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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "chrisbowers.ietf@gmail.com" <chrisbowers.ietf@gmail.com>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, Andrew Malis <Andrew.Malis@huawei.com>
Subject: Need presentation slot in  RTGwg at IETF100
Thread-Topic: Need presentation slot in  RTGwg at IETF100
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Jeff and Chris,

Can you give us 15 ~20 minutes time to present VPN Extension to Dynamic Clo=
ud DC?
Here are some of the reasons we propose the topic:
We want to bring general awareness of problems and use cases that have been=
 discussed by ONUG (Open Network User Group) community. I have been partici=
pating in ONUG (Open Network User Group) discussion for over a year. (p.s. =
SD-WAN was conceived in ONUG about 4 years ago). ONUG is enterprises (users=
) driven community, focusing on their highly desired use cases and problems=
 they face in the digital transformation. Today, one of the hot topic in ON=
UG is about Enterprises wanting to move workloads to cloud.
We also summarize some of the gaps of the enterprises utilizing abundant Cl=
oud DC (i.e. 3rd party DC that hosts workloads from different users) resour=
ces in the process of embracing digital transformation.
Even though not all use cases and problems can be directly translated to IE=
TF solvable problems, many of them are worthwhile to bring to IETF attentio=
n, especially from routing area.
We tried to put together drafts to describe the problems and gaps for enter=
prises to connect their workloads in 3rd party cloud DC, but the drafts alo=
ne don't have the original use cases (voted by enterprises participating in=
 ONUG), or may not stimulate in-depth discussion.
https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-problem-s=
tatement-01.txt
https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-gap-analy=
sis-00.txt

Linda

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<p class=3D"MsoNormal">Jeff and Chris, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Can you give us 15 ~20 minutes time to present VPN E=
xtension to Dynamic Cloud DC?
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Here are some of the reasons we propose the topic:&nbsp;<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">We want to bring general awareness of problems and use cases that =
have been discussed by ONUG (Open Network User Group) community. I have bee=
n participating in ONUG (Open Network
 User Group) discussion for over a year. (p.s. SD-WAN was conceived in ONUG=
 about 4 years ago). ONUG is enterprises (users) driven community, focusing=
 on their highly desired use cases and problems they face in the digital tr=
ansformation. Today, one of the
 hot topic in ONUG is about Enterprises wanting to move workloads to cloud.=
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">We also summarize some of the gaps of the enterprises utilizing ab=
undant Cloud DC (i.e. 3rd party DC that hosts workloads from different user=
s) resources in the process of embracing
 digital transformation. <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Even though not all use cases and problems can be directly transla=
ted to IETF solvable problems, many of them are worthwhile to bring to IETF=
 attention, especially from routing
 area. <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">We tried to put together drafts to describe the problems and gaps =
for enterprises to connect their workloads in 3rd party cloud DC, but the d=
rafts alone don&#8217;t have the original
 use cases (voted by enterprises participating in ONUG), or may not stimula=
te in-depth discussion. &nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><a href=3D"https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-t=
o-cloud-dc-problem-statement-01.txt"><span style=3D"color:#0563C1">https://=
www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-problem-statement=
-01.txt</span></a><span style=3D"font-size:12.0pt;font-family:&quot;Times N=
ew Roman&quot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><a href=3D"https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-t=
o-cloud-dc-gap-analysis-00.txt"><span style=3D"color:#0563C1">https://www.i=
etf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-gap-analysis-00.txt</s=
pan></a><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&q=
uot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Linda<o:p></o:p></p>
</div>
</body>
</html>

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Date: Thu, 02 Nov 2017 22:58:08 -0700
Subject: Re: Need presentation slot in  RTGwg at IETF100
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Linda Dunbar <linda.dunbar@huawei.com>, "chrisbowers.ietf@gmail.com" <chrisbowers.ietf@gmail.com>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, Andrew Malis <Andrew.Malis@huawei.com>
Message-ID: <0EDFE1BE-5CEC-4FD7-9363-58C1FC576C23@gmail.com>
Thread-Topic: Need presentation slot in  RTGwg at IETF100
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Hi Linda,

=20

Thanks, noted.

=20

Cheers,

Jeff

=20

From: Linda Dunbar <linda.dunbar@huawei.com>
Date: Thursday, November 2, 2017 at 20:25
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "chrisbowers.ietf@gmail.com" <=
chrisbowers.ietf@gmail.com>
Cc: RTGWG <rtgwg@ietf.org>, Andrew Malis <Andrew.Malis@huawei.com>
Subject: Need presentation slot in RTGwg at IETF100

=20

Jeff and Chris,=20

=20

Can you give us 15 ~20 minutes time to present VPN Extension to Dynamic Clo=
ud DC?=20

Here are some of the reasons we propose the topic:=20

We want to bring general awareness of problems and use cases that have been=
 discussed by ONUG (Open Network User Group) community. I have been particip=
ating in ONUG (Open Network User Group) discussion for over a year. (p.s. SD=
-WAN was conceived in ONUG about 4 years ago). ONUG is enterprises (users) d=
riven community, focusing on their highly desired use cases and problems the=
y face in the digital transformation. Today, one of the hot topic in ONUG is=
 about Enterprises wanting to move workloads to cloud.

We also summarize some of the gaps of the enterprises utilizing abundant Cl=
oud DC (i.e. 3rd party DC that hosts workloads from different users) resourc=
es in the process of embracing digital transformation.=20

Even though not all use cases and problems can be directly translated to IE=
TF solvable problems, many of them are worthwhile to bring to IETF attention=
, especially from routing area.=20

We tried to put together drafts to describe the problems and gaps for enter=
prises to connect their workloads in 3rd party cloud DC, but the drafts alon=
e don=E2=80=99t have the original use cases (voted by enterprises participating in=
 ONUG), or may not stimulate in-depth discussion. =20

https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-problem-s=
tatement-01.txt

https://www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-gap-analy=
sis-00.txt

=20

Linda


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F72"><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'font-size:14.0p=
t'>Hi Linda,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:=
14.0pt'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-siz=
e:14.0pt'>Thanks, noted.<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-size:14.0pt'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><spa=
n style=3D'font-size:10.5pt;color:black'>Cheers,<o:p></o:p></span></p></div><p=
 class=3DMsoNormal><span style=3D'font-size:10.5pt;color:black'>Jeff</span><span=
 style=3D'font-size:14.0pt'><o:p></o:p></span></p><p class=3DMsoNormal><span sty=
le=3D'font-size:14.0pt'><o:p>&nbsp;</o:p></span></p><div style=3D'border:none;bo=
rder-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal s=
tyle=3D'margin-left:.5in'><b><span style=3D'font-size:12.0pt;color:black'>From: =
</span></b><span style=3D'font-size:12.0pt;color:black'>Linda Dunbar &lt;linda=
.dunbar@huawei.com&gt;<br><b>Date: </b>Thursday, November 2, 2017 at 20:25<b=
r><b>To: </b>Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt;, &quot;chrisbower=
s.ietf@gmail.com&quot; &lt;chrisbowers.ietf@gmail.com&gt;<br><b>Cc: </b>RTGW=
G &lt;rtgwg@ietf.org&gt;, Andrew Malis &lt;Andrew.Malis@huawei.com&gt;<br><b=
>Subject: </b>Need presentation slot in RTGwg at IETF100<o:p></o:p></span></=
p></div><div><p class=3DMsoNormal style=3D'margin-left:.5in'><o:p>&nbsp;</o:p></=
p></div><p class=3DMsoNormal style=3D'margin-left:.5in'>Jeff and Chris, <o:p></o=
:p></p><p class=3DMsoNormal style=3D'margin-left:.5in'>&nbsp;<o:p></o:p></p><p c=
lass=3DMsoNormal style=3D'margin-left:.5in'>Can you give us 15 ~20 minutes time =
to present VPN Extension to Dynamic Cloud DC? <o:p></o:p></p><p class=3DMsoNor=
mal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5=
in'>Here are some of the reasons we propose the topic:&nbsp;<o:p></o:p></p><=
p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;=
margin-left:.5in'>We want to bring general awareness of problems and use cas=
es that have been discussed by ONUG (Open Network User Group) community. I h=
ave been participating in ONUG (Open Network User Group) discussion for over=
 a year. (p.s. SD-WAN was conceived in ONUG about 4 years ago). ONUG is ente=
rprises (users) driven community, focusing on their highly desired use cases=
 and problems they face in the digital transformation. Today, one of the hot=
 topic in ONUG is about Enterprises wanting to move workloads to cloud.<o:p>=
</o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-botto=
m-alt:auto;margin-left:.5in'>We also summarize some of the gaps of the enter=
prises utilizing abundant Cloud DC (i.e. 3rd party DC that hosts workloads f=
rom different users) resources in the process of embracing digital transform=
ation. <o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-=
margin-bottom-alt:auto;margin-left:.5in'>Even though not all use cases and p=
roblems can be directly translated to IETF solvable problems, many of them a=
re worthwhile to bring to IETF attention, especially from routing area. <o:p=
></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bott=
om-alt:auto;margin-left:.5in'>We tried to put together drafts to describe th=
e problems and gaps for enterprises to connect their workloads in 3rd party =
cloud DC, but the drafts alone don=E2=80=99t have the original use cases (voted by=
 enterprises participating in ONUG), or may not stimulate in-depth discussio=
n. &nbsp;<o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;ms=
o-margin-bottom-alt:auto;margin-left:.5in'><a href=3D"https://www.ietf.org/int=
ernet-drafts/draft-dm-vpn-ext-to-cloud-dc-problem-statement-01.txt">https://=
www.ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-problem-statement-=
01.txt</a><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto;margin-left:.5in'><a href=3D"https://www.ietf.org/in=
ternet-drafts/draft-dm-vpn-ext-to-cloud-dc-gap-analysis-00.txt">https://www.=
ietf.org/internet-drafts/draft-dm-vpn-ext-to-cloud-dc-gap-analysis-00.txt</a=
><o:p></o:p></p><p class=3DMsoNormal style=3D'margin-left:.5in'>&nbsp;<o:p></o:p=
></p><p class=3DMsoNormal style=3D'margin-left:.5in'>Linda<o:p></o:p></p></div><=
/body></html>

--B_3592508289_1488176413--



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From: "dingxiaojian (A)" <dingxiaojian1@huawei.com>
To: "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: New Version Notification for draft-ding-netmod-arp-yang-model-00.txt
Thread-Topic: New Version Notification for draft-ding-netmod-arp-yang-model-00.txt
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Hi rtgwg,

We've submitted a new draft for ARP YANG module. This module defined in thi=
s document has common properties that need to be configured. It provides fr=
eedom for service providers to adapt this data model to different product i=
mplementations.
Please have a look and provide comments on the list.


Best Regards,
Xiaojian


A new version of I-D, draft-ding-netmod-arp-yang-model-00.txt
has been successfully submitted by Xiaojian Ding and posted to the IETF rep=
ository.

Name:		draft-ding-netmod-arp-yang-model
Revision:	00
Title:		YANG Data Model for ARP=20
Document date:	2017-10-26
Group:		Individual Submission
Pages:		16
URL:            https://www.ietf.org/internet-drafts/draft-ding-netmod-arp-=
yang-model-00.txt
Status:         https://datatracker.ietf.org/doc/draft-ding-netmod-arp-yang=
-model/
Htmlized:       https://tools.ietf.org/html/draft-ding-netmod-arp-yang-mode=
l-00
Htmlized:       https://datatracker.ietf.org/doc/html/draft-ding-netmod-arp=
-yang-model-00


Abstract:
   This document defines a YANG data model to describe Address
   Resolution Protocol (ARP) configurations.  It is intended this model
   be used by service providers who manipulate devices from different
   vendors in a standard way.

                                                                           =
      =20


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

The IETF Secretariat

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


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Subject: RTGWG presentation slot requests in Singapore - final agenda publsihed
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
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Dear RTGWG,

The agenda has been published at https://datatracker.ietf.org/meeting/100/materials/agenda-100-rtgwg/
 
If you have requested agenda time and don't see yourself there, or if you need to make a correction, please let the chairs know.
Please make sure you send us the slides on time!

RTGWG will be meeting: 
Monday, November 13, 2017, 9:30-12:00 in Canning &
Thursday, November 16, 2017 13:30-15:30 in Canning

We are still looking for volunteers to take notes and jabber.
 
See you in Singapore,
Jeff and Chris  





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From: Yingzhen Qu <yingzhen.qu@huawei.com>
To: "draft-ietf-rtgwg-lne-model@ietf.org" <draft-ietf-rtgwg-lne-model@ietf.org>
CC: RTGWG <rtgwg@ietf.org>
Subject: shepherd review of draft-ietf-rtgwg-lne-model-04
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Hi authors,

Please see attached shepherd write-up for draft-ietf-rtgwg-lne-model-04. Is=
 there any known implementation of the draft? I will update it in the write=
-up.

Also attached a word version of draft-ietf-rtgwg-lne-model-04 with editoria=
l comments.

One general comment: the examples in Appendix B need to be updated with NMD=
A compliance.

Thanks,
Yingzhen

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<p class=3D"MsoNormal">Hi authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please see attached shepherd write-up for <span lang=
=3D"EN">draft-ietf-rtgwg-lne-model-04. Is there any known implementation of=
 the draft? I will update it in the write-up.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Also attached a word version of dr=
aft-ietf-rtgwg-lne-model-04 with editorial comments.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">One general comment: the examples =
in Appendix B need to be updated with NMDA compliance.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Yingzhen</span><o:p></o:p></p>
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From: Dean Bogdanovic <ivandean@gmail.com>
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Subject: Re: shepherd review of draft-ietf-rtgwg-lne-model-04
Date: Mon, 6 Nov 2017 17:38:37 -0500
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To: Yingzhen Qu <yingzhen.qu@huawei.com>
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Yes,

There is. Volta Networks has implemented it

Dean

> On Nov 6, 2017, at 5:32 PM, Yingzhen Qu <yingzhen.qu@huawei.com> =
wrote:
>=20
> Hi authors,
> =20
> Please see attached shepherd write-up for =
draft-ietf-rtgwg-lne-model-04. Is there any known implementation of the =
draft? I will update it in the write-up.
> =20
> Also attached a word version of draft-ietf-rtgwg-lne-model-04 with =
editorial comments.
> =20
> One general comment: the examples in Appendix B need to be updated =
with NMDA compliance.
> =20
> Thanks,
> Yingzhen
> <lne_yang_shepherd.docx><draft-ietf-rtgwg-lne-model-04.docx>


--Apple-Mail=_AD7CD18B-DCB0-4379-81E9-BEF0E76AAFC0
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Yes,<div class=3D""><br class=3D""></div><div class=3D"">There =
is. Volta Networks has implemented it</div><div class=3D""><br =
class=3D""></div><div class=3D"">Dean</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Nov 6, 2017, at 5:32 PM, Yingzhen Qu &lt;<a =
href=3D"mailto:yingzhen.qu@huawei.com" =
class=3D"">yingzhen.qu@huawei.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Hi authors,<o:p class=3D""></o:p></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Please see attached shepherd write-up for<span =
class=3D"Apple-converted-space">&nbsp;</span><span lang=3D"EN" =
class=3D"">draft-ietf-rtgwg-lne-model-04. Is there any known =
implementation of the draft? I will update it in the write-up.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN" class=3D"">Also =
attached a word version of draft-ietf-rtgwg-lne-model-04 with editorial =
comments.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN" class=3D"">One general comment: the =
examples in Appendix B need to be updated with NMDA compliance.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN" class=3D"">Thanks,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN" class=3D"">Yingzhen</span><o:p =
class=3D""></o:p></div></div><span =
id=3D"cid:C4F114DB-98D8-48A0-B5E4-2B5D4303A03A@hsd1.ma.comcast.net">&lt;ln=
e_yang_shepherd.docx&gt;</span><span =
id=3D"cid:9F78DCEA-4230-4CAE-AF63-4D83B441F602@hsd1.ma.comcast.net">&lt;dr=
aft-ietf-rtgwg-lne-model-04.docx&gt;</span></div></blockquote></div><br =
class=3D""></div></body></html>=

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From: Yingzhen Qu <yingzhen.qu@huawei.com>
To: Dean Bogdanovic <ivandean@gmail.com>
CC: "draft-ietf-rtgwg-lne-model@ietf.org" <draft-ietf-rtgwg-lne-model@ietf.org>, RTGWG <rtgwg@ietf.org>
Subject: RE: shepherd review of draft-ietf-rtgwg-lne-model-04
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Hi Dean,

Thanks for the info. I suppose it's version-04 that was implemented.

Thanks,
Yingzhen

From: Dean Bogdanovic [mailto:ivandean@gmail.com]
Sent: Monday, November 06, 2017 2:39 PM
To: Yingzhen Qu <yingzhen.qu@huawei.com>
Cc: draft-ietf-rtgwg-lne-model@ietf.org; RTGWG <rtgwg@ietf.org>
Subject: Re: shepherd review of draft-ietf-rtgwg-lne-model-04

Yes,

There is. Volta Networks has implemented it

Dean

On Nov 6, 2017, at 5:32 PM, Yingzhen Qu <yingzhen.qu@huawei.com<mailto:ying=
zhen.qu@huawei.com>> wrote:

Hi authors,

Please see attached shepherd write-up for draft-ietf-rtgwg-lne-model-04. Is=
 there any known implementation of the draft? I will update it in the write=
-up.

Also attached a word version of draft-ietf-rtgwg-lne-model-04 with editoria=
l comments.

One general comment: the examples in Appendix B need to be updated with NMD=
A compliance.

Thanks,
Yingzhen
<lne_yang_shepherd.docx><draft-ietf-rtgwg-lne-model-04.docx>


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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Hi Dean,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Thanks for the info. I suppose it&#82=
17;s version-04 that was implemented.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Yingzhen<o:p></o:p></span></p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbs=
p;</o:p></span></a></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Dean Bogdanovic [mailto:ivande=
an@gmail.com]
<br>
<b>Sent:</b> Monday, November 06, 2017 2:39 PM<br>
<b>To:</b> Yingzhen Qu &lt;yingzhen.qu@huawei.com&gt;<br>
<b>Cc:</b> draft-ietf-rtgwg-lne-model@ietf.org; RTGWG &lt;rtgwg@ietf.org&gt=
;<br>
<b>Subject:</b> Re: shepherd review of draft-ietf-rtgwg-lne-model-04<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Yes,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">There is. Volta Networks has implemented it<o:p></o:=
p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Dean<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Nov 6, 2017, at 5:32 PM, Yingzhen Qu &lt;<a href=
=3D"mailto:yingzhen.qu@huawei.com">yingzhen.qu@huawei.com</a>&gt; wrote:<o:=
p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Hi authors,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Please see attached shepherd write-up for<span clas=
s=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN" style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">draft-ietf-rtg=
wg-lne-model-04.
 Is there any known implementation of the draft? I will update it in the wr=
ite-up.</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&nbsp;</span><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">Also attached a word version of draft-i=
etf-rtgwg-lne-model-04 with editorial comments.</span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&nbsp;</span><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">One general comment: the examples in Ap=
pendix B need to be updated with NMDA compliance.</span><span style=3D"font=
-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&nbsp;</span><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">Thanks,</span><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">Yingzhen</span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal">&lt;lne_yang_shepherd.docx&gt;&lt;draft-ietf-rtgwg-l=
ne-model-04.docx&gt;<o:p></o:p></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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Date: Tue, 07 Nov 2017 10:58:14 -0800
Subject: Re: RTGWG presentation slot requests in Singapore - final agenda publsihed
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "dingxiaojian (A)" <dingxiaojian1@huawei.com>, RTGWG <rtgwg@ietf.org>
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Thread-Topic: RTGWG presentation slot requests in Singapore - final agenda publsihed
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Hi Xiaojian,

Thanks, noted.

Cheers,
Jeff

-----Original Message-----
From: "dingxiaojian (A)" <dingxiaojian1@huawei.com>
Date: Monday, November 6, 2017 at 18:39
To: Jeff Tantsura <jefftant.ietf@gmail.com>, RTGWG <rtgwg@ietf.org>
Cc: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>
Subject: Re: RTGWG presentation slot requests in Singapore - final agenda p=
ublsihed

    Dear Jeff and chairs,
   =20
    Can I request a time slot for the latest draft
   =20
    draft-ding-netmod-arp-yang-model-00.txt
        URL:         https://www.ietf.org/internet-drafts/draft-ding-netmod=
-arp-yang-model-00.txt
        Status:         https://datatracker.ietf.org/doc/draft-ding-netmod-=
arp-yang-model/
        Htmlized:       https://tools.ietf.org/html/draft-ding-netmod-arp-y=
ang-model-00
        Htmlized:       https://datatracker.ietf.org/doc/html/draft-ding-ne=
tmod-arp-yang-model-00
   =20
   =20
    Presenter: Xiaojian Ding  Time: 10 min
   =20
    Best regards,
    Xiaojian
   =20
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    =E5=8F=91=E4=BB=B6=E4=BA=BA: rtgwg [mailto:rtgwg-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Jeff Tantsura
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2017=E5=B9=B411=E6=9C=886=E6=97=A5 13:01
    =E6=94=B6=E4=BB=B6=E4=BA=BA: RTGWG <rtgwg@ietf.org>
    =E6=8A=84=E9=80=81: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>
    =E4=B8=BB=E9=A2=98: RTGWG presentation slot requests in Singapore - final agenda pu=
blsihed
   =20
    Dear RTGWG,
   =20
    The agenda has been published at https://datatracker.ietf.org/meeting/1=
00/materials/agenda-100-rtgwg/
    =20
    If you have requested agenda time and don't see yourself there, or if y=
ou need to make a correction, please let the chairs know.
    Please make sure you send us the slides on time!
   =20
    RTGWG will be meeting:=20
    Monday, November 13, 2017, 9:30-12:00 in Canning & Thursday, November 1=
6, 2017 13:30-15:30 in Canning
   =20
    We are still looking for volunteers to take notes and jabber.
    =20
    See you in Singapore,
    Jeff and Chris =20
   =20
   =20
   =20
   =20
    _______________________________________________
    rtgwg mailing list
    rtgwg@ietf.org
    https://www.ietf.org/mailman/listinfo/rtgwg
   =20



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--_005_48C7D61C1B364260A24C8AC706FCAB9Bhuaweicom_--


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Subject: Re: DC Routing requirements draft
From: Yi Yang <yyietf@gmail.com>
In-Reply-To: <5C6D0957-6C0B-453C-8547-6ED9347D3D8E@gmail.com>
Date: Fri, 10 Nov 2017 16:25:20 -0500
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To: Jeff Tantsura <jefftant.ietf@gmail.com>
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Hi Jeff,

This is probably obvious, but it might be worth to clarify =E2=80=94 the =
convergence time requirement is for a single event, right?

Yi

> On Oct 30, 2017, at 7:39 PM, Jeff Tantsura <jefftant.ietf@gmail.com> =
wrote:
>=20
> All,
>=20
> We have just published DC Routing requirements draft =
(draft-dt-rtgwg-dcrouting-requirements) that is going to be presented at =
the upcoming BoF in Singapore.
> Please note that EDCO group =
(draft-elkins-routing-brickmortar-topology) input was not included and =
will have a separate track.
>=20
> Your comments and suggestions are very welcome.
>=20
> draft co-authors
>=20
>=20
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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Date: Sat, 11 Nov 2017 09:47:20 +0800
Subject: Re: DC Routing requirements draft
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Yi Yang <yyietf@gmail.com>
CC: Dcrouting <dcrouting-bounces@ietf.org>, RTGWG <rtgwg@ietf.org>
Message-ID: <62463820-6C61-4E61-8BDC-917D045815CB@gmail.com>
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Hi Yi,

yes, correct.

Cheers,
Jeff

-----Original Message-----
From: Yi Yang <yyietf@gmail.com>
Date: Saturday, November 11, 2017 at 05:25
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Dcrouting <dcrouting-bounces@ietf.org>, RTGWG <rtgwg@ietf.org>
Subject: Re: DC Routing requirements draft

    Hi Jeff,
   =20
    This is probably obvious, but it might be worth to clarify =E2=80=94 the conv=
ergence time requirement is for a single event, right?
   =20
    Yi
   =20
    > On Oct 30, 2017, at 7:39 PM, Jeff Tantsura <jefftant.ietf@gmail.com> =
wrote:
    >=20
    > All,
    >=20
    > We have just published DC Routing requirements draft (draft-dt-rtgwg-=
dcrouting-requirements) that is going to be presented at the upcoming BoF in=
 Singapore.
    > Please note that EDCO group (draft-elkins-routing-brickmortar-topolog=
y) input was not included and will have a separate track.
    >=20
    > Your comments and suggestions are very welcome.
    >=20
    > draft co-authors
    >=20
    >=20
    > _______________________________________________
    > rtgwg mailing list
    > rtgwg@ietf.org
    > https://www.ietf.org/mailman/listinfo/rtgwg
   =20
   =20



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Subject: Re: RTGWG WGLC draft-ietf-rtgwg-ni-model
From: Dean Bogdanovic <ivandean@gmail.com>
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As a co-author, I am not aware of any relevant IPR

 Dean
>=20
> -----Original Message-----
> From: rtgwg [mailto:rtgwg-bounces@ietf.org] On Behalf Of Jeff Tantsura
> Sent: Tuesday, October 24, 2017 5:17 AM
> To: RTGWG <rtgwg@ietf.org>
> Cc: Rtg-dt-yang-arch <rtg-dt-yang-arch-bounces@ietf.org>; =
'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>
> Subject: RTGWG WGLC draft-ietf-rtgwg-ni-model
>=20
> Dear RTGWG,
>=20
> The authors have requested the RTGWG to last call =
draft-ietf-rtgwg-ni-model.
>=20
> The interdependencies related to draft-ietf-netmod-schema-mount have =
been addressed.
> There was consensus that document is ready for the last call during =
the last IETF meeting and the authors have addressed all the comments =
from Directorate QA review and YANGDOCTORS.
> Please indicate support or no-support by November 6, 2017.
>=20
> IPR:
> If you are listed as a document author or contributor, please respond =
to this email of whether or not you are aware of any relevant IPR.=20
> The response needs to be sent to the RTGWG mailing list.
> The document will not advance to the next stage until a response has =
been received from each author and each individual that has contributed =
to the document.
>=20
> Thanks,
> Jeff & Chris
>=20
>=20
>=20
>=20
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> =
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Subject: Re: RTGWG WGLC draft-ietf-rtgwg-lne-model
From: Dean Bogdanovic <ivandean@gmail.com>
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Date: Sun, 12 Nov 2017 17:09:54 +0800
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 As a co-author, I am not aware of any relevant IPR

Dean
>=20
> -----Original Message-----
> From: Jeff Tantsura <jefftant.ietf@gmail.com>
> Date: Monday, October 23, 2017 at 14:17
> To: RTGWG <rtgwg@ietf.org>
> Cc: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>, Benoit Claise =
<bclaise@cisco.com>, Rtg-dt-yang-arch =
<rtg-dt-yang-arch-bounces@ietf.org>
> Subject: RTGWG WGLC draft-ietf-rtgwg-lne-model
>=20
>    Dear RTGWG,
>=20
>    The authors have requested the RTGWG to last call =
draft-ietf-rtgwg-lne-model
>=20
>    The interdependencies related to draft-ietf-netmod-schema-mount =
have been addressed.
>    There was consensus that document is ready for the last call during =
the last IETF meeting=20
>    and the authors have addressed all the comments from Directorate QA =
review and YANGDOCTORS.
>    Please indicate support or no-support by November 6, 2017.
>=20
>    IPR:
>    If you are listed as a document author or contributor, please =
respond to this=20
>    email of whether or not you are aware of any relevant IPR.=20
>    The response needs to be sent to the RTGWG mailing list.
>    The document will not advance to the next stage until a response =
has been=20
>    received from each author and each individual that has contributed =
to the document.
>=20
>    Thanks,
>    Jeff & Chris
>=20
>=20
>=20
>=20
>=20
>=20


From nobody Sun Nov 12 17:44:52 2017
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Subject: I-D Action: draft-ietf-rtgwg-uloop-delay-09.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 Routing Area Working Group WG of the IETF.

        Title           : Micro-loop prevention by introducing a local convergence delay
        Authors         : Stephane Litkowski
                          Bruno Decraene
                          Clarence Filsfils
                          Pierre Francois
	Filename        : draft-ietf-rtgwg-uloop-delay-09.txt
	Pages           : 27
	Date            : 2017-11-12

Abstract:
   This document describes a mechanism for link-state routing protocols
   to prevent local transient forwarding loops in case of link failure.
   This mechanism proposes a two-step convergence by introducing a delay
   between the convergence of the node adjacent to the topology change
   and the network wide convergence.

   As this mechanism delays the IGP convergence it may only be used for
   planned maintenance or when fast reroute protects the traffic between
   the link failure time and the IGP convergence.

   The proposed mechanism is limited to the link down event in order to
   keep the mechanism simple.

   Simulations using real network topologies have been performed and
   show that local loops are a significant portion (>50%) of the total
   forwarding loops.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-uloop-delay/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-uloop-delay-09
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-uloop-delay-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-uloop-delay-09


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

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


From nobody Sun Nov 12 17:47:39 2017
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To: Alvaro Retana <aretana.ietf@gmail.com>
CC: The IESG <iesg@ietf.org>, "draft-ietf-rtgwg-uloop-delay@ietf.org" <draft-ietf-rtgwg-uloop-delay@ietf.org>, "rtgwg-chairs@ietf.org" <rtgwg-chairs@ietf.org>, "chrisbowers.ietf@gmail.com" <chrisbowers.ietf@gmail.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "Acee Lindem (acee) (acee@cisco.com)" <acee@cisco.com>
Subject: RE: Alvaro Retana's Discuss on draft-ietf-rtgwg-uloop-delay-07: (with DISCUSS and COMMENT)
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Date: Mon, 13 Nov 2017 15:08:29 +0800
Subject: Agenda for Thursday, November 16
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
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Dear RTGWG,

There have been some changes to the agenda, please use the latest - https://datatracker.ietf.org/doc/agenda-100-rtgwg/

Thanks!
Jeff and Chris



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Date: Thu, 16 Nov 2017 11:15:04 +0800
Subject: draft-arkko-arch-virtualization presentation 
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
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Dear RTGWG,

The draft for the IETF technologies supporting virtualization and slicing s=
lot in today=E2=80=99s meeting has been published and slides uploaded.

Cheers,
Jeff



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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 16 Nov 2017 14:52:31 +0800
Message-ID: <CA+RyBmX7zgp3WgeMpov2=vbThWwDXs_XJJiGeyiaSKgrPpo0RA@mail.gmail.com>
Subject: Scope of strict SLA in network slicing
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Dear All,
I'd like to stress what I've said at the mike. Two of three network slicing
scenarios, enhanced mobile broadband and massive IoT, that have been
defined by 3GPP do not set forth too strict latency/jitter/packet loss
constraints. But netslices to support ultra-reliable and low latency
communications (URLLC) are expected to have very stringent
latency/jitter/packet loss constraints e2e. But, in my opinion, there's no
requirement that URLLC slices must share physical resources. One of
solutions may use, for example, FlexE to deliver CBR guaranteed services.

Regards,
Greg

--001a11401f6a791145055e141039
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<div dir=3D"ltr">Dear All,<div>I&#39;d like to stress what I&#39;ve said at=
 the mike. Two of three network slicing scenarios, enhanced mobile broadban=
d and massive IoT, that have been defined by 3GPP do not set forth too stri=
ct latency/jitter/packet loss constraints. But netslices to support ultra-r=
eliable and low latency communications (URLLC) are expected to have very st=
ringent latency/jitter/packet loss constraints e2e. But, in my opinion, the=
re&#39;s no requirement that URLLC slices must share physical resources. On=
e of solutions may use, for example, FlexE to deliver CBR guaranteed servic=
es.</div><div><br></div><div>Regards,</div><div>Greg</div></div>

--001a11401f6a791145055e141039--


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Following up on my comment during the rtgwg session about current related w=
ork in the DMM WG for models applying in between
mobile gateway control/data plane, please find a pointer to the associated =
draft below.

https://datatracker.ietf.org/doc/draft-ietf-dmm-fpc-cpdp/

marco

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Following up on my comment duri=
ng the rtgwg session about current related work in the DMM WG for models ap=
plying in between<br>
mobile gateway control/data plane, please find a pointer to the associated =
draft below.<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/doc/draft-ietf-dmm-fpc-cpdp/">https://datatracker.ietf.org/doc/dra=
ft-ietf-dmm-fpc-cpdp/</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">marco <o:p></o:p></span></p>
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--_000_69756203DDDDE64E987BC4F70B71A26DD5A68A53PALLENEofficehd_--


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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: Greg Mirsky <gregimirsky@gmail.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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From: wangzitao <wangzitao@huawei.com>
To: Marco Liebsch <Marco.Liebsch@neclab.eu>, "rtgwg@ietf.org" <rtgwg@ietf.org>
CC: 'Ariel Gu' <gurong@chinamobile.com>
Subject: RE: BNG C/U plane separation info models
Thread-Topic: BNG C/U plane separation info models
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Date: Thu, 16 Nov 2017 09:11:21 +0000
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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi</span><span lang=3D"EN-US" s=
tyle=3D"mso-fareast-language:ZH-CN"> M</span><span lang=3D"EN-US">arco</spa=
n><span lang=3D"EN-US" style=3D"mso-fareast-language:ZH-CN">,</span><span l=
ang=3D"EN-US"><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">I reviewed this document, it=
 is a really good work. For the FPC agent, it seems that take charge of the=
 configuration of user planes (data planes).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">And in CU separation BNG, th=
ere are three interfaces, as shown below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:Z=
H-CN"><img width=3D"277" height=3D"195" id=3D"_x56fe__x7247__x0020_1" src=
=3D"cid:image001.png@01D35EFD.EC8B3800" alt=3D"=B2=B6=BB=F1"></span><span l=
ang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">For our document, it focus o=
n the control interface. The CU separation BNG information model presents t=
he tables which are dynamic generated by the centralized Control-Plane and =
will be transported via some control
 protocol. It not take charge of configuration.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Since, based on previous res=
earch and discuss, if we transport these tables via the netconf ( or anothe=
r configuration protocols), it cannot satisfy the high performance of BNG r=
equired.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText" align=3D"right" style=3D"text-align:right"><span =
lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">And also we will analyze the=
 FPC, and if it can satisfy the requirements of BNG</span><span lang=3D"EN-=
US" style=3D"font-family:&quot;Courier New&quot;">=A1=AF</span><span lang=
=3D"EN-US">s configuration, maybe we can reused it to configure
 the UP devices.<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">Best Regards!<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">-Michael<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"> rtgwg [mailto:rtgwg-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">Marco Liebsch<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"> 2017=
</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">11</span>=D4=
=C2<span lang=3D"EN-US">16</span>=C8=D5<span lang=3D"EN-US">
 15:39<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> rtgwg@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> BNG C/U plane separation info models<o:p></o:p></span></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">Following up on my comment duri=
ng the rtgwg session about current related work in the DMM WG for models ap=
plying in between<br>
mobile gateway control/data plane, please find a pointer to the associated =
draft below.<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/doc/draft-ietf-dmm-fpc-cpdp/">https://datatracker.ietf.org/doc/dra=
ft-ietf-dmm-fpc-cpdp/</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">marco <o:p></o:p></span></p>
</div>
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From nobody Mon Nov 20 12:46:11 2017
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Subject: I-D Action: draft-ietf-rtgwg-bgp-pic-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Routing Area Working Group WG of the IETF.

        Title           : BGP Prefix Independent Convergence
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Prodosh Mohapatra
	Filename        : draft-ietf-rtgwg-bgp-pic-06.txt
	Pages           : 30
	Date            : 2017-11-20

Abstract:
In the network comprising thousands of iBGP peers exchanging millions
of routes, many routes are reachable via more than one next-hop.
Given the large scaling targets, it is desirable to restore traffic
after failure in a time period that does not depend on the number of
BGP prefixes. In this document we proposed an architecture by which
traffic can be re-routed to ECMP or pre-calculated backup paths in a
timeframe that does not depend on the number of BGP prefixes. The
objective is achieved through organizing the forwarding data
structures in a hierarchical manner and sharing forwarding elements
among the maximum possible number of routes. The proposed technique
achieves prefix independent convergence while ensuring incremental
deployment, complete automation, and zero management and provisioning
effort. It is noteworthy to mention that the benefits of BGP-PIC are
hinged on the existence of more than one path whether as ECMP or
primary-backup.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-bgp-pic/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-bgp-pic-06
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-bgp-pic-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-bgp-pic-06


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

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


From nobody Wed Nov 22 01:27:46 2017
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Wed, 22 Nov 2017 14:57:42 +0530
Message-ID: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com>
Subject: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
protecting SR policy midpoints against node failure for the case where the
active segment is the prefix or adjacency segment of a neighbor.

I believe the steps described in the procedure is applicable only for a
node steering packets into the SR policy. This could be an ingress PE
steering IP packets into a SR-TE tunnel or an intermediate node steering
labeled packets received with a BSID into a SR-TE tunnel identified by that
BSID.

A transit node that has no idea about the SR policy itself is not expected
to perform the procedure described in that section.

Is my understanding correct?

Regards,
Muthu

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Section 5.3 of=C2=A0draft-bashandy-rtgw=
g-segment-routing-ti-lfa describes protecting SR policy midpoints against n=
ode failure for the case where the active segment is the prefix or adjacenc=
y segment of a neighbor.</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gm=
ail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">I believe the steps described in the procedure is applicable only for a =
node steering packets into the SR policy. This could be an ingress PE steer=
ing IP packets into a SR-TE tunnel or an intermediate node steering labeled=
 packets received with a BSID into a SR-TE tunnel identified by that BSID.<=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">A transit node that ha=
s no idea about the SR policy itself is not expected to perform the procedu=
re described in that section.</div><div class=3D"gmail_default" style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">Is my understanding correct?</div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><di=
v class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;f=
ont-size:small">Regards,</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small">Muthu</div></div>

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Date: Wed, 22 Nov 2017 14:52:43 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
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To: "muthu.arul@gmail.com" <muthu.arul@gmail.com>,  "rtgwg@ietf.org" <rtgwg@ietf.org>
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Muthu and all,I do not see how the draft in quesrion us related to "SR Poli=
cy".
>From my POV its scope is a SR LSP comprised of multiple Node SIDs within a =
single IGP domain, and it provides local fast protection against failure of=
 a node that terminates one of the segments comprising this LSP. Pritection=
 action is performed by the penultimate node.
My 2c.

Sent from Yahoo Mail on Android=20
=20
  On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal<muthu.arul@gmail.c=
om> wrote:   Section 5.3 of=C2=A0draft-bashandy-rtgwg-segment-routing-ti-lf=
a describes protecting SR policy midpoints against node failure for the cas=
e where the active segment is the prefix or adjacency segment of a neighbor=
.
I believe the steps described in the procedure is applicable only for a nod=
e steering packets into the SR policy. This could be an ingress PE steering=
 IP packets into a SR-TE tunnel or an intermediate node steering labeled pa=
ckets received with a BSID into a SR-TE tunnel identified by that BSID.
A transit node that has no idea about the SR policy itself is not expected =
to perform the procedure described in that section.
Is my understanding correct?
Regards,Muthu_______________________________________________
rtgwg mailing list
rtgwg@ietf.org
https://www.ietf.org/mailman/listinfo/rtgwg
 =20

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Muthu and all,<div id=3D"yMail_cursorElementTracker_1511362077836">I do not=
 see how the draft in quesrion us related to "SR Policy".</div><div id=3D"y=
Mail_cursorElementTracker_1511362111884"><br></div><div id=3D"yMail_cursorE=
lementTracker_1511362112091">From my POV its scope is a SR LSP comprised of=
 multiple Node SIDs within a single IGP domain, and it provides local fast =
protection against failure of a node that terminates one of the segments co=
mprising this LSP. Pritection action is performed by the penultimate node.<=
/div><div id=3D"yMail_cursorElementTracker_1511362349834"><br></div><div id=
=3D"yMail_cursorElementTracker_1511362350059">My 2c.<br><br><div id=3D"ymai=
l_android_signature"><a href=3D"https://overview.mail.yahoo.com/mobile/?.sr=
c=3DAndroid">Sent from Yahoo Mail on Android</a></div> <br> <blockquote sty=
le=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto, sans-serif; c=
olor:#6D00F6;"> <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal=
</div><div>&lt;muthu.arul@gmail.com&gt; wrote:</div> </div> <div style=3D"p=
adding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"=
> <div id=3D"yiv2858571294"><div dir=3D"ltr"><div class=3D"yiv2858571294gma=
il_default" style=3D"font-family:arial, helvetica, sans-serif;font-size:sma=
ll;">Section 5.3 of&nbsp;draft-bashandy-rtgwg-segment-routing-ti-lfa descri=
bes protecting SR policy midpoints against node failure for the case where =
the active segment is the prefix or adjacency segment of a neighbor.</div><=
div class=3D"yiv2858571294gmail_default" style=3D"font-family:arial, helvet=
ica, sans-serif;font-size:small;"><br></div><div class=3D"yiv2858571294gmai=
l_default" style=3D"font-family:arial, helvetica, sans-serif;font-size:smal=
l;">I believe the steps described in the procedure is applicable only for a=
 node steering packets into the SR policy. This could be an ingress PE stee=
ring IP packets into a SR-TE tunnel or an intermediate node steering labele=
d packets received with a BSID into a SR-TE tunnel identified by that BSID.=
</div><div class=3D"yiv2858571294gmail_default" style=3D"font-family:arial,=
 helvetica, sans-serif;font-size:small;"><br></div><div class=3D"yiv2858571=
294gmail_default" style=3D"font-family:arial, helvetica, sans-serif;font-si=
ze:small;">A transit node that has no idea about the SR policy itself is no=
t expected to perform the procedure described in that section.</div><div cl=
ass=3D"yiv2858571294gmail_default" style=3D"font-family:arial, helvetica, s=
ans-serif;font-size:small;"><br></div><div class=3D"yiv2858571294gmail_defa=
ult" style=3D"font-family:arial, helvetica, sans-serif;font-size:small;">Is=
 my understanding correct?</div><div class=3D"yiv2858571294gmail_default" s=
tyle=3D"font-family:arial, helvetica, sans-serif;font-size:small;"><br></di=
v><div class=3D"yiv2858571294gmail_default" style=3D"font-family:arial, hel=
vetica, sans-serif;font-size:small;">Regards,</div><div class=3D"yiv2858571=
294gmail_default" style=3D"font-family:arial, helvetica, sans-serif;font-si=
ze:small;">Muthu</div></div></div>_________________________________________=
______<br>rtgwg mailing list<br><a ymailto=3D"mailto:rtgwg@ietf.org" href=
=3D"mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br><a href=3D"https://www.iet=
f.org/mailman/listinfo/rtgwg" target=3D"_blank">https://www.ietf.org/mailma=
n/listinfo/rtgwg</a><br> </div> </blockquote></div>
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Thu, 23 Nov 2017 18:34:01 +0530
Message-ID: <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "sasha@axerra.com" <sasha@axerra.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
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My understanding is that draft wants to provide a solution for the problem
where the active segment is a prefix/adjacency segment of the neighbor and
the neighbor fails. A solution to this is possible only at a node that is
enforcing the SR policy (consisting of the segment list). For a transit
node, its data plane would have to peek into the label stack and determine
the type of the segment/label following the active segment and act
accordingly, which is not inline with the SR architecture which requires SR
to work 'as is' on traditional MPLS data plane

=E2=80=8BMuthu=E2=80=8B

On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein <vinesasha@yahoo.com>
wrote:

> Muthu and all,
> I do not see how the draft in quesrion us related to "SR Policy".
>
> From my POV its scope is a SR LSP comprised of multiple Node SIDs within =
a
> single IGP domain, and it provides local fast protection against failure =
of
> a node that terminates one of the segments comprising this LSP. Pritectio=
n
> action is performed by the penultimate node.
>
> My 2c.
>
> Sent from Yahoo Mail on Android
> <https://overview.mail.yahoo.com/mobile/?.src=3DAndroid>
>
> On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
> <muthu.arul@gmail.com> wrote:
> Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
> protecting SR policy midpoints against node failure for the case where th=
e
> active segment is the prefix or adjacency segment of a neighbor.
>
> I believe the steps described in the procedure is applicable only for a
> node steering packets into the SR policy. This could be an ingress PE
> steering IP packets into a SR-TE tunnel or an intermediate node steering
> labeled packets received with a BSID into a SR-TE tunnel identified by th=
at
> BSID.
>
> A transit node that has no idea about the SR policy itself is not expecte=
d
> to perform the procedure described in that section.
>
> Is my understanding correct?
>
> Regards,
> Muthu
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg
>
>

--001a113a8d64ec1222055ea6110c
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<div dir=3D"ltr"><div class=3D"gmail_default"><div class=3D"gmail_default">=
<font face=3D"arial, helvetica, sans-serif">My understanding is that draft =
wants to provide a solution for the problem where the active segment is a p=
refix/adjacency segment of the neighbor and the neighbor fails. A solution =
to this is possible only at a node that is enforcing the SR policy (consist=
ing of the segment list).=C2=A0</font><span style=3D"font-family:arial,helv=
etica,sans-serif">For a transit node, its data plane would have to peek int=
o the label stack and determine the type of the segment/label following the=
 active segment and act accordingly, which is not inline with the SR archit=
ecture which requires SR to work &#39;as is&#39; on traditional MPLS data p=
lane</span></div><div style=3D"font-family:arial,helvetica,sans-serif;font-=
size:small"><br></div></div><div class=3D"gmail_extra"><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
=E2=80=8BMuthu=E2=80=8B</div><br><div class=3D"gmail_quote">On Wed, Nov 22,=
 2017 at 8:22 PM, Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:vinesasha@yahoo.com" target=3D"_blank">vinesasha@yahoo.com</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Muthu and al=
l,<div id=3D"gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362=
077836">I do not see how the draft in quesrion us related to &quot;SR Polic=
y&quot;.</div><div id=3D"gmail-m_-4932204748884570604yMail_cursorElementTra=
cker_1511362111884"><br></div><div id=3D"gmail-m_-4932204748884570604yMail_=
cursorElementTracker_1511362112091">From my POV its scope is a SR LSP compr=
ised of multiple Node SIDs within a single IGP domain, and it provides loca=
l fast protection against failure of a node that terminates one of the segm=
ents comprising this LSP. Pritection action is performed by the penultimate=
 node.</div><div id=3D"gmail-m_-4932204748884570604yMail_cursorElementTrack=
er_1511362349834"><br></div><div id=3D"gmail-m_-4932204748884570604yMail_cu=
rsorElementTracker_1511362350059">My 2c.<br><br><div id=3D"gmail-m_-4932204=
748884570604ymail_android_signature"><a href=3D"https://overview.mail.yahoo=
.com/mobile/?.src=3DAndroid" target=3D"_blank">Sent from Yahoo Mail on Andr=
oid</a></div> <br> <blockquote style=3D"margin:0px 0px 20px"><div><div clas=
s=3D"gmail-h5"> <div style=3D"font-family:Roboto,sans-serif;color:rgb(109,0=
,246)"> <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal</div><d=
iv>&lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul=
@gmail.com</a>&gt; wrote:</div> </div> </div></div><div style=3D"padding:10=
px 0px 0px 20px;margin:10px 0px 0px;border-left:1px solid rgb(109,0,246)"><=
div><div class=3D"gmail-h5"> <div id=3D"gmail-m_-4932204748884570604yiv2858=
571294"><div dir=3D"ltr"><div class=3D"gmail-m_-4932204748884570604yiv28585=
71294gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-si=
ze:small">Section 5.3 of=C2=A0draft-bashandy-rtgwg-<wbr>segment-routing-ti-=
lfa describes protecting SR policy midpoints against node failure for the c=
ase where the active segment is the prefix or adjacency segment of a neighb=
or.</div><div class=3D"gmail-m_-4932204748884570604yiv2858571294gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></=
div><div class=3D"gmail-m_-4932204748884570604yiv2858571294gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small">I believe t=
he steps described in the procedure is applicable only for a node steering =
packets into the SR policy. This could be an ingress PE steering IP packets=
 into a SR-TE tunnel or an intermediate node steering labeled packets recei=
ved with a BSID into a SR-TE tunnel identified by that BSID.</div><div clas=
s=3D"gmail-m_-4932204748884570604yiv2858571294gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"=
gmail-m_-4932204748884570604yiv2858571294gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:small">A transit node that has no id=
ea about the SR policy itself is not expected to perform the procedure desc=
ribed in that section.</div><div class=3D"gmail-m_-4932204748884570604yiv28=
58571294gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font=
-size:small"><br></div><div class=3D"gmail-m_-4932204748884570604yiv2858571=
294gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size=
:small">Is my understanding correct?</div><div class=3D"gmail-m_-4932204748=
884570604yiv2858571294gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><br></div><div class=3D"gmail-m_-493220474888457=
0604yiv2858571294gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small">Regards,</div><div class=3D"gmail-m_-4932204748884570=
604yiv2858571294gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small">Muthu</div></div></div></div></div>___________________=
___________<wbr>_________________<br>rtgwg mailing list<br><a href=3D"mailt=
o:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a><br><a href=3D"https:=
//www.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">https://www.ietf.o=
rg/mailman/<wbr>listinfo/rtgwg</a><br> </div> </blockquote></div></blockquo=
te></div><br></div></div>

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From: Huzhibo <huzhibo@huawei.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>
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Subject: RE: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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From: Stewart Bryant <stewart.bryant@gmail.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
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 From my reading of the draft the proposal is  only to try to find the 
conventional shortest repair path from the PLR to the node specified by ToS

I have always though that this needed a health warning, as presumably 
the SR path was calculated for a reason and FRR needs to respect that 
reason.

This is true if ToS is an node-SID, it is even more the case if the ToS 
is an adj-SID.

- Stewart


On 23/11/2017 13:04, Muthu Arul Mozhi Perumal wrote:
> My understanding is that draft wants to provide a solution for the 
> problem where the active segment is a prefix/adjacency segment of the 
> neighbor and the neighbor fails. A solution to this is possible only 
> at a node that is enforcing the SR policy (consisting of the segment 
> list). For a transit node, its data plane would have to peek into the 
> label stack and determine the type of the segment/label following the 
> active segment and act accordingly, which is not inline with the SR 
> architecture which requires SR to work 'as is' on traditional MPLS 
> data plane
>
> ​Muthu​
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein 
> <vinesasha@yahoo.com <mailto:vinesasha@yahoo.com>> wrote:
>
>     Muthu and all,
>     I do not see how the draft in quesrion us related to "SR Policy".
>
>     From my POV its scope is a SR LSP comprised of multiple Node SIDs
>     within a single IGP domain, and it provides local fast protection
>     against failure of a node that terminates one of the segments
>     comprising this LSP. Pritection action is performed by the
>     penultimate node.
>
>     My 2c.
>
>     Sent from Yahoo Mail on Android
>     <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
>         On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>         <muthu.arul@gmail.com <mailto:muthu.arul@gmail.com>> wrote:
>         Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa
>         describes protecting SR policy midpoints against node failure
>         for the case where the active segment is the prefix or
>         adjacency segment of a neighbor.
>
>         I believe the steps described in the procedure is applicable
>         only for a node steering packets into the SR policy. This
>         could be an ingress PE steering IP packets into a SR-TE tunnel
>         or an intermediate node steering labeled packets received with
>         a BSID into a SR-TE tunnel identified by that BSID.
>
>         A transit node that has no idea about the SR policy itself is
>         not expected to perform the procedure described in that section.
>
>         Is my understanding correct?
>
>         Regards,
>         Muthu
>         _______________________________________________
>         rtgwg mailing list
>         rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>         https://www.ietf.org/mailman/listinfo/rtgwg
>         <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>
>
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p><br>
    </p>
    <p>From my reading of the draft the proposal is  only to try to find
      the conventional shortest repair path from the PLR to the node
      specified by ToS<br>
    </p>
    <p>I have always though that this needed a health warning, as
      presumably the SR path was calculated for a reason and FRR needs
      to respect that reason.</p>
    <p>This is true if ToS is an node-SID, it is even more the case if
      the ToS is an adj-SID.</p>
    <p>- Stewart<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 23/11/2017 13:04, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com">
      <div dir="ltr">
        <div class="gmail_default">
          <div class="gmail_default"><font face="arial, helvetica,
              sans-serif">My understanding is that draft wants to
              provide a solution for the problem where the active
              segment is a prefix/adjacency segment of the neighbor and
              the neighbor fails. A solution to this is possible only at
              a node that is enforcing the SR policy (consisting of the
              segment list). </font><span
              style="font-family:arial,helvetica,sans-serif">For a
              transit node, its data plane would have to peek into the
              label stack and determine the type of the segment/label
              following the active segment and act accordingly, which is
              not inline with the SR architecture which requires SR to
              work 'as is' on traditional MPLS data plane</span></div>
          <div
            style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
          </div>
        </div>
        <div class="gmail_extra">
          <div class="gmail_default"
            style="font-family:arial,helvetica,sans-serif;font-size:small">​Muthu​</div>
          <br>
          <div class="gmail_quote">On Wed, Nov 22, 2017 at 8:22 PM,
            Alexander Vainshtein <span dir="ltr">&lt;<a
                href="mailto:vinesasha@yahoo.com" target="_blank"
                moz-do-not-send="true">vinesasha@yahoo.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0px 0px 0px
              0.8ex;border-left:1px solid
              rgb(204,204,204);padding-left:1ex">Muthu and all,
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362077836">I
                do not see how the draft in quesrion us related to "SR
                Policy".</div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362111884"><br>
              </div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362112091">From
                my POV its scope is a SR LSP comprised of multiple Node
                SIDs within a single IGP domain, and it provides local
                fast protection against failure of a node that
                terminates one of the segments comprising this LSP.
                Pritection action is performed by the penultimate node.</div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362349834"><br>
              </div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362350059">My
                2c.<br>
                <br>
                <div
                  id="gmail-m_-4932204748884570604ymail_android_signature"><a
href="https://overview.mail.yahoo.com/mobile/?.src=Android"
                    target="_blank" moz-do-not-send="true">Sent from
                    Yahoo Mail on Android</a></div>
                <br>
                <blockquote style="margin:0px 0px 20px">
                  <div>
                    <div class="gmail-h5">
                      <div
                        style="font-family:Roboto,sans-serif;color:rgb(109,0,246)">
                        <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul
                          Mozhi Perumal</div>
                        <div>&lt;<a href="mailto:muthu.arul@gmail.com"
                            target="_blank" moz-do-not-send="true">muthu.arul@gmail.com</a>&gt;
                          wrote:</div>
                      </div>
                    </div>
                  </div>
                  <div style="padding:10px 0px 0px 20px;margin:10px 0px
                    0px;border-left:1px solid rgb(109,0,246)">
                    <div>
                      <div class="gmail-h5">
                        <div
                          id="gmail-m_-4932204748884570604yiv2858571294">
                          <div dir="ltr">
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Section
                              5.3 of draft-bashandy-rtgwg-<wbr>segment-routing-ti-lfa
                              describes protecting SR policy midpoints
                              against node failure for the case where
                              the active segment is the prefix or
                              adjacency segment of a neighbor.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">I believe
                              the steps described in the procedure is
                              applicable only for a node steering
                              packets into the SR policy. This could be
                              an ingress PE steering IP packets into a
                              SR-TE tunnel or an intermediate node
                              steering labeled packets received with a
                              BSID into a SR-TE tunnel identified by
                              that BSID.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">A transit
                              node that has no idea about the SR policy
                              itself is not expected to perform the
                              procedure described in that section.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Is my
                              understanding correct?</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div>
                          </div>
                        </div>
                      </div>
                    </div>
                    ______________________________<wbr>_________________<br>
                    rtgwg mailing list<br>
                    <a href="mailto:rtgwg@ietf.org" target="_blank"
                      moz-do-not-send="true">rtgwg@ietf.org</a><br>
                    <a
                      href="https://www.ietf.org/mailman/listinfo/rtgwg"
                      target="_blank" moz-do-not-send="true">https://www.ietf.org/mailman/<wbr>listinfo/rtgwg</a><br>
                  </div>
                </blockquote>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
rtgwg mailing list
<a class="moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/rtgwg">https://www.ietf.org/mailman/listinfo/rtgwg</a>
</pre>
    </blockquote>
    <br>
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Mon, 27 Nov 2017 18:25:16 +0530
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Cc: "sasha@axerra.com" <sasha@axerra.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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Assuming ToS stands for Top of the Stack..

The point is, if the ToS is the node/adjacency SID of the neighbor and the
neighbor fails, then for a PLR to be able to find a repair path the PLR
also needs to be the node enforcing the SR policy (i.e imposing the segment
list). This is not very evident from section 5.3 of the draft and my
original request for clarification..

Muthu

On Thu, Nov 23, 2017 at 8:28 PM, Stewart Bryant <stewart.bryant@gmail.com>
wrote:

>
> From my reading of the draft the proposal is  only to try to find the
> conventional shortest repair path from the PLR to the node specified by T=
oS
>
> I have always though that this needed a health warning, as presumably the
> SR path was calculated for a reason and FRR needs to respect that reason.
>
> This is true if ToS is an node-SID, it is even more the case if the ToS i=
s
> an adj-SID.
>
> - Stewart
>
> On 23/11/2017 13:04, Muthu Arul Mozhi Perumal wrote:
>
> My understanding is that draft wants to provide a solution for the proble=
m
> where the active segment is a prefix/adjacency segment of the neighbor an=
d
> the neighbor fails. A solution to this is possible only at a node that is
> enforcing the SR policy (consisting of the segment list). For a transit
> node, its data plane would have to peek into the label stack and determin=
e
> the type of the segment/label following the active segment and act
> accordingly, which is not inline with the SR architecture which requires =
SR
> to work 'as is' on traditional MPLS data plane
>
> =E2=80=8BMuthu=E2=80=8B
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein <vinesasha@yahoo.co=
m
> > wrote:
>
>> Muthu and all,
>> I do not see how the draft in quesrion us related to "SR Policy".
>>
>> From my POV its scope is a SR LSP comprised of multiple Node SIDs within
>> a single IGP domain, and it provides local fast protection against failu=
re
>> of a node that terminates one of the segments comprising this LSP.
>> Pritection action is performed by the penultimate node.
>>
>> My 2c.
>>
>> Sent from Yahoo Mail on Android
>> <https://overview.mail.yahoo.com/mobile/?.src=3DAndroid>
>>
>> On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>> <muthu.arul@gmail.com> wrote:
>> Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>> protecting SR policy midpoints against node failure for the case where t=
he
>> active segment is the prefix or adjacency segment of a neighbor.
>>
>> I believe the steps described in the procedure is applicable only for a
>> node steering packets into the SR policy. This could be an ingress PE
>> steering IP packets into a SR-TE tunnel or an intermediate node steering
>> labeled packets received with a BSID into a SR-TE tunnel identified by t=
hat
>> BSID.
>>
>> A transit node that has no idea about the SR policy itself is not
>> expected to perform the procedure described in that section.
>>
>> Is my understanding correct?
>>
>> Regards,
>> Muthu
>> _______________________________________________
>> rtgwg mailing list
>> rtgwg@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtgwg
>>
>>
>
>
> _______________________________________________
> rtgwg mailing listrtgwg@ietf.orghttps://www.ietf.org/mailman/listinfo/rtg=
wg
>
>
>

--001a11448e4e045c0c055ef66a80
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:arial,he=
lvetica,sans-serif;font-size:small">Assuming ToS stands for Top of the Stac=
k..</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,=
sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D=
"font-family:arial,helvetica,sans-serif;font-size:small">The point is, if t=
he ToS is the node/adjacency SID of the neighbor and the neighbor fails, th=
en for a PLR to be able to find a repair path the PLR also needs to be the =
node enforcing the SR policy (i.e imposing the segment list). This is not v=
ery evident from section 5.3 of the draft and my original request for clari=
fication..</div><div class=3D"gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div>=
<div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Nov 23, 2=
017 at 8:28 PM, Stewart Bryant <span dir=3D"ltr">&lt;<a href=3D"mailto:stew=
art.bryant@gmail.com" target=3D"_blank">stewart.bryant@gmail.com</a>&gt;</s=
pan> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF">
    <p><br>
    </p>
    <p>From my reading of the draft the proposal is=C2=A0 only to try to fi=
nd
      the conventional shortest repair path from the PLR to the node
      specified by ToS<br>
    </p>
    <p>I have always though that this needed a health warning, as
      presumably the SR path was calculated for a reason and FRR needs
      to respect that reason.</p>
    <p>This is true if ToS is an node-SID, it is even more the case if
      the ToS is an adj-SID.</p><span class=3D"HOEnZb"><font color=3D"#8888=
88">
    <p>- Stewart<br>
    </p></font></span><div><div class=3D"h5">
    <br>
    <div class=3D"m_3984499146482628750moz-cite-prefix">On 23/11/2017 13:04=
, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div>
          <div><font face=3D"arial, helvetica,
              sans-serif">My understanding is that draft wants to
              provide a solution for the problem where the active
              segment is a prefix/adjacency segment of the neighbor and
              the neighbor fails. A solution to this is possible only at
              a node that is enforcing the SR policy (consisting of the
              segment list).=C2=A0</font><span style=3D"font-family:arial,h=
elvetica,sans-serif">For a
              transit node, its data plane would have to peek into the
              label stack and determine the type of the segment/label
              following the active segment and act accordingly, which is
              not inline with the SR architecture which requires SR to
              work &#39;as is&#39; on traditional MPLS data plane</span></d=
iv>
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all"><br>
          </div>
        </div>
        <div class=3D"gmail_extra">
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">=E2=80=8BMuthu=E2=80=8B</div>
          <br>
          <div class=3D"gmail_quote">On Wed, Nov 22, 2017 at 8:22 PM,
            Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:vi=
nesasha@yahoo.com" target=3D"_blank">vinesasha@yahoo.com</a>&gt;</span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Muthu and all=
,
              <div id=3D"m_3984499146482628750gmail-m_-4932204748884570604y=
Mail_cursorElementTracker_1511362077836">I
                do not see how the draft in quesrion us related to &quot;SR
                Policy&quot;.</div>
              <div id=3D"m_3984499146482628750gmail-m_-4932204748884570604y=
Mail_cursorElementTracker_1511362111884"><br>
              </div>
              <div id=3D"m_3984499146482628750gmail-m_-4932204748884570604y=
Mail_cursorElementTracker_1511362112091">From
                my POV its scope is a SR LSP comprised of multiple Node
                SIDs within a single IGP domain, and it provides local
                fast protection against failure of a node that
                terminates one of the segments comprising this LSP.
                Pritection action is performed by the penultimate node.</di=
v>
              <div id=3D"m_3984499146482628750gmail-m_-4932204748884570604y=
Mail_cursorElementTracker_1511362349834"><br>
              </div>
              <div id=3D"m_3984499146482628750gmail-m_-4932204748884570604y=
Mail_cursorElementTracker_1511362350059">My
                2c.<br>
                <br>
                <div id=3D"m_3984499146482628750gmail-m_-493220474888457060=
4ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com/mobile=
/?.src=3DAndroid" target=3D"_blank">Sent from
                    Yahoo Mail on Android</a></div>
                <br>
                <blockquote style=3D"margin:0px 0px 20px">
                  <div>
                    <div class=3D"m_3984499146482628750gmail-h5">
                      <div style=3D"font-family:Roboto,sans-serif;color:rgb=
(109,0,246)">
                        <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul
                          Mozhi Perumal</div>
                        <div>&lt;<a href=3D"mailto:muthu.arul@gmail.com" ta=
rget=3D"_blank">muthu.arul@gmail.com</a>&gt;
                          wrote:</div>
                      </div>
                    </div>
                  </div>
                  <div style=3D"padding:10px 0px 0px 20px;margin:10px 0px 0=
px;border-left:1px solid rgb(109,0,246)">
                    <div>
                      <div class=3D"m_3984499146482628750gmail-h5">
                        <div id=3D"m_3984499146482628750gmail-m_-4932204748=
884570604yiv2858571294">
                          <div dir=3D"ltr">
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">Section
                              5.3 of=C2=A0draft-bashandy-rtgwg-segmen<wbr>t=
-routing-ti-lfa
                              describes protecting SR policy midpoints
                              against node failure for the case where
                              the active segment is the prefix or
                              adjacency segment of a neighbor.</div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">I believe
                              the steps described in the procedure is
                              applicable only for a node steering
                              packets into the SR policy. This could be
                              an ingress PE steering IP packets into a
                              SR-TE tunnel or an intermediate node
                              steering labeled packets received with a
                              BSID into a SR-TE tunnel identified by
                              that BSID.</div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">A transit
                              node that has no idea about the SR policy
                              itself is not expected to perform the
                              procedure described in that section.</div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">Is my
                              understanding correct?</div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">Regards,</div>
                            <div class=3D"m_3984499146482628750gmail-m_-493=
2204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,helv=
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Date: Tue, 28 Nov 2017 04:04:53 -0800
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CC: "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Hi,

The behavior described in section 5.3 is clear:
- The top label of incoming packet to node "S" is either a prefix SID 
owned by node "F" or an adjacency SID for (S,F)
- If the link from node "S" to node "F" is up, then the normal behavior 
for node "S" is to apply penultimate hop popping (PHP). HEnce node "S"  
*pops* the top label and sends the packet to node "F"
- But if the link (S,F) is down and "S" is configured to do node 
protection, then node "S" will still pop the top label. This will 
promote the label right underneath the incoming label to become the 
*top* label. Hence there is no need to peek into the label stack
- In a link-state envirnoment, node "S" knows the SRGB of node "F" as 
well as all adjacency SIDs of node "F". Hence it can now compare the new 
top label against the SRGB or the list of adj-SIDs of the node "F"
- If the new top label is within the SRGB of node "F" or an adj-SID of 
node "F", then node "S" applies the behavior described in section 5.3.1 
or section 5.3.2, respectively

The bottom line is that there is no need for any peeking into the label 
stack. Just inspect the new top label

Thanks

Ahmed

On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
> My understanding is that draft wants to provide a solution for the 
> problem where the active segment is a prefix/adjacency segment of the 
> neighbor and the neighbor fails. A solution to this is possible only 
> at a node that is enforcing the SR policy (consisting of the segment 
> list). For a transit node, its data plane would have to peek into the 
> label stack and determine the type of the segment/label following the 
> active segment and act accordingly, which is not inline with the SR 
> architecture which requires SR to work 'as is' on traditional MPLS 
> data plane
>
> Muthu
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein 
> <vinesasha@yahoo.com <mailto:vinesasha@yahoo.com>> wrote:
>
>     Muthu and all,
>     I do not see how the draft in quesrion us related to "SR Policy".
>
>     From my POV its scope is a SR LSP comprised of multiple Node SIDs
>     within a single IGP domain, and it provides local fast protection
>     against failure of a node that terminates one of the segments
>     comprising this LSP. Pritection action is performed by the
>     penultimate node.
>
>     My 2c.
>
>     Sent from Yahoo Mail on Android
>     <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
>         On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>         <muthu.arul@gmail.com <mailto:muthu.arul@gmail.com>> wrote:
>         Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa
>         describes protecting SR policy midpoints against node failure
>         for the case where the active segment is the prefix or
>         adjacency segment of a neighbor.
>
>         I believe the steps described in the procedure is applicable
>         only for a node steering packets into the SR policy. This
>         could be an ingress PE steering IP packets into a SR-TE tunnel
>         or an intermediate node steering labeled packets received with
>         a BSID into a SR-TE tunnel identified by that BSID.
>
>         A transit node that has no idea about the SR policy itself is
>         not expected to perform the procedure described in that section.
>
>         Is my understanding correct?
>
>         Regards,
>         Muthu
>         _______________________________________________
>         rtgwg mailing list
>         rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>         https://www.ietf.org/mailman/listinfo/rtgwg
>         <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>
>
>
> _______________________________________________
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> rtgwg@ietf.org
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<html>
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    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
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  <body bgcolor="#FFFFFF" text="#000000">
    Hi,<br>
    <br>
    The behavior described in section 5.3 is clear: <br>
    - The top label of incoming packet to node "S" is either a prefix
    SID owned by node "F" or an adjacency SID for (S,F)<br>
    - If the link from node "S" to node "F" is up, then the normal
    behavior for node "S" is to apply penultimate hop popping (PHP).
    HEnce node "S"&nbsp; *pops* the top label and sends the packet to node
    "F"<br>
    - But if the link (S,F) is down and "S" is configured to do node
    protection, then node "S" will still pop the top label. This will
    promote the label right underneath the incoming label to become the
    *top* label. Hence there is no need to peek into the label stack<br>
    - In a link-state envirnoment, node "S" knows the SRGB of node "F"
    as well as all adjacency SIDs of node "F". Hence it can now compare
    the new top label against the SRGB or the list of adj-SIDs of the
    node "F"<br>
    - If the new top label is within the SRGB of node "F" or an adj-SID
    of node "F", then node "S" applies the behavior described in section
    5.3.1 or section 5.3.2, respectively<br>
    <br>
    The bottom line is that there is no need for any peeking into the
    label stack. Just inspect the new top label<br>
    <br>
    Thanks<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 11/23/2017 5:04 AM, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote
cite="mid:CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=ISO-8859-1">
      <div dir="ltr">
        <div class="gmail_default">
          <div class="gmail_default"><font face="arial, helvetica,
              sans-serif">My understanding is that draft wants to
              provide a solution for the problem where the active
              segment is a prefix/adjacency segment of the neighbor and
              the neighbor fails. A solution to this is possible only at
              a node that is enforcing the SR policy (consisting of the
              segment list).&nbsp;</font><span
              style="font-family:arial,helvetica,sans-serif">For a
              transit node, its data plane would have to peek into the
              label stack and determine the type of the segment/label
              following the active segment and act accordingly, which is
              not inline with the SR architecture which requires SR to
              work 'as is' on traditional MPLS data plane</span></div>
          <div
            style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
          </div>
        </div>
        <div class="gmail_extra">
          <div class="gmail_default"
            style="font-family:arial,helvetica,sans-serif;font-size:small">&#8203;
            Muthu&#8203;</div>
          <br>
          <div class="gmail_quote">On Wed, Nov 22, 2017 at 8:22 PM,
            Alexander Vainshtein <span dir="ltr">&lt;<a
                moz-do-not-send="true" href="mailto:vinesasha@yahoo.com"
                target="_blank">vinesasha@yahoo.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0px 0px 0px
              0.8ex;border-left:1px solid
              rgb(204,204,204);padding-left:1ex">Muthu and all,
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362077836">I
                do not see how the draft in quesrion us related to "SR
                Policy".</div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362111884"><br>
              </div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362112091">From
                my POV its scope is a SR LSP comprised of multiple Node
                SIDs within a single IGP domain, and it provides local
                fast protection against failure of a node that
                terminates one of the segments comprising this LSP.
                Pritection action is performed by the penultimate node.</div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362349834"><br>
              </div>
              <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362350059">My
                2c.<br>
                <br>
                <div
                  id="gmail-m_-4932204748884570604ymail_android_signature"><a
                    moz-do-not-send="true"
                    href="https://overview.mail.yahoo.com/mobile/?.src=Android"
                    target="_blank">Sent from Yahoo Mail on Android</a></div>
                <br>
                <blockquote style="margin:0px 0px 20px">
                  <div>
                    <div class="gmail-h5">
                      <div
                        style="font-family:Roboto,sans-serif;color:rgb(109,0,246)">
                        <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul
                          Mozhi Perumal</div>
                        <div>&lt;<a moz-do-not-send="true"
                            href="mailto:muthu.arul@gmail.com"
                            target="_blank">muthu.arul@gmail.com</a>&gt;
                          wrote:</div>
                      </div>
                    </div>
                  </div>
                  <div style="padding:10px 0px 0px 20px;margin:10px 0px
                    0px;border-left:1px solid rgb(109,0,246)">
                    <div>
                      <div class="gmail-h5">
                        <div
                          id="gmail-m_-4932204748884570604yiv2858571294">
                          <div dir="ltr">
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Section
                              5.3 of&nbsp;draft-bashandy-rtgwg-<wbr>segment-routing-ti-lfa
                              describes protecting SR policy midpoints
                              against node failure for the case where
                              the active segment is the prefix or
                              adjacency segment of a neighbor.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">I believe
                              the steps described in the procedure is
                              applicable only for a node steering
                              packets into the SR policy. This could be
                              an ingress PE steering IP packets into a
                              SR-TE tunnel or an intermediate node
                              steering labeled packets received with a
                              BSID into a SR-TE tunnel identified by
                              that BSID.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">A transit
                              node that has no idea about the SR policy
                              itself is not expected to perform the
                              procedure described in that section.</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Is my
                              understanding correct?</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                            </div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
                            <div
                              class="gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div>
                          </div>
                        </div>
                      </div>
                    </div>
                    ______________________________<wbr>_________________<br>
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                      href="mailto:rtgwg@ietf.org" target="_blank">rtgwg@ietf.org</a><br>
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                      href="https://www.ietf.org/mailman/listinfo/rtgwg"
                      target="_blank">https://www.ietf.org/mailman/<wbr>listinfo/rtgwg</a><br>
                  </div>
                </blockquote>
              </div>
            </blockquote>
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      <br>
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I do not understand the question

Ahmed

On 11/23/2017 5:15 AM, Huzhibo wrote:
>
> Because the normal FRR can not protect the designated node of SR-TE, a 
> method is provided to perform the label POP action by the penultimate 
> hop of the specified node replacing the specified node and forward it 
> to the node corresponding to the next label. However, Here are some 
> questions we can discuss, if it is a loose path, SR-TE designated node 
> failure, the packet can not be forwarded to the penultimate hop of the 
> specified node.
>
> *? ??:*rtgwg [mailto:rtgwg-bounces@ietf.org] *? ? *Muthu Arul Mozhi 
> Perumal
> *? ???:*2017?11?23?21:04
> *???:*sasha@axerra.com
> *??:*rtgwg@ietf.org
> *??:*Re: Protecting SR policy midpoints 
> (draft-bashandy-rtgwg-segment-routing-ti-lfa)
>
> My understanding is that draft wants to provide a solution for the 
> problem where the active segment is a prefix/adjacency segment of the 
> neighbor and the neighbor fails. A solution to this is possible only 
> at a node that is enforcing the SR policy (consisting of the segment 
> list). For a transit node, its data plane would have to peek into the 
> label stack and determine the type of the segment/label following the 
> active segment and act accordingly, which is not inline with the SR 
> architecture which requires SR to work 'as is' on traditional MPLS 
> data plane
>
> Muthu
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein 
> <vinesasha@yahoo.com <mailto:vinesasha@yahoo.com>> wrote:
>
>     Muthu and all,
>
>     I do not see how the draft in quesrion us related to "SR Policy".
>
>     From my POV its scope is a SR LSP comprised of multiple Node SIDs
>     within a single IGP domain, and it provides local fast protection
>     against failure of a node that terminates one of the segments
>     comprising this LSP. Pritection action is performed by the
>     penultimate node.
>
>     My 2c.
>
>     Sent from Yahoo Mail on Android
>     <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
>         On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>
>         <muthu.arul@gmail.com <mailto:muthu.arul@gmail.com>> wrote:
>
>         Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa
>         describes protecting SR policy midpoints against node failure
>         for the case where the active segment is the prefix or
>         adjacency segment of a neighbor.
>
>         I believe the steps described in the procedure is applicable
>         only for a node steering packets into the SR policy. This
>         could be an ingress PE steering IP packets into a SR-TE tunnel
>         or an intermediate node steering labeled packets received with
>         a BSID into a SR-TE tunnel identified by that BSID.
>
>         A transit node that has no idea about the SR policy itself is
>         not expected to perform the procedure described in that section.
>
>         Is my understanding correct?
>
>         Regards,
>
>         Muthu
>
>         _______________________________________________
>         rtgwg mailing list
>         rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>         https://www.ietf.org/mailman/listinfo/rtgwg
>
>
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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    I do not understand the question<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 11/23/2017 5:15 AM, Huzhibo wrote:<br>
    </div>
    <blockquote
cite="mid:06CF729DA0D6854E8C1E5121AC3330DF9E062994@NKGEML515-MBX.china.huawei.com"
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="font-family:&quot;Arial&quot;,sans-serif;color:#222222"
            lang="EN">Because the normal FRR can not protect the
            designated node of SR-TE, a method is provided to perform
            the label POP action by the penultimate hop of the specified
            node replacing the specified node and forward it to the node
            corresponding to the next label. However, Here are some
            questions we can discuss, if it is a loose path, SR-TE
            designated node failure, the packet can not be forwarded to
            the penultimate hop of the specified node.</span><span
style="font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"
            lang="EN"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"
            lang="EN-US"><o:p>&nbsp;</o:p></span></p>
        <p class="MsoNormal"><b><span
              style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif">&#21457;
              &#20214;&#20154;<span lang="EN-US">:</span></span></b><span
            style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif"
            lang="EN-US"> rtgwg [<a class="moz-txt-link-freetext" href="mailto:rtgwg-bounces@ietf.org">mailto:rtgwg-bounces@ietf.org</a>]
          </span><b><span
              style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif">&#20195;
              &#34920; </span>
          </b><span
            style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif"
            lang="EN-US">Muthu Arul Mozhi Perumal<br>
          </span><b><span
              style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif">&#21457;
              &#36865;&#26102;&#38388;<span lang="EN-US">:</span></span></b><span
            style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif"
            lang="EN-US"> 2017</span><span
            style="font-size:11.0pt;font-family:&quot;&#24494;&#36719;&#38597;&#40657;&quot;,sans-serif">&#24180;<span
              lang="EN-US">11</span>&#26376;<span lang="EN-US">23</span>&#26085;<span
              lang="EN-US"> 21:04<br>
            </span><b>&#25910;&#20214;&#20154;<span lang="EN-US">:</span></b><span
              lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:sasha@axerra.com">sasha@axerra.com</a><br>
            </span><b>&#25220;&#36865;<span lang="EN-US">:</span></b><span
              lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br>
            </span><b>&#20027;&#39064;<span lang="EN-US">:</span></b><span
              lang="EN-US"> Re: Protecting SR policy midpoints
              (draft-bashandy-rtgwg-segment-routing-ti-lfa)<o:p></o:p></span></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
        <div>
          <div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif"
                  lang="EN-US">My understanding is that draft wants to
                  provide a solution for the problem where the active
                  segment is a prefix/adjacency segment of the neighbor
                  and the neighbor fails. A solution to this is possible
                  only at a node that is enforcing the SR policy
                  (consisting of the segment list).&nbsp;For a transit node,
                  its data plane would have to peek into the label stack
                  and determine the type of the segment/label following
                  the active segment and act accordingly, which is not
                  inline with the SR architecture which requires SR to
                  work 'as is' on traditional MPLS data plane</span><span
                  lang="EN-US"><o:p></o:p></span></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif"
                  lang="EN-US"><o:p>&nbsp;</o:p></span></p>
            </div>
          </div>
          <div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif"
                  lang="EN-US">&#8203;Muthu&#8203;<o:p></o:p></span></p>
            </div>
            <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
            <div>
              <p class="MsoNormal"><span lang="EN-US">On Wed, Nov 22,
                  2017 at 8:22 PM, Alexander Vainshtein &lt;<a
                    moz-do-not-send="true"
                    href="mailto:vinesasha@yahoo.com" target="_blank">vinesasha@yahoo.com</a>&gt;
                  wrote:<o:p></o:p></span></p>
              <blockquote style="border:none;border-left:solid #CCCCCC
                1.0pt;padding:0cm 0cm 0cm
                6.0pt;margin-left:4.8pt;margin-right:0cm">
                <p class="MsoNormal"><span lang="EN-US">Muthu and all,<o:p></o:p></span></p>
                <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362077836">
                  <p class="MsoNormal"><span lang="EN-US">I do not see
                      how the draft in quesrion us related to "SR
                      Policy".<o:p></o:p></span></p>
                </div>
                <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362111884">
                  <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                </div>
                <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362112091">
                  <p class="MsoNormal"><span lang="EN-US">From my POV
                      its scope is a SR LSP comprised of multiple Node
                      SIDs within a single IGP domain, and it provides
                      local fast protection against failure of a node
                      that terminates one of the segments comprising
                      this LSP. Pritection action is performed by the
                      penultimate node.<o:p></o:p></span></p>
                </div>
                <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362349834">
                  <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                </div>
                <div
id="gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362350059">
                  <p class="MsoNormal" style="margin-bottom:12.0pt"><span
                      lang="EN-US">My 2c.<o:p></o:p></span></p>
                  <div
                    id="gmail-m_-4932204748884570604ymail_android_signature">
                    <p class="MsoNormal"><span lang="EN-US"><a
                          moz-do-not-send="true"
                          href="https://overview.mail.yahoo.com/mobile/?.src=Android"
                          target="_blank">Sent from Yahoo Mail on
                          Android</a><o:p></o:p></span></p>
                  </div>
                  <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                  <blockquote
                    style="margin-left:0cm;margin-right:0cm;margin-bottom:15.0pt">
                    <div>
                      <div>
                        <div>
                          <div>
                            <p class="MsoNormal"><span
                                style="font-family:&quot;Arial&quot;,sans-serif;color:#6D00F6"
                                lang="EN-US">On Wed, Nov 22, 2017 at
                                3:27, Muthu Arul Mozhi Perumal<o:p></o:p></span></p>
                          </div>
                          <div>
                            <p class="MsoNormal"><span
                                style="font-family:&quot;Arial&quot;,sans-serif;color:#6D00F6"
                                lang="EN-US">&lt;<a
                                  moz-do-not-send="true"
                                  href="mailto:muthu.arul@gmail.com"
                                  target="_blank">muthu.arul@gmail.com</a>&gt;
                                wrote:<o:p></o:p></span></p>
                          </div>
                        </div>
                      </div>
                    </div>
                    <div style="border:none;border-left:solid #6D00F6
                      1.0pt;padding:0cm 0cm 0cm 15.0pt;margin-top:7.5pt">
                      <div>
                        <div>
                          <div
                            id="gmail-m_-4932204748884570604yiv2858571294">
                            <div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">Section 5.3
                                    of&nbsp;draft-bashandy-rtgwg-segment-routing-ti-lfa
                                    describes protecting SR policy
                                    midpoints against node failure for
                                    the case where the active segment is
                                    the prefix or adjacency segment of a
                                    neighbor.<o:p></o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">I believe the steps
                                    described in the procedure is
                                    applicable only for a node steering
                                    packets into the SR policy. This
                                    could be an ingress PE steering IP
                                    packets into a SR-TE tunnel or an
                                    intermediate node steering labeled
                                    packets received with a BSID into a
                                    SR-TE tunnel identified by that
                                    BSID.<o:p></o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">A transit node that has
                                    no idea about the SR policy itself
                                    is not expected to perform the
                                    procedure described in that section.<o:p></o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">Is my understanding
                                    correct?<o:p></o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US"><o:p>&nbsp;</o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">Regards,<o:p></o:p></span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span
                                    style="font-family:&quot;Arial&quot;,sans-serif"
                                    lang="EN-US">Muthu<o:p></o:p></span></p>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                      <p class="MsoNormal"><span lang="EN-US">_______________________________________________<br>
                          rtgwg mailing list<br>
                          <a moz-do-not-send="true"
                            href="mailto:rtgwg@ietf.org" target="_blank">rtgwg@ietf.org</a><br>
                          <a moz-do-not-send="true"
                            href="https://www.ietf.org/mailman/listinfo/rtgwg"
                            target="_blank">https://www.ietf.org/mailman/listinfo/rtgwg</a><o:p></o:p></span></p>
                    </div>
                  </blockquote>
                </div>
              </blockquote>
            </div>
            <p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
          </div>
        </div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
rtgwg mailing list
<a class="moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/rtgwg">https://www.ietf.org/mailman/listinfo/rtgwg</a>
</pre>
    </blockquote>
    <br>
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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 28 Nov 2017 15:38:25 +0100
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
Cc: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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Hi Ahmed,

> - In a link-state envirnoment, node "S" knows the SRGB of node "F" as
well as all adjacency SIDs of node "F"

What you say is all true, but the way I read the question of this thread
seems to be what happens in the cases where node S has no clue of the new
top label. Say it was controller imposed EPE label or worse it is a VPN
label.

In the former EPE case the packet could still be "rescued" by picking into
IP header. After all EPE is just an optimization.

However in the latter case where we are carrying L2 or L3 VPNs packet
header after the label stack may not help or may be even a security issue
if node S would start to make routing decision in global RIB based on
customer's space.

So I think the point to document is what is the expected behavior of S
node in case of new top label is unknown. It is ok to say drop it, but I
think it needs to be clearly stated.

Best,
Robert


On Tue, Nov 28, 2017 at 1:04 PM, Ahmed Bashandy (bashandy) <
bashandy@cisco.com> wrote:

> Hi,
>
> The behavior described in section 5.3 is clear:
> - The top label of incoming packet to node "S" is either a prefix SID
> owned by node "F" or an adjacency SID for (S,F)
> - If the link from node "S" to node "F" is up, then the normal behavior
> for node "S" is to apply penultimate hop popping (PHP). HEnce node "S"
> *pops* the top label and sends the packet to node "F"
> - But if the link (S,F) is down and "S" is configured to do node
> protection, then node "S" will still pop the top label. This will promote
> the label right underneath the incoming label to become the *top* label.
> Hence there is no need to peek into the label stack
> - In a link-state envirnoment, node "S" knows the SRGB of node "F" as wel=
l
> as all adjacency SIDs of node "F". Hence it can now compare the new top
> label against the SRGB or the list of adj-SIDs of the node "F"
> - If the new top label is within the SRGB of node "F" or an adj-SID of
> node "F", then node "S" applies the behavior described in section 5.3.1 o=
r
> section 5.3.2, respectively
>
> The bottom line is that there is no need for any peeking into the label
> stack. Just inspect the new top label
>
> Thanks
>
> Ahmed
>
>
> On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
>
> My understanding is that draft wants to provide a solution for the proble=
m
> where the active segment is a prefix/adjacency segment of the neighbor an=
d
> the neighbor fails. A solution to this is possible only at a node that is
> enforcing the SR policy (consisting of the segment list). For a transit
> node, its data plane would have to peek into the label stack and determin=
e
> the type of the segment/label following the active segment and act
> accordingly, which is not inline with the SR architecture which requires =
SR
> to work 'as is' on traditional MPLS data plane
>
> =E2=80=8B Muthu=E2=80=8B
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein <vinesasha@yahoo.co=
m
> > wrote:
>
>> Muthu and all,
>> I do not see how the draft in quesrion us related to "SR Policy".
>>
>> From my POV its scope is a SR LSP comprised of multiple Node SIDs within
>> a single IGP domain, and it provides local fast protection against failu=
re
>> of a node that terminates one of the segments comprising this LSP.
>> Pritection action is performed by the penultimate node.
>>
>> My 2c.
>>
>> Sent from Yahoo Mail on Android
>> <https://overview.mail.yahoo.com/mobile/?.src=3DAndroid>
>>
>> On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>> <muthu.arul@gmail.com> wrote:
>> Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>> protecting SR policy midpoints against node failure for the case where t=
he
>> active segment is the prefix or adjacency segment of a neighbor.
>>
>> I believe the steps described in the procedure is applicable only for a
>> node steering packets into the SR policy. This could be an ingress PE
>> steering IP packets into a SR-TE tunnel or an intermediate node steering
>> labeled packets received with a BSID into a SR-TE tunnel identified by t=
hat
>> BSID.
>>
>> A transit node that has no idea about the SR policy itself is not
>> expected to perform the procedure described in that section.
>>
>> Is my understanding correct?
>>
>> Regards,
>> Muthu
>> _______________________________________________
>> rtgwg mailing list
>> rtgwg@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtgwg
>>
>>
>
>
> _______________________________________________
> rtgwg mailing listrtgwg@ietf.orghttps://www.ietf.org/mailman/listinfo/rtg=
wg
>
>
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg
>
>

--001a114ab778c07555055f0bf88a
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Ahmed,</div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br><=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font-si=
ze:12.8px">&gt; - In a link-state envirnoment, node &quot;S&quot; knows the=
 SRGB of node &quot;F&quot; as well as all adjacency SIDs of node &quot;F&q=
uot;</span><br></div><div class=3D"gmail_default" style=3D"font-family:aria=
l,helvetica,sans-serif;font-size:small"><span style=3D"font-family:arial,sa=
ns-serif;font-size:12.8px"><br></span></div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><span style=
=3D"font-family:arial,sans-serif;font-size:12.8px">What you say is all true=
, but the way I read the question of this thread seems to be what happens i=
n the cases where node S has no clue of the new top label. Say it was contr=
oller imposed EPE label or worse it is a VPN label.=C2=A0</span></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small"><span style=3D"font-family:arial,sans-serif;font-size:12.8px"=
><br></span></div><div class=3D"gmail_default" style=3D"font-family:arial,h=
elvetica,sans-serif;font-size:small"><span style=3D"font-family:arial,sans-=
serif;font-size:12.8px">In the former EPE case the packet could still be &q=
uot;rescued&quot; by picking into IP header. After all EPE is just an optim=
ization.=C2=A0</span></div><div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:small"><span style=3D"font-family:ar=
ial,sans-serif;font-size:12.8px"><br></span></div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><span =
style=3D"font-family:arial,sans-serif;font-size:12.8px">However in the latt=
er case where we are carrying L2 or L3 VPNs packet header after the label s=
tack may not help or may be even a security issue if node S would start to =
make routing decision in global RIB based on customer&#39;s space.=C2=A0</s=
pan></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;fo=
nt-size:12.8px"><br></span></div><div class=3D"gmail_default" style=3D""><s=
pan style=3D"font-size:12.8px">So I think the point to document is what is =
the expected behavior of S node=C2=A0in case of new top label is unknown. I=
t is ok to say drop it, but I think it needs to be clearly stated.=C2=A0</s=
pan></div><div class=3D"gmail_default" style=3D""><span style=3D"font-size:=
12.8px"><br></span></div><div class=3D"gmail_default" style=3D""><span styl=
e=3D"font-size:12.8px">Best,</span></div><div class=3D"gmail_default" style=
=3D""><span style=3D"font-size:12.8px">Robert</span></div><div class=3D"gma=
il_default" style=3D""><br></div></div><div class=3D"gmail_extra"><br><div =
class=3D"gmail_quote">On Tue, Nov 28, 2017 at 1:04 PM, Ahmed Bashandy (bash=
andy) <span dir=3D"ltr">&lt;<a href=3D"mailto:bashandy@cisco.com" target=3D=
"_blank">bashandy@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Hi,<br>
    <br>
    The behavior described in section 5.3 is clear: <br>
    - The top label of incoming packet to node &quot;S&quot; is either a pr=
efix
    SID owned by node &quot;F&quot; or an adjacency SID for (S,F)<br>
    - If the link from node &quot;S&quot; to node &quot;F&quot; is up, then=
 the normal
    behavior for node &quot;S&quot; is to apply penultimate hop popping (PH=
P).
    HEnce node &quot;S&quot;=C2=A0 *pops* the top label and sends the packe=
t to node
    &quot;F&quot;<br>
    - But if the link (S,F) is down and &quot;S&quot; is configured to do n=
ode
    protection, then node &quot;S&quot; will still pop the top label. This =
will
    promote the label right underneath the incoming label to become the
    *top* label. Hence there is no need to peek into the label stack<br>
    - In a link-state envirnoment, node &quot;S&quot; knows the SRGB of nod=
e &quot;F&quot;
    as well as all adjacency SIDs of node &quot;F&quot;. Hence it can now c=
ompare
    the new top label against the SRGB or the list of adj-SIDs of the
    node &quot;F&quot;<br>
    - If the new top label is within the SRGB of node &quot;F&quot; or an a=
dj-SID
    of node &quot;F&quot;, then node &quot;S&quot; applies the behavior des=
cribed in section
    5.3.1 or section 5.3.2, respectively<br>
    <br>
    The bottom line is that there is no need for any peeking into the
    label stack. Just inspect the new top label<br>
    <br>
    Thanks<span class=3D"HOEnZb"><font color=3D"#888888"><br>
    <br>
    Ahmed</font></span><div><div class=3D"h5"><br>
    <br>
    <div class=3D"m_-3270397455230933547moz-cite-prefix">On 11/23/2017 5:04=
 AM, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div class=3D"gmail_default">
          <div class=3D"gmail_default"><font face=3D"arial, helvetica,
              sans-serif">My understanding is that draft wants to
              provide a solution for the problem where the active
              segment is a prefix/adjacency segment of the neighbor and
              the neighbor fails. A solution to this is possible only at
              a node that is enforcing the SR policy (consisting of the
              segment list).=C2=A0</font><span style=3D"font-family:arial,h=
elvetica,sans-serif">For a
              transit node, its data plane would have to peek into the
              label stack and determine the type of the segment/label
              following the active segment and act accordingly, which is
              not inline with the SR architecture which requires SR to
              work &#39;as is&#39; on traditional MPLS data plane</span></d=
iv>
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all"><br>
          </div>
        </div>
        <div class=3D"gmail_extra">
          <div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small">=E2=80=8B
            Muthu=E2=80=8B</div>
          <br>
          <div class=3D"gmail_quote">On Wed, Nov 22, 2017 at 8:22 PM,
            Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:vi=
nesasha@yahoo.com" target=3D"_blank">vinesasha@yahoo.com</a>&gt;</span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Muthu and all=
,
              <div id=3D"m_-3270397455230933547gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362077836">I
                do not see how the draft in quesrion us related to &quot;SR
                Policy&quot;.</div>
              <div id=3D"m_-3270397455230933547gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362111884"><br>
              </div>
              <div id=3D"m_-3270397455230933547gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362112091">From
                my POV its scope is a SR LSP comprised of multiple Node
                SIDs within a single IGP domain, and it provides local
                fast protection against failure of a node that
                terminates one of the segments comprising this LSP.
                Pritection action is performed by the penultimate node.</di=
v>
              <div id=3D"m_-3270397455230933547gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362349834"><br>
              </div>
              <div id=3D"m_-3270397455230933547gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362350059">My
                2c.<br>
                <br>
                <div id=3D"m_-3270397455230933547gmail-m_-49322047488845706=
04ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com/mobil=
e/?.src=3DAndroid" target=3D"_blank">Sent from Yahoo Mail on Android</a></d=
iv>
                <br>
                <blockquote style=3D"margin:0px 0px 20px">
                  <div>
                    <div class=3D"m_-3270397455230933547gmail-h5">
                      <div style=3D"font-family:Roboto,sans-serif;color:rgb=
(109,0,246)">
                        <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul
                          Mozhi Perumal</div>
                        <div>&lt;<a href=3D"mailto:muthu.arul@gmail.com" ta=
rget=3D"_blank">muthu.arul@gmail.com</a>&gt;
                          wrote:</div>
                      </div>
                    </div>
                  </div>
                  <div style=3D"padding:10px 0px 0px 20px;margin:10px 0px 0=
px;border-left:1px solid rgb(109,0,246)">
                    <div>
                      <div class=3D"m_-3270397455230933547gmail-h5">
                        <div id=3D"m_-3270397455230933547gmail-m_-493220474=
8884570604yiv2858571294">
                          <div dir=3D"ltr">
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Section
                              5.3 of=C2=A0draft-bashandy-rtgwg-segmen<wbr>t=
-routing-ti-lfa
                              describes protecting SR policy midpoints
                              against node failure for the case where
                              the active segment is the prefix or
                              adjacency segment of a neighbor.</div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">I believe
                              the steps described in the procedure is
                              applicable only for a node steering
                              packets into the SR policy. This could be
                              an ingress PE steering IP packets into a
                              SR-TE tunnel or an intermediate node
                              steering labeled packets received with a
                              BSID into a SR-TE tunnel identified by
                              that BSID.</div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">A transit
                              node that has no idea about the SR policy
                              itself is not expected to perform the
                              procedure described in that section.</div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Is my
                              understanding correct?</div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Regards,</div>
                            <div class=3D"m_-3270397455230933547gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Muthu</div>
                          </div>
                        </div>
                      </div>
                    </div>
                    ______________________________<wbr>_________________<br=
>
                    rtgwg mailing list<br>
                    <a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtg=
wg@ietf.org</a><br>
                    <a href=3D"https://www.ietf.org/mailman/listinfo/rtgwg"=
 target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/rtgwg</a><br>
                  </div>
                </blockquote>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
      </div>
      <br>
      <fieldset class=3D"m_-3270397455230933547mimeAttachmentHeader"></fiel=
dset>
      <br>
      <pre>______________________________<wbr>_________________
rtgwg mailing list
<a class=3D"m_-3270397455230933547moz-txt-link-abbreviated" href=3D"mailto:=
rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>
<a class=3D"m_-3270397455230933547moz-txt-link-freetext" href=3D"https://ww=
w.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">https://www.ietf.org/m=
ailman/<wbr>listinfo/rtgwg</a>
</pre>
    </blockquote>
    <br>
  </div></div></div>

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

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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com>
From: Stewart Bryant <stewart.bryant@gmail.com>
Message-ID: <8948158b-6fbe-4458-476a-ea1f8f34ee6c@gmail.com>
Date: Tue, 28 Nov 2017 15:15:07 +0000
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On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
>
> - The top label of incoming packet to node "S" is either a prefix SID 
> owned by node "F" or an adjacency SID for (S,F)

If it is an adjacency SID for (S,F) then you are violating the original 
intent of the ingress PE which was to send the packet along the path 
S->F. I really don't think you can blindly repair such a packet since to 
do so violates the policy applied to the packet. You have to do a policy 
check, and you have to make sure that the packet is not subject to ECMP 
along the repair path since ECMP avoidance might have been the intent of 
using the SR Adjacency in the first place.

- Stewart


From nobody Tue Nov 28 08:04:23 2017
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Date: Tue, 28 Nov 2017 16:04:15 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "bashandy@cisco.com" <bashandy@cisco.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>,  "sasha@axerra.com" <sasha@axerra.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
Message-ID: <1776763839.4755621.1511885056113@mail.yahoo.com>
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References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Ahmed and all,Two points:1. From my POV your description of forwarding behavior when the link S-->F fails is incomplete: the top label in the stack may be poppoed, but it is not "forgotten", and the next exposed label is looked up by S in the context label space that is F-specific. I.e., if S has two downstream neighbors, F and G, and both links S-->F and S-->G fail, lookup of the next exposed label for packets with ToS being S label for F and S label for G will yield different results.
2. From my POV draft-hegde-spring-node-protection-for-sr-te-paths provides roughly equjvalent behavior, but it is much more clear when it comes to describibg the DP mechanisms involved. (IMHO and FWIW calling a spae by its name is greatly preferable in most cases.)
My 2c


Sent from Yahoo Mail on Android 
 
  On Tue, Nov 28, 2017 at 6:04, Ahmed Bashandy (bashandy)<bashandy@cisco.com> wrote:   _______________________________________________
rtgwg mailing list
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Ahmed and all,<div id=3D"yMail_cursorElementTracker_1511884139259">Two poin=
ts:</div><div id=3D"yMail_cursorElementTracker_1511884149057">1. From my PO=
V your description of forwarding behavior when the link S--&gt;F fails is i=
ncomplete: the top label in the stack may be poppoed, but it is not "forgot=
ten", and the next exposed label is looked up by S in the context label spa=
ce that is F-specific. I.e., if S has two downstream neighbors, F and G, an=
d both links S--&gt;F and S--&gt;G fail, lookup of the next exposed label f=
or packets with ToS being S label for F and S label for G will yield differ=
ent results.</div><div id=3D"yMail_cursorElementTracker_1511884622902"><br>=
</div><div id=3D"yMail_cursorElementTracker_1511884624096">2. From my POV d=
raft-hegde-spring-node-protection-for-sr-te-paths provides roughly equjvale=
nt behavior, but it is much more clear when it comes to describibg the DP m=
echanisms involved. (IMHO and FWIW calling a spae by its name is greatly pr=
eferable in most cases.)</div><div id=3D"yMail_cursorElementTracker_1511885=
039917"><br></div><div id=3D"yMail_cursorElementTracker_1511885040531">My 2=
c<br><div id=3D"yMail_cursorElementTracker_1511883906072"><br></div><div id=
=3D"yMail_cursorElementTracker_1511883916905"><br><div id=3D"ymail_android_=
signature"><a href=3D"https://overview.mail.yahoo.com/mobile/?.src=3DAndroi=
d">Sent from Yahoo Mail on Android</a></div> <br> <blockquote style=3D"marg=
in: 0 0 20px 0;"> <div style=3D"font-family:Roboto, sans-serif; color:#6D00=
F6;"> <div>On Tue, Nov 28, 2017 at 6:04, Ahmed Bashandy (bashandy)</div><di=
v>&lt;bashandy@cisco.com&gt; wrote:</div> </div> <div style=3D"padding: 10p=
x 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> _________=
______________________________________<br clear=3D"none">rtgwg mailing list=
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Date: Tue, 28 Nov 2017 16:12:20 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "stewart.bryant@gmail.com" <stewart.bryant@gmail.com>,  "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>,  "vinesasha@yahoo.com" <vinesasha@yahoo.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Stewart,I understand your concern. However, as I see it, the alternatives t=
o local protection of a failed pinned node of a SR-TE LSP are somewhat limi=
ted:
1. You can wait (with no traffic) until failure of the pinned node is recog=
nized (e.g., fillowing IGP cobversion) and a new policy(that does not incku=
de the failed node) is recomputed and installed.=C2=A0
2. You can pre-compute and pre-install a backup policy that does not have a=
ny common pinned nodes with the original ones and, once the origibal policy=
 fails, switch ti the backup one end-to-end.
My 2c.


Sent from Yahoo Mail on Android=20
=20
  On Tue, Nov 28, 2017 at 9:15, Stewart Bryant<stewart.bryant@gmail.com> wr=
ote:  =20

On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
>
> - The top label of incoming packet to node "S" is either a prefix SID=20
> owned by node "F" or an adjacency SID for (S,F)

If it is an adjacency SID for (S,F) then you are violating the original=20
intent of the ingress PE which was to send the packet along the path=20
S->F. I really don't think you can blindly repair such a packet since to=20
do so violates the policy applied to the packet. You have to do a policy=20
check, and you have to make sure that the packet is not subject to ECMP=20
along the repair path since ECMP avoidance might have been the intent of=20
using the SR Adjacency in the first place.

- Stewart

_______________________________________________
rtgwg mailing list
rtgwg@ietf.org
https://www.ietf.org/mailman/listinfo/rtgwg
 =20

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Stewart,<div id=3D"yMail_cursorElementTracker_1511885159915">I understand y=
our concern. However, as I see it, the alternatives to local protection of =
a failed pinned node of a SR-TE LSP are somewhat limited:</div><div id=3D"y=
Mail_cursorElementTracker_1511885274373"><br></div><div id=3D"yMail_cursorE=
lementTracker_1511885274527">1. You can wait (with no traffic) until failur=
e of the pinned node is recognized (e.g., fillowing IGP cobversion) and a n=
ew policy(that does not inckude the failed node) is recomputed and installe=
d.&nbsp;</div><div id=3D"yMail_cursorElementTracker_1511885413457"><br></di=
v><div id=3D"yMail_cursorElementTracker_1511885414040">2. You can pre-compu=
te and pre-install a backup policy that does not have any common pinned nod=
es with the original ones and, once the origibal policy fails, switch ti th=
e backup one end-to-end.</div><div id=3D"yMail_cursorElementTracker_1511885=
527265"><br></div><div id=3D"yMail_cursorElementTracker_1511885527436">My 2=
c.</div><div id=3D"yMail_cursorElementTracker_1511885511094"><br></div><div=
 id=3D"yMail_cursorElementTracker_1511885511284"><br id=3D"yMail_cursorElem=
entTracker_1511885102336"><br><div id=3D"ymail_android_signature"><a href=
=3D"https://overview.mail.yahoo.com/mobile/?.src=3DAndroid">Sent from Yahoo=
 Mail on Android</a></div> <br> <blockquote style=3D"margin: 0 0 20px 0;"> =
<div style=3D"font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Tue,=
 Nov 28, 2017 at 9:15, Stewart Bryant</div><div>&lt;stewart.bryant@gmail.co=
m&gt; wrote:</div> </div> <div style=3D"padding: 10px 0 0 20px; margin: 10p=
x 0 0 0; border-left: 1px solid #6D00F6;"> <br clear=3D"none"><br clear=3D"=
none">On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:<br clear=3D"non=
e">&gt;<br clear=3D"none">&gt; - The top label of incoming packet to node "=
S" is either a prefix SID <br clear=3D"none">&gt; owned by node "F" or an a=
djacency SID for (S,F)<br clear=3D"none"><br clear=3D"none">If it is an adj=
acency SID for (S,F) then you are violating the original <br clear=3D"none"=
>intent of the ingress PE which was to send the packet along the path <br c=
lear=3D"none">S-&gt;F. I really don't think you can blindly repair such a p=
acket since to <br clear=3D"none">do so violates the policy applied to the =
packet. You have to do a policy <br clear=3D"none">check, and you have to m=
ake sure that the packet is not subject to ECMP <br clear=3D"none">along th=
e repair path since ECMP avoidance might have been the intent of <br clear=
=3D"none">using the SR Adjacency in the first place.<br clear=3D"none"><br =
clear=3D"none">- Stewart<div class=3D"yqt8419071237 yQTDBase" id=3D"yqtfd59=
910"><br clear=3D"none"><br clear=3D"none">________________________________=
_______________<br clear=3D"none">rtgwg mailing list<br clear=3D"none"><a s=
hape=3D"rect" ymailto=3D"mailto:rtgwg@ietf.org" href=3D"mailto:rtgwg@ietf.o=
rg">rtgwg@ietf.org</a><br clear=3D"none"><a shape=3D"rect" href=3D"https://=
www.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">https://www.ietf.org=
/mailman/listinfo/rtgwg</a><br clear=3D"none"></div> </div> </blockquote></=
div>
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Subject: Last Call: <draft-ietf-rtgwg-yang-rip-06.txt> (A YANG Data Model for Routing Information Protocol (RIP)) to Proposed Standard
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The IESG has received a request from the Routing Area Working Group WG
(rtgwg) to consider the following document: - 'A YANG Data Model for Routing
Information Protocol (RIP)'
  <draft-ietf-rtgwg-yang-rip-06.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2017-12-12. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the beginning of
the Subject line to allow automated sorting.

Abstract


   This document describes a data model for the Routing Information
   Protocol (RIP).  Both RIP version 2 and RIPng are covered.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-rip/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-rip/ballot/


No IPR declarations have been submitted directly on this I-D.


The document contains these normative downward references.
See RFC 3967 for additional information: 
    draft-bjorklund-netmod-rfc7223bis: A YANG Data Model for Interface Management (None - IETF stream)
    draft-ietf-netmod-revised-datastores: Network Management Datastore Architecture (None - IETF stream)
    draft-acee-netmod-rfc8022bis: A YANG Data Model for Routing Management (NDMA Version) (None - )
    draft-bjorklund-netmod-rfc7277bis: A YANG Data Model for IP Management (None - IETF stream)
    draft-ietf-ospf-yang: Yang Data Model for OSPF Protocol (None - IETF stream)




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Subject: Last Call: <draft-ietf-rtgwg-yang-vrrp-07.txt> (A YANG Data Model for Virtual Router Redundancy Protocol (VRRP)) to Proposed Standard
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Abstract


   This document describes a data model for Virtual Router Redundancy
   Protocol (VRRP).  Both version 2 and version 3 of VRRP are covered.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/ballot/


No IPR declarations have been submitted directly on this I-D.


The document contains these normative downward references.
See RFC 3967 for additional information: 
    draft-bjorklund-netmod-rfc7277bis: A YANG Data Model for IP Management (None - IETF stream)
    draft-bjorklund-netmod-rfc7223bis: A YANG Data Model for Interface Management (None - IETF stream)
    draft-ietf-netmod-revised-datastores: Network Management Datastore Architecture (None - IETF stream)




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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 28 Nov 2017 22:24:20 +0530
Message-ID: <CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
Cc: "sasha@axerra.com" <sasha@axerra.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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On Tue, Nov 28, 2017 at 5:34 PM, Ahmed Bashandy (bashandy) <
bashandy@cisco.com> wrote:

> Hi,
>
> The behavior described in section 5.3 is clear:
> - The top label of incoming packet to node "S" is either a prefix SID
> owned by node "F" or an adjacency SID for (S,F)
> - If the link from node "S" to node "F" is up, then the normal behavior
> for node "S" is to apply penultimate hop popping (PHP). HEnce node "S"
> *pops* the top label and sends the packet to node "F"
> - But if the link (S,F) is down and "S" is configured to do node
> protection, then node "S" will still pop the top label. This will promote
> the label right underneath the incoming label to become the *top* label.
> Hence there is no need to peek into the label stack
>

=E2=80=8BWhat if the new top label is a BSID assigned from the SRLB of node=
 F or a
BGP-LU or a VPN label assigned by node F?=E2=80=8B


> - In a link-state envirnoment, node "S" knows the SRGB of node "F" as wel=
l
> as all adjacency SIDs of node "F". Hence it can now compare the new top
> label against the SRGB or the list of adj-SIDs of the node "F"
>

=E2=80=8BWhat does "it" stand for in "it can now compare"?

=E2=80=8BFor the control plane to be able to compare it also needs to be im=
posing
the SR policy as I said earlier.

Or is the MPLS data plane expected to do such a comparison on the fly?


> - If the new top label is within the SRGB of node "F" or an adj-SID of
> node "F", then node "S" applies the behavior described in section 5.3.1 o=
r
> section 5.3.2, respectively
>
> The bottom line is that there is no need for any peeking into the label
> stack. Just inspect the new top label
>

=E2=80=8BHow is the MPLS data plane in a transit node expected to be progra=
mmed to
make this work?

Regards,
Muthu=E2=80=8B



> Thanks
>
> Ahmed
>
>
> On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
>
> My understanding is that draft wants to provide a solution for the proble=
m
> where the active segment is a prefix/adjacency segment of the neighbor an=
d
> the neighbor fails. A solution to this is possible only at a node that is
> enforcing the SR policy (consisting of the segment list). For a transit
> node, its data plane would have to peek into the label stack and determin=
e
> the type of the segment/label following the active segment and act
> accordingly, which is not inline with the SR architecture which requires =
SR
> to work 'as is' on traditional MPLS data plane
>
> =E2=80=8B Muthu=E2=80=8B
>
> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein <vinesasha@yahoo.co=
m
> > wrote:
>
>> Muthu and all,
>> I do not see how the draft in quesrion us related to "SR Policy".
>>
>> From my POV its scope is a SR LSP comprised of multiple Node SIDs within
>> a single IGP domain, and it provides local fast protection against failu=
re
>> of a node that terminates one of the segments comprising this LSP.
>> Pritection action is performed by the penultimate node.
>>
>> My 2c.
>>
>> Sent from Yahoo Mail on Android
>> <https://overview.mail.yahoo.com/mobile/?.src=3DAndroid>
>>
>> On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>> <muthu.arul@gmail.com> wrote:
>> Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>> protecting SR policy midpoints against node failure for the case where t=
he
>> active segment is the prefix or adjacency segment of a neighbor.
>>
>> I believe the steps described in the procedure is applicable only for a
>> node steering packets into the SR policy. This could be an ingress PE
>> steering IP packets into a SR-TE tunnel or an intermediate node steering
>> labeled packets received with a BSID into a SR-TE tunnel identified by t=
hat
>> BSID.
>>
>> A transit node that has no idea about the SR policy itself is not
>> expected to perform the procedure described in that section.
>>
>> Is my understanding correct?
>>
>> Regards,
>> Muthu
>> _______________________________________________
>> rtgwg mailing list
>> rtgwg@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtgwg
>>
>>
>
>
> _______________________________________________
> rtgwg mailing listrtgwg@ietf.orghttps://www.ietf.org/mailman/listinfo/rtg=
wg
>
>
>

--001a113eba3cd662b7055f0dde4e
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:arial,he=
lvetica,sans-serif;font-size:small"><span style=3D"font-family:arial,sans-s=
erif">On Tue, Nov 28, 2017 at 5:34 PM, Ahmed Bashandy (bashandy) </span><sp=
an dir=3D"ltr" style=3D"font-family:arial,sans-serif">&lt;<a href=3D"mailto=
:bashandy@cisco.com" target=3D"_blank">bashandy@cisco.com</a>&gt;</span><sp=
an style=3D"font-family:arial,sans-serif"> wrote:</span><br></div><div clas=
s=3D"gmail_extra"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Hi,<br>
    <br>
    The behavior described in section 5.3 is clear: <br>
    - The top label of incoming packet to node &quot;S&quot; is either a pr=
efix
    SID owned by node &quot;F&quot; or an adjacency SID for (S,F)<br>
    - If the link from node &quot;S&quot; to node &quot;F&quot; is up, then=
 the normal
    behavior for node &quot;S&quot; is to apply penultimate hop popping (PH=
P).
    HEnce node &quot;S&quot;=C2=A0 *pops* the top label and sends the packe=
t to node
    &quot;F&quot;<br>
    - But if the link (S,F) is down and &quot;S&quot; is configured to do n=
ode
    protection, then node &quot;S&quot; will still pop the top label. This =
will
    promote the label right underneath the incoming label to become the
    *top* label. Hence there is no need to peek into the label stack<br></d=
iv></blockquote><div><br></div><div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8BWhat if the=
 new top label is a BSID assigned from the SRLB of node F or a BGP-LU or a =
VPN label assigned by node F?=E2=80=8B</div></div><div>=C2=A0</div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex"><div bgcolor=3D"#FFFFFF" text=3D"#000000">
    - In a link-state envirnoment, node &quot;S&quot; knows the SRGB of nod=
e &quot;F&quot;
    as well as all adjacency SIDs of node &quot;F&quot;. Hence it can now c=
ompare
    the new top label against the SRGB or the list of adj-SIDs of the
    node &quot;F&quot;<br></div></blockquote><div><br></div><div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">=E2=80=8BWhat does &quot;it&quot; stand for in &quot;it can now co=
mpare&quot;?=C2=A0=C2=A0</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gm=
ail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">=E2=80=8BFor the control plane to be able to compare it also needs to be=
 imposing the SR policy as I said earlier.=C2=A0</div><div class=3D"gmail_d=
efault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><b=
r></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small">Or is the MPLS data plane expected to do such a =
comparison on the fly?</div></div><div>=C2=A0</div><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><div bgcolor=3D"#FFFFFF" text=3D"#000000">
    - If the new top label is within the SRGB of node &quot;F&quot; or an a=
dj-SID
    of node &quot;F&quot;, then node &quot;S&quot; applies the behavior des=
cribed in section
    5.3.1 or section 5.3.2, respectively<br>
    <br>
    The bottom line is that there is no need for any peeking into the
    label stack. Just inspect the new top label<br></div></blockquote><div>=
<br></div><div><div class=3D"gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small">=E2=80=8BHow is the MPLS data plane in a =
transit node expected to be programmed to make this work?</div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;font-size:small">Regards,</div><div class=3D"gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Muth=
u=E2=80=8B</div><br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><=
div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Thanks<span class=3D"HOEnZb"><font color=3D"#888888"><br>
    <br>
    Ahmed</font></span><div><div class=3D"h5"><br>
    <br>
    <div class=3D"m_-8406801806101366794moz-cite-prefix">On 11/23/2017 5:04=
 AM, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div>
          <div><font face=3D"arial, helvetica,
              sans-serif">My understanding is that draft wants to
              provide a solution for the problem where the active
              segment is a prefix/adjacency segment of the neighbor and
              the neighbor fails. A solution to this is possible only at
              a node that is enforcing the SR policy (consisting of the
              segment list).=C2=A0</font><span style=3D"font-family:arial,h=
elvetica,sans-serif">For a
              transit node, its data plane would have to peek into the
              label stack and determine the type of the segment/label
              following the active segment and act accordingly, which is
              not inline with the SR architecture which requires SR to
              work &#39;as is&#39; on traditional MPLS data plane</span></d=
iv>
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all"><br>
          </div>
        </div>
        <div class=3D"gmail_extra">
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">=E2=80=8B
            Muthu=E2=80=8B</div>
          <br>
          <div class=3D"gmail_quote">On Wed, Nov 22, 2017 at 8:22 PM,
            Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:vi=
nesasha@yahoo.com" target=3D"_blank">vinesasha@yahoo.com</a>&gt;</span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Muthu and all=
,
              <div id=3D"m_-8406801806101366794gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362077836">I
                do not see how the draft in quesrion us related to &quot;SR
                Policy&quot;.</div>
              <div id=3D"m_-8406801806101366794gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362111884"><br>
              </div>
              <div id=3D"m_-8406801806101366794gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362112091">From
                my POV its scope is a SR LSP comprised of multiple Node
                SIDs within a single IGP domain, and it provides local
                fast protection against failure of a node that
                terminates one of the segments comprising this LSP.
                Pritection action is performed by the penultimate node.</di=
v>
              <div id=3D"m_-8406801806101366794gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362349834"><br>
              </div>
              <div id=3D"m_-8406801806101366794gmail-m_-4932204748884570604=
yMail_cursorElementTracker_1511362350059">My
                2c.<br>
                <br>
                <div id=3D"m_-8406801806101366794gmail-m_-49322047488845706=
04ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com/mobil=
e/?.src=3DAndroid" target=3D"_blank">Sent from Yahoo Mail on Android</a></d=
iv>
                <br>
                <blockquote style=3D"margin:0px 0px 20px">
                  <div>
                    <div class=3D"m_-8406801806101366794gmail-h5">
                      <div style=3D"font-family:Roboto,sans-serif;color:rgb=
(109,0,246)">
                        <div>On Wed, Nov 22, 2017 at 3:27, Muthu Arul
                          Mozhi Perumal</div>
                        <div>&lt;<a href=3D"mailto:muthu.arul@gmail.com" ta=
rget=3D"_blank">muthu.arul@gmail.com</a>&gt;
                          wrote:</div>
                      </div>
                    </div>
                  </div>
                  <div style=3D"padding:10px 0px 0px 20px;margin:10px 0px 0=
px;border-left:1px solid rgb(109,0,246)">
                    <div>
                      <div class=3D"m_-8406801806101366794gmail-h5">
                        <div id=3D"m_-8406801806101366794gmail-m_-493220474=
8884570604yiv2858571294">
                          <div dir=3D"ltr">
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Section
                              5.3 of=C2=A0draft-bashandy-rtgwg-segmen<wbr>t=
-routing-ti-lfa
                              describes protecting SR policy midpoints
                              against node failure for the case where
                              the active segment is the prefix or
                              adjacency segment of a neighbor.</div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">I believe
                              the steps described in the procedure is
                              applicable only for a node steering
                              packets into the SR policy. This could be
                              an ingress PE steering IP packets into a
                              SR-TE tunnel or an intermediate node
                              steering labeled packets received with a
                              BSID into a SR-TE tunnel identified by
                              that BSID.</div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">A transit
                              node that has no idea about the SR policy
                              itself is not expected to perform the
                              procedure described in that section.</div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Is my
                              understanding correct?</div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small"><br>
                            </div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Regards,</div>
                            <div class=3D"m_-8406801806101366794gmail-m_-49=
32204748884570604yiv2858571294gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:small">Muthu</div>
                          </div>
                        </div>
                      </div>
                    </div>
                    ______________________________<wbr>_________________<br=
>
                    rtgwg mailing list<br>
                    <a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtg=
wg@ietf.org</a><br>
                    <a href=3D"https://www.ietf.org/mailman/listinfo/rtgwg"=
 target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/rtgwg</a><br>
                  </div>
                </blockquote>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
      </div>
      <br>
      <fieldset class=3D"m_-8406801806101366794mimeAttachmentHeader"></fiel=
dset>
      <br>
      <pre>______________________________<wbr>_________________
rtgwg mailing list
<a class=3D"m_-8406801806101366794moz-txt-link-abbreviated" href=3D"mailto:=
rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>
<a class=3D"m_-8406801806101366794moz-txt-link-freetext" href=3D"https://ww=
w.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">https://www.ietf.org/m=
ailman/<wbr>listinfo/rtgwg</a>
</pre>
    </blockquote>
    <br>
  </div></div></div>

</blockquote></div><br></div></div>

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Date: Tue, 28 Nov 2017 08:58:17 -0800
From: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Thanks for the the feedback

The node "S" knows the SRGB and the adj-SIDs of the  neighboring node 
"F". Hence if the new top label is not within these two sets, then the 
node "S" will always be able to know that the node that failed is NOT a 
midpoint but rather an egress point failure

I will add a statement in the document to explain how a node can 
determine that a failure is a midpoint failure. I will also add a 
statement to indicate that if the node determines that the failure is 
not a midpoint failure then it may apply other protection techniques 
that are beyond the scope of this document or simply drop the packet and 
wait for normal protocol conversion.

Ahmed

On 11/28/2017 6:38 AM, Robert Raszuk wrote:
> Hi Ahmed,
>
> > - In a link-state envirnoment, node "S" knows the SRGB of node "F" as 
> well as all adjacency SIDs of node "F"
>
> What you say is all true, but the way I read the question of this 
> thread seems to be what happens in the cases where node S has no clue 
> of the new top label. Say it was controller imposed EPE label or worse 
> it is a VPN label.
>
> In the former EPE case the packet could still be "rescued" by picking 
> into IP header. After all EPE is just an optimization.
>
> However in the latter case where we are carrying L2 or L3 VPNs packet 
> header after the label stack may not help or may be even a security 
> issue if node S would start to make routing decision in global RIB 
> based on customer's space.
>
> So I think the point to document is what is the expected behavior of S 
> node in case of new top label is unknown. It is ok to say drop it, but 
> I think it needs to be clearly stated.
> Best,
> Robert
>
>
> On Tue, Nov 28, 2017 at 1:04 PM, Ahmed Bashandy (bashandy) 
> <bashandy@cisco.com <mailto:bashandy@cisco.com>> wrote:
>
>     Hi,
>
>     The behavior described in section 5.3 is clear:
>     - The top label of incoming packet to node "S" is either a prefix
>     SID owned by node "F" or an adjacency SID for (S,F)
>     - If the link from node "S" to node "F" is up, then the normal
>     behavior for node "S" is to apply penultimate hop popping (PHP).
>     HEnce node "S"  *pops* the top label and sends the packet to node "F"
>     - But if the link (S,F) is down and "S" is configured to do node
>     protection, then node "S" will still pop the top label. This will
>     promote the label right underneath the incoming label to become
>     the *top* label. Hence there is no need to peek into the label stack
>     - In a link-state envirnoment, node "S" knows the SRGB of node "F"
>     as well as all adjacency SIDs of node "F". Hence it can now
>     compare the new top label against the SRGB or the list of adj-SIDs
>     of the node "F"
>     - If the new top label is within the SRGB of node "F" or an
>     adj-SID of node "F", then node "S" applies the behavior described
>     in section 5.3.1 or section 5.3.2, respectively
>
>     The bottom line is that there is no need for any peeking into the
>     label stack. Just inspect the new top label
>
>     Thanks
>
>     Ahmed
>
>
>     On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
>>     My understanding is that draft wants to provide a solution for
>>     the problem where the active segment is a prefix/adjacency
>>     segment of the neighbor and the neighbor fails. A solution to
>>     this is possible only at a node that is enforcing the SR policy
>>     (consisting of the segment list). For a transit node, its data
>>     plane would have to peek into the label stack and determine the
>>     type of the segment/label following the active segment and act
>>     accordingly, which is not inline with the SR architecture which
>>     requires SR to work 'as is' on traditional MPLS data plane
>>
>>     ​ Muthu​
>>
>>     On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein
>>     <vinesasha@yahoo.com <mailto:vinesasha@yahoo.com>> wrote:
>>
>>         Muthu and all,
>>         I do not see how the draft in quesrion us related to "SR Policy".
>>
>>         From my POV its scope is a SR LSP comprised of multiple Node
>>         SIDs within a single IGP domain, and it provides local fast
>>         protection against failure of a node that terminates one of
>>         the segments comprising this LSP. Pritection action is
>>         performed by the penultimate node.
>>
>>         My 2c.
>>
>>         Sent from Yahoo Mail on Android
>>         <https://overview.mail.yahoo.com/mobile/?.src=Android>
>>
>>             On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>>             <muthu.arul@gmail.com <mailto:muthu.arul@gmail.com>> wrote:
>>             Section 5.3
>>             of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>>             protecting SR policy midpoints against node failure for
>>             the case where the active segment is the prefix or
>>             adjacency segment of a neighbor.
>>
>>             I believe the steps described in the procedure is
>>             applicable only for a node steering packets into the SR
>>             policy. This could be an ingress PE steering IP packets
>>             into a SR-TE tunnel or an intermediate node steering
>>             labeled packets received with a BSID into a SR-TE tunnel
>>             identified by that BSID.
>>
>>             A transit node that has no idea about the SR policy
>>             itself is not expected to perform the procedure described
>>             in that section.
>>
>>             Is my understanding correct?
>>
>>             Regards,
>>             Muthu
>>             _______________________________________________
>>             rtgwg mailing list
>>             rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>>             https://www.ietf.org/mailman/listinfo/rtgwg
>>             <https://www.ietf.org/mailman/listinfo/rtgwg>
>>
>>
>>
>>
>>     _______________________________________________
>>     rtgwg mailing list
>>     rtgwg@ietf.org  <mailto:rtgwg@ietf.org>
>>     https://www.ietf.org/mailman/listinfo/rtgwg  <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>
>     _______________________________________________
>     rtgwg mailing list
>     rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>     https://www.ietf.org/mailman/listinfo/rtgwg
>     <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>


--------------090905030708060800050704
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<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
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    Thanks for the the feedback<br>
    <br>
    The node "S" knows the SRGB and the adj-SIDs of the  neighboring
    node "F". Hence if the new top label is not within these two sets,
    then the node "S" will always be able to know that the node that
    failed is NOT a midpoint but rather an egress point failure<br>
    <br>
    I will add a statement in the document to explain how a node can
    determine that a failure is a midpoint failure. I will also add a
    statement to indicate that if the node determines that the failure
    is not a midpoint failure then it may apply other protection
    techniques that are beyond the scope of this document or simply drop
    the packet and wait for normal protocol conversion.<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 11/28/2017 6:38 AM, Robert Raszuk
      wrote:<br>
    </div>
    <blockquote
cite="mid:CA+b+ER=saccjdB6+aKp+gObe97P7UWOtKTd3GT1eXb9vG8ewag@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Hi
          Ahmed,</div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px">&gt; -
            In a link-state envirnoment, node "S" knows the SRGB of node
            "F" as well as all adjacency SIDs of node "F"</span><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px"><br>
          </span></div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px">What
            you say is all true, but the way I read the question of this
            thread seems to be what happens in the cases where node S
            has no clue of the new top label. Say it was controller
            imposed EPE label or worse it is a VPN label. <br>
          </span></div>
      </div>
    </blockquote>
    <blockquote
cite="mid:CA+b+ER=saccjdB6+aKp+gObe97P7UWOtKTd3GT1eXb9vG8ewag@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px"><br>
          </span></div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px">In the
            former EPE case the packet could still be "rescued" by
            picking into IP header. After all EPE is just an
            optimization. </span></div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px"><br>
          </span></div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px">However
            in the latter case where we are carrying L2 or L3 VPNs
            packet header after the label stack may not help or may be
            even a security issue if node S would start to make routing
            decision in global RIB based on customer's space. </span></div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif;font-size:12.8px"><br>
          </span></div>
        <div class="gmail_default" style=""><span
            style="font-size:12.8px">So I think the point to document is
            what is the expected behavior of S node in case of new top
            label is unknown. It is ok to say drop it, but I think it
            needs to be clearly stated. <br>
          </span></div>
      </div>
    </blockquote>
    <blockquote
cite="mid:CA+b+ER=saccjdB6+aKp+gObe97P7UWOtKTd3GT1eXb9vG8ewag@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_default" style=""><span
            style="font-size:12.8px">Best,</span></div>
        <div class="gmail_default" style=""><span
            style="font-size:12.8px">Robert</span></div>
        <div class="gmail_default" style=""><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Tue, Nov 28, 2017 at 1:04 PM, Ahmed
          Bashandy (bashandy) <span dir="ltr">&lt;<a
              moz-do-not-send="true" href="mailto:bashandy@cisco.com"
              target="_blank">bashandy@cisco.com</a>&gt;</span> wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> Hi,<br>
              <br>
              The behavior described in section 5.3 is clear: <br>
              - The top label of incoming packet to node "S" is either a
              prefix SID owned by node "F" or an adjacency SID for (S,F)<br>
              - If the link from node "S" to node "F" is up, then the
              normal behavior for node "S" is to apply penultimate hop
              popping (PHP). HEnce node "S"  *pops* the top label and
              sends the packet to node "F"<br>
              - But if the link (S,F) is down and "S" is configured to
              do node protection, then node "S" will still pop the top
              label. This will promote the label right underneath the
              incoming label to become the *top* label. Hence there is
              no need to peek into the label stack<br>
              - In a link-state envirnoment, node "S" knows the SRGB of
              node "F" as well as all adjacency SIDs of node "F". Hence
              it can now compare the new top label against the SRGB or
              the list of adj-SIDs of the node "F"<br>
              - If the new top label is within the SRGB of node "F" or
              an adj-SID of node "F", then node "S" applies the behavior
              described in section 5.3.1 or section 5.3.2, respectively<br>
              <br>
              The bottom line is that there is no need for any peeking
              into the label stack. Just inspect the new top label<br>
              <br>
              Thanks<span class="HOEnZb"><font color="#888888"><br>
                  <br>
                  Ahmed</font></span>
              <div>
                <div class="h5"><br>
                  <br>
                  <div class="m_-3270397455230933547moz-cite-prefix">On
                    11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:<br>
                  </div>
                  <blockquote type="cite">
                    <div dir="ltr">
                      <div class="gmail_default">
                        <div class="gmail_default"><font face="arial,
                            helvetica, sans-serif">My understanding is
                            that draft wants to provide a solution for
                            the problem where the active segment is a
                            prefix/adjacency segment of the neighbor and
                            the neighbor fails. A solution to this is
                            possible only at a node that is enforcing
                            the SR policy (consisting of the segment
                            list). </font><span
                            style="font-family:arial,helvetica,sans-serif">For
                            a transit node, its data plane would have to
                            peek into the label stack and determine the
                            type of the segment/label following the
                            active segment and act accordingly, which is
                            not inline with the SR architecture which
                            requires SR to work 'as is' on traditional
                            MPLS data plane</span></div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                        </div>
                      </div>
                      <div class="gmail_extra">
                        <div class="gmail_default"
                          style="font-family:arial,helvetica,sans-serif;font-size:small">​
                          Muthu​</div>
                        <br>
                        <div class="gmail_quote">On Wed, Nov 22, 2017 at
                          8:22 PM, Alexander Vainshtein <span dir="ltr">&lt;<a
                              moz-do-not-send="true"
                              href="mailto:vinesasha@yahoo.com"
                              target="_blank">vinesasha@yahoo.com</a>&gt;</span>
                          wrote:<br>
                          <blockquote class="gmail_quote"
                            style="margin:0px 0px 0px
                            0.8ex;border-left:1px solid
                            rgb(204,204,204);padding-left:1ex">Muthu and
                            all,
                            <div
id="m_-3270397455230933547gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362077836">I
                              do not see how the draft in quesrion us
                              related to "SR Policy".</div>
                            <div
id="m_-3270397455230933547gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362111884"><br>
                            </div>
                            <div
id="m_-3270397455230933547gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362112091">From

                              my POV its scope is a SR LSP comprised of
                              multiple Node SIDs within a single IGP
                              domain, and it provides local fast
                              protection against failure of a node that
                              terminates one of the segments comprising
                              this LSP. Pritection action is performed
                              by the penultimate node.</div>
                            <div
id="m_-3270397455230933547gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362349834"><br>
                            </div>
                            <div
id="m_-3270397455230933547gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362350059">My

                              2c.<br>
                              <br>
                              <div
id="m_-3270397455230933547gmail-m_-4932204748884570604ymail_android_signature"><a
                                  moz-do-not-send="true"
                                  href="https://overview.mail.yahoo.com/mobile/?.src=Android"
                                  target="_blank">Sent from Yahoo Mail
                                  on Android</a></div>
                              <br>
                              <blockquote style="margin:0px 0px 20px">
                                <div>
                                  <div
                                    class="m_-3270397455230933547gmail-h5">
                                    <div
                                      style="font-family:Roboto,sans-serif;color:rgb(109,0,246)">
                                      <div>On Wed, Nov 22, 2017 at 3:27,
                                        Muthu Arul Mozhi Perumal</div>
                                      <div>&lt;<a moz-do-not-send="true"
href="mailto:muthu.arul@gmail.com" target="_blank">muthu.arul@gmail.com</a>&gt;

                                        wrote:</div>
                                    </div>
                                  </div>
                                </div>
                                <div style="padding:10px 0px 0px
                                  20px;margin:10px 0px
                                  0px;border-left:1px solid
                                  rgb(109,0,246)">
                                  <div>
                                    <div
                                      class="m_-3270397455230933547gmail-h5">
                                      <div
                                        id="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294">
                                        <div dir="ltr">
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Section
                                            5.3
                                            of draft-bashandy-rtgwg-segmen<wbr>t-routing-ti-lfa

                                            describes protecting SR
                                            policy midpoints against
                                            node failure for the case
                                            where the active segment is
                                            the prefix or adjacency
                                            segment of a neighbor.</div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">I believe
                                            the steps described in the
                                            procedure is applicable only
                                            for a node steering packets
                                            into the SR policy. This
                                            could be an ingress PE
                                            steering IP packets into a
                                            SR-TE tunnel or an
                                            intermediate node steering
                                            labeled packets received
                                            with a BSID into a SR-TE
                                            tunnel identified by that
                                            BSID.</div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">A transit
                                            node that has no idea about
                                            the SR policy itself is not
                                            expected to perform the
                                            procedure described in that
                                            section.</div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Is my
                                            understanding correct?</div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
                                          <div
class="m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div>
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                  ______________________________<wbr>_________________<br>
                                  rtgwg mailing list<br>
                                  <a moz-do-not-send="true"
                                    href="mailto:rtgwg@ietf.org"
                                    target="_blank">rtgwg@ietf.org</a><br>
                                  <a moz-do-not-send="true"
                                    href="https://www.ietf.org/mailman/listinfo/rtgwg"
                                    target="_blank">https://www.ietf.org/mailman/l<wbr>istinfo/rtgwg</a><br>
                                </div>
                              </blockquote>
                            </div>
                          </blockquote>
                        </div>
                        <br>
                      </div>
                    </div>
                    <br>
                    <fieldset
                      class="m_-3270397455230933547mimeAttachmentHeader"></fieldset>
                    <br>
                    <pre>______________________________<wbr>_________________
rtgwg mailing list
<a moz-do-not-send="true" class="m_-3270397455230933547moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org" target="_blank">rtgwg@ietf.org</a>
<a moz-do-not-send="true" class="m_-3270397455230933547moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/rtgwg" target="_blank">https://www.ietf.org/mailman/<wbr>listinfo/rtgwg</a>
</pre>
                  </blockquote>
                  <br>
                </div>
              </div>
            </div>
            <br>
            ______________________________<wbr>_________________<br>
            rtgwg mailing list<br>
            <a moz-do-not-send="true" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br>
            <a moz-do-not-send="true"
              href="https://www.ietf.org/mailman/listinfo/rtgwg"
              rel="noreferrer" target="_blank">https://www.ietf.org/mailman/<wbr>listinfo/rtgwg</a><br>
            <br>
          </blockquote>
        </div>
        <br>
      </div>
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Date: Tue, 28 Nov 2017 16:58:52 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "muthu.arul@gmail.com" <muthu.arul@gmail.com>,  "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
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References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Muthu,Please take a look at draft-hegde-spring-node-protection-for-sr-te-paths that provides accurate descriprion of the requured DP behavior in the standard terms (context-specifuc label spaces and context-identifying labels).
My 2c.
Sent from Yahoo Mail on Android 
 
  On Tue, Nov 28, 2017 at 10:54, Muthu Arul Mozhi Perumal<muthu.arul@gmail.com> wrote:   _______________________________________________
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Muthu,<div id=3D"yMail_cursorElementTracker_1511888177620">Please take a lo=
ok at draft-hegde-spring-node-protection-for-sr-te-paths that provides accu=
rate descriprion of the requured DP behavior in the standard terms (context=
-specifuc label spaces and context-identifying labels).</div><div id=3D"yMa=
il_cursorElementTracker_1511888291877"><br></div><div id=3D"yMail_cursorEle=
mentTracker_1511888320861">My 2c.</div><div id=3D"yMail_cursorElementTracke=
r_1511888292023"><br><div id=3D"ymail_android_signature"><a href=3D"https:/=
/overview.mail.yahoo.com/mobile/?.src=3DAndroid">Sent from Yahoo Mail on An=
droid</a></div> <br> <blockquote style=3D"margin: 0 0 20px 0;"> <div style=
=3D"font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Tue, Nov 28, 2=
017 at 10:54, Muthu Arul Mozhi Perumal</div><div>&lt;muthu.arul@gmail.com&g=
t; wrote:</div> </div> <div style=3D"padding: 10px 0 0 20px; margin: 10px 0=
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From nobody Tue Nov 28 09:01:58 2017
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Date: Tue, 28 Nov 2017 09:01:51 -0800
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To: Stewart Bryant <stewart.bryant@gmail.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <8948158b-6fbe-4458-476a-ea1f8f34ee6c@gmail.com>
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Stewart,

I am sure you are aware that ISIS and OSPF adj-SID advertisements 
indicate whether an adj-SID is protected or not. If the ingress router 
decided to use a protected adj-SID for a policy, then the protection of 
such adj-SID is within the policy.

Ahmed

On 11/28/2017 7:15 AM, Stewart Bryant wrote:
>
>
> On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
>>
>> - The top label of incoming packet to node "S" is either a prefix SID 
>> owned by node "F" or an adjacency SID for (S,F)
>
> If it is an adjacency SID for (S,F) then you are violating the 
> original intent of the ingress PE which was to send the packet along 
> the path S->F. I really don't think you can blindly repair such a 
> packet since to do so violates the policy applied to the packet. You 
> have to do a policy check, and you have to make sure that the packet 
> is not subject to ECMP along the repair path since ECMP avoidance 
> might have been the intent of using the SR Adjacency in the first place.
>
> - Stewart


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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <1776763839.4755621.1511885056113@mail.yahoo.com>
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See inline

Ahmed

On 11/28/2017 8:04 AM, Alexander Vainshtein wrote:
> Ahmed and all,
> Two points:
> 1. From my POV your description of forwarding behavior when the link 
> S-->F fails is incomplete: the top label in the stack may be poppoed, 
> but it is not "forgotten", and the next exposed label is looked up by 
> S in the context label space that is F-specific. I.e., if S has two 
> downstream neighbors, F and G, and both links S-->F and S-->G fail, 
> lookup of the next exposed label for packets with ToS being S label 
> for F and S label for G will yield different results.
>
#Ahmed: I do not understand what is not clear. The draft says in 
sections 5.3.1 and 5.3.2 "Confirm that the next segment is in the SRGB 
of F" and "the active segment is a prefix SID for a neighbor F" and 
"Confirm that the next segment is an adjacency SID of F".

In my previous email I said 'node "S" knows the SRGB of node "F" as well 
as all adjacency SIDs of node "F"'

So it is quite clear that the checks done on the new top label is within 
the context of the next-hop "F"

> 2. From my POV draft-hegde-spring-node-protection-for-sr-te-paths 
> provides roughly equjvalent behavior, but it is much more clear when 
> it comes to describibg the DP mechanisms involved. (IMHO and FWIW 
> calling a spae by its name is greatly preferable in most cases.)
#Ahmed: thanks for pointing out that 
draft-hegde-spring-node-protection-for-sr-te-paths overlaps with 
draft-bashandy-rtgwg-segment-routing-ti-lfa :)

>
> My 2c
>
>
> Sent from Yahoo Mail on Android 
> <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
>     On Tue, Nov 28, 2017 at 6:04, Ahmed Bashandy (bashandy)
>     <bashandy@cisco.com> wrote:
>     _______________________________________________
>     rtgwg mailing list
>     rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>     https://www.ietf.org/mailman/listinfo/rtgwg
>


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<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    See inline<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 11/28/2017 8:04 AM, Alexander
      Vainshtein wrote:<br>
    </div>
    <blockquote
      cite="mid:1776763839.4755621.1511885056113@mail.yahoo.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      Ahmed and all,
      <div id="yMail_cursorElementTracker_1511884139259">Two points:</div>
      <div id="yMail_cursorElementTracker_1511884149057">1. From my POV
        your description of forwarding behavior when the link S--&gt;F
        fails is incomplete: the top label in the stack may be poppoed,
        but it is not "forgotten", and the next exposed label is looked
        up by S in the context label space that is F-specific. I.e., if
        S has two downstream neighbors, F and G, and both links S--&gt;F
        and S--&gt;G fail, lookup of the next exposed label for packets
        with ToS being S label for F and S label for G will yield
        different results.</div>
      <div id="yMail_cursorElementTracker_1511884622902"><br>
      </div>
    </blockquote>
    #Ahmed: I do not understand what is not clear. The draft says in
    sections 5.3.1 and 5.3.2 "Confirm that the next segment is in the
    SRGB of F" and "the active segment is a prefix SID for a neighbor F"
    and "Confirm that the next segment is an adjacency SID of F". <br>
    <br>
    In my previous email I said 'node "S" knows the SRGB of node "F" as
    well as all adjacency SIDs of node "F"' <br>
    <br>
    So it is quite clear that the checks done on the new top label is
    within the context of the next-hop "F"<br>
    <br>
    <blockquote
      cite="mid:1776763839.4755621.1511885056113@mail.yahoo.com"
      type="cite">
      <div id="yMail_cursorElementTracker_1511884624096">2. From my POV
        draft-hegde-spring-node-protection-for-sr-te-paths provides
        roughly equjvalent behavior, but it is much more clear when it
        comes to describibg the DP mechanisms involved. (IMHO and FWIW
        calling a spae by its name is greatly preferable in most cases.)</div>
    </blockquote>
    #Ahmed: thanks for pointing out that
    draft-hegde-spring-node-protection-for-sr-te-paths overlaps with
    draft-bashandy-rtgwg-segment-routing-ti-lfa :)<br>
    <br>
    <blockquote
      cite="mid:1776763839.4755621.1511885056113@mail.yahoo.com"
      type="cite">
      <div id="yMail_cursorElementTracker_1511885039917"><br>
      </div>
      <div id="yMail_cursorElementTracker_1511885040531">My 2c<br>
        <div id="yMail_cursorElementTracker_1511883906072"><br>
        </div>
        <div id="yMail_cursorElementTracker_1511883916905"><br>
          <div id="ymail_android_signature"><a moz-do-not-send="true"
              href="https://overview.mail.yahoo.com/mobile/?.src=Android">Sent
              from Yahoo Mail on Android</a></div>
          <br>
          <blockquote style="margin: 0 0 20px 0;">
            <div style="font-family:Roboto, sans-serif; color:#6D00F6;">
              <div>On Tue, Nov 28, 2017 at 6:04, Ahmed Bashandy
                (bashandy)</div>
              <div><a class="moz-txt-link-rfc2396E" href="mailto:bashandy@cisco.com">&lt;bashandy@cisco.com&gt;</a> wrote:</div>
            </div>
            <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0;
              border-left: 1px solid #6D00F6;">
              _______________________________________________<br
                clear="none">
              rtgwg mailing list<br clear="none">
              <a moz-do-not-send="true" shape="rect"
                ymailto="mailto:rtgwg@ietf.org"
                href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br
                clear="none">
              <a moz-do-not-send="true" shape="rect"
                href="https://www.ietf.org/mailman/listinfo/rtgwg"
                target="_blank"
                id="yMail_cursorElementTracker_1511884215556">https://www.ietf.org/mailman/listinfo/rtgwg</a><br
                clear="none">
            </div>
          </blockquote>
        </div>
      </div>
    </blockquote>
    <br>
  </body>
</html>

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Date: Tue, 28 Nov 2017 17:15:50 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "bashandy@cisco.com" <bashandy@cisco.com>,  Stewart Bryant <stewart.bryant@gmail.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>,  "sasha@axerra.com" <sasha@axerra.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
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References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <8948158b-6fbe-4458-476a-ea1f8f34ee6c@gmail.com> <5A1D967F.4020905@cisco.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Ahmed,I believe that the so-called protected Adj-SID simply means that if t=
he link that it represents fails, it can be replaced with the Node-SID of t=
he node at the remote end if the adjacency.=C2=A0It does not help at all if=
 the downstream node fails.

Sent from Yahoo Mail on Android=20
=20
  On Tue, Nov 28, 2017 at 11:02, Ahmed Bashandy (bashandy)<bashandy@cisco.c=
om> wrote:   Stewart,

I am sure you are aware that ISIS and OSPF adj-SID advertisements=20
indicate whether an adj-SID is protected or not. If the ingress router=20
decided to use a protected adj-SID for a policy, then the protection of=20
such adj-SID is within the policy.

Ahmed

On 11/28/2017 7:15 AM, Stewart Bryant wrote:
>
>
> On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
>>
>> - The top label of incoming packet to node "S" is either a prefix SID=20
>> owned by node "F" or an adjacency SID for (S,F)
>
> If it is an adjacency SID for (S,F) then you are violating the=20
> original intent of the ingress PE which was to send the packet along=20
> the path S->F. I really don't think you can blindly repair such a=20
> packet since to do so violates the policy applied to the packet. You=20
> have to do a policy check, and you have to make sure that the packet=20
> is not subject to ECMP along the repair path since ECMP avoidance=20
> might have been the intent of using the SR Adjacency in the first place.
>
> - Stewart

_______________________________________________
rtgwg mailing list
rtgwg@ietf.org
https://www.ietf.org/mailman/listinfo/rtgwg
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Ahmed,<div id=3D"yMail_cursorElementTracker_1511888981950">I believe that t=
he so-called protected Adj-SID simply means that if the link that it repres=
ents fails, it can be replaced with the Node-SID of the node at the remote =
end if the adjacency.&nbsp;</div><div id=3D"yMail_cursorElementTracker_1511=
889306720">It does not help at all if the downstream node fails.<br><br><di=
v id=3D"ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com=
/mobile/?.src=3DAndroid">Sent from Yahoo Mail on Android</a></div> <br> <bl=
ockquote style=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto, s=
ans-serif; color:#6D00F6;"> <div>On Tue, Nov 28, 2017 at 11:02, Ahmed Basha=
ndy (bashandy)</div><div>&lt;bashandy@cisco.com&gt; wrote:</div> </div> <di=
v style=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px sol=
id #6D00F6;"> Stewart,<br clear=3D"none"><br clear=3D"none">I am sure you a=
re aware that ISIS and OSPF adj-SID advertisements <br clear=3D"none">indic=
ate whether an adj-SID is protected or not. If the ingress router <br clear=
=3D"none">decided to use a protected adj-SID for a policy, then the protect=
ion of <br clear=3D"none">such adj-SID is within the policy.<br clear=3D"no=
ne"><br clear=3D"none">Ahmed<br clear=3D"none"><div class=3D"yqt2314934627 =
yQTDBase" id=3D"yqtfd99280"><br clear=3D"none">On 11/28/2017 7:15 AM, Stewa=
rt Bryant wrote:<br clear=3D"none">&gt;<br clear=3D"none">&gt;<br clear=3D"=
none">&gt; On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:<br clear=
=3D"none">&gt;&gt;<br clear=3D"none">&gt;&gt; - The top label of incoming p=
acket to node "S" is either a prefix SID <br clear=3D"none">&gt;&gt; owned =
by node "F" or an adjacency SID for (S,F)<br clear=3D"none">&gt;<br clear=
=3D"none">&gt; If it is an adjacency SID for (S,F) then you are violating t=
he <br clear=3D"none">&gt; original intent of the ingress PE which was to s=
end the packet along <br clear=3D"none">&gt; the path S-&gt;F. I really don=
't think you can blindly repair such a <br clear=3D"none">&gt; packet since=
 to do so violates the policy applied to the packet. You <br clear=3D"none"=
>&gt; have to do a policy check, and you have to make sure that the packet =
<br clear=3D"none">&gt; is not subject to ECMP along the repair path since =
ECMP avoidance <br clear=3D"none">&gt; might have been the intent of using =
the SR Adjacency in the first place.<br clear=3D"none">&gt;<br clear=3D"non=
e">&gt; - Stewart<br clear=3D"none"><br clear=3D"none">____________________=
___________________________<br clear=3D"none">rtgwg mailing list<br clear=
=3D"none"><a shape=3D"rect" ymailto=3D"mailto:rtgwg@ietf.org" href=3D"mailt=
o:rtgwg@ietf.org">rtgwg@ietf.org</a><br clear=3D"none"><a shape=3D"rect" hr=
ef=3D"https://www.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">https:=
//www.ietf.org/mailman/listinfo/rtgwg</a><br clear=3D"none"></div> </div> <=
/blockquote></div>
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
Cc: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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That's good addition to the draft.

My comment is addressed.

Thx,
R.

On Tue, Nov 28, 2017 at 5:58 PM, Ahmed Bashandy (bashandy) <
bashandy@cisco.com> wrote:

> Thanks for the the feedback
>
> The node "S" knows the SRGB and the adj-SIDs of the  neighboring node "F"=
.
> Hence if the new top label is not within these two sets, then the node "S=
"
> will always be able to know that the node that failed is NOT a midpoint b=
ut
> rather an egress point failure
>
> I will add a statement in the document to explain how a node can determin=
e
> that a failure is a midpoint failure. I will also add a statement to
> indicate that if the node determines that the failure is not a midpoint
> failure then it may apply other protection techniques that are beyond the
> scope of this document or simply drop the packet and wait for normal
> protocol conversion.
>
> Ahmed
>
>
> On 11/28/2017 6:38 AM, Robert Raszuk wrote:
>
> Hi Ahmed,
>
> > - In a link-state envirnoment, node "S" knows the SRGB of node "F" as
> well as all adjacency SIDs of node "F"
>
> What you say is all true, but the way I read the question of this thread
> seems to be what happens in the cases where node S has no clue of the new
> top label. Say it was controller imposed EPE label or worse it is a VPN
> label.
>
>
> In the former EPE case the packet could still be "rescued" by picking int=
o
> IP header. After all EPE is just an optimization.
>
> However in the latter case where we are carrying L2 or L3 VPNs packet
> header after the label stack may not help or may be even a security issue
> if node S would start to make routing decision in global RIB based on
> customer's space.
>
> So I think the point to document is what is the expected behavior of S
> node in case of new top label is unknown. It is ok to say drop it, but I
> think it needs to be clearly stated.
>
> Best,
> Robert
>
>
> On Tue, Nov 28, 2017 at 1:04 PM, Ahmed Bashandy (bashandy) <
> bashandy@cisco.com> wrote:
>
>> Hi,
>>
>> The behavior described in section 5.3 is clear:
>> - The top label of incoming packet to node "S" is either a prefix SID
>> owned by node "F" or an adjacency SID for (S,F)
>> - If the link from node "S" to node "F" is up, then the normal behavior
>> for node "S" is to apply penultimate hop popping (PHP). HEnce node "S"
>> *pops* the top label and sends the packet to node "F"
>> - But if the link (S,F) is down and "S" is configured to do node
>> protection, then node "S" will still pop the top label. This will promot=
e
>> the label right underneath the incoming label to become the *top* label.
>> Hence there is no need to peek into the label stack
>> - In a link-state envirnoment, node "S" knows the SRGB of node "F" as
>> well as all adjacency SIDs of node "F". Hence it can now compare the new
>> top label against the SRGB or the list of adj-SIDs of the node "F"
>> - If the new top label is within the SRGB of node "F" or an adj-SID of
>> node "F", then node "S" applies the behavior described in section 5.3.1 =
or
>> section 5.3.2, respectively
>>
>> The bottom line is that there is no need for any peeking into the label
>> stack. Just inspect the new top label
>>
>> Thanks
>>
>> Ahmed
>>
>>
>> On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
>>
>> My understanding is that draft wants to provide a solution for the
>> problem where the active segment is a prefix/adjacency segment of the
>> neighbor and the neighbor fails. A solution to this is possible only at =
a
>> node that is enforcing the SR policy (consisting of the segment list). F=
or
>> a transit node, its data plane would have to peek into the label stack a=
nd
>> determine the type of the segment/label following the active segment and
>> act accordingly, which is not inline with the SR architecture which
>> requires SR to work 'as is' on traditional MPLS data plane
>>
>> =E2=80=8B Muthu=E2=80=8B
>>
>> On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein <
>> vinesasha@yahoo.com> wrote:
>>
>>> Muthu and all,
>>> I do not see how the draft in quesrion us related to "SR Policy".
>>>
>>> From my POV its scope is a SR LSP comprised of multiple Node SIDs withi=
n
>>> a single IGP domain, and it provides local fast protection against fail=
ure
>>> of a node that terminates one of the segments comprising this LSP.
>>> Pritection action is performed by the penultimate node.
>>>
>>> My 2c.
>>>
>>> Sent from Yahoo Mail on Android
>>> <https://overview.mail.yahoo.com/mobile/?.src=3DAndroid>
>>>
>>> On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>>> <muthu.arul@gmail.com> wrote:
>>> Section 5.3 of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>>> protecting SR policy midpoints against node failure for the case where =
the
>>> active segment is the prefix or adjacency segment of a neighbor.
>>>
>>> I believe the steps described in the procedure is applicable only for a
>>> node steering packets into the SR policy. This could be an ingress PE
>>> steering IP packets into a SR-TE tunnel or an intermediate node steerin=
g
>>> labeled packets received with a BSID into a SR-TE tunnel identified by =
that
>>> BSID.
>>>
>>> A transit node that has no idea about the SR policy itself is not
>>> expected to perform the procedure described in that section.
>>>
>>> Is my understanding correct?
>>>
>>> Regards,
>>> Muthu
>>> _______________________________________________
>>> rtgwg mailing list
>>> rtgwg@ietf.org
>>> https://www.ietf.org/mailman/listinfo/rtgwg
>>>
>>>
>>
>>
>> _______________________________________________
>> rtgwg mailing listrtgwg@ietf.orghttps://www.ietf.org/mailman/listinfo/rt=
gwg
>>
>>
>>
>> _______________________________________________
>> rtgwg mailing list
>> rtgwg@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtgwg
>>
>>
>
>

--001a1143816e6fdf25055f0e32ee
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:arial,he=
lvetica,sans-serif;font-size:small">That&#39;s good addition to the draft.=
=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">My comment is a=
ddressed.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:aria=
l,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Thx,</=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">R.</div></div><div class=3D"gmail_extra"><br><div cl=
ass=3D"gmail_quote">On Tue, Nov 28, 2017 at 5:58 PM, Ahmed Bashandy (bashan=
dy) <span dir=3D"ltr">&lt;<a href=3D"mailto:bashandy@cisco.com" target=3D"_=
blank">bashandy@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Thanks for the the feedback<br>
    <br>
    The node &quot;S&quot; knows the SRGB and the adj-SIDs of the=C2=A0 nei=
ghboring
    node &quot;F&quot;. Hence if the new top label is not within these two =
sets,
    then the node &quot;S&quot; will always be able to know that the node t=
hat
    failed is NOT a midpoint but rather an egress point failure<br>
    <br>
    I will add a statement in the document to explain how a node can
    determine that a failure is a midpoint failure. I will also add a
    statement to indicate that if the node determines that the failure
    is not a midpoint failure then it may apply other protection
    techniques that are beyond the scope of this document or simply drop
    the packet and wait for normal protocol conversion.<span class=3D"HOEnZ=
b"><font color=3D"#888888"><br>
    <br>
    Ahmed</font></span><div><div class=3D"h5"><br>
    <br>
    <div class=3D"m_-6610135792829852496moz-cite-prefix">On 11/28/2017 6:38=
 AM, Robert Raszuk
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small">Hi
          Ahmed,</div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><br>
        </div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px">&gt; -
            In a link-state envirnoment, node &quot;S&quot; knows the SRGB =
of node
            &quot;F&quot; as well as all adjacency SIDs of node &quot;F&quo=
t;</span><br>
        </div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px"><br>
          </span></div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px">What
            you say is all true, but the way I read the question of this
            thread seems to be what happens in the cases where node S
            has no clue of the new top label. Say it was controller
            imposed EPE label or worse it is a VPN label. <br>
          </span></div>
      </div>
    </blockquote>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px"><br>
          </span></div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px">In the
            former EPE case the packet could still be &quot;rescued&quot; b=
y
            picking into IP header. After all EPE is just an
            optimization.=C2=A0</span></div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px"><br>
          </span></div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px">However
            in the latter case where we are carrying L2 or L3 VPNs
            packet header after the label stack may not help or may be
            even a security issue if node S would start to make routing
            decision in global RIB based on customer&#39;s space.=C2=A0</sp=
an></div>
        <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif;font-size:small"><span style=3D"font-family:arial,sans-serif;font=
-size:12.8px"><br>
          </span></div>
        <div class=3D"gmail_default"><span style=3D"font-size:12.8px">So I =
think the point to document is
            what is the expected behavior of S node=C2=A0in case of new top
            label is unknown. It is ok to say drop it, but I think it
            needs to be clearly stated. <br>
          </span></div>
      </div>
    </blockquote>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div class=3D"gmail_default"><span style=3D"font-size:12.8px">Best,=
</span></div>
        <div class=3D"gmail_default"><span style=3D"font-size:12.8px">Rober=
t</span></div>
        <div class=3D"gmail_default"><br>
        </div>
      </div>
      <div class=3D"gmail_extra"><br>
        <div class=3D"gmail_quote">On Tue, Nov 28, 2017 at 1:04 PM, Ahmed
          Bashandy (bashandy) <span dir=3D"ltr">&lt;<a href=3D"mailto:basha=
ndy@cisco.com" target=3D"_blank">bashandy@cisco.com</a>&gt;</span> wrote:<b=
r>
          <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor=3D"#FFFFFF" text=3D"#000000"> Hi,<br>
              <br>
              The behavior described in section 5.3 is clear: <br>
              - The top label of incoming packet to node &quot;S&quot; is e=
ither a
              prefix SID owned by node &quot;F&quot; or an adjacency SID fo=
r (S,F)<br>
              - If the link from node &quot;S&quot; to node &quot;F&quot; i=
s up, then the
              normal behavior for node &quot;S&quot; is to apply penultimat=
e hop
              popping (PHP). HEnce node &quot;S&quot;=C2=A0 *pops* the top =
label and
              sends the packet to node &quot;F&quot;<br>
              - But if the link (S,F) is down and &quot;S&quot; is configur=
ed to
              do node protection, then node &quot;S&quot; will still pop th=
e top
              label. This will promote the label right underneath the
              incoming label to become the *top* label. Hence there is
              no need to peek into the label stack<br>
              - In a link-state envirnoment, node &quot;S&quot; knows the S=
RGB of
              node &quot;F&quot; as well as all adjacency SIDs of node &quo=
t;F&quot;. Hence
              it can now compare the new top label against the SRGB or
              the list of adj-SIDs of the node &quot;F&quot;<br>
              - If the new top label is within the SRGB of node &quot;F&quo=
t; or
              an adj-SID of node &quot;F&quot;, then node &quot;S&quot; app=
lies the behavior
              described in section 5.3.1 or section 5.3.2, respectively<br>
              <br>
              The bottom line is that there is no need for any peeking
              into the label stack. Just inspect the new top label<br>
              <br>
              Thanks<span class=3D"m_-6610135792829852496HOEnZb"><font colo=
r=3D"#888888"><br>
                  <br>
                  Ahmed</font></span>
              <div>
                <div class=3D"m_-6610135792829852496h5"><br>
                  <br>
                  <div class=3D"m_-6610135792829852496m_-327039745523093354=
7moz-cite-prefix">On
                    11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:<br>
                  </div>
                  <blockquote type=3D"cite">
                    <div dir=3D"ltr">
                      <div class=3D"gmail_default">
                        <div class=3D"gmail_default"><font face=3D"arial,
                            helvetica, sans-serif">My understanding is
                            that draft wants to provide a solution for
                            the problem where the active segment is a
                            prefix/adjacency segment of the neighbor and
                            the neighbor fails. A solution to this is
                            possible only at a node that is enforcing
                            the SR policy (consisting of the segment
                            list).=C2=A0</font><span style=3D"font-family:a=
rial,helvetica,sans-serif">For
                            a transit node, its data plane would have to
                            peek into the label stack and determine the
                            type of the segment/label following the
                            active segment and act accordingly, which is
                            not inline with the SR architecture which
                            requires SR to work &#39;as is&#39; on traditio=
nal
                            MPLS data plane</span></div>
                        <div style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:small"><br>
                        </div>
                      </div>
                      <div class=3D"gmail_extra">
                        <div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small">=E2=80=8B
                          Muthu=E2=80=8B</div>
                        <br>
                        <div class=3D"gmail_quote">On Wed, Nov 22, 2017 at
                          8:22 PM, Alexander Vainshtein <span dir=3D"ltr">&=
lt;<a href=3D"mailto:vinesasha@yahoo.com" target=3D"_blank">vinesasha@yahoo=
.com</a>&gt;</span>
                          wrote:<br>
                          <blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
>Muthu and
                            all,
                            <div id=3D"m_-6610135792829852496m_-32703974552=
30933547gmail-m_-4932204748884570604yMail_cursorElementTracker_151136207783=
6">I
                              do not see how the draft in quesrion us
                              related to &quot;SR Policy&quot;.</div>
                            <div id=3D"m_-6610135792829852496m_-32703974552=
30933547gmail-m_-4932204748884570604yMail_cursorElementTracker_151136211188=
4"><br>
                            </div>
                            <div id=3D"m_-6610135792829852496m_-32703974552=
30933547gmail-m_-4932204748884570604yMail_cursorElementTracker_151136211209=
1">From

                              my POV its scope is a SR LSP comprised of
                              multiple Node SIDs within a single IGP
                              domain, and it provides local fast
                              protection against failure of a node that
                              terminates one of the segments comprising
                              this LSP. Pritection action is performed
                              by the penultimate node.</div>
                            <div id=3D"m_-6610135792829852496m_-32703974552=
30933547gmail-m_-4932204748884570604yMail_cursorElementTracker_151136234983=
4"><br>
                            </div>
                            <div id=3D"m_-6610135792829852496m_-32703974552=
30933547gmail-m_-4932204748884570604yMail_cursorElementTracker_151136235005=
9">My

                              2c.<br>
                              <br>
                              <div id=3D"m_-6610135792829852496m_-327039745=
5230933547gmail-m_-4932204748884570604ymail_android_signature"><a href=3D"h=
ttps://overview.mail.yahoo.com/mobile/?.src=3DAndroid" target=3D"_blank">Se=
nt from Yahoo Mail
                                  on Android</a></div>
                              <br>
                              <blockquote style=3D"margin:0px 0px 20px">
                                <div>
                                  <div class=3D"m_-6610135792829852496m_-32=
70397455230933547gmail-h5">
                                    <div style=3D"font-family:Roboto,sans-s=
erif;color:rgb(109,0,246)">
                                      <div>On Wed, Nov 22, 2017 at 3:27,
                                        Muthu Arul Mozhi Perumal</div>
                                      <div>&lt;<a href=3D"mailto:muthu.arul=
@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;

                                        wrote:</div>
                                    </div>
                                  </div>
                                </div>
                                <div style=3D"padding:10px 0px 0px 20px;mar=
gin:10px 0px 0px;border-left:1px solid rgb(109,0,246)">
                                  <div>
                                    <div class=3D"m_-6610135792829852496m_-=
3270397455230933547gmail-h5">
                                      <div id=3D"m_-6610135792829852496m_-3=
270397455230933547gmail-m_-4932204748884570604yiv2858571294">
                                        <div dir=3D"ltr">
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Sect=
ion
                                            5.3
                                            of=C2=A0draft-bashandy-rtgwg-se=
gmen<wbr>t-routing-ti-lfa

                                            describes protecting SR
                                            policy midpoints against
                                            node failure for the case
                                            where the active segment is
                                            the prefix or adjacency
                                            segment of a neighbor.</div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">I be=
lieve
                                            the steps described in the
                                            procedure is applicable only
                                            for a node steering packets
                                            into the SR policy. This
                                            could be an ingress PE
                                            steering IP packets into a
                                            SR-TE tunnel or an
                                            intermediate node steering
                                            labeled packets received
                                            with a BSID into a SR-TE
                                            tunnel identified by that
                                            BSID.</div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">A tr=
ansit
                                            node that has no idea about
                                            the SR policy itself is not
                                            expected to perform the
                                            procedure described in that
                                            section.</div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Is m=
y
                                            understanding correct?</div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                          </div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Rega=
rds,</div>
                                          <div class=3D"m_-6610135792829852=
496m_-3270397455230933547gmail-m_-4932204748884570604yiv2858571294gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Muth=
u</div>
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                  ______________________________<wbr>______=
___________<br>
                                  rtgwg mailing list<br>
                                  <a href=3D"mailto:rtgwg@ietf.org" target=
=3D"_blank">rtgwg@ietf.org</a><br>
                                  <a href=3D"https://www.ietf.org/mailman/l=
istinfo/rtgwg" target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo=
/rtgwg</a><br>
                                </div>
                              </blockquote>
                            </div>
                          </blockquote>
                        </div>
                        <br>
                      </div>
                    </div>
                    <br>
                    <fieldset class=3D"m_-6610135792829852496m_-32703974552=
30933547mimeAttachmentHeader"></fieldset>
                    <br>
                    <pre>______________________________<wbr>_______________=
__
rtgwg mailing list
<a class=3D"m_-6610135792829852496m_-3270397455230933547moz-txt-link-abbrev=
iated" href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>
<a class=3D"m_-6610135792829852496m_-3270397455230933547moz-txt-link-freete=
xt" href=3D"https://www.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">=
https://www.ietf.org/mailman/l<wbr>istinfo/rtgwg</a>
</pre>
                  </blockquote>
                  <br>
                </div>
              </div>
            </div>
            <br>
            ______________________________<wbr>_________________<br>
            rtgwg mailing list<br>
            <a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.=
org</a><br>
            <a href=3D"https://www.ietf.org/mailman/listinfo/rtgwg" rel=3D"=
noreferrer" target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/rt=
gwg</a><br>
            <br>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </div></div></div>

</blockquote></div><br></div>

--001a1143816e6fdf25055f0e32ee--


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Date: Tue, 28 Nov 2017 09:25:57 -0800
From: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
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To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "sasha@axerra.com" <sasha@axerra.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com>
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Thanks for the feedback

See inline

Ahmed

On 11/28/2017 8:54 AM, Muthu Arul Mozhi Perumal wrote:
> On Tue, Nov 28, 2017 at 5:34 PM, Ahmed Bashandy (bashandy) 
> <bashandy@cisco.com <mailto:bashandy@cisco.com>>wrote:
>
>     Hi,
>
>     The behavior described in section 5.3 is clear:
>     - The top label of incoming packet to node "S" is either a prefix
>     SID owned by node "F" or an adjacency SID for (S,F)
>     - If the link from node "S" to node "F" is up, then the normal
>     behavior for node "S" is to apply penultimate hop popping (PHP).
>     HEnce node "S"  *pops* the top label and sends the packet to node "F"
>     - But if the link (S,F) is down and "S" is configured to do node
>     protection, then node "S" will still pop the top label. This will
>     promote the label right underneath the incoming label to become
>     the *top* label. Hence there is no need to peek into the label stack
>
>
> ​ What if the new top label is a BSID assigned from the SRLB of node F 
> or a BGP-LU or a VPN label assigned by node F?​
#Ahmed: I just replied to Robert. Let me put it here
The node "S" knows the SRGB and the adj-SIDs of the  neighboring node 
"F". Hence if the new top label is not within these two sets, then the 
node "S" will always be able to know that the node that failed is NOT a 
midpoint.
I will add a statement in the document to explain how a node can 
determine that a failure is a midpoint failure. I will also add a 
statement to indicate that if the node determines that the failure is 
not a midpoint failure then it may apply other protection techniques 
that are beyond the scope of this document or simply drop the packet and 
wait for normal protocol conversion.

>     - In a link-state envirnoment, node "S" knows the SRGB of node "F"
>     as well as all adjacency SIDs of node "F". Hence it can now
>     compare the new top label against the SRGB or the list of adj-SIDs
>     of the node "F"
>
>
> ​ What does "it" stand for in "it can now compare"?
"Ahmed: "It" refers to the node "S"
>
> ​ For the control plane to be able to compare it also needs to be 
> imposing the SR policy as I said earlier.
#Ahmed: There is no control plane comparison.
>
> Or is the MPLS data plane expected to do such a comparison on the fly?
#Ahmed: data plane is expected to do such comparison. It is not that 
difficult. Just make sure you have a good forwarding ASIC :)
>
>     - If the new top label is within the SRGB of node "F" or an
>     adj-SID of node "F", then node "S" applies the behavior described
>     in section 5.3.1 or section 5.3.2, respectively
>
>     The bottom line is that there is no need for any peeking into the
>     label stack. Just inspect the new top label
>
>
> ​ How is the MPLS data plane in a transit node expected to be 
> programmed to make this work?
#Ahmed: Implementation details that should become big problems for good 
forwarding ASICs :)
>
> Regards,
> Muthu ​
>
>     Thanks
>
>     Ahmed
>
>
>     On 11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal wrote:
>>     My understanding is that draft wants to provide a solution for
>>     the problem where the active segment is a prefix/adjacency
>>     segment of the neighbor and the neighbor fails. A solution to
>>     this is possible only at a node that is enforcing the SR policy
>>     (consisting of the segment list). For a transit node, its data
>>     plane would have to peek into the label stack and determine the
>>     type of the segment/label following the active segment and act
>>     accordingly, which is not inline with the SR architecture which
>>     requires SR to work 'as is' on traditional MPLS data plane
>>
>>     ​ Muthu​
>>
>>     On Wed, Nov 22, 2017 at 8:22 PM, Alexander Vainshtein
>>     <vinesasha@yahoo.com <mailto:vinesasha@yahoo.com>> wrote:
>>
>>         Muthu and all,
>>         I do not see how the draft in quesrion us related to "SR Policy".
>>
>>         From my POV its scope is a SR LSP comprised of multiple Node
>>         SIDs within a single IGP domain, and it provides local fast
>>         protection against failure of a node that terminates one of
>>         the segments comprising this LSP. Pritection action is
>>         performed by the penultimate node.
>>
>>         My 2c.
>>
>>         Sent from Yahoo Mail on Android
>>         <https://overview.mail.yahoo.com/mobile/?.src=Android>
>>
>>             On Wed, Nov 22, 2017 at 3:27, Muthu Arul Mozhi Perumal
>>             <muthu.arul@gmail.com <mailto:muthu.arul@gmail.com>> wrote:
>>             Section 5.3
>>             of draft-bashandy-rtgwg-segment-routing-ti-lfa describes
>>             protecting SR policy midpoints against node failure for
>>             the case where the active segment is the prefix or
>>             adjacency segment of a neighbor.
>>
>>             I believe the steps described in the procedure is
>>             applicable only for a node steering packets into the SR
>>             policy. This could be an ingress PE steering IP packets
>>             into a SR-TE tunnel or an intermediate node steering
>>             labeled packets received with a BSID into a SR-TE tunnel
>>             identified by that BSID.
>>
>>             A transit node that has no idea about the SR policy
>>             itself is not expected to perform the procedure described
>>             in that section.
>>
>>             Is my understanding correct?
>>
>>             Regards,
>>             Muthu
>>             _______________________________________________
>>             rtgwg mailing list
>>             rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>>             https://www.ietf.org/mailman/listinfo/rtgwg
>>             <https://www.ietf.org/mailman/listinfo/rtgwg>
>>
>>
>>
>>
>>     _______________________________________________
>>     rtgwg mailing list
>>     rtgwg@ietf.org  <mailto:rtgwg@ietf.org>
>>     https://www.ietf.org/mailman/listinfo/rtgwg  <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>


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<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Thanks for the feedback<br>
    <br>
    See inline<br>
    <br>
    Ahmed<br>
    <br>
    <div class="moz-cite-prefix">On 11/28/2017 8:54 AM, Muthu Arul Mozhi
      Perumal wrote:<br>
    </div>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><span
            style="font-family:arial,sans-serif">On Tue, Nov 28, 2017 at
            5:34 PM, Ahmed Bashandy (bashandy) </span><span dir="ltr"
            style="font-family:arial,sans-serif">&lt;<a
              moz-do-not-send="true" href="mailto:bashandy@cisco.com"
              target="_blank">bashandy@cisco.com</a>&gt;</span><span
            style="font-family:arial,sans-serif"> wrote:</span><br>
        </div>
        <div class="gmail_extra">
          <div class="gmail_quote">
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div bgcolor="#FFFFFF" text="#000000"> Hi,<br>
                <br>
                The behavior described in section 5.3 is clear: <br>
                - The top label of incoming packet to node "S" is either
                a prefix SID owned by node "F" or an adjacency SID for
                (S,F)<br>
                - If the link from node "S" to node "F" is up, then the
                normal behavior for node "S" is to apply penultimate hop
                popping (PHP). HEnce node "S"  *pops* the top label and
                sends the packet to node "F"<br>
                - But if the link (S,F) is down and "S" is configured to
                do node protection, then node "S" will still pop the top
                label. This will promote the label right underneath the
                incoming label to become the *top* label. Hence there is
                no need to peek into the label stack<br>
              </div>
            </blockquote>
            <div><br>
            </div>
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">​
                What if the new top label is a BSID assigned from the
                SRLB of node F or a BGP-LU or a VPN label assigned by
                node F?​</div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    #Ahmed: I just replied to Robert. Let me put it here<br>
    The node "S" knows the SRGB and the adj-SIDs of the  neighboring
    node "F". Hence if the new top label is not within these two sets,
    then the node "S" will always be able to know that the node that
    failed is NOT a midpoint.<br>
    I will add a statement in the document to explain how a node can
    determine that a failure is a midpoint failure. I will also add a
    statement to indicate that if the node determines that the failure
    is not a midpoint failure then it may apply other protection
    techniques that are beyond the scope of this document or simply drop
    the packet and wait for normal protocol conversion.<br>
    <br>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div> </div>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div bgcolor="#FFFFFF" text="#000000"> - In a link-state
                envirnoment, node "S" knows the SRGB of node "F" as well
                as all adjacency SIDs of node "F". Hence it can now
                compare the new top label against the SRGB or the list
                of adj-SIDs of the node "F"<br>
              </div>
            </blockquote>
            <div><br>
            </div>
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">​
                What does "it" stand for in "it can now compare"?  <br>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    "Ahmed: "It" refers to the node "S"<br>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
              </div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">​
                For the control plane to be able to compare it also
                needs to be imposing the SR policy as I said earlier. <br>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    #Ahmed: There is no control plane comparison.<br>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
              </div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">Or
                is the MPLS data plane expected to do such a comparison
                on the fly?</div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    #Ahmed: data plane is expected to do such comparison. It is not that
    difficult. Just make sure you have a good forwarding ASIC :)<br>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div> </div>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div bgcolor="#FFFFFF" text="#000000"> - If the new top
                label is within the SRGB of node "F" or an adj-SID of
                node "F", then node "S" applies the behavior described
                in section 5.3.1 or section 5.3.2, respectively<br>
                <br>
                The bottom line is that there is no need for any peeking
                into the label stack. Just inspect the new top label<br>
              </div>
            </blockquote>
            <div><br>
            </div>
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">​
                How is the MPLS data plane in a transit node expected to
                be programmed to make this work?</div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    #Ahmed: Implementation details that should become big problems for
    good forwarding ASICs :)<br>
    <blockquote
cite="mid:CAKz0y8xsM975vAUj4PFf0Lpx=5R4_yyAkpyOsHMvWfhM-sgKJg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
              </div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
              <div class="gmail_default"
                style="font-family:arial,helvetica,sans-serif;font-size:small">Muthu
                ​</div>
              <br>
            </div>
            <div> </div>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div bgcolor="#FFFFFF" text="#000000"> Thanks<span
                  class="HOEnZb"><font color="#888888"><br>
                    <br>
                    Ahmed</font></span>
                <div>
                  <div class="h5"><br>
                    <br>
                    <div class="m_-8406801806101366794moz-cite-prefix">On
                      11/23/2017 5:04 AM, Muthu Arul Mozhi Perumal
                      wrote:<br>
                    </div>
                    <blockquote type="cite">
                      <div dir="ltr">
                        <div>
                          <div><font face="arial, helvetica, sans-serif">My
                              understanding is that draft wants to
                              provide a solution for the problem where
                              the active segment is a prefix/adjacency
                              segment of the neighbor and the neighbor
                              fails. A solution to this is possible only
                              at a node that is enforcing the SR policy
                              (consisting of the segment list). </font><span
style="font-family:arial,helvetica,sans-serif">For a transit node, its
                              data plane would have to peek into the
                              label stack and determine the type of the
                              segment/label following the active segment
                              and act accordingly, which is not inline
                              with the SR architecture which requires SR
                              to work 'as is' on traditional MPLS data
                              plane</span></div>
                          <div
                            style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                          </div>
                        </div>
                        <div class="gmail_extra">
                          <div
                            style="font-family:arial,helvetica,sans-serif;font-size:small">​
                            Muthu​</div>
                          <br>
                          <div class="gmail_quote">On Wed, Nov 22, 2017
                            at 8:22 PM, Alexander Vainshtein <span
                              dir="ltr">&lt;<a moz-do-not-send="true"
                                href="mailto:vinesasha@yahoo.com"
                                target="_blank">vinesasha@yahoo.com</a>&gt;</span>
                            wrote:<br>
                            <blockquote class="gmail_quote"
                              style="margin:0px 0px 0px
                              0.8ex;border-left:1px solid
                              rgb(204,204,204);padding-left:1ex">Muthu
                              and all,
                              <div
id="m_-8406801806101366794gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362077836">I
                                do not see how the draft in quesrion us
                                related to "SR Policy".</div>
                              <div
id="m_-8406801806101366794gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362111884"><br>
                              </div>
                              <div
id="m_-8406801806101366794gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362112091">From

                                my POV its scope is a SR LSP comprised
                                of multiple Node SIDs within a single
                                IGP domain, and it provides local fast
                                protection against failure of a node
                                that terminates one of the segments
                                comprising this LSP. Pritection action
                                is performed by the penultimate node.</div>
                              <div
id="m_-8406801806101366794gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362349834"><br>
                              </div>
                              <div
id="m_-8406801806101366794gmail-m_-4932204748884570604yMail_cursorElementTracker_1511362350059">My

                                2c.<br>
                                <br>
                                <div
id="m_-8406801806101366794gmail-m_-4932204748884570604ymail_android_signature"><a
                                    moz-do-not-send="true"
                                    href="https://overview.mail.yahoo.com/mobile/?.src=Android"
                                    target="_blank">Sent from Yahoo Mail
                                    on Android</a></div>
                                <br>
                                <blockquote style="margin:0px 0px 20px">
                                  <div>
                                    <div
                                      class="m_-8406801806101366794gmail-h5">
                                      <div
                                        style="font-family:Roboto,sans-serif;color:rgb(109,0,246)">
                                        <div>On Wed, Nov 22, 2017 at
                                          3:27, Muthu Arul Mozhi Perumal</div>
                                        <div>&lt;<a
                                            moz-do-not-send="true"
                                            href="mailto:muthu.arul@gmail.com"
                                            target="_blank">muthu.arul@gmail.com</a>&gt;

                                          wrote:</div>
                                      </div>
                                    </div>
                                  </div>
                                  <div style="padding:10px 0px 0px
                                    20px;margin:10px 0px
                                    0px;border-left:1px solid
                                    rgb(109,0,246)">
                                    <div>
                                      <div
                                        class="m_-8406801806101366794gmail-h5">
                                        <div
                                          id="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294">
                                          <div dir="ltr">
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Section
                                              5.3
                                              of draft-bashandy-rtgwg-segmen<wbr>t-routing-ti-lfa

                                              describes protecting SR
                                              policy midpoints against
                                              node failure for the case
                                              where the active segment
                                              is the prefix or adjacency
                                              segment of a neighbor.</div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                            </div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">I believe
                                              the steps described in the
                                              procedure is applicable
                                              only for a node steering
                                              packets into the SR
                                              policy. This could be an
                                              ingress PE steering IP
                                              packets into a SR-TE
                                              tunnel or an intermediate
                                              node steering labeled
                                              packets received with a
                                              BSID into a SR-TE tunnel
                                              identified by that BSID.</div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                            </div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">A transit
                                              node that has no idea
                                              about the SR policy itself
                                              is not expected to perform
                                              the procedure described in
                                              that section.</div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                            </div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Is my
                                              understanding correct?</div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                                            </div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
                                            <div
class="m_-8406801806101366794gmail-m_-4932204748884570604yiv2858571294gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div>
                                          </div>
                                        </div>
                                      </div>
                                    </div>
                                    ______________________________<wbr>_________________<br>
                                    rtgwg mailing list<br>
                                    <a moz-do-not-send="true"
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                                      target="_blank">https://www.ietf.org/mailman/l<wbr>istinfo/rtgwg</a><br>
                                  </div>
                                </blockquote>
                              </div>
                            </blockquote>
                          </div>
                          <br>
                        </div>
                      </div>
                      <br>
                      <fieldset
                        class="m_-8406801806101366794mimeAttachmentHeader"></fieldset>
                      <br>
                      <pre>______________________________<wbr>_________________
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</pre>
                    </blockquote>
                    <br>
                  </div>
                </div>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
      </div>
    </blockquote>
    <br>
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Date: Tue, 28 Nov 2017 17:54:01 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "bashandy@cisco.com" <bashandy@cisco.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
Message-ID: <538203413.5004289.1511891641853@mail.yahoo.com>
In-Reply-To: <5A1D9989.6080002@cisco.com>
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <1776763839.4755621.1511885056113@mail.yahoo.com> <5A1D9989.6080002@cisco.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Ahmed,Regarding what was not clear:
As I see it, you have been carefully avoiding usage of the RFC 5331 languag=
e (context-specific label spaces and context identifiers) in=C2=A0your SR-r=
elated drafts. We (you and I) have already discussed this point wrt the SR =
anycast draft.=C2=A0
Regarding the overlap: it is quite substantial IMHO and should be addressed=
 in some way.

Sent from Yahoo Mail on Android=20
=20
  On Tue, Nov 28, 2017 at 11:14, Ahmed Bashandy (bashandy)<bashandy@cisco.c=
om> wrote:   _______________________________________________
rtgwg mailing list
rtgwg@ietf.org
https://www.ietf.org/mailman/listinfo/rtgwg
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Ahmed,<div id=3D"yMail_cursorElementTracker_1511891151328">Regarding what w=
as not clear:</div><div id=3D"yMail_cursorElementTracker_1511891513111"><br=
><div id=3D"yMail_cursorElementTracker_1511889417023">As I see it, you have=
 been carefully avoiding usage of the RFC 5331 language (<span style=3D"fon=
t-family: sans-serif;" id=3D"yMail_cursorElementTracker_1511891366054">cont=
ext-specific label spaces and context identifiers) in</span>&nbsp;your SR-r=
elated drafts. We (you and I) have already discussed this point wrt the SR =
anycast draft.&nbsp;</div><div id=3D"yMail_cursorElementTracker_15118915152=
81"><br></div><div id=3D"yMail_cursorElementTracker_1511891515696">Regardin=
g the overlap: it is quite substantial IMHO and should be addressed in some=
 way.</div><div id=3D"yMail_cursorElementTracker_1511891623187"><br><br><di=
v id=3D"ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com=
/mobile/?.src=3DAndroid">Sent from Yahoo Mail on Android</a></div> <br> <bl=
ockquote style=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto, s=
ans-serif; color:#6D00F6;"> <div>On Tue, Nov 28, 2017 at 11:14, Ahmed Basha=
ndy (bashandy)</div><div>&lt;bashandy@cisco.com&gt; wrote:</div> </div> <di=
v style=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px sol=
id #6D00F6;"> _______________________________________________<br clear=3D"n=
one">rtgwg mailing list<br clear=3D"none"><a shape=3D"rect" ymailto=3D"mail=
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From nobody Tue Nov 28 12:06:20 2017
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Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
To: "sasha@axerra.com" <sasha@axerra.com>, "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "vinesasha@yahoo.com" <vinesasha@yahoo.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <8948158b-6fbe-4458-476a-ea1f8f34ee6c@gmail.com> <1697824571.4923773.1511885540152@mail.yahoo.com>
From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Tue, 28 Nov 2017 20:06:12 +0000
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2. looks to be similar to 1+1 backup from the headend, which would be 
the normal default, but you have to prevent the packet going down the 
repair.

What would be nice would be to install a tailored backup hence:

3. Install a purpose built backup and somehow map to it on failure.

Both of these are analogous to the RSVP solutions.

Maybe to do 3 you use an SPL followed by a policy identifier so that the 
FRR node knows to abandon the repair or to pick a particular path such 
as a particular binding SID.

- Stewart


On 28/11/2017 16:12, Alexander Vainshtein wrote:
> Stewart,
> I understand your concern. However, as I see it, the alternatives to 
> local protection of a failed pinned node of a SR-TE LSP are somewhat 
> limited:
>
> 1. You can wait (with no traffic) until failure of the pinned node is 
> recognized (e.g., fillowing IGP cobversion) and a new policy(that does 
> not inckude the failed node) is recomputed and installed.
>
> 2. You can pre-compute and pre-install a backup policy that does not 
> have any common pinned nodes with the original ones and, once the 
> origibal policy fails, switch ti the backup one end-to-end.
>
> My 2c.
>
>
>
> Sent from Yahoo Mail on Android 
> <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
>     On Tue, Nov 28, 2017 at 9:15, Stewart Bryant
>     <stewart.bryant@gmail.com> wrote:
>
>
>     On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
>     >
>     > - The top label of incoming packet to node "S" is either a
>     prefix SID
>     > owned by node "F" or an adjacency SID for (S,F)
>
>     If it is an adjacency SID for (S,F) then you are violating the
>     original
>     intent of the ingress PE which was to send the packet along the path
>     S->F. I really don't think you can blindly repair such a packet
>     since to
>     do so violates the policy applied to the packet. You have to do a
>     policy
>     check, and you have to make sure that the packet is not subject to
>     ECMP
>     along the repair path since ECMP avoidance might have been the
>     intent of
>     using the SR Adjacency in the first place.
>
>     - Stewart
>
>
>     _______________________________________________
>     rtgwg mailing list
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    <p><br>
    </p>
    2. looks to be similar to 1+1 backup from the headend, which would
    be the normal default, but you have to prevent the packet going down
    the repair.<br>
    <br>
    What would be nice would be to install a tailored backup hence:<br>
    <br>
    3. Install a purpose built backup and somehow map to it on failure.<br>
    <br>
    Both of these are analogous to the RSVP solutions.<br>
    <br>
    Maybe to do 3 you use an SPL followed by a policy identifier so that
    the FRR node knows to abandon the repair or to pick a particular
    path such as a particular binding SID.<br>
    <br>
    - Stewart<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 28/11/2017 16:12, Alexander
      Vainshtein wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:1697824571.4923773.1511885540152@mail.yahoo.com">Stewart,
      <div id="yMail_cursorElementTracker_1511885159915">I understand
        your concern. However, as I see it, the alternatives to local
        protection of a failed pinned node of a SR-TE LSP are somewhat
        limited:</div>
      <div id="yMail_cursorElementTracker_1511885274373"><br>
      </div>
      <div id="yMail_cursorElementTracker_1511885274527">1. You can wait
        (with no traffic) until failure of the pinned node is recognized
        (e.g., fillowing IGP cobversion) and a new policy(that does not
        inckude the failed node) is recomputed and installed. </div>
      <div id="yMail_cursorElementTracker_1511885413457"><br>
      </div>
      <div id="yMail_cursorElementTracker_1511885414040">2. You can
        pre-compute and pre-install a backup policy that does not have
        any common pinned nodes with the original ones and, once the
        origibal policy fails, switch ti the backup one end-to-end.</div>
      <div id="yMail_cursorElementTracker_1511885527265"><br>
      </div>
      <div id="yMail_cursorElementTracker_1511885527436">My 2c.</div>
      <div id="yMail_cursorElementTracker_1511885511094"><br>
      </div>
      <div id="yMail_cursorElementTracker_1511885511284"><br
          id="yMail_cursorElementTracker_1511885102336">
        <br>
        <div id="ymail_android_signature"><a
            href="https://overview.mail.yahoo.com/mobile/?.src=Android"
            moz-do-not-send="true">Sent from Yahoo Mail on Android</a></div>
        <br>
        <blockquote style="margin: 0 0 20px 0;">
          <div style="font-family:Roboto, sans-serif; color:#6D00F6;">
            <div>On Tue, Nov 28, 2017 at 9:15, Stewart Bryant</div>
            <div><a class="moz-txt-link-rfc2396E" href="mailto:stewart.bryant@gmail.com">&lt;stewart.bryant@gmail.com&gt;</a> wrote:</div>
          </div>
          <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0;
            border-left: 1px solid #6D00F6;"> <br clear="none">
            <br clear="none">
            On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:<br
              clear="none">
            &gt;<br clear="none">
            &gt; - The top label of incoming packet to node "S" is
            either a prefix SID <br clear="none">
            &gt; owned by node "F" or an adjacency SID for (S,F)<br
              clear="none">
            <br clear="none">
            If it is an adjacency SID for (S,F) then you are violating
            the original <br clear="none">
            intent of the ingress PE which was to send the packet along
            the path <br clear="none">
            S-&gt;F. I really don't think you can blindly repair such a
            packet since to <br clear="none">
            do so violates the policy applied to the packet. You have to
            do a policy <br clear="none">
            check, and you have to make sure that the packet is not
            subject to ECMP <br clear="none">
            along the repair path since ECMP avoidance might have been
            the intent of <br clear="none">
            using the SR Adjacency in the first place.<br clear="none">
            <br clear="none">
            - Stewart
            <div class="yqt8419071237 yQTDBase" id="yqtfd59910"><br
                clear="none">
              <br clear="none">
              _______________________________________________<br
                clear="none">
              rtgwg mailing list<br clear="none">
              <a shape="rect" ymailto="mailto:rtgwg@ietf.org"
                href="mailto:rtgwg@ietf.org" moz-do-not-send="true">rtgwg@ietf.org</a><br
                clear="none">
              <a shape="rect"
                href="https://www.ietf.org/mailman/listinfo/rtgwg"
                target="_blank" moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/rtgwg</a><br
                clear="none">
            </div>
          </div>
        </blockquote>
      </div>
    </blockquote>
    <br>
  </body>
</html>

--------------C03E4EEA45807648CF838B81--


From nobody Tue Nov 28 13:32:13 2017
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Date: Tue, 28 Nov 2017 21:32:06 +0000 (UTC)
From: Alexander Vainshtein <vinesasha@yahoo.com>
Reply-To: "sasha@axerra.com" <sasha@axerra.com>
To: "stewart.bryant@gmail.com" <stewart.bryant@gmail.com>,  "sasha@axerra.com" <sasha@axerra.com>,  "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>
Message-ID: <970307042.5184286.1511904726739@mail.yahoo.com>
In-Reply-To: <b827dedb-951a-98fc-f81e-7a4165a003c1@gmail.com>
References: <CAKz0y8wLYjkSO486w5WpSuDYV3Cjvgkv6887o9-Ky9o_ViWMrQ@mail.gmail.com> <210606893.1211556.1511362363266@mail.yahoo.com> <CAKz0y8xeYnqOjLxADVwndtOp8QQaPeQBiAO2TtnCi6pYfebONA@mail.gmail.com> <5A1D50E5.7030302@cisco.com> <8948158b-6fbe-4458-476a-ea1f8f34ee6c@gmail.com> <1697824571.4923773.1511885540152@mail.yahoo.com> <b827dedb-951a-98fc-f81e-7a4165a003c1@gmail.com>
Subject: Re: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Stewart,Lots of thanks for a prompt response.From my POV "normal" FRR (base=
d on LFA or RLFA) can be employed safely to protect against the"middle of a=
 segment" link and/or node failure without any impact on the policy. And it=
 would not respond to failure of the nodes (or links) that are part of the =
policy unless the mechanism defined in draft-hegde or in Section 5.3 of thi=
s draft (hich are the same mechanism under different names) were enabled.
My definituon of (2)=C2=A0 explicitly states that main abd backup policues =
should not have any common SIDs. So I do not see much difference between (2=
) and (3).
What did I miss?
Sent from Yahoo Mail on Android=20
=20
  On Tue, Nov 28, 2017 at 14:06, Stewart Bryant<stewart.bryant@gmail.com> w=
rote:   =20

=20
 2. looks to be similar to 1+1 backup from the headend, which would be the =
normal default, but you have to prevent the packet going down the repair.
=20
 What would be nice would be to install a tailored backup hence:
=20
 3. Install a purpose built backup and somehow map to it on failure.
=20
 Both of these are analogous to the RSVP solutions.
=20
 Maybe to do 3 you use an SPL followed by a policy identifier so that the F=
RR node knows to abandon the repair or to pick a particular path such as a =
particular binding SID.
=20
 - Stewart
=20
=20
 On 28/11/2017 16:12, Alexander Vainshtein wrote:
 =20
Stewart, I understand your concern. However, as I see it, the alternatives =
to local protection of a failed pinned node of a SR-TE LSP are somewhat lim=
ited:=20
  1. You can wait (with no traffic) until failure of the pinned node is rec=
ognized (e.g., fillowing IGP cobversion) and a new policy(that does not inc=
kude the failed node) is recomputed and installed.=C2=A0=20
  2. You can pre-compute and pre-install a backup policy that does not have=
 any common pinned nodes with the original ones and, once the origibal poli=
cy fails, switch ti the backup one end-to-end.=20
  My 2c.=20
 =20
=20
 Sent from Yahoo Mail on Android=20
=20
  On Tue, Nov 28, 2017 at 9:15, Stewart Bryant <stewart.bryant@gmail.com> w=
rote:  =20
=20
 On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:
 >
 > - The top label of incoming packet to node "S" is either a prefix SID=20
 > owned by node "F" or an adjacency SID for (S,F)
=20
 If it is an adjacency SID for (S,F) then you are violating the original=20
 intent of the ingress PE which was to send the packet along the path=20
 S->F. I really don't think you can blindly repair such a packet since to=
=20
 do so violates the policy applied to the packet. You have to do a policy=
=20
 check, and you have to make sure that the packet is not subject to ECMP=20
 along the repair path since ECMP avoidance might have been the intent of=
=20
 using the SR Adjacency in the first place.
=20
 - Stewart=20
=20
 _______________________________________________
 rtgwg mailing list
 rtgwg@ietf.org
 https://www.ietf.org/mailman/listinfo/rtgwg
  =20
 =20
=20
  =20

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Stewart,<div id=3D"yMail_cursorElementTracker_1511902571842">Lots of thanks=
 for a prompt response.</div><div id=3D"yMail_cursorElementTracker_15119025=
91120">From my POV "normal" FRR (based on LFA or RLFA) can be employed safe=
ly to protect against the"middle of a segment" link and/or node failure wit=
hout any impact on the policy. And it would not respond to failure of the n=
odes (or links) that are part of the policy unless the mechanism defined in=
 draft-hegde or in Section 5.3 of this draft (hich are the same mechanism u=
nder different names) were enabled.</div><div id=3D"yMail_cursorElementTrac=
ker_1511904558775"><br></div><div id=3D"yMail_cursorElementTracker_15119045=
59369">My definituon of (2)&nbsp; explicitly states that main abd backup po=
licues should not have any common SIDs. So I do not see much difference bet=
ween (2) and (3).</div><div id=3D"yMail_cursorElementTracker_1511904708906"=
><br></div><div id=3D"yMail_cursorElementTracker_1511904709107">What did I =
miss?</div><div id=3D"yMail_cursorElementTracker_1511902591656"><br><div id=
=3D"ymail_android_signature"><a href=3D"https://overview.mail.yahoo.com/mob=
ile/?.src=3DAndroid">Sent from Yahoo Mail on Android</a></div> <br> <blockq=
uote style=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto, sans-=
serif; color:#6D00F6;"> <div>On Tue, Nov 28, 2017 at 14:06, Stewart Bryant<=
/div><div>&lt;stewart.bryant@gmail.com&gt; wrote:</div> </div> <div style=
=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D0=
0F6;"> <div id=3D"yiv3246462219"><div>
    <p><br clear=3D"none">
    </p>
    2. looks to be similar to 1+1 backup from the headend, which would
    be the normal default, but you have to prevent the packet going down
    the repair.<br clear=3D"none">
    <br clear=3D"none">
    What would be nice would be to install a tailored backup hence:<br clea=
r=3D"none">
    <br clear=3D"none">
    3. Install a purpose built backup and somehow map to it on failure.<br =
clear=3D"none">
    <br clear=3D"none">
    Both of these are analogous to the RSVP solutions.<br clear=3D"none">
    <br clear=3D"none">
    Maybe to do 3 you use an SPL followed by a policy identifier so that
    the FRR node knows to abandon the repair or to pick a particular
    path such as a particular binding SID.<br clear=3D"none">
    <br clear=3D"none">
    - Stewart<br clear=3D"none">
    <br clear=3D"none">
    <br clear=3D"none">
    <div class=3D"yiv3246462219yqt3913776498 yQTDBase" id=3D"yiv3246462219y=
qt99168"><div class=3D"yiv3246462219moz-cite-prefix">On 28/11/2017 16:12, A=
lexander
      Vainshtein wrote:<br clear=3D"none">
    </div>
    <blockquote type=3D"cite">Stewart,
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885159915">I u=
nderstand
        your concern. However, as I see it, the alternatives to local
        protection of a failed pinned node of a SR-TE LSP are somewhat
        limited:</div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885274373"><br=
 clear=3D"none">
      </div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885274527">1. =
You can wait
        (with no traffic) until failure of the pinned node is recognized
        (e.g., fillowing IGP cobversion) and a new policy(that does not
        inckude the failed node) is recomputed and installed.&nbsp;</div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885413457"><br=
 clear=3D"none">
      </div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885414040">2. =
You can
        pre-compute and pre-install a backup policy that does not have
        any common pinned nodes with the original ones and, once the
        origibal policy fails, switch ti the backup one end-to-end.</div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885527265"><br=
 clear=3D"none">
      </div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885527436">My =
2c.</div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885511094"><br=
 clear=3D"none">
      </div>
      <div id=3D"yiv3246462219yMail_cursorElementTracker_1511885511284"><br=
 clear=3D"none" id=3D"yiv3246462219yMail_cursorElementTracker_1511885102336=
">
        <br clear=3D"none">
        <div id=3D"yiv3246462219ymail_android_signature"><a rel=3D"nofollow=
" shape=3D"rect" target=3D"_blank" href=3D"https://overview.mail.yahoo.com/=
mobile/?.src=3DAndroid">Sent from Yahoo Mail on Android</a></div>
        <br clear=3D"none">
        <blockquote style=3D"margin:0 0 20px 0;">
          <div style=3D"font-family:Roboto, sans-serif;color:#6D00F6;">
            <div>On Tue, Nov 28, 2017 at 9:15, Stewart Bryant</div>
            <div><a rel=3D"nofollow" shape=3D"rect" class=3D"yiv3246462219m=
oz-txt-link-rfc2396E" ymailto=3D"mailto:stewart.bryant@gmail.com" target=3D=
"_blank" href=3D"mailto:stewart.bryant@gmail.com">&lt;stewart.bryant@gmail.=
com&gt;</a> wrote:</div>
          </div>
          <div style=3D"padding:10px 0 0 20px;margin:10px 0 0 0;border-left=
:1px solid #6D00F6;"> <br clear=3D"none">
            <br clear=3D"none">
            On 28/11/2017 12:04, Ahmed Bashandy (bashandy) wrote:<br clear=
=3D"none">
            &gt;<br clear=3D"none">
            &gt; - The top label of incoming packet to node "S" is
            either a prefix SID <br clear=3D"none">
            &gt; owned by node "F" or an adjacency SID for (S,F)<br clear=
=3D"none">
            <br clear=3D"none">
            If it is an adjacency SID for (S,F) then you are violating
            the original <br clear=3D"none">
            intent of the ingress PE which was to send the packet along
            the path <br clear=3D"none">
            S-&gt;F. I really don't think you can blindly repair such a
            packet since to <br clear=3D"none">
            do so violates the policy applied to the packet. You have to
            do a policy <br clear=3D"none">
            check, and you have to make sure that the packet is not
            subject to ECMP <br clear=3D"none">
            along the repair path since ECMP avoidance might have been
            the intent of <br clear=3D"none">
            using the SR Adjacency in the first place.<br clear=3D"none">
            <br clear=3D"none">
            - Stewart
            <div class=3D"yiv3246462219yqt8419071237 yiv3246462219yQTDBase"=
 id=3D"yiv3246462219yqtfd59910"><br clear=3D"none">
              <br clear=3D"none">
              _______________________________________________<br clear=3D"n=
one">
              rtgwg mailing list<br clear=3D"none">
              <a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:rtgwg@ie=
tf.org" target=3D"_blank" href=3D"mailto:rtgwg@ietf.org">rtgwg@ietf.org</a>=
<br clear=3D"none">
              <a rel=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"=
https://www.ietf.org/mailman/listinfo/rtgwg">https://www.ietf.org/mailman/l=
istinfo/rtgwg</a><br clear=3D"none">
            </div>
          </div>
        </blockquote>
      </div>
    </blockquote></div>
    <br clear=3D"none">
  </div></div> </div> </blockquote></div>
------=_Part_5184285_38724685.1511904726737--


From nobody Tue Nov 28 21:34:13 2017
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From: Sikhivahan Gundu <sikhivahan.gundu@ericsson.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, "sasha@axerra.com" <sasha@axerra.com>, "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, "Muthu Arul Mozhi Perumal" <muthu.arul@gmail.com>, "vinesasha@yahoo.com" <vinesasha@yahoo.com>
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Subject: RE: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
Thread-Topic: Protecting SR policy midpoints (draft-bashandy-rtgwg-segment-routing-ti-lfa)
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Date: Wed, 29 Nov 2017 07:19:24 -0800
Subject: Re: RTGWG WGLC draft-ietf-rtgwg-ni-model
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
CC: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>, Benoit Claise <bclaise@cisco.com>, Rtg-dt-yang-arch <rtg-dt-yang-arch-bounces@ietf.org>
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Dear RTGWG,

The WGLC has been concluded, after the authors will have shepherd comments addressed the draft will be submitted to the IESG.  

Cheers,
Jeff

-----Original Message-----
From: Jeff Tantsura <jefftant.ietf@gmail.com>
Date: Monday, October 23, 2017 at 14:17
To: RTGWG <rtgwg@ietf.org>
Cc: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>, Benoit Claise <bclaise@cisco.com>, Rtg-dt-yang-arch <rtg-dt-yang-arch-bounces@ietf.org>
Subject: RTGWG WGLC draft-ietf-rtgwg-ni-model

    Dear RTGWG,
    
    The authors have requested the RTGWG to last call draft-ietf-rtgwg-ni-model.
    
    The interdependencies related to draft-ietf-netmod-schema-mount have been addressed.
    There was consensus that document is ready for the last call during the last IETF meeting 
    and the authors have addressed all the comments from Directorate QA review and YANGDOCTORS.
    Please indicate support or no-support by November 6, 2017.
    
    IPR:
    If you are listed as a document author or contributor, please respond to this 
    email of whether or not you are aware of any relevant IPR. 
    The response needs to be sent to the RTGWG mailing list.
    The document will not advance to the next stage until a response has been 
    received from each author and each individual that has contributed to the document.
    
    Thanks,
    Jeff & Chris
    
    
    
    
    



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Subject: Re: RTGWG WGLC draft-ietf-rtgwg-lne-model
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
CC: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>, Benoit Claise <bclaise@cisco.com>, Rtg-dt-yang-arch <rtg-dt-yang-arch-bounces@ietf.org>
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Dear RTGWG,

The WGLC has been concluded, after the authors will have shepherd comments addressed the draft will be submitted to the IESG.  

Cheers,
Jeff
-----Original Message-----
From: Jeff Tantsura <jefftant.ietf@gmail.com>
Date: Monday, October 23, 2017 at 14:17
To: RTGWG <rtgwg@ietf.org>
Cc: 'rtgwg-chairs' <rtgwg-chairs@tools.ietf.org>, Benoit Claise <bclaise@cisco.com>, Rtg-dt-yang-arch <rtg-dt-yang-arch-bounces@ietf.org>
Subject: RTGWG WGLC draft-ietf-rtgwg-lne-model

    Dear RTGWG,
    
    The authors have requested the RTGWG to last call draft-ietf-rtgwg-lne-model
    
    The interdependencies related to draft-ietf-netmod-schema-mount have been addressed.
    There was consensus that document is ready for the last call during the last IETF meeting 
    and the authors have addressed all the comments from Directorate QA review and YANGDOCTORS.
    Please indicate support or no-support by November 6, 2017.
    
    IPR:
    If you are listed as a document author or contributor, please respond to this 
    email of whether or not you are aware of any relevant IPR. 
    The response needs to be sent to the RTGWG mailing list.
    The document will not advance to the next stage until a response has been 
    received from each author and each individual that has contributed to the document.
    
    Thanks,
    Jeff & Chris
    
    
    
    



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Subject: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: RTGWG <rtgwg@ietf.org>
CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, <draft-ietf-rtgwg-backoff-algo@ietf.org>
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Dear RTGWG,
    
The authors have requested the RTGWG to last call draft-ietf-rtgwg-backoff-algo.
    
There was consensus that document is ready for the last call and the authors have addressed all the comments from RTGDIR review. 
Please indicate support or no-support by December 14, 2017.

IPR:
If you are listed as a document author or contributor, please respond to this
email of whether or not you are aware of any relevant IPR.
The response needs to be sent to the RTGWG mailing list.
The document will not advance to the next stage until a response has been
received from each author and each individual that has contributed to the document.

Cheers,
Jeff & Chris



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From: <bruno.decraene@orange.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, RTGWG <rtgwg@ietf.org>
CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
Subject: RE: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
Thread-Topic: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
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Date: Wed, 29 Nov 2017 15:57:48 +0000
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From: Alexander Vainshtein <vinesasha@yahoo.com>
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To: "jefftant.ietf@gmail.com" <jefftant.ietf@gmail.com>,  RTGWG <rtgwg@ietf.org>
Cc: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>,  "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
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Subject: Re: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
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Support.

Sent from Yahoo Mail on Android=20
=20
  On Wed, Nov 29, 2017 at 9:41, Jeff Tantsura<jefftant.ietf@gmail.com> wrot=
e:   Dear RTGWG,
=C2=A0 =C2=A0=20
The authors have requested the RTGWG to last call draft-ietf-rtgwg-backoff-=
algo.
=C2=A0 =C2=A0=20
There was consensus that document is ready for the last call and the author=
s have addressed all the comments from RTGDIR review.=20
Please indicate support or no-support by December 14, 2017.

IPR:
If you are listed as a document author or contributor, please respond to th=
is
email of whether or not you are aware of any relevant IPR.
The response needs to be sent to the RTGWG mailing list.
The document will not advance to the next stage until a response has been
received from each author and each individual that has contributed to the d=
ocument.

Cheers,
Jeff & Chris


_______________________________________________
rtgwg mailing list
rtgwg@ietf.org
https://www.ietf.org/mailman/listinfo/rtgwg
 =20

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Support.<br><br><div id=3D"ymail_android_signature"><a href=3D"https://over=
view.mail.yahoo.com/mobile/?.src=3DAndroid">Sent from Yahoo Mail on Android=
</a></div> <br> <blockquote style=3D"margin: 0 0 20px 0;"> <div style=3D"fo=
nt-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Wed, Nov 29, 2017 at=
 9:41, Jeff Tantsura</div><div>&lt;jefftant.ietf@gmail.com&gt; wrote:</div>=
 </div> <div style=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-le=
ft: 1px solid #6D00F6;"> <div dir=3D"ltr">Dear RTGWG,<br></div><div dir=3D"=
ltr">&nbsp; &nbsp; <br></div><div dir=3D"ltr">The authors have requested th=
e RTGWG to last call draft-ietf-rtgwg-backoff-algo.<br></div><div dir=3D"lt=
r">&nbsp; &nbsp; <br></div><div dir=3D"ltr">There was consensus that docume=
nt is ready for the last call and the authors have addressed all the commen=
ts from RTGDIR review. <br></div><div dir=3D"ltr">Please indicate support o=
r no-support by December 14, 2017.<br></div><div dir=3D"ltr"><br></div><div=
 dir=3D"ltr">IPR:<br></div><div dir=3D"ltr">If you are listed as a document=
 author or contributor, please respond to this<br></div><div dir=3D"ltr">em=
ail of whether or not you are aware of any relevant IPR.<br></div><div dir=
=3D"ltr">The response needs to be sent to the RTGWG mailing list.<br></div>=
<div dir=3D"ltr">The document will not advance to the next stage until a re=
sponse has been<br></div><div dir=3D"ltr">received from each author and eac=
h individual that has contributed to the document.<br></div><div dir=3D"ltr=
"><br></div><div dir=3D"ltr">Cheers,<br></div><div dir=3D"ltr">Jeff &amp; C=
hris<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br></div><div di=
r=3D"ltr">_______________________________________________<br></div><div dir=
=3D"ltr">rtgwg mailing list<br></div><div dir=3D"ltr"><a ymailto=3D"mailto:=
rtgwg@ietf.org" href=3D"mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br></div>=
<div dir=3D"ltr"><a href=3D"https://www.ietf.org/mailman/listinfo/rtgwg" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/rtgwg</a><br></div> <=
/div> </blockquote>
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From: =?UTF-8?Q?Pierre_Fran=C3=A7ois?= <pfrpfr@gmail.com>
Date: Wed, 29 Nov 2017 17:04:37 +0100
Message-ID: <CAJm=hYNzFFQpbYOnCq6Qu4R_s7JsF+5Vs8YRVWNZQTvk2-YAsg@mail.gmail.com>
Subject: Re: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: RTGWG <rtgwg@ietf.org>, rtgwg-chairs <rtgwg-chairs@tools.ietf.org>,  draft-ietf-rtgwg-backoff-algo@ietf.org
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--94eb2c03472a1494cb055f214ca5
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Jeff,

I'm not aware of any non-disclosed IPR.

Cheers,

Pierre.

On Wed, Nov 29, 2017 at 4:41 PM, Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Dear RTGWG,
>
> The authors have requested the RTGWG to last call
> draft-ietf-rtgwg-backoff-algo.
>
> There was consensus that document is ready for the last call and the
> authors have addressed all the comments from RTGDIR review.
> Please indicate support or no-support by December 14, 2017.
>
> IPR:
> If you are listed as a document author or contributor, please respond to
> this
> email of whether or not you are aware of any relevant IPR.
> The response needs to be sent to the RTGWG mailing list.
> The document will not advance to the next stage until a response has been
> received from each author and each individual that has contributed to the
> document.
>
> Cheers,
> Jeff & Chris
>
>
>

--94eb2c03472a1494cb055f214ca5
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<div dir=3D"ltr">Jeff,=C2=A0<div><br></div><div>I&#39;m not aware of any no=
n-disclosed IPR.</div><div><br></div><div>Cheers,=C2=A0</div><div><br></div=
><div>Pierre.</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On Wed, Nov 29, 2017 at 4:41 PM, Jeff Tantsura <span dir=3D"ltr">&l=
t;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">jefftant.iet=
f@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear RT=
GWG,<br>
<br>
The authors have requested the RTGWG to last call draft-ietf-rtgwg-backoff-=
algo.<br>
<br>
There was consensus that document is ready for the last call and the author=
s have addressed all the comments from RTGDIR review.<br>
Please indicate support or no-support by December 14, 2017.<br>
<br>
IPR:<br>
If you are listed as a document author or contributor, please respond to th=
is<br>
email of whether or not you are aware of any relevant IPR.<br>
The response needs to be sent to the RTGWG mailing list.<br>
The document will not advance to the next stage until a response has been<b=
r>
received from each author and each individual that has contributed to the d=
ocument.<br>
<br>
Cheers,<br>
Jeff &amp; Chris<br>
<br>
<br>
</blockquote></div><br></div>

--94eb2c03472a1494cb055f214ca5--


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, RTGWG <rtgwg@ietf.org>
CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
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CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
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From: "Reshad Rahman (rrahman)" <rrahman@cisco.com>
To: "ietf@ietf.org" <ietf@ietf.org>
CC: "draft-ietf-rtgwg-yang-rip@ietf.org" <draft-ietf-rtgwg-yang-rip@ietf.org>,  "rtgwg@ietf.org" <rtgwg@ietf.org>, "rtgwg-chairs@ietf.org" <rtgwg-chairs@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Subject: Re: Last Call: <draft-ietf-rtgwg-yang-rip-06.txt> (A YANG Data Model for Routing Information Protocol (RIP)) to Proposed Standard
Thread-Topic: Last Call: <draft-ietf-rtgwg-yang-rip-06.txt> (A YANG Data Model for Routing Information Protocol (RIP)) to Proposed Standard
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Date: Wed, 29 Nov 2017 16:49:08 +0000
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Hi,=0A=
=0A=
The RIP YANG model uses bfd-grouping-base-cfg-parms from BFD YANG. That gro=
uping does not exist in latest revision (it has been renamed). Also, as per=
 discussions we had with OSPF/ISIS YANG authors, the grouping which should =
be used from BFD is client-cfg-parms.=0A=
=0A=
Regards,=0A=
Reshad.=0A=
________________________________________=0A=
From: rtgwg <rtgwg-bounces@ietf.org> on behalf of The IESG <iesg-secretary@=
ietf.org>=0A=
Sent: Tuesday, November 28, 2017 11:29 AM=0A=
To: IETF-Announce=0A=
Cc: draft-ietf-rtgwg-yang-rip@ietf.org; rtgwg@ietf.org; rtgwg-chairs@ietf.o=
rg=0A=
Subject: Last Call: <draft-ietf-rtgwg-yang-rip-06.txt> (A YANG Data Model f=
or Routing Information Protocol (RIP)) to Proposed Standard=0A=
=0A=
The IESG has received a request from the Routing Area Working Group WG=0A=
(rtgwg) to consider the following document: - 'A YANG Data Model for Routin=
g=0A=
Information Protocol (RIP)'=0A=
  <draft-ietf-rtgwg-yang-rip-06.txt> as Proposed Standard=0A=
=0A=
The IESG plans to make a decision in the next few weeks, and solicits final=
=0A=
comments on this action. Please send substantive comments to the=0A=
ietf@ietf.org mailing lists by 2017-12-12. Exceptionally, comments may be=
=0A=
sent to iesg@ietf.org instead. In either case, please retain the beginning =
of=0A=
the Subject line to allow automated sorting.=0A=
=0A=
Abstract=0A=
=0A=
=0A=
   This document describes a data model for the Routing Information=0A=
   Protocol (RIP).  Both RIP version 2 and RIPng are covered.=0A=
=0A=
=0A=
=0A=
=0A=
The file can be obtained via=0A=
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-rip/=0A=
=0A=
IESG discussion can be tracked via=0A=
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-rip/ballot/=0A=
=0A=
=0A=
No IPR declarations have been submitted directly on this I-D.=0A=
=0A=
=0A=
The document contains these normative downward references.=0A=
See RFC 3967 for additional information:=0A=
    draft-bjorklund-netmod-rfc7223bis: A YANG Data Model for Interface Mana=
gement (None - IETF stream)=0A=
    draft-ietf-netmod-revised-datastores: Network Management Datastore Arch=
itecture (None - IETF stream)=0A=
    draft-acee-netmod-rfc8022bis: A YANG Data Model for Routing Management =
(NDMA Version) (None - )=0A=
    draft-bjorklund-netmod-rfc7277bis: A YANG Data Model for IP Management =
(None - IETF stream)=0A=
    draft-ietf-ospf-yang: Yang Data Model for OSPF Protocol (None - IETF st=
ream)=0A=
=0A=
=0A=
=0A=
_______________________________________________=0A=
rtgwg mailing list=0A=
rtgwg@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/rtgwg=0A=


From nobody Thu Nov 30 00:36:18 2017
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CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
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From nobody Thu Nov 30 01:22:24 2017
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From: Hannes Gredler <hannes@rtbrick.com>
Date: Thu, 30 Nov 2017 10:22:19 +0100
Message-ID: <CAFVe_eqj6376RKaZCXBAC_GWjJcK=d-uKou6HSc_E+toPYXyew@mail.gmail.com>
Subject: Re: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
To: Stephane Litkowski <stephane.litkowski@orange.com>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, RTGWG <rtgwg@ietf.org>,  rtgwg-chairs <rtgwg-chairs@tools.ietf.org>,  "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
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not aware of any IPR - /hannes

On Thu, Nov 30, 2017 at 9:36 AM, <stephane.litkowski@orange.com> wrote:

> Hi,
>
> As a co-author, I=E2=80=99m not aware of any IPR.
>
> -----Original Message-----
> From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
> Sent: Wednesday, November 29, 2017 16:41
> To: RTGWG
> Cc: rtgwg-chairs; draft-ietf-rtgwg-backoff-algo@ietf.org
> Subject: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
>
> Dear RTGWG,
>
> The authors have requested the RTGWG to last call
> draft-ietf-rtgwg-backoff-algo.
>
> There was consensus that document is ready for the last call and the
> authors have addressed all the comments from RTGDIR review.
> Please indicate support or no-support by December 14, 2017.
>
> IPR:
> If you are listed as a document author or contributor, please respond to
> this email of whether or not you are aware of any relevant IPR.
> The response needs to be sent to the RTGWG mailing list.
> The document will not advance to the next stage until a response has been
> received from each author and each individual that has contributed to the
> document.
>
> Cheers,
> Jeff & Chris
>
>
>
> ____________________________________________________________
> _____________________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations
> confidentielles 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
> electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u
> falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged
> information 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
> delete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have bee=
n
> modified, changed or falsified.
> Thank you.
>
>

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<div dir=3D"ltr">not aware of any IPR - /hannes</div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Thu, Nov 30, 2017 at 9:36 AM,  <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:stephane.litkowski@orange.com" target=3D=
"_blank">stephane.litkowski@orange.com</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">Hi,<br>
<span class=3D"im HOEnZb"><br>
As a co-author, I=E2=80=99m not aware of any IPR.<br>
<br>
</span><span class=3D"im HOEnZb">-----Original Message-----<br>
From: Jeff Tantsura [mailto:<a href=3D"mailto:jefftant.ietf@gmail.com">jeff=
tant.ietf@gmail.<wbr>com</a>]<br>
</span><span class=3D"im HOEnZb">Sent: Wednesday, November 29, 2017 16:41<b=
r>
To: RTGWG<br>
Cc: rtgwg-chairs; <a href=3D"mailto:draft-ietf-rtgwg-backoff-algo@ietf.org"=
>draft-ietf-rtgwg-backoff-algo@<wbr>ietf.org</a><br>
Subject: RTGWG WGLC draft-ietf-rtgwg-backoff-algo<br>
<br>
</span><div class=3D"HOEnZb"><div class=3D"h5">Dear RTGWG,<br>
<br>
The authors have requested the RTGWG to last call draft-ietf-rtgwg-backoff-=
algo.<br>
<br>
There was consensus that document is ready for the last call and the author=
s have addressed all the comments from RTGDIR review.<br>
Please indicate support or no-support by December 14, 2017.<br>
<br>
IPR:<br>
If you are listed as a document author or contributor, please respond to th=
is email of whether or not you are aware of any relevant IPR.<br>
The response needs to be sent to the RTGWG mailing list.<br>
The document will not advance to the next stage until a response has been r=
eceived from each author and each individual that has contributed to the do=
cument.<br>
<br>
Cheers,<br>
Jeff &amp; Chris<br>
<br>
<br>
<br>
</div></div><div class=3D"HOEnZb"><div class=3D"h5">_______________________=
_______<wbr>______________________________<wbr>____________________________=
__<wbr>______________________________<wbr>_<br>
<br>
Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc<br>
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler<br>
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,<br>
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.<br>
<br>
This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;<br>
they should not be distributed, used or copied without authorisation.<br>
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.<br>
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.<br>
Thank you.<br>
<br>
</div></div></blockquote></div><br></div>

--089e082c5148f60d8c055f2fc93e--


From nobody Thu Nov 30 18:24:47 2017
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From: Uma Chunduri <uma.chunduri@huawei.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, RTGWG <rtgwg@ietf.org>
CC: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>, "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>
Subject: RE: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
Thread-Topic: RTGWG WGLC draft-ietf-rtgwg-backoff-algo
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I support this document to the next stage.


But I have some comments (10+ minor comments  + few nits)  and I definetely=
 see one more revision needed before WGLC complete.

I shared my shepherd review comments with autthors.
--
Uma C.

-----Original Message-----
From: rtgwg [mailto:rtgwg-bounces@ietf.org] On Behalf Of Jeff Tantsura
Sent: Wednesday, November 29, 2017 7:41 AM
To: RTGWG <rtgwg@ietf.org>
Cc: rtgwg-chairs <rtgwg-chairs@tools.ietf.org>; draft-ietf-rtgwg-backoff-al=
go@ietf.org
Subject: RTGWG WGLC draft-ietf-rtgwg-backoff-algo

Dear RTGWG,
   =20
The authors have requested the RTGWG to last call draft-ietf-rtgwg-backoff-=
algo.
   =20
There was consensus that document is ready for the last call and the author=
s have addressed all the comments from RTGDIR review.=20
Please indicate support or no-support by December 14, 2017.

IPR:
If you are listed as a document author or contributor, please respond to th=
is email of whether or not you are aware of any relevant IPR.
The response needs to be sent to the RTGWG mailing list.
The document will not advance to the next stage until a response has been r=
eceived from each author and each individual that has contributed to the do=
cument.

Cheers,
Jeff & Chris


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