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
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<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
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ns-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span></span></b><span l=
ang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> spring [mailto:spring-bounces@ietf.org]
</span><b><span style=3D"font-size:11.0pt;font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B4=FA=B1=ED </span>
</b><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;=CE=A2=
=C8=ED=D1=C5=BA=DA&quot;,sans-serif">Darren Dukes (ddukes)<br>
</span><b><span style=3D"font-size:11.0pt;font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:<=
/span></span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family=
:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif"> 2021</span><span style=
=3D"font-size:11.0pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-=
serif">=C4=EA<span lang=3D"EN-US">3</span>=D4=C2<span lang=3D"EN-US">11</sp=
an>=C8=D5<span lang=3D"EN-US">
 3:44<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Yangfan (IP Standard) &lt;shirley.yangfan@huawei.com&gt;; spring@ie=
tf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> Re: [spring] Results of SR compression analysis?<o:p></o:p></span></span>=
</p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">(hit=
 send too soon)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">We s=
hould now work toward the targets Weiqiang mentioned during the meeting for=
 an April/May submission of the analysis text.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Than=
ks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p; Darren<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-CA">On=
 2021-03-10, 2:40 PM, &quot;Darren Dukes (ddukes)&quot; &lt;<a href=3D"mail=
to:ddukes@cisco.com">ddukes@cisco.com</a>&gt; wrote:</span><span lang=3D"EN=
-CA" style=3D"font-size:11.0pt"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-left:36.0pt;text-alig=
n:left"><span lang=3D"EN-CA" style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">Hi Fan, I fixed the link in the minutes.</span><sp=
an lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt"><a href=3D"https://mailarchive.ietf.org/arch/msg/s=
rcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/">https://mailarchive.ietf.org/arch/msg/s=
rcomp/ryOuYQbquExcmdi8a9KSNy4FAV4/</a></span><span lang=3D"EN-CA"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp; Thanks for drawing that to our attention.</=
span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">That analysis was done on Feb 11 but the design te=
am decided not to review and submit any of its content (except for the stru=
cture) before the Feb 22 cutoff.</span><span lang=3D"EN-CA"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><span lang=3D"EN-CA"><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">We should
</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><span lang=3D"EN-CA"><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><span lang=3D"EN-CA"><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11.0pt">&nbsp;</span><span lang=3D"EN-CA"><o:p></o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-CA">On=
 2021-03-10, 12:18 PM, &quot;spring&quot; &lt;<a href=3D"mailto:spring-boun=
ces@ietf.org">spring-bounces@ietf.org</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"mso-margin-top-alt:0cm;margi=
n-right:0cm;margin-bottom:12.0pt;margin-left:72.0pt;text-align:left">
<span lang=3D"EN-CA"><br>
<br>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">Hi=
 SPRING,<br>
<br>
First of all, I really appreciate the SR compression design team for their =
hard work.
<br>
But I found out the analysis results are empty in the analysis draft[1] as =
Xuesong pointed out at the meeting.
<br>
<br>
I tried to get the answer of why this is empty from the meeting minutes(<a =
href=3D"https://codimd.ietf.org/notes-ietf-110-spring">https://codimd.ietf.=
org/notes-ietf-110-spring</a>), and it seems that this has been discussed b=
ut the link in the minutes cannot
 work now. So anyone help?<br>
<br>
Again, thanks to the contributions and looking forward to the results in th=
e near future.
<br>
<br>
Best regards,<br>
Fan<br>
<br>
[1] <a href=3D"https://tools.ietf.org/html/draft-srcompdt-spring-compressio=
n-analysis-00">
https://tools.ietf.org/html/draft-srcompdt-spring-compression-analysis-00</=
a></span><span lang=3D"EN-CA"><o:p></o:p></span></p>
</div>
</body>
</html>

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From: Linda Dunbar <linda.dunbar@futurewei.com>
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Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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I have read the draft. I think it is very useful to have a solution that in=
tegrates the Network Server Header and the Segment routing.

I support the publication.

Linda Dunbar


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com<mailto:bruno.decraene@orange.com>
Sent: Wednesday, February 10, 2021 2:31 AM
To: spring@ietf.org<mailto:spring@ietf.org>
Cc: draft-ietf-spring-nsh-sr@ietf.org<mailto:draft-ietf-spring-nsh-sr@ietf.=
org>
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]=
.

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr<https://nam11.safe=
links.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fd=
raft-ietf-spring-nsh-sr&data=3D04%7C01%7Clinda.dunbar%40futurewei.com%7C810=
b29e52e2d4d6c694008d8e21439c5%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C=
637507923815289125%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu=
MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DFDX50G52uv%2BON5wiuxGYy5n=
4DSIvYY5CLomkngoMylU%3D&reserved=3D0>

--Bruno


___________________________________________________________________________=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I have read the draft. I think =
it is very useful to have a solution that integrates the Network Server Hea=
der and the Segment routing.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I support the publication. <o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Linda Dunbar<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D;mso-fa=
reast-language:ZH-CN"><o:p>&nbsp;</o:p></span></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"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> spring [<a href=3D"ma=
ilto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b><a href=3D"mailto:bruno.decraene@orange.com">bruno.decr=
aene@orange.com</a><br>
<b>Sent:</b> Wednesday, February 10, 2021 2:31 AM<br>
<b>To:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-spring-nsh-sr@ietf.org">draft-ietf-=
spring-nsh-sr@ietf.org</a><br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I&#8217;ll forward th=
at call to the SFC WG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">Thanks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">[1] <a href=3D"https://nam11.safel=
inks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdr=
aft-ietf-spring-nsh-sr&amp;data=3D04%7C01%7Clinda.dunbar%40futurewei.com%7C=
810b29e52e2d4d6c694008d8e21439c5%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1=
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https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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Hi Ketan

I have been following this draft as it has progressed and had gone a long
ways and has matured.  Document is very well written.

A few comments on the draft.

Thank you

Section 2

Why is MVPN SAFI 129 RFC 6513 6514 out of scope for this document?

Just as we have BGP Prefix SID Attribute SRv6 L3 services TLV type 5 and
SRv6 L2 services type 6 could MVPN be encoded as type 7 maybe?

       SRv6 L3 Service TLV: This TLV encodes Service SID information for
      SRv6 based L3 services.  It corresponds to the equivalent
      functionality provided by an MPLS Label when received with a Layer
      3 service route as defined in [RFC4364
<https://datatracker.ietf.org/doc/html/rfc4364>] [RFC4659
<https://datatracker.ietf.org/doc/html/rfc4659>] [RFC8950
<https://datatracker.ietf.org/doc/html/rfc8950>]

      [I-D.ietf-bess-evpn-prefix-advertisement
<https://datatracker.ietf.org/doc/html/draft-ietf-bess-srv6-services-06#ref=
-I-D.ietf-bess-evpn-prefix-advertisement>].
Some behaviors which
      MAY be encoded, but not limited to, are End.DX4, End.DT4, End.DX6,
      End.DT6, etc.


Can we mention here that the 20 byte VPN label is encoded in function
field of SRv6 SID.  Above is L3 VPN label so should the L2 EVPN

draft be omitted as it=E2=80=99s mentioned below as well in reference to L2=
 service.


      SRv6 L2 Service TLV: This TLV encodes Service SID information for
      SRv6 based L2 services.  It corresponds to the equivalent
      functionality provided by an MPLS Label1 for EVPN Route-Types as
      defined in [RFC7432
<https://datatracker.ietf.org/doc/html/rfc7432>].  Some behaviors
which MAY be encoded, but
      not limited to, are End.DX2, End.DX2V, End.DT2U, End.DT2M etc.


Can we mention here that the 20 byte VPN label is encoded in function
field of SRv6 SID


Section 5


Would the VPN label be encoded in SRv6 SID in both Function / Arg and
not just Arg.  The VPN label is only 20 bytes and the

station ID is 64 bytes, however since the Func/Arg field is variable
length should we say Func/Arg to provide flexibility in the encoding.


Section 5.1
Section 5.1 can we mention RFC 5565 softwire mesh framework as it relates
to V4 over v6 core.

Rewrite:

The MP_REACH_NLRI AFI/SAFI 1/128 IPv4 NLRI over SRv6 core next hop is
encoded as defined in [RFC8950
<https://datatracker.ietf.org/doc/html/rfc8950>] as 24 or 48 byte IPv6
addresswith RD set to 0.


Section 5.3


Rewrite


The MP_REACH_NLRI AFI/SAFI 2/128 IPv6  NLRI over SRv6 core next hop
encoded asdefined in [RFC4659
<https://datatracker.ietf.org/doc/html/rfc4659>] as 24 or 48 byte
IPv6 address with RD set to 0.



Section 5.3
Rewrite

The MP_REACH_NLRI AFI/SAFI 1/4 BGP labeled unicast (4PE), IPv4 islands
over SRv6 core next hop is encoded as defined in [RFC8950
<https://datatracker.ietf.org/doc/html/rfc8950>] as 16 or 32 byte IPv6
address.


Section 5.4

Rewrite

The MP_REACH_NLRI AFI/SAFI 2/1 IPv6 NLRI over SRv6 core next hop is
encoded according to [RFC2545
<https://datatracker.ietf.org/doc/html/rfc2545>]



Kind Regards

Gyan


On Wed, Mar 10, 2021 at 11:04 AM Ketan Talaulikar (ketant) <ketant=3D
40cisco.com@dmarc.ietf.org> wrote:

> Hi Sasha,
>
>
>
> Indeed your version is better and we=E2=80=99ll put that in on the next d=
raft
> update.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
> *Sent:* 10 March 2021 19:40
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>; rtg-dir@ietf.org; <rtg-ads@ietf.org> <
> rtg-ads@ietf.org>
> *Subject:* RE: RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> Ketan,
>
> From my POV an even better version would be =E2=80=9C*Usage of multicast =
trees as
> P-tunnels is outside the scope of this document*=E2=80=9D.
>
> But your proposed text is also OK with me.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@rbbn.com
>
>
>
> *From:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Sent:* Wednesday, March 10, 2021 4:07 PM
> *To:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>; rtg-dir@ietf.org; <rtg-ads@ietf.org> <
> rtg-ads@ietf.org>
> *Subject:* RE: RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> *NOTICE:* This email was received from an *EXTERNAL* sender.
>
>
>
> Hi Sasha,
>
>
>
> My apologies and I think I understand your point. Would the following tex=
t
> change convey the right meaning?
>
>
>
> s/ *The setup of multicast trees for use as P-tunnels is outside the
> scope of this document / The setup and usage of multicast trees as
> P-tunnels is outside the scope of this document*
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
> *Sent:* 10 March 2021 16:15
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>; rtg-dir@ietf.org; <rtg-ads@ietf.org> <
> rtg-ads@ietf.org>
> *Subject:* RE: RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> Ketan,
>
> Lots of thanks for posting an updated version of the draft.
>
>
>
> I have looked it up, and it seems that the majority of my review comments
> have been addressed.
>
>
>
> I defer to the Routing ADs regarding my metadata comments.
>
>
>
> One point that, IMHO, requires additional clarification, is restriction o=
f
> EVPN to just ingress replication for delivery of BUM traffic.
>
> As I see it, stating that =E2=80=9C*The setup of multicast trees for use =
as
> P-tunnels is outside the scope of this document*=E2=80=9D   does not full=
y
> address this issue because, to the best of my understanding, RFC 8986 doe=
s
> not define any endpoint behavior that could be used for delivery of EVPN
> BUM traffic via P2MP trees even if such were supported (seems pretty
> evident if aggregate multicast trees are used, but even non-aggregate
> multicast trees are not covered IMHO).
>
>
>
> Please see also more comments to your responses *inline below*.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@rbbn.com
>
>
>
> *From:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Sent:* Wednesday, March 10, 2021 7:55 AM
> *To:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; <
> rtg-ads@ietf.org> <rtg-ads@ietf.org>
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>; rtg-dir@ietf.org
> *Subject:* RE: RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> *NOTICE:* This email was received from an *EXTERNAL* sender.
>
>
>
> Hi Sasha,
>
>
>
> Thanks a lot for your detailed review, your comments/feedback and for
> taking time for discussions with the co-authors for their resolution.
>
>
>
> We=E2=80=99ve just posted an update of the draft to address your comments=
 based on
> our discussions :
>
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-bess-srv6-services-06
> <https://clicktime.symantec.com/3UsxW3phCpdUtwJLUsoiuXP6H2?u=3Dhttps%3A%2=
F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-bess-srv6-services-06>
>
>
>
> Please see inline below for individual responses.
>
>
>
> *From:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
> *Sent:* 29 January 2021 16:20
> *To:* rtg-ads@ietf.org
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>; rtg-dir@ietf.org
> *Subject:* RE: RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> Adding RTG-DIR =E2=80=93 my apologies
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@rbbn.com
>
>
>
> *From:* Alexander Vainshtein
> *Sent:* Friday, January 29, 2021 12:46 PM
> *To:* rtg-ads@ietf.org
> *Cc:* draft-ietf-bess-srv6-services.all@ietf.org; bess@ietf.org;
> spring@ietf.org; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>; Zafar
> Ali (zali) <zali@cisco.com>
> *Subject:* RTG-DIR review of draft-ietf-bess-srv6-services-05
>
>
>
> Hello,
>
>
>
> I have been selected as the Routing Directorate reviewer for this draft.
> The Routing Directorate seeks to review all routing or routing-related
> drafts as they pass through IETF last call and IESG review, and sometimes
> on special request. The purpose of the review is to provide assistance to
> the Routing ADs. For more information about the Routing Directorate, plea=
se
> see =E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
> <https://clicktime.symantec.com/3DNHqu2P3uB4FTvdUETxnRQ6H2?u=3Dhttp%3A%2F=
%2Ftrac.tools.ietf.org%2Farea%2Frtg%2Ftrac%2Fwiki%2FRtgDir>
>
>
>
> Although these comments are primarily for the use of the Routing ADs, it
> would be helpful if you could consider them along with any other IETF Las=
t
> Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>
>
>
> Document: draft-ietf-bess-srv6-services-05
>
> Reviewer: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein
>
> Review Date: 29-Jan-21
>
> IETF LC End Date:  Not known
>
> Intended Status: Standards Track
>
>
>
> *Summary*:
>
> I have some minor concerns about this document that I think should be
> resolved before publication.
>
>
>
> *Comments*:
>
> The draft is well written and it was relatively easy to grasp the main
> idea behind it. However, the draft has to be read in parallel with the SR=
v6
> Network Programming draft
> <https://clicktime.symantec.com/3Muuyg43iWUsicfqWidGKhk6H2?u=3Dhttps%3A%2=
F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-srv6-network-prog=
ramming-28>
> due to a lot of references to specific SRv6 endpoint behaviors defined in
> this draft.
>
>
>
> From my POV the draft introduces a new approach to providing BGP-based
> services over an IPv6-capable core that is quite different from the way
> such services have been provided over IP/MPLS cores .  It would be nice  =
if
> the authors could  present these differences in a more explicit way and
> clarify their impact on such issues as inter-AS/inter-domain services,
> scalability etc. However this is just a wish, not a concern.
>
>
>
> I have presented my early comments to the authors and contributors to the
> draft, and we have hold a series of productive  discussions that, from my
> POV, resulted in reaching rough consensus regarding resolution of all the
> issues I have raised.
>
>
>
> I have included my understanding of the authors=E2=80=99 responses in the=
 body of
> the review (marked by *italics*), and will be waiting for the next
> revision of the draft for addressing these comments along the agreed upon
> lines.
>
>
>
> I would like express my gratitude to Gaurav, Swadesh and Zafar  for their
> responsiveness and cooperation.
>
>
>
> *Major Issues*: None found
>
>
>
> *Minor Issues*:
>
>    1. It is quite common to say that the SRv6 dataplane is defined by RFC
>    8754m and this common statement is repeated in the first line of the S=
Rv6
>    Services draft. However. I am not sure whether  RFC 8754, by and of it=
self,
>     is a sufficient reference for the SRv6 dataplane  *for the purpose of
>    this  document*. My doubts are based on the following:
>
>
>    1. RFC 8754 defines the Segment Routing header (SRH) and its handling
>       2. The draft explicitly states that best-effort BGP-based services
>       over an SRv6 domain can be provided without SRH =E2=80=93 but they =
definitely would
>       use the SRv6 dataplane
>
> *[KT] RFC8754 does indeed define the SRH and hence specifies the SRv6 dat=
a
> plane in conjunction with RFC8402. Even when SRH is not used (refer RFC
> 8754 Sec 4.1.1 and RFC 8986 Sec 5.1 & 5.2), the processing follows RFC 87=
54
> and RFC 8986 since the IPv6 DA in the packet is set to the specific SRv6
> SID. Hence, the references to these two specifications in addition to
> RFC8402.*
>
>
>
> My guess is that the  primary reference for the SRv6 dataplane for this
> draft is provided by the SRv6 Network Programming draft and augmented by
> RFC 8754. This guess is aligned with the frequent references to the SRv6
> Network Programming draft in the SRv6 Services draft.
>
> *[KT] Your understanding is correct here as clarified in the previous
> response and we have updated the text to better reflect the use of SRv6
> Service SID alone for best effort and then the use of SRH as well.*
>
> *[[Sasha]] The new version refers to RFC 8402 for the definition of SRv6,
> which is OK with me.*
>
>
>
> I defer to the ADs and the leaders of the SPRING WG to decide how this
> issue should be resolved
>
>    1. The draft explicitly states in Section 2 that it =E2=80=9Cextends t=
he BGP
>    Prefix-SID attribute [RFC8669] to carry  SRv6 SIDs and associated
>    information=E2=80=9D. However, the draft:
>
>
>    1. Does not explicitly states that that  it also extends RFC 8669 by
>       allowing BGP Prefix SID to be used with new AFI/SAFI (VPN-v4, VPN-v=
6 and
>       EVPN) anywhere in the text (RFC 8669 is explicitly limited to IPv4/=
IPv6
>       Labeled Unicast leaving usage of the BGP Prefix SID attribute with =
other
>       AFI/SAFI out of scope)
>
> *[KT] Agree =E2=80=93 we have clarified this in the text.[[Sasha]] Yes, l=
ots of
> thanks. *
>
>
>
>    1. Is not marked as updating RFC 8669 in the metadata
>
> *[KT] I am not sure this is necessary since it does not really =E2=80=9Cu=
pdate=E2=80=9D
> the processing or handling of the feature specified in RFC8669 =E2=80=93 =
this draft
> just re-uses the attribute introduced there.[[Sasha]] I defer to the ADs =
to
> decide whether such marking is or is not required.*
>
>
>
>    1. To the. best of my understanding *the authors do not object to
>       explicitly clarifying that this draft extends RFC 8669 also by appl=
ying it
>       to new AFI/SAFI*. I believe that it would be up to the Routing ADs
>       to decide whether draft should be marked as updating RFC 8669 in th=
e
>       metadata
>       2. I also wonder whether this draft should not be considered as
>       updating RFC 4364 and RFC 4659 because it suggests carrying, in the=
 Label
>       field of the NLRI of the routes defined in these documents, values =
that do
>       not represent MPLS labels (or represent special purpose values that=
 are
>       used in these fields). The same applies to RFC 7432  - but to a les=
ser
>       extent since this document allows carrying VNI values as well as MP=
LS
>       labels. I defer to the Routing ADs to decide how this should be han=
dled
>
> *[KT] Let us take an example, RFC8365 introduced new dataplane support fo=
r
> EVPN (RFC7432) using VXLAN (and others) but allowing VNI to be carried in
> the MPLS label fields of RFC7432. However, RFC8365 does not update RFC743=
2.
> We have a similar case, where a new dataplane (feature) is being specifie=
d
> for use with existing BGP services.[[Sasha]] Same as above. *
>
>
>
>    1. Section 3 states: =E2=80=9CImplementations supporting this specific=
ation
>    SHOULD provide a mechanism to control advertisement of SRv6-based BGP
>    service routes on a per neighbor and per service basis=E2=80=9D.
>
>
>    1. The purpose of this recommendation is prevention of
>       misinterpretation by the BGP speakers that do not support the draft=
, of the
>       label fields of the service routes as referring to MPLS labels whil=
e in
>       fact these fields carry transposed parts of the SRv6 Service SIDs
>       2. I would like to understand how advertisement of SRv6 Service
>       routes to non-compliant PEs by BGP Route Reflectors can be prevente=
d if
>
>                                                     i.     The  clients
> of these Route Reflectors include both compliant and non-compliant PEs
>
>                                                    ii.     The Route
> Reflectors also do not recognize BGP Prefix SID
>
>    1. *The authors have agreed to clarify that the mechanisms for
>       prevention are implementation- and/or deployment-specific and  will=
 provide
>       an example of a suitable BGP policy*. From my POV this would be
>       most useful
>
> *[KT] As discussed, there are different approaches and mechanisms possibl=
e
> for BGP policy that are deployment design specific and better covered in =
a
> separate document. We have clarified this in the text.*
>
> *[[Sasha]] The new text simply leaves the solution out of scope. If a
> non-normative example could be added, it would be nice IMHO.*
>
>
>
>    1. I have not found any references to multicast in MPLS/BGP IP VPNs
>    (RFC 6513) in the draft. Neither is the SR Replication Segment for
>    Multi-point Service Delivery draft
>    <https://clicktime.symantec.com/32TG19gUV4Lj31a5gjgAQYu6H2?u=3Dhttps%3=
A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-sr-replication=
-segment-03>
>    mentioned anywhere. It is not clear to me whether such services cannot=
 be
>    supported over SRv6, or are left for future study. Clarifying this poi=
nt
>    would be quite helpful IMHO*. In our discussion the authors have
>    stated that MVPN is out of scope of the draft and would be covered by =
a
>    different document*
>
> *[KT] You are correct; MVPN and P2MP SRv6 are going to be covered in
> separate documents. We have clarified this in the text.[[Sasha]] The new
> text is OK. *
>
>
>
>    1. It is my impression that delivery of BUM traffic over EVPN services
>    as defined in the draft is limited to ingress replication as the provi=
der
>    tunneling technology:
>
>
>    1. This impression is based on the following observations:
>
>                                                     i.     According to
> Section 8.3.1.2  of RFC 7432, in the case of provider tunneling
> technologies that are different from ingress replication,  the ESI label =
is
> upstream-assigned by the advertising PE and has to be interpreted by the
> egress PEs in the context of the ingress PE that, in its turn, has to be
> inferred from the identification of the P2MP tunnel over which the packet
> containing the EVPN-encapsulated BUM frame has been received by the egres=
s
> PE
>
>                                                    ii.     The definition
> of the End.DT2M behavior in the SRv6 Network Programming draft requires
> association of specific outgoing interfaces in the L2 outgoing interfaces
> of the corresponding table in the egress PE with specific Arg.FE2 values
> and encoding these values in the SRv6 SIDs associated with this behavior.
> Such association presumably does not depend on specific ingress PEs
>
>                                                   iii.     Neither the
> SRv6 Network Programming draft for the SRv6 Services one provide any
> details about inferring the context for the upstream-assigned ESI labels
> from the received SRv6 SIDs.
>
>    1. If my understanding is correct, such a limitation should be
>       explicitly stated in the draft. In our discussion the authors have =
stated
>       that P2MP SRv6 trees is out of scope of the draft and would be cove=
red by a
>       different document. *It is my understanding that the authors would
>       not object to such a clarification*
>
> *[KT] The draft does have the following text at the end of Sec 6.3 =E2=80=
=93 =E2=80=9CThe
> setup of multicast trees for use as P-tunnels is outside the scope of thi=
s
> document.=E2=80=9D*
>
> *[[Sasha]] I still think that an explicit statement that the draft is
> limited to ingress replication for EVPN is required because, to the best =
of
> my understanding, RFC 8986
> <https://clicktime.symantec.com/a/1/biKp1AfoqwCVjtqxg5_vLdEMaWnvI4M-LJJtO=
F_BtLA=3D?d=3DGveeddDdNDsKHR-czb3Wltcci3Ee7a8MY3Vhln8iQrgFexk1L1augTK1ls8B3=
BDL5bP_EzXeteWybZLr99fehzgcX5ynSev6sool_xo1KVsd4RYsdlyoqeQ7bDwRziDkG3Ed4HWP=
-il5lzxmQqZK46RIp-Fw1tghrJcrgvGpRNsYvrSJB7JNnnuS3-oVARnTg-JeBNgiukrdul4BQO0=
hBszmhO1SCm9TJcgl34O-2OWt5jD6v4kyOnBKF2R35Q25T21RcJp28zIJPGY5M9cJdeahRwe5it=
29BQ_ipGOVfT9prRfz67VJ2D8471XyHhA3cZ9A2PFf9AqwEolwHDhY01XHc4IOUbc8a_9Dd7fCW=
G4Ygt2r8uME-Pv9kO3IxbhlcYNHHIlLL96J1at9Md_83GYTAJ28a5D7ze64nO23oPzGM8sMlN16=
KRoKz8i5CybmlVmZNYTwt6MoW0xPjAs4QE2Wpui3QvNtnIoBMOGe&u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fhtml%2Frfc8986>
> does not define a suitable endpoint behavior. Did I miss something here?*
>
>
>
>    1. When it comes to usage of ingress replication in EVPN, my guess
>       (FIIW) is that EVPN over SRv6 that uses ingress replication would b=
e fully
>       compatible with the Assisted Ingress Replication scheme as describe=
d in the Optimized
>       Ingress Replication for EVPN
>       <https://clicktime.symantec.com/3SvJDuvNrUXrGUuf6hsEZn16H2?u=3Dhttp=
s%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-bess-evpn-optimize=
d-ir-07>
>       draft. If this is indeed so, it would be useful if this fact were
>       explicitly mentioned in the draft (with an Informative reference to=
 the
>       Optimized Ingress Replication draft). *In our discussion the
>       authors stated that the draft is fully compatible with the Assisted
>       replication scheme  just as any other IP-based encapsulation*
>
> *[KT] You are correct about the applicability of that draft to SRv6 based
> BGP services.* *There are other EVPN extensions/procedures which also
> apply and it may be misleading to include and discuss one of them and not
> cover the others.[[Sasha]] Well, I can live with that. *
>
>
>
>    1. The draft defines two schemes for encoding the actual service SID
>    in the labeled service routes:
>
>
>    1. The entire SRv6 SID encoded in the BGP Prefix SID attribute
>       combined with Implicit NULL as the label in the NLRI of the route
>       2. The Transposition Scheme: Only the locator part of the SRv6 SID
>       encoded in the BGP Prefix SID attribute while the function and argu=
ments
>       (if any) are encoded as the label field of the NLRI.
>       3. Neither of these schemes is defined as MANDATORY, but the
>       Transposition Scheme is RECOMMENDED as providing more efficient pac=
king
>       4. To the best of my understanding, the egress PE can use any of
>       these schemes at its discretion when it advertises the service rout=
es. Is
>       this correct? If yes, does this mean that the ingress PE MUST suppo=
rt both
>       schemes? *In our discussion the authors have confirmed that*
>
> *[KT] This is correct.*
>
>
>
>    1. I have to admit that I do not fully understand why the
>       Transposition Scheme is more effective since eventually the same se=
t of
>       Service SIDs has to be allocated and advertised by the egress PEs; =
but this
>       is probably my personal problem.
>
> *[KT] The efficiency is not in the context of Service SID allocation, but
> in the packing efficiency of the BGP updates.[[Sasha]] Got it now, thanks=
 a
> lot! *
>
>
>
>    1. The last para of Section 4 the draft (that discusses per Ethernet
>    Segment EVPN Auto-Discovery route), says that the =E2=80=9Cargument pa=
rt of
>    the SRv6 SID MAY be transposed in the ESI Label field of the ESI Label
>    Extended Community and the SID value in the SRv6 Services TLV is set t=
o 0
>    with the SRv6 SID Structure Sub-Sub-TLV=E2=80=9D. From my POV:
>
>
>    1. There is no other place where this argument can be transposed =E2=
=80=93
>       because, as per RFC 7432, the Label filed of this route MUST be set=
 to 0
>
> *[KT] Correct.*
>
>    1. In the general situation (when the Egress PE is attached to
>       multiple multi-homed Ethernet Segments and contains multiple MAC-VR=
Fs
>       attached to these segments) the Arg.FE2 value (that is assigned per=
 ES and
>       carried with the per-ES Ethernet A-D route) MUST be combined with t=
he
>       Function part of the SRv6 Service SID (that is allocated per Bridge=
 Table
>       and advertised in the Inclusive Multicast Ethernet Tag EVPN route) =
using
>       the Transposition scheme.
>       2. I also think that consistent usage of the Transposition Scheme
>       (i.e., same offset and length) across multiple EVPN routes is requi=
red. *It
>       is my understanding that the authors agree that consistent usage of=
 the
>       Transposition Scheme across multiple ES and multiple EVI is expecte=
d*
>
> *[KT] This is also correct.* *The procedure is explained in Sec 6.3.*
>
>    1. Both the SRv6 Network Programming draft and the SRv6 Services draft
>    use notation Arg.FE2, but I have not found any definition of this nota=
tion. *According
>    to the authors, these two drafts define this notation and no additiona=
l
>    definition is required, and agreed to state that explicitly in the dra=
ft*.
>
>
> *[KT] The definition of this notation is indeed in RFC8986 Sec 4.12 and
> this draft specifies how it is advertised via BGP. We have clarified this
> in the text.[[Sasha]]  Yes, OK with me.*
>
>
>
>
>
> *Nits*:
>
>    1. I did not run the nits check on the draft
>    2. In the 3rd para of Section 1: s/one of the service specific behavio=
r/
>    one of the service specific behaviors/
>
> *[KT] Ack for both.*
>
>
>
> *Thanks,*
>
> *Ketan (on behalf of co-authors)*
>
>
>
>
>
> Hopefully these notes will be useful.
>
>
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@rbbn.com
>
>
>
>
> Notice: This e-mail together with any attachments may contain information
> of Ribbon Communications Inc. and its Affiliates that is confidential
> and/or proprietary for the sole use of the intended recipient. Any review=
,
> disclosure, reliance or distribution by others or forwarding without
> express permission is strictly prohibited. If you are not the intended
> recipient, please notify the sender immediately and then delete all copie=
s,
> including any attachments.
>
>
> Notice: This e-mail together with any attachments may contain information
> of Ribbon Communications Inc. and its Affiliates that is confidential
> and/or proprietary for the sole use of the intended recipient. Any review=
,
> disclosure, reliance or distribution by others or forwarding without
> express permission is strictly prohibited. If you are not the intended
> recipient, please notify the sender immediately and then delete all copie=
s,
> including any attachments.
>
>
> Notice: This e-mail together with any attachments may contain information
> of Ribbon Communications Inc. and its Affiliates that is confidential
> and/or proprietary for the sole use of the intended recipient. Any review=
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--=20

<http://www.verizon.com/>

*Gyan Mishra*

*Network Solutions A**rchitect *



*M 301 502-134713101 Columbia Pike *Silver Spring, MD

--00000000000091579305bd83cc0e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div><br></div><div dir=3D"auto">Hi Ketan</div><div dir=3D"auto"><br></div>=
<div dir=3D"auto">I have been following this draft as it has progressed and=
 had gone a long ways and has matured.=C2=A0 Document is very well written.=
</div><div dir=3D"auto"><br></div><div dir=3D"auto">A few comments on the d=
raft.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Thank you=C2=A0</d=
iv><div dir=3D"auto"><br></div><div dir=3D"auto">Section 2</div><div dir=3D=
"auto"><br></div><div dir=3D"auto">Why is MVPN SAFI 129 RFC 6513 6514 out o=
f scope for this document?</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">Just as we have BGP Prefix SID Attribute SRv6 L3 services TLV type 5 and=
 SRv6 L2 services type 6 could MVPN be encoded as type 7 maybe? =C2=A0</div=
><div dir=3D"auto"><br></div><div dir=3D"auto"><pre class=3D"newpage" style=
=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:page;font-f=
amily:monospace" dir=3D"auto">       SRv6 L3 Service TLV: This TLV encodes =
Service SID information for
      SRv6 based L3 services.  It corresponds to the equivalent
      functionality provided by an MPLS Label when received with a Layer
      3 service route as defined in [RF<a href=3D"https://datatracker.ietf.=
org/doc/html/rfc4364" title=3D"&quot;BGP/MPLS IP Virtual Private Networks (=
VPNs)&quot;" style=3D"font-size:1em;font-family:monospace">C4364</a><span s=
tyle=3D"font-size:1em;font-family:monospace;border-color:rgb(0,0,0)">] [</s=
pan><a href=3D"https://datatracker.ietf.org/doc/html/rfc4659" title=3D"&quo=
t;BGP-MPLS IP Virtual Private Network (VPN) Extension for IPv6 VPN&quot;" s=
tyle=3D"font-size:1em;font-family:monospace">RFC4659</a><span style=3D"font=
-size:1em;font-family:monospace;border-color:rgb(0,0,0)">] [</span><a href=
=3D"https://datatracker.ietf.org/doc/html/rfc8950" title=3D"&quot;Advertisi=
ng IPv4 Network Layer Reachability Information (NLRI) with an IPv6 Next Hop=
&quot;" style=3D"font-size:1em;font-family:monospace">RFC8950</a><span styl=
e=3D"font-size:1em;font-family:monospace;border-color:rgb(0,0,0)">]</span><=
/pre><pre class=3D"newpage" style=3D"font-size:1em;margin-top:0px;margin-bo=
ttom:0px;break-before:page;font-family:monospace" dir=3D"auto">      [<a hr=
ef=3D"https://datatracker.ietf.org/doc/html/draft-ietf-bess-srv6-services-0=
6#ref-I-D.ietf-bess-evpn-prefix-advertisement" style=3D"font-family:monospa=
ce">I-D.ietf-bess-evpn-prefix-advertisement</a>].  Some behaviors which
      MAY be encoded, but not limited to, are End.DX4, End.DT4, End.DX6,
      End.DT6, etc.</pre><pre class=3D"newpage" style=3D"font-size:1em;marg=
in-top:0px;margin-bottom:0px;break-before:page;font-family:monospace"><br><=
/pre><pre class=3D"newpage" style=3D"font-size:1em;margin-top:0px;margin-bo=
ttom:0px;break-before:page;font-family:monospace" dir=3D"auto">Can we menti=
on here that the 20 byte VPN label is encoded in function field of SRv6 SID=
.  Above is L3 VPN label so should the L2 EVPN</pre><pre class=3D"newpage" =
style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:page;f=
ont-family:monospace" dir=3D"auto">draft be omitted as it=E2=80=99s mention=
ed below as well in reference to L2 service.</pre><pre class=3D"newpage" st=
yle=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:page;fon=
t-family:monospace"><br></pre><pre class=3D"newpage" style=3D"font-size:1em=
;margin-top:0px;margin-bottom:0px;break-before:page;font-family:monospace">=
<pre class=3D"newpage" style=3D"font-size:1em;margin-top:0px;margin-bottom:=
0px;break-before:page;font-family:monospace" dir=3D"auto">      SRv6 L2 Ser=
vice TLV: This TLV encodes Service SID information for
      SRv6 based L2 services.  It corresponds to the equivalent
      functionality provided by an MPLS Label1 for EVPN Route-Types as
      defined in [<a href=3D"https://datatracker.ietf.org/doc/html/rfc7432"=
 title=3D"&quot;BGP MPLS-Based Ethernet VPN&quot;" style=3D"font-family:mon=
ospace">RFC7432</a>].  Some behaviors which MAY be encoded, but
      not limited to, are End.DX2, End.DX2V, End.DT2U, End.DT2M etc.</pre><=
/pre></div><div dir=3D"auto"><br></div><div dir=3D"auto"><pre class=3D"newp=
age" dir=3D"auto" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;b=
reak-before:page;font-family:monospace;border-color:rgb(0,0,0)">Can we ment=
ion here that the 20 byte VPN label is encoded in function field of SRv6 SI=
D</pre><pre class=3D"newpage" dir=3D"auto" style=3D"font-size:1em;margin-to=
p:0px;margin-bottom:0px;break-before:page;font-family:monospace;border-colo=
r:rgb(0,0,0)"><br></pre><pre class=3D"newpage" dir=3D"auto" style=3D"font-s=
ize:1em;margin-top:0px;margin-bottom:0px;break-before:page;font-family:mono=
space;border-color:rgb(0,0,0)">Section 5</pre><pre class=3D"newpage" dir=3D=
"auto" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before=
:page;font-family:monospace;border-color:rgb(0,0,0)"><br></pre><pre class=
=3D"newpage" dir=3D"auto" style=3D"font-size:1em;margin-top:0px;margin-bott=
om:0px;break-before:page;font-family:monospace;border-color:rgb(0,0,0)">Wou=
ld the VPN label be encoded in SRv6 SID in both Function / Arg and not just=
 Arg.  The VPN label is only 20 bytes and the </pre><pre class=3D"newpage" =
dir=3D"auto" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-=
before:page;font-family:monospace;border-color:rgb(0,0,0)">station ID is 64=
 bytes, however since the Func/Arg field is variable length should we say F=
unc/Arg to provide flexibility in the encoding.</pre><div dir=3D"auto"><br>=
</div><div dir=3D"auto">Section 5.1=C2=A0</div><div dir=3D"auto">Section 5.=
1 can we mention RFC 5565 softwire mesh framework as it relates to V4 over =
v6 core.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Rewrite:</div><=
div dir=3D"auto"><pre class=3D"newpage" style=3D"font-size:1em;margin-top:0=
px;margin-bottom:0px;break-before:page;font-family:monospace" dir=3D"auto">=
The MP_REACH_NLRI AFI/SAFI 1/128 IPv4 NLRI <span style=3D"font-size:1em;fon=
t-family:monospace">over SRv6 core next hop is encoded as </span><span styl=
e=3D"font-size:1em;font-family:monospace">defined in [</span><a href=3D"htt=
ps://datatracker.ietf.org/doc/html/rfc8950" title=3D"&quot;Advertising IPv4=
 Network Layer Reachability Information (NLRI) with an IPv6 Next Hop&quot;"=
 style=3D"font-size:1em;font-family:monospace">RFC8950</a><span style=3D"fo=
nt-size:1em;font-family:monospace">] as 24 or 48 byte IPv6 addresswith RD s=
et to 0.</span></pre><pre class=3D"newpage" style=3D"font-size:1em;margin-t=
op:0px;margin-bottom:0px;break-before:page;font-family:monospace" dir=3D"au=
to"><span style=3D"font-size:1em;font-family:monospace"><br></span></pre><p=
re class=3D"newpage" style=3D"font-size:1em;margin-top:0px;margin-bottom:0p=
x;break-before:page;font-family:monospace" dir=3D"auto"><span style=3D"font=
-size:1em;font-family:monospace">Section 5.3</span></pre><pre class=3D"newp=
age" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:p=
age;font-family:monospace" dir=3D"auto"><span style=3D"font-size:1em;font-f=
amily:monospace"><br></span></pre><pre class=3D"newpage" style=3D"font-size=
:1em;margin-top:0px;margin-bottom:0px;break-before:page;font-family:monospa=
ce" dir=3D"auto"><span style=3D"font-size:1em;font-family:monospace">Rewrit=
e </span></pre><pre class=3D"newpage" style=3D"font-size:1em;margin-top:0px=
;margin-bottom:0px;break-before:page;font-family:monospace" dir=3D"auto"><s=
pan style=3D"font-size:1em;font-family:monospace"><pre class=3D"newpage" st=
yle=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:page;fon=
t-family:monospace"><br></pre><pre class=3D"newpage" style=3D"font-size:1em=
;margin-top:0px;margin-bottom:0px;break-before:page;font-family:monospace" =
dir=3D"auto">The MP_REACH_NLRI AFI/SAFI 2/128 IPv6  NLRI over SRv6 core nex=
t hop encoded asdefined in [<a href=3D"https://datatracker.ietf.org/doc/htm=
l/rfc4659" title=3D"&quot;BGP-MPLS IP Virtual Private Network (VPN) Extensi=
on for IPv6 VPN&quot;" style=3D"font-family:monospace">RFC4659</a>] as 24 o=
r 48 byte  IPv6 address with RD set to 0.
</pre><br class=3D"Apple-interchange-newline" style=3D"white-space:normal">=
</span></pre><br class=3D"Apple-interchange-newline" style=3D"-webkit-tap-h=
ighlight-color: rgba(26, 26, 26, 0.3); -webkit-text-size-adjust: auto;"></d=
iv></div><div dir=3D"auto">Section 5.3</div><div dir=3D"auto">Rewrite=C2=A0=
</div><div dir=3D"auto"><br></div><div dir=3D"auto"><pre class=3D"newpage" =
style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:page;f=
ont-family:monospace" dir=3D"auto">The MP_REACH_NLRI AFI/SAFI 1/4 BGP label=
ed unicast (4PE), IPv4 islands over SRv6 core next hop is encoded as define=
d in [<a href=3D"https://datatracker.ietf.org/doc/html/rfc8950" title=3D"&q=
uot;Advertising IPv4 Network Layer Reachability Information (NLRI) with an =
IPv6 Next Hop&quot;" style=3D"font-family:monospace">RFC8950</a>] as 16 or =
32 byte IPv6 address.</pre></div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Section 5.4</div><div dir=3D"auto"><br></div><div dir=3D"auto">Rewrite=
=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto"><pre class=3D"new=
page" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;break-before:=
page;font-family:monospace" dir=3D"auto">The MP_REACH_NLRI AFI/SAFI 2/1 IPv=
6 NLRI over SRv6 core next hop is encoded according to [<a href=3D"https://=
datatracker.ietf.org/doc/html/rfc2545" title=3D"&quot;Use of BGP-4 Multipro=
tocol Extensions for IPv6 Inter-Domain Routing&quot;" style=3D"font-family:=
monospace">RFC2545</a>]
</pre><br class=3D"Apple-interchange-newline" style=3D"-webkit-tap-highligh=
t-color: rgba(26, 26, 26, 0.3); -webkit-text-size-adjust: auto;"></div><div=
 dir=3D"auto"><br></div><div dir=3D"auto">Kind Regards=C2=A0</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">Gyan</div><div dir=3D"auto"><br></div=
><div dir=3D"auto"><br><div class=3D"gmail_quote" dir=3D"auto"><div dir=3D"=
ltr" class=3D"gmail_attr">On Wed, Mar 10, 2021 at 11:04 AM Ketan Talaulikar=
 (ketant) &lt;ketant=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org">40cisc=
o.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-sty=
le:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">





<div lang=3D"EN-IN" link=3D"#0563C1" vlink=3D"purple" style=3D"word-wrap:br=
eak-word">
<div class=3D"m_-8806016055136711812WordSection1">
<p class=3D"MsoNormal"><span>Hi Sasha,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span>Indeed your version is better and we=E2=80=99l=
l put that in on the next draft update.<u></u><u></u></span></p></div></div=
><div lang=3D"EN-IN" link=3D"#0563C1" vlink=3D"purple" style=3D"word-wrap:b=
reak-word"><div class=3D"m_-8806016055136711812WordSection1">
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span>Thanks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Ketan<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@rbbn.com" target=3D"_blank">Alexander.Vainshtein@rbbn.com</a>&gt;
<br>
<b>Sent:</b> 10 March 2021 19:40<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>; <a href=3D"=
mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a href=3D"mailt=
o:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>; Swadesh Agrawal (=
swaagraw) &lt;<a href=3D"mailto:swaagraw@cisco.com" target=3D"_blank">swaag=
raw@cisco.com</a>&gt;; Zafar Ali (zali) &lt;<a href=3D"mailto:zali@cisco.co=
m" target=3D"_blank">zali@cisco.com</a>&gt;; <a href=3D"mailto:rtg-dir@ietf=
.org" target=3D"_blank">rtg-dir@ietf.org</a>; &lt;<a href=3D"mailto:rtg-ads=
@ietf.org" target=3D"_blank">rtg-ads@ietf.org</a>&gt; &lt;<a href=3D"mailto=
:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org</a>&gt;<br>
<b>Subject:</b> RE: RTG-DIR review of draft-ietf-bess-srv6-services-05<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Ketan,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
>From my POV an even better version would be =E2=80=9C</span><b><i><span sty=
le=3D"font-size:10.5pt;font-family:-apple-system;background-color:white;col=
or:black">Usage of multicast trees as P-tunnels is outside the
 scope of this document</span></i></b><span lang=3D"EN-US" style=3D"color:r=
gb(31,73,125)">=E2=80=9D.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
But your proposed text is also OK with me.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Office: +972-39266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Email:=C2=A0=C2=A0 <a href=3D"mailto:Alexander.Vainshtein@rbbn.com" target=
=3D"_blank">
Alexander.Vainshtein@rbbn.com</a><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.co=
m" target=3D"_blank">ketant@cisco.com</a>&gt;
<br>
<b>Sent:</b> Wednesday, March 10, 2021 4:07 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
rbbn.com" target=3D"_blank">Alexander.Vainshtein@rbbn.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a hr=
ef=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaag=
raw@cisco.com" target=3D"_blank">swaagraw@cisco.com</a>&gt;; Zafar Ali (zal=
i) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</=
a>&gt;;
<a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ietf.org</a>;=
 &lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org=
</a>&gt; &lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@=
ietf.org</a>&gt;<br>
<b>Subject:</b> RE: RTG-DIR review of draft-ietf-bess-srv6-services-05<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<table border=3D"1" cellspacing=3D"0" cellpadding=3D"0" style=3D"border:1pt=
 solid black;background-color:yellow">
<tbody>
<tr>
<td style=3D"border:none;padding:0cm">
<p class=3D"MsoNormal"><strong><span style=3D"font-size:12pt;font-family:Ca=
libri,sans-serif">NOTICE:</span></strong><span style=3D"font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif;color:black"> This email was rece=
ived from an
<strong style=3D"font-family:&quot;Times New Roman&quot;,serif"><u style=3D=
"font-family:&quot;Times New Roman&quot;,serif">EXTERNAL</u></strong> sende=
r. </span><span style=3D"font-size:12pt;font-family:&quot;Times New Roman&q=
uot;,serif"><u style=3D"font-family:&quot;Times New Roman&quot;,serif"></u>=
<u style=3D"font-family:&quot;Times New Roman&quot;,serif"></u></span></p>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=3D"font-siz=
e:12pt;font-family:&quot;Times New Roman&quot;,serif"><u style=3D"font-fami=
ly:&quot;Times New Roman&quot;,serif"></u>=C2=A0<u style=3D"font-family:&qu=
ot;Times New Roman&quot;,serif"></u></span></p>
<div>
<p class=3D"MsoNormal">Hi Sasha,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">My apologies and I think I understand your point. Wo=
uld the following text change convey the right meaning?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:-apple-s=
ystem;background-color:white;color:black">s/
<b style=3D"font-family:-apple-system"><i style=3D"font-family:-apple-syste=
m">The setup of multicast trees for use as P-tunnels is outside the scope o=
f this document / The setup and usage of multicast trees as P-tunnels is ou=
tside the scope of this document</i></b></span><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks,<u></u><u></u></p>
<p class=3D"MsoNormal">Ketan<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@rbbn.com" target=3D"_blank">Alexander.Vainshtein@rbbn.com</a>&gt;
<br>
<b>Sent:</b> 10 March 2021 16:15<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a hr=
ef=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaag=
raw@cisco.com" target=3D"_blank">swaagraw@cisco.com</a>&gt;; Zafar Ali (zal=
i) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</=
a>&gt;;
<a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ietf.org</a>;=
 &lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org=
</a>&gt; &lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@=
ietf.org</a>&gt;<br>
<b>Subject:</b> RE: RTG-DIR review of draft-ietf-bess-srv6-services-05<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Ketan,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Lots of thanks for posting an updated version of the draft.<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I have looked it up, and it seems that the majority of my review comments h=
ave been addressed.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I defer to the Routing ADs regarding my metadata comments.<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
One point that, IMHO, requires additional clarification, is restriction of =
EVPN to just ingress replication for delivery of BUM traffic.<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
As I see it, stating that =E2=80=9C</span><b><i><span lang=3D"EN-US">The se=
tup of multicast trees for use as P-tunnels is outside the scope of this do=
cument</span></i></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=E2=80=9D
 =C2=A0=C2=A0does not fully address this issue because, to the best of my u=
nderstanding, RFC 8986 does not define any endpoint behavior that could be =
used for delivery of EVPN BUM traffic via P2MP trees even if such were supp=
orted (seems pretty evident if aggregate multicast
 trees are used, but even non-aggregate multicast trees are not covered IMH=
O).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Please see also more comments to your responses
</span><b><i><span lang=3D"EN-US" style=3D"color:rgb(146,208,80)">inline be=
low</span></i></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">.<u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Office: +972-39266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Email:=C2=A0=C2=A0 <a href=3D"mailto:Alexander.Vainshtein@rbbn.com" target=
=3D"_blank">
Alexander.Vainshtein@rbbn.com</a><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.co=
m" target=3D"_blank">ketant@cisco.com</a>&gt;
<br>
<b>Sent:</b> Wednesday, March 10, 2021 7:55 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
rbbn.com" target=3D"_blank">Alexander.Vainshtein@rbbn.com</a>&gt;; &lt;<a h=
ref=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org</a>&gt; =
&lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org<=
/a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a hr=
ef=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaag=
raw@cisco.com" target=3D"_blank">swaagraw@cisco.com</a>&gt;; Zafar Ali (zal=
i) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</=
a>&gt;;
<a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ietf.org</a><=
br>
<b>Subject:</b> RE: RTG-DIR review of draft-ietf-bess-srv6-services-05<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<table border=3D"1" cellspacing=3D"0" cellpadding=3D"0" style=3D"border:1pt=
 solid black;background-color:yellow">
<tbody>
<tr>
<td style=3D"border:none;padding:0cm">
<p class=3D"MsoNormal"><strong><span style=3D"font-size:12pt;font-family:Ca=
libri,sans-serif">NOTICE:</span></strong><span style=3D"font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif;color:black"> This email was rece=
ived from an
<strong style=3D"font-family:&quot;Times New Roman&quot;,serif"><u style=3D=
"font-family:&quot;Times New Roman&quot;,serif">EXTERNAL</u></strong> sende=
r. </span><span style=3D"font-size:12pt;font-family:&quot;Times New Roman&q=
uot;,serif"><u style=3D"font-family:&quot;Times New Roman&quot;,serif"></u>=
<u style=3D"font-family:&quot;Times New Roman&quot;,serif"></u></span></p>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=3D"font-siz=
e:12pt;font-family:&quot;Times New Roman&quot;,serif"><u style=3D"font-fami=
ly:&quot;Times New Roman&quot;,serif"></u>=C2=A0<u style=3D"font-family:&qu=
ot;Times New Roman&quot;,serif"></u></span></p>
<div>
<p class=3D"MsoNormal">Hi Sasha,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks a lot for your detailed review, your comments=
/feedback and for taking time for discussions with the co-authors for their=
 resolution.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">We=E2=80=99ve just posted an update of the draft to =
address your comments based on our discussions :<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"m_-8806016055136711812MsoPlainText"><a href=3D"https://clicktim=
e.symantec.com/3UsxW3phCpdUtwJLUsoiuXP6H2?u=3Dhttps%3A%2F%2Fdatatracker.iet=
f.org%2Fdoc%2Fhtml%2Fdraft-ietf-bess-srv6-services-06" target=3D"_blank">ht=
tps://datatracker.ietf.org/doc/html/draft-ietf-bess-srv6-services-06</a><u>=
</u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Please see inline below for individual responses.<u>=
</u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@rbbn.com" target=3D"_blank">Alexander.Vainshtein@rbbn.com</a>&gt;
<br>
<b>Sent:</b> 29 January 2021 16:20<br>
<b>To:</b> <a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ie=
tf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a hr=
ef=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaag=
raw@cisco.com" target=3D"_blank">swaagraw@cisco.com</a>&gt;; Zafar Ali (zal=
i) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</=
a>&gt;;
<a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ietf.org</a><=
br>
<b>Subject:</b> RE: RTG-DIR review of draft-ietf-bess-srv6-services-05<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Adding RTG-DIR =E2=80=93 my apologies</span><span lang=3D"EN-US"><u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Regards,</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Sasha</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Office: +972-39266302</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302</span><span lang=3D"EN-U=
S"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Email:=C2=A0=C2=A0 <a href=3D"mailto:Alexander.Vainshtein@rbbn.com" target=
=3D"_blank">
Alexander.Vainshtein@rbbn.com</a></span><span lang=3D"EN-US"><u></u><u></u>=
</span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<div>
<div style=3D"border-style:solid none none;border-top-width:1pt;padding:3pt=
 0cm 0cm;border-top-color:rgb(225,225,225)">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein
<br>
<b>Sent:</b> Friday, January 29, 2021 12:46 PM<br>
<b>To:</b> <a href=3D"mailto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ie=
tf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-bess-srv6-services.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-srv6-services.all@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; <a hr=
ef=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaag=
raw@cisco.com" target=3D"_blank">swaagraw@cisco.com</a>&gt;; Zafar Ali (zal=
i) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</=
a>&gt;<br>
<b>Subject:</b> RTG-DIR review of draft-ietf-bess-srv6-services-05<u></u><u=
></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Hello,</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I have been selected as the Routing Directorate reviewer for this draft. Th=
e Routing Directorate seeks to review all routing or routing-related drafts=
 as they pass through IETF last call and IESG
 review, and sometimes on special request. The purpose of the review is to =
provide assistance to the Routing ADs. For more information about the Routi=
ng Directorate, please see =E2=80=8B<a href=3D"https://clicktime.symantec.c=
om/3DNHqu2P3uB4FTvdUETxnRQ6H2?u=3Dhttp%3A%2F%2Ftrac.tools.ietf.org%2Farea%2=
Frtg%2Ftrac%2Fwiki%2FRtgDir" target=3D"_blank">http://trac.tools.ietf.org/a=
rea/rtg/trac/wiki/RtgDir</a></span><span lang=3D"EN-US"><u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Although these comments are primarily for the use of the Routing ADs, it wo=
uld be helpful if you could consider them along with any other IETF Last Ca=
ll comments that you receive, and strive to resolve
 them through discussion or by updating the draft.</span><span lang=3D"EN-U=
S"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Document: draft-ietf-bess-srv6-services-05</span><span lang=3D"EN-US"><u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Reviewer: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein</span><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Review Date: 29-Jan-21</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
IETF LC End Date: =C2=A0Not known</span><span lang=3D"EN-US"><u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Intended Status: Standards Track</span><span lang=3D"EN-US"><u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">Summary</span></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">:<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I have some minor concerns about this document that I think should be resol=
ved before publication.</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">Comments</span></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">:=
</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
The draft is well written and it was relatively easy to grasp the main idea=
 behind it. However, the draft has to be read in parallel with the
<a href=3D"https://clicktime.symantec.com/3Muuyg43iWUsicfqWidGKhk6H2?u=3Dht=
tps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-srv6-netw=
ork-programming-28" target=3D"_blank">
SRv6 Network Programming draft</a> due to a lot of references to specific S=
Rv6 endpoint behaviors defined in this draft.</span><span lang=3D"EN-US"><u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
>From my POV the draft introduces a new approach to providing BGP-based serv=
ices over an IPv6-capable core that is quite different from the way such se=
rvices have been provided over IP/MPLS cores
 .=C2=A0 It would be nice =C2=A0if the authors could =C2=A0present these di=
fferences in a more explicit way and clarify their impact on such issues as=
 inter-AS/inter-domain services, scalability etc. However this is just a wi=
sh, not a concern.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I have presented my early comments to the authors and contributors to the d=
raft, and we have hold a series of productive =C2=A0discussions that, from =
my POV, resulted in reaching rough consensus regarding
 resolution of all the issues I have raised.</span><span lang=3D"EN-US"><u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I have included my understanding of the authors=E2=80=99 responses in the b=
ody of the review (marked by
<i>italics</i>), and will be waiting for the next revision of the draft for=
 addressing these comments along the agreed upon lines.</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I would like express my gratitude to Gaurav, Swadesh and Zafar =C2=A0for th=
eir responsiveness and cooperation.</span><span lang=3D"EN-US"><u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">Major Issues</span></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">: None found</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">Minor Issues</span></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">:</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>It is quite common to say that the SRv6 dataplane is defined by RFC 8754m =
and this common statement is repeated in the first line of the SRv6 Service=
s draft. However. I am
 not sure whether =C2=A0RFC 8754, by and of itself, =C2=A0is a sufficient r=
eference for the SRv6 dataplane =C2=A0<b>for the purpose of this =C2=A0docu=
ment</b>. My doubts are based on the following:<u></u><u></u></span></li></=
ol>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>RFC 8754 defines the Segment Routing header (SRH) and its handling<u></u><=
u></u></span></li><li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><s=
pan lang=3D"EN-US">The draft explicitly states that best-effort BGP-based s=
ervices over an SRv6 domain can be provided without SRH =E2=80=93 but they =
definitely would use the SRv6 dataplane<u></u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] RFC8754 does indeed =
define the SRH and hence specifies the SRv6 data plane in conjunction with =
RFC8402. Even when SRH is not used (refer RFC 8754 Sec 4.1.1 and RFC 8986 S=
ec 5.1 &amp; 5.2), the processing follows
 RFC 8754 and RFC 8986 since the IPv6 DA in the packet is set to the specif=
ic SRv6 SID. Hence, the references to these two specifications in addition =
to RFC8402.</span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span lang=3D"EN-US" styl=
e=3D"color:rgb(31,73,125)">My guess is that the=C2=A0 primary reference for=
 the SRv6 dataplane for this draft is provided by the SRv6 Network Programm=
ing draft and augmented by RFC 8754. This guess is
 aligned with the frequent references to the SRv6 Network Programming draft=
 in the SRv6 Services draft.</span><span lang=3D"EN-US"><u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] Your understanding i=
s correct here as clarified in the previous response and we have updated th=
e text to better reflect the use of SRv6 Service SID alone for best effort =
and then the use of SRH as well.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:rgb(146,20=
8,80)">[[Sasha]] The new version refers to RFC 8402 for the definition of S=
Rv6, which is OK with me.</span></i></b><span lang=3D"EN-US" style=3D"color=
:rgb(146,208,80)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">=C2=A0</span></i></b><spa=
n lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span lang=3D"EN-US" styl=
e=3D"color:rgb(31,73,125)">I defer to the ADs and the leaders of the SPRING=
 WG to decide how this issue should be resolved</span><span lang=3D"EN-US">=
<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>The draft explicitly states in Section 2 that it =E2=80=9C</span><span lan=
g=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;">extends the BGP P=
refix-SID attribute [RFC8669] to carry =C2=A0SRv6
 SIDs and associated information</span><span lang=3D"EN-US">=E2=80=9D. Howe=
ver, the draft:<u></u><u></u></span></li></ol>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>Does not explicitly states that that =C2=A0it also extends RFC 8669 by all=
owing BGP Prefix SID to be used with new AFI/SAFI (VPN-v4, VPN-v6 and EVPN)=
 anywhere in the text (RFC
 8669 is explicitly limited to IPv4/IPv6 Labeled Unicast leaving usage of t=
he BGP Prefix SID attribute with other AFI/SAFI out of scope)<u></u><u></u>=
</span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] Agree =E2=80=93 we h=
ave clarified this in the text<span style=3D"color:rgb(146,208,80)">.[[Sash=
a]] Yes, lots of thanks.
</span></span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>Is not marked as updating RFC 8669 in the metadata<u></u><u></u></span></l=
i></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] I am not sure this i=
s necessary since it does not really =E2=80=9Cupdate=E2=80=9D the processin=
g or handling of the feature specified in RFC8669 =E2=80=93 this draft just=
 re-uses the attribute introduced there<span style=3D"color:rgb(146,208,80)=
">.[[Sasha]]
 I defer to the ADs to decide whether such marking is or is not required.</=
span><u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US"><u></u>=C2=A0<u></u></spa=
n></i></b></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>To the. best of my understanding
<i>the authors do not object to=C2=A0 explicitly clarifying that this draft=
 extends RFC 8669 also by applying it to new AFI/SAFI</i>. I believe that i=
t would be up to the Routing ADs to decide whether draft should be marked a=
s updating RFC 8669 in the metadata<u></u><u></u></span></li><li class=3D"M=
soNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US">I also wonder=
 whether this draft should not be considered as updating RFC 4364 and RFC 4=
659 because it suggests carrying, in the Label field of the NLRI of the rou=
tes defined
 in these documents, values that do not represent MPLS labels (or represent=
 special purpose values that are used in these fields). The same applies to=
 RFC 7432=C2=A0 - but to a lesser extent since this document allows carryin=
g VNI values as well as MPLS labels.
 I defer to the Routing ADs to decide how this should be handled<u></u><u><=
/u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] Let us take an examp=
le, RFC8365 introduced new dataplane support for EVPN (RFC7432) using VXLAN=
 (and others) but allowing VNI to be carried in the MPLS label fields of RF=
C7432. However, RFC8365 does not update
 RFC7432. We have a similar case, where a new dataplane (feature) is being =
specified for use with existing BGP services<span style=3D"color:rgb(146,20=
8,80)">.[[Sasha]] Same as above.
</span></span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>Section 3 states: =E2=80=9CImplementations supporting this specification S=
HOULD provide a mechanism to control advertisement of SRv6-based BGP servic=
e routes on a per neighbor and
 per service basis=E2=80=9D. <u></u><u></u></span></li></ol>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>The purpose of this recommendation is prevention of misinterpretation by t=
he BGP speakers that do not support the draft, of the label fields of the s=
ervice routes as referring
 to MPLS labels while in fact these fields carry transposed parts of the SR=
v6 Service SIDs
<u></u><u></u></span></li><li class=3D"MsoNormal" style=3D"color:rgb(31,73,=
125)"><span lang=3D"EN-US">I would like to understand how advertisement of =
SRv6 Service routes to non-compliant PEs by BGP Route Reflectors can be pre=
vented if
<u></u><u></u></span></li></ol>
</ol>
<p class=3D"m_-8806016055136711812MsoListParagraph" style=3D"margin-left:10=
8pt">
<u></u><span lang=3D"EN-US"><span><span style=3D"font-style:normal;font-var=
iant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-=
height:normal;font-family:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>i.<span style=3D"font-style:normal;font-variant-caps:normal;font-wei=
ght:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family=
:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></span=
><u></u><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">The=C2=A0 clien=
ts of these Route Reflectors include both compliant and non-compliant PEs
</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"m_-8806016055136711812MsoListParagraph" style=3D"margin-left:10=
8pt">
<u></u><span lang=3D"EN-US"><span><span style=3D"font-style:normal;font-var=
iant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-=
height:normal;font-family:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>ii.<span style=3D"font-style:normal;font-variant-caps:normal;font-we=
ight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-famil=
y:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></spa=
n><u></u><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">The Route Refl=
ectors also do not recognize BGP Prefix SID</span><span lang=3D"EN-US"><u><=
/u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><i><span lang=3D"EN-=
US">The authors have agreed to clarify that the mechanisms for prevention a=
re implementation- and/or deployment-specific and=C2=A0 will provide an exa=
mple of a suitable BGP policy</span></i><span lang=3D"EN-US">.
 From my POV this would be most useful<u></u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] As discussed, there =
are different approaches and mechanisms possible for BGP policy that are de=
ployment design specific and better covered in a separate document. We have=
 clarified this in the text.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:rgb(146,20=
8,80)">[[Sasha]] The new text simply leaves the solution out of scope. If a=
 non-normative example could be added, it would be nice IMHO.</span></i></b=
><span lang=3D"EN-US" style=3D"color:rgb(146,208,80)"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">=C2=A0</span></i></b><spa=
n lang=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>I have not found any references to multicast in MPLS/BGP IP VPNs (RFC 6513=
) in the draft.
<a href=3D"https://clicktime.symantec.com/32TG19gUV4Lj31a5gjgAQYu6H2?u=3Dht=
tps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-sr-replic=
ation-segment-03" target=3D"_blank">
Neither is the SR Replication Segment for Multi-point Service Delivery draf=
t</a> mentioned anywhere. It is not clear to me whether such services canno=
t be supported over SRv6, or are left for future study. Clarifying this poi=
nt would be quite helpful IMHO<i>.
 In our discussion the authors have stated that MVPN is out of scope of the=
 draft and would be covered by a different document</i><u></u><u></u></span=
></li></ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] You are correct; MVP=
N and P2MP SRv6 are going to be covered in separate documents. We have clar=
ified this in the text<span style=3D"color:rgb(146,208,80)">.[[Sasha]] The =
new text is OK.
</span></span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>It is my impression that delivery of BUM traffic over EVPN services as def=
ined in the draft is limited to ingress replication as the provider tunneli=
ng technology:<u></u><u></u></span></li></ol>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>This impression is based on the following observations:<u></u><u></u></spa=
n></li></ol>
</ol>
<p class=3D"m_-8806016055136711812MsoListParagraph" style=3D"margin-left:10=
8pt">
<u></u><span lang=3D"EN-US"><span><span style=3D"font-style:normal;font-var=
iant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-=
height:normal;font-family:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>i.<span style=3D"font-style:normal;font-variant-caps:normal;font-wei=
ght:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family=
:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></span=
><u></u><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">According to Se=
ction 8.3.1.2 =C2=A0of RFC 7432, in the case of provider tunneling technolo=
gies that are different from ingress replication,
 =C2=A0the ESI label is upstream-assigned by the advertising PE and has to =
be interpreted by the egress PEs in the context of the ingress PE that, in =
its turn, has to be inferred from the identification of the P2MP tunnel ove=
r which the packet containing the EVPN-encapsulated
 BUM frame has been received by the egress PE</span><span lang=3D"EN-US"><u=
></u><u></u></span></p>
<p class=3D"m_-8806016055136711812MsoListParagraph" style=3D"margin-left:10=
8pt">
<u></u><span lang=3D"EN-US"><span><span style=3D"font-style:normal;font-var=
iant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-=
height:normal;font-family:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>ii.<span style=3D"font-style:normal;font-variant-caps:normal;font-we=
ight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-famil=
y:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></spa=
n><u></u><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">The definition=
 of the End.DT2M behavior in the SRv6 Network Programming draft requires as=
sociation of specific outgoing interfaces
 in the L2 outgoing interfaces of the corresponding table in the egress PE =
with specific Arg.FE2 values and encoding these values in the SRv6 SIDs ass=
ociated with this behavior. Such association presumably does not depend on =
specific ingress PEs</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"m_-8806016055136711812MsoListParagraph" style=3D"margin-left:10=
8pt">
<u></u><span lang=3D"EN-US"><span><span style=3D"font-style:normal;font-var=
iant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-=
height:normal;font-family:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>iii.<span style=3D"font-style:normal;font-variant-caps:normal;font-w=
eight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-fami=
ly:&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></sp=
an><u></u><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">Neither the S=
Rv6 Network Programming draft for the SRv6 Services one provide any details=
 about inferring the context for the upstream-assigned
 ESI labels from the received SRv6 SIDs.</span><span lang=3D"EN-US"><u></u>=
<u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>If my understanding is correct, such a limitation should be explicitly sta=
ted in the draft. In our discussion the authors have stated that P2MP SRv6 =
trees is out of scope
 of the draft and would be covered by a different document. <i>It is my und=
erstanding that the authors would not object to such a clarification</i><u>=
</u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] The draft does have =
the following text at the end of Sec 6.3 =E2=80=93 =E2=80=9CThe setup of mu=
lticast trees for use as P-tunnels is outside the scope of this document.=
=E2=80=9D<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:rgb(146,20=
8,80)">[[Sasha]] I still think that an explicit statement that the draft is=
 limited to ingress replication for EVPN is required because, to the best o=
f my understanding,
<a href=3D"https://clicktime.symantec.com/a/1/biKp1AfoqwCVjtqxg5_vLdEMaWnvI=
4M-LJJtOF_BtLA=3D?d=3DGveeddDdNDsKHR-czb3Wltcci3Ee7a8MY3Vhln8iQrgFexk1L1aug=
TK1ls8B3BDL5bP_EzXeteWybZLr99fehzgcX5ynSev6sool_xo1KVsd4RYsdlyoqeQ7bDwRziDk=
G3Ed4HWP-il5lzxmQqZK46RIp-Fw1tghrJcrgvGpRNsYvrSJB7JNnnuS3-oVARnTg-JeBNgiukr=
dul4BQO0hBszmhO1SCm9TJcgl34O-2OWt5jD6v4kyOnBKF2R35Q25T21RcJp28zIJPGY5M9cJde=
ahRwe5it29BQ_ipGOVfT9prRfz67VJ2D8471XyHhA3cZ9A2PFf9AqwEolwHDhY01XHc4IOUbc8a=
_9Dd7fCWG4Ygt2r8uME-Pv9kO3IxbhlcYNHHIlLL96J1at9Md_83GYTAJ28a5D7ze64nO23oPzG=
M8sMlN16KRoKz8i5CybmlVmZNYTwt6MoW0xPjAs4QE2Wpui3QvNtnIoBMOGe&amp;u=3Dhttps%=
3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8986" target=3D"_blank">
<span style=3D"color:rgb(146,208,80)">RFC 8986</span></a> does not define a=
 suitable endpoint behavior. Did I miss something here?</span></i></b><span=
 lang=3D"EN-US" style=3D"color:rgb(146,208,80)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><i><span lang=3D"EN-US">=C2=A0</span></i><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>When it comes to usage of ingress replication in EVPN, my guess (FIIW) is =
that EVPN over SRv6 that uses ingress replication would be fully compatible=
 with the Assisted Ingress
 Replication scheme as described in the <a href=3D"https://clicktime.symant=
ec.com/3SvJDuvNrUXrGUuf6hsEZn16H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2F=
doc%2Fhtml%2Fdraft-ietf-bess-evpn-optimized-ir-07" target=3D"_blank">
Optimized Ingress Replication for EVPN</a> draft. If this is indeed so, it =
would be useful if this fact were explicitly mentioned in the draft (with a=
n Informative reference to the Optimized Ingress Replication draft).
<i>In our discussion the authors stated that the draft is fully compatible =
with the Assisted replication scheme=C2=A0 just as any other IP-based encap=
sulation</i><u></u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] You are correct abou=
t the applicability of that draft to SRv6 based BGP services.</span></i></b=
><span lang=3D"EN-US">
<b><i>There are other EVPN extensions/procedures which also apply and it ma=
y be misleading to include and discuss one of them and not cover the others=
<span style=3D"color:rgb(146,208,80)">.[[Sasha]] Well, I can live with that=
.
</span></i></b><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">=C2=A0</span></i></b><spa=
n lang=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"6" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>The draft defines two schemes for encoding the actual service SID in the l=
abeled service routes:<u></u><u></u></span></li></ol>
<ol style=3D"margin-top:0cm" start=3D"6" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>The entire SRv6 SID encoded in the BGP Prefix SID attribute combined with =
Implicit NULL as the label in the NLRI of the route<u></u><u></u></span></l=
i><li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-U=
S">The Transposition Scheme: Only the locator part of the SRv6 SID encoded =
in the BGP Prefix SID attribute while the function and arguments (if any) a=
re encoded as the label
 field of the NLRI. <u></u><u></u></span></li><li class=3D"MsoNormal" style=
=3D"color:rgb(31,73,125)"><span lang=3D"EN-US">Neither of these schemes is =
defined as MANDATORY, but the Transposition Scheme is RECOMMENDED as provid=
ing more efficient packing<u></u><u></u></span></li><li class=3D"MsoNormal"=
 style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US">To the best of my unde=
rstanding, the egress PE can use any of these schemes at its discretion whe=
n it advertises the service routes. Is this correct? If yes, does this mean
 that the ingress PE MUST support both schemes? <i>In our discussion the au=
thors have confirmed that</i><u></u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] This is correct.</sp=
an></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"6" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>I have to admit that I do not fully understand why the Transposition Schem=
e is more effective since eventually the same set of Service SIDs has to be=
 allocated and advertised
 by the egress PEs; but this is probably my personal problem. <u></u><u></u=
></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] The efficiency is no=
t in the context of Service SID allocation, but in the packing efficiency o=
f the BGP updates<span style=3D"color:rgb(146,208,80)">.[[Sasha]] Got it no=
w, thanks a lot!
</span></span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"7" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>The last para of Section 4 the draft (that discusses per Ethernet Segment =
EVPN Auto-Discovery route), says that the =E2=80=9C</span><span lang=3D"EN-=
US" style=3D"font-family:&quot;Courier New&quot;">argument
 part of the SRv6 SID MAY be transposed in the ESI Label field of the ESI L=
abel Extended Community and the SID value in the SRv6 Services TLV is set t=
o 0 with the SRv6 SID Structure Sub-Sub-TLV</span><span lang=3D"EN-US">=E2=
=80=9D. From my POV:<u></u><u></u></span></li></ol>
<ol style=3D"margin-top:0cm" start=3D"7" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>There is no other place where this argument can be transposed =E2=80=93 be=
cause, as per RFC 7432, the Label filed of this route MUST be set to 0<u></=
u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] Correct.</span></i><=
/b><span lang=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"7" type=3D"1">
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"a">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>In the general situation (when the Egress PE is attached to multiple multi=
-homed Ethernet Segments and contains multiple MAC-VRFs attached to these s=
egments) the Arg.FE2
 value (that is assigned per ES and carried with the per-ES Ethernet A-D ro=
ute) MUST be combined with the Function part of the SRv6 Service SID (that =
is allocated per Bridge Table and advertised in the Inclusive Multicast Eth=
ernet Tag EVPN route) using the
 Transposition scheme. <u></u><u></u></span></li><li class=3D"MsoNormal" st=
yle=3D"color:rgb(31,73,125)"><span lang=3D"EN-US">I also think that consist=
ent usage of the Transposition Scheme (i.e., same offset and length) across=
 multiple EVPN routes is required.
<i>It is my understanding that the authors agree that consistent usage of t=
he Transposition Scheme across multiple ES and multiple EVI is expected</i>=
<u></u><u></u></span></li></ol>
</ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] This is also correct=
.</span></i></b><span lang=3D"EN-US">
<b><i>The procedure is explained in Sec 6.3.</i></b><u></u><u></u></span></=
p>
<ol style=3D"margin-top:0cm" start=3D"8" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>Both the SRv6 Network Programming draft and the SRv6 Services draft use no=
tation Arg.FE2, but I have not found any definition of this notation.
<i>According to the authors, these two drafts define this notation and no a=
dditional definition is required, and agreed to state that explicitly in th=
e draft</i>.
<u></u><u></u></span></li></ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] The definition of th=
is notation is indeed in RFC8986 Sec 4.12 and this draft specifies how it i=
s advertised via BGP. We have clarified this in the text<span style=3D"colo=
r:rgb(146,208,80)">.[[Sasha]] =C2=A0Yes, OK with me.</span></span></i></b><=
span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18pt"><span lang=3D"EN-US" styl=
e=3D"color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125=
)">Nits</span></b><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">:</sp=
an><span lang=3D"EN-US"><u></u><u></u></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US"=
>I did not run the nits check on the draft<u></u><u></u></span></li><li cla=
ss=3D"MsoNormal" style=3D"color:rgb(31,73,125)"><span lang=3D"EN-US">In the=
 3<sup>rd</sup> para of Section 1: s/one of the service specific
<span style=3D"background-color:yellow">behavior</span>/ one of the service=
 specific
<span style=3D"background-color:yellow">behaviors</span>/<u></u><u></u></sp=
an></li></ol>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">[KT] Ack for both.</span>=
</i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US"><u></u>=C2=A0<u></u></spa=
n></i></b></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">Thanks,</span></i></b><sp=
an lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">Ketan (on behalf of co-au=
thors)</span></i></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Hopefully these notes will be useful.</span><span lang=3D"EN-US"><u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US">=C2=A0</span></i></b><spa=
n lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: +972-39266302<u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 +972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:=C2=A0=C2=A0 <a href=3D"m=
ailto:Alexander.Vainshtein@rbbn.com" target=3D"_blank">
Alexander.Vainshtein@rbbn.com</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br>
Notice: This e-mail together with any attachments may contain information o=
f Ribbon Communications Inc. and its Affiliates that is confidential and/or=
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sure, reliance or distribution by
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 you are not the intended recipient, please notify the sender immediately a=
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Notice: This e-mail together with any attachments may contain information o=
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Notice: This e-mail together with any attachments may contain information o=
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
CC: "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
Thread-Topic: WG Last Call draft-ietf-spring-nsh-sr
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Date: Mon, 15 Mar 2021 09:45:04 +0000
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Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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Hi Bruno,

I've read this document and support its publication.

Best regards,
Jie

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Friday, March 5, 2021 1:45 AM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

We received very few support and review so far: two reviews excluding the a=
uthors and including the shepherd.
Thanks Greg for the review.

To allow for more feedback, the WG last call is extended for two weeks unti=
l March 18.

In the meantime, authors are invited to reply to the comments sent on the l=
ist.

Thanks,
--Bruno

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com<mailto:bruno.decraene@orange.com>
Sent: Tuesday, February 9, 2021 7:31 PM
To: spring@ietf.org<mailto:spring@ietf.org>
Cc: draft-ietf-spring-nsh-sr@ietf.org<mailto:draft-ietf-spring-nsh-sr@ietf.=
org>
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]=
.

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr

--Bruno


___________________________________________________________________________=
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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Hi Bruno,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">I&#8217;ve read this document and supp=
ort its publication.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Jie<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:ZH-CN">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:ZH-CN"> spring [mailto:spring-bounces@ietf.org]
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Friday, March 5, 2021 1:45 AM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> Re: [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:=
p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Dear WG,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">We rece=
ived very few support and review so far: two reviews excluding the authors =
and including the shepherd.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
Greg for the review.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">To allo=
w for more feedback, the WG last call is extended for two weeks until March=
 18.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">In the =
meantime, authors are invited to reply to the comments sent on the list.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">--Bruno=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"mso-fareast-language:F=
R">From:</span></b><span lang=3D"FR" style=3D"mso-fareast-language:FR"> spr=
ing [<a href=3D"mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.=
org</a>]
<b>On Behalf Of </b><a href=3D"mailto:bruno.decraene@orange.com">bruno.decr=
aene@orange.com</a><br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-spring-nsh-sr@ietf.org">draft-ietf-=
spring-nsh-sr@ietf.org</a><br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I&#8217;ll forward th=
at call to the SFC WG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">Thanks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">[1] <a href=3D"https://tools.ietf.=
org/html/draft-ietf-spring-nsh-sr">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
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From: <bruno.decraene@orange.com>
To: "spring@ietf.org" <spring@ietf.org>, "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
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Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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Hi authors, SPRING,

Speaking as shepherd.

Encapsulation of NSH following SRv6 may be indicated either by
   encapsulating NSH in UDP (UDP port TBA1) and indicating UDP in the
   Next Header field of the SRH, or by indicating an IP protocol number
   for NSH in the Next Header of the SRH."


Yes, NSH may be encapsulated using a variety of ways. But did we had a disc=
ussion about why we need to specify both?
A priori, having N ways increase the cost and decrease the interoperability.

More specifically, why do we need to add the UDP layer?
- This increases the packet overhead
- In IPv4, UDP may be a solution to cross NAT-PT, but for IPv6 this looks l=
ess likely. Plus the use case would likely have NAT as a Service Function, =
not between Service Functions
- In IPv4, UDP may be a solution to provide entropy for ECMP. But in IPv6 &=
 SRv6, we already have the flow label.
- The use of UDP is likely to require an additional section and discussion =
(from Transport Area) regarding congestion.

Thanks,
Regards,
--Bruno


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Tuesday, February 9, 2021 7:31 PM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr

Dear WG,

This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1].

After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.

In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.
Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.

If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.

Note that I'll forward that call to the SFC WG.

Thanks!

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr

--Bruno


___________________________________________________________________________=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" Priority=3D"22" QFormat=3D"true" Name=3D"S=
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<w:LsdException Locked=3D"false" Priority=3D"20" QFormat=3D"true" Name=3D"E=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"E-mail Signature"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder Te=
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<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" Name=3D"No=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
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<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" Name=3D"L=
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<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" Name=3D"Q=
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<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" Name=3D"I=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 1=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
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<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 2=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
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<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 3=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 4=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
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<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 5=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 6=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true" Name=3D"S=
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<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true" Name=3D"I=
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<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true" Name=3D"S=
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<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true" Name=3D"I=
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<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" Name=3D"B=
ook Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
WhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table 1"/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table 2"/>
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<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-far=
east-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family=
:&quot;Times New Roman&quot;;color:#1F497D">Hi
<span class=3D"SpellE">authors</span>, SPRING,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-far=
east-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family=
:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
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idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">Speaking as shepherd.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
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idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
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t 687.0pt 732.8pt">
<span lang=3D"EN-GB" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-GB;mso-fareast-language:FR">Encapsulation of NSH following SRv6 may b=
e indicated either by<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-GB" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-GB;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>encapsulating NSH in UDP (UDP port TBA1) and indicating UDP in the<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-GB" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-GB;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>Next Header field of the SRH, or by indicating an IP protocol number=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
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t 687.0pt 732.8pt">
<span lang=3D"EN-GB" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-GB;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>for NSH in the Next Header of the SRH.&#8221;<o:p></o:p></span></p>
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idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
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idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">Yes, NSH may be encapsulated using a variety
 of ways. But did we had a discussion about why we need to specify both?<o:=
p></o:p></span></p>
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idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">A priori, having N ways increase the cost
 and decrease the interoperability.<o:p></o:p></span></p>
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<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">More specifically, why do we need to add
 the UDP layer?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">- This increases the packet overhead<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">- In IPv4, UDP may be a solution to cross
 NAT-PT, but for IPv6 this looks less likely. Plus the use case would likel=
y have NAT as a Service Function, not between Service Functions<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">- In IPv4, UDP may be a solution to provide
 entropy for ECMP. But in IPv6 &amp; SRv6, we already have the flow label.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">- The use of UDP is likely to require an
 additional section and discussion (from Transport Area) regarding congesti=
on.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><span class=3D"SpellE"><b><span style=3D"mso-fareast=
-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;mso-f=
areast-language:FR">From</span></b></span><b><span style=3D"mso-fareast-fon=
t-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;mso-farea=
st-language:FR">:</span></b><span style=3D"mso-fareast-font-family:&quot;Ti=
mes New Roman&quot;;mso-bidi-font-family:Calibri;mso-fareast-language:FR">
<span class=3D"SpellE">spring</span> [mailto:spring-bounces@ietf.org] <b>On=
 Behalf Of
</b>bruno.decraene@orange.com<br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Dear WG, <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr =
[1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">After review of the document please indicate whether you believe this do=
cument should be progressed to the IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">In addition to yes/no, please consider providing a technical review of t=
his document; in particular if you care for this document.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Indeed, since WG adoption, this document had benefited from little revie=
ws from the WG, so we need more review from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">If you are aware of an implementation of this document, please report th=
e implementation either on the list or to the chairs so that the shepherd c=
an report implementations in the writeup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">Note that I&#8217;ll forward that call to the SFC WG.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Thanks!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">[1] <a href=3D"https://tools.ietf.org/html/draft-iet=
f-spring-nsh-sr">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">--Bruno<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>______________________________________________________________________=
___________________________________________________<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<o:p></o:p></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<o:p></o:p></pre>
<pre>a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>
<pre>they should not be distributed, used or copied without authorisation.<=
o:p></o:p></pre>
<pre>If you have received this email in error, please notify the sender and=
 delete this message and its attachments.<o:p></o:p></pre>
<pre>As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.<o:p></o:p></pre>
<pre>Thank you.<o:p></o:p></pre>
</div>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</PRE></body>
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false" Priority=3D"49" Name=3D"List Table 4 Accent 6"></w:LsdException>=0A=
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 Dark=
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Exception Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 Colorful A=
ccent 6"></w:LsdException>=0A</w:LatentStyles>=0A</xml><![endif]--><!--[if=
 gte mso 10]><style>/* Style Definitions */=0Atable.MsoNormalTable=0A	{mso=
-style-name:"Tableau Normal";=0A	mso-tstyle-rowband-size:0;=0A	mso-tstyle-=
colband-size:0;=0A	mso-style-noshow:yes;=0A	mso-style-priority:99;=0A	mso-=
style-parent:"";=0A	mso-padding-alt:0cm 5.4pt 0cm 5.4pt;=0A	mso-para-margi=
n:0cm;=0A	mso-para-margin-bottom:.0001pt;=0A	mso-pagination:widow-orphan;=
=0A	font-size:10.0pt;=0A	font-family:"Calibri",sans-serif;=0A	mso-bidi-fon=
t-family:"Times New Roman";=0A	mso-fareast-language:EN-US;}=0A</style><![e=
ndif]--><!--[if gte mso 9]><xml>=0A<o:shapedefaults v:ext=3D"edit" spidmax=
=3D"1026" ></o:shapedefaults>=0A</xml><![endif]--><!--[if gte mso 9]><xml>=
=0A<o:shapelayout v:ext=3D"edit">=0A<o:idmap v:ext=3D"edit" data=3D"1" ></=
o:idmap>=0A</o:shapelayout></xml><![endif]-->=0A<div><span></span>Hi=EF=BC=
=8C</div><div>I support the publication. It describes the solution to supp=
ort SFC by the<span style=3D"orphans: 2; widows: 2; line-height: 1.5; back=
ground-color: transparent;">&nbsp;integration of NSH and SR. It is useful.=
&nbsp;</span></div><div><span style=3D"orphans: 2; widows: 2; line-height:=
 1.5; background-color: transparent;"><br></span></div><div><span style=3D=
"orphans: 2; widows: 2; line-height: 1.5; background-color: transparent;">=
Best regards,</span></div><div style=3D"orphans: 2; widows: 2;">Cong</div>=
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5=
em; margin-Right: inherit"><div style=3D"border:none;border-top:solid #B5C=
4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PAD=
DING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROU=
ND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp=
;<a href=3D"mailto:bruno.decraene@orange.com" style=3D"color: rgb(5, 99, 1=
93); text-decoration: underline;">bruno.decraene@orange.com</a></div><div>=
<b>Date:</b>&nbsp;2021-03-05&nbsp;01:45</div><div><b>To:</b>&nbsp;<a href=
=3D"mailto:spring@ietf.org" style=3D"color: rgb(5, 99, 193); text-decorati=
on: underline;">spring@ietf.org</a></div><div><b>CC:</b>&nbsp;<a href=3D"m=
ailto:draft-ietf-spring-nsh-sr@ietf.org" style=3D"color: rgb(5, 99, 193); =
text-decoration: underline;">draft-ietf-spring-nsh-sr@ietf.org</a></div><d=
iv><b>Subject:</b>&nbsp;Re: [spring] WG Last Call draft-ietf-spring-nsh-sr=
</div></div></div><div><div class=3D"FoxDiv20210315233621301642">=0A<!--[i=
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tentStyles>=0A</xml><![endif]--><!--[if gte mso 10]><style>/* Style Defini=
tions */=0Atable.MsoNormalTable=0A	{mso-style-name:"Tableau Normal";=0A	ms=
o-tstyle-rowband-size:0;=0A	mso-tstyle-colband-size:0;=0A	mso-style-noshow=
:yes;=0A	mso-style-priority:99;=0A	mso-style-parent:"";=0A	mso-padding-alt=
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001pt;=0A	mso-pagination:widow-orphan;=0A	font-size:10.0pt;=0A	font-family=
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areast-language:EN-US;}=0A</style><![endif]--><!--[if gte mso 9]><xml>=0A<=
o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A</xm=
l><![endif]--><!--[if gte mso 9]><xml>=0A<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A</o:shapelayout></xml><![=
endif]-->=0A<div class=3D"WordSection1" style=3D"page: WordSection1;">=0A<=
p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span class=3D"SpellE"><span style=3D"m=
so-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-fon=
t-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1=
F497D">Dear</span></span><span style=3D"mso-ascii-font-family:Calibri;mso-=
fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-fa=
mily:&quot;Times New Roman&quot;;color:#1F497D">=0A WG,<o:p></o:p></span><=
/p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size:=
 11pt; font-family: Calibri, sans-serif;"><span style=3D"mso-ascii-font-fa=
mily:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri=
;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbs=
p;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.00=
01pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN=
-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibr=
i;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman=
&quot;;color:#1F497D;mso-ansi-language:EN-US">We received very few support=
 and review=0A so far: two reviews excluding the authors and including the=
 shepherd.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><sp=
an lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-=
family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Thanks Greg for=
 the review.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margi=
n: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><=
span lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-fon=
t-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;=
Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</=
o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt=
; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-US"=
 style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quo=
t;;color:#1F497D;mso-ansi-language:EN-US">To allow for more feedback, the =
WG last=0A call is extended for two weeks until March 18.<o:p></o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-siz=
e: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"=
mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-fo=
nt-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#=
1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D=
"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-famil=
y: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-ascii-font-fami=
ly:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;m=
so-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-lan=
guage:EN-US">In the meantime, authors are invited to=0A reply to the comme=
nts sent on the list.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-=
serif;"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fa=
reast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-fami=
ly:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p=
>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm=
 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=
=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New=
 Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Thanks,<o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-s=
ize: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-US" style=
=3D"mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hans=
i-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>=0A<p cla=
ss=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-=
family: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-ascii-font=
-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Cali=
bri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ans=
i-language:EN-US"><o:p>&nbsp;</o:p></span></p>=0A<div style=3D"border:none=
;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div s=
tyle=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0=
cm">=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size=
: 11pt; font-family: Calibri, sans-serif;"><span class=3D"SpellE"><b><span=
 style=3D"mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-fon=
t-family:Calibri;mso-fareast-language:FR">From</span></b></span><b><span s=
tyle=3D"mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-=
family:Calibri;mso-fareast-language:FR">:</span></b><span style=3D"mso-far=
east-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;=
mso-fareast-language:FR">=0A<span class=3D"SpellE">spring</span> [mailto:s=
pring-bounces@ietf.org] <b>On Behalf Of=0A</b>bruno.decraene@orange.com<br=
>=0A<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>=0A<b>To:</b> spring=
@ietf.org<br>=0A<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>=0A<b>Subj=
ect:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></span><=
/p>=0A</div>=0A</div>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.=
0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;</o=
:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-s=
ize: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=
=3D"mso-ansi-language:EN-GB">Dear WG, <o:p>=0A</o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-fa=
mily: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-languag=
e:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;=
"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">This message star=
ts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></sp=
an></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-s=
ize: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=
=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"Ms=
oNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">After review of the document please indicate whether you believe this d=
ocument should be progressed to the IESG.<o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-fa=
mily: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-languag=
e:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;=
"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">In addition to ye=
s/no, please consider providing a technical review of this document; in pa=
rticular if you care for this document.<o:p></o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-fa=
mily: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-languag=
e:EN-GB">Indeed, since WG adoption, this document had benefited from littl=
e reviews from the WG, so we need more review from the SPRING WG.=0A<o:p><=
/o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001p=
t; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB=
" style=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p clas=
s=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-f=
amily: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-langua=
ge:EN-GB">If you are aware of an implementation of this document, please r=
eport the implementation either on the list or to the chairs so that the s=
hepherd can report implementations in the writeup.<o:p></o:p></span></p>=
=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11=
pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-a=
nsi-language:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">Note t=
hat I=E2=80=99ll forward that call to the SFC WG.<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;=
 font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi=
-language:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" sty=
le=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, san=
s-serif;">Thanks!<o:p></o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:=
p>&nbsp;</o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.000=
1pt; font-size: 11pt; font-family: Calibri, sans-serif;">[1] <a href=3D"ht=
tps://tools.ietf.org/html/draft-ietf-spring-nsh-sr" style=3D"color: rgb(5,=
 99, 193); text-decoration: underline;">=0Ahttps://tools.ietf.org/html/dra=
ft-ietf-spring-nsh-sr</a><o:p></o:p></p>=0A<p class=3D"MsoNormal" style=3D=
"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-ser=
if;"><o:p>&nbsp;</o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0=
cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">--Bruno<o=
:p></o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=
=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: '=
Courier New';">___________________________________________________________=
______________________________________________________________<o:p></o:p><=
/pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-fami=
ly: 'Courier New';"><o:p>&nbsp;</o:p></pre>=0A<pre style=3D"margin: 0cm 0c=
m 0.0001pt; font-size: 10pt; font-family: 'Courier New';">Ce message et se=
s pieces jointes peuvent contenir des informations confidentielles ou priv=
ilegiees et ne doivent donc<o:p></o:p></pre>=0A<pre style=3D"margin: 0cm 0=
cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';">pas etre diffus=
es, exploites ou copies sans autorisation. Si vous avez recu ce message pa=
r erreur, veuillez le signaler<o:p></o:p></pre>=0A<pre style=3D"margin: 0c=
m 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';">a l'expedite=
ur et le detruire ainsi que les pieces jointes. Les messages electroniques=
 etant susceptibles d'alteration,<o:p></o:p></pre>=0A<pre style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';">Orange de=
cline toute responsabilite si ce message a ete altere, deforme ou falsifie=
. Merci.<o:p></o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-s=
ize: 10pt; font-family: 'Courier New';"><o:p>&nbsp;</o:p></pre>=0A<pre sty=
le=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New=
';">This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>=0A<pre style=
=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';=
">they should not be distributed, used or copied without authorisation.<o:=
p></o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; =
font-family: 'Courier New';">If you have received this email in error, ple=
ase notify the sender and delete this message and its attachments.<o:p></o=
:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-=
family: 'Courier New';">As emails may be altered, Orange is not liable for=
 messages that have been modified, changed or falsified.<o:p></o:p></pre>=
=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: '=
Courier New';">Thank you.<o:p></o:p></pre>=0A</div>=0A</div>=0A<pre style=
=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';=
">________________________________________________________________________=
_________________________________________________=0ACe message et ses piec=
es jointes peuvent contenir des informations confidentielles ou privilegie=
es et ne doivent donc=0Apas etre diffuses, exploites ou copies sans autori=
sation. Si vous avez recu ce message par erreur, veuillez le signaler=0Aa =
l'expediteur et le detruire ainsi que les pieces jointes. Les messages ele=
ctroniques etant susceptibles d'alteration,=0AOrange decline toute respons=
abilite si ce message a ete altere, deforme ou falsifie. Merci.=0AThis mes=
sage and its attachments may contain confidential or privileged informatio=
n that may be protected by law;=0Athey should not be distributed, used or =
copied without authorisation.=0AIf you have received this email in error, =
please notify the sender and delete this message and its attachments.=0AAs=
 emails may be altered, Orange is not liable for messages that have been m=
odified, changed or falsified.=0AThank you.=0A</pre>=0A</div></div></block=
quote>=0A</body></html>
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From: "Pengshuping (Peng Shuping)" <pengshuping@huawei.com>
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Subject: [spring] SPRING Meeting Minutes @IETF110
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Hi all,

Please find the SPRING meeting minutes @IETF110.
https://codimd.ietf.org/notes-ietf-110-spring?view

If you have any comments, please send them to the list.

Please note that the minutes are going to be submitted and published. Thank=
 you!

Best regards,
Shuping

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please find the SPRING meeting =
minutes @IETF110.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://codimd.ietf.=
org/notes-ietf-110-spring?view">https://codimd.ietf.org/notes-ietf-110-spri=
ng?view</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If you have any comments, pleas=
e send them to the list.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please note that the minutes ar=
e going to be submitted and published. Thank you!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards, <o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Shuping <o:p></o:p></span></p>
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Date: Tue, 16 Mar 2021 12:35:51 +0800
From: "Chongfeng Xie" <chongfeng.xie@foxmail.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>,  "spring@ietf.org" <spring@ietf.org>
Cc: "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
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ccent 6"></w:LsdException>=0A</w:LatentStyles>=0A</xml><![endif]--><!--[if=
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style-parent:"";=0A	mso-padding-alt:0cm 5.4pt 0cm 5.4pt;=0A	mso-para-margi=
n:0cm;=0A	mso-para-margin-bottom:.0001pt;=0A	mso-pagination:widow-orphan;=
=0A	font-size:10.0pt;=0A	font-family:"Calibri",sans-serif;=0A	mso-bidi-fon=
t-family:"Times New Roman";=0A	mso-fareast-language:EN-US;}=0A</style><![e=
ndif]--><!--[if gte mso 9]><xml>=0A<o:shapedefaults v:ext=3D"edit" spidmax=
=3D"1026" ></o:shapedefaults>=0A</xml><![endif]--><!--[if gte mso 9]><xml>=
=0A<o:shapelayout v:ext=3D"edit">=0A<o:idmap v:ext=3D"edit" data=3D"1" ></=
o:idmap>=0A</o:shapelayout></xml><![endif]-->=0A<div><span></span>Hello, f=
olks,</div><div>I support this document to progress to IESG.&nbsp;</div><d=
iv><br></div><div>Best regards</div><div>Chongfeng</div>=0A<div><br></div>=
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" alig=
n=3D"left">=0A<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana;=
 FONT-SIZE: 10pt"><div>xiechf@chinatelecom.cn</div></div></span></div>=0A<=
blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m; margin-Right: inherit"><div>&nbsp;</div><div style=3D"border:none;borde=
r-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING=
-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#=
000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><=
b>From:</b>&nbsp;<a href=3D"mailto:bruno.decraene@orange.com" style=3D"col=
or: rgb(5, 99, 193); text-decoration: underline;">bruno.decraene@orange.co=
m</a></div><div><b>Date:</b>&nbsp;2021-03-05&nbsp;01:45</div><div><b>To:</=
b>&nbsp;<a href=3D"mailto:spring@ietf.org" style=3D"color: rgb(5, 99, 193)=
; text-decoration: underline;">spring@ietf.org</a></div><div><b>CC:</b>&nb=
sp;<a href=3D"mailto:draft-ietf-spring-nsh-sr@ietf.org" style=3D"color: rg=
b(5, 99, 193); text-decoration: underline;">draft-ietf-spring-nsh-sr@ietf.=
org</a></div><div><b>Subject:</b>&nbsp;Re: [spring] WG Last Call draft-iet=
f-spring-nsh-sr</div></div></div><div><div class=3D"FoxDiv2021031612304169=
7992">=0A<!--[if gte mso 9]><xml>=0A<o:OfficeDocumentSettings>=0A<o:RelyOn=
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family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D">Dear</span></span><span style=3D"mso-as=
cii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-fam=
ily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D=
">=0A WG,<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: =
0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span style=
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amily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Tim=
es New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">We received very=
 few support and review=0A so far: two reviews excluding the authors and i=
ncluding the shepherd.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" styl=
e=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;">=
<span lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-fo=
nt-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot=
;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Thanks Greg =
for the review.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span l=
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New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11=
pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-a=
scii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-fa=
mily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497=
D;mso-ansi-language:EN-US">To allow for more feedback, the WG last=0A call=
 is extended for two weeks until March 18.<o:p></o:p></span></p>=0A<p clas=
s=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; font-family: Ca=
libri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:Ca=
libri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bi=
di-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"mar=
gin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span la=
ng=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-famil=
y:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times N=
ew Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">In the meantime, aut=
hors are invited to=0A reply to the comments sent on the list.<o:p></o:p><=
/span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 1=
1pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-=
ascii-font-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-f=
amily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F49=
7D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"Mso=
Normal" style=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, s=
ans-serif;"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;ms=
o-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">=
Thanks,<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0p=
x 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"E=
N-US" style=3D"mso-ascii-font-family:Calibri;mso-fareast-font-family:Calib=
ri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roma=
n&quot;;color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></=
p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; fon=
t-family: Calibri, sans-serif;"><span lang=3D"EN-US" style=3D"mso-ascii-fo=
nt-family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Ca=
libri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-a=
nsi-language:EN-US"><o:p>&nbsp;</o:p></span></p>=0A<div style=3D"border:no=
ne;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">=0A<div>=0A<div=
 style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm=
 0cm">=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt;=
 font-family: Calibri, sans-serif;"><span class=3D"SpellE"><b><span style=
=3D"mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-fami=
ly:Calibri;mso-fareast-language:FR">From</span></b></span><b><span style=
=3D"mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-fami=
ly:Calibri;mso-fareast-language:FR">:</span></b><span style=3D"mso-fareast=
-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:Calibri;mso-=
fareast-language:FR">=0A<span class=3D"SpellE">spring</span> [mailto:sprin=
g-bounces@ietf.org] <b>On Behalf Of=0A</b>bruno.decraene@orange.com<br>=0A=
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>=0A<b>To:</b> spring@iet=
f.org<br>=0A<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>=0A<b>Subject:=
</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></span></p>=
=0A</div>=0A</div>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font=
-size: 11pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A<p=
 class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; font-famil=
y: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-language:E=
N-GB">Dear WG, <o:p>=0A</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D=
"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><spa=
n lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-=
language:EN-GB">This message starts a 2 weeks WG last call for draft-ietf-=
spring-nsh-sr [1].<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D=
"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><spa=
n lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></span=
></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-=
language:EN-GB">After review of the document please indicate whether you b=
elieve this document should be progressed to the IESG.<o:p></o:p></span></=
p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; fon=
t-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-lan=
guage:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><=
span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">In addition to yes/n=
o, please consider providing a technical review of this document; in parti=
cular if you care for this document.<o:p></o:p></span></p>=0A<p class=3D"M=
soNormal" style=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri,=
 sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">Indee=
d, since WG adoption, this document had benefited from little reviews from=
 the WG, so we need more review from the SPRING WG.=0A<o:p></o:p></span></=
p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; fon=
t-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-ansi-lan=
guage:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><=
span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB">If you are aware of =
an implementation of this document, please report the implementation eithe=
r on the list or to the chairs so that the shepherd can report implementat=
ions in the writeup.<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><=
span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></s=
pan></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11p=
t; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" style=3D"mso-an=
si-language:EN-GB">Note that I=E2=80=99ll forward that call to the SFC WG.=
<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; =
font-size: 11pt; font-family: Calibri, sans-serif;"><span lang=3D"EN-GB" s=
tyle=3D"mso-ansi-language:EN-GB"><o:p>&nbsp;</o:p></span></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; font-family: Cal=
ibri, sans-serif;">Thanks!<o:p></o:p></p>=0A<p class=3D"MsoNormal" style=
=3D"margin: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><=
o:p>&nbsp;</o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; fo=
nt-size: 11pt; font-family: Calibri, sans-serif;">[1] <a href=3D"https://t=
ools.ietf.org/html/draft-ietf-spring-nsh-sr" style=3D"color: rgb(5, 99, 19=
3); text-decoration: underline;">=0Ahttps://tools.ietf.org/html/draft-ietf=
-spring-nsh-sr</a><o:p></o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin=
: 0px 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;=
</o:p></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 1=
1pt; font-family: Calibri, sans-serif;">--Bruno<o:p></o:p></p>=0A<p class=
=3D"MsoNormal" style=3D"margin: 0px 0cm; font-size: 11pt; font-family: Cal=
ibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A<pre style=3D"margin: 0cm 0cm 0=
.0001pt; font-size: 10pt; font-family: &quot;Courier New&quot;;">_________=
__________________________________________________________________________=
______________________________________<o:p></o:p></pre>=0A<pre style=3D"ma=
rgin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot;Courier New&qu=
ot;;"><o:p>&nbsp;</o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; fo=
nt-size: 10pt; font-family: &quot;Courier New&quot;;">Ce message et ses pi=
eces jointes peuvent contenir des informations confidentielles ou privileg=
iees et ne doivent donc<o:p></o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0=
.0001pt; font-size: 10pt; font-family: &quot;Courier New&quot;;">pas etre =
diffuses, exploites ou copies sans autorisation. Si vous avez recu ce mess=
age par erreur, veuillez le signaler<o:p></o:p></pre>=0A<pre style=3D"marg=
in: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot;Courier New&quot=
;;">a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>=0A<pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot;Cou=
rier New&quot;;">Orange decline toute responsabilite si ce message a ete a=
ltere, deforme ou falsifie. Merci.<o:p></o:p></pre>=0A<pre style=3D"margin=
: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot;Courier New&quot;;=
"><o:p>&nbsp;</o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-s=
ize: 10pt; font-family: &quot;Courier New&quot;;">This message and its att=
achments may contain confidential or privileged information that may be pr=
otected by law;<o:p></o:p></pre>=0A<pre style=3D"margin: 0cm 0cm 0.0001pt;=
 font-size: 10pt; font-family: &quot;Courier New&quot;;">they should not b=
e distributed, used or copied without authorisation.<o:p></o:p></pre>=0A<p=
re style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot;=
Courier New&quot;;">If you have received this email in error, please notif=
y the sender and delete this message and its attachments.<o:p></o:p></pre>=
=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &=
quot;Courier New&quot;;">As emails may be altered, Orange is not liable fo=
r messages that have been modified, changed or falsified.<o:p></o:p></pre>=
=0A<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &=
quot;Courier New&quot;;">Thank you.<o:p></o:p></pre>=0A</div>=0A</div>=0A<=
pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">_____________________________________________________=
____________________________________________________________________=0ACe =
message et ses pieces jointes peuvent contenir des informations confidenti=
elles ou privilegiees et ne doivent donc=0Apas etre diffuses, exploites ou=
 copies sans autorisation. Si vous avez recu ce message par erreur, veuill=
ez le signaler=0Aa l'expediteur et le detruire ainsi que les pieces jointe=
s. Les messages electroniques etant susceptibles d'alteration,=0AOrange de=
cline toute responsabilite si ce message a ete altere, deforme ou falsifie=
. Merci.=0AThis message and its attachments may contain confidential or pr=
ivileged information that may be protected by law;=0Athey should not be di=
stributed, used or copied without authorisation.=0AIf you have received th=
is email in error, please notify the sender and delete this message and it=
s attachments.=0AAs emails may be altered, Orange is not liable for messag=
es that have been modified, changed or falsified.=0AThank you.=0A</pre>=0A=
</div></div></blockquote>=0A</body></html>
------=_001_NextPart551152284060_=------

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From: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
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Date: Tue, 16 Mar 2021 08:37:22 +0000
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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Hi WG,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">I have read this draft, and believe it=
 is technique sound and well-written. I support to move it forward.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">BRs,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Fan
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN">=B7=A2=BC=FE=C8=CB<s=
pan lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-fa=
mily:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;mso-fareast-language:Z=
H-CN"> spring [mailto:spring-bounces@ietf.org]
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif;mso-fareast-language:ZH-CN">=B4=FA=B1=ED
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN">bruno.decraene@orang=
e.com<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif;mso-fareast-language:ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D=
"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN"> 2021=
</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans=
-serif;mso-fareast-language:ZH-CN">=C4=EA<span lang=3D"EN-US">3</span>=D4=
=C2<span lang=3D"EN-US">5</span>=C8=D5<span lang=3D"EN-US">
 1:45<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> spring@ietf.org<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> draft-ietf-spring-nsh-sr@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> Re: [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></span></spa=
n></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Dear WG,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">We rece=
ived very few support and review so far: two reviews excluding the authors =
and including the shepherd.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
Greg for the review.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">To allo=
w for more feedback, the WG last call is extended for two weeks until March=
 18.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">In the =
meantime, authors are invited to reply to the comments sent on the list.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">--Bruno=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"mso-fareast-language:F=
R">From:</span></b><span lang=3D"FR" style=3D"mso-fareast-language:FR"> spr=
ing [</span><span lang=3D"EN-US"><a href=3D"mailto:spring-bounces@ietf.org"=
><span lang=3D"FR" style=3D"mso-fareast-language:FR">mailto:spring-bounces@=
ietf.org</span></a></span><span lang=3D"FR" style=3D"mso-fareast-language:F=
R">]
<b>On Behalf Of </b></span><span lang=3D"EN-US"><a href=3D"mailto:bruno.dec=
raene@orange.com"><span lang=3D"FR" style=3D"mso-fareast-language:FR">bruno=
.decraene@orange.com</span></a></span><span lang=3D"FR" style=3D"mso-fareas=
t-language:FR"><br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> </span><span lang=3D"EN-US"><a href=3D"mailto:spring@ietf.org"><=
span lang=3D"FR" style=3D"mso-fareast-language:FR">spring@ietf.org</span></=
a></span><span lang=3D"FR" style=3D"mso-fareast-language:FR"><br>
<b>Cc:</b> </span><span lang=3D"EN-US"><a href=3D"mailto:draft-ietf-spring-=
nsh-sr@ietf.org"><span lang=3D"FR" style=3D"mso-fareast-language:FR">draft-=
ietf-spring-nsh-sr@ietf.org</span></a></span><span lang=3D"FR" style=3D"mso=
-fareast-language:FR"><br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<o:p></o:p></=
span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I=A1=AFll forward tha=
t call to the SFC WG.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">Thanks!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">[1] </span><span lang=3D"EN-US"><a=
 href=3D"https://tools.ietf.org/html/draft-ietf-spring-nsh-sr"><span lang=
=3D"FR">https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</span></a></sp=
an><span lang=3D"FR"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
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tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
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<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
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<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
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<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
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</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
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<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
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Subject: [spring] Note for clarify with regards to draft-srcomdt-spring-compression-requirements-05
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Dear WG:

A quick note from the chairs for clarity with regards to draft-srcomdt-spri=
ng-compression and as a matter of process for future unrelated documents.

With regard to section 5.2 of draft-srcomdt-spring-compression-requirements=
-05, the chairs note that this is primarily an IETF process issue, not a te=
chnical issue about solutions.  The chairs also remind people of two aspect=
s of IETF process:


  1.  First, an IETF draft which modifies an existing PS or BCP requirement=
 will not be adopted by the SPRING WG without a corresponding document that=
 explicitly modifies or updates the requirement being sent for consideratio=
n by the relevant WG.
  2.  Second, the document which makes such a modification or update will n=
eed to be approved by the IETF working group which owns the existing requir=
ement before the SPRING document will be advanced out of the SPRING WG.

Thanks!

Jim, Joel & Bruno

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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Dear WG:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A quick note from the chairs for clarity with regard=
s to draft-srcomdt-spring-compression and as a matter of process for future=
 unrelated documents.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">With regard to section 5.2 of draft-srcomdt-spring-c=
ompression-requirements-05, the chairs note that this is primarily an IETF =
process issue, not a technical issue about solutions.&nbsp; The chairs also=
 remind people of two aspects of IETF process:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo1">First, an IETF draft which modifies an existing PS or BCP requirement=
 will not be adopted by the SPRING WG without a corresponding document that=
 explicitly modifies or updates the
 requirement being sent for consideration by the relevant WG.<o:p></o:p></l=
i><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level=
1 lfo1">Second, the document which makes such a modification or update will=
 need to be approved by the IETF working group which owns the existing requ=
irement before the SPRING document will
 be advanced out of the SPRING WG.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Jim, Joel &amp; Bruno<o:p></o:p></p>
</div>
</body>
</html>

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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Wed, 17 Mar 2021 19:49:39 +0530
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To: bruno.decraene@orange.com
Cc: "spring@ietf.org" <spring@ietf.org>,  "draft-ietf-spring-nsh-sr@ietf.org" <draft-ietf-spring-nsh-sr@ietf.org>
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Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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Hi WG,

I support the publication of this I-D. A few comments -

- Section 2
   A classifier SHOULD assign an NSH Service Path Identifier (SPI) per
   SR policy so that different traffic flows that use the same NSH
   Service Function Path (SFP) but different SR policy can coexist on
   the same SFP without conflict during SFF processing.

Why not MUST?

- Section 4, I suggest adding some recommendations related to the cache?
How long to keep (aging)? What happens in case of a cache miss? Should
these be set by the operator? Would be good from an operational point of
view to provide some more details related to caching.

- Section 4,

   The behavior of remembering the SR stack occurs at the end of the
   regularly defined logic.  The behavior of reattaching the stack
   occurs before the SR process of forwarding the packet to the next
   entry in the segment-list.  Both behaviors are further detailed in
   section 5.

The SR stack reads as SR-MPLS specific. Can this be generalized or perhaps
text added for SRv6 as well?

- Section 5, path-id is not used anywhere else; should it be mentioned that
this is Service Path Identifier (SPI)?

- Suggest adding a backward compatibility section to describe what is
likely to happen if an SFF does not support "Integrated NSH Service Plane"
but receives an NSHoSR packet.

Nits
- Remove references in the Abstract
- Should there be some reference to 3GPP in the first paragraph Section
1.1?
- Section 5, s/RFC 8754/[RFC8754]

Note
- There are 2 cases of Normative reference to Informational RFCs: RFC 8596
and 7665. Need to handle Downref registry during IETF LC.

Thanks!
Dhruv

On Thu, Mar 4, 2021 at 11:15 PM <bruno.decraene@orange.com> wrote:

> Dear WG,
>
>
>
> We received very few support and review so far: two reviews excluding the
> authors and including the shepherd.
>
> Thanks Greg for the review.
>
>
>
> To allow for more feedback, the WG last call is extended for two weeks
> until March 18.
>
>
>
> In the meantime, authors are invited to reply to the comments sent on the
> list.
>
>
>
> Thanks,
>
> --Bruno
>
>
>
> *From**:* spring [mailto:spring-bounces@ietf.org] *On Behalf Of *
> bruno.decraene@orange.com
> *Sent:* Tuesday, February 9, 2021 7:31 PM
> *To:* spring@ietf.org
> *Cc:* draft-ietf-spring-nsh-sr@ietf.org
> *Subject:* [spring] WG Last Call draft-ietf-spring-nsh-sr
>
>
>
> Dear WG,
>
>
>
> This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr
> [1].
>
>
>
> After review of the document please indicate whether you believe this
> document should be progressed to the IESG.
>
>
>
> In addition to yes/no, please consider providing a technical review of
> this document; in particular if you care for this document.
>
> Indeed, since WG adoption, this document had benefited from little review=
s
> from the WG, so we need more review from the SPRING WG.
>
>
>
> If you are aware of an implementation of this document, please report the
> implementation either on the list or to the chairs so that the shepherd c=
an
> report implementations in the writeup.
>
>
>
> Note that I=E2=80=99ll forward that call to the SFC WG.
>
>
>
> Thanks!
>
>
>
> [1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr
>
>
>
> --Bruno
>
>
>
> _________________________________________________________________________=
________________________________________________
>
>
>
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> _________________________________________________________________________=
________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
entielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
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> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
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--0000000000008926d005bdbc2ee6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:trebuche=
t ms,sans-serif;font-size:small;color:#073763">Hi WG,=C2=A0</div><div class=
=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;font-size:s=
mall;color:#073763"><br></div><div class=3D"gmail_default" style=3D"font-fa=
mily:trebuchet ms,sans-serif;font-size:small;color:#073763">I support the p=
ublication of this I-D. A few comments -=C2=A0</div><div class=3D"gmail_def=
ault" style=3D"font-family:trebuchet ms,sans-serif;font-size:small;color:#0=
73763"><br></div><div class=3D"gmail_default" style=3D"font-family:trebuche=
t ms,sans-serif;font-size:small;color:#073763">- Section 2<br>=C2=A0 =C2=A0=
A classifier SHOULD assign an NSH Service Path Identifier (SPI) per<br>=C2=
=A0 =C2=A0SR policy so that different traffic flows that use the same NSH<b=
r>=C2=A0 =C2=A0Service Function Path (SFP) but different SR policy can coex=
ist on<br>=C2=A0 =C2=A0the same SFP without conflict during SFF processing.=
<br><br>Why not MUST? <br><br>- Section 4, I suggest adding some recommenda=
tions related to the cache? How long to keep (aging)? What happens in case =
of a cache miss? Should these be set by the operator? Would be good from an=
 operational point of view to provide some more details related to caching.=
 <br><br>- Section 4, <br><br>=C2=A0 =C2=A0The behavior of remembering the =
SR stack occurs at the end of the<br>=C2=A0 =C2=A0regularly defined logic.=
=C2=A0 The behavior of reattaching the stack<br>=C2=A0 =C2=A0occurs before =
the SR process of forwarding the packet to the next<br>=C2=A0 =C2=A0entry i=
n the segment-list.=C2=A0 Both behaviors are further detailed in<br>=C2=A0 =
=C2=A0section 5.<br><br>The SR stack reads as SR-MPLS specific. Can this be=
 generalized or perhaps text added for SRv6 as well?=C2=A0<br><br>- Section=
 5, path-id is not used anywhere else; should it be mentioned that this is =
Service Path Identifier (SPI)? =C2=A0 <br><br>- Suggest adding a backward c=
ompatibility section to describe what is likely to happen if an SFF does no=
t support &quot;Integrated NSH Service Plane&quot; but receives an NSHoSR p=
acket. =C2=A0<br><br>Nits<br>- Remove references in the Abstract <br>- Shou=
ld there be some reference to 3GPP in the first paragraph Section 1.1? <br>=
- Section 5, s/RFC 8754/[RFC8754]<br><br>Note<br>- There are 2 cases of Nor=
mative reference to Informational RFCs: RFC 8596 and 7665. Need to handle D=
ownref registry during IETF LC.</div><div class=3D"gmail_default" style=3D"=
font-family:trebuchet ms,sans-serif;font-size:small;color:#073763"><br></di=
v><div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif=
;font-size:small;color:#073763">Thanks!=C2=A0</div><div class=3D"gmail_defa=
ult" style=3D"font-family:trebuchet ms,sans-serif;font-size:small;color:#07=
3763">Dhruv=C2=A0<br></div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Thu, Mar 4, 2021 at 11:15 PM &lt;<a href=3D"m=
ailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_-3424442279468720487WordSection1">
<p class=3D"MsoNormal"><span class=3D"gmail-m_-3424442279468720487SpellE"><=
span style=3D"color:rgb(31,73,125)">Dear</span></span><span style=3D"color:=
rgb(31,73,125)">
 WG,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
We received very few support and review
 so far: two reviews excluding the authors and including the shepherd.<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Thanks Greg for the review.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
To allow for more feedback, the WG last
 call is extended for two weeks until March 18.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
In the meantime, authors are invited to
 reply to the comments sent on the list.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Thanks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
--Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><span class=3D"gmail-m_-3424442279468720487SpellE"><=
b><span>From</span></b></span><b><span>:</span></b><span>
<span class=3D"gmail-m_-3424442279468720487SpellE">spring</span> [mailto:<a=
 href=3D"mailto:spring-bounces@ietf.org" target=3D"_blank">spring-bounces@i=
etf.org</a>] <b>On Behalf Of
</b><a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.de=
craene@orange.com</a><br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf=
.org</a><br>
<b>Cc:</b> <a href=3D"mailto:draft-ietf-spring-nsh-sr@ietf.org" target=3D"_=
blank">draft-ietf-spring-nsh-sr@ietf.org</a><br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr<u></u><u></u=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Dear WG, <u></u>
<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">This message starts a 2 weeks W=
G last call for draft-ietf-spring-nsh-sr [1].<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">After review of the document pl=
ease indicate whether you believe this document should be progressed to the=
 IESG.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">In addition to yes/no, please c=
onsider providing a technical review of this document; in particular if you=
 care for this document.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Indeed, since WG adoption, this=
 document had benefited from little reviews from the WG, so we need more re=
view from the SPRING WG.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If you are aware of an implemen=
tation of this document, please report the implementation either on the lis=
t or to the chairs so that the shepherd can report implementations in the w=
riteup.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Note that I=E2=80=99ll forward =
that call to the SFC WG.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">Thanks!<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">[1] <a href=3D"https://tools.ietf.org/html/draft-iet=
f-spring-nsh-sr" target=3D"_blank">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">--Bruno<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<pre>______________________________________________________________________=
___________________________________________________<u></u><u></u></pre>
<pre><u></u>=C2=A0<u></u></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<u></u><u></u></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<u></u><u></u></pre>
<pre>a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les me=
ssages electroniques etant susceptibles d&#39;alteration,<u></u><u></u></pr=
e>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<u></u><u></u></pre>
<pre><u></u>=C2=A0<u></u></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<u></u><u></u></pre>
<pre>they should not be distributed, used or copied without authorisation.<=
u></u><u></u></pre>
<pre>If you have received this email in error, please notify the sender and=
 delete this message and its attachments.<u></u><u></u></pre>
<pre>As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.<u></u><u></u></pre>
<pre>Thank you.<u></u><u></u></pre>
</div>
</div>
<pre>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div>

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Many thanks to Dave Sinicrope (WG Secretary) for taking the minutes!

Draft minutes have been posted:
https://datatracker.ietf.org/meeting/110/materials/minutes-110-pals

Please send comments and corrections to the PALS list only.

Cheers,
Andy

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<div dir=3D"ltr">Many thanks to Dave Sinicrope (WG Secretary) for taking th=
e minutes!<br><br>Draft minutes have been posted:<br><a href=3D"https://dat=
atracker.ietf.org/meeting/110/materials/minutes-110-pals">https://datatrack=
er.ietf.org/meeting/110/materials/minutes-110-pals</a><br><br>Please send c=
omments and corrections to the PALS list only.<br><br>Cheers,<br>Andy<div><=
br></div></div>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/yZA_dt_LcVQQcSS13WJHPEM_85A>
Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr
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Hi Everyone,

    I read through the document and support its publication.

Best Regards,
Huaimo



From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Tuesday, February 9, 2021 7:31 PM
To: spring@ietf.org
Cc: draft-ietf-spring-nsh-sr@ietf.org
Subject: [spring] WG Last Call draft-ietf-spring-nsh-sr



Dear WG,



This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]=
.



After review of the document please indicate whether you believe this docum=
ent should be progressed to the IESG.



In addition to yes/no, please consider providing a technical review of this=
 document; in particular if you care for this document.

Indeed, since WG adoption, this document had benefited from little reviews =
from the WG, so we need more review from the SPRING WG.



If you are aware of an implementation of this document, please report the i=
mplementation either on the list or to the chairs so that the shepherd can =
report implementations in the writeup.



Note that I=92ll forward that call to the SFC WG.



Thanks!



[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr<https://nam11.safe=
links.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fd=
raft-ietf-spring-nsh-sr&data=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C48ad=
db8e7e9d4b062ab108d8e7f5dfc4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C6=
37514390553318110%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM=
zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DUk4hs69ka6BrDYWwTEmiZhJcpN=
01p1wt2hAPO7ajQ9M%3D&reserved=3D0>



--Bruno



___________________________________________________________________________=
______________________________________________



Ce message et ses pieces jointes peuvent contenir des informations confiden=
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pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler

a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,

Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.



This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;

they should not be distributed, used or copied without authorisation.

If you have received this email in error, please notify the sender and dele=
te this message and its attachments.

As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.

Thank you.

___________________________________________________________________________=
______________________________________________



Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc

pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler

a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,

Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.



This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;

they should not be distributed, used or copied without authorisation.

If you have received this email in error, please notify the sender and dele=
te this message and its attachments.

As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.

Thank you.

--_000_MN2PR13MB4087FBD57AD21BC52AAF2BC0F2679MN2PR13MB4087namp_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Hi Everyone,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
&nbsp; &nbsp; I read through the document and support its publication.</div=
>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Best Regards,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Huaimo</div>
<div>
<div lang=3D"en-BE" style=3D"word-wrap:break-word">
<div class=3D"x_WordSection1">
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB" style=3D"color:#1F497D">&nbsp;</span></p>
<div style=3D"border:none; border-left:solid blue 1.5pt; padding:0cm 0cm 0c=
m 4.0pt">
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<b><span style=3D"">From:</span></b><span style=3D""> spring [mailto:spring=
-bounces@ietf.org]
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Tuesday, February 9, 2021 7:31 PM<br>
<b>To:</b> spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-nsh-sr@ietf.org<br>
<b>Subject:</b> [spring] WG Last Call draft-ietf-spring-nsh-sr</span></p>
</div>
</div>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
&nbsp;</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">Dear WG, </span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">This message starts a 2 weeks WG last call for draft-i=
etf-spring-nsh-sr [1].</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">After review of the document please indicate whether y=
ou believe this document should be progressed to the IESG.</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">In addition to yes/no, please consider providing a tec=
hnical review of this document; in particular if you care for this document=
.</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">Indeed, since WG adoption, this document had benefited=
 from little reviews from the WG, so we need more review from the SPRING WG=
.
</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">If you are aware of an implementation of this document=
, please report the implementation either on the list or to the chairs so t=
hat the shepherd can report implementations in the writeup.</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">Note that I=92ll forward that call to the SFC WG.</spa=
n></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
<span lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
Thanks!</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
&nbsp;</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
[1] <a href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%=
3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-nsh-sr&amp;data=3D04%7C01=
%7Chuaimo.chen%40futurewei.com%7C48addb8e7e9d4b062ab108d8e7f5dfc4%7C0fee8ff=
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xr2xp1EyV8SMEEsaQjVEiIu1XaWwws=3D">
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr</a></p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
&nbsp;</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
--Bruno</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0cm; font-size: 11pt; font-family=
: Calibri, sans-serif;">
&nbsp;</p>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">______________________________________________________=
___________________________________________________________________</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">&nbsp;</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">Ce message et ses pieces jointes peuvent contenir des =
informations confidentielles ou privilegiees et ne doivent donc</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">pas etre diffuses, exploites ou copies sans autorisati=
on. Si vous avez recu ce message par erreur, veuillez le signaler</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">a l'expediteur et le detruire ainsi que les pieces joi=
ntes. Les messages electroniques etant susceptibles d'alteration,</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">Orange decline toute responsabilite si ce message a et=
e altere, deforme ou falsifie. Merci.</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">&nbsp;</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">This message and its attachments may contain confident=
ial or privileged information that may be protected by law;</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">they should not be distributed, used or copied without=
 authorisation.</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">If you have received this email in error, please notif=
y the sender and delete this message and its attachments.</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">As emails may be altered, Orange is not liable for mes=
sages that have been modified, changed or falsified.</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">Thank you.</pre>
</div>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">______________________________________________________=
___________________________________________________________________</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">&nbsp;</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">Ce message et ses pieces jointes peuvent contenir des =
informations confidentielles ou privilegiees et ne doivent donc</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">pas etre diffuses, exploites ou copies sans autorisati=
on. Si vous avez recu ce message par erreur, veuillez le signaler</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
;Courier New&quot;;">a l'expediteur et le detruire ainsi que les pieces joi=
ntes. Les messages electroniques etant susceptibles d'alteration,</pre>
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: &quot=
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Jim, Joel & Bruno,

> On Mar 16, 2021, at 8:42 AM, James Guichard =
<james.n.guichard@futurewei.com> wrote:
>=20
> Dear WG:
>=20
> A quick note from the chairs for clarity with regards to =
draft-srcomdt-spring-compression and as a matter of process for future =
unrelated documents.
>=20
> With regard to section 5.2 of =
draft-srcomdt-spring-compression-requirements-05, the chairs note that =
this is primarily an IETF process issue, not a technical issue about =
solutions.  The chairs also remind people of two aspects of IETF =
process:
>=20
> 	=E2=80=A2 First, an IETF draft which modifies an existing PS or =
BCP requirement will not be adopted by the SPRING WG without a =
corresponding document that explicitly modifies or updates the =
requirement being sent for consideration by the relevant WG.
> 	=E2=80=A2 Second, the document which makes such a modification =
or update will need to be approved by the IETF working group which owns =
the existing requirement before the SPRING document will be advanced out =
of the SPRING WG.

I don=E2=80=99t see why a single document can=E2=80=99t update both.   =
IDs are allowed to update multiple documents, the changes need to be =
clear, but I don=E2=80=99t see why separate documents are required.  =
Please explain.

Bob



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Subject: Re: [spring] Note for clarify with regards to draft-srcomdt-spring-compression-requirements-05
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It can be the same document.  We could not find wording that made it 
clear that the update had to be approved by the owning WG, and that 
SPRING approval would be conditional on such.  And still alow for them 
being the same or different documents.

On the other hand, the usual practice has been to separate them as it 
makes for cleaner discussions.

Yours,
Joel

On 3/20/2021 12:49 PM, Bob Hinden wrote:
> Jim, Joel & Bruno,
> 
>> On Mar 16, 2021, at 8:42 AM, James Guichard <james.n.guichard@futurewei.com> wrote:
>>
>> Dear WG:
>>
>> A quick note from the chairs for clarity with regards to draft-srcomdt-spring-compression and as a matter of process for future unrelated documents.
>>
>> With regard to section 5.2 of draft-srcomdt-spring-compression-requirements-05, the chairs note that this is primarily an IETF process issue, not a technical issue about solutions.  The chairs also remind people of two aspects of IETF process:
>>
>> 	• First, an IETF draft which modifies an existing PS or BCP requirement will not be adopted by the SPRING WG without a corresponding document that explicitly modifies or updates the requirement being sent for consideration by the relevant WG.
>> 	• Second, the document which makes such a modification or update will need to be approved by the IETF working group which owns the existing requirement before the SPRING document will be advanced out of the SPRING WG.
> 
> I don’t see why a single document can’t update both.   IDs are allowed to update multiple documents, the changes need to be clear, but I don’t see why separate documents are required.  Please explain.
> 
> Bob
> 
> 


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Joel,

Thanks for clarifying.   I agree if the updated documents were done in =
separate w.g., then having separate documents makes sense.

Bob


> On Mar 20, 2021, at 10:22 AM, Joel M. Halpern <jmh@joelhalpern.com> =
wrote:
>=20
> It can be the same document.  We could not find wording that made it =
clear that the update had to be approved by the owning WG, and that =
SPRING approval would be conditional on such.  And still alow for them =
being the same or different documents.
>=20
> On the other hand, the usual practice has been to separate them as it =
makes for cleaner discussions.
>=20
> Yours,
> Joel
>=20
> On 3/20/2021 12:49 PM, Bob Hinden wrote:
>> Jim, Joel & Bruno,
>>> On Mar 16, 2021, at 8:42 AM, James Guichard =
<james.n.guichard@futurewei.com> wrote:
>>>=20
>>> Dear WG:
>>>=20
>>> A quick note from the chairs for clarity with regards to =
draft-srcomdt-spring-compression and as a matter of process for future =
unrelated documents.
>>>=20
>>> With regard to section 5.2 of =
draft-srcomdt-spring-compression-requirements-05, the chairs note that =
this is primarily an IETF process issue, not a technical issue about =
solutions.  The chairs also remind people of two aspects of IETF =
process:
>>>=20
>>> 	=E2=80=A2 First, an IETF draft which modifies an existing PS or =
BCP requirement will not be adopted by the SPRING WG without a =
corresponding document that explicitly modifies or updates the =
requirement being sent for consideration by the relevant WG.
>>> 	=E2=80=A2 Second, the document which makes such a modification =
or update will need to be approved by the IETF working group which owns =
the existing requirement before the SPRING document will be advanced out =
of the SPRING WG.
>> I don=E2=80=99t see why a single document can=E2=80=99t update both.  =
 IDs are allowed to update multiple documents, the changes need to be =
clear, but I don=E2=80=99t see why separate documents are required.  =
Please explain.
>> Bob


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To: last-call@ietf.org, draft-ietf-6man-spring-srv6-oam@ietf.org,  6man WG <ipv6@ietf.org>, 6man Chairs <6man-chairs@ietf.org>, spring <spring@ietf.org>
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Subject: [spring] Last-call comments on OAM in SRv6 draft
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Dear Authors, 6man and SPRING community,
I have read this draft and have several comments I want to share with you.
The draft is well-written and I appreciate the work authors put into it.
OAM is the essential element of any networking technology and I believe it
is important that this document will be published soon after the
publication of RFC 8754. Below, please find my comments and questions, some
are just an editorial while some may have more technical impact on the
document. I appreciate your kind consideration.

   - As I understand the document, it consists of two parts - informational
   and standardization. The informational part explains how existing
   mechanisms like ICMPv6 can be applied in the SRv6 environment. Also, the
   applicability of RFC 8403 is explained. In the standardization part, the
   O-flag is defined and its processing described. I am concerned that that
   part of the draft is significantly underdeveloped as the threats that are
   created by the introduction of the O-flag are not identified and protection
   mechanisms are not sufficiently discussed, specified. As it appears, the
   O-flag use in SRv6 is very much similar to what already and for a long time
   has been achieved by using ACLs - sampling data flows. Though managing ACL
   may be operationally intensive, that is a well-secured process. Using
   O-flag that can be exploited by an attacker without sufficient protection,
   as currently defined in the draft, is risky and raises the question of
   benefit vs. risk. It might be that the benefit of the O-flag is marginal
   comparing to the risk and complexity its introductions brings in SRv6.
   - in the Introduction section, you've noted that the document

"... includes illustrations of pinging an SRv6 SID for the SID connectivity
checks and to validate the availability of a SID ..."

We know of two modes of path verification - continuity check (CC) and
connectivity verification (CV). The former demonstrates whether there is a
path between two network systems. The latter - is to verify that only
packets transmitted on that particular connection reach the system. If
these commonly accepted definitions of CC and CV also applicable in this
document, what is verified by "SID connectivity check"?

Also, can you point to the definition of availability metric that,
according to the statement, is being validated by pinging a SID?


   - if "classic IPv6 loopback address", as the document suggests is
   "2001:DB8:A:k::/128", perhaps you can point out a document that established
   that tradition.
   - The O-flag has been introduced as

   The O-flag in SRH is used as a marking-bit in the user packets to
   trigger the telemetry data collection and export at the segment
   endpoints.
I think that the definition leaves an open question of whether the O-flag
can be set in a test packet originated in the SRv6 domain. For example, can
the O-flag be set on BFD control packets periodically transmitted by the
SRv6 node?


   - Pseudocode S01.1 suggests that an implementation that supports the
   O-flag makes a copy of the marked packet and punts that copy to the control
   plane. Such processing seems to create a new DoS attack vector even though
   the Security Considerations section does not acknowledge that. It appears
   that that part of processing should be discussed in the Security
   Considerations section and mechanisms to mitigate the threat explained.
   - In the explanation of traceroute through the reference model some
   entity is referenced as hop2. What is it?
   - Perhaps s/SRv6 capable/SRv6-capable/
   - Section 3.2.2 describes SID tracing using UDP transport for a test
   packet. I couldn't find information on the selection of the destination UDP
   port number for tracing SID. What is it?
   - Should note that the method to sample a data flow, described in
   Section 3.3, is similar to what can be achieved using IOAM's Direct
   Export trace type
   <https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-direct-export/>.
   Also, the Hybrid Two-Step method of collecting the telemetry information
   <https://datatracker.ietf.org/doc/draft-mirsky-ippm-hybrid-two-step/>
   may result in fewer additional packets and simplify the correlation of the
   collected data.

Regards,
Greg

--00000000000078db6f05bdfe2a48
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<div dir=3D"ltr">Dear Authors, 6man and SPRING community,<div>I have read t=
his draft and have several comments=C2=A0I want to share with you.</div><di=
v>The draft is well-written and I appreciate the work authors put into it. =
OAM is the essential element of any networking technology and I believe it =
is important that this document will be published soon after the publicatio=
n of RFC 8754. Below, please find my comments and questions,=C2=A0some are =
just an editorial while some may have more technical impact on the document=
. I appreciate your kind consideration.</div><div><ul><li>As I understand t=
he document, it consists of two parts - informational and standardization. =
The informational part explains how existing mechanisms like ICMPv6 can be =
applied in the SRv6 environment. Also, the applicability of RFC 8403 is exp=
lained. In the standardization part, the O-flag is defined and its processi=
ng described. I am concerned that that part of the draft is significantly=
=C2=A0underdeveloped as the threats that are created by the introduction of=
 the O-flag are not identified and protection mechanisms are not sufficient=
ly discussed, specified. As it appears, the O-flag use in SRv6 is very much=
 similar to what already and for a long time has been achieved by using ACL=
s - sampling data flows. Though managing ACL may be operationally intensive=
, that is a well-secured process. Using O-flag that can be exploited by an =
attacker without sufficient protection, as currently defined in the draft, =
is risky and raises the question of benefit vs. risk. It might be that the =
benefit of the O-flag is marginal comparing to the risk and complexity its =
introductions brings in SRv6.</li><li>in the Introduction section, you&#39;=
ve noted that the document</li></ul></div><blockquote style=3D"margin:0 0 0=
 40px;border:none;padding:0px"><div>&quot;... includes illustrations of pin=
ging an SRv6 SID for the SID connectivity checks and to validate the availa=
bility of a SID ...&quot;</div></blockquote><blockquote style=3D"margin:0 0=
 0 40px;border:none;padding:0px"><div>We know of two modes of path verifica=
tion - continuity check (CC) and connectivity verification (CV). The former=
 demonstrates whether there is a path between two network systems. The latt=
er - is to verify that only packets transmitted on that particular connecti=
on reach the system. If these commonly accepted definitions of CC and CV al=
so applicable in this document, what is verified by &quot;SID connectivity =
check&quot;?</div></blockquote><blockquote style=3D"margin:0 0 0 40px;borde=
r:none;padding:0px"><div>Also, can you point=C2=A0to the definition of avai=
lability metric that, according to the statement, is being validated by pin=
ging a SID?</div></blockquote><ul><li>if &quot;classic IPv6 loopback addres=
s&quot;, as the document suggests is &quot;2001:DB8:A:k::/128&quot;, perhap=
s you can point out a document that established that tradition.</li><li>The=
 O-flag has been introduced as</li></ul><blockquote style=3D"margin:0 0 0 4=
0px;border:none;padding:0px">=C2=A0 =C2=A0The O-flag in SRH is used as a ma=
rking-bit in the user packets to<br>=C2=A0 =C2=A0trigger the telemetry data=
 collection and export at the segment<br>=C2=A0 =C2=A0endpoints.<br>I think=
 that the definition leaves an open question of whether the O-flag can be s=
et in a test packet originated in the SRv6 domain. For example, can the O-f=
lag be set on BFD control packets periodically transmitted by the SRv6 node=
?<br></blockquote><ul><li>Pseudocode=C2=A0S01.1 suggests that an implementa=
tion that supports the O-flag makes a copy of the marked packet and punts t=
hat copy to the control plane. Such processing=C2=A0seems to create a new D=
oS attack vector even though the Security Considerations section does not a=
cknowledge that. It appears that that part of processing should be discusse=
d in the Security Considerations section and mechanisms to mitigate the thr=
eat explained.</li><li>In the explanation=C2=A0of traceroute through the re=
ference model some entity is referenced as hop2. What is it?</li><li>Perhap=
s s/SRv6 capable/SRv6-capable/</li><li>Section 3.2.2 describes SID tracing =
using UDP transport for a test packet. I couldn&#39;t find information on t=
he selection of the destination UDP port number for tracing SID. What is it=
?</li><li>Should note that the method to sample a data flow, described in S=
ection 3.3, is similar to what can be achieved using=C2=A0<a href=3D"https:=
//datatracker.ietf.org/doc/draft-ietf-ippm-ioam-direct-export/">IOAM&#39;s =
Direct Export trace type</a>. Also, the <a href=3D"https://datatracker.ietf=
.org/doc/draft-mirsky-ippm-hybrid-two-step/">Hybrid Two-Step method of coll=
ecting the telemetry information</a> may result in fewer additional packets=
 and simplify the correlation of the collected data.=C2=A0</li></ul><div>Re=
gards,</div><div>Greg</div></div>

--00000000000078db6f05bdfe2a48--


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Subject: [spring] I-D Action: draft-ietf-spring-bfd-01.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           : Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane
        Authors         : Greg Mirsky
                          Jeff  Tantsura
                          Ilya Varlashkin
                          Mach(Guoyi) Chen
                          Jiang Wenying
	Filename        : draft-ietf-spring-bfd-01.txt
	Pages           : 15
	Date            : 2021-03-22

Abstract:
   Segment Routing (SR) architecture leverages the paradigm of source
   routing.  It can be realized in the Multiprotocol Label Switching
   (MPLS) network without any change to the data plane.  A segment is
   encoded as an MPLS label, and an ordered list of segments is encoded
   as a stack of labels.  Bidirectional Forwarding Detection (BFD) is
   expected to monitor any existing path between systems.  This document
   defines how to use Label Switched Path Ping to bootstrap a BFD
   session, control an SR Policy in the reverse direction of the SR-MPLS
   tunnel, and applicability of BFD Demand mode in the SR-MPLS domain.
   Also, the document describes the use of BFD Echo with BFD Control
   packet payload.


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

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-spring-bfd-01.html

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



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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>, "spring@ietf.org" <spring@ietf.org>, "Rishabh Parekh (riparekh)" <riparekh@cisco.com>, "Arvind Venkateswaran (arvvenka)" <arvvenka@cisco.com>
Thread-Topic: Comments on draft-geng-spring-sr-redundancy-protection
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Date: Thu, 25 Mar 2021 19:18:39 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/I0mYtJogAAX1-muVqUylAsAD6Wc>
Subject: [spring] Comments on draft-geng-spring-sr-redundancy-protection
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From: "Yangfan (IP Standard)" <shirley.yangfan@huawei.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>, "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>, "spring@ietf.org" <spring@ietf.org>, "Rishabh Parekh (riparekh)" <riparekh@cisco.com>, "Arvind Venkateswaran (arvvenka)" <arvvenka@cisco.com>
Thread-Topic: Comments on draft-geng-spring-sr-redundancy-protection
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<p class=3D"MsoPlainText"><span lang=3D"EN-US">Hi Jeffrey,<o:p></o:p></span=
></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Thank you for the comments, =
please see the reply inline starts with [FY#].<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Cheers,<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Fan <o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">-----</span><span style=3D"f=
ont-family:=CB=CE=CC=E5">=D3=CA=BC=FE=D4=AD=BC=FE</span><span lang=3D"EN-US=
">-----<br>
</span><span style=3D"font-family:=CB=CE=CC=E5">=B7=A2=BC=FE=C8=CB</span><s=
pan lang=3D"EN-US">: spring [mailto:spring-bounces@ietf.org]
</span><span style=3D"font-family:=CB=CE=CC=E5">=B4=FA=B1=ED</span> <span l=
ang=3D"EN-US">Jeffrey (Zhaohui) Zhang<br>
</span><span style=3D"font-family:=CB=CE=CC=E5">=B7=A2=CB=CD=CA=B1=BC=E4</s=
pan><span lang=3D"EN-US">: 2021</span><span style=3D"font-family:=CB=CE=CC=
=E5">=C4=EA</span><span lang=3D"EN-US">3</span><span style=3D"font-family:=
=CB=CE=CC=E5">=D4=C2</span><span lang=3D"EN-US">26</span><span style=3D"fon=
t-family:=CB=CE=CC=E5">=C8=D5</span><span lang=3D"EN-US">
 3:19<br>
</span><span style=3D"font-family:=CB=CE=CC=E5">=CA=D5=BC=FE=C8=CB</span><s=
pan lang=3D"EN-US">: Gengxuesong (Geng Xuesong) &lt;gengxuesong@huawei.com&=
gt;; spring@ietf.org; Rishabh Parekh (riparekh) &lt;riparekh@cisco.com&gt;;=
 Arvind Venkateswaran (arvvenka) &lt;arvvenka@cisco.com&gt;<br>
</span><span style=3D"font-family:=CB=CE=CC=E5">=D6=F7=CC=E2</span><span la=
ng=3D"EN-US">: [spring] Comments on draft-geng-spring-sr-redundancy-protect=
ion</span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Hi Xuesong, Mach, Fan,<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Some comments/questions on t=
he proposal.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">1. We don't need an addition=
al &quot;redundancy segment&quot; for the replication semantics. Existing &=
quot;replication segment&quot; (draft-ietf-spring-sr-replication-segment) c=
an be used as is, especially for the scenario where the
 original header already carries (FI, SN) information.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">------[FY1]: three considera=
tions here:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">a). For the scenario you men=
tioned, that is correct, redundancy segment and replication segment share a=
 common behavior of &quot;packet duplication&quot;. The significant
 difference between two segments is the behavior of adding FI and SN. Unfor=
tunately, there is no application in SRv6 required to carry (FI,SN) informa=
tion in IPv6 header, which results in a more common scenario is where the o=
riginal packet doesn't carry (FI,
 SN). So the current design of redundancy segment is based on this scenario=
. <o:p>
</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">b). Even though IPv6 flow la=
bel could be encapsulated in header, it is used for ECMP or fragmentation, =
redundancy protection cannot simply reuse it since
 flow ID allocation has dependency on the merging node capability. <o:p></o=
:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">c). In protocol design, it i=
s important to maximally reuse the existing implementation. However, instan=
tiation of a segment is a different story. In RFC8986,
 there are 14 End behaviors and 4 headend behaviors defined. We understand =
the principle here is to keep the semantics of a segment and further functi=
ons definition neat to make the segment routing forwarding clear and effici=
ent. To enhance the replication
 segment to support redundancy segment seems quite an opposite methodology.=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-family:&quot;Y=
u Gothic UI&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">2. Even for the scenario whe=
re the (FI, SN) information needs to be added by the redundancy node, the e=
xisting &quot;replication segment&quot; can be enhanced to add the (FI, SN)=
 information.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">-----[FY2]: Replication segm=
ent provides P2MP replication with target of supporting multicast service, =
and redundancy segment aims to provide redundant
 flow protection to URLLC services. Adding (FI, SN) doesn=A1=AFt bring valu=
e to multicast services, and having the stitching capability of replication=
 on redundancy node seems a waste and unpractical to URLLC service. Twistin=
g them together in one segment results
 in a complicated function, where maybe only one type of service is require=
d on the node.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">3. I wonder why (FI, SN) inf=
ormation is added as a TLV in the SRH. Would it be better to use DOH?<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">-----[FY3]: If the (FI,SN) i=
s encapsulated in type of TLV, both SRH and DOH are feasible. Actually (FI,=
SN) information is only meaningful to merging node,
 putting them in the arg part of replication segment doesn't help. <o:p></o=
:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"color:black"><o:p>&=
nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">For #1, and #2, reusing/enha=
ncing existing replication segment has the following benefits:<o:p></o:p></=
span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">a. Reduce protocol/implement=
ation work<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">b. Reduce the amount of stat=
e in the network (the same P2MP tunnel can be used for both multicast traff=
ic and unicast redundancy)<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">b) can be achieved even with=
 #2 (redundancy node needs to add (FI, SN) information): for SRv6, the sema=
ntics of adding (FI, SN) can be indicated by the arg part of the replicatio=
n SID and for SR-MPLS it can be indicated
 by an additional label in front of the replication sid label. If using an =
addition label is a concern, then indeed a single label can be used to indi=
cate both &quot;add FI/SN information&quot; and &quot;replicate&quot;, but =
still the replication semantics can still be set up
 using the replication segment infrastructure.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">For SR-MPLS, where would you=
 put the (FI, SN) information? Seems that GDFH (draft-zzhang-intarea-generi=
c-delivery-functions) is a good option and that can be used for SRv6 as wel=
l (anything in DOH that is actually
 independent of IP could be extracted out to GDFH).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Yu Gothic UI&quot;,sans-serif">-----[FY4]: For SR-MPLS, cur=
rently the authors plan to keep consistent with specification in RFC8964. T=
he original intention of this draft is to provide
 a PREOF solution in SR data plane to DetNet. What's why the draft is discu=
ssed first in DetNet then comes to SPRING. And FYI, DetNet MPLS data plane =
uses a separate service label (S-Label) and PW MPLS Control Word [RFC4385] =
to carry FI and SN.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Jeffrey<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Juniper Business Use Only<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">____________________________=
___________________<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">spring mailing list<o:p></o:=
p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><a href=3D"mailto:spring@iet=
f.org"><span style=3D"color:windowtext;text-decoration:none">spring@ietf.or=
g</span></a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><a href=3D"https://www.ietf.=
org/mailman/listinfo/spring"><span style=3D"color:windowtext;text-decoratio=
n:none">https://www.ietf.org/mailman/listinfo/spring</span></a><o:p></o:p><=
/span></p>
</div>
</body>
</html>

--_000_59384be985ae4d3bb9563bed2642bff1huaweicom_--


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From: "Weiqiang Cheng" <chengweiqiang@chinamobile.com>
To: "'SPRING WG List'" <spring@ietf.org>
Cc: "'srcomp'" <srcomp@ietf.org>, <spring-chairs@ietf.org>
Date: Mon, 29 Mar 2021 11:55:49 +0800
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Hi Group,
There were some comments on section 5.2 of =
draft-srcomdt-spring-compression-requirements-05 which is about the PS =
or BCP Compliance.
Design team had discussed the comments with group chairs. We believe it =
is about an IETF process, not a technical topic.=20
So we removed the chapter and generated -06 revision.

So far, DT have resolved all the comments received and believe the draft =
is mature.

We would like to ask for WG Adoption call for draft.

B.R.
Weiqiang Cheng


-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org =
[mailto:internet-drafts@ietf.org]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B43=E6=9C=8829=E6=97=A5 =
11:36
=E6=94=B6=E4=BB=B6=E4=BA=BA: Cheng Li; Chongfeng Xie; Darren Dukes; Peng =
Shaofu; Ron Bonica; Shaofu Peng; Weiqiang Cheng; Wim Henderickx
=E4=B8=BB=E9=A2=98: New Version Notification for =
draft-srcompdt-spring-compression-requirement-06.txt


A new version of I-D, =
draft-srcompdt-spring-compression-requirement-06.txt
has been successfully submitted by Weiqiang Cheng and posted to the
IETF repository.

Name:		draft-srcompdt-spring-compression-requirement
Revision:	06
Title:		Compressed SRv6 SID List Requirements
Document date:	2021-03-29
Group:		Individual Submission
Pages:		16
URL:            =
https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-require=
ment-06.txt
Status:         =
https://datatracker.ietf.org/doc/draft-srcompdt-spring-compression-requir=
ement/
Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-r=
equirement
Htmlized:       =
https://tools.ietf.org/html/draft-srcompdt-spring-compression-requirement=
-06
Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-srcompdt-spring-compression-req=
uirement-06

Abstract:
   This document specifies requirements for solutions to compress SRv6
   SID lists.

                                                                         =
        =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.

The IETF Secretariat






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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Yangfan (IP Standard" <shirley.yangfan@huawei.com>, "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>, "'Rishabh Parekh (riparekh)'" <riparekh@cisco.com>, "'Arvind Venkateswaran (arvvenka)'" <arvvenka@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Comments on draft-geng-spring-sr-redundancy-protection
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Date: Mon, 29 Mar 2021 21:06:08 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/RRR610la_6xBSkj4z4qfJ7jrUxw>
Subject: Re: [spring] Comments on draft-geng-spring-sr-redundancy-protection
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From: Greg Mirsky <gregimirsky@gmail.com>
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Content-Type: text/plain; charset="UTF-8"

Dear SPRING WG Chairs,
this draft addresses the use of BFD over p2p and p2mp SR tunnels with the
MPLS data plane. The draft is stable. The authors would appreciate your
consideration to start the WG LC for this draft.

Regards,
Greg

---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Mon, Mar 22, 2021 at 8:53 AM
Subject: New Version Notification for draft-ietf-spring-bfd-01.txt
To: Mach Chen (Guoyi) <mach.chen@huawei.com>, Greg Mirsky <
gregimirsky@gmail.com>, Ilya Varlashkin <Ilya@nobulus.com>, Ilya Varlashkin
<ilya@nobulus.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, Jiang Wenying <
jiangwenying@chinamobile.com>, <spring-chairs@ietf.org>



A new version of I-D, draft-ietf-spring-bfd-01.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:           draft-ietf-spring-bfd
Revision:       01
Title:          Bidirectional Forwarding Detection (BFD) in Segment Routing
Networks Using MPLS Dataplane
Document date:  2021-03-22
Group:          spring
Pages:          15
URL:            https://www.ietf.org/archive/id/draft-ietf-spring-bfd-01.txt
Status:         https://datatracker.ietf.org/doc/draft-ietf-spring-bfd/
Html:
https://www.ietf.org/archive/id/draft-ietf-spring-bfd-01.html
Htmlized:       https://tools.ietf.org/html/draft-ietf-spring-bfd-01
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-bfd-01

Abstract:
   Segment Routing (SR) architecture leverages the paradigm of source
   routing.  It can be realized in the Multiprotocol Label Switching
   (MPLS) network without any change to the data plane.  A segment is
   encoded as an MPLS label, and an ordered list of segments is encoded
   as a stack of labels.  Bidirectional Forwarding Detection (BFD) is
   expected to monitor any existing path between systems.  This document
   defines how to use Label Switched Path Ping to bootstrap a BFD
   session, control an SR Policy in the reverse direction of the SR-MPLS
   tunnel, and applicability of BFD Demand mode in the SR-MPLS domain.
   Also, the document describes the use of BFD Echo with BFD Control
   packet payload.




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

--000000000000299bdf05beb5a6db
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear SPRING WG Chairs,<div>this draft addresses the use of=
 BFD over p2p and p2mp SR tunnels with the MPLS data plane. The draft is st=
able. The authors would appreciate your consideration to start the WG LC fo=
r this draft.</div><div><br></div><div>Regards,</div><div>Greg<br><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forw=
arded message ---------<br>From: <span dir=3D"auto">&lt;<a href=3D"mailto:i=
nternet-drafts@ietf.org">internet-drafts@ietf.org</a>&gt;</span><br>Date: M=
on, Mar 22, 2021 at 8:53 AM<br>Subject: New Version Notification for draft-=
ietf-spring-bfd-01.txt<br>To: Mach Chen (Guoyi) &lt;<a href=3D"mailto:mach.=
chen@huawei.com">mach.chen@huawei.com</a>&gt;, Greg Mirsky &lt;<a href=3D"m=
ailto:gregimirsky@gmail.com">gregimirsky@gmail.com</a>&gt;, Ilya Varlashkin=
 &lt;<a href=3D"mailto:Ilya@nobulus.com">Ilya@nobulus.com</a>&gt;, Ilya Var=
lashkin &lt;<a href=3D"mailto:ilya@nobulus.com">ilya@nobulus.com</a>&gt;, J=
eff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com">jefftant.ietf@g=
mail.com</a>&gt;, Jiang Wenying &lt;<a href=3D"mailto:jiangwenying@chinamob=
ile.com">jiangwenying@chinamobile.com</a>&gt;,  &lt;<a href=3D"mailto:sprin=
g-chairs@ietf.org">spring-chairs@ietf.org</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-ietf-spring-bfd-01.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-ietf-spring-bfd<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A001<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection=
 (BFD) in Segment Routing Networks Using MPLS Dataplane<br>
Document date:=C2=A0 2021-03-22<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 spring<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 15<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/archive/id/draft-ietf-spring-bfd-01.txt" rel=3D"noreferrer" target=3D"_b=
lank">https://www.ietf.org/archive/id/draft-ietf-spring-bfd-01.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-ietf-spring-bfd/" rel=3D"noreferrer" target=3D"_blank">http=
s://datatracker.ietf.org/doc/draft-ietf-spring-bfd/</a><br>
Html:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/archive/id/draft-ietf-spring-bfd-01.html" rel=3D"noreferrer" target=3D"_=
blank">https://www.ietf.org/archive/id/draft-ietf-spring-bfd-01.html</a><br=
>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-ietf-spring-bfd-01" rel=3D"noreferrer" target=3D"_blank">https://tool=
s.ietf.org/html/draft-ietf-spring-bfd-01</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-ietf-spring-bfd-01" rel=3D"noreferrer" target=3D"_b=
lank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-bfd-01</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Segment Routing (SR) architecture leverages the paradigm of so=
urce<br>
=C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S=
witching<br>
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s=
egment is<br>
=C2=A0 =C2=A0encoded as an MPLS label, and an ordered list of segments is e=
ncoded<br>
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection=
 (BFD) is<br>
=C2=A0 =C2=A0expected to monitor any existing path between systems.=C2=A0 T=
his document<br>
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap a BFD=
<br>
=C2=A0 =C2=A0session, control an SR Policy in the reverse direction of the =
SR-MPLS<br>
=C2=A0 =C2=A0tunnel, and applicability of BFD Demand mode in the SR-MPLS do=
main.<br>
=C2=A0 =C2=A0Also, the document describes the use of BFD Echo with BFD Cont=
rol<br>
=C2=A0 =C2=A0packet payload.<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>
<br>
</div></div></div>

--000000000000299bdf05beb5a6db--


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From: "Francois Clad (fclad)" <fclad@cisco.com>
To: "Pengshuping (Peng Shuping)" <pengshuping@huawei.com>, "Luc-Fabrice Ndifor Ngwa [ MTN Cameroon ]" <Luc-Fabrice.Ndifor@mtn.com>
CC: "'spring@ietf.org'" <spring@ietf.org>, "apn@ietf.org" <apn@ietf.org>
Thread-Topic: SRv6 Service Programming using TLV
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Date: Wed, 31 Mar 2021 16:11:11 +0000
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