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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi All, Section 2.3 Endpoint x Node as PLR Here we are handling 2 times failure (One layer-3 adjacency interface and = another primary interface), in all other cases we only handle one failure. Better to restrict to handling of one failure. Thanks Rajesh Juniper Internal --_000_BYAPR05MB4821035C50B704F0B20FEF94BE550BYAPR05MB4821namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi All,

 

Section 2.3 Endpoint x Node as PLR

 

Here we are handling 2  times failure (One layer-3 adjacency interfac= e and another primary interface), in all other cases we only handle one fai= lure.

Better to restrict to handling of one failure.

 

Thanks

Rajesh

 


Juniper Interna= l

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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Please find few comments on this draft 1. Section 3.1.1 , below must be Ref2 Ref1: Hardware (microcode) just punts the packet. Software (slow path) implements the required OAM mechanism. Timestamp is not carried in the packet forwarded to the next hop. 1. 4.1.2.2, here it must be N2 (page 10) If the target SID is not locally programmed, N4 responses with the ICMPv6 message (Type: "SRv6 OAM (TBA)", Code: "SID not locally implemented (TBA)"); otherwise a success is returned. 1. 4.1.2.2, here it must be B:4:C52 (page 11) The ICMPv6 process at node N4 checks if its local SID (B:2:C31) is locally programmed or not and responds to the ICMPv6 Echo Request. 1. 4.3.2.2, here it must be B:4:C52 (page 16) The traceroute process at node N4 checks if its local SID (B:2:C31) is locally programmed. 5) in below two cases is it B5:: or it must be A:5:: ? > ping A:5:: via segment-list B:2:C31, B:4:C52 Sending 5, 100-byte ICMP Echos to B5::, timeout is 2 seconds: !!!!! > traceroute A:5:: via segment-list B:2:C31, B:4:C52 Tracing the route to B5:: Thanks Rajesh Juniper Internal --_000_BYAPR05MB48219486CC62D9DAD4F613DEBE570BYAPR05MB4821namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Please find few comments on this draft

 

  1. Section 3.1.1 , below must be Ref2

 

Ref1: Hardware (microcode) just punts the packet. Software = (slow path)

implements the required = OAM

mechanism. Timestamp is = not carried in the packet forwarded to the

next hop.

 

  1. 4.1.2.2, here it= must be N2 (page 10)

 

If the target SID is not= locally programmed, N4 responses with

the ICMPv6 message (Type= : "SRv6 OAM (TBA)", Code: "SID not

locally implemented (TBA= )"); otherwise a success is returned.

 

  1. 4.1.2.2, here it= must be B:4:C52 (page 11)

The ICMPv6 process at no= de N4

checks if its local SID = (B:2:C31) is locally programmed or = not

and responds to the ICMP= v6 Echo Request.

 

  1. 4.3.2.2, here it= must be B:4:C52 (page 16)

The traceroute process at

node N4 checks if its local SID (B:2:C31) is locally

programmed.

 

5)  in below two cases is it B5:: or it must be= A:5:: ?

> ping A:5:: via segment-list B:2:C31, B:= 4:C52

Sending 5, 100-byte ICMP Echos to B5::, timeout is 2 seconds:

!!!!!

 

> traceroute A:5:: via segment-list B:2:C= 31, B:4:C52

Tracing the route to B5::

 

Thanks

Rajesh

 


Juniper Interna= l

--_000_BYAPR05MB48219486CC62D9DAD4F613DEBE570BYAPR05MB4821namp_-- From nobody Wed Apr 3 09:24:45 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F8B01203EC; Wed, 3 Apr 2019 09:24:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bXvcsD3TDdc7; Wed, 3 Apr 2019 09:24:41 -0700 (PDT) Received: from orange.com (mta135.mail.business.static.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E93A8120344; Wed, 3 Apr 2019 09:24:40 -0700 (PDT) Received: from opfednr03.francetelecom.fr (unknown [xx.xx.xx.67]) by opfednr22.francetelecom.fr (ESMTP service) with ESMTP id 44ZBHW1yZXzykR; Wed, 3 Apr 2019 18:24:39 +0200 (CEST) Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.51]) by opfednr03.francetelecom.fr (ESMTP service) with ESMTP id 44ZBHW0xcSzDq7T; Wed, 3 Apr 2019 18:24:39 +0200 (CEST) Received: from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBM22.corporate.adroot.infra.ftgroup ([fe80::954c:232a:f07d:25af%21]) with mapi id 14.03.0439.000; Wed, 3 Apr 2019 18:24:39 +0200 From: To: SPRING WG CC: "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AdTZy1D2mUjAURp0TKqNc4AXeLzDEgQbj5yg Date: Wed, 3 Apr 2019 16:24:38 +0000 Message-ID: <32111_1554308679_5CA4DE47_32111_184_1_53C29892C857584299CBF5D05346208A48A5EAC3@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48A5EAC3OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2019 16:24:44 -0000 --_000_53C29892C857584299CBF5D05346208A48A5EAC3OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable As a contributor, I'm not aware of non-disclosed IPR. --Bruno From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Wednesday, March 13, 2019 7:50 PM To: SPRING WG Cc: draft-filsfils-spring-srv6-network-programming@ietf.org Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programmi= ng Hi authors, SPRING WG, In parallel to the call for adoption for draft-filsfils-spring-srv6-network= -programming (1), we would like to poll for IPR. If you are aware of IPR that applies to draft-filsfils-spring-srv6-network-= programming please respond to this email. If you are aware of IPR, please indicate whether it has been disclosed in a= ccordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more = details). If you are an *author or contributor* please respond to this email regardle= ss of whether or not you're aware of any IPR. If you are not an author or contributor, please explicitly respond only if = you are aware of IPR that has not yet been disclosed. This document will not advance into the working group until IPR confirmatio= ns have been received from all authors and contributors. Thank you, (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-program= ming-07 --Bruno & Rob. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48A5EAC3OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

As a contributor, I’m not aware of non-disclosed IPR.

 

--Bruno

 

= From: spring [mailto:spring-bounces@ietf.org] On= Behalf Of bruno.decraene@orange.com
Sent: Wednesday, March 13, 2019 7:50 PM
To: SPRING WG
Cc: draft-filsfils-spring-srv6-network-programming@ietf.org
Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-pr= ogramming

 

Hi authors, SPRING WG,
 
In parallel to the call for adoption for draft-filsfils-sprin=
g-srv6-network-programming (1), we would like to poll for IPR.
 
If you are aware of IPR that applies to draft-filsfils-spring=
-srv6-network-programming please respond to this email.

If you are aware of IPR, please indicate whether it has been =
disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378=
 provide more details).


 


If you are an *author or contributor* please respond to this =
email regardless of whether or not you're aware of any IPR.


If you are not an author or contributor, please explicitly re=
spond only if you are aware of IPR that has not yet been disclosed.


 


This document will not advance into the working group until I=
PR confirmations have been received from all authors and contributors.=



 


Thank you,


 


(1)  <=
/span>https://tools.ietf.org/html/draft-filsfils-spring-=
srv6-network-programming-07


 


 


--Bruno & Rob.


=
 


_________________________________________=
___________________________________________________________________________=
_____


 


Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c


pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler


a l'expediteur et le detruire ainsi que l=
es pieces jointes. Les messages electroniques etant susceptibles d'alterati=
on,


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


 


This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;


they should not be distributed, used or c=
opied 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 l=
iable for messages that have been modified, changed or falsified.


Thank you.


______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
--_000_53C29892C857584299CBF5D05346208A48A5EAC3OPEXCAUBM43corp_-- From nobody Wed Apr 3 14:26:35 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 78F35120048; Wed, 3 Apr 2019 14:26:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eu8ucWPnPr3r; Wed, 3 Apr 2019 14:26:22 -0700 (PDT) Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EBD7612018E; Wed, 3 Apr 2019 14:26:21 -0700 (PDT) Received: by mail-ot1-x333.google.com with SMTP id u15so344879otq.10; Wed, 03 Apr 2019 14:26:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=5Gp69vhJOgHZGy+Z5wAJBcn6AYIHehNWpbpQ31+R4Os=; b=A1oOokS3awow8LNvRHAQmf0lxeksA5WRiaS3aNCRb27LQWuuNvqH1B0hv/29DnNfWx eXM/+SVRkC765N2B333Vjp7J2GQGyAsXJhijM1x10wIw1yh3h13HIN7iyqodJXXI6Qf+ LtBJ5ePUFEwj6+f/23tnfX+AlXHmBX/RtJZ6KpmGvMNcj7jOmCAGuYoYHt1qbtHBQy9X LR74HlwM+Vjrw9XNnL1eF8yfpKPPE8UCMbR/Fb6aJ8fc/DtOvtdP3zY+jsmC7T3UeK8p FUcTeR/eH3C9OCBTi+JuBbUQX8daCls0iITS2MaD+MLyC2QFscW+Ac3ocQ72Q4vaMNA8 iTYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=5Gp69vhJOgHZGy+Z5wAJBcn6AYIHehNWpbpQ31+R4Os=; b=Mr0Y5roOmwkua+tBeAQXZ765f707sDGz638NrG1f72imfQYRv4cAb8bdcCPe7SwllA LYm2UBHxG68xtnTnbPHe0GAm/e4o0FNQlIJYdEyXzbKT3mbQXxQQHmZOAj7y7J5FNAsA DoHaBDsbOql3AGBhvEI5T4oSNfW/XeXvmlHxWUCUewXE3enqQxRQFoYdOq1eAD1i3B9l 2fY8WyHxpFBl2uuHRk4HbRKGd+/S4+8ZN0jBe0CaH0K/0YMFVzH9S1Yh//e8WMGiUGPC hOVyK2rhD/QGRqYlYrGpbgb1CrGLFK0em0OFLtD/E30Coh56LOW9hKschX7L9P6jc+qD 8Tfw== X-Gm-Message-State: APjAAAXFVkSyJ8vchOCUSgIV8xN9f0+y/axdtxfUDKsGBPPlr6esX1/q ZImhl8I2ysj1eksWOM/jPQeLYt1LCmhTdVoTn+7NpA== X-Google-Smtp-Source: APXvYqwrkn+w+trwBVXQaluhdUIVbm8ildKFwIpqAyK1nWSozEl+6+b7qjb+B9XA3HJKoBEND7zGtMIpUoRHIzgI2bo= X-Received: by 2002:a9d:30d8:: with SMTP id r24mr1581410otg.100.1554326781184; Wed, 03 Apr 2019 14:26:21 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 3 Apr 2019 14:26:20 -0700 From: Alvaro Retana In-Reply-To: <155430903908.22744.16152379367225417415.idtracker@ietfa.amsl.com> References: <155430903908.22744.16152379367225417415.idtracker@ietfa.amsl.com> MIME-Version: 1.0 Date: Wed, 3 Apr 2019 14:26:20 -0700 Message-ID: To: SPRING WG Cc: Susan Hares , idr-chairs@ietf.org, draft-ietf-idr-bgpls-segment-routing-epe@ietf.org, idr@ietf.org Content-Type: multipart/alternative; boundary="000000000000a851ba0585a6e72c" Archived-At: Subject: Re: [spring] Last Call: (BGP-LS extensions for Segment Routing BGP Egress Peer Engineering) to Proposed Standard X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2019 21:26:25 -0000 --000000000000a851ba0585a6e72c Content-Type: text/plain; charset="UTF-8" FYI... On April 3, 2019 at 12:30:39 PM, The IESG (iesg-secretary@ietf.org) wrote: The IESG has received a request from the Inter-Domain Routing WG (idr) to consider the following document: - 'BGP-LS extensions for Segment Routing BGP Egress Peer Engineering' 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 2019-04-17. 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 Segment Routing (SR) leverages source routing. A node steers a packet through a controlled set of instructions, called segments, by prepending the packet with an SR header. A segment can represent any instruction, topological or service-based. SR segments allow steering a flow through any topological path and service chain while maintaining per-flow state only at the ingress node of the SR domain. This document describes an extension to BGP Link State (BGP-LS) for advertisement of BGP Peering Segments along with their BGP peering node information so that efficient BGP Egress Peer Engineering (EPE) policies and strategies can be computed based on Segment Routing. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segment-routing-epe/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segment-routing-epe/ballot/ The following IPR Declarations may be related to this I-D: https://datatracker.ietf.org/ipr/2721/ https://datatracker.ietf.org/ipr/2611/ --000000000000a851ba0585a6e72c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
FYI...

On Apri= l 3, 2019 at 12:30:39 PM, The IESG (iesg-secretary@ietf.org) wrote:


The IESG has received a request from the Inter-Domain Routing WG (idr) = to
consider the following document: - 'BGP-LS extensions for Segment R= outing BGP
Egress Peer Engineering'
<draft-ietf-idr-bgpls-segment-routing-epe-18.txt> as Proposed S= tandard

The IESG plans to make a decision in the next few weeks, and solicits f= inal
comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 201= 9-04-17. 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


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

This document describes an extension to BGP Link State (BGP-LS) for
advertisement of BGP Peering Segments along with their BGP peering
node information so that efficient BGP Egress Peer Engineering (EPE)
policies and strategies can be computed based on Segment Routing.





The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segme= nt-routing-epe/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-idr-bgpl= s-segment-routing-epe/ballot/

The following IPR Declarations may be related to this I-D:

https://datatrack= er.ietf.org/ipr/2721/
https://datatrack= er.ietf.org/ipr/2611/





<= /body> --000000000000a851ba0585a6e72c-- From nobody Wed Apr 3 18:57:19 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C4B5C1201DA; Wed, 3 Apr 2019 18:57:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.199 X-Spam-Level: X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YG3pmdVofl6K; Wed, 3 Apr 2019 18:57:08 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F2EDA12013E; Wed, 3 Apr 2019 18:57:07 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id E0380EF7FB2268B11C06; Thu, 4 Apr 2019 02:57:05 +0100 (IST) Received: from DGGEMM424-HUB.china.huawei.com (10.1.198.41) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 4 Apr 2019 02:57:05 +0100 Received: from DGGEMM509-MBX.china.huawei.com ([169.254.9.31]) by dggemm424-hub.china.huawei.com ([10.1.198.41]) with mapi id 14.03.0415.000; Thu, 4 Apr 2019 09:56:56 +0800 From: Huzhibo To: Rajesh M , Huaimo Chen , "Wupeng (Baggio, NOS MKT)" CC: SPRING WG , "ipv6@ietf.org" Thread-Topic: draft-hu-rtgwg-srv6-egress-protection-00 Thread-Index: AdToURCIlFNiHt+mTky/O8Chqa34iACNoBdA Date: Thu, 4 Apr 2019 01:56:55 +0000 Message-ID: <06CF729DA0D6854E8C1E5121AC3330DFAE88052B@dggemm509-mbx.china.huawei.com> References: In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.219.232] Content-Type: multipart/alternative; boundary="_000_06CF729DA0D6854E8C1E5121AC3330DFAE88052Bdggemm509mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] draft-hu-rtgwg-srv6-egress-protection-00 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2019 01:57:11 -0000 --_000_06CF729DA0D6854E8C1E5121AC3330DFAE88052Bdggemm509mbxchi_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGkgUmFqZXNoOg0KICAgICBUaGVyZSBhcmUgZm91ciByZWFzb24gQW55Y2FzdCBhZGRyZXNzIGNh bm5gdCB3b3JrLg0KMTpJZiB1c2luZyBhbnljYXN0IGFkZHJlc3MsV2hlbiB0aGUgQUMgaW50ZXJm YWNlIG9mIGVncmVzcyBQRSBpcyBmYWlsdXJlLHRyYWZmaWMgd2lsbCBkZXRvdXIuDQoyOmlmIHVz aW5nIGFueWNhc3QgYWRkcmVzcyxUaGUgb3ZlcmxheSBwYXRoIGlzIGxpbWl0ZWQgYnkgdGhlIHVu ZGVybGF5IHBhdGgsaWYgVlBOMSB3YW50cyB0byBwcmVmZXIgUEUxLFZQTjIgd2FudHMgdG8gcHJl ZmVyIFBFMi5JdCBjYW5uYHQgd29yay4NCjM6IGlmIHVzaW5nIGFueWNhc3QgYWRkcmVzcyxDRTEg aXMgY29ubmVjdCB0byBQRTEvUEUyLENFMiBpcyBjb25uZWN0IFBFMi9QRTOjrEl0IHdpbGwgYmUg aGFyZCB0byBkZXZlbG9wLg0KNDogaWYgdXNpbmcgYW55Y2FzdCBhZGRyZXNzLFBNIGlzIHVuYXZh aWxhYmxlLg0KDQpUaHMNClpoaWJvDQoNCkZyb206IFJhamVzaCBNIFttYWlsdG86bXJhamVzaEBq dW5pcGVyLm5ldF0NClNlbnQ6IE1vbmRheSwgQXByaWwgMDEsIDIwMTkgMjowOCBQTQ0KVG86IEh1 emhpYm8gPGh1emhpYm9AaHVhd2VpLmNvbT47IEh1YWltbyBDaGVuIDxodWFpbW8uY2hlbkBodWF3 ZWkuY29tPjsgV3VwZW5nIChCYWdnaW8sIE5PUyBNS1QpIDxiYWdnaW8ud3VwZW5nQGh1YXdlaS5j b20+DQpDYzogU1BSSU5HIFdHIDxzcHJpbmdAaWV0Zi5vcmc+OyBpcHY2QGlldGYub3JnDQpTdWJq ZWN0OiBkcmFmdC1odS1ydGd3Zy1zcnY2LWVncmVzcy1wcm90ZWN0aW9uLTAwDQoNCkhpIEFsbCwN Cg0KRWdyZXNzIHByb3RlY3Rpb24gY2FuIGJlIGFjaGlldmVkIHVzaW5nIEFueWNhc3QgYWRkcmVz cywgd2h5IHRoaXMgbmV3IHNvbHV0aW9uIGlzIHJlcXVpcmVkID8NCg0KVGhhbmtzDQpSYWplc2gN Cg0KDQoNCg0KSnVuaXBlciBJbnRlcm5hbA0K --_000_06CF729DA0D6854E8C1E5121AC3330DFAE88052Bdggemm509mbxchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi Rajesh:

     There = are four reason Anycast address cann`t work.

1:If using anycast address,When= the AC interface of egress PE is failure,traffic will detour.

2:if using anycast address,The = overlay path is limited by the underlay path,if VPN1 wants to prefer PE1,VP= N2 wants to prefer PE2.It cann`t work.

3: if using anycast address,CE1= is connect to PE1/PE2,CE2 is connect PE2/PE3=A3=ACIt will be hard to develop.

4: if using anycast address,PM = is unavailable.

 

Ths

Zhibo

 

From: Rajesh M [mailto:mrajesh@juniper.net]
Sent: Monday, April 01, 2019 2:08 PM
To: Huzhibo <huzhibo@huawei.com>; Huaimo Chen <huaimo.chen@= huawei.com>; Wupeng (Baggio, NOS MKT) <baggio.wupeng@huawei.com> Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org
Subject: draft-hu-rtgwg-srv6-egress-protection-00<= /p>

 

Hi All,

 

Egress protection can be achiev= ed using Anycast address, why this new solution is required ?

 

Thanks

Rajesh

 

 

 

Juniper Internal<= o:p>

--_000_06CF729DA0D6854E8C1E5121AC3330DFAE88052Bdggemm509mbxchi_-- From nobody Wed Apr 3 19:56:27 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F87612024C; Wed, 3 Apr 2019 19:56:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.199 X-Spam-Level: X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5aITrkn6lkT4; Wed, 3 Apr 2019 19:56:16 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 51DDC1201F3; Wed, 3 Apr 2019 19:56:16 -0700 (PDT) Received: from lhreml703-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id F1D84983972327B84CC3; Thu, 4 Apr 2019 03:56:12 +0100 (IST) Received: from DGGEMM405-HUB.china.huawei.com (10.3.20.213) by lhreml703-cah.china.huawei.com (10.201.108.44) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 4 Apr 2019 03:56:12 +0100 Received: from DGGEMM509-MBX.china.huawei.com ([169.254.9.31]) by DGGEMM405-HUB.china.huawei.com ([10.3.20.213]) with mapi id 14.03.0415.000; Thu, 4 Apr 2019 10:56:03 +0800 From: Huzhibo To: Rajesh M , "chenhn8.gd@chinatelecom.cn" , Huaimo Chen CC: SPRING WG , "ipv6@ietf.org" Thread-Topic: https://datatracker.ietf.org/doc/draft-chen-rtgwg-srv6-midpoint-protection/ Thread-Index: AdToYktjvVQ7dgnASmywRWtlRMTQkACLv/v0 Date: Thu, 4 Apr 2019 02:56:03 +0000 Message-ID: <06CF729DA0D6854E8C1E5121AC3330DFAE8815A0@dggemm509-mbx.china.huawei.com> References: In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.219.232] Content-Type: multipart/alternative; boundary="_000_06CF729DA0D6854E8C1E5121AC3330DFAE8815A0dggemm509mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] =?gb2312?b?tPC4tDogaHR0cHM6Ly9kYXRhdHJhY2tlci5pZXRmLm9y?= =?gb2312?b?Zy9kb2MvZHJhZnQtY2hlbi1ydGd3Zy1zcnY2LW1pZHBvaW50LXByb3RlY3Rp?= =?gb2312?b?b24v?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2019 02:56:18 -0000 --_000_06CF729DA0D6854E8C1E5121AC3330DFAE8815A0dggemm509mbxchi_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGkgUmFqZXNoOg0KDQoNCg0KICAgIFRoYW5rIHlvdSBmb3IgeW91ciBjb21tZW50cy5JdCBpcyBu b3QgMiAgdGltZXMgZmFpbHVyZSxCZWNhdXNlIHRoZSBsYXllci0zIGFkamFjZW5jeSBpbnRlcmZh Y2UgbWF5IGJlIHNhbWUgYXMgdGhlIHByaW1hcnkgaW50ZXJmYWNlIG9mIG5leHQgc2lkLg0KDQoN Cg0KVGhzDQoNClpoaWJvDQoNCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fDQq3orz+ yMs6IHNwcmluZyBbc3ByaW5nLWJvdW5jZXNAaWV0Zi5vcmddILT6se0gUmFqZXNoIE0gW21yYWpl c2g9NDBqdW5pcGVyLm5ldEBkbWFyYy5pZXRmLm9yZ10NCreiy83KsbzkOiAyMDE5xOo01MIxyNUg MTY6MjYNCsrVvP7IyzogY2hlbmhuOC5nZEBjaGluYXRlbGVjb20uY247IEh1emhpYm87IEh1YWlt byBDaGVuDQqzrcvNOiBTUFJJTkcgV0c7IGlwdjZAaWV0Zi5vcmcNCtb3zOI6IFtzcHJpbmddIGh0 dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5vcmcvZG9jL2RyYWZ0LWNoZW4tcnRnd2ctc3J2Ni1taWRw b2ludC1wcm90ZWN0aW9uLw0KDQpIaSBBbGwsDQoNClNlY3Rpb24gMi4zIEVuZHBvaW50IHggTm9k ZSBhcyBQTFINCg0KSGVyZSB3ZSBhcmUgaGFuZGxpbmcgMiAgdGltZXMgZmFpbHVyZSAoT25lIGxh eWVyLTMgYWRqYWNlbmN5IGludGVyZmFjZSBhbmQgYW5vdGhlciBwcmltYXJ5IGludGVyZmFjZSks IGluIGFsbCBvdGhlciBjYXNlcyB3ZSBvbmx5IGhhbmRsZSBvbmUgZmFpbHVyZS4NCkJldHRlciB0 byByZXN0cmljdCB0byBoYW5kbGluZyBvZiBvbmUgZmFpbHVyZS4NCg0KVGhhbmtzDQpSYWplc2gN Cg0KDQoNCkp1bmlwZXIgSW50ZXJuYWwNCg== --_000_06CF729DA0D6854E8C1E5121AC3330DFAE8815A0dggemm509mbxchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi Rajesh:<= /p>

 

   = Thank you for your comments.It is not 2  times failure,Because the la= yer-3 adjacency interface may be same as the primary interface of next sid.=

 

Ths

Zhibo

=B7=A2=BC=FE=C8=CB: spring [spring-bounces= @ietf.org] =B4=FA=B1=ED Rajesh M [mrajesh=3D40juniper.net@dmarc.ietf.org] =B7=A2=CB=CD=CA=B1=BC=E4: 2019=C4=EA4=D4=C21=C8=D5 16:26
=CA=D5=BC=FE=C8=CB: chenhn8.gd@chinatelecom.cn; Huzhibo; Huaimo Chen=
=B3=AD=CB=CD: SPRING WG; ipv6@ietf.org
=D6=F7=CC=E2: [spring] https://datatracker.ietf.org/doc/draft-chen-r= tgwg-srv6-midpoint-protection/

Hi All,

 

Section 2.3 Endpoint x Node as PLR

 


Juniper I= nternal

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Thanks, Gaurav ________________________________________ From: spring on behalf of bruno.decraene@orange.c= om Sent: Wednesday, March 13, 2019 2:50 PM To: SPRING WG Cc: draft-filsfils-spring-srv6-network-programming@ietf.org Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programmi= ng Hi authors, SPRING WG, In parallel to the call for adoption for draft-filsfils-spring-srv6-network= -programming (1), we would like to poll for IPR. If you are aware of IPR that applies to draft-filsfils-spring-srv6-network-= programming please respond to this email. If you are aware of IPR, please indicate whether it has been disclosed in a= ccordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more = details). If you are an *author or contributor* please respond to this email regardle= ss of whether or not you're aware of any IPR. If you are not an author or contributor, please explicitly respond only if = you are aware of IPR that has not yet been disclosed. This document will not advance into the working group until IPR confirmatio= ns have been received from all authors and contributors. Thank you, (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-program= ming-07 --Bruno & Rob. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Thu Apr 4 08:17:53 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46D26120368; Thu, 4 Apr 2019 08:17:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_SORBS_WEB=1.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KT49s62uRQ60; Thu, 4 Apr 2019 08:17:48 -0700 (PDT) Received: from smtp.uniroma2.it (smtp.uniroma2.it [160.80.6.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EE81B1200B5; Thu, 4 Apr 2019 08:17:46 -0700 (PDT) Received: from smtpauth.uniroma2.it (smtpauth.uniroma2.it [160.80.6.47]) by smtp-2015.uniroma2.it (8.14.4/8.14.4/Debian-8) with ESMTP id x34FHa6q013399 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 4 Apr 2019 17:17:41 +0200 Received: from [192.168.43.149] ([5.170.104.125]) (authenticated bits=0) by smtpauth.uniroma2.it (8.14.3/8.14.3/Debian-9.4) with ESMTP id x34FHVub028277 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 4 Apr 2019 17:17:32 +0200 To: bruno.decraene@orange.com, SPRING WG Cc: "draft-filsfils-spring-srv6-network-programming@ietf.org" References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: Stefano Salsano Message-ID: Date: Thu, 4 Apr 2019 17:17:30 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: it-IT Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.100.0 at smtp-2015 X-Virus-Status: Clean Archived-At: Subject: Re: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2019 15:17:51 -0000 I am not aware of any IPR that apply to this draft Stefano Salsano Il 2019-03-13 19:50, bruno.decraene@orange.com ha scritto: > Hi authors, SPRING WG, > > In parallel to the call for adoption for > draft-filsfils-spring-srv6-network-programming (1), we would like to > poll for IPR. > > If you are aware of IPR that applies to > draft-filsfils-spring-srv6-network-programming please respond to this email. > > If you are aware of IPR, please indicate whether it has been disclosed > in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 > provide more details). > > If you are an *author or contributor* please respond to this email > regardless of whether or not you're aware of any IPR. > > If you are not an author or contributor, please explicitly respond only > if you are aware of IPR that has not yet been disclosed. > > This document will not advance into the working group until IPR > confirmations have been received from all authors and contributors. > > Thank you, > > (1)https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07 > > --Bruno & Rob. > > _________________________________________________________________________________________________________________________ > > 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 ou 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 been modified, changed or falsified. > Thank you. > -- ******************************************************************* Stefano Salsano Professore Associato Dipartimento Ingegneria Elettronica Universita' di Roma Tor Vergata Viale Politecnico, 1 - 00133 Roma - ITALY http://netgroup.uniroma2.it/Stefano_Salsano/ E-mail : stefano.salsano@uniroma2.it Cell. : +39 320 4307310 Office : (Tel.) +39 06 72597770 (Fax.) +39 06 72597435 ******************************************************************* From nobody Fri Apr 5 02:43:53 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2393A120045; Fri, 5 Apr 2019 02:43:51 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?Mirja_K=C3=BChlewind_via_Datatracker?= To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.94.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?Mirja_K=C3=BChlewind?= Message-ID: <155445743113.13218.18348514276090549639.idtracker@ietfa.amsl.com> Date: Fri, 05 Apr 2019 02:43:51 -0700 Archived-At: Subject: [spring] =?utf-8?q?Mirja_K=C3=BChlewind=27s_No_Objection_on_draf?= =?utf-8?q?t-ietf-spring-segment-routing-mpls-19=3A_=28with_COMMENT=29?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2019 09:43:51 -0000 Mirja Kühlewind has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Given this document does not introduce any change in the MPLS data plane, I think it could also be published as informational. From nobody Mon Apr 8 03:20:17 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B83E1202CD; Mon, 8 Apr 2019 03:20:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.338 X-Spam-Level: X-Spam-Status: No, score=-1.338 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, KHOP_DYNAMIC=1.363, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JidqMWptOTg7; Mon, 8 Apr 2019 03:20:06 -0700 (PDT) Received: from mx0b-00273201.pphosted.com (mx0b-00273201.pphosted.com [67.231.152.164]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A22B712006D; 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Mon, 08 Apr 2019 03:20:03 -0700 Received: from BYAPR05MB4821.namprd05.prod.outlook.com (52.135.235.95) by BYAPR05MB3927.namprd05.prod.outlook.com (52.135.195.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1792.8; Mon, 8 Apr 2019 10:20:00 +0000 Received: from BYAPR05MB4821.namprd05.prod.outlook.com ([fe80::d14b:7cd7:72e7:ad6a]) by BYAPR05MB4821.namprd05.prod.outlook.com ([fe80::d14b:7cd7:72e7:ad6a%4]) with mapi id 15.20.1792.007; Mon, 8 Apr 2019 10:20:00 +0000 From: Rajesh M To: "gdawra.ietf@gmail.com" , "cfilsfil@cisco.com" , "ddukes@cisco.com" , "pbrisset@cisco.com" , "shsethur@cisco.com" , "pcamaril@cisco.com" CC: SPRING WG , "ipv6@ietf.org" Thread-Topic: draft-dawra-bess-srv6-services-00 (SRv6 BGP based Overlay services) Thread-Index: AdTt9Jzh0xr5tbY9TIeHlxsJlWk4Aw== Content-Class: Date: Mon, 8 Apr 2019 10:20:00 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.2.0.14 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=True; 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boundary="_000_BYAPR05MB4821621D34DA9F00C370DAADBE2C0BYAPR05MB4821namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: 505066cd-df56-46bd-52cc-08d6bc0bc22e X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Apr 2019 10:20:00.4929 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB3927 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-08_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=541 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904080094 Archived-At: Subject: [spring] draft-dawra-bess-srv6-services-00 (SRv6 BGP based Overlay services) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Apr 2019 10:20:08 -0000 --_000_BYAPR05MB4821621D34DA9F00C370DAADBE2C0BYAPR05MB4821namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi All, Why we need to set SRv6 Endpoint Behavior to Reserved value 0xFFFF ? I was thinking it must be (End.DX4 or End.DT4 or End.DX6 or End.DT6...etc) SRv6 Endpoint Behavior (2 octets): Encodes SRv6 Endpoint behavior defined in [I-D.filsfils-spring-srv6-network-programming]. This field MUST = be set to the Reserved value 0xFFFF. Thanks Rajesh Juniper Internal --_000_BYAPR05MB4821621D34DA9F00C370DAADBE2C0BYAPR05MB4821namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi All,

 

Why we need to set SRv6 Endpoint Behavior to Reserved value 0x= FFFF ?

I was thinking it must be (End.DX4 or End.DT4 or End.DX6 or End.DT6…etc= )

 

SRv6 Endpoint Behavior (2 octets= ): Encodes SRv6 Endpoint behavior

defined in [I-D.filsfils-spring-sr= v6-network-programming]. This = field MUST be set to the Reserved value 0xFFFF.

 

Thanks

Rajesh

 

 


Juniper Interna= l

--_000_BYAPR05MB4821621D34DA9F00C370DAADBE2C0BYAPR05MB4821namp_-- From nobody Tue Apr 9 14:09:21 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 75FAE120232; Tue, 9 Apr 2019 14:09:20 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Deborah Brungard via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Deborah Brungard Message-ID: <155484416040.19609.5671407101686670951.idtracker@ietfa.amsl.com> Date: Tue, 09 Apr 2019 14:09:20 -0700 Archived-At: Subject: [spring] Deborah Brungard's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Apr 2019 21:09:20 -0000 Deborah Brungard has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I didn't see a fix/response to one of Sasha's identified items in his RTG Dir review: - 1. The text in Section 1 states “An implementation MAY check that an IGP node-SID is not associated with a prefix that is owned by more than one router within the same routing domain, If so, it SHOULD NOT use this Node-SID, MAY use another one if available, and SHOULD log an error”. Sasha suggested MAY/s/SHOULD or MUST, saying this aligns with Section 3.2/RFC8402, which uses the wording "MUST NOT" be used by another router. I agree with Sasha, to align, it would be a "MUST", so why the softer requirement? Also, how does an implementation "check"? Wouldn't it be simply "An implementation MUST ensure that an.."? Or the operator (NMS) needs to ensure (e.g. RFC8402 says typically allocated by policy of the operator)? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Noting Mirja's comment asking why is this not Informational, I agree with the current track as "PS" as it does define (using RFC2119 keywords) procedures (labels). Nit: Section 2 I had difficulty parsing the first bullet: >From a control plane perspective, [RFC3031] does not mandate a single signaling protocol. Segment Routing makes use of various control plane protocols such as link state IGPs [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. The flooding mechanisms of link state IGPs fits very well with label stacking on ingress. Future control layer protocol and/or policy/configuration can be used to specify the label stack. /suggest/ From a control plane perspective, [RFC3031] does not mandate a single control protocol or use of a control protocol. Segment Routing makes use of various control plane protocols such as link state IGPs [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. The flooding mechanisms of link state IGPs fits very well with label stacking on ingress. Future control layer protocols are not precluded and/or management policy/configuration can be used to specify the label stack. 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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable Hi Rajesh, Thanks for noticing this. You are right that the Endpoint Behavior can be one of the corresponding values defined in network-programming draft - but only when the egress router wants to convey it to the ingress routers. Otherwise, it would be set to the Reserved value 0x= FFFF. We will clarify the above point in the next draft update. thanks=1B$B"c=1B(Bshyam From: Rajesh M Sent: Monday, April 8, 2019 3:20 AM To: gdawra.ietf@gmail.com; Clarence Filsfils (cfilsfil) ; Darren Dukes (ddukes) ; Patrice Brissette (pbrisset) <= pbrisset@cisco.com>; Shyam Sethuram (shsethur) ; Pablo = Camarillo (pcamaril) Cc: SPRING WG ; ipv6@ietf.org Subject: draft-dawra-bess-srv6-services-00 (SRv6 BGP based Overlay services= ) Hi All, Why we need to set SRv6 Endpoint Behavior to Reserved value 0xFFFF ? I was thinking it must be (End.DX4 or End.DT4 or End.DX6 or End.DT6=1B$B!D= =1B(Betc) SRv6 Endpoint Behavior (2 octets): Encodes SRv6 Endpoint behavior defined in [I-D.filsfils-spring-srv6-network-programming]. This field MUST = be set to the Reserved value 0xFFFF. Thanks Rajesh Juniper Internal --_000_BN6PR11MB3969975E391830991486780ED62E0BN6PR11MB3969namp_ Content-Type: text/html; charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable

Hi Rajesh,

Thanks for noticing this. You are right that the Endpoi= nt Behavior

can be one of the corresponding values defined in netwo= rk-programming

draft – but only when the egress router wants to = convey it

to the ingress routers. Otherwise, it would be set to t= he Reserved value 0xFFFF.

 

We will clarify the above point in the next draft updat= e.

 

thanks=1B$B"c=1B(= Bshyam

 

From: Rajesh M <mrajesh@juniper.net> Sent: Monday, April 8, 2019 3:20 AM
To: gdawra.ietf@gmail.com; Clarence Filsfils (cfilsfil) <cfilsfil= @cisco.com>; Darren Dukes (ddukes) <ddukes@cisco.com>; Patrice Bri= ssette (pbrisset) <pbrisset@cisco.com>; Shyam Sethuram (shsethur) <= ;shsethur@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com&= gt;
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org
Subject: draft-dawra-bess-srv6-services-00 (SRv6 BGP based Overlay s= ervices)

 

Hi All,

 

Why we need to set SRv6 Endpoint Behavior to Reserved value 0x= FFFF ?

I was thinking it must be (End.DX4 or End.DT4 or End.DX6 or End.DT6=1B$B!D=1B= (Betc)

 

SRv6 Endpoint Behavior (2 octets= ): Encodes SRv6 Endpoint behavior

defined in [I-D.filsfils-spring-sr= v6-network-programming]. This = field MUST be set to the Reserved value 0xFFFF.

 

Thanks

Rajesh

 

 

 

Juniper Internal=

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Brungard's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 08:07:06 -0000 SGVsbG8gRGVib3JhaCwNCg0KdGhhbmtzIGZvciB5b3VyIHJldmlldy4NClJlZ2FyZGluZyB5b3Vy IGRpc2N1c3MsIFNhc2hhIGhhZCBzYWlkOg0KSSBzZWUgdHdvIHBvc3NpYmlsaXRpZXMgdG8gcmVz b2x2ZSB0aGlzIGNvbnRyb3ZlcnN5OiBlaXRoZXIgbWFrZSB0aGUgDQpjaGVjayBpbiBxdWVzdGlv biBhIOKAnHJlYWwgcmVxdWlyZW1lbnTigJ0gKGkuZS4sIHJlcGxhY2UgTUFZIHdpdGggU0hPVUxE IG9yIA0KZXZlbiBNVVNUKSBvciBleHBsYWluIHdoeSBpdCBpcyBzYWZlIC4uLg0KU2FzaGEgd2Fz IHRodXMgcHJvcG9zaW5nIHMvTUFZL1NIT1VMRC8gb3Igcy9NQVkvTVVTVC8gYXMgdGhlIGZpcnN0 IG9wdGlvbi4NCg0KVGhlIGF1dGhvcnMgaGF2ZSBmb2xsb3dlZCBTYXNoYSBzdWdnZXN0aW9uLiBU aGUgdGV4dCBub3cgcmVhZHM6DQoNCkFuIGltcGxlbWVudGF0aW9uIFNIT1VMRCBjaGVjayB0aGF0 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Zy1leHRlbnNpb25zXSwNCj4gW0ktRC5pZXRmLW9zcGYtc2VnbWVudC1yb3V0aW5nLWV4dGVuc2lv bnNdIGFuZA0KPiBbSS1ELmlldGYtb3NwZi1vc3BmdjMtc2VnbWVudC1yb3V0aW5nLWV4dGVuc2lv bnNdLiBUaGUgZmxvb2RpbmcgbWVjaGFuaXNtcyBvZg0KPiBsaW5rIHN0YXRlIElHUHMgZml0cyB2 ZXJ5IHdlbGwgd2l0aCBsYWJlbCBzdGFja2luZyBvbiBpbmdyZXNzLiBGdXR1cmUgY29udHJvbA0K PiBsYXllciBwcm90b2NvbHMgYXJlIG5vdCBwcmVjbHVkZWQgYW5kL29yIG1hbmFnZW1lbnQgcG9s aWN5L2NvbmZpZ3VyYXRpb24gY2FuIGJlDQo+IHVzZWQgdG8gc3BlY2lmeSB0aGUgbGFiZWwgc3Rh Y2suDQo+IA0KPiANCj4gDQo= From nobody Wed Apr 10 01:20:13 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5FC3A1202CC for ; Wed, 10 Apr 2019 01:20:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, 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1.0 Archived-At: Subject: [spring] FW: IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 08:20:12 -0000 --_000_53C29892C857584299CBF5D05346208A48A75643OPEXCAUBM43corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 DQoNCkZyb206IERpcmsgU3RlaW5iZXJnIFttYWlsdG86ZGlya0BsYXBpc2hpbGxzLmNvbV0NClNl bnQ6IFdlZG5lc2RheSwgQXByaWwgMTAsIDIwMTkgMTA6MTQgQU0NClRvOiBERUNSQUVORSBCcnVu byBUR0kvT0xODQpDYzogd2ltLmhlbmRlcmlja3hAbm9raWEuY29tOyBzbXluYW1AaW5ub3ZpdW0u Y29tOyBhcnRoaUBhcmlzdGEuY29tOyBoYW5pLmVsbWFsa3lAZ21haWwuY29tOyBtYXNoYW93ZW5A Z21haWwuY29tOyBtc2hhcmlmQGJhcmVmb290bmV0d29ya3MuY29tOyBwcmVtQGJhcmVmb290bmV0 d29ya3MuY29tOyBzcHJpbmctY2hhaXJzQGlldGYub3JnOyBkcmFmdC1maWxzZmlscy1zcHJpbmct 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03:26:57 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BEAD21200E6; Wed, 10 Apr 2019 03:26:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5z7fEfi0IyrL; Wed, 10 Apr 2019 03:26:40 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2F690120099; Wed, 10 Apr 2019 03:26:40 -0700 (PDT) Received: from [172.22.5.136] (unknown [46.218.58.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 2EAD533F5AF; Wed, 10 Apr 2019 12:26:38 +0200 (CEST) To: xiong.quan@zte.com.cn Cc: pce@ietf.org, draft-xiong-pce-pcep-extension-sr-tp@ietf.org, gregory.mirsky@ztetx.com, "mpls@ietf.org" , "spring@ietf.org" References: <201904101547214513821@zte.com.cn> From: Loa Andersson Message-ID: Date: Wed, 10 Apr 2019 12:26:35 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <201904101547214513821@zte.com.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] =?utf-8?b?562U5aSNOiBTUi1NUExTLVRQOiBRdWVzdGlvbiBvbiBk?= =?utf-8?q?raft-xiong-pce-pcep-extension-sr-tp?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 10:26:43 -0000 Quan, I think you are right that this discussion will be of interest for the SPRING and MPLS working group. I have copied the working group mailing lists. On 2019-04-10 09:47, xiong.quan@zte.com.cn wrote: > > Hi Loa, > > > Thanks for your review and inspired comment! It is very important and > much appreciated. > > > Refer to your question, we proposed the terminology of the "SR-MPLS-TP" > in the following use case draft. > > https://datatracker.ietf.org/doc/draft-hu-mpls-sr-inter-domain-use-cases/ > > > > We plan to work on the definition and scope of SR-MPLS-TP and start > discussion in MPLS and SPRING working group next week. > > Welcome to review and discuss about that draft and provide suggestions > for SR-MPLS-TP! > > > Best Regards, > > Quan > > > > 原始邮件 > *发件人：*LoaAndersson > *收件人：*pce@ietf.org > ;draft-xiong-pce-pcep-extension-sr-tp@ietf.org > ; > *日 期 ：*2019年04月10日 03:55 > *主 题 ：**SR-MPLS-TP: Question on draft-xiong-pce-pcep-extension-sr-tp* > Authors, Working Group, > > MPLS-TP is defined as a network that: > >    "It MUST be possible to operate and configure the MPLS-TP data >     plane without any IP forwarding capability in the MPLS-TP data >     plane. (RFC 5654, section 2.3, requirement 36.)" > >     ... > >   "It MUST be possible to provide protection for the MPLS-TP data >    plane without any IP forwarding capability in the MPLS-TP data >    plane. (RFC 5654, section 2.5.1.1, requirement 63.)" > > In fact most MPLS-TP networks are deployed without IP in the data > plane. > > SR-MPLS on the other hand is a technology that is defined to USE > IGPs to distribute MPLS-labels, and thus requires IP in the data > plane. > > PCEP also runs over TCP/IP. > > The draft does not discuss this. I think this is needed, do you > have plans to do so? > > /Loa > -- > > > Loa Andersson                        email: loa@pi.nu > Senior MPLS Expert > Bronze Dragon Consulting             phone: +46 739 81 21 64 > > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Wed Apr 10 05:49:24 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E1EA120229; Wed, 10 Apr 2019 05:49:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ljR9MuDnGPy4; Wed, 10 Apr 2019 05:49:20 -0700 (PDT) Received: from ESA4-Dor.bell.ca (esa4-dor.bell.ca [204.101.223.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CCDA1120072; Wed, 10 Apr 2019 05:49:19 -0700 (PDT) Received: from dc5cmz-d01.bellca.int.bell.ca (HELO DG1MBX03-WYN.bell.corp.bce.ca) ([198.235.121.232]) by esa04corp-dor.bell.corp.bce.ca with ESMTP; 10 Apr 2019 08:49:18 -0400 Received: from DG1MBX04-WYN.bell.corp.bce.ca (2002:8eb6:120e::8eb6:120e) by DG1MBX03-WYN.bell.corp.bce.ca (2002:8eb6:120d::8eb6:120d) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 10 Apr 2019 08:49:18 -0400 Received: from DG1MBX04-WYN.bell.corp.bce.ca ([fe80::fcfa:23b8:45aa:1327]) by DG1MBX04-WYN.bell.corp.bce.ca ([fe80::fcfa:23b8:45aa:1327%22]) with mapi id 15.00.1473.003; Wed, 10 Apr 2019 08:49:18 -0400 From: "Voyer, Daniel" To: "bruno.decraene@orange.com" , SPRING WG CC: "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AQHU75vPDhYEX+/pM0ynauRjtVSWNg== Date: Wed, 10 Apr 2019 12:49:17 +0000 Message-ID: <393A9FBB-FF7F-4D73-B830-4DAB970793B8@bell.ca> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.17.1.190326 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted 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2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 87BD9120021; Wed, 10 Apr 2019 07:44:18 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <155490745854.22926.2113453616516042890.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 07:44:18 -0700 Archived-At: Subject: [spring] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ie?= =?utf-8?q?tf-spring-segment-routing-mpls-19=3A_=28with_COMMENT=29?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 14:44:19 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- It is time to publish this one. Nits ---- In section 2, "The flooding mechanisms of link state IGPs fits very well with label stacking on ingress" while I do not disagree with the statement, it is somehow out of the blue: either explain shortly why or delete the sentence if so obvious. Note: or even keep it like it is now. Section 2.5.1, binary numbers 100 and 110 should probably explicitly qualified as binary representations. Some typos in name or spacing in sections 6 and 7 From nobody Wed Apr 10 08:22:17 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 035211203AF; Wed, 10 Apr 2019 08:22:15 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: spring@ietf.org, ipr-announce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <155490973499.9301.4028883413554539797@ietfa.amsl.com> Date: Wed, 10 Apr 2019 08:22:15 -0700 Archived-At: Subject: [spring] IPR Disclosure Ciena Corporation' s Statement about IPR related to draft-cheng-spring-mpls-path-segment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 15:22:15 -0000 Dear Weiqiang Cheng, Lei Wang, Han Li, Mach Chen, Rakesh Gandhi, Royi Zigler, Shuangping Zhan: An IPR disclosure that pertains to your Internet-Draft entitled "Path Segment in MPLS Based Segment Routing Network" (draft-cheng-spring-mpls-path-segment) was submitted to the IETF Secretariat on and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/3492/). The title of the IPR disclosure is "Ciena Corporation's Statement about IPR related to draft-cheng-spring-mpls-path-segment" Thank you IETF Secretariat From ayyangar@gmail.com Wed Apr 10 07:01:52 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFC211205DD for ; Wed, 10 Apr 2019 07:01:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i4sCAm9tLEZ5 for ; Wed, 10 Apr 2019 07:01:50 -0700 (PDT) Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 97EAA1203B7 for ; Wed, 10 Apr 2019 07:01:49 -0700 (PDT) Received: by mail-lf1-x12e.google.com with SMTP id u21so1948686lfu.2 for ; Wed, 10 Apr 2019 07:01:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=A6z7TMeJ1UQvICzitVw51jXK5tgY05Uim/T5ohok38c=; b=IzB70KcUeb4IQzicPrncOBNq5p2sSSeDM8u/9GwCMGfymsnot4WONWgmOk6BPFbx1K t2LWZl53yqD2Tu4mmX3ajiBd1qgzkDI0nAeQeVf/15+YJXQIp7HrPx2aET2Pvn/++UY9 CNET3RHQr02MFkwgjM39Own5CVjP7Ag3TJ9FJZ9SQfrfeJufk3JQ3YIPnc70qTYAD6o+ 8kKAw3/iwSB3shbgm4pqBb4sdVjiy26zRwuVX9KY7UDtDmAti2g4vEK9gVZMaWJtFS5S elE6a8id3q5OG0tUic2LIwH9YXvm2pj7SoWPq3PssbPNre5SJVaPJYyIVJNowlY2U6Tz ZZIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=A6z7TMeJ1UQvICzitVw51jXK5tgY05Uim/T5ohok38c=; b=Eqbqfa4yDx+1BQ2Wb1vLEiUWEhJUFrMHJiQ/K0Cab7FgcnrjYmWAxWu1mmWCNDcwnl nPFmYq777v7cU4pgXpo/HzfWwmj5XSP/22HnquyO68MlY6tTnA0MPGDYFXJT7RTaiJBO t8rE6nMimPEsWOr5+X4trDAu0JKezu61/wDh31snpfhuc01HE0ynl5rNBnITJYckv73w jTN5LgaI35nHEanD3x5aRmceAfZsVqULPMPTVWHRNBCHp+jAV1p9hXgZ8l/QDTNRXH4G 5H0i1kI7JKZr4FBYHrpS+K1qbmA2lD58EUmieLczsA1CQxsUWcHMo++U3FUn734qULGy 1YMw== X-Gm-Message-State: APjAAAVRNYq/ncmP1hIYokVrNGFZuBMk4BBL67TFfE5dKCIzzp+rgrEH Dc7m3loeQSs/5PZNWW8E10dbFIFMxITuMYQkFS7QsVIVP7w= X-Google-Smtp-Source: APXvYqxtykzP5tdoQ8Os0MawIOjVnLntESFKhYWuLrJ2cnlk0PRCLUWA/0cneJ1QEEXaElXkIws47S7davVe5bkADC8= X-Received: by 2002:ac2:491e:: with SMTP id n30mr15363339lfi.13.1554904907332; Wed, 10 Apr 2019 07:01:47 -0700 (PDT) MIME-Version: 1.0 From: Arthi Ayyangar Date: Wed, 10 Apr 2019 16:01:36 +0200 Message-ID: To: SPRING WG Content-Type: multipart/alternative; boundary="000000000000a9418305862d82d0" Archived-At: X-Mailman-Approved-At: Wed, 10 Apr 2019 08:32:19 -0700 Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 15:23:49 -0000 --000000000000a9418305862d82d0 Content-Type: text/plain; charset="UTF-8" Sorry for the delay. I am not aware of any IPRs on this. thanks, Arthi *From:* spring [mailto:spring-bounces@ietf.org] *On Behalf Of * bruno.decraene@orange.com *Sent:* Wednesday, March 13, 2019 7:50 PM *To:* SPRING WG *Cc:* draft-filsfils-spring-srv6-network-programming@ietf.org *Subject:* [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming Hi authors, SPRING WG, In parallel to the call for adoption for draft-filsfils-spring-srv6-network-programming (1), we would like to poll for IPR. If you are aware of IPR that applies to draft-filsfils-spring-srv6-network-programming please respond to this email. If you are aware of IPR, please indicate whether it has been disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more details). If you are an *author or contributor* please respond to this email regardless of whether or not you're aware of any IPR. If you are not an author or contributor, please explicitly respond only if you are aware of IPR that has not yet been disclosed. This document will not advance into the working group until IPR confirmations have been received from all authors and contributors. Thank you, (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07 --Bruno & Rob. _________________________________________________________________________________________________________________________ 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 ou 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 been modified, changed or falsified. Thank you. _________________________________________________________________________________________________________________________ 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 ou 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 been modified, changed or falsified. Thank you. ---------- Forwarded message ---------- From: To: SPRING WG Cc: "draft-filsfils-spring-srv6-network-programming@ietf.org" < draft-filsfils-spring-srv6-network-programming@ietf.org> Bcc: Date: Wed, 13 Mar 2019 18:50:00 +0000 Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming Hi authors, SPRING WG, In parallel to the call for adoption for draft-filsfils-spring-srv6-network-programming (1), we would like to poll for IPR. If you are aware of IPR that applies to draft-filsfils-spring-srv6-network-programming please respond to this email. If you are aware of IPR, please indicate whether it has been disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more details). If you are an *author or contributor* please respond to this email regardless of whether or not you're aware of any IPR. If you are not an author or contributor, please explicitly respond only if you are aware of IPR that has not yet been disclosed. This document will not advance into the working group until IPR confirmations have been received from all authors and contributors. Thank you, (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07 --Bruno & Rob. _________________________________________________________________________________________________________________________ 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 ou 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 been modified, changed or falsified. Thank you. --000000000000a9418305862d82d0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
=

Sorry for the= delay.

I am not aware of any IPRs on this.


thanks,

Arthi


From= : spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@orange.com
Sent: Wednesday, March 13, 2019 7:50 PM
To: SPRING WG
Cc: draft-filsfils-spring-srv6-network-programming= @ietf.org
Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-pr= ogramming

=C2=A0

Hi authors, SPRING W=
G,
=C2=A0
In parallel to the c=
all for adoption for draft-filsfils-spring-srv6-network-programming (1), we=
 would like to poll for IPR.
=C2=A0
If you are aware of =
IPR that applies to draft-filsfils-spring-srv6-network-programming please r=
espond to this email.
If you are aware of =
IPR, please indicate whether it has been disclosed in accordance with IETF =
IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more details).

=C2=A0


If you are an *autho=
r or contributor* please respond to this email regardless of whether or not=
 you're aware of any IPR.


If you are not an au=
thor or contributor, please explicitly respond only if you are aware of IPR=
 that has not yet been disclosed.


=C2=A0


This document will n=
ot advance into the working group until IPR confirmations have been receive=
d from all authors and contributors.


=C2=A0


Thank you,

=C2=A0


(1)=C2=A0 https://tools.ietf.org/htm=
l/draft-filsfils-spring-srv6-network-programming-07


=C2=A0


=C2=A0


--Bruno & Rob.


=C2=A0


_________________________________________=
___________________________________________________________________________=
_____


=C2=A0


Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c


pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler


a l'expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d'=
alteration,


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


=C2=A0


This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;

they should not be distributed, used or c=
opied 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 l=
iable for messages that have been modified, changed or falsified.


Thank you.


______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
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---------- Forwarded message ----------
From:=C2=A0<bruno.decraene@or= ange.com>
To:=C2=A0SPRING WG <spring@ietf.org>
Cc:=C2=A0"draft-filsfils-spring-srv6-network-programming@ietf.org" <= ;draft-filsfils-spring-srv6-network-programming@ietf.org<= /a>>
Bcc:=C2=A0
Date:=C2=A0Wed, 13 Mar 2019 18:50:00 +0000
Subj= ect:=C2=A0[spring] IPR Poll for draft-filsfils-spring-srv6-network-programm= ing
Hi authors, SPRING WG,
=C2=A0
In parallel to the call for adoption for draft-fi=
lsfils-spring-srv6-network-programming (1), we would like to poll for IPR.<=
/span>
=C2=A0
If you are aware of IPR that applies to draft-fil=
sfils-spring-srv6-network-programming please respond to this email.<=
/pre>

If you are aware of IPR, please indicate whether =
it has been disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3=
669 and 5378 provide more details).


=C2=A0


If you are an *author or contributor* please resp=
ond to this email regardless of whether or not you're aware of any IPR.=



If you are not an author or contributor, please e=
xplicitly respond only if you are aware of IPR that has not yet been disclo=
sed.


=C2=A0


This document will not advance into the working g=
roup until IPR confirmations have been received from all authors and contri=
butors.


=C2=A0


Thank you,


=C2=A0


(1)=C2=A0 https://tools.ietf.org/htm=
l/draft-filsfils-spring-srv6-network-programming-07


=C2=A0


=C2=A0


--Bruno & Rob.


=C2=A0


______________________________________________________________________=
___________________________________________________

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

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

--000000000000a9418305862d82d0-- From nobody Wed Apr 10 08:47:23 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 44C031201B9 for ; Wed, 10 Apr 2019 08:47:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hu7SGdInlKj1 for ; Wed, 10 Apr 2019 08:47:18 -0700 (PDT) Received: from orange.com (mta241.mail.business.static.orange.com [80.12.66.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com 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<19106_1554911236_5CAE1004_19106_31_1_53C29892C857584299CBF5D05346208A48A76545@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <13382_1554883265_5CADA2C1_13382_350_3_53C29892C857584299CBF5D05346208A48A75495@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48A76545OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: [spring] FW: IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 15:47:21 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SMTP id c1mr16819457uan.71.1554916533559; Wed, 10 Apr 2019 10:15:33 -0700 (PDT) MIME-Version: 1.0 References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: From: Hani Elmalky Date: Wed, 10 Apr 2019 10:14:57 -0700 Message-ID: To: Stefano Salsano Cc: bruno.decraene@orange.com, SPRING WG , "draft-filsfils-spring-srv6-network-programming@ietf.org" Content-Type: multipart/alternative; boundary="000000000000a36cdb0586303739" Archived-At: Subject: Re: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 17:15:40 -0000 --000000000000a36cdb0586303739 Content-Type: text/plain; charset="UTF-8" I'm not aware of any IPR that apply to that draft. / Hani Elmalky On Thu, Apr 4, 2019 at 8:17 AM Stefano Salsano wrote: > I am not aware of any IPR that apply to this draft > > Stefano Salsano > > Il 2019-03-13 19:50, bruno.decraene@orange.com ha scritto: > > Hi authors, SPRING WG, > > > > In parallel to the call for adoption for > > draft-filsfils-spring-srv6-network-programming (1), we would like to > > poll for IPR. > > > > If you are aware of IPR that applies to > > draft-filsfils-spring-srv6-network-programming please respond to this > email. > > > > If you are aware of IPR, please indicate whether it has been disclosed > > in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 > > provide more details). > > > > If you are an *author or contributor* please respond to this email > > regardless of whether or not you're aware of any IPR. > > > > If you are not an author or contributor, please explicitly respond only > > if you are aware of IPR that has not yet been disclosed. > > > > This document will not advance into the working group until IPR > > confirmations have been received from all authors and contributors. > > > > Thank you, > > > > (1) > https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07 > > > > > --Bruno & Rob. > > > > > _________________________________________________________________________________________________________________________ > > > > 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 > ou 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 > been modified, changed or falsified. > > Thank you. > > > > > -- > ******************************************************************* > Stefano Salsano > Professore Associato > Dipartimento Ingegneria Elettronica > Universita' di Roma Tor Vergata > Viale Politecnico, 1 - 00133 Roma - ITALY > > http://netgroup.uniroma2.it/Stefano_Salsano/ > > > E-mail : stefano.salsano@uniroma2.it > Cell. : +39 320 4307310 > Office : (Tel.) +39 06 72597770 (Fax.) +39 06 72597435 > ******************************************************************* > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --000000000000a36cdb0586303739 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
=3D""I'm not aware of any= IPR that apply to that draft.

/ Hani Elmalky


On Thu, Apr 4, 2019 at 8:17 AM= Stefano Salsano <stefano= .salsano@uniroma2.it> wrote:
I am not aware of any IPR that apply to this draft

Stefano Salsano

Il 2019-03-13 19:50, bruno.decraene@orange.com ha scritto:
> Hi authors, SPRING WG,
>
> In parallel to the call for adoption for
> draft-filsfils-spring-srv6-network-programming (1), we would like to <= br> > poll for IPR.
>
> If you are aware of IPR that applies to
> draft-filsfils-spring-srv6-network-programming please respond to this = email.
>
> If you are aware of IPR, please indicate whether it has been disclosed=
> in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378
> provide more details).
>
> If you are an *author or contributor* please respond to this email > regardless of whether or not you're aware of any IPR.
>
> If you are not an author or contributor, please explicitly respond onl= y
> if you are aware of IPR that has not yet been disclosed.
>
> This document will not advance into the working group until IPR
> confirmations have been received from all authors and contributors. >
> Thank you,
>
> (1)https://tools.ietf.org= /html/draft-filsfils-spring-srv6-network-programming-07
>
> --Bruno & Rob.
>
> ______________________________________________________________________= ___________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations con= fidentielles 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 me= ssages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deform= e ou falsifie. Merci.
>
> This message and its attachments may contain confidential or privilege= d information that may be protected by law;
> they should not be distributed, used or copied without authorisation.<= br> > 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 = been modified, changed or falsified.
> Thank you.
>


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

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

E-mail=C2=A0 : stefano.salsano@uniroma2.it
Cell.=C2=A0 =C2=A0: +39 320 4307310
Office=C2=A0 : (Tel.) +39 06 72597770 (Fax.) +39 06 72597435
*******************************************************************

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--000000000000a36cdb0586303739-- From nobody Wed Apr 10 12:37:11 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9EE12120602; Wed, 10 Apr 2019 12:37:02 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Deborah Brungard via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Deborah Brungard Message-ID: <155492502256.22708.4211181034013069433.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 12:37:02 -0700 Archived-At: Subject: [spring] Deborah Brungard's No Objection on draft-ietf-spring-segment-routing-mpls-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 19:37:07 -0000 Deborah Brungard has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Noting Mirja's comment asking why is this not Informational, I agree with the current track "PS" as it defines (using RFC2119 keywords) SR-MPLS procedures for an MPLS dataplane. Section 2 (my previous Discuss point) - 1. The text in Section 1 states “An implementation SHOULD check that an IGP node-SID is not associated with a prefix that is owned by more than one router within the same routing domain. If so, it SHOULD NOT use this Node-SID, MAY use another one if available, and SHOULD log an error”. Sasha suggested MAY/s/SHOULD or MUST, saying MUST aligns with Section 3.2/RFC8402, which uses the wording "MUST NOT" be used by another router. While the document was changed to "SHOULD", my point was that I agreed with Sasha on this, to align with RFC8402, it needs to be a "MUST". Though reading later in RFC8402's Section 9 Manageability Considerations, I see it uses a "SHOULD". So I'll defer to the authors/working group on their preference. On my previous Discuss, I asked how does an implementation "check"? In RFC8402's Manageability Considerations, it says "In addition to the allocation policy/tooling that the operator will have in place, an implementation SHOULD protect the network in case of conflict detection by providing a deterministic resolution approach." So while I prefer RFC8402's more explicit operational guidance vs. "check", I'll defer to the authors. My concern is not so much for MPLS operators, this is nothing new, but to say something more accurate than "check" in an RFC. Nit (overall) I was surprised/disappointed there was no alignment on terminology with RFC8402. For example, RFC8402 defines terms for SR MPLS, e.g. SR-MPLS, but this document doesn't use any of RFC8402's defined MPLS terms. Suggestion at minimum a fix for the Abstract: Segment Routing (SR) leverages the source routing paradigm. /s/ Segment Routing (SR) leverages the source routing paradigm as defined in [RFC8402]. And: This document specifies the forwarding behavior to allow instantiating SR over the MPLS dataplane. /s/ This document specifies the forwarding behavior to allow instantiating SR over the MPLS dataplane (SR-MPLS). Nit: Section 2 I had difficulty parsing the first bullet: >From a control plane perspective, [RFC3031] does not mandate a single signaling protocol. Segment Routing makes use of various control plane protocols such as link state IGPs [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. The flooding mechanisms of link state IGPs fits very well with label stacking on ingress. Future control layer protocol and/or policy/configuration can be used to specify the label stack. /suggest/ From a control plane perspective, [RFC3031] does not mandate a single control protocol or use of a control protocol. Segment Routing makes use of various control plane protocols such as link state IGPs [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. Future control layer protocols are not precluded and/or management policy/configuration can be used to specify the label stack. From nobody Wed Apr 10 12:51:17 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 475171200CE; Wed, 10 Apr 2019 12:51:10 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Roman Danyliw via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Roman Danyliw Message-ID: <155492587028.22557.13362910200973971309.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 12:51:10 -0700 Archived-At: Subject: [spring] Roman Danyliw's No Objection on draft-ietf-spring-segment-routing-mpls-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 19:51:11 -0000 Roman Danyliw has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- (1) Section 1. Shouldn’t RFC8402 be “[RFC8402]”? (2) Section 1. First use of the acronym, but above there was no “Segment Routing (SR)”. (3) Section 2.1. Editorial. s/,…,etc/, etc./ (4) Section 2.4. The variable name in the text is “Size” and “size” in the equation. They should be consistent. (5) Section 2.4. Per Step #5 of the collision resolution procedure, could you please clarify what is a “non-zero algorithm”? (6) Section 2.5.1. Could you please clarify what “better administrative distance means”. Per the tie-breaking rules above, I assume you mean it is a lower administrative distance. (7) Section 2.5.1, for the sub-bullets under “The fields of each FEC are encoded as follows”, consider adding periods to the first two bullets: s/significant bits are set to zero/ significant bits are set to zero./ s/the numerical value for IPv6/the numerical value for IPv6./ (8) The Security Considerations references [RFC8402] to lay out the assumed trust model and a few of the possible implications (malicious looping, evasion of access control, hiding of the source of DoS attacks) if this model is violated. I concur on the language in the reference. I believe there are a few more things to explicitly point out: ** Per the implications, routing traffic through an observation point controlled by the attacker is another key privacy and integrity concern. ** Per the already stated implication, “malicious loop” feels too soft as the overall availability of the network can be affected (e.g., loops, slowing traffic down). FWIW, I’m not raising this to a DISCUSS because there is no normative language to address these issues, only additional proposed cautionary language of the threat. From nobody Wed Apr 10 13:25:27 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id CFD7A120165; Wed, 10 Apr 2019 13:25:19 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Alvaro Retana via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Alvaro Retana Message-ID: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 13:25:19 -0700 Archived-At: Subject: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 20:25:20 -0000 Alvaro Retana has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- (1) This first point is a cross-document DISCUSS. In short, the assumptions in this document about what an MCC is responsible for are not in line with the corresponding IGP drafts for OSPF [1][2] and IS-IS [3]. This misalignment must be resolved before any of these documents are published. [Note: I'll start a thread with the corresponding WGS, Authors, Shepherds, Chairs and ADs. Let's please discuss this point there.] This document uses the following definition in §2: "We call "MPLS Control Plane Client (MCC)" any control plane entity installing forwarding entries in the MPLS data plane. IGPs with SR extensions...are examples of MCCs." The focus of the IGP drafts is on the transport of the SR information, and not on other functions (see below). Which component is responsible for what is the point that needs clarification -- either in this document, the IGP drafts, or both. These are some specific cases: (1.1) §2.4 (Mapping a SID Index to an MPLS label): "The following rules MUST be applied by the MCC when calculating the MPLS label value corresponding the SID index value "I"." There's nothing in the IGP extension documents that point at this set of rules, and only a passing reference in the OSPF documents about outgoing labels. (1.2) §2.5 (Incoming Label Collision) also assumes more functions from an MCC than what the IGP documents do. For example: "Within an MCC, apply tie-breaking rules to select one FEC only and assign the label to it." (1.3) §2.8 also expects work by the IGPs: "the MCC is responsible for downloading the correct label value to FIB"...in this case not just calculating the label, but installing it in the FIB. (1.4) §2.10.1: "The method by which the MCC on router "R0" determines that PUSH or CONTINUE operation must be applied using the SID "Si" is beyond the scope of this document. An example of a method to determine the SID "Si" for PUSH operation is the case where IS-IS [I-D.ietf-isis-segment-routing-extensions]..." Note that the IS-IS draft (or the OSPF ones, for that matter) don't talk about how to determine the operation -- if that is out of scope of this document, then where is it specified? (1.5) From §2: An implementation SHOULD check that an IGP node-SID is not associated with a prefix that is owned by more than one router within the same routing domain. If so, it SHOULD NOT use this Node-SID, MAY use another one if available, and SHOULD log an error. rfc8402 reads (§3.2): "An IGP Node-SID MUST NOT be associated with a prefix that is owned by more than one router within the same routing domain." The text above is not in line with that (MUST NOT vs SHOULD). Also, how can "SHOULD check" be Normatively enforced? Both sentences above seem to be trying to specify a behavior for the IGPs. [1] https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions [2] https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions [3] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions (2) §2.5.1: According to §2.5, a "tie-breaking rule MUST be deterministic". However, the specification of the default rules are not: the first step uses the administrative distance, but the specification says that "the FEC types are ordered using the default administrative distance ordering defined by the implementation"...and later that the "user SHOULD ensure that the same administrative distance preference is used on all routers". The combination of different implementations and the lack of an absolute requirement to ensure consistency can easily be non-deterministic. This point is related to the text in §2.6 which talks about how "the ingress node MUST resolve" collisions the same way. Because of the lack of an absolute requirement for consistency, this "MUST" doesn't guarantee the same result. Also related is this text in §2.5.1: "All routers in a routing domain SHOULD use the same tie-breaking rules to maximize forwarding consistency." When would all routers not use the same rules? It seems to me that forwarding consistency is very important and would want to be maximized all the time. IOW, why not use MUST? I'm making this point a DISCUSS item because it is directly related to the ability of multiple implementations to interoperate. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- (1) §2.2: "A global segment MUST be a label, or an index which may be mapped to an MPLS label within the Segment Routing Global Block (SRGB)..." I don't think this sentence fragment is clear: the intent is surely to say that the global segment MUST be mapped within the SRGB (and not that it "MUST be a label"), right? Suggestion: s/A global segment MUST be a label, or an index which may be mapped/A global segment is a label, or an index which MUST be mapped (2) §2.5: "Suppose an anycast prefix...the advertisement of the prefix-SID by some, but not all, of advertising nodes SHOULD NOT be treated as a label collision." I'm not sure how the receiver knows if the SID was advertised "by some, but not all"...or even if the prefix is being used as anycast. Given the Normative language, please explain. IOW, please clarify the difference between a duplicate prefix-SID and an anycast prefix. The use of "SHOULD NOT" above seems to imply that there are cases when the situation should be treated as a label collision...what are those cases? (3) §2.5: "The remaining FECs with the default algorithm...are installed in the FIB...without any incoming labels..." What will these entries be used for? Given that we're talking about an MPLS network, there may be no traffic that matches the FEC (the traffic should be labeled)...if that is the case, then why install in the FIB at all? OTOH, if there is a possibility that unlabeled traffic is received, then this entry (meant for a different purpose) could be used...also not an ideal situation. §2.6 makes the case that in order "to minimize the chance of misforwarding, a FEC that loses its incoming label...MUST NOT be installed in FIB". This inconsistency adds strength to my questions above. (4) §2.5.1: "if more than one competing FEC remains after step 1, select the smallest numerical FEC value" What value? Are you referring to the FEC type (introduced later in this section)? If so, please be explicit and consistent. (5) §2.5.2.1: The illustration seems incomplete as the rules in §2.5.2 say that "the receiving instance MUST compute its local label", but in this case "B decides not to advertise any index". The second part of the example (in §2.5.2.2) seems to complete the scenario. It seems confusing to me that the first part shows an incomplete case...or am I misinterpreting the rules? (6) §2.7: "PUSH, NEXT, and CONTINUE...The specifications of these operations can be found in [RFC8402]. This sub-section specifies how to implement each of these operations in the MPLS forwarding plane." It seems contradictory that the specification is in two places... In any case, I think that this section is unnecessary as it doesn't seem to add anything from what rfc8402 already explains. (7) Nits... s/flooding mechanisms of link state IGPs fits/flooding mechanisms of link state IGPs fit s/to have a node segment to reach the node/to have a node segment reach the node s/per routing instance, topology, algorithm/per routing instance, topology, or algorithm s/except rule/except the rule s/local label serves/a local label serves s/subTLVs/sub-TLVs s/Remaining FECs/The remaining FECs s/installed in FIB/installed in the FIB s/lowest value SHOULD be/lowest value SHOULD be: s/SR Algorithm,)/SR Algorithm) From nobody Wed Apr 10 13:31:29 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 400A112032A; Wed, 10 Apr 2019 13:31:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.737 X-Spam-Level: X-Spam-Status: No, score=-1.737 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0Mp6qTjcN2yr; Wed, 10 Apr 2019 13:31:24 -0700 (PDT) Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EC2191203F5; Wed, 10 Apr 2019 13:31:11 -0700 (PDT) Received: by mail-ot1-x332.google.com with SMTP id d24so3147082otl.11; Wed, 10 Apr 2019 13:31:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:mime-version:date:message-id:subject:to:cc; bh=oq24BhDLPgV8miZroJLtTbjgp/ei5TB38OC/3YlVb/Q=; b=adQJ5aKjGe2TcOvpH2fyHaomfTk7J6aCxk2ObyMepvBISJe12Ur1Qn6F+keBr58tdz u2ffNBFD0OyQHLFmF3oTSuUQqmYRc/qqPd7eFArAgk4ePT46n8kzysLeV1ObrTpk0pCb lCZSHMnk+OjFiGiOZIytFsrsCLLW952BBC5LNps9upvW3E9IM31pKw8TJn4ekp5beW0b JjEiyc71+DpF/VwU9G2HHyRPoE+ol95gckssA4/+phP4hVOEFZYH/f+3J7hAXIfh8eMD oDXOUpzM/pFWnj0AFRcTN22ZgU8+D6Gl7Lu5d72nYhH8gFOT49lRwNnJeF1oggGpVa5a EO6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:mime-version:date:message-id:subject:to:cc; bh=oq24BhDLPgV8miZroJLtTbjgp/ei5TB38OC/3YlVb/Q=; b=q16kJ8b24T+sYnxpgEXliYYkUSoTgXLGBOuT08N82cE0RU6hArUoe2XEe3DaatkDFR VZNhvFtAkwItGBRmWJ7AP7wckMdBWtNvb8KeeC9P8acsVIRs18ftmb3QwUNyafnFGsRP m0Ue7haj1gp4gktaKzgQaYySnNx7dbi5OCnGwuoAqB+uQoAb+j/SogFBZkmMeiqss3+H roo1wPClbMJsUz79GeZ3jlOe/EswF+kvrp5bbWyn+bjyVbsmUwFXD+s2rGhGJlmuoGMu TcuYLEcXE4gIQJSgcgJI38bZOYcWfdtwM/21jOceGnepP1BfB1b/n7HMvoRafgMO2zX9 tSew== X-Gm-Message-State: APjAAAVEUd3zDlkUXYnCij+VELGOhBy/daT+P9/DEkuIli2mYj1VYvmO M49wf1K5oPINhba9YhNY2PiyAvBS7PrNGGa8nqfVTA== X-Google-Smtp-Source: APXvYqw1KDzlk0XSJH6ynN4VPMl9JkgsrfLdwDlymp8JQ+dbEvfg0Ly4JApfTlxI0Wkd7R4gDGuo3fqiDIniO+hH848= X-Received: by 2002:a05:6830:1103:: with SMTP id w3mr30807456otq.28.1554928270966; Wed, 10 Apr 2019 13:31:10 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 10 Apr 2019 13:31:10 -0700 From: Alvaro Retana MIME-Version: 1.0 Date: Wed, 10 Apr 2019 13:31:10 -0700 Message-ID: To: draft-ietf-spring-segment-routing-mpls.all@ietf.org, draft-ietf-ospf-segment-routing-extensions.all@ietf.org, draft-ietf-ospf-ospfv3-segment-routing-extensions.all@ietf.org, draft-ietf-isis-segment-routing-extensions.all@ietf.org Cc: SPRING WG , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000003e12b8058632f35b" Archived-At: Subject: [spring] Fwd: Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) (draft-ietf-ospf-segment-routing-extensions / draft-ietf-ospf-ospfv3-segment-routing-extensions / draft-ietf-isis-segment-routing-extensions) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 20:31:27 -0000 --0000000000003e12b8058632f35b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi! I just entered a DISCUSS position related to draft-ietf-spring-segment-routing-mpls (see below). I believe that the issue needs to be solved in conjunction with the IGP extension drafts, so I=E2=80=99m copying the authors/shepherds/chairs here. Thanks! Alvaro. On April 10, 2019 at 4:25:22 PM, Alvaro Retana via Datatracker ( noreply@ietf.org) wrote: ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- (1) This first point is a cross-document DISCUSS. In short, the assumptions in this document about what an MCC is responsible for are not in line with the corresponding IGP drafts for OSPF [1][2] and IS-IS [3]. This misalignment must be resolved before any of these documents are published. [Note: I'll start a thread with the corresponding WGS, Authors, Shepherds, Chairs and ADs. Let's please discuss this point there.] This document uses the following definition in =C2=A72: "We call "MPLS Cont= rol Plane Client (MCC)" any control plane entity installing forwarding entries in the MPLS data plane. IGPs with SR extensions...are examples of MCCs." The focus of the IGP drafts is on the transport of the SR information, and not on other functions (see below). Which component is responsible for what is the point that needs clarification -- either in this document, the IGP drafts, or both. These are some specific cases: (1.1) =C2=A72.4 (Mapping a SID Index to an MPLS label): "The following rule= s MUST be applied by the MCC when calculating the MPLS label value corresponding the SID index value "I"." There's nothing in the IGP extension documents that point at this set of rules, and only a passing reference in the OSPF documents about outgoing labels. (1.2) =C2=A72.5 (Incoming Label Collision) also assumes more functions from= an MCC than what the IGP documents do. For example: "Within an MCC, apply tie-breaking rules to select one FEC only and assign the label to it." (1.3) =C2=A72.8 also expects work by the IGPs: "the MCC is responsible for downloading the correct label value to FIB"...in this case not just calculating the label, but installing it in the FIB. (1.4) =C2=A72.10.1: "The method by which the MCC on router "R0" determines = that PUSH or CONTINUE operation must be applied using the SID "Si" is beyond the scope of this document. An example of a method to determine the SID "Si" for PUSH operation is the case where IS-IS [I-D.ietf-isis-segment-routing-extensions]..." Note that the IS-IS draft (o= r the OSPF ones, for that matter) don't talk about how to determine the operation -- if that is out of scope of this document, then where is it specified? (1.5) From =C2=A72: An implementation SHOULD check that an IGP node-SID is not associated with a prefix that is owned by more than one router within the same routing domain. If so, it SHOULD NOT use this Node-SID, MAY use another one if available, and SHOULD log an error. rfc8402 reads (=C2=A73.2): "An IGP Node-SID MUST NOT be associated with a p= refix that is owned by more than one router within the same routing domain." The text above is not in line with that (MUST NOT vs SHOULD). Also, how can "SHOULD check" be Normatively enforced? Both sentences above seem to be trying to specify a behavior for the IGPs. [1] https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions [2] https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensio= ns [3] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions --0000000000003e12b8058632f35b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Hi!

I just entered a DISCUSS position related to=C2=A0draft-ietf-spring-se= gment-routing-mpls (see below).=C2=A0 I believe that the issue needs to be = solved in conjunction with the IGP extension drafts, so I=E2=80=99m copying= the authors/shepherds/chairs here.
<= font face=3D"Helvetica">
Thanks!

Alvaro.

On April 10, 2019 at 4:25:22 PM, A= lvaro Retana via Datatracker (noreply@i= etf.org) wrote:

------------------------= ----------------------------------------------=C2=A0
DISCUSS:=C2=A0
--------------------------------------------------------------------= --=C2=A0

(1) This first point is a cross-document D= ISCUSS. In short, the assumptions in= =C2=A0
this document about what= an MCC is responsible for are not in line with the=C2=A0
correspond= ing IGP drafts for OSPF [1][2] and IS-IS [3]. This misalignment must=C2=A0
be resolved before any of these documents are published.=C2=A0

[Note: I'll start a thread with the corresponding= WGS, Authors, Shepherds,=C2=A0
Chairs and ADs. Let's please dis= cuss this point there.]=C2=A0<= /span>

This document uses th= e following definition in =C2=A72: "We call "MPLS Control Plane=C2=A0
Client (MCC)" any control plane entity installing forwardi= ng entries in the=C2=A0=
MPLS data plane. IGPs with SR extensions...a= re examples of MCCs."=C2=A0

The focus of the I= GP drafts is on the transport of the SR information, and not=C2=A0
o= n other functions (see below). Which component is responsible for what is t= he=C2=A0
point that needs clarification -- either in this document, = the IGP drafts, or=C2=A0
both.= =C2=A0

These a= re some specific cases:=C2=A0<= /span>

(1.1) =C2=A72.4 (Mapp= ing a SID Index to an MPLS label): "The following rules MUST be=C2=A0
applied by the MCC when calculating the MPLS label value correspondi= ng the SID=C2=A0
index value "I"." There's nothin= g in the IGP extension documents that point at=C2=A0
this set of rul= es, and only a passing reference in the OSPF documents about=C2=A0
o= utgoing labels.=C2=A0
(1.2) =C2=A72.5 (Incoming Lab= el Collision) also assumes more functions from an MCC=C2=A0
than wha= t the IGP documents do. For example: "Within an MCC, apply=C2=A0
tie-breaking rules to select one FEC only and assign the label to it.&qu= ot;=C2=A0

(1.3) =C2=A72.8 also expects work by the = IGPs: "the MCC is responsible for=C2=A0
downloading the correct= label value to FIB"...in this case not just calculating=C2=A0
= the label, but installing it in the FIB.=C2=A0

(1.4= ) =C2=A72.10.1: "The method by which the MCC on router "R0" = determines that PUSH=C2=A0
or CONTINUE operation must be applied usi= ng the SID "Si" is beyond the scope of=C2=A0
this document= . An example of a method to determine the SID "Si" for PUSH=C2=A0
operation is the case where IS-IS=C2=A0
[I-D.ietf-isis-segme= nt-routing-extensions]..." Note that the IS-IS draft (or=C2=A0
= the OSPF ones, for that matter) don't talk about how to determine the o= peration=C2=A0
-- if that is out of scope of this document, then whe= re is it specified?=C2=A0

(1.5) From =C2=A72:=C2=A0

An implementation SHOULD check that an IGP node-SI= D is not associated=C2=A0
with a prefix that is owned by more than o= ne router within the same=C2=A0
routing domain. If so, it SHOULD NOT= use this Node-SID, MAY use=C2=A0
another one if available, and SHOU= LD log an error.=C2=A0<= br style=3D"color:rgb(0,0,0);font-variant-caps:normal;letter-spacing:normal= ;text-align:start;text-indent:0px;text-transform:none;white-space:normal;wo= rd-spacing:0px">
rfc8402 reads (=C2=A73.2): &= quot;An IGP Node-SID MUST NOT be associated with a prefix=C2=A0
that= is owned by more than one router within the same routing domain." The= =C2=A0
= text above is not in line with that (MUST NOT vs SHOULD). Als= o, how can=C2=A0
"SHOULD check" be Normatively enforced?=C2=A0
Both sentences above seem to be trying to spec= ify a behavior for the IGPs.=C2=A0

[1]=C2=A0https://tools.ietf.org/html/draft-ietf-ospf-segment-rout= ing-extensions=C2= =A0
[2]=C2=A0
https://tools.ietf.org/html/draft-ietf-ospf-o= spfv3-segment-routing-extensions=C2=A0
[3]=C2=A0https://tools.ietf.org/html/draft-ietf-isis-segment-r= outing-extensions= =C2=A0
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[spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) (draft-ietf-ospf-segment-routing-extensions / draft-ietf-ospf-ospfv3-segment-routing-extensions / draft-ietf-isis-segment-routing-extensions) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 21:47:03 -0000 --_000_DB7PR07MB4999B1D9BE0BF5B459051F598C2E0DB7PR07MB4999eurp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 QWx2YXJvLA0KDQpUaGFua3MgZm9yIHlvdXIgcmV2aWV3LiBJ4oCZbSBub3Qgc3VyZSB3aGV0aGVy IEkgc2hvdWxkIHJlcGx5IGhlcmUgb3Igb24gdGhlIGllc2figJlzIGxpc3QuDQpJdCBsb29rcyB0 byBtZSB0aGF0IHlvdSBkb27igJl0IGRpc2FncmVlIHdpdGggd2hhdCBpcyB3cml0dGVuIGluIHRo ZSBkcmFmdCBidXQgcmF0aGVyIHdpdGggdGhlIGZhY3QgdGhhdCB0aGUgZHJhZnQgbWF5IHN1Z2dl 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--_000_DB7PR07MB4999B1D9BE0BF5B459051F598C2E0DB7PR07MB4999eurp_-- From nobody Wed Apr 10 14:51:34 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C2AD120343; Wed, 10 Apr 2019 14:51:31 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Warren Kumari via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Warren Kumari Message-ID: <155493309156.22771.9626354582064768080.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 14:51:31 -0700 Archived-At: Subject: [spring] Warren Kumari's No Objection on draft-ietf-spring-segment-routing-mpls-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 21:51:32 -0000 Warren Kumari has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for a well written / easy to understand document. I have a few suggestions / nits. Please note: If the WG has already discussed these, and come to other decisions, I'm fine with that... 1: "In order to have a node segment to reach the node, a network operator SHOULD configure at least one node segment per routing instance, topology, algorithm. " Perhaps: "segment per (routing instance, topology, algorithm)." (or "set of ..", or "combination of..." or something - not quite sure how best to word, but this seems slightly confusing). 2: "If the SRGB of a node does not conform to the structure specified in this section or to the previous two rules, then this SRGB MUST be completely ignored by all routers in the routing domain and the node MUST be treated as if it does not have an SRGB." Shouldn't this be logged somewhere? " The rules applicable to the SRGB are also applicable to the SRLB, except rule that says that the SRGB MUST only be used to instantiate global SIDs into the MPLS forwarding plane. The recommended, minimum, or maximum size of the SRGB and/or SRLB is a matter of future study" 3: I think there is a missing word(s) between 'except rule' - perhaps "for the"? 4: Missing period. 5: "For the purpose of incoming label collision resolution, a routing instance is identified by a single incoming label downloader to FIB." - is downloader the right word here? 6: "If the derived numerical value varies for the same configuration, then an implementation SHOULD make numerical value used to identify a routing instance configurable." This is a philosophical point, but it seems like I might always want to be able to configure this -- perhaps just "Implementations SHOULD make...? " 7: "This document defines the default tie breaking rules that SHOULD be implemented. An implementation MAY choose to support different tie-breaking rules and MAY use one of the these instead of the default tie-breaking rules. All routers in a routing domain SHOULD use the same tie-breaking rules to maximize forwarding consistency." Is there any reason not to require that all implementations implement these rules (mandatory to implement)? I don't want to end up in a situation where I buy boxes from Vendor X, and then cannot add Vendor Y, because they don't share a set of rules. 8: "R2 is the next-hop along the shortest path towards R8. By applying the steps in Section 2.8 the outgoing label downloaded to R1’s FIB corresponding to the global SID index 8 is 1008 because the SRGB of R2 is [1000,5000] as shown in Figure 2." - I was initially confused by the [1000,5000] as it isn't represented like this in the figure. Perhaps change either this text, or the text in the figure? From nobody Wed Apr 10 15:04:02 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id AA1FB1201BC; Wed, 10 Apr 2019 15:03:53 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <155493383368.22657.17493399361449567071.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 15:03:53 -0700 Archived-At: Subject: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 22:03:54 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- (pro forma) Six authors is more than five, which per RFC 7322 may require discussion. I have a few questions about whether we need to have more stringent or more specific requirements listed. In Section 2: An implementation SHOULD check that an IGP node-SID is not associated with a prefix that is owned by more than one router within the same routing domain. If so, it SHOULD NOT use this Node-SID, MAY use another one if available, and SHOULD log an error. While it's not entirely clear to me that we need to mandate checking (the "SHOULD check"), I have a hard time understanding why we would allow a known-bad SID to be used ("SHOULD NOT use this Node-SID"). Shouldn't that be a "MUST NOT", since using it could break the SR abstraction? In Section 2.5: 5. The remaining FECs with the default algorithm (see the specification of prefix-SID algorithm [RFC8402]) are installed in the FIB natively, such as pure IP entries in case of Prefix FEC, without any incoming labels corresponding to their SIDs. The remaining FECs with a non-zero algorithm are not installed in the FIB. I didn't really find where in RFC 8402 we assigned numerical values to the prefix-SID algorithms, such that "non-zero algorithm" was well-defined. Should I be looking somewhere else for this? In Section 2.5.1: I left several notes in the COMMENT section, but I think I can summarize the point to "it seems like we are defining a mapping from attributes of a given FEC/description to a byte string and applying an ordering to that byte string. But we don't fully specify how all the bits are encoded in that byte string, and it looks like we can end up with byte strings of a different length, so the comparison rule is not necessarily clear in that case." This seems fairly related to Alvaro's point (2). In Appendix A.1 | Local IGP SID allocated dynamically by R2 | | for its "north" adjacency to R3: 9001 | | for its "north" adjacency to R3: 9003 | | for its "south" adjacency to R3: 9002 | | for its "south" adjacency to R3: 9003 | 9003 is duplicated for different adjacencies? Isn't that a strongly disrecommended scenario? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- It seems that we're introducing something of a new concept in this document of "routing instance" as something with a numerical identifier. (That is, this does not appear in RFC 8402 or RFC 3031, in terms of what references I might expect to be in scope.) Am I just missing some other reference where this is introduced? If not, maybe it is worth mentioning in a terminology section. [I think some of these section-by-section notes were spotted already; I didn't get a chance to deduplicate.] Section 2 In order to have a node segment to reach the node, a network operator SHOULD configure at least one node segment per routing instance, topology, algorithm. [...] nit: maybe "per tuple of [...]"? Section 2.2 o The label value MUST be unique within the router on which the MCC is running. i.e. the label MUST only be used to represent the SID and MUST NOT be used to represent more than one SID or for any other forwarding purpose on the router. Maybe I'm misreading the intent, but "MUST be unique" seems like it's a requirement from core MPLS and need not be restated. Section 2.3 The rules applicable to the SRGB are also applicable to the SRLB, except rule that says that the SRGB MUST only be used to instantiate global SIDs into the MPLS forwarding plane. [...] nit: "except the rule" Section 2.4 I'd consider writing the algorithm in real code (python?) rather than abstract pseudocode. In some cases (though probably not here?) pseudocode makes it easy to miss edge cases that need to be specified in order for things to be interoperably implementable. Section 2.5 MPLS Architecture [RFC3031] defines Forwarding Equivalence Class (FEC) term as the set of packets with similar and / or identical characteristics which are forwarded the same way and are bound to the same MPLS incoming (local) label. In Segment-Routing MPLS, local label serves as the SID for given FEC. nit: there's some missing (in)definite articles here; "The MPLS Architecture", "the local label", "a given FEC". (And it probably reads better as "defines the term [FEC]" than putting "term" after the name of the term. o (Prefix, Routing Instance, Topology, Algorithm [RFC8402]), where a topology identifies a set of links with metrics. For the purpose of incoming label collision resolution, the same Topology numerical value SHOULD be used on all routers to identify the same set of links with metrics. [...] Is the IGP going to help me satisfy this SHOULD or is it more of a pie-in-the-sky sort of thing? Section 2.5.1 This document defines the default tie breaking rules that SHOULD be implemented. An implementation MAY choose to support different tie- breaking rules and MAY use one of the these instead of the default tie-breaking rules. All routers in a routing domain SHOULD use the same tie-breaking rules to maximize forwarding consistency. I didn't think through this hard enough to come up with a specific scenario that would fail, but it seems like there could be bad failure modes when forwarding consistency is not maintained. That would perhaps suggest a "MUST" requirement to use the same rules, and perhaps even announcement of an identifier for what rules are in use, so that peers can detect an inconsistency. The default FEC administrative distance order starting from the lowest value SHOULD be I think it would be nice if we could get this to be an "is" rather than a "SHOULD be", especially since at present we offer no guidance on actually constructing the required 8-bit numerical values. The numerical sort across FECs SHOULD be performed as follows: It seems like the first two top-level bullets here are not necessarily part of the procedure itself, but rather some ancillary information about how to compute values used as part of the procedure. I don't know if, editorially speaking, the presentation could be improved by reframing how these are discussed. o All prefixes are represented by (128 + 8) bits. . A prefix is encoded in the most significant bits and the remaining bits are set to zero. . The prefix length is encoded before the prefix in a field of size 8 bits. This description seems needlessly confusing. Couldn't we write it as (8+128) bits, and put the sub-bullet for the prefix length before the other sub-bullet, so that they appear in the order the bits are encoded? o Encode the remaining set of FECs as follows o Prefix, Routing Instance, Topology, Algorithm: (Prefix Length, Prefix, routing_instance_id, Topology, SR Algorithm,) o (next-hop, outgoing interface): (next-hop, outgoing_interface_id) o (number of adjacencies, list of next-hops in ascending numerical order, list of outgoing interface IDs in ascending numerical order). This encoding is used to encode a parallel adjacency [RFC8402] o (Endpoint, Color): (Endpoint_address, Color_id) o (IP address): This is the encoding for a mirror SID FEC. The IP address is encoded as described above in this section I think this needs to say a little bit more about what is being presented. The part before the colon is what we're using to label a category of FECs, and the part after the colon is how it is encoded? There might be a more formal description language to describe the encoding rules used, and also the (number of adjacencies, list of next-hops) bullet point doesn't have a colon. We also don't specify that big-endian (network byte order) is used. o Select the FEC with the smallest numerical value If I understand correctly, we are encoding these FECs to byte strings, but different types of FEC get encoded as different length byte strings. How do we then interpret these byte strings as numerical values? Section 2.6 However to minimize the chance of misforwarding, a FEC that loses its incoming label to the tie-breaking rules specified in Section 2.5 MUST NOT be installed in FIB with an outgoing segment routing label based on the SID corresponding to the lost incoming label. It's not entirely clear to me how actionable this requirement is. That is, is the entity instaslling the FIB entry always going to know that the outgoing label was "based on" the incoming (non-)label? Section 2.7.1 Setting TTL and TC improperly can have security considerations. This document does not discuss those, nor does RFC 8402 (the only reference listed from this document's security considerations). Section 4 "OAM" is not listed as "well-known" at https://www.rfc-editor.org/materials/abbrev.expansion.txt and would typically qualify for expansion on first usage. Section 5 [see also comment on Section 2.7.1] Should we mention that different routers can get different results from the tie-breaking rules in case of skew in IGP convergence? Appendix A.1 The packet arrives at router R2. Because the top label 1008 corresponds to the IGP SID "8", which is the prefix-SID attached to the prefix 192.0.2.8/32 owned by the node R8, then the instruction associated with the SID is "forward the packet using all ECMP/UCMP interfaces and all ECMP/UCMP next-hop(s) along the shortest/useable path(s) towards R8". Because R2 is not the penultimate hop, R2 applies the CONTINUE operation to the packet and sends it to R3 using one of the two links connected to R3 with top label 1008 as specified in Section 2.10.1. "one of the two links" seems inconsistent with the claimed "using all ECMP/UCMP interfaces and all ECMP/UCMP next-hop(s)". Because R3 is the penultimate hop, we assume that R3 performs penumtimate hop popping, which corresponds to the NEXT operation, then sends the packet to R8. [...] This chain of causality doesn't follow. We assume that R3 performs PHP -- the fact that in this flow R3 is the penultimate hope does not factor into that assumption. Appendix A.2.5 Since both FECs are from the same MCC, they have the same default admin distance. So we compare FEC type code-point. FEC1 has FEC type code-point=120, while FEC2 has FEC type code-point=130. Therefore, FEC1 wins. nit: It feels a little strange to call these code-points when there's no registry and they're locally assigned per site policy. Appendix A.2.6 FEC1 and FEC2 both use dynamic SID assignment. Since both FECs are from the same MCC, they have the same default admin distance. So we compare FEC type code-point. Both FECs have FEC type code-point=120. So we compare address family. Since IPv4 is preferred over IPv6, FEC1 wins. side note: It's a little surprising that "IPv4 is preferred over IPv6" did not get any objections at IETF LC. (Example 13 has the same property.) From nobody Wed Apr 10 15:06:03 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E9DB1202EE; Wed, 10 Apr 2019 15:05:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 31IqAaoK_A4p; Wed, 10 Apr 2019 15:05:52 -0700 (PDT) Received: from mail-oi1-x234.google.com (mail-oi1-x234.google.com [IPv6:2607:f8b0:4864:20::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F31F1201BC; Wed, 10 Apr 2019 15:05:52 -0700 (PDT) Received: by mail-oi1-x234.google.com with SMTP id y84so3147552oia.12; Wed, 10 Apr 2019 15:05:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=PXQuesc0DXVqgM34w1cckNk7TA0GfNs6ZgQJBdXf8LU=; b=uuWa0qpsNAVNGjZoDwMyxcOZs7KmGzjZfKyy+jwc8hPWMWge/s+Ila7RrENy6//36c HdSyEpbOKR8tJxGhuT5NOMVPWiM3iMjEMw5rNGBAtWKbCmibZGa0njOR3sYlhCIQSnuZ s1qTTEEf8U+65zBnfwyvsjOW5cHoiO3TAhr4xQJaaMNQVTis2qQetsPx+QTbQgMiHAR5 hE4dXjMaN9i13ARo3Oy8DYTHJMOMcBr7HTQEj1AlqjOILn4j3ZTx6aSGMsBgW7lOpkeg JTIH5iC1KiVIqcffs/Ujwt0J/PUbjFVAIk8YL/Ab90/yUnF8zM7fFi2BoVqG/m6TOOPH XgbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=PXQuesc0DXVqgM34w1cckNk7TA0GfNs6ZgQJBdXf8LU=; b=kyDszq8sTxJWioonYu05iKWzPUjp0aoKqYPY/M4smr4IhWZVeFvlSg6H2Q0Fn8D6f2 NCnmw0Egr+ymON4ZUk3mxt3ueo2Jl/oA5MAOnGO4tvE0naQuLcwzCL2nuTvIuEazoipD PpklngsuDqUYCvzTc56VwvYGLqzycdhoE1QEYAl/jwXRWdnMNjn9iu7xHnobX4dLOE91 C4TY91edRv8icwG6S45T7TVcVsIhWgovGqlWFLCZ1WuCAOr+9yMegR/1zsqxhEFxPUQy InvG34mEMpY0oNW8N0R2E7/3k/KTbjTKOlvsLGCOmb3sRcXHBsA75DpnJxSXRx/yrmvC BN3Q== X-Gm-Message-State: APjAAAUXrKxv+sldd1Oa6OFXtCptDgtY80llENPAXmkzofThQ3H8gvr+ yW32v9iWY13RWMpFsgAaa8UKa2cgklEn3u3n7u0YVA== X-Google-Smtp-Source: APXvYqwTNQfxF3kWonRvFnxavI4z9tWd3WxkoEdTLHvwBqC9m/GixkVJfMSSmx6IgkkXBH77wZ9/HoINm8pitCcPKkI= X-Received: by 2002:aca:b288:: with SMTP id b130mr3885601oif.154.1554933951570; Wed, 10 Apr 2019 15:05:51 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 10 Apr 2019 15:05:51 -0700 From: Alvaro Retana In-Reply-To: References: MIME-Version: 1.0 Date: Wed, 10 Apr 2019 15:05:50 -0700 Message-ID: To: "draft-ietf-ospf-ospfv3-segment-routing-extensions.all@ietf.org" , "draft-ietf-spring-segment-routing-mpls.all@ietf.org" , "draft-ietf-isis-segment-routing-extensions.all@ietf.org" , "draft-ietf-ospf-segment-routing-extensions.all@ietf.org" , "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" Cc: "lsr@ietf.org" , SPRING WG Content-Type: multipart/alternative; boundary="000000000000d5280c05863445a4" Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) (draft-ietf-ospf-segment-routing-extensions / draft-ietf-ospf-ospfv3-segment-routing-extensions / draft-ietf-isis-segment-routing-extensions) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 22:05:54 -0000 --000000000000d5280c05863445a4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On April 10, 2019 at 5:46:56 PM, Vigoureux, Martin (Nokia - FR/Paris-Saclay) (martin.vigoureux@nokia.com) wrote: Martin: Hi! It looks to me that you don=E2=80=99t disagree with what is written in the = draft but rather with the fact that the draft may suggest that IGPs should do things which are in fact not specified in the IGPs drafts. I think this point covers 1.1 to 1.4 Assuming that I=E2=80=99m correct, I believe that in order to clear the misunderstanding authors could simply remove the sentence: =E2=80=9CIGPs wi= th SR extensions...are examples of MCCs.=E2=80=9D. =E2=80=A6and probably clean up some other text, for example, =C2=A72.10.1 references I-D.ietf-isis-segment-routing-extensions specifically. Bottom line, I think you=E2=80=99re right. On 1.5. I don=E2=80=99t think there is a conflict. It does not contradict 8= 402. It is not saying =E2=80=9CAn IGP Node-SID SHOULD NOT be associated with a pref= ix =E2=80=A6=E2=80=9D The way I see it is that this is a belt and suspenders approach. The base req says MUST NOT and this req says =E2=80=9Ccheck if this req is respected= =E2=80=9D. I read this document as saying =E2=80=9Ccheck, but you may have reasons not= to=E2=80=9D=E2=80=A6 IMHO, there=E2=80=99s no reason to specify the behavior here again, if it= =E2=80=99s already specified in rfc8402. Of course this is only my view. I expect authors to have their own. I=E2=80=99m sure they will. ;-) Thanks! Alvaro. --000000000000d5280c05863445a4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
On April 10, 2019 at 5:46:56 PM, Vigoureux, Martin (Nok= ia - FR/Paris-Saclay) (martin= .vigoureux@nokia.com) wrote:

Martin:

Hi!

It l= ooks to me that you don=E2=80=99t disagree with what is written in the draf= t but rather with the fact that the draft may suggest that IGPs should do t= hings which are in fact not specified in the IGPs drafts. I think this poin= t covers 1.1 to 1.4

Assuming that I=E2=80= =99m correct, I believe that in order to clear the misunderstanding authors= could simply remove the sentence: =E2=80=9CIGPs with SR extensions...are examples of MCCs.<= /span>=E2=80=9D.

=E2=80=A6and probably clean up some ot= her text, for example, =C2=A72.10.1 references=C2=A0I-D.ietf-isis-segment-r= outing-extensions specifically.

Botto= m line, I think you=E2=80=99re right.

On 1.5. I don=E2=80=99t think there is a conflict.=C2=A0It d= oes not contradict 8402. It is not saying =E2=80=9CAn IGP Node-SID SHOULD N= OT be associated with a prefix =E2=80=A6=E2=80=9D

The way I see it is tha= t this is a belt and suspenders approach. The base req says MUST NOT and th= is req says =E2=80=9Ccheck if this req is respected=E2=80=9D.

I rea= d this document as saying =E2=80=9Ccheck, but you may have reasons not to= =E2=80=9D=E2=80=A6 =C2=A0IMHO, there=E2=80=99s no reason to specify the beh= avior here again, if it=E2=80=99s already specified in rfc8402.

<= div>

Of course this is only my view. I expect a= uthors to have their own.

<= p>I=E2=80=99m sure they will. ;-)

Thanks!

Alvaro.=

--000000000000d5280c05863445a4-- From nobody Wed Apr 10 16:40:18 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2C0A4120046; Wed, 10 Apr 2019 16:40:08 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Adam Roach via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Adam Roach Message-ID: <155493960817.22552.11610591624619755725.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 16:40:08 -0700 Archived-At: Subject: [spring] Adam Roach's No Objection on draft-ietf-spring-segment-routing-mpls-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2019 23:40:08 -0000 Adam Roach has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- §2.1: > The MCC in the network downloads > different MPLS labels/SIDs to the FIB for different forwarding > behaviors Please expand "FIB" on first use. From nobody Wed Apr 10 18:22:24 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B7DF1200DE; Wed, 10 Apr 2019 18:22:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.21 X-Spam-Level: X-Spam-Status: No, score=-2.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YYVMGpHMsw6h; Wed, 10 Apr 2019 18:22:20 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A56D8120075; Wed, 10 Apr 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nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0415.000; Thu, 11 Apr 2019 09:22:12 +0800 From: "Xiazhongqi (Sam, Router & Carrier Ethernet Solution Arch&Designing Department)" To: Hani Elmalky , Stefano Salsano CC: "bruno.decraene@orange.com" , SPRING WG , "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AQHU78/U9OJeil/cnkqymaoXbayjiaY2KeWw Date: Thu, 11 Apr 2019 01:22:11 +0000 Message-ID: <65B93B50C51B1545ACC5D6C98876241ABD83C077@NKGEML515-MBX.china.huawei.com> References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.183.173] Content-Type: multipart/alternative; boundary="_000_65B93B50C51B1545ACC5D6C98876241ABD83C077NKGEML515MBXchi_" MIME-Version: 1.0 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KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqPGJyPg0KPGJyPg0KX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX188YnI+DQpzcHJpbmcgbWFp bGluZyBsaXN0PGJyPg0KPGEgaHJlZj0ibWFpbHRvOnNwcmluZ0BpZXRmLm9yZyIgdGFyZ2V0PSJf YmxhbmsiPnNwcmluZ0BpZXRmLm9yZzwvYT48YnI+DQo8YSBocmVmPSJodHRwczovL21haWx0cmFj ay5pby90cmFjZS9saW5rLzI3ZDhmYTUyNWJlNjQ1MmE4OWNkZmNjYzFhOWExNDYzNjAwZDBlMjc/ dXJsPWh0dHBzJTNBJTJGJTJGd3d3LmlldGYub3JnJTJGbWFpbG1hbiUyRmxpc3RpbmZvJTJGc3By aW5nJmFtcDt1c2VySWQ9MzI3ODkzNyZhbXA7c2lnbmF0dXJlPWYwOTIxYjg1MWNiZWM4NTUiIHRh cmdldD0iX2JsYW5rIj5odHRwczovL3d3dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3Nwcmlu ZzwvYT48bzpwPjwvbzpwPjwvc3Bhbj48L3A+DQo8L2Jsb2NrcXVvdGU+DQo8L2Rpdj4NCjwvZGl2 Pg0KPC9ib2R5Pg0KPC9odG1sPg0K --_000_65B93B50C51B1545ACC5D6C98876241ABD83C077NKGEML515MBXchi_-- From nobody Wed Apr 10 18:35:39 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1ACD012048B; Wed, 10 Apr 2019 18:35:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Suresh Krishnan via Datatracker To: "The IESG" Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, shraddha@juniper.net, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Suresh Krishnan Message-ID: <155494652409.22561.10937455913008540408.idtracker@ietfa.amsl.com> Date: Wed, 10 Apr 2019 18:35:24 -0700 Archived-At: Subject: [spring] Suresh Krishnan's No Objection on draft-ietf-spring-segment-routing-mpls-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Apr 2019 01:35:30 -0000 Suresh Krishnan has entered the following ballot position for draft-ietf-spring-segment-routing-mpls-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- * Section 2 "including for TI-LFA". Add a reference to draft-bashandy-rtgwg-segment-routing-ti-lfa at first use? * Section 2.4 Calling "temp" something more descriptive would have been helpful (say base_index). * Section 2.5.1. "Address Family represented by 8 bits, where IPv4 encoded as 100 and IPv6 is encoded as 110." Suggest rewording to say IPv4 is represented by the value 4 and IPv6 is represented by the value 6 (unless you actually meant to use the decimal values 100 and 110, in which case ignore this comment). From nobody Wed Apr 10 20:38:42 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3A881201EE; Wed, 10 Apr 2019 20:38:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.21 X-Spam-Level: X-Spam-Status: No, score=-2.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AEDAPPOqDjgO; Wed, 10 Apr 2019 20:38:36 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7598D120104; Wed, 10 Apr 2019 20:38:36 -0700 (PDT) Received: from LHREML711-CAH.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id EE097D3A8CF5EA8201B6; Thu, 11 Apr 2019 04:38:33 +0100 (IST) Received: from NKGEML411-HUB.china.huawei.com (10.98.56.70) by LHREML711-CAH.china.huawei.com (10.201.108.34) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 11 Apr 2019 04:38:33 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml411-hub.china.huawei.com ([10.98.56.70]) with mapi id 14.03.0415.000; Thu, 11 Apr 2019 11:38:26 +0800 From: "Xiazhongqi (Sam, Router & Carrier Ethernet Solution Arch&Designing Department)" To: Hani Elmalky , Stefano Salsano CC: "bruno.decraene@orange.com" , SPRING WG , "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AQHU78/U9OJeil/cnkqymaoXbayjiaY2KeWwgAAmSpA= Date: Thu, 11 Apr 2019 03:38:26 +0000 Message-ID: <65B93B50C51B1545ACC5D6C98876241ABD83C19C@NKGEML515-MBX.china.huawei.com> References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.183.173] Content-Type: multipart/alternative; boundary="_000_65B93B50C51B1545ACC5D6C98876241ABD83C19CNKGEML515MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] =?utf-8?b?562U5aSNOiAgSVBSIFBvbGwgZm9yIGRyYWZ0LWZpbHNm?= =?utf-8?q?ils-spring-srv6-network-programming?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Apr 2019 03:38:40 -0000 --_000_65B93B50C51B1545ACC5D6C98876241ABD83C19CNKGEML515MBXchi_ Content-Type: text/plain; charset="utf-8" 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autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CbGknGdAPtrG; Thu, 11 Apr 2019 19:59:55 -0700 (PDT) Received: from mail-ot1-x336.google.com (mail-ot1-x336.google.com [IPv6:2607:f8b0:4864:20::336]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1330512046B; Thu, 11 Apr 2019 19:59:55 -0700 (PDT) Received: by mail-ot1-x336.google.com with SMTP id t8so7125837otp.7; Thu, 11 Apr 2019 19:59:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=yLqVC9ybTnFy9AMLCaS7V6RsOL6N2R3wh0X76uKjaBI=; b=cb6zUzf7k+1DDTLPGcmcgEzlIaNtob5GMQLgcRkE/QmFX51TNLem6+6J18Ss/u4u/y 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X-Google-Smtp-Source: APXvYqztB4mv33TB1xZcTVZwuS7eILsbHkVZ2I2dTQckI9S1+n8J4Gln12bxhB2D0NRlQoFWoEnl4M9T7FbI3CUWU9E= X-Received: by 2002:a9d:7ad9:: with SMTP id m25mr35808552otn.75.1555037994337; Thu, 11 Apr 2019 19:59:54 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Mark Smith Date: Fri, 12 Apr 2019 12:59:27 +1000 Message-ID: To: Robert Raszuk Cc: Robert Raszuk , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , lisp@ietf.org Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 02:59:56 -0000 Hi Robert, Sorry not to get back to you sooner. On Mon, 1 Apr 2019 at 01:40, Robert Raszuk wrote: > > Hi Mark, > > > Since you correctly observed that now SID can be 32 bit and that is similar to the size of IPv4 my fundamental question is why not use something which already exists instead of defining some sort of new from scratch ? > > It will be perfectly fine to have full proper SRv6 with SRH and LISP or Vector Routing as an alternative options. I really do not see a room or need for yet one more mapping plane. What problem does it solve which would not be already solved elsewhere ? > Well, there seems to be or have been concerns about the overhead of using 128 bit SIDs in IPv6. That seemed to be the motivation for EH insertion. I sympathise with the overhead concern, although I'd be quite happy to put up with the overhead and bandwidth costs of full IPv6-in-IPv6 tunnelling in comparison to non-commodity operations like inserting the SRH EH into existing IPv6 packets to avoid that overhead. Bandwidth is always getting cheaper. I think the value in using IPv6 as the transport for SR is that IPv6 is becoming and will be the future the commodity layer 3 protocol. MPLS may be fairly commodity, however IPv6 will be more so, and I think the reason is that it is an end-to-end protocol that hosts use (I think this is also why Ethernet has become the dominant link-layer protocol, even for WAN links). So if SR wants to benefit from and leverage IPv6's commodification, then it needs to be limited to commodity IPv6 operations. If it deviates, then it isn't commodity IPv6 any more. So my motivation for suggesting 32 bit SIDs in IPv6, and I'm guessing Ron's too for his smaller variable SIDs proposal including 32 bits, is to try to reduce the overhead of SR over IPv6, while also retaining commodity IPv6 operation. Regards, Mark. From nobody Thu Apr 11 20:21:28 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3DBF812003F; Thu, 11 Apr 2019 20:21:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wLsLDXEacglM; Thu, 11 Apr 2019 20:21:10 -0700 (PDT) Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1050412000F; Thu, 11 Apr 2019 20:21:10 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id p6so4470542pgh.9; Thu, 11 Apr 2019 20:21:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=sbx2F0+va19UWW1Udn3ZsqZB6LXf4tM8iBHSMhfY1a4=; b=odLsiNoZu7BUPuqNflTx7X2kyhCzOpbbKhPRUSIQkiw7vyKftc0nkFHTHisA+8PbZv A93cIl000XL/2ejdvCasdSkSMv4dy+ts/JQQYfWlQncdS5qAWgDq24rTa6SZvDamMbwx XJEvpbGX6z6T+lOfhPmSypVNZ33zKBly9/BTqtgt6dT9JyGobz4ExI7zFPoTyqZhjf3U kmVQd5vFsJhxDWCFtqZ4NgqSO+MRqrL7XmkRpUt8ZLQclULfsQB8qPK4mRK/Begp+0m7 yhrCkQjd9Ld485V9ZVRTX9WvA1DjIjwZedbXrnuWYe/lP/adYpljJBDv4kz4o8Oe5L7y Mopw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=sbx2F0+va19UWW1Udn3ZsqZB6LXf4tM8iBHSMhfY1a4=; b=amdETb5qRgt9H08VOJCpTKRW+GdkMShb2w2cX6SlpfHy7ZcXV+X37sWeTACGSH+f1h bKyjrKeAvEDuPn0S7bGPiXlR2oqm47RlopoDvrRUJCaSuxaWl8zs+dDnKNYma9kia+VU Bcz/KWsHhCJtKp4jq7u14B9awTMd3m9NU4RtQY7JMRKa1eT+hYutheVdlpUQY1axG0s8 Jr2aAvpY6f8dmVYsRVcNlsZW9BEWFMu+R4w12iOqzO31a85O2ZY/tVqkllTCZ4G/Atjx 9gkYdb9Y6puZbodbfGDZa5fVdS9p46PVmWc21/5cMfZHSXgvSBHEHGpNqNxsI8DqomFD 1YPw== X-Gm-Message-State: APjAAAVHZ4wz3ay3/jsMOxO/dl2AeJM7VhXVITrKHrJYBtJkcoM2IQPS HcHyf6MniyJtXTihNzdCYmaAzb+Z X-Google-Smtp-Source: APXvYqwBAXBvuRX2hMF3QFD2VJxgi+pQ7TGkAQqJHN0/viveFZtGz+QMWMdt38SVUpSMJP7oLOODag== X-Received: by 2002:aa7:8c84:: with SMTP id p4mr54610982pfd.164.1555039269195; Thu, 11 Apr 2019 20:21:09 -0700 (PDT) Received: from ?IPv6:2601:646:9600:e494:d8a:730f:c589:c301? ([2601:646:9600:e494:d8a:730f:c589:c301]) by smtp.gmail.com with ESMTPSA id g4sm10009758pfc.75.2019.04.11.20.21.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 20:21:07 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) From: Dino Farinacci X-Mailer: iPhone Mail (16E227) In-Reply-To: Date: Thu, 11 Apr 2019 20:21:06 -0700 Cc: Robert Raszuk , Robert Raszuk , SPRING WG , "ipv6@ietf.org" , lisp@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <95D431A8-12BF-4025-9A50-5A5580EAD0F7@gmail.com> References: To: Mark Smith Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 03:21:12 -0000 So it looks like SR is either turning out to be like LISP or BIER, or both. S= o where is the unique value? The next step is you=E2=80=99ll need a control plane (where discussions have= begun) where it makes SR even more like LISP and support for multicast (whe= re discussions have begun) where it makes SR even more like BIER.=20 Dino > On Apr 11, 2019, at 7:59 PM, Mark Smith wrote: >=20 > Hi Robert, >=20 > Sorry not to get back to you sooner. >=20 >> On Mon, 1 Apr 2019 at 01:40, Robert Raszuk wrote: >>=20 >> Hi Mark, >>=20 > >>=20 >> Since you correctly observed that now SID can be 32 bit and that is simil= ar to the size of IPv4 my fundamental question is why not use something whic= h already exists instead of defining some sort of new from scratch ? >>=20 >> It will be perfectly fine to have full proper SRv6 with SRH and LISP or V= ector Routing as an alternative options. I really do not see a room or need f= or yet one more mapping plane. What problem does it solve which would not be= already solved elsewhere ? >>=20 >=20 > Well, there seems to be or have been concerns about the overhead of > using 128 bit SIDs in IPv6. That seemed to be the motivation for EH > insertion. >=20 > I sympathise with the overhead concern, although I'd be quite happy to > put up with the overhead and bandwidth costs of full IPv6-in-IPv6 > tunnelling in comparison to non-commodity operations like inserting > the SRH EH into existing IPv6 packets to avoid that overhead. > Bandwidth is always getting cheaper. >=20 > I think the value in using IPv6 as the transport for SR is that IPv6 > is becoming and will be the future the commodity layer 3 protocol. > MPLS may be fairly commodity, however IPv6 will be more so, and I > think the reason is that it is an end-to-end protocol that hosts use > (I think this is also why Ethernet has become the dominant link-layer > protocol, even for WAN links). >=20 > So if SR wants to benefit from and leverage IPv6's commodification, > then it needs to be limited to commodity IPv6 operations. If it > deviates, then it isn't commodity IPv6 any more. >=20 > So my motivation for suggesting 32 bit SIDs in IPv6, and I'm guessing > Ron's too for his smaller variable SIDs proposal including 32 bits, is > to try to reduce the overhead of SR over IPv6, while also retaining > commodity IPv6 operation. >=20 > Regards, > Mark. From bocon@opennetworking.org Fri Apr 12 03:27:38 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 005F512028E for ; Fri, 12 Apr 2019 03:27:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=opennetworking.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UXMlUaGPw_6s for ; Fri, 12 Apr 2019 03:27:35 -0700 (PDT) Received: from mail-it1-x12d.google.com (mail-it1-x12d.google.com [IPv6:2607:f8b0:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8F81212019E for ; Fri, 12 Apr 2019 03:27:35 -0700 (PDT) Received: by mail-it1-x12d.google.com with SMTP id v8so134420itf.0 for ; Fri, 12 Apr 2019 03:27:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=opennetworking.org; s=google; h=mime-version:from:date:message-id:subject:to:cc; bh=FfqOzyYqGjuOB0B5oH2Sf6GEAhSmBHKFWJ+arU5qYUU=; b=c/iqgOpSwQn7HS+//d8zCie62I9zVARR68Kp2bS5Klu6Wj5sHZ7b893mtrlGTPaOXP WyJVputhHYySJ8kjvHca+GXkr5sjYVgPDq47qn+34obDdoJmPYaFavg/DHb+QR61J5pZ mfW9aKE1yc8OQy/8WVM0/t2IK83reNyEjhXILIBcwo3yV9WlQW9kQy6qPm83XzGTrt/Y 7dKYpqi1r3zdgdIPHD6jXxgzbQuQ2Ph+YFwR6A8kSKJ7074+NH+awmA0bMAkwiMVsq4Y lH1jB5wXftvrPa9eXTo3fLf3E8cW9Th6C4Vq6nIduOhTVAj10B/z70rbyu9mFFOVb81R JgUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=FfqOzyYqGjuOB0B5oH2Sf6GEAhSmBHKFWJ+arU5qYUU=; b=ZbK1kLMeEhtmv1TWSawMjXXp9/Y0aYo+lfdbCBCMAEwuwt5ziHGEYGU+GcA0copI2J C5go899X+rrym9clcAfITth0BRwzcYIwa5SNhIFohdQs9m91upuuenuz/4JgejSWMqKI FVDDFIB3int/08qsbQb+YoNhXBQeJ4lf8ouYf3wJB+wpoSGeM2HDImSeJGCsN2zDi6TC ViU27WjIPU4xDRIkKZ8HMfUHmYu4yuFnWogmPqUWWhZRgsytxmMIV/A/MZUo4lf01SWK 51yE8E/KGY7WTDODIAh4DijQDuzxSbE7KIa02vvdr0rg+RhBK7ekR/lfOR+n26j5CCmt dtKQ== X-Gm-Message-State: APjAAAWEw7hCTPXb9PghUCuQcRMiN8CNQAIi4jd03RKVtj6IMy22waNv HgL8NuuTZAGVzo055mTkCpJZ/Wd4tEdrIhfgYe9gHA== X-Google-Smtp-Source: APXvYqzmXkiAkGhN+I5sGMSnxyzlERSI5xSyZ6bA8/SlMMo3l8dPASLd/r6Te/yV3UHEPr8eP0ih2FieC7rONh7DNi0= X-Received: by 2002:a05:660c:95:: with SMTP id t21mr12723259itj.6.1555064854605; Fri, 12 Apr 2019 03:27:34 -0700 (PDT) MIME-Version: 1.0 From: "Brian O'Connor" Date: Fri, 12 Apr 2019 03:27:21 -0700 Message-ID: To: draft-filsfils-spring-srv6-network-programming@ietf.org Cc: spring@ietf.org Content-Type: multipart/alternative; boundary="000000000000430ae1058652c014" Archived-At: X-Mailman-Approved-At: Fri, 12 Apr 2019 05:13:32 -0700 Subject: [spring] Mail regarding draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 10:38:49 -0000 --000000000000430ae1058652c014 Content-Type: text/plain; charset="UTF-8" 5.1. T: Transit behavior As per [RFC8200], if a node N receives a packet (A, S2)(S3, S2, S1; *SL=2*) and S2 is neither a local address nor a local SID of N then N forwards the packet without inspecting the SRH. This means that N treats the following two packets with the same performance: - (A, S2) - (A, S2)(S3, S2, S1; *SL=2*) A transit node does not need to count by default the amount of transit traffic with an SRH extension header. This accounting might be enabled as an optional behavior. A transit node MUST include the outer flow label in its ECMP load- balancing hash [RFC6437]. Hi authors, In this section (version 7), I believe that the two instances of SL should be 1, not 2. S2 is at index 1 in the segment list. Thanks, Brian --000000000000430ae1058652c014 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 
5.1.  T: Transit behavior

   As per [RFC8200], if a node N receives a packet (A, S2)(S3, S2, S1;
   SL=3D2) and S2 is neither a local address nor a local SID of N th=
en N
   forwards the packet without inspecting the SRH.

   This means that N treats the following two packets with the same
   performance:

   - (A, S2)

   - (A, S2)(S3, S2, S1; SL=3D2)

   A transit node does not need to count by default the amount of
   transit traffic with an SRH extension header.  This accounting might
   be enabled as an optional behavior.

   A transit node MUST include the outer flow label in its ECMP load-
   balancing hash [RFC6437].
Hi authors,

In this section (version 7), I b= elieve that the two instances of SL should be 1, not 2. S2 is at index 1 in= the segment list.

Thanks,
Brian
--000000000000430ae1058652c014-- From nobody Fri Apr 12 07:26:12 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 45EA31203BE for ; Fri, 12 Apr 2019 07:26:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pFz5k6Y7-eLY for ; Fri, 12 Apr 2019 07:26:02 -0700 (PDT) Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6B7FC120751 for ; Fri, 12 Apr 2019 07:26:02 -0700 (PDT) Received: by mail-qt1-x82c.google.com with SMTP id s15so11432638qtn.3 for ; Fri, 12 Apr 2019 07:26:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=MBfSWMwrVEodV4RF7TPkS8BzUOKnYeniZin9hoE0rU8=; b=Wki8kckKxH6sHRDLGiuWLbaIwurhrqKYvCkvJQuGqgMQcoyXwAPBu6REXeMXDG0OyI sGeJqW/fMZ1PSejI5zQ4HFkr0idc24l4z0ZvywiZLBT4CdHj/IA8b+HyPfLHnjthzdYI 8r9PbDp+F9+Fgh5qDvBHgvXrAS3FFogCdoziH7cnYP/CrxygLHD4NzndWhM5mY/cnKH3 /1O4BFrBzJO8hdobLg9lGZfvlVePWMFzAWvVYEcsL8LP2tb9FoZEiYmc+nBkz0wtuSO1 LwJPaVdG9YND1aV8conLkqsWeDxdnP/9GmLCMHIngF+CMzTZrevBdT9vYXUR4xCcZDqL rIGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=MBfSWMwrVEodV4RF7TPkS8BzUOKnYeniZin9hoE0rU8=; b=oME9sXboHUrT11NuAyQebe7qngxY+9y6uFMr7b1TC9VLnqYaUTs51gCa5z3gACO6M7 arbnjE08PgEUAcuWc6faN7s+sGjYPAoQARs9iW+Id13W5XGQdcIZttTzIh3P5nBe9kSd anlJj1OuzRRp+xhhFzURSQ0cL0iClXwkKE+693R8udKMWTyA+YnKxjNf+EYt43nT0BeC 6XnguyD6gwg97edau1b/SrL+L5TnFypDDFsq0JRiGT+XinHiBDF99XbOCvkDNfv+5YmW vVjwexVTZfpjcw1T2ifvnJLO4mDtnhcBrejpytdG+I7MQD7WNcOhsvMkXKhUCOk7MCh4 uKRw== X-Gm-Message-State: APjAAAWDIqP3rqH2c2ZdOAypQJpRUsNvQw2bANnzya6/u0GanUunTFkj Af3aVh5AKsvbesyE8wPdHzdYKXymzOyrd91E7a9GTg== X-Google-Smtp-Source: APXvYqxV6TC30d4p143iSYqogn+xMTxWjoFcN69ynzxQBrGW/QhAkUOlOEiqB1YaLWDjnmgitgW4eGuiVR3MTAfWBkQ= X-Received: by 2002:a0c:963c:: with SMTP id 57mr47185938qvx.166.1555079161263; Fri, 12 Apr 2019 07:26:01 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Tom Herbert Date: Fri, 12 Apr 2019 07:25:50 -0700 Message-ID: To: Robert Raszuk Cc: Mark Smith , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org list" , Dino Farinacci Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 14:26:05 -0000 On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wrote: > > Hi Mark, > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary and = a 32 bit alignment, > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 networ= k. > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may also = create some opportunities to > > leverage IPv4 support in existing protocols to suite carrying and proce= ssing 32 bit SIDs with some, possibly > > slight, modification. For example, perhaps IPv4 Address Family support = in OSPFv3 (RFC 5838) could be > > somehow leveraged to suit SR. > > > Thank you for describing your understanding of fundamentals of SR. > > I think SR while indeed started with the story of "less control plane is = good for you" now clearly has evolved into not only reduction of control pl= ane but what can be even more important to some users ability to request sp= ecific behavior via programmed functions of network elements on a per flow = basis without actually per flow or per path signalling or state. > > Yes for some it may be very useful feature and I am sure some will call i= t overload of data plane or . There is no one size fits all. > > With that let's observe that till today SR did not require any new mappin= g plane to be distributed in control plane and to be inserted into data pla= ne. This is clearly a precedent. > > Furthermore as we see in companion documents all additional network funct= ionality is being taken away from SRH and is being shifted to Destination O= ptions . > > As far as mapping plane I already pointed out in my Vector Routing propos= al that we have one already it is called BGP. One needs to also observe tha= t we as industry worked number of years of protocol suite called LISP allow= ing not only very good mapping plane, but also data plane integration. CC-i= ng lisp authors for their comments. Note also work for integrating SRv6 wit= h LISP which is already is published. > > Since you correctly observed that now SID can be 32 bit and that is simil= ar to the size of IPv4 my fundamental question is why not use something whi= ch already exists instead of defining some sort of new from scratch ? > Robert, I don't see in the SRH draft where 32 bit SIDs are defined. Can you please provide a reference? As for trying to use something that already exists, why does SR used a fixed size format for SIDs instead of a variable length format like that described in RFC6554? Similarly, why does SR define it's own TLV format instead of using Hop-by-Hop and Destination Options defined in RFC8200? Tom > It will be perfectly fine to have full proper SRv6 with SRH and LISP or V= ector Routing as an alternative options. I really do not see a room or need= for yet one more mapping plane. What problem does it solve which would not= be already solved elsewhere ? > > Kind regards, > Robert > > >>> 2) Is there an agreement that solutions which require additional per SR= path state in both control plane and now in data plane are really somethin= g we should be endorsing here ? >> >> >> I think so. >> >> My understanding of what SR is fundamentally about is to reduce control = plane state and processing. The trade-off for reduced control plane state a= nd processing is to instead carry and encode most or all of that informatio= n or its semantics as per-packet overhead. >> >> If the per-packet overhead becomes too large and expensive, then pushing= some of that information and processing back into the control plane should= be ok, as long as there is still a beneficial overall reduction in control= plane state and processing. >> >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary and a= 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform SR in= an IPv6 network. >> >> As 32 bit SIDs are also the same size as IPv4 addresses, that may also c= reate some opportunities to leverage IPv4 support in existing protocols to = suite carrying and processing 32 bit SIDs with some, possibly slight, modif= ication. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 58= 38) could be somehow leveraged to suit SR. >> >> Regards, >> Mark. > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- From nobody Fri Apr 12 07:38:57 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3F9E12030C; Fri, 12 Apr 2019 07:38:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.338 X-Spam-Level: X-Spam-Status: No, score=-1.338 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, KHOP_DYNAMIC=1.363, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, 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L9kZUFSejiynVVAHa1yMLlywAlOy+/Xnm2g2TPJdWFUpzssRcGaQ4ECC7mxJLxvVuOBihBFdeSewF18KhSe3OM7c4yiHGSA2Dlv3wfq3Cb636lbPRtvN8CPgqph3ETvp/rFKKoyZXPVKxk52Dzq7fOheYQuGY5zjjGOiCNuCzmsA2aQCYNxaaAV+ypgHNz+C0pcnVuhzKf6l74USJe+Y+r4Zy8kjsjM6arlPrniNL0ahMkgeY+DuD2N/EXHvSDcr46bDpbI0uHkrlxaXHWMGKU2Aa7eiDopmTlnvyCOVfhJ5Fa2lOknrmLXl2xo3JSGMT1Dm7GZymYEhG1tF8ezf2gI1GWCew2k6kup5YPJtPVRCtwgrEGLh7fF9n/21ywKTudxBsv5/8m6ZUW5x4OnZGQb+kGzfeAdEy5R3PQg/eB4= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: 1eccd3cf-1a99-4a57-7aa1-08d6bf548a15 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Apr 2019 14:38:33.2964 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB5079 X-Proofpoint-Virus-Version: vendor=fsecure 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ietfa.amsl.com (Postfix) with ESMTP id A080212021F; Fri, 12 Apr 2019 08:30:00 -0700 (PDT) X-Quarantine-ID: X-Virus-Scanned: amavisd-new at amsl.com X-Amavis-Alert: BAD HEADER SECTION, Improper folded header field made up entirely of whitespace (char 20 hex): References: ...@OPEXCAUBM43.corporate.adroot.infra.ftgroup>\n X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Un_hnrC3zjMH; Fri, 12 Apr 2019 08:29:58 -0700 (PDT) Received: from orange.com (mta241.mail.business.static.orange.com [80.12.66.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C33A12080B; Fri, 12 Apr 2019 08:29:58 -0700 (PDT) Received: from opfedar07.francetelecom.fr (unknown [xx.xx.xx.9]) by opfedar22.francetelecom.fr (ESMTP service) with ESMTP id 44ghfD61p9z2xW5; Fri, 12 Apr 2019 17:29:56 +0200 (CEST) Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.42]) by opfedar07.francetelecom.fr (ESMTP service) with ESMTP id 44ghfD59NCz5vMq; Fri, 12 Apr 2019 17:29:56 +0200 (CEST) Received: from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBMA2.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0439.000; Fri, 12 Apr 2019 17:29:56 +0200 From: To: SPRING WG CC: "spring-chairs@ietf.org" Thread-Topic: IETF 104 - SPRING meeting Thread-Index: AdTSqhk24exiZ+23QbuJduuz+vEk/QIqI6PwBXxc2VA= Date: Fri, 12 Apr 2019 15:29:55 +0000 Message-ID: <9953_1555082996_5CB0AEF4_9953_424_1_53C29892C857584299CBF5D05346208A48A7BEAF@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <916_1551718512_5C7D5870_916_83_1_53C29892C857584299CBF5D05346208A489F2C58@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] IETF 104 - SPRING meeting X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 15:30:01 -0000 Hi SPRING WG, The minutes have been uploaded: https://datatracker.ietf.org/meeting/104/ma= terials/minutes-104-spring-00 Please review and send corrections on the list as needed before 2019-05-10= =20 Thank you, --Rob, Bruno -----Original Message----- From: DECRAENE Bruno TGI/OLN=20 Sent: Friday, March 15, 2019 6:16 PM To: SPRING WG Cc: spring-chairs@ietf.org Subject: RE: IETF 104 - SPRING meeting Hi SPRING WG, =20 The agenda for the SPRING working group session at IETF 104 has been upload= ed to=20 https://datatracker.ietf.org/meeting/104/materials/agenda-104-spring-00 We were oversubscribed for this session. Whether your draft made it to the agenda or not, you are invited to introdu= ce your draft/update to the mailing list. Please send your slides to both chairs before Tuesday, March 26, 13:00 loca= l time. Earlier is better. Sending PDF is usually better (than the automati= c conversion). A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik= i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting Thank you, See you in Prague. --Rob, Bruno -----Original Message----- From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Monday, March 4, 2019 5:55 PM To: SPRING WG Cc: spring-chairs@ietf.org Subject: [spring] IETF 104 - SPRING meeting Hi WG, For IETF 104, the SPRING WG is currently scheduled to meet Thursday, March = 28, 13:50-15:50. We have a two hours session. https://datatracker.ietf.org/meeting/104/agenda.html It is time to start building the SPRING WG agenda. Please send to chairs your request for a presentation slot, indicating draf= t name, speaker, and desired duration (covering presentation and discussion= ), before Monday 2019-03-11 COB. Before is better. If it is the first presentation of a non-WG draft, please first introduce y= our draft on the mailing list. Otherwise, please give a reason why it is required to have a new presentati= on slot. A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik= i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting Please send your slides before Tuesday, March 26, 13:00 local time. Earlier= is better. Thank you, --Bruno, Rob ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. 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From nobody Fri Apr 12 09:40:17 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83E871202FC; Fri, 12 Apr 2019 09:40:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KN3wLHOmlj7Q; Fri, 12 Apr 2019 09:40:00 -0700 (PDT) Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 39940120371; Fri, 12 Apr 2019 09:39:57 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id a96so5387026pla.6; Fri, 12 Apr 2019 09:39:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=gp4KxVwJxFgpGp+mQhao7iOpBPKzPbVPUwujZuIKvZI=; b=kedC5BnJYGcI/KaXV4JVfvqf1dC7REE/WQg6ME+dLfG2m66QFCXAg2qrWpQjeauOD0 zlxU/MJMoAb0TabVJ07VsXkAOItXxqnhPJTvH6DzNo230mgLR/LADPbp+kE6JYPCYoiw 7gZYrttmrWntbupzefBpMsqC4rBLI+TLHkJ/i8L/01wAekxzPwLZhEVbvB/LYD2rIVbz 1gG+6PFmeMOIClsXzN/fDBc6MuqTuVk6OZZmSIlHxROGWUsZEHR4E9txv5q2HPUsweOt qNIE7MeEUHbdC4NdUmaaQYCz6J38rvLkJe7c8XUZGN3XO8e1kJv9luItfVdHG1P90BXY IbRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=gp4KxVwJxFgpGp+mQhao7iOpBPKzPbVPUwujZuIKvZI=; b=rwU9Wyd7/q9YN1J0SHckeAi0VAwUyIfNoB5XG8IqqaegCp1QqU3aafbTY8BT3yHOxg b9yiFOuvwJl1wEs5CwLxqldH5NXz2rpyGK2fnhMMU/ESmkZtNkZefT/u9ElS8L/qCuP+ IP+3KlmGKPgsmqZ67EWJNG+Cpeqw3b4ae5EPKQ9QZUQaeqVnhJel1Kpp7uwXIYrzgd91 6XV7ndL7z9kXnmER1o+E+Ah6eyxV5XQZ/oA0WXeqiOGSGFy5imw3WKmtMKbJouZKHz+X eISQ+bMsmoeuG7jMnbJWvQRk0INZuP9z3QpP/bbt4UeIdtGqUN37rxDfRrEnLqgcqPeO Pt9w== X-Gm-Message-State: APjAAAWvUh7X661tJyj9K1kzBVRpNlFeNJNpKYCqZikAWFMv5kbelIU5 LOofdVeqAar3Myv9VfPpK2Y= X-Google-Smtp-Source: APXvYqwhoqT4X8wzdSMIxrUTdsVODBvsbo9tTungI/PAuY8Y/yaZEj/mkc4OFvrKXvzWZfvSmuppTg== X-Received: by 2002:a17:902:585:: with SMTP id f5mr27396243plf.116.1555087196282; Fri, 12 Apr 2019 09:39:56 -0700 (PDT) Received: from [10.97.50.55] ([96.72.181.209]) by smtp.gmail.com with ESMTPSA id 17sm58696167pgz.52.2019.04.12.09.39.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Apr 2019 09:39:55 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Dino Farinacci In-Reply-To: Date: Fri, 12 Apr 2019 09:39:54 -0700 Cc: Mark Smith , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org" , Robert Raszuk Content-Transfer-Encoding: quoted-printable Message-Id: <40F707BF-6BF0-4907-8E27-118CD5FE3005@gmail.com> References: <95D431A8-12BF-4025-9A50-5A5580EAD0F7@gmail.com> To: Ron Bonica X-Mailer: Apple Mail (2.3445.9.1) Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 16:40:03 -0000 Sounds good for a intra-AS solution. Dino > On Apr 12, 2019, at 7:38 AM, Ron Bonica wrote: >=20 > Dino, >=20 > Please stand by for ISIS Extensions To Support the CRH. At the moment, = it is ten pages long, including two pages of boilerplate and two pages = of references. >=20 > = Ron >=20 >=20 >=20 > Juniper Internal >=20 >> -----Original Message----- >> From: ipv6 On Behalf Of Dino Farinacci >> Sent: Thursday, April 11, 2019 11:21 PM >> To: Mark Smith >> Cc: ipv6@ietf.org; SPRING WG ; lisp@ietf.org; Robert >> Raszuk >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >>=20 >> So it looks like SR is either turning out to be like LISP or BIER, or = both. So >> where is the unique value? >>=20 >> The next step is you=E2=80=99ll need a control plane (where = discussions have begun) >> where it makes SR even more like LISP and support for multicast = (where >> discussions have begun) where it makes SR even more like BIER. >>=20 >> Dino >>=20 >>> On Apr 11, 2019, at 7:59 PM, Mark Smith >> wrote: >>>=20 >>> Hi Robert, >>>=20 >>> Sorry not to get back to you sooner. >>>=20 >>>> On Mon, 1 Apr 2019 at 01:40, Robert Raszuk = wrote: >>>>=20 >>>> Hi Mark, >>>>=20 >>> >>>>=20 >>>> Since you correctly observed that now SID can be 32 bit and that is = similar >> to the size of IPv4 my fundamental question is why not use something = which >> already exists instead of defining some sort of new from scratch ? >>>>=20 >>>> It will be perfectly fine to have full proper SRv6 with SRH and = LISP or >> Vector Routing as an alternative options. I really do not see a room = or need for >> yet one more mapping plane. What problem does it solve which would = not be >> already solved elsewhere ? >>>>=20 >>>=20 >>> Well, there seems to be or have been concerns about the overhead of >>> using 128 bit SIDs in IPv6. That seemed to be the motivation for EH >>> insertion. >>>=20 >>> I sympathise with the overhead concern, although I'd be quite happy = to >>> put up with the overhead and bandwidth costs of full IPv6-in-IPv6 >>> tunnelling in comparison to non-commodity operations like inserting >>> the SRH EH into existing IPv6 packets to avoid that overhead. >>> Bandwidth is always getting cheaper. >>>=20 >>> I think the value in using IPv6 as the transport for SR is that IPv6 >>> is becoming and will be the future the commodity layer 3 protocol. >>> MPLS may be fairly commodity, however IPv6 will be more so, and I >>> think the reason is that it is an end-to-end protocol that hosts use >>> (I think this is also why Ethernet has become the dominant = link-layer >>> protocol, even for WAN links). >>>=20 >>> So if SR wants to benefit from and leverage IPv6's commodification, >>> then it needs to be limited to commodity IPv6 operations. If it >>> deviates, then it isn't commodity IPv6 any more. >>>=20 >>> So my motivation for suggesting 32 bit SIDs in IPv6, and I'm = guessing >>> Ron's too for his smaller variable SIDs proposal including 32 bits, = is >>> to try to reduce the overhead of SR over IPv6, while also retaining >>> commodity IPv6 operation. >>>=20 >>> Regards, >>> Mark. >>=20 >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: = https://urldefense.proofpoint.com/v2/url?u=3Dhttps- >> 3A__www.ietf.org_mailman_listinfo_ipv6&d=3DDwIGaQ&c=3DHAkYuh63rsuhr6S >> cbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3DFch9FQ82sir-BoLx84hKuKwl- >> AWF2EfpHcAwrDThKP8&m=3DdnxJ4ZzYGvZ8uKFytr8PMMHi5uD35z5ACAx67 >> WEngXc&s=3D83q1T8NObaNS1omQoJRKsQ-b3a-x-_vIbE_LZmviPJ4&e=3D >> -------------------------------------------------------------------- From nobody Fri Apr 12 13:49:14 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E63B120615; 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Fri, 12 Apr 2019 13:48:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=W03jy2TD9zvOCvHF4aS1E01RQNW36Kj59LVnKVj6x8M=; b=m8s8wyq6OiHnb2wSkxy7/30URuC4oyZD31O0VgzHWiNCceFEtCDByjjkISiFdurBHJ mMzNe7tNn5SFy3iXFRMhNQFcsZc5aHfOWx4aGoOxUuk8djeX1wm2SqRh7xRH2GjWNOAE KCfUEclSv7hV2VqDs4bVzr61oVte0Q07caoWci3C4v9eioQ3124SIHjC6vRPAF2lBsPt C3i4olm+D8THseyjBDO4/WK5avYATrTfQT1XVDOq4lH5c8LmgXocu3usUWc8i1lR5aCI 21uI8y67XWtrJaUWVZFNcyNxd/x/n/HRy0mdO5/buOzpQWyUSqFTb10ZZZrddsgKlxR0 kQmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=W03jy2TD9zvOCvHF4aS1E01RQNW36Kj59LVnKVj6x8M=; b=ohnVR2c8Bu5J8fgxObEnKra0w02i0IkoPYoAM24BPsbOveehHqS8BOkuSFG8Q26du3 FYZO/EXLOV4CUtCKYaduHjpDrOyZgeRObljv+CFnrC/UL0mTa35iAockWiRumA/akQl0 TJz7Vok+rZ4kZJa8WUDX0V4LDfQscf0C5CR9AW1rFhfAKDqDa/WSYKji70HcnIaS6Rn5 M/+9vaF5A15hs3W21EVHHYY7owr0qYuJa5DGb1EazoDKp/ClQU4WxbiWGDLntFzE+aWm lupXXiSifskkxcZtjMjguGvtdOodp89b9G6/IG61DGTn4xaAVvxu6tgYKeF7umV8cA8I PASQ== X-Gm-Message-State: APjAAAVmyM7C5iKIzxYJDYvykddHpWs5dQ7aKDoNn1jJef6A13j1LNo1 Rjcw/K1I60T/gozSq8ZtCrjQ2KJErzKPK4S0Fvs= X-Google-Smtp-Source: APXvYqyQnD3LNbg9t1b/iHYXtf6XXQtXJ05am0BwGjW0m2vq5ngase1Dj5THavUagdmXqvGXICOeSlvQmmwePyZt2TE= X-Received: by 2002:a9d:62c8:: with SMTP id z8mr39239234otk.144.1555102137057; Fri, 12 Apr 2019 13:48:57 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Mark Smith Date: Sat, 13 Apr 2019 06:48:30 +1000 Message-ID: To: Tom Herbert Cc: Robert Raszuk , Mark Smith , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org list" , Dino Farinacci Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 20:49:00 -0000 Hi Tom, On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wrote: > > > > Hi Mark, > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary an= d a 32 bit alignment, > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 netw= ork. > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may als= o create some opportunities to > > > leverage IPv4 support in existing protocols to suite carrying and pro= cessing 32 bit SIDs with some, possibly > > > slight, modification. For example, perhaps IPv4 Address Family suppor= t in OSPFv3 (RFC 5838) could be > > > somehow leveraged to suit SR. > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > I think SR while indeed started with the story of "less control plane i= s good for you" now clearly has evolved into not only reduction of control = plane but what can be even more important to some users ability to request = specific behavior via programmed functions of network elements on a per flo= w basis without actually per flow or per path signalling or state. > > > > Yes for some it may be very useful feature and I am sure some will call= it overload of data plane or . There is no one size fits all. > > > > With that let's observe that till today SR did not require any new mapp= ing plane to be distributed in control plane and to be inserted into data p= lane. This is clearly a precedent. > > > > Furthermore as we see in companion documents all additional network fun= ctionality is being taken away from SRH and is being shifted to Destination= Options . > > > > As far as mapping plane I already pointed out in my Vector Routing prop= osal that we have one already it is called BGP. One needs to also observe t= hat we as industry worked number of years of protocol suite called LISP all= owing not only very good mapping plane, but also data plane integration. CC= -ing lisp authors for their comments. Note also work for integrating SRv6 w= ith LISP which is already is published. > > > > Since you correctly observed that now SID can be 32 bit and that is sim= ilar to the size of IPv4 my fundamental question is why not use something w= hich already exists instead of defining some sort of new from scratch ? > > > Robert, > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > please provide a reference? > To clarify, I've been thinking about the idea of a smaller SID size for IPv6 for a while now (since inserting EHs came up), and thought about what would be a generic single size that might suit SR that wasn't the same size as an IPv6 address. 32 bits seemed suitable to me, although if people wanted bigger, I'd be suggesting 64 bits (not entirely coincidentally the common IID size.) Ron and others have written this draft, which supports SIDS of various sizes - 8, 16 or 32 bits - that triggered this discussion. "The IPv6 Compressed Routing Header (CRH)" https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 Regards, Mark. > As for trying to use something that already exists, why does SR used a > fixed size format for SIDs instead of a variable length format like > that described in RFC6554? Similarly, why does SR define it's own TLV > format instead of using Hop-by-Hop and Destination Options defined in > RFC8200? > > Tom > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP or= Vector Routing as an alternative options. I really do not see a room or ne= ed for yet one more mapping plane. What problem does it solve which would n= ot be already solved elsewhere ? > > > > Kind regards, > > Robert > > > > > >>> 2) Is there an agreement that solutions which require additional per = SR path state in both control plane and now in data plane are really someth= ing we should be endorsing here ? > >> > >> > >> I think so. > >> > >> My understanding of what SR is fundamentally about is to reduce contro= l plane state and processing. The trade-off for reduced control plane state= and processing is to instead carry and encode most or all of that informat= ion or its semantics as per-packet overhead. > >> > >> If the per-packet overhead becomes too large and expensive, then pushi= ng some of that information and processing back into the control plane shou= ld be ok, as long as there is still a beneficial overall reduction in contr= ol plane state and processing. > >> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary and= a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform SR = in an IPv6 network. > >> > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may also= create some opportunities to leverage IPv4 support in existing protocols t= o suite carrying and processing 32 bit SIDs with some, possibly slight, mod= ification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC = 5838) could be somehow leveraged to suit SR. > >> > >> Regards, > >> Mark. > > > > -------------------------------------------------------------------- > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- From nobody Fri Apr 12 15:09:42 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED3CE120153 for ; Fri, 12 Apr 2019 15:09:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id acz6xxKVzg0x for ; Fri, 12 Apr 2019 15:09:32 -0700 (PDT) Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C8AAD1200C1 for ; Fri, 12 Apr 2019 15:09:31 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id s15so13067754qtn.3 for ; Fri, 12 Apr 2019 15:09:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=6VMG5ROx8h3XR0PB0SaEKDaaR9EzFF6kKsLkMqb5EZg=; b=vNdw0q1XATjueoxlN0D3Mg+xvp1xmnX8LNtmKVLJsIaKqt2ahNinNR0NJhypIVLBLz Je3C4vqrRyYwLDDSqaBRqfHPJ53MjcfELrq7JS/v6KJlr7EqP1DTRdHU45c/e5j+ufw0 ffb9oPWz9w96wPNO/94Vv1HqZLcqjAT1S332KdHWLYT3mV/NuJb2dEvFiJo/dBWCmzO0 na0uyMH8tlNOls/XtJGEo/fbjtgLHv5YwxC6g6OI71S5/qvVtq9LWfnmxNuij2OezvXj 13/jH4m9qNYBgqXj9SOeTac9Xc/P1kGNqFKg1HA2Qg992fn7yGuUL24n5leIAQBbgaSM yAnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=6VMG5ROx8h3XR0PB0SaEKDaaR9EzFF6kKsLkMqb5EZg=; b=hccgWK6KVMjrllkFmTc2iIwgN7+7dVkprgNjWdvUIpGD3dG8MepNR+j3yuSkvvke5f mlnR+Lp4x2jB8ipYrncY+mcA/vcsM1eELbtsJvvZ5/4vDiEVBSVZDZxIVBKHs3DP4H14 J59N6ASHUWCUrYzmVbsR1LzN4+27gQZaUigS2zuqeCYLcICvqT/E8iBCfRIGPklBpozB 8nL4skD9w/TFvTG6rzOwjZc2/z0HE7Dnw6emQpDYsByRFNkKSSMI0Q0c2baMDadEqHGX D0kxxvrM86DsF8zC8R15F9Qvi2avnfuMK0vRg7M4mpiS0rsSjr045PhG5hacxVD/C7sD 7HxA== X-Gm-Message-State: APjAAAXtTwnOK1JYb1eCuk7PHG6eBUQ6Hu3MuLEmdAl+0j74eSyJpr/n 7uygw0sHYIhg56jfUNHdgUQIxvdCvuPrz+i1QG2yhg== X-Google-Smtp-Source: APXvYqygkqTelTlRQafxcfxO+j+F4vmiId2Q5Nq4FVY/w069HDMDFZDJEJr+YPrWIlLbHtn61B+iQ8GKEgrdAXRV/oQ= X-Received: by 2002:ac8:1833:: with SMTP id q48mr49382100qtj.133.1555106970736; Fri, 12 Apr 2019 15:09:30 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Tom Herbert Date: Fri, 12 Apr 2019 15:09:18 -0700 Message-ID: To: Mark Smith Cc: Robert Raszuk , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org list" , Dino Farinacci Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 22:09:35 -0000 On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wrote= : > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf.org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- From nobody Fri Apr 12 15:13:20 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C2E5F120605 for ; Fri, 12 Apr 2019 15:13:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dHCgS9XRE5Ia for ; Fri, 12 Apr 2019 15:13:15 -0700 (PDT) Received: from mail-qt1-x842.google.com (mail-qt1-x842.google.com [IPv6:2607:f8b0:4864:20::842]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 02296120222 for ; Fri, 12 Apr 2019 15:13:14 -0700 (PDT) Received: by mail-qt1-x842.google.com with SMTP id w5so12995764qtb.11 for ; Fri, 12 Apr 2019 15:13:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2fS0ON8kaiWudWg7vve7pxDdwWA26K2xrSxjKNGWg9w=; b=QABvau4fNK2d0vEqzZ54DL5zz8ryWJ6OORefhk7ernYpBrkuzkjRbUQvubSNZBQ8tx domTomFPCNO1EGnc9BUKYrdCAzRuXye0yj5JneQOaSBbiF8x5MdRmcS2e+Pqu1avkgaK fFU9FvdonlQYFjLJCEhW+4rbW+WcxWgQ32vkUD1mz6rEz2LmjInGq079Y41c5EJde1DO k+SPRGe/zmodVq385rI2rU8qpx4JaoHE0En5+fxRuEYWjj1yD56GkS6PUBnyzu8vQqfl 3iVYVJnzqi7lO/HrusETD14dxCgImfwm9OXqxu0Oy2LajpoOjPscoNDFQqJ7kSuny3Yj 5xdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=2fS0ON8kaiWudWg7vve7pxDdwWA26K2xrSxjKNGWg9w=; b=FPwKAlWebEk9G3ZTu95F0ELWkHt4QVf1TiOZffQlLFvq7Yuaj2sI091mXJg1Yd3xbL 7UbmhU+iBEstz2kCkB+V9J6VL8IhkZcvOXdMuClvfC48XF3Ty1JL9i/enx51gKx/CJT8 LdVaYGvXzHcbQKCSEKNr35FD/pwZ1AR2mM9DK912ptVtnu+1thBfMmfpwyH7/RlFfMH/ 42sB1gm0//4SuD97cVEAC6nVN7SCKcxfpAJT4BxHOpoZRhQE/ybJ3oQr7M9uQI8viJij dv6N47k/stkc8jDfG4SkdCfBXyzEqd6LdbXMXuEd7WVl0zG+fl7FYJM8t+clBnUc4xCw vVkg== X-Gm-Message-State: APjAAAW6jOGlIwnt92WroxqqraiwUoI+HrdMqF4rUKP5WJU4HToVomiv n6qfYRM+NlFu6OgarbQGwqacntnbiivnHC0+149zIA== X-Google-Smtp-Source: APXvYqzq0RMAqky4X0q0VmY+CyT894sOqVBjsEDAEJCtGxQwtKItqhsWYrXwW/FqTP+WUvJucHC+LkCjg1kgdTnCbJ8= X-Received: by 2002:a0c:b095:: with SMTP id o21mr47372292qvc.162.1555107193998; Fri, 12 Apr 2019 15:13:13 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Robert Raszuk Date: Sat, 13 Apr 2019 00:13:03 +0200 Message-ID: To: Tom Herbert Cc: Mark Smith , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org list" , Dino Farinacci Content-Type: multipart/alternative; boundary="000000000000e2e32a05865c9b21" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Apr 2019 22:13:18 -0000 --000000000000e2e32a05865c9b21 Content-Type: text/plain; charset="UTF-8" Hi Tom, I already suggested this on March 30th ... *"PS. But if you choose to go ahead with CRH I would highly advise to make your CRH SID a variable length. "* No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote: > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 > network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and > processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family > support in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control > plane is good for you" now clearly has evolved into not only reduction of > control plane but what can be even more important to some users ability to > request specific behavior via programmed functions of network elements on a > per flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will > call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new > mapping plane to be distributed in control plane and to be inserted into > data plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network > functionality is being taken away from SRH and is being shifted to > Destination Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing > proposal that we have one already it is called BGP. One needs to also > observe that we as industry worked number of years of protocol suite called > LISP allowing not only very good mapping plane, but also data plane > integration. CC-ing lisp authors for their comments. Note also work for > integrating SRv6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is > similar to the size of IPv4 my fundamental question is why not use > something which already exists instead of defining some sort of new from > scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP > or Vector Routing as an alternative options. I really do not see a room or > need for yet one more mapping plane. What problem does it solve which would > not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional > per SR path state in both control plane and now in data plane are really > something we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce > control plane state and processing. The trade-off for reduced control plane > state and processing is to instead carry and encode most or all of that > information or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then > pushing some of that information and processing back into the control plane > should be ok, as long as there is still a beneficial overall reduction in > control plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform > SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to leverage IPv4 support in existing > protocols to suite carrying and processing 32 bit SIDs with some, possibly > slight, modification. For example, perhaps IPv4 Address Family support in > OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------- > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf.org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > -------------------------------------------------------------------- > --000000000000e2e32a05865c9b21 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,

I already suggested this on Mar= ch 30th ...=C2=A0

"PS. But if you choose to go ahead with CRH = I would highly advise to make your CRH SID a variable length. "=

<= /span>
No = feedback/response was received from authors.=C2=A0

Thx,
R.

On= Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:
On Fri, Apr 12, 2019 at 1:48 PM Mark Smith &l= t;markzzzsmith@= gmail.com> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network = elements on a per flow basis without actually per flow or per path signalli= ng or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane inte= gration. CC-ing lisp authors for their comments. Note also work for integra= ting SRv6 with LISP which is already is published.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-= bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support i= n OSPFv3 (RFC 5838) could be somehow leveraged to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= .org
> > > Administrative Requests: https://www.ietf.o= rg/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------
--000000000000e2e32a05865c9b21-- From nobody Fri Apr 12 21:39:18 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6ED7C12012F for ; Fri, 12 Apr 2019 21:39:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Hxz2rd_nB_Xu for ; Fri, 12 Apr 2019 21:39:15 -0700 (PDT) Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C75DA120108 for ; Fri, 12 Apr 2019 21:39:14 -0700 (PDT) Received: by mail-wm1-x332.google.com with SMTP id z6so1795079wmi.0 for ; Fri, 12 Apr 2019 21:39:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:content-transfer-encoding:mime-version:subject:message-id:date :to; bh=fknhQuxobNJBDRw515/Q5sfy0Kv2St4EW1EZ57OxV0k=; b=ogZ5hKtl3q8m7TuzxqDdQQcs7Hzt1Do76S1iVIaIpFNMdP9iRDhBxqJUpRvXEw2+Sz RQr7Nsr5brTDECORcyu53qPBwFH7e4orPRX0FQWknmzyCDEdEfSs1OpzU8TqdQ1re00y UGQ5iWv5ON2dwrZ1vJxxXJWQrfV09QJQSt0dMG/pMe8Vw3JiBY7N1UiLdke1KdLpdETg 8U1AjxkNI50HmRHA3SgB3Uv/HB250dKRq1RysNcn2h4smdtIXELQzwrjdaLnmxDtjRVe GyQbHYTcIEg5bAF7rQXd/0/Yk4zm9ufXX1Tu9Gyk+A+bVioqOZpW4rDSBq76xXhWktje opoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:message-id:date:to; bh=fknhQuxobNJBDRw515/Q5sfy0Kv2St4EW1EZ57OxV0k=; b=E3brUMIBW5CxM6fV/1myMzCNU7r+EsCJL8LtD2AkKOedAyMF+nF6zHewN49LmQF1RU m9X2exjEJALdy874w+2z4MXDHJxo/R21BlN6hESi274Gcso04TbUQX2dm7iIdYGrPFNQ fImsGYiEW1+bcwhORujrCZYFkJT1RiepuEjM9pD8jnyoG4q4oGIhGVG05LNKwrjNXP5y pI+5Y+XOk4LGJlmG6usjdXFtlA1GMXaju2yuM/7ptzYtrDW9quPXFjKAelrZ+XZ+PkYN AiBHyqjrMoOk8UAWtWGXGgvm/oJveTV1kaYsWwh3QIlfBnZacSfq42BCtSK1PjPfVAEm EL3Q== X-Gm-Message-State: APjAAAVMrDng56cmBlRDnddM2fa0r5CKC5pjeSsf3VOEOxidWjtGxejG 0wufB+x8x3KDYj7LlrQ337BUcmG0fIw= X-Google-Smtp-Source: APXvYqw7SCt3VFGambcDBZj94wW0NruBTkIlAOzd9JXhY8ilxQBreUARKCkkhiUDxsrNljhE6CCWyQ== X-Received: by 2002:a1c:1b10:: with SMTP id b16mr14370847wmb.90.1555130352824; Fri, 12 Apr 2019 21:39:12 -0700 (PDT) Received: from [172.18.2.68] ([194.225.148.48]) by smtp.gmail.com with ESMTPSA id y5sm34389284wrw.23.2019.04.12.21.39.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Apr 2019 21:39:12 -0700 (PDT) From: vahid tavajjohi Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Message-Id: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> Date: Sat, 13 Apr 2019 09:09:10 +0430 To: spring@ietf.org X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Apr 2019 04:39:16 -0000 Hi SPRING WG, I have a question about Anycast-SID. 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST NOT = be associated with a prefix that is owned by more than one router within = the same routing domain=E2=80=9D. Also, in section 3.3, it mentioned = that =E2=80=9C An IGP-Anycast segment MUST NOT reference a particular = node=E2=80=9D. 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D= that indicates whether Prefix-SID related to a node or not. My questions are: 1- What happens if I don=E2=80=99t implement these rules in network? 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D = ? Best Regards, Vahid= From nobody Sat Apr 13 16:22:40 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 70780120286; Sat, 13 Apr 2019 16:22:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.499 X-Spam-Level: X-Spam-Status: No, score=-1.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, FROM_LOCAL_NOVOWEL=0.5, HK_RANDOM_ENVFROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9DsbmBajGec6; Sat, 13 Apr 2019 16:22:24 -0700 (PDT) Received: from mail-ot1-x32b.google.com (mail-ot1-x32b.google.com [IPv6:2607:f8b0:4864:20::32b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 474D81203D6; Sat, 13 Apr 2019 16:22:24 -0700 (PDT) Received: by mail-ot1-x32b.google.com with SMTP id u15so11463709otq.10; Sat, 13 Apr 2019 16:22:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=BpliNzDOXEXeGrQIP95L58hfgxkKCr/0TzZOSU+vC4M=; b=WjOXS3CGVr98ukKprhXA37O6/WGw1IW6o0Y5i8SFaeGW56t4FADfrFT2V2tTTg/CrW 4hGJX0jnQqOZR3/pSv9luMhPoH5kxxlKQRN2TdS02+eFX8dQfcjTHjut+D16v34b990X ZSs3hGew9DvIIl5ldznoZ8R2AFJeQzOoX9uJKQRWzGFdTUS81ZMO++dCdxl9iUATPoyC YcUBASHL0xFJHfvSgb+rKMY9rO2uW1qcLx0sf+V+KhoirSrDdxk3tDRrnIXt8/e6BNiH koYjCHG9zHyJSQi1uVA4WbY1QqIAbWhdojLvBgdNY4aab8xUiOkps9hXoB9/dsY/WFIe qUqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=BpliNzDOXEXeGrQIP95L58hfgxkKCr/0TzZOSU+vC4M=; b=n436M5z1MbF+YJFjycpcWjOeTwGZNJJP1J3i5+EelAUTYBBBjtHE0pNDtl2xR1p1GZ zEBJ77hN4xrJRMB8wlHsJIEj5LvCMEIYUzrWUV0UV+5eiD8IFHUOK8kgfd/lSBLXJCkn trLEpu1h33ducj2skSMaF8mbYi4Fv2mNKdxm4asL6FY/EAAnMfAlijO8V3X/RsFUSI1S 5jOZaYtuu2nceUnMLwWoJctdWsAvbrxyHTnn8JWQHjbo48QfuV7CUkrEF6KBuCJzJx5j rFCCnFt9iDoy8iDEUQqo6/2gxuOXBFpu67os2plBcF37UT8EUmN+mMTphWUJXR1Q2HtJ l1qA== X-Gm-Message-State: APjAAAVMUMp1SWHmx9ZtQfLFfSyG7a83r3wCcPZNIf2aBvyDAmpQkYy7 o46kYH0+WMit2uOyqmAKLw1tU1QNXopPxtOVghA= X-Google-Smtp-Source: APXvYqzl6L/9E+5zqe/rw5sE5olIRoWiIibtmQZMdGkGkuaTpAW1wYPq8LWBmEVKDlZh+X4S1VY2zwSS6A2h3hJ/kyg= X-Received: by 2002:a9d:7ad9:: with SMTP id m25mr42761638otn.75.1555197743504; Sat, 13 Apr 2019 16:22:23 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Mark Smith Date: Sun, 14 Apr 2019 09:21:56 +1000 Message-ID: To: Tom Herbert Cc: Robert Raszuk , "ipv6@ietf.org" , SPRING WG , "lisp@ietf.org list" , Dino Farinacci Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Apr 2019 23:22:27 -0000 Hi Tom, On Sat, 13 Apr 2019 at 08:09, Tom Herbert wrote: > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. More generally, I think it is better to have a single size field that is a "one-size-fits-all" for all foreseeable use cases, and some reasonable overhead to try to cater for future unforeseeable use cases. It is simpler in design, implementation and operation. A major operational issue is created if you happen to underestimate the size you need, and have to go through your network increasing it. For a production network, that sort of project is a bit like what replacing an air plane engine would be like while the plane is flying. The simplest and safest way to avoid a future size upgrade is to pick a single size that far exceeds all likely use cases. Apparently that was the practice with CLNS variable length addresses, where people commonly picked 20 octet addresses regardless, with that practice used to then decide against variable length IPv6 addresses. So people preferred and tended to "one-size-fits-all" addressing anyway when they had a variable length addressing choice. It has been common in RFC1918 addressed networks to universally or near universally use /24s for the same reasons. I think RFC6554's complexity is justified because the links it is operating over are very bandwidth and MTU constrained. More general scenarios don't have those sorts of constraints, and constant technology evolution is also constantly reducing or eliminating them. >Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. While not addressing the parts of addresses case, the other choice is to encode semantics in the addresses indicating what they're representing and how they should be processed. We already do that in many cases - unicast address scopes and types (Link-Local scope vs global ULA/GUA), and functions such as 6to4 or discard (i.e. 100::/64), and multicast address scopes and multicast forwarding via replication at network junctions itself. Regards, Mark. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used = a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P or Vector Routing as an alternative options. I really do not see a room o= r need for yet one more mapping plane. What problem does it solve which wou= ld not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional = per SR path state in both control plane and now in data plane are really so= mething we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce co= ntrol plane state and processing. The trade-off for reduced control plane s= tate and processing is to instead carry and encode most or all of that info= rmation or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then p= ushing some of that information and processing back into the control plane = should be ok, as long as there is still a beneficial overall reduction in c= ontrol plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary= and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform= SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may = also create some opportunities to leverage IPv4 support in existing protoco= ls to suite carrying and processing 32 bit SIDs with some, possibly slight,= modification. For example, perhaps IPv4 Address Family support in OSPFv3 (= RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------= - > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf.org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > -------------------------------------------------------------------= - From nobody Sun Apr 14 00:25:41 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9FDA312015F for ; Sun, 14 Apr 2019 00:25:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.69 X-Spam-Level: X-Spam-Status: No, score=-1.69 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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APXvYqwi8Gy4HldrZ/f+9NelIMSj13QOxocvjJFq2UMAqIXCvMfcXojkxZ/rlj1DSZrBmxqEBwXrFA== X-Received: by 2002:adf:fd41:: with SMTP id h1mr39801166wrs.155.1555227892995; Sun, 14 Apr 2019 00:44:52 -0700 (PDT) Received: from [172.18.2.68] ([194.225.148.48]) by smtp.gmail.com with ESMTPSA id x18sm66692520wrw.14.2019.04.14.00.44.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 14 Apr 2019 00:44:51 -0700 (PDT) From: vahid tavajjohi Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_BF3AAE63-7ADD-4F46-9F16-A491F687BA0A" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Date: Sun, 14 Apr 2019 12:14:49 +0430 In-Reply-To: Cc: "spring@ietf.org" To: Alexander Vainshtein References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 07:44:58 -0000 --Apple-Mail=_BF3AAE63-7ADD-4F46-9F16-A491F687BA0A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sasha, It is obvious that it violates rules, my point is what happens in the = network. I can=E2=80=99t find any clue in my LAB environment and any = other documents. I don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in = SRTE. I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I = tried SRTE with explicit-path, it worked correctly. So, my point is = there are no explanation that describes effect of violating rules. Also, definition of Anycast-SID is not clear. For example, is Anycast = for plane separation is different than Anycast for HA(ABR) or not? I hope my explanation is clear. Regards, Vahid > On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein = wrote: >=20 > Vahid, > Section 2.1.1.2 of the IS-IS Extensions for Segment Routing = draft defines N-Flag in the Prefix-SID Sub-TLV as following (the = relevant text is highlighted): > =20 > N-Flag: Node-SID flag. If set, then the Prefix-SID refers to > the router identified by the prefix. Typically, the N-Flag = is > set on Prefix-SIDs attached to a router loopback address. = The > N-Flag is set when the Prefix-SID is a Node-SID as described = in > [RFC8402 ]. > =20 > An RF C 8402 states in Section 3.2: > =20 > An IGP Node-SID MUST NOT be associated with a prefix that is = owned by > more than one router within the same routing domain. > =20 > =20 > Therefore, the answer to your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is simple: = Your implementation violates a mandatory requirement of the Segment = Routing architecture. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > -----Original Message----- > From: spring On Behalf Of vahid tavajjohi > Sent: Saturday, April 13, 2019 7:39 AM > To: spring@ietf.org > Subject: [spring] Anycast-SID > =20 > Hi SPRING WG, > =20 > I have a question about Anycast-SID. > 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST = NOT be associated with a prefix that is owned by more than one router = within the same routing domain=E2=80=9D. Also, in section 3.3, it = mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D. > =20 > 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80= =9D that indicates whether Prefix-SID related to a node or not. > =20 > My questions are: > 1- What happens if I don=E2=80=99t implement these rules in network? > 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? > 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D= ? > =20 > =20 > Best Regards, > Vahid > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring = > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ --Apple-Mail=_BF3AAE63-7ADD-4F46-9F16-A491F687BA0A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Sasha,
It is obvious that it violates rules, = my point is what happens in the network. I can=E2=80=99t find any clue = in my LAB environment and any other documents.
I = don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in SRTE. = I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I tried = SRTE with explicit-path, it worked correctly. So, my point is there are = no explanation that describes effect of violating rules.
Also, definition of Anycast-SID is not clear. For example, is = Anycast for plane separation is different than Anycast for HA(ABR) or = not?

I hope my = explanation is clear.

Regards,
Vahid

On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Vahid,
Section = 2.1.1.2 of the IS-IS Extensions for Segment Routing draft defines N-Flag in the = Prefix-SID Sub-TLV as following (the relevant text is highlighted):
 
         N-Flag: Node-SID = flag.  If set, then the Prefix-SID refers to
         the router = identified by the prefix.  Typically, the N-Flag is
         set on = Prefix-SIDs attached to a router loopback address.  The
         N-Flag is set when the = Prefix-SID is a Node-SID as described in
         [RFC8402].
 
An RF C 8402 states in Section 3.2:
 
         An IGP Node-SID MUST NOT = be associated with a prefix that is owned by
         more than one router = within the same routing domain.
 
 
Therefore, = the answer to your first question =E2=80=9CWhat happens if I don=E2=80=99t implement these rules in = network?=E2=80=9D is simple: Your implementation violates a = mandatory requirement of the Segment Routing architecture.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      = +972-549266302
 
-----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of vahid = tavajjohi
Sent: Saturday, April 13, 2019 7:39 AM
To: spring@ietf.org
Subject: [spring] = Anycast-SID
 
Hi SPRING = WG,
 
I have a = question about Anycast-SID.
1- In RFC 8402 section 3.2, it = mentioned that =E2=80=9CNode-SID MUST NOT be associated with a prefix = that is owned by more than one router within the same routing domain=E2=80= =9D. Also, in section 3.3, it mentioned that =E2=80=9C An IGP-Anycast = segment MUST NOT reference a particular node=E2=80=9D.
 
2- Also, = we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D that = indicates whether Prefix-SID related to a node or not.
 
My = questions are:
1- What happens if I don=E2=80=99t implement these rules in = network?
2- What happens if I set anycast-sid on multiple nodes, but I = don=E2=80=99t set "n-flag clear=E2=80=9D under loopback = configuration?
3- Why "IGP-Anycast segment MUST NOT reference a particular = node=E2=80=9D ?
 
 
Best Regards,
Vahid
_______________________________________________
spring = mailing list
https://www.ietf.org/mailman/listinfo/spring

_______________________________________________________________= ____________

This e-mail = message is intended for the recipient only and contains information = which is 
CONFIDENTIAL and which may be = proprietary to ECI Telecom. If you have received this 
transmission in error, please = inform us by e-mail, phone or fax, and then delete the original 
and all copies = thereof.
_______________________________________________________________= ____________

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Date: Sun, 14 Apr 2019 13:18:37 +0430 In-Reply-To: Cc: "spring@ietf.org" To: Alexander Vainshtein References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 08:48:46 -0000 --Apple-Mail=_DB8D1D3C-A6C6-4DFB-BFE2-FAC2EF0B7E38 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sasha, Ok it is clear. Based on your scenario, If I set Anycast-SID and clear = N-Flag , problem will solve? Regards, Vahid > On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein = wrote: >=20 > Vahid, > This is not about PCE, it is (eventually) about traffic. > May I suggest that you perform the following test: > 1. Define the same IPv4 /32 prefix in two nodes A and B as a = Node-SID. > 2. Set up a BGP/MPLS IP VPN service that is represented in nodes = A and C, but not in Node B and that uses shortest path SR LSPs as = tunnels. Take care of iBGP in A using the IP address in question as the = NH of VPN-IP routes it advertises while not defining BGP in B. > 3. Run test traffic over this service with ingress in C and = (expected) egress in A. > =20 > You will see that, this traffic will pass if Dist (C A) < Dist (C, B), = and will be blackholed if Dist (C, A) > Dist (C, B). And this is all = you need to know. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi =20 > Sent: Sunday, April 14, 2019 10:45 AM > To: Alexander Vainshtein > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > It is obvious that it violates rules, my point is what happens in the = network. I can=E2=80=99t find any clue in my LAB environment and any = other documents. > I don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in = SRTE. I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I = tried SRTE with explicit-path, it worked correctly. So, my point is = there are no explanation that describes effect of violating rules. > Also, definition of Anycast-SID is not clear. For example, is Anycast = for plane separation is different than Anycast for HA(ABR) or not? > =20 > I hope my explanation is clear. > =20 > Regards, > Vahid >=20 >=20 > On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein = > wrote: > =20 > Vahid, > Section 2.1.1.2 of the IS-IS Extensions for Segment Routing = draft defines N-Flag in the Prefix-SID Sub-TLV as following (the = relevant text is highlighted): > =20 > N-Flag: Node-SID flag. If set, then the Prefix-SID refers to > the router identified by the prefix. Typically, the N-Flag = is > set on Prefix-SIDs attached to a router loopback address. = The > N-Flag is set when the Prefix-SID is a Node-SID as described = in > [RFC8402 ]. > =20 > An RF C 8402 states in Section 3.2: > =20 > An IGP Node-SID MUST NOT be associated with a prefix that is = owned by > more than one router within the same routing domain. > =20 > =20 > Therefore, the answer to your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is simple: = Your implementation violates a mandatory requirement of the Segment = Routing architecture. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > -----Original Message----- > From: spring > On Behalf Of vahid tavajjohi > Sent: Saturday, April 13, 2019 7:39 AM > To: spring@ietf.org > Subject: [spring] Anycast-SID > =20 > Hi SPRING WG, > =20 > I have a question about Anycast-SID. > 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST = NOT be associated with a prefix that is owned by more than one router = within the same routing domain=E2=80=9D. Also, in section 3.3, it = mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D. > =20 > 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80= =9D that indicates whether Prefix-SID related to a node or not. > =20 > My questions are: > 1- What happens if I don=E2=80=99t implement these rules in network? > 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? > 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D= ? > =20 > =20 > Best Regards, > Vahid > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring = >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ --Apple-Mail=_DB8D1D3C-A6C6-4DFB-BFE2-FAC2EF0B7E38 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Sasha,
Ok it is clear. Based on your scenario, = If I set Anycast-SID and clear N-Flag , problem will solve?

Regards,
Vahid

On Apr 14, 2019, at 12:25 PM, = Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Vahid,
This is not about PCE, = it is (eventually) about traffic.
May I suggest that you perform the following test:
1.       Define the same IPv4 /32 prefix in two nodes A and B as a = Node-SID.
2.       Set= up a BGP/MPLS IP VPN service that is represented in nodes A and C, but = not in Node B and that uses shortest path SR LSPs as tunnels. Take care = of iBGP in A using the IP address in question as the NH of VPN-IP =  routes it advertises while not defining BGP in B.
3.       Run= test traffic over this service with ingress in C and (expected) egress = in A.
 
You will see that, this = traffic will pass if Dist (C A) < Dist (C, B), and will be blackholed = if Dist (C, A) > Dist (C, B).  And this is all you need to = know.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 10:45 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
It is obvious that it = violates rules, my point is what happens in the network. I can=E2=80=99t = find any clue in my LAB environment and any other documents.
I don=E2=80=99t clear N-FLAG in anycast but PCE uses = Anycast-SID in SRTE. I clear N-FLAG in anycast, PCE does not uses = Anycast-SID but I tried SRTE with explicit-path, it worked correctly. = So, my point is there are no explanation that describes effect of = violating rules.
Also, definition of = Anycast-SID is not clear. For example, is Anycast for plane separation = is different than Anycast for HA(ABR) or not?
 
I hope my = explanation is clear.
 
Regards,
Vahid


On Apr 14, 2019, at 11:55 AM, Alexander = Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Section 2.1.1.2 of the IS-IS = Extensions for Segment Routing draft defines N-Flag in the = Prefix-SID Sub-TLV as following (the relevant text is highlighted):
 
         N-Flag: Node-SID = flag.  If set, then the Prefix-SID refers to
         the router = identified by the prefix.  Typically, the N-Flag is
         set on = Prefix-SIDs attached to a router loopback address.  The
         N-Flag is set when the = Prefix-SID is a Node-SID as described in
         [RFC8402].
 
An RF C 8402 states = in Section 3.2:
 
         An IGP Node-SID MUST NOT = be associated with a prefix that is owned by
   =       more than one router within the same = routing domain.
 
 
Therefore, the answer to = your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is = simple: Your implementation violates a mandatory requirement of the = Segment Routing architecture.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
-----Original = Message-----
From: spring <spring-bounces@ietf.org> = On Behalf Of vahid tavajjohi
Sent: Saturday, April 13, = 2019 7:39 AM
To: spring@ietf.org
Subject: = [spring] Anycast-SID
 
Hi= SPRING WG,
 
I have a question about = Anycast-SID.
1- In RFC 8402 = section 3.2, it mentioned that =E2=80=9CNode-SID MUST NOT be associated = with a prefix that is owned by more than one router within the same = routing domain=E2=80=9D. Also, in section 3.3, it mentioned that =E2=80=9C= An IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D.
 
2- Also, we have N-Flag = =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D that indicates = whether Prefix-SID related to a node or not.
 
My questions are:
1- What happens if I = don=E2=80=99t implement these rules in network?
2- What happens if I set = anycast-sid on multiple nodes, but I don=E2=80=99t set "n-flag clear=E2=80= =9D under loopback configuration?
3- Why "IGP-Anycast = segment MUST NOT reference a particular node=E2=80=9D ?
 
 
Best Regards,
Vahid
_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring

_______________________________________________________________= ____________

This e-mail message is = intended for the recipient only and contains information which is 
CONFIDENTIAL = and which may be proprietary to ECI Telecom. If you have received = this 
transmission in error, please inform us by e-mail, phone or = fax, and then delete the original 
and all = copies thereof.
_______________________________________________________________= ____________
 

_______________________________________________________________= ____________

This e-mail = message is intended for the recipient only and contains information = which is 
CONFIDENTIAL and which may be = proprietary to ECI Telecom. If you have received this 
transmission in error, please = inform us by e-mail, phone or fax, and then delete the original 
and all copies = thereof.
_______________________________________________________________= ____________
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x18sm66937069wrw.14.2019.04.14.03.02.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 14 Apr 2019 03:02:17 -0700 (PDT) From: vahid tavajjohi Message-Id: <234526C2-ADD7-4ED6-9EB6-5FA355112A78@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_0A2DC4B6-EA91-4768-9591-CA814B95D533" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Date: Sun, 14 Apr 2019 14:32:14 +0430 In-Reply-To: Cc: "spring@ietf.org" To: Alexander Vainshtein References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> <446DD476-1F93-493F-9365-67CFCB227809@gmail.com> X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 10:02:24 -0000 --Apple-Mail=_0A2DC4B6-EA91-4768-9591-CA814B95D533 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sasha, RFC 8402 section 3.3.1 illustrated and mentioned that Group A members = are using anycast address 192.0.2.10/32 and the Anycast-SID 100. So, is = N-flag cleared? and how they used /32? Also, =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the N-Flag = on a received Prefix-SID if the prefix has a Prefix length different = than /32 (IPv4) or /128 (IPv6)=E2=80=9D. So, if I use prefix greater = than /32, routers ignores n-flag and there is no need to clear n-flag by = my self. I glad to clarify me for these. > On Apr 14, 2019, at 1:49 PM, Alexander Vainshtein = wrote: >=20 > Vahid, > RFC 8402 states that =E2=80=9CIGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D while the /32 IPv4 address that iBGP advertises = as the NH of VPN-IP routes of course references a particular node, = namely one the has allocated the labels in these routes. > =20 > I.e., if you clear N-Flag, you MUST NOT use the /32 IPv4 address in = the prefix as the BGP NH in any labeled routes advertised by this node. = =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 11:49 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > Ok it is clear. Based on your scenario, If I set Anycast-SID and clear = N-Flag , problem will solve? > =20 > Regards, > Vahid >=20 >=20 > On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > This is not about PCE, it is (eventually) about traffic. > May I suggest that you perform the following test: > 1. Define the same IPv4 /32 prefix in two nodes A and B as a = Node-SID. > 2. Set up a BGP/MPLS IP VPN service that is represented in nodes = A and C, but not in Node B and that uses shortest path SR LSPs as = tunnels. Take care of iBGP in A using the IP address in question as the = NH of VPN-IP routes it advertises while not defining BGP in B. > 3. Run test traffic over this service with ingress in C and = (expected) egress in A. > =20 > You will see that, this traffic will pass if Dist (C A) < Dist (C, B), = and will be blackholed if Dist (C, A) > Dist (C, B). And this is all = you need to know. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 10:45 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > It is obvious that it violates rules, my point is what happens in the = network. I can=E2=80=99t find any clue in my LAB environment and any = other documents. > I don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in = SRTE. I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I = tried SRTE with explicit-path, it worked correctly. So, my point is = there are no explanation that describes effect of violating rules. > Also, definition of Anycast-SID is not clear. For example, is Anycast = for plane separation is different than Anycast for HA(ABR) or not? > =20 > I hope my explanation is clear. > =20 > Regards, > Vahid >=20 >=20 >=20 > On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein = > wrote: > =20 > Vahid, > Section 2.1.1.2 of the IS-IS Extensions for Segment Routing = draft defines N-Flag in the Prefix-SID Sub-TLV as following (the = relevant text is highlighted): > =20 > N-Flag: Node-SID flag. If set, then the Prefix-SID refers to > the router identified by the prefix. Typically, the N-Flag = is > set on Prefix-SIDs attached to a router loopback address. = The > N-Flag is set when the Prefix-SID is a Node-SID as described = in > [RFC8402 ]. > =20 > An RF C 8402 states in Section 3.2: > =20 > An IGP Node-SID MUST NOT be associated with a prefix that is = owned by > more than one router within the same routing domain. > =20 > =20 > Therefore, the answer to your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is simple: = Your implementation violates a mandatory requirement of the Segment = Routing architecture. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > -----Original Message----- > From: spring > On Behalf Of vahid tavajjohi > Sent: Saturday, April 13, 2019 7:39 AM > To: spring@ietf.org > Subject: [spring] Anycast-SID > =20 > Hi SPRING WG, > =20 > I have a question about Anycast-SID. > 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST = NOT be associated with a prefix that is owned by more than one router = within the same routing domain=E2=80=9D. Also, in section 3.3, it = mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D. > =20 > 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80= =9D that indicates whether Prefix-SID related to a node or not. > =20 > My questions are: > 1- What happens if I don=E2=80=99t implement these rules in network? > 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? > 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D= ? > =20 > =20 > Best Regards, > Vahid > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring = >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ --Apple-Mail=_0A2DC4B6-EA91-4768-9591-CA814B95D533 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Sasha,
RFC 8402 section 3.3.1 illustrated and = mentioned that Group A members are using anycast address 192.0.2.10/32 = and the Anycast-SID 100. So, is N-flag cleared? and how they used = /32?
Also, = =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the = N-Flag on a received Prefix-SID if the prefix = has a Prefix length different than /32 (IPv4) or /128 (IPv6)=E2=80=9D. = So, if I use prefix greater than /32, routers ignores n-flag and there = is no need to clear n-flag by my self.

I glad to clarify me for these.


On Apr = 14, 2019, at 1:49 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Vahid,
RFC 8402 states that = =E2=80=9CIGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D = while the /32 IPv4 address that iBGP advertises as the NH of VPN-IP = routes of course references a particular node, namely one the has = allocated the labels in these routes.
 
I.e., if you clear = N-Flag, you MUST NOT use the /32 IPv4 address in the prefix as the BGP = NH in any labeled routes advertised by this node.   
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 11:49 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
Ok it is clear. Based on = your scenario, If I set Anycast-SID and clear N-Flag , problem will = solve?
 
Regards,
Vahid


On Apr 14, 2019, at 12:25 PM, Alexander = Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
This is not about PCE, = it is (eventually) about traffic.
May I suggest that you = perform the following test:
1.       Define the same IPv4 /32 prefix in two = nodes A and B as a Node-SID.
2.       Set up a BGP/MPLS IP VPN service that is = represented in nodes A and C, but not in Node B and that uses shortest = path SR LSPs as tunnels. Take care of iBGP in A using the IP address in = question as the NH of VPN-IP  routes it advertises while not = defining BGP in B.
3.       Run test traffic over this service with = ingress in C and (expected) egress in A.
 
You will see that, this = traffic will pass if Dist (C A) < Dist (C, B), and will be blackholed = if Dist (C, A) > Dist (C, B).  And this is all you need to = know.
 
 
Regards,
Sasha
 
Office: = +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 10:45 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
It is obvious that it violates rules, my point is what = happens in the network. I can=E2=80=99t find any clue in my LAB = environment and any other documents.
I don=E2=80=99t clear = N-FLAG in anycast but PCE uses Anycast-SID in SRTE. I clear N-FLAG in = anycast, PCE does not uses Anycast-SID but I tried SRTE with = explicit-path, it worked correctly. So, my point is there are no = explanation that describes effect of violating rules.
Also, definition of = Anycast-SID is not clear. For example, is Anycast for plane separation = is different than Anycast for HA(ABR) or not?
 
I hope my explanation is = clear.
 
Regards,
Vahid



On Apr 14, 2019, at = 11:55 AM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Section 2.1.1.2 of the IS-IS = Extensions for Segment Routing draft defines N-Flag in the = Prefix-SID Sub-TLV as following (the relevant text is highlighted):
 
         N-Flag: Node-SID = flag.  If set, then the Prefix-SID refers to
         the router = identified by the prefix.  Typically, the N-Flag is
         set on = Prefix-SIDs attached to a router loopback address.  The
         N-Flag is set when the = Prefix-SID is a Node-SID as described in
         [RFC8402].
 
An RF C 8402 states = in Section 3.2:
 
  =        An IGP Node-SID MUST NOT be associated with = a prefix that is owned by
   =       more than one router within the same = routing domain.
 
 
Therefore, the = answer to your first question =E2=80=9CWhat = happens if I don=E2=80=99t implement these rules in network?=E2=80= =9D is simple: Your implementation violates a mandatory requirement of = the Segment Routing architecture.
 
 
Regards,
Sasha
 
Office: = +972-39266302
Cell:      = +972-549266302
 
-----Original = Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of vahid = tavajjohi
Sent: Saturday, April 13, 2019 7:39 AM
To: spring@ietf.org
Subject: [spring] = Anycast-SID
 
Hi SPRING = WG,
 
I have a question about Anycast-SID.
1- In RFC 8402 = section 3.2, it mentioned that =E2=80=9CNode-SID MUST NOT be associated = with a prefix that is owned by more than one router within the same = routing domain=E2=80=9D. Also, in section 3.3, it mentioned that =E2=80=9C= An IGP-Anycast segment MUST NOT reference a particular = node=E2=80=9D.
 
2- Also, we have = N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D that = indicates whether Prefix-SID related to a node or not.
 
My questions = are:
1-= What happens if I don=E2=80=99t implement these rules in = network?
2- What happens if I set anycast-sid on multiple = nodes, but I don=E2=80=99t set "n-flag clear=E2=80=9D under loopback = configuration?
3- Why "IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D ?
 
 
Best = Regards,
Vahid
_______________________________________________
spring mailing = list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring<= o:p class=3D"">

_______________________________________________________________= ____________

This e-mail message is = intended for the recipient only and contains information which is 
CONFIDENTIAL = and which may be proprietary to ECI Telecom. If you have received = this 
transmission in error, please inform us by e-mail, phone or = fax, and then delete the original 
and all = copies thereof.
_______________________________________________________________= ____________
 

_______________________________________________________________= ____________

This e-mail message is = intended for the recipient only and contains information which is 
CONFIDENTIAL = and which may be proprietary to ECI Telecom. If you have received = this 
transmission in error, please inform us by e-mail, phone or = fax, and then delete the original 
and all = copies thereof.
_______________________________________________________________= ____________
 

_______________________________________________________________= ____________

This e-mail = message is intended for the recipient only and contains information = which is 
CONFIDENTIAL and which may be = proprietary to ECI Telecom. If you have received this 
transmission in error, please = inform us by e-mail, phone or fax, and then delete the original 
and all copies = thereof.
_______________________________________________________________= ____________
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APXvYqwScHI1NpdrgVolpUm7UsFgnZ1LyIk0DyBPqrZ10n4ndrEzHPMZ/kF7Kp1+1GcHp/SBt2EQXA== X-Received: by 2002:a1c:f702:: with SMTP id v2mr19391039wmh.0.1555240559293; Sun, 14 Apr 2019 04:15:59 -0700 (PDT) Received: from [172.18.2.68] ([194.225.148.48]) by smtp.gmail.com with ESMTPSA id w11sm133360710wre.15.2019.04.14.04.15.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 14 Apr 2019 04:15:57 -0700 (PDT) From: vahid tavajjohi Message-Id: <408E59E3-EC63-4249-ACE5-B1B208406FFB@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_0A8D98F2-9A02-48E0-8C8B-E36A00853463" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Date: Sun, 14 Apr 2019 15:45:54 +0430 In-Reply-To: Cc: "spring@ietf.org" To: Alexander Vainshtein References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> <446DD476-1F93-493F-9365-67CFCB227809@gmail.com> <234526C2-ADD7-4ED6-9EB6-5FA355112A78@gmail.com> X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 11:16:05 -0000 --Apple-Mail=_0A8D98F2-9A02-48E0-8C8B-E36A00853463 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sasha, Sorry, but I don=E2=80=99t get my answer. Also, in SRTE document on =E2=80=9C = http://www.segment-routing.net/tutorials/2017-03-06-segment-routing-traffi= c-engineering-srte/ = ", you can see that it uses Anycast-SID as first = SID of SID list (Page 48). Also, in Cisco affiliated website: =E2=80=9C = https://xrdocs.io/design/blogs/2018-05-09-metro-design-implementation-guid= e/ = =E2=80=9C you can see that they use Anycast prefix (on two nodes) = with one SID, without clearing N-flag clear. (violating RFC 8402 section = 3.2) And these things confused me for meaning of Anycast-SID and effect of = violating RFC8402 rules in network. I think SPRING WG, should add more and specific explanation for Anycast = models and usages. Regards, Vahid vahid.tavajjohi@gmail.com > On Apr 14, 2019, at 3:22 PM, Alexander Vainshtein = wrote: >=20 > Vahid, > Anycast-SID can be used in the middle of the list of SIDs defining a = SR-TE LSP. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi =20 > Sent: Sunday, April 14, 2019 1:02 PM > To: Alexander Vainshtein > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > RFC 8402 section 3.3.1 illustrated and mentioned that Group A members = are using anycast address 192.0.2.10/32 and the Anycast-SID 100. So, is = N-flag cleared? and how they used /32? > Also, =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the N-Flag = on a received Prefix-SID if the prefix has a Prefix length different = than /32 (IPv4) or /128 (IPv6)=E2=80=9D. So, if I use prefix greater = than /32, routers ignores n-flag and there is no need to clear n-flag by = my self. > =20 > I glad to clarify me for these. > =20 >=20 >=20 > On Apr 14, 2019, at 1:49 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > RFC 8402 states that =E2=80=9CIGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D while the /32 IPv4 address that iBGP advertises = as the NH of VPN-IP routes of course references a particular node, = namely one the has allocated the labels in these routes. > =20 > I.e., if you clear N-Flag, you MUST NOT use the /32 IPv4 address in = the prefix as the BGP NH in any labeled routes advertised by this node. = =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 11:49 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > Ok it is clear. Based on your scenario, If I set Anycast-SID and clear = N-Flag , problem will solve? > =20 > Regards, > Vahid >=20 >=20 >=20 > On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > This is not about PCE, it is (eventually) about traffic. > May I suggest that you perform the following test: > 1. Define the same IPv4 /32 prefix in two nodes A and B as a = Node-SID. > 2. Set up a BGP/MPLS IP VPN service that is represented in nodes = A and C, but not in Node B and that uses shortest path SR LSPs as = tunnels. Take care of iBGP in A using the IP address in question as the = NH of VPN-IP routes it advertises while not defining BGP in B. > 3. Run test traffic over this service with ingress in C and = (expected) egress in A. > =20 > You will see that, this traffic will pass if Dist (C A) < Dist (C, B), = and will be blackholed if Dist (C, A) > Dist (C, B). And this is all = you need to know. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 10:45 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > It is obvious that it violates rules, my point is what happens in the = network. I can=E2=80=99t find any clue in my LAB environment and any = other documents. > I don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in = SRTE. I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I = tried SRTE with explicit-path, it worked correctly. So, my point is = there are no explanation that describes effect of violating rules. > Also, definition of Anycast-SID is not clear. For example, is Anycast = for plane separation is different than Anycast for HA(ABR) or not? > =20 > I hope my explanation is clear. > =20 > Regards, > Vahid >=20 >=20 >=20 >=20 > On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein = > wrote: > =20 > Vahid, > Section 2.1.1.2 of the IS-IS Extensions for Segment Routing = draft defines N-Flag in the Prefix-SID Sub-TLV as following (the = relevant text is highlighted): > =20 > N-Flag: Node-SID flag. If set, then the Prefix-SID refers to > the router identified by the prefix. Typically, the N-Flag = is > set on Prefix-SIDs attached to a router loopback address. = The > N-Flag is set when the Prefix-SID is a Node-SID as described = in > [RFC8402 ]. > =20 > An RF C 8402 states in Section 3.2: > =20 > An IGP Node-SID MUST NOT be associated with a prefix that is = owned by > more than one router within the same routing domain. > =20 > =20 > Therefore, the answer to your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is simple: = Your implementation violates a mandatory requirement of the Segment = Routing architecture. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > -----Original Message----- > From: spring > On Behalf Of vahid tavajjohi > Sent: Saturday, April 13, 2019 7:39 AM > To: spring@ietf.org > Subject: [spring] Anycast-SID > =20 > Hi SPRING WG, > =20 > I have a question about Anycast-SID. > 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST = NOT be associated with a prefix that is owned by more than one router = within the same routing domain=E2=80=9D. Also, in section 3.3, it = mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D. > =20 > 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80= =9D that indicates whether Prefix-SID related to a node or not. > =20 > My questions are: > 1- What happens if I don=E2=80=99t implement these rules in network? > 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? > 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D= ? > =20 > =20 > Best Regards, > Vahid > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring = >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ --Apple-Mail=_0A8D98F2-9A02-48E0-8C8B-E36A00853463 Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_359AC36A-F120-4E3D-BA84-C07B82D8BC93" --Apple-Mail=_359AC36A-F120-4E3D-BA84-C07B82D8BC93 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Sasha,
Sorry, but I don=E2=80=99t get my = answer.
Also, in SRTE document on =E2=80=9C http://www.segment-routing.net/tutorials/2017-03-06-segment-rou= ting-traffic-engineering-srte/ ", you can see that it uses = Anycast-SID as first SID of SID list (Page 48).



Also, in Cisco affiliated website: =E2=80=9C https://xrdocs.io/design/blogs/2018-05-09-metro-design-implemen= tation-guide/ =E2=80=9C you can see that they use Anycast = prefix (on two nodes) with one SID, without clearing N-flag clear. = (violating RFC 8402 section 3.2)



And these things confused me for meaning of Anycast-SID and = effect of violating RFC8402 rules in network.
I = think SPRING WG, should add more and specific explanation for Anycast = models and usages.


On Apr 14, 2019, at 3:22 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Vahid,
Anycast-SID can be used = in the middle of the list of SIDs defining a SR-TE LSP.
  
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 1:02 = PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
RFC 8402 section 3.3.1 = illustrated and mentioned that Group A members are using anycast address = 192.0.2.10/32 and the Anycast-SID 100. So, is N-flag cleared? and how = they used /32?
Also, = =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the N-Flag on a received = Prefix-SID if the prefix has a Prefix length different than /32 = (IPv4) or /128 (IPv6)=E2=80=9D. So, if I use prefix greater than /32, = routers ignores n-flag and there is no need to clear n-flag by my = self.
 
I glad to clarify me for these.
 


On Apr 14, 2019, at 1:49 PM, Alexander = Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
RFC 8402 states that = =E2=80=9CIGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D= while the /32 IPv4 address that iBGP advertises as the NH of VPN-IP = routes of course references a particular node, namely one the has = allocated the labels in these routes.
 
I.e., if you clear = N-Flag, you MUST NOT use the /32 IPv4 address in the prefix as the BGP = NH in any labeled routes advertised by this node. =   
 
Regards,
Sasha
 
Office: = +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 11:49 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
Ok it is clear. Based on your scenario, If I set Anycast-SID = and clear N-Flag , problem will solve?
 
Regards,
Vahid



On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
This is not about PCE, it is (eventually) about = traffic.
May I suggest that you = perform the following test:
1.       Define the same IPv4 /32 prefix in two = nodes A and B as a Node-SID.
2.       Set up a BGP/MPLS IP VPN service that is = represented in nodes A and C, but not in Node B and that uses shortest = path SR LSPs as tunnels. Take care of iBGP in A using the IP address in = question as the NH of VPN-IP  routes it advertises while not = defining BGP in B.
3.       Run test traffic over this service with = ingress in C and (expected) egress in A.
 
You will see that, this = traffic will pass if Dist (C A) < Dist (C, B), and will be blackholed = if Dist (C, A) > Dist (C, B).  And this is all you need to = know.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 10:45 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
It is obvious that it violates rules, my point is = what happens in the network. I can=E2=80=99t find any clue in my LAB = environment and any other documents.
I don=E2=80=99t clear N-FLAG in anycast but PCE uses = Anycast-SID in SRTE. I clear N-FLAG in anycast, PCE does not uses = Anycast-SID but I tried SRTE with explicit-path, it worked correctly. = So, my point is there are no explanation that describes effect of = violating rules.
Also, definition of Anycast-SID is not clear. For = example, is Anycast for plane separation is different than Anycast for = HA(ABR) or not?
 
I hope my explanation is clear.
 
Regards,
Vahid




On Apr 14, = 2019, at 11:55 AM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Section 2.1.1.2 of the IS-IS = Extensions for Segment Routing draft defines N-Flag in the = Prefix-SID Sub-TLV as following (the relevant text is highlighted):
 
         = N-Flag: Node-SID = flag.  If set, then the Prefix-SID refers to
         = the router identified by the prefix.  Typically, the N-Flag = is
         set on = Prefix-SIDs attached to a router loopback address.  The
         N-Flag is set when the = Prefix-SID is a Node-SID as described in
         [RFC8402].
 
An RF C 8402 states in Section 3.2:
 
  =        An IGP Node-SID MUST NOT be associated with = a prefix that is owned by
   =       more than one router within the same = routing domain.
 
 
Therefore, the answer to your first question = =E2=80=9CWhat happens if I don=E2=80=99t = implement these rules in network?=E2=80=9D is simple: Your = implementation violates a mandatory requirement of the Segment Routing = architecture.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      = +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
-----Original Message-----
From: = spring <spring-bounces@ietf.org> On Behalf Of = vahid tavajjohi
Sent: Saturday, April 13, 2019 7:39 AM
To: spring@ietf.org
Subject: [spring] = Anycast-SID
 
Hi SPRING WG,
 
I have a question about Anycast-SID.
1- In RFC 8402 section 3.2, it mentioned that = =E2=80=9CNode-SID MUST NOT be associated with a prefix that is owned by = more than one router within the same routing domain=E2=80=9D. Also, in = section 3.3, it mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT = reference a particular node=E2=80=9D.
 
2- Also, we have N-Flag = =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D that indicates = whether Prefix-SID related to a node or not.
 
My questions are:
1- What happens if I don=E2=80=99t implement = these rules in network?
2- What happens if I set anycast-sid on multiple = nodes, but I don=E2=80=99t set "n-flag clear=E2=80=9D under loopback = configuration?
3- Why "IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D ?
 
 
Best Regards,
Vahid
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bits=128/128); Sun, 14 Apr 2019 08:36:06 -0700 (PDT) From: vahid tavajjohi Message-Id: <1DD0946D-E792-41B7-89B6-66505572794A@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_1132821C-B7DF-45C6-A04D-57F16C0A1A56" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Date: Sun, 14 Apr 2019 20:06:01 +0430 In-Reply-To: Cc: "spring@ietf.org" To: Alexander Vainshtein References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> <446DD476-1F93-493F-9365-67CFCB227809@gmail.com> <234526C2-ADD7-4ED6-9EB6-5FA355112A78@gmail.com> <408E59E3-EC63-4249-ACE5-B1B208406FFB@gmail.com> X-Mailer: Apple Mail (2.3445.104.8) Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 15:36:13 -0000 --Apple-Mail=_1132821C-B7DF-45C6-A04D-57F16C0A1A56 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sasha, Thanks for your time to respond my emails. Regards, Vahid vahid.tavajjohi@gmail.com > On Apr 14, 2019, at 5:19 PM, Alexander Vainshtein = wrote: >=20 > Vahid, > The SPRING WG mailing list is not a proper forum for discussing = proprietary tutorials. > They should rather be discussed with whoever has published them, > =20 > Regarding your reference to Anycast-SID appearing as the first SID in = the list =E2=80=93 well, it is a matter of interpretation. =46rom my POV = all SID lists implicitly begin with some identification of the head-end = node, so what you see as the first SID in the list looks as the 2nd SID = in the implicit list. > =20 > =20 > My 2c, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 2:16 PM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > Sorry, but I don=E2=80=99t get my answer. > Also, in SRTE document on =E2=80=9C = http://www.segment-routing.net/tutorials/2017-03-06-segment-routing-traffi= c-engineering-srte/ = ", you can see that it uses Anycast-SID as first = SID of SID list (Page 48). > =20 > > =20 > =20 > Also, in Cisco affiliated website: =E2=80=9C = https://xrdocs.io/design/blogs/2018-05-09-metro-design-implementation-guid= e/ = =E2=80=9C you can see that they use Anycast prefix (on two nodes) = with one SID, without clearing N-flag clear. (violating RFC 8402 section = 3.2) > =20 > > =20 > =20 > And these things confused me for meaning of Anycast-SID and effect of = violating RFC8402 rules in network. > I think SPRING WG, should add more and specific explanation for = Anycast models and usages. > =20 > =20 > Regards, > Vahid > vahid.tavajjohi@gmail.com >=20 >=20 > On Apr 14, 2019, at 3:22 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > Anycast-SID can be used in the middle of the list of SIDs defining a = SR-TE LSP. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 1:02 PM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > RFC 8402 section 3.3.1 illustrated and mentioned that Group A members = are using anycast address 192.0.2.10/32 and the Anycast-SID 100. So, is = N-flag cleared? and how they used /32? > Also, =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the N-Flag = on a received Prefix-SID if the prefix has a Prefix length different = than /32 (IPv4) or /128 (IPv6)=E2=80=9D. So, if I use prefix greater = than /32, routers ignores n-flag and there is no need to clear n-flag by = my self. > =20 > I glad to clarify me for these. > =20 >=20 >=20 >=20 > On Apr 14, 2019, at 1:49 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > RFC 8402 states that =E2=80=9CIGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D while the /32 IPv4 address that iBGP advertises = as the NH of VPN-IP routes of course references a particular node, = namely one the has allocated the labels in these routes. > =20 > I.e., if you clear N-Flag, you MUST NOT use the /32 IPv4 address in = the prefix as the BGP NH in any labeled routes advertised by this node. = =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 11:49 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > Ok it is clear. Based on your scenario, If I set Anycast-SID and clear = N-Flag , problem will solve? > =20 > Regards, > Vahid >=20 >=20 >=20 >=20 > On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein = > wrote: > =20 > Vahid, > This is not about PCE, it is (eventually) about traffic. > May I suggest that you perform the following test: > 1. Define the same IPv4 /32 prefix in two nodes A and B as a = Node-SID. > 2. Set up a BGP/MPLS IP VPN service that is represented in nodes = A and C, but not in Node B and that uses shortest path SR LSPs as = tunnels. Take care of iBGP in A using the IP address in question as the = NH of VPN-IP routes it advertises while not defining BGP in B. > 3. Run test traffic over this service with ingress in C and = (expected) egress in A. > =20 > You will see that, this traffic will pass if Dist (C A) < Dist (C, B), = and will be blackholed if Dist (C, A) > Dist (C, B). And this is all = you need to know. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > From: vahid tavajjohi >=20 > Sent: Sunday, April 14, 2019 10:45 AM > To: Alexander Vainshtein > > Cc: spring@ietf.org > Subject: Re: [spring] Anycast-SID > =20 > Sasha, > It is obvious that it violates rules, my point is what happens in the = network. I can=E2=80=99t find any clue in my LAB environment and any = other documents. > I don=E2=80=99t clear N-FLAG in anycast but PCE uses Anycast-SID in = SRTE. I clear N-FLAG in anycast, PCE does not uses Anycast-SID but I = tried SRTE with explicit-path, it worked correctly. So, my point is = there are no explanation that describes effect of violating rules. > Also, definition of Anycast-SID is not clear. For example, is Anycast = for plane separation is different than Anycast for HA(ABR) or not? > =20 > I hope my explanation is clear. > =20 > Regards, > Vahid >=20 >=20 >=20 >=20 >=20 > On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein = > wrote: > =20 > Vahid, > Section 2.1.1.2 of the IS-IS Extensions for Segment Routing = draft defines N-Flag in the Prefix-SID Sub-TLV as following (the = relevant text is highlighted): > =20 > N-Flag: Node-SID flag. If set, then the Prefix-SID refers to > the router identified by the prefix. Typically, the N-Flag = is > set on Prefix-SIDs attached to a router loopback address. = The > N-Flag is set when the Prefix-SID is a Node-SID as described = in > [RFC8402 ]. > =20 > An RF C 8402 states in Section 3.2: > =20 > An IGP Node-SID MUST NOT be associated with a prefix that is = owned by > more than one router within the same routing domain. > =20 > =20 > Therefore, the answer to your first question =E2=80=9CWhat happens if = I don=E2=80=99t implement these rules in network?=E2=80=9D is simple: = Your implementation violates a mandatory requirement of the Segment = Routing architecture. > =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com = > =20 > -----Original Message----- > From: spring > On Behalf Of vahid tavajjohi > Sent: Saturday, April 13, 2019 7:39 AM > To: spring@ietf.org > Subject: [spring] Anycast-SID > =20 > Hi SPRING WG, > =20 > I have a question about Anycast-SID. > 1- In RFC 8402 section 3.2, it mentioned that =E2=80=9CNode-SID MUST = NOT be associated with a prefix that is owned by more than one router = within the same routing domain=E2=80=9D. Also, in section 3.3, it = mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D. > =20 > 2- Also, we have N-Flag =E2=80=9Cisis-segment-routing-extensions-23=E2=80= =9D that indicates whether Prefix-SID related to a node or not. > =20 > My questions are: > 1- What happens if I don=E2=80=99t implement these rules in network? > 2- What happens if I set anycast-sid on multiple nodes, but I don=E2=80=99= t set "n-flag clear=E2=80=9D under loopback configuration? > 3- Why "IGP-Anycast segment MUST NOT reference a particular node=E2=80=9D= ? > =20 > =20 > Best Regards, > Vahid > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring = >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ > =20 >=20 > = __________________________________________________________________________= _ >=20 > This e-mail message is intended for the recipient only and contains = information which is=20 > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have = received this=20 > transmission in error, please inform us by e-mail, phone or fax, and = then delete the original=20 > and all copies thereof. > = __________________________________________________________________________= _ --Apple-Mail=_1132821C-B7DF-45C6-A04D-57F16C0A1A56 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Sasha,
Thanks for your time to respond my = emails.


Regards,
Vahid


On Apr 14, 2019, at 5:19 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Vahid,
The SPRING WG mailing = list is not a proper forum for discussing proprietary tutorials.
They should rather be = discussed with whoever has published them,
 
Regarding your = reference to Anycast-SID appearing as the first SID in the list =E2=80=93 = well, it is a matter of interpretation. =46rom my POV all SID lists = implicitly begin with some identification of the head-end node, so what = you see as the first SID in the list looks as the 2nd SID = in the implicit list.
 
 
My 2c,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 2:16 = PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
Sorry, but I don=E2=80=99t= get my answer.
Also, in SRTE document = on =E2=80=9C http://www.segment-routing.net/tutorials/2017-03-06-segment-rou= ting-traffic-engineering-srte/ ", you can see that it uses = Anycast-SID as first SID of SID list (Page 48).
 
<image001.png>
 
 
Also, in Cisco affiliated website: = =E2=80=9C https://xrdocs.io/design/blogs/2018-05-09-metro-design-implemen= tation-guide/ =E2=80=9C you can see that they use Anycast = prefix (on two nodes) with one SID, without clearing N-flag clear. = (violating RFC 8402 section 3.2)
 
<image002.png>
 
 
And these things confused me for meaning = of Anycast-SID and effect of violating RFC8402 rules in network.
I think SPRING WG, should add more and specific = explanation for Anycast models and usages.
 
 
Regards,
Vahid
vahid.tavajjohi@gmail.com


On Apr 14, 2019, at 3:22 PM, Alexander = Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Anycast-SID can be used = in the middle of the list of SIDs defining a SR-TE LSP.
  
 
Regards,
Sasha
 
Office: = +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 1:02 = PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
RFC 8402 section 3.3.1 illustrated and mentioned that Group A = members are using anycast address 192.0.2.10/32 and the Anycast-SID 100. = So, is N-flag cleared? and how they used /32?
Also, = =E2=80=9C draft-ietf-isis-segment-routing-extensions-23=E2=80=9D = section 2.1.1.2 states that =E2=80=9C The router MUST ignore the N-Flag on a received = Prefix-SID if the prefix has a Prefix length different than /32 = (IPv4) or /128 (IPv6)=E2=80=9D. So, if I use prefix greater than /32, = routers ignores n-flag and there is no need to clear n-flag by my = self.
 
I glad to clarify me for these.
 



On Apr 14, 2019, at 1:49 = PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
RFC 8402 states that =E2=80=9CIGP-Anycast segment = MUST NOT reference a particular node=E2=80=9D while the /32 IPv4 address that iBGP = advertises as the NH of VPN-IP routes of course references a particular = node, namely one the has allocated the labels in these = routes.
 
I.e., if you clear N-Flag, you MUST NOT use the /32 IPv4 = address in the prefix as the BGP NH in any labeled routes advertised by = this node.   
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 11:49 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
Ok it is clear. Based on your scenario, If I set = Anycast-SID and clear N-Flag , problem will solve?
 
Regards,
Vahid




On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein = <Alexander.Vainshtein@ecitele.com> = wrote:
 
Vahid,
This is not about PCE, = it is (eventually) about traffic.
May I suggest that you = perform the following test:
1.       Define the same IPv4 /32 prefix in two = nodes A and B as a Node-SID.
2.       Set up a BGP/MPLS IP VPN service that is = represented in nodes A and C, but not in Node B and that uses shortest = path SR LSPs as tunnels. Take care of iBGP in A using the IP address in = question as the NH of VPN-IP  routes it advertises while not = defining BGP in B.
3.       Run test traffic over this service with = ingress in C and (expected) egress in A.
 
You will see that, this = traffic will pass if Dist (C A) < Dist (C, B), and will be blackholed = if Dist (C, A) > Dist (C, B).  And this is all you need to = know.
 
 
Regards,
Sasha
 
Office: = +972-39266302
Cell:      +972-549266302
 
From: vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: Sunday, April 14, 2019 = 10:45 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] = Anycast-SID
 
Sasha,
It is obvious that it violates rules, my point is = what happens in the network. I can=E2=80=99t find any clue in my LAB = environment and any other documents.
I don=E2=80=99t clear N-FLAG in anycast but PCE uses = Anycast-SID in SRTE. I clear N-FLAG in anycast, PCE does not uses = Anycast-SID but I tried SRTE with explicit-path, it worked correctly. = So, my point is there are no explanation that describes effect of = violating rules.
Also, definition of = Anycast-SID is not clear. For example, is Anycast for plane separation = is different than Anycast for HA(ABR) or not?
 
I hope my explanation is clear.
 
Regards,
Vahid





On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Section 2.1.1.2 of the IS-IS = Extensions for Segment Routing draft defines N-Flag in the = Prefix-SID Sub-TLV as following (the relevant text is highlighted):
 
         N-Flag: Node-SID = flag.  If set, then the Prefix-SID refers to
         the router = identified by the prefix.  Typically, the N-Flag is
         set on = Prefix-SIDs attached to a router loopback address.  The
         N-Flag is set when the = Prefix-SID is a Node-SID as described in
         [RFC8402].
 
An RF C 8402 states in Section 3.2:
 
  =        An IGP Node-SID MUST NOT be associated with = a prefix that is owned by
   =       more than one router within the same = routing domain.
 
 
Therefore, the answer to your first question = =E2=80=9CWhat happens if I don=E2=80=99t = implement these rules in network?=E2=80=9D is simple: Your = implementation violates a mandatory requirement of the Segment Routing = architecture.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      = +972-549266302
Email:   Alexander.Vainshtein@ecitele.com
 
-----Original Message-----
From: = spring <spring-bounces@ietf.org> On Behalf Of = vahid tavajjohi
Sent: Saturday, April 13, 2019 7:39 AM
To: spring@ietf.org
Subject: [spring] = Anycast-SID
 
Hi SPRING WG,
 
I have a question about Anycast-SID.
1- In RFC 8402 section 3.2, it mentioned that = =E2=80=9CNode-SID MUST NOT be associated with a prefix that is owned by = more than one router within the same routing domain=E2=80=9D. Also, in = section 3.3, it mentioned that =E2=80=9C An IGP-Anycast segment MUST NOT = reference a particular node=E2=80=9D.
 
2- Also, we have N-Flag = =E2=80=9Cisis-segment-routing-extensions-23=E2=80=9D that indicates = whether Prefix-SID related to a node or not.
 
My questions are:
1- What happens if I don=E2=80=99t implement = these rules in network?
2- What happens if I set anycast-sid on multiple = nodes, but I don=E2=80=99t set "n-flag clear=E2=80=9D under loopback = configuration?
3- Why "IGP-Anycast segment MUST NOT reference a = particular node=E2=80=9D ?
 
 
Best Regards,
Vahid
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spring mailing list
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https://www.ietf.org/mailman/listinfo/spring<= o:p class=3D"">

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CONFIDENTIAL = and which may be proprietary to ECI Telecom. If you have received = this 
transmission in error, please inform us by e-mail, phone or = fax, and then delete the original 
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This e-mail message is = intended for the recipient only and contains information which is 
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Sun, 14 Apr 2019 19:36:13 +0000 From: Alexander Vainshtein To: vahid tavajjohi CC: "spring@ietf.org" Thread-Topic: [spring] Anycast-SID Thread-Index: AQHU8bLhKaGFkvne5U+SnDWsCQlJx6Y7QLZQgAAHxICAAABj0IAAEXCAgAAHopCAAAzvAIAADYnwgAAHDACAABlDcIAAL2qAgABDHVo= Date: Sun, 14 Apr 2019 19:36:13 +0000 Message-ID: References: <85D2130A-DBEE-4E9E-BFF9-26847C7C2E4C@gmail.com> <446DD476-1F93-493F-9365-67CFCB227809@gmail.com> <234526C2-ADD7-4ED6-9EB6-5FA355112A78@gmail.com> <408E59E3-EC63-4249-ACE5-B1B208406FFB@gmail.com> , <1DD0946D-E792-41B7-89B6-66505572794A@gmail.com> In-Reply-To: <1DD0946D-E792-41B7-89B6-66505572794A@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [40.67.250.0] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1e09225c-ceba-490e-7bae-08d6c1107474 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600139)(711020)(4605104)(4618075)(2017052603328)(7193020); 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boundary="_000_AM0PR03MB3828ADC6BE2C4CAE52453BC39D2A0AM0PR03MB3828eurp_" MIME-Version: 1.0 X-OriginatorOrg: ecitele.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1e09225c-ceba-490e-7bae-08d6c1107474 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Apr 2019 19:36:13.5231 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR03MB4769 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] Anycast-SID X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 19:36:28 -0000 --_000_AM0PR03MB3828ADC6BE2C4CAE52453BC39D2A0AM0PR03MB3828eurp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Vahid, You are welcome. Thumb typed by Sasha Vainshtein ________________________________ From: vahid tavajjohi Sent: Sunday, April 14, 2019 6:36:01 PM To: Alexander Vainshtein Cc: spring@ietf.org Subject: Re: [spring] Anycast-SID Sasha, Thanks for your time to respond my emails. Regards, Vahid vahid.tavajjohi@gmail.com On Apr 14, 2019, at 5:19 PM, Alexander Vainshtein > wrote: Vahid, The SPRING WG mailing list is not a proper forum for discussing proprietar= y tutorials. They should rather be discussed with whoever has published them, Regarding your reference to Anycast-SID appearing as the first SID in the = list =96 well, it is a matter of interpretation. From my POV all SID lists= implicitly begin with some identification of the head-end node, so what y= ou see as the first SID in the list looks as the 2nd SID in the implicit l= ist. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: vahid tavajjohi > Sent: Sunday, April 14, 2019 2:16 PM To: Alexander Vainshtein > Cc: spring@ietf.org Subject: Re: [spring] Anycast-SID Sasha, Sorry, but I don=92t get my answer. Also, in SRTE document on =93 http://www.segment-routing.net/tutorials/201= 7-03-06-segment-routing-traffic-engineering-srte/ ", you can see that it u= ses Anycast-SID as first SID of SID list (Page 48). Also, in Cisco affiliated website: =93 https://xrdocs.io/design/blogs/2018= -05-09-metro-design-implementation-guide/ =93 you can see that they use An= ycast prefix (on two nodes) with one SID, without clearing N-flag clear. (= violating RFC 8402 section 3.2) And these things confused me for meaning of Anycast-SID and effect of viol= ating RFC8402 rules in network. I think SPRING WG, should add more and specific explanation for Anycast mo= dels and usages. Regards, Vahid vahid.tavajjohi@gmail.com On Apr 14, 2019, at 3:22 PM, Alexander Vainshtein > wrote: Vahid, Anycast-SID can be used in the middle of the list of SIDs defining a SR-TE= LSP. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: vahid tavajjohi > Sent: Sunday, April 14, 2019 1:02 PM To: Alexander Vainshtein > Cc: spring@ietf.org Subject: Re: [spring] Anycast-SID Sasha, RFC 8402 section 3.3.1 illustrated and mentioned that Group A members are = using anycast address 192.0.2.10/32 and the Anycast-SID 100. So, is N-flag= cleared? and how they used /32? Also, =93 draft-ietf-isis-segment-routing-extensions-23=94 section 2.1.1.2= states that =93 The router MUST ignore the N-Flag on a received Prefix-SI= D if the prefix has a Prefix length different than /32 (IPv4) or /128 (IPv= 6)=94. So, if I use prefix greater than /32, routers ignores n-flag and th= ere is no need to clear n-flag by my self. I glad to clarify me for these. On Apr 14, 2019, at 1:49 PM, Alexander Vainshtein > wrote: Vahid, RFC 8402 states that =93IGP-Anycast segment MUST NOT reference a particula= r node=94 while the /32 IPv4 address that iBGP advertises as the NH of VPN= -IP routes of course references a particular node, namely one the has allo= cated the labels in these routes. I.e., if you clear N-Flag, you MUST NOT use the /32 IPv4 address in the pr= efix as the BGP NH in any labeled routes advertised by this node. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: vahid tavajjohi > Sent: Sunday, April 14, 2019 11:49 AM To: Alexander Vainshtein > Cc: spring@ietf.org Subject: Re: [spring] Anycast-SID Sasha, Ok it is clear. Based on your scenario, If I set Anycast-SID and clear N-F= lag , problem will solve? Regards, Vahid On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein > wrote: Vahid, This is not about PCE, it is (eventually) about traffic. May I suggest that you perform the following test: 1. Define the same IPv4 /32 prefix in two nodes A and B as a Node-SI= D. 2. Set up a BGP/MPLS IP VPN service that is represented in nodes A a= nd C, but not in Node B and that uses shortest path SR LSPs as tunnels. Ta= ke care of iBGP in A using the IP address in question as the NH of=20VPN-I= P routes it advertises while not defining BGP in B. 3. Run test traffic over this service with ingress in C and (expecte= d) egress in A. You will see that, this traffic will pass if Dist (C A) < Dist (C, B), and= will be blackholed if Dist (C, A) > Dist (C, B). And this is all you nee= d to know. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: vahid tavajjohi > Sent: Sunday, April 14, 2019 10:45 AM To: Alexander Vainshtein > Cc: spring@ietf.org Subject: Re: [spring] Anycast-SID Sasha, It is obvious that it violates rules, my point is what happens in the netw= ork. I can=92t find any clue in my LAB environment and any other documents= . I don=92t clear N-FLAG in anycast but PCE uses Anycast-SID in SRTE. I clea= r N-FLAG in anycast, PCE does not uses Anycast-SID but I tried SRTE with e= xplicit-path, it worked correctly. So, my point is there are no explanatio= n that describes effect of violating rules. Also, definition of Anycast-SID is not clear. For example, is Anycast for = plane separation is different than Anycast for HA(ABR) or not? I hope my explanation is clear. Regards, Vahid On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein > wrote: Vahid, Section 2.1.1.2 of the IS-IS Extensions for Segment Routing draft defines= N-Flag in the Prefix-SID Sub-TLV as following (the relevant text is highl= ighted): N-Flag: Node-SID flag. If set, then the Prefix-SID refers to the router identified by the prefix. Typically, the N-Flag is set on Prefix-SIDs attached to a router loopback address. The N-Flag is set when the Prefix-SID is a Node-SID as described in [RFC8402]. An RF C 8402 states in Section 3.2: An IGP Node-SID MUST NOT be associated with a prefix that is owne= d by more than one router within the same routing domain. Therefore, the answer to your first question =93What happens if I don=92t = implement these rules in network?=94 is simple: Your implementation violat= es a mandatory requirement of the Segment Routing architecture. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com -----Original Message----- From: spring > On = Behalf Of vahid tavajjohi Sent: Saturday, April 13, 2019 7:39 AM To: spring@ietf.org Subject: [spring] Anycast-SID Hi SPRING WG, I have a question about Anycast-SID. 1- In RFC 8402 section 3.2, it mentioned that =93Node-SID MUST NOT be asso= ciated with a prefix that is owned by more than one router within the same= routing domain=94. Also, in section 3.3, it mentioned that =93 An IGP-Any= cast segment MUST NOT reference a particular node=94. 2- Also, we have N-Flag =93isis-segment-routing-extensions-23=94 that indi= cates whether Prefix-SID related to a node or not. My questions are: 1- What happens if I don=92t implement these rules in network? 2- What happens if I set anycast-sid on multiple nodes, but I don=92t set = "n-flag clear=94 under loopback configuration? 3- Why "IGP-Anycast segment MUST NOT reference a particular node=94 ? Best Regards, Vahid _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this transmission in error, please inform us by e-mail, phone or fax, and then = delete the original and all copies thereof. __________________________________________________________________________= _ __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this transmission in error, please inform us by e-mail, phone or fax, and then = delete the original and all copies thereof. __________________________________________________________________________= _ __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this transmission in error, please inform us by e-mail, phone or fax, and then = delete the original and all copies thereof. __________________________________________________________________________= _ __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this transmission in error, please inform us by e-mail, phone or fax, and then = delete the original and all copies thereof. __________________________________________________________________________= _ __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this transmission in error, please inform us by e-mail, phone or fax, and then = delete the original and all copies thereof. __________________________________________________________________________= _ __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this=20 transmission in error, please inform us by e-mail, phone or fax, and then = delete the original=20 and all copies thereof. __________________________________________________________________________= _ --_000_AM0PR03MB3828ADC6BE2C4CAE52453BC39D2A0AM0PR03MB3828eurp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Vahid,
You are welcome.

Thumb typed by Sasha Vainshtein

From: vahid tavajjohi <= ;vahid.tavajjohi@gmail.com>
Sent: Sunday, April 14, 2019 6:36:01 PM
To: Alexander Vainshtein
Cc: spring@ietf.org
Subject: Re: [spring] Anycast-SID
 
Sasha,
Thanks for your time to respond my emails.


Regards,
Vahid


On Apr 14, 2019, at 5:19 PM, Alexander Vainshtein <Alexander.Vains= htein@ecitele.com> wrote:

Vahid,
The SPRING WG mailing list is not a proper forum for= discussing proprietary tutorials.
They should rather be discussed with whoever has pub= lished them,
 
Regarding your reference to Anycast-SID appearing as= the first SID in the list =96 well, it is a matter of interpretation. Fro= m my POV all SID lists implicitly begin with some identification of the head-end node, so what you see as the first SI= D in the list looks as the 2nd SID in the implicit list.
 
 
My 2c,
Sasha
 
Office: +972-39266302
Cell:      +972-5492663= 02
Email:   Alexander.Vainshte= in@ecitele.com
 
From: = vahid tavajjohi <vahid.tavajjohi= @gmail.com> 
Sent: = Sunday, April 14, 2019 2:16 PM
To: Al= exander Vainshtein <Alexander.Va= inshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] Anycast-SID
 
Sasha,
Sorry, but I don=92t get my answer.
Also, in SRTE document on =93 http://www.segment-ro= uting.net/tutorials/2017-03-06-segment-routing-traffic-engineering-srte/ ", you can see that it uses Anycast-SID as first SID of SID list (Page 48).<= /div>
 
<image001.png>
 
 
Also, in Cisco affiliated website: =93 https://xrdocs.io/design/blo= gs/2018-05-09-metro-design-implementation-guide/ =93 you can see that they use Anycast prefix (on two nodes) with one SID, wit= hout clearing N-flag clear. (violating RFC 8402 section 3.2)
 
<image002.png>
 
 
And these things confused me for meaning of Anycast-SID and effect of viol= ating RFC8402 rules in network.
I think SPRING WG, should add more and specific explanation for Anycast mo= dels and usages.
 
 
Regards,
Vahid
vahid.tavajjoh= i@gmail.com


On Apr 14, 2019, at 3:22 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:
 
Vahid,
Anycast-SID can be used in the middle of the list of= SIDs defining a SR-TE LSP.
  
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-5492663= 02
Email:   Alexander.Vainshtein@ecitele.com
 
From: = vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: = Sunday, April 14, 2019 1:02 PM
To: Al= exander Vainshtein <Alexander.Va= inshtein@ecitele.com>
Cc: spring@ietf.org
Subject: Re: [spring] Anycast-SID
 
Sasha,
RFC 8402 section 3.3.1 illustrated and mentioned that Group A members are = using anycast address 192.0.2.10/32 and the Anycast-SID 100. So, is N-flag= cleared? and how they used /32?
Also, =93 draft-ietf-isis-segment-routing-extensions-23=94 section 2.= 1.1.2 states that =93 The r= outer MUST ignore the N-Flag on a received Prefix-SID if the prefix h= as a Prefix length different than /32 (IPv4) or /128 (IPv6)=94. So, if I use prefix greater than /32, routers ignores n-flag and there is= no need to clear n-flag by my self.
 
I glad to clarify me for these.<= /span>
 



On Apr 14, 2019, at 1:49 PM, Alexander Vainshtein <Alexander.Vains= htein@ecitele.com> wrote:
 
Vahid,
RFC 8402 states that =93IGP-Anycast segment M= UST NOT reference a particular node=94 while the /32 IPv4 address that iBGP advertises as the NH of VPN-IP route= s of course references a particular node, namely one the has allocated the= labels in these routes.
 
I.e., if you clear N-Flag, you MUST NOT use the /32 = IPv4 address in the prefix as the BGP NH in any labeled routes advertised = by this node.   
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-5492663= 02
Email:   Alexander.Vainshtein@ecitele.com
 
From: = vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: = Sunday, April 14, 2019 11:49 AM
To: Al= exander Vainshtein <Alexander.Vainshtein@ecitele.com><= br class=3D""> Cc: spring@ietf.or= g
Subject: Re: [spring] Anycast-SID
 
Sasha,
Ok it is clear. Based on your scenario, If I set Anycast-SID and clear N-F= lag , problem will solve?
 
Regards,
Vahid




On Apr 14, 2019, at 12:25 PM, Alexander Vainshtein <Alexander.Vain= shtein@ecitele.com> wrote:
 
Vahid,
This is not about PCE, it is (eventually) about traf= fic.
May I suggest that you perform the following test:
1.       Define the same IPv4 /32 prefix in two nodes A and B as a Node-SID.
=
2.       Set up a BGP/MPLS IP VPN service that is represented in nodes A and C, but no= t in Node B and that uses shortest path SR LSPs as tunnels. Take care of i= BGP in A using the IP address in question as the NH of VPN-IP  routes= it advertises while not defining BGP in B.
3.       Run test traffic over this service with ingress in C and (expected) egress in= A.
 
You will see that, this traffic will pass if Dist (C= A) < Dist (C, B), and will be blackholed if Dist (C, A) > Dist (C, = B).  And this is all you need to know.
 
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-5492663= 02
Email:   Alexander.Vainshtein@ecitele.com
 
From: = vahid tavajjohi <vahid.tavajjohi@gmail.com> 
Sent: = Sunday, April 14, 2019 10:45 AM
To: Al= exander Vainshtein <Alexander.Vainshtein@ecitele.com><= br class=3D""> Cc: spring@ietf.or= g
Subject: Re: [spring] Anycast-SID
 
Sasha,
It is obvious that it violates rules, my point is what happens in the netw= ork. I can=92t find any clue in my LAB environment and any other documents= .
I don=92t clear N-FLAG in anycast but PCE uses Anycast-SID in SRTE. I clea= r N-FLAG in anycast, PCE does not uses Anycast-SID but I tried SRTE with e= xplicit-path, it worked correctly. So, my point is there are no explanatio= n that describes effect of violating rules.
Also, definition of Anycast-SID is not clear. For example, is Anycast for = plane separation is different than Anycast for HA(ABR) or not?
 
I hope my explanation is clear.
 
Regards,
Vahid





On Apr 14, 2019, at 11:55 AM, Alexander Vainshtein <Alexander.Vain= shtein@ecitele.com> wrote:
 
= Vahid,
= Section 2.1.1.2 of the <= a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-exte= nsions-23" class=3D"" style=3D"color:purple; text-decoration:underline">IS-IS Extensions for Segment Routing draft defines N-Flag in the Prefix-SID Sub-TLV as follo= wing (the relevant text is highlighted):
=  
         N-Flag: Node-SID flag.  If set, then the Prefix-SID refers to
         the router identifie= d by the prefix.  Typically, the N-Flag is
         set on Prefix-SIDs a= ttached to a router loopback address.  The
         N-Flag is set when the Prefix-SID is a Node-SID as described in
         [RFC8402].
 
= An RF C 8402 states in Section 3.2:
=  
         An IGP Node-SID MUST NOT be associated with a= prefix that is owned by
         more than one router within the same routing<= /span> domain.
=  
=  
= Therefore, the answer to your first question =93What happens if I don=92t implement these rules in network?=94 i= s simple: Your implementation violates a mandatory requirement of the Segment Routing architecture.
=  
=  
= Regards,
= Sasha
=  
= Office: +972-39266302
= Cell:      +972-549266302
= Email:   Alexander.Vainshtein@ecitele.com
=  
= -----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of vahid tav= ajjohi
Sent: Saturday, April 13, 2019 7:39 AM
To: spring@ietf.org
Subject: [spring] Anycast-SID
=  
= Hi SPRING WG,
=  
= I have a question about Anycast-SID.
= 1- In RFC 8402 section 3.2, it mentioned that =93Node-SID MUST NOT be asso= ciated with a prefix that is owned by more than one router within the same= routing domain=94. Also, in section 3.3, it mentioned that =93 An IGP-Anycast segment MUST NOT reference a particular= node=94.
=  
= 2- Also, we have N-Flag =93isis-segment-routing-extensions-23=94 that indi= cates whether Prefix-SID related to a node or not.
=  
= My questions are:
= 1- What happens if I don=92t implement these rules in network?
= 2- What happens if I set anycast-sid on multiple nodes, but I don=92t set = "n-flag clear=94 under loopback configuration?
= 3- Why "IGP-Anycast segment MUST NOT reference a particular node=94 ?=
=  
=  
= Best Regards,
= Vahid
= _______________________________________________
= spring mailing list
= spring@ietf.org
= https://www.ietf.org/mailman/listinfo/sp= ring

__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is 
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this 
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original 
and all copies thereof.
__________________________________________________________________________= _
 

__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is 
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this 
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original 
and all copies thereof.
__________________________________________________________________________= _
 

__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is 
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this 
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original 
and all copies thereof.
__________________________________________________________________________= _
 

__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is 
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this 
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original 
and all copies thereof.
__________________________________________________________________________= _
 

_______________________________________________________________= ____________

This e-mail message is intended for the recipient only and contains informatio= n which is 
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have received this 
transmission in error, please inform us by e-mail, phone or fax, and then delete the o= riginal 
and all copies thereof.
_______________________________________________________________= ____________


__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original
and all copies thereof.
__________________________________________________________________________= _
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boundary="_000_BYAPR05MB4245D2964D8F90A3A76356C0AE2A0BYAPR05MB4245namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: 134a5581-4193-4705-891e-08d6c1349a26 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Apr 2019 23:54:58.6339 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB4182 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-14_08:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904140179 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Apr 2019 23:55:10 -0000 --_000_BYAPR05MB4245D2964D8F90A3A76356C0AE2A0BYAPR05MB4245namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring On Behalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert Cc: SPRING WG ; ipv6@ietf.org; Mark Smith ; Dino Farinacci ; lisp@ietf.org list Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf..org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- --_000_BYAPR05MB4245D2964D8F90A3A76356C0AE2A0BYAPR05MB4245namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Ro= bert,

=  

In or= der to make the CRH ASIC-friendly, we have the following constraints:<= /o:p>

=  

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

=  

Curre= ntly, we support 8, 16 and 32 bytes. Do you see a reason why we should supp= ort a length greater than 32? Is there some length less than 32 that would = be beneficial?

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;  Ron

=  

=  

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> = On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark Smith <= ;markzzzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; li= sp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would hig= hly advise to make your CRH SID a variable length. "

 

No feedback/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:=

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ..org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

--_000_BYAPR05MB4245D2964D8F90A3A76356C0AE2A0BYAPR05MB4245namp_-- From nobody Mon Apr 15 01:10:16 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C4D312009C; Mon, 15 Apr 2019 01:10:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pNjgE5HuO5gq; Mon, 15 Apr 2019 01:10:07 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4EADE12004B; Mon, 15 Apr 2019 01:10:07 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 36D067170A424CB39D1A; Mon, 15 Apr 2019 09:10:05 +0100 (IST) Received: from NKGEML413-HUB.china.huawei.com (10.98.56.74) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 15 Apr 2019 09:09:57 +0100 Received: from NKGEML514-MBX.china.huawei.com ([fe80::40a8:f0d:c0f3:2ca5]) by NKGEML413-HUB.china.huawei.com ([10.98.56.74]) with mapi id 14.03.0415.000; Mon, 15 Apr 2019 16:09:38 +0800 From: Xiejingrong To: IPv6 List , "draft-ietf-6man-segment-routing-header@ietf.org" CC: "'spring@ietf.org'" Thread-Topic: Section 4.3.1.2. Upper-layer Header or No Next Header of Thread-Index: AdTzYeETYBpAzW3wQZaODAV94WIDxA== Date: Mon, 15 Apr 2019 08:09:37 +0000 Message-ID: <16253F7987E4F346823E305D08F9115AAB87D931@nkgeml514-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.217.214] Content-Type: multipart/alternative; boundary="_000_16253F7987E4F346823E305D08F9115AAB87D931nkgeml514mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] Section 4.3.1.2. Upper-layer Header or No Next Header of X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Apr 2019 08:10:09 -0000 --_000_16253F7987E4F346823E305D08F9115AAB87D931nkgeml514mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello authors, Section 4.3.1.2. Upper-layer Header or No Next Header of doesn't include the No Next Header case ? The SRv6-Network-programming relies heavily on the No-next-header in SRv6-L= 2VPN cases. Thanks Jingrong --_000_16253F7987E4F346823E305D08F9115AAB87D931nkgeml514mbxchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello authors,

 

Section 4.3.1.2. Upper-layer He= ader or No Next Header of <draft-ietf-6man-segment-routing-header-18>= doesn’t include the No Next Header case ?

 

The SRv6-Network-programming re= lies heavily on the No-next-header in SRv6-L2VPN cases.

 

Thanks

Jingrong

 

--_000_16253F7987E4F346823E305D08F9115AAB87D931nkgeml514mbxchi_-- From nobody Tue Apr 16 09:01:55 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B92F120B36; Tue, 16 Apr 2019 09:01:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kn2cMIXi7RAm; Tue, 16 Apr 2019 09:01:38 -0700 (PDT) Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C743C1208D2; Tue, 16 Apr 2019 08:13:50 -0700 (PDT) Received: by mail-oi1-x22b.google.com with SMTP id v7so17248687oie.8; Tue, 16 Apr 2019 08:13:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=B1ap7ihvm7ZreJxKdL/3MivvtoAOlSY9xyo5U8+eGRc=; b=WM4i+cqkWrsp9IR/bmbDrC3JHg53a1r0l7YLL2lOMqXfM0Log3Y/hOqWSbzHtmgYnL Bx0cVybKThBx7tW4rvK9VTSdgnAEdjawsiLOQiIbAYEVItCc9nRITSL5K6tgAcsbzSLk faiSS28gYTAR4MNnQP/4zca7w3ZrK53k3f3D6O4lOefxIYeaWHMnSg0bZihDAbX9fOU2 pfafLjPgKGKtx9HzpkMuv/22o9v00BLcsW61MrsBt9K1qr06lRoiwO3QlOfFcQW8Jcyo IV5bZkO9AyN2vuDd7J2rrGu1BmUqInk3dkSSELksKGC5MfAX/4Clou7lvBnNi9gqdnlM ZQFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=B1ap7ihvm7ZreJxKdL/3MivvtoAOlSY9xyo5U8+eGRc=; b=ukasyMtw4vroTud3stpw8nvchRIpJbpDrXNVA06aPakuXwLajRWHApJuOhWJ38tA2W W1hz9+iUcZzhvI8zh5585O45zNkznMGrddXAPL9HQ15j2jsAeGy2+bSmT/N2LIsklEBo x6GY7Gdk+QST/p2K19205nSaujcLreGYo5tTbvFIRPXY7U2xhaKYPC9keD/3r2Lps981 fw3wcqUu5joc7PUN5pwsa1/RrfJvvGf2KL4CEbiZFx9GN2W4gVtFwmzz7tyQ2l/tjeRy ZN9FaEXeOguVF8qrIPRNU5CLs2yeRXWgQFmIaeYYTdK7RkqMwMk4IHx0/yDAWK12jnyo ZSZQ== X-Gm-Message-State: APjAAAXBUA/e8WzCd0ixnQeLl7KtAhF24HulbxImuY6OE2KUQc62plOK ekuQ/YlPmbjZG+rxvZL/8RM= X-Google-Smtp-Source: APXvYqwlZ39c0D0HFgoyLsTzl6sBpv+teFAsM/DZzO1uXoqflj1+btPOAqwi0xaWtfMTdaYkgC5MYg== X-Received: by 2002:aca:4507:: with SMTP id s7mr23190571oia.127.1555427629909; Tue, 16 Apr 2019 08:13:49 -0700 (PDT) Received: from Abbass-MBP.attlocal.net ([2602:306:3005:53e0:44f9:3a4f:c63a:24ca]) by smtp.gmail.com with ESMTPSA id h24sm11854211otr.39.2019.04.16.08.13.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Apr 2019 08:13:49 -0700 (PDT) To: Alvaro Retana , The IESG Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, spring@ietf.org References: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> From: Ahmed Bashandy Message-ID: <9d3d5e00-b5a5-3190-648e-750506f178c4@gmail.com> Date: Tue, 16 Apr 2019 08:13:48 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Apr 2019 16:01:45 -0000 thanks a lot for the comments (very clear and to the point) I am taking a look right now and will start discussion with authors of the IGP drafts. Ahmed On 4/10/19 1:25 PM, Alvaro Retana via Datatracker wrote: > Alvaro Retana has entered the following ballot position for > draft-ietf-spring-segment-routing-mpls-19: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > (1) This first point is a cross-document DISCUSS. In short, the assumptions in > this document about what an MCC is responsible for are not in line with the > corresponding IGP drafts for OSPF [1][2] and IS-IS [3]. This misalignment must > be resolved before any of these documents are published. > > [Note: I'll start a thread with the corresponding WGS, Authors, Shepherds, > Chairs and ADs. Let's please discuss this point there.] > > This document uses the following definition in §2: "We call "MPLS Control Plane > Client (MCC)" any control plane entity installing forwarding entries in the > MPLS data plane. IGPs with SR extensions...are examples of MCCs." > > The focus of the IGP drafts is on the transport of the SR information, and not > on other functions (see below). Which component is responsible for what is the > point that needs clarification -- either in this document, the IGP drafts, or > both. > > These are some specific cases: > > (1.1) §2.4 (Mapping a SID Index to an MPLS label): "The following rules MUST be > applied by the MCC when calculating the MPLS label value corresponding the SID > index value "I"." There's nothing in the IGP extension documents that point at > this set of rules, and only a passing reference in the OSPF documents about > outgoing labels. > > (1.2) §2.5 (Incoming Label Collision) also assumes more functions from an MCC > than what the IGP documents do. For example: "Within an MCC, apply > tie-breaking rules to select one FEC only and assign the label to it." > > (1.3) §2.8 also expects work by the IGPs: "the MCC is responsible for > downloading the correct label value to FIB"...in this case not just calculating > the label, but installing it in the FIB. > > (1.4) §2.10.1: "The method by which the MCC on router "R0" determines that PUSH > or CONTINUE operation must be applied using the SID "Si" is beyond the scope of > this document. An example of a method to determine the SID "Si" for PUSH > operation is the case where IS-IS > [I-D.ietf-isis-segment-routing-extensions]..." Note that the IS-IS draft (or > the OSPF ones, for that matter) don't talk about how to determine the operation > -- if that is out of scope of this document, then where is it specified? > > (1.5) From §2: > > An implementation SHOULD check that an IGP node-SID is not associated > with a prefix that is owned by more than one router within the same > routing domain. If so, it SHOULD NOT use this Node-SID, MAY use > another one if available, and SHOULD log an error. > > rfc8402 reads (§3.2): "An IGP Node-SID MUST NOT be associated with a prefix > that is owned by more than one router within the same routing domain." The > text above is not in line with that (MUST NOT vs SHOULD). Also, how can > "SHOULD check" be Normatively enforced? > > Both sentences above seem to be trying to specify a behavior for the IGPs. > > [1] https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions > [2] > https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions > [3] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions > > (2) §2.5.1: According to §2.5, a "tie-breaking rule MUST be deterministic". > However, the specification of the default rules are not: the first step uses > the administrative distance, but the specification says that "the FEC types are > ordered using the default administrative distance ordering defined by the > implementation"...and later that the "user SHOULD ensure that the same > administrative distance preference is used on all routers". The combination of > different implementations and the lack of an absolute requirement to ensure > consistency can easily be non-deterministic. > > This point is related to the text in §2.6 which talks about how "the ingress > node MUST resolve" collisions the same way. Because of the lack of an absolute > requirement for consistency, this "MUST" doesn't guarantee the same result. > > Also related is this text in §2.5.1: "All routers in a routing domain SHOULD > use the same tie-breaking rules to maximize forwarding consistency." When > would all routers not use the same rules? It seems to me that forwarding > consistency is very important and would want to be maximized all the time. > IOW, why not use MUST? > > I'm making this point a DISCUSS item because it is directly related to the > ability of multiple implementations to interoperate. > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > (1) §2.2: "A global segment MUST be a label, or an index which may be mapped to > an MPLS label within the Segment Routing Global Block (SRGB)..." I don't think > this sentence fragment is clear: the intent is surely to say that the global > segment MUST be mapped within the SRGB (and not that it "MUST be a label"), > right? Suggestion: s/A global segment MUST be a label, or an index which may > be mapped/A global segment is a label, or an index which MUST be mapped > > (2) §2.5: "Suppose an anycast prefix...the advertisement of the prefix-SID by > some, but not all, of advertising nodes SHOULD NOT be treated as a label > collision." I'm not sure how the receiver knows if the SID was advertised "by > some, but not all"...or even if the prefix is being used as anycast. Given the > Normative language, please explain. IOW, please clarify the difference between > a duplicate prefix-SID and an anycast prefix. The use of "SHOULD NOT" above > seems to imply that there are cases when the situation should be treated as a > label collision...what are those cases? > > (3) §2.5: "The remaining FECs with the default algorithm...are installed in the > FIB...without any incoming labels..." What will these entries be used for? > Given that we're talking about an MPLS network, there may be no traffic that > matches the FEC (the traffic should be labeled)...if that is the case, then why > install in the FIB at all? OTOH, if there is a possibility that unlabeled > traffic is received, then this entry (meant for a different purpose) could be > used...also not an ideal situation. > > §2.6 makes the case that in order "to minimize the chance of misforwarding, a > FEC that loses its incoming label...MUST NOT be installed in FIB". This > inconsistency adds strength to my questions above. > > (4) §2.5.1: "if more than one competing FEC remains after step 1, select the > smallest numerical FEC value" What value? Are you referring to the FEC type > (introduced later in this section)? If so, please be explicit and consistent. > > (5) §2.5.2.1: The illustration seems incomplete as the rules in §2.5.2 say that > "the receiving instance MUST compute its local label", but in this case "B > decides not to advertise any index". The second part of the example (in > §2.5.2.2) seems to complete the scenario. It seems confusing to me that the > first part shows an incomplete case...or am I misinterpreting the rules? > > (6) §2.7: "PUSH, NEXT, and CONTINUE...The specifications of these operations > can be found in [RFC8402]. This sub-section specifies how to implement each of > these operations in the MPLS forwarding plane." It seems contradictory that > the specification is in two places... In any case, I think that this section > is unnecessary as it doesn't seem to add anything from what rfc8402 already > explains. > > (7) Nits... > > s/flooding mechanisms of link state IGPs fits/flooding mechanisms of link state > IGPs fit > > s/to have a node segment to reach the node/to have a node segment reach the node > > s/per routing instance, topology, algorithm/per routing instance, topology, or > algorithm > > s/except rule/except the rule > > s/local label serves/a local label serves > > s/subTLVs/sub-TLVs > > s/Remaining FECs/The remaining FECs > > s/installed in FIB/installed in the FIB > > s/lowest value SHOULD be/lowest value SHOULD be: > > s/SR Algorithm,)/SR Algorithm) > > From nobody Wed Apr 17 02:00:32 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 79CD0120146; Wed, 17 Apr 2019 02:00:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at 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Thread-Topic: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) Thread-Index: AQHU9G3Afv7dyO4KgUSO+TmSFqXfM6ZAB+8g Importance: high X-Priority: 1 Date: Wed, 17 Apr 2019 09:00:04 +0000 Message-ID: References: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> <9d3d5e00-b5a5-3190-648e-750506f178c4@gmail.com> In-Reply-To: <9d3d5e00-b5a5-3190-648e-750506f178c4@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.234.241.1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 83ff04da-e78c-46f0-c7c7-08d6c3131578 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(5600140)(711020)(4605104)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020); SRVR:AM0PR03MB5492; x-ms-traffictypediagnostic: AM0PR03MB5492: x-ms-exchange-purlcount: 6 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AD6D612042E; Wed, 17 Apr 2019 09:58:11 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <155552029160.21298.2457423576222635002@ietfa.amsl.com> Date: Wed, 17 Apr 2019 09:58:11 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-mpls-20.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2019 16:58:12 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Segment Routing with MPLS data plane Authors : Ahmed Bashandy Clarence Filsfils Stefano Previdi Bruno Decraene Stephane Litkowski Rob Shakir Filename : draft-ietf-spring-segment-routing-mpls-20.txt Pages : 38 Date : 2019-04-17 Abstract: Segment Routing (SR) leverages the source routing paradigm. A node steers a packet through a controlled set of instructions, called segments, by prepending the packet with an SR header. In the MPLS dataplane, the SR header is instantiated through a label stack. This document specifies the forwarding behavior to allow instantiating SR over the MPLS dataplane. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-20 https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-mpls-20 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-mpls-20 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Apr 17 10:33:27 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD3891200C1; Wed, 17 Apr 2019 10:33:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id emK9ysApLK55; Wed, 17 Apr 2019 10:33:22 -0700 (PDT) Received: from mail-oi1-x232.google.com (mail-oi1-x232.google.com [IPv6:2607:f8b0:4864:20::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 02EF912001B; Wed, 17 Apr 2019 10:33:22 -0700 (PDT) Received: by mail-oi1-x232.google.com with SMTP id a6so20687132oie.5; Wed, 17 Apr 2019 10:33:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=RWN4A2Tqiy+RGLlXLohdhF1zVYW57mumLIEKf4eYLHs=; b=DbGYwsfEW4v5WQHYSS5TXmj3XRtcM3xDV+nSX+fE2VKSIum1lg26LK9bhnKkLzLsIs yaH4s8RwDxKD/MtUu2qGP3wDdWLJ5zmm9wftOTG7bSQIU61gXIWSTynfkY2wLedXnEpf Y21XC8gIZzWM3lNM2spxeDMEKyphQQdxZ3oHjj7EhVh4S9IywhzRDSAFL4zuyAzQOM+k Jcr5JUYv967XTSVA4K6uNYvZgV6j1L5oFRxss4nyP3RYM0V2+PQEKKwirVy4n0adN737 KGuTYFbBrRCgx+h1EecVHHTiqIKeg2ngVi7yKuA6O653l0c+VjAkqtG+nGixLRb5fmD2 875A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=RWN4A2Tqiy+RGLlXLohdhF1zVYW57mumLIEKf4eYLHs=; b=YfO5qpUlCh0ZdKcdbzbJ7a7BInxiOuBKcSsWpXsmqy81/w0uRV//vveicUSYLR0c2Z fCV1yMRTTpr6JRb2sGs5r4aM/n/6BeRvXuaAq26oGF6a6GhkC5sD+A6uJvJDLxpHItaC 2ZaXSFdICrrp87x5XzfHNMlI0/MDZiSHQhxe78tKwR6Q6uN0HXDQ0TSjpiTUujMKGvyl Ja7FXGVfJlVbgec3NWO5XLtlNNuUmMm5s/+kylJsUEvuNegX8eEEyrfTfEveuurgOHmA L7YiGNBJX08O9p6wa4D8iwz0owrfD2sLbIh+ruSGzK1zH0bHco1JrbNwyLZFdgGdbp+K RpnA== X-Gm-Message-State: APjAAAXXdjOXkd/te/eZSuMiH3LjrDVwRwUSeM6pe1HyUNTRv8BHNtIm Z/RxCPw41ckZ5CC+RjxDWkQ= X-Google-Smtp-Source: APXvYqz380Tbzn8jJ6Ut+s3ouGiTUjEhIzcuCMxHJxKx8tXOzgDA91PZe+zC/YdWit5aAh7zB0q1OA== X-Received: by 2002:aca:c351:: with SMTP id t78mr64310oif.32.1555522400928; Wed, 17 Apr 2019 10:33:20 -0700 (PDT) Received: from Abbass-MacBook-Pro.local ([2602:306:3005:53e0:8597:24fb:6768:7826]) by smtp.gmail.com with ESMTPSA id 70sm23463993otd.52.2019.04.17.10.33.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 10:33:20 -0700 (PDT) To: Benjamin Kaduk , The IESG Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, spring@ietf.org References: <155493383368.22657.17493399361449567071.idtracker@ietfa.amsl.com> From: Ahmed Bashandy Message-ID: Date: Wed, 17 Apr 2019 10:33:18 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <155493383368.22657.17493399361449567071.idtracker@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Archived-At: Subject: Re: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2019 17:33:26 -0000 Thanks a lot for the valuable comments I just published version 20 See inline "#Ahmed". I left some of the nits to the editor when the RFC is about to be published thanks Ahmed On 4/10/19 3:03 PM, Benjamin Kaduk via Datatracker wrote: > Benjamin Kaduk has entered the following ballot position for > draft-ietf-spring-segment-routing-mpls-19: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > (pro forma) Six authors is more than five, which per RFC 7322 may require > discussion. > > I have a few questions about whether we need to have more stringent or > more specific requirements listed. > > In Section 2: > > An implementation SHOULD check that an IGP node-SID is not associated > with a prefix that is owned by more than one router within the same > routing domain. If so, it SHOULD NOT use this Node-SID, MAY use > another one if available, and SHOULD log an error. #Ahmed: the paragraph is removed as RFC8402 as Alvaro suggested > > While it's not entirely clear to me that we need to mandate checking > (the "SHOULD check"), I have a hard time understanding why we would > allow a known-bad SID to be used ("SHOULD NOT use this Node-SID"). > Shouldn't that be a "MUST NOT", since using it could break the SR > abstraction? > > In Section 2.5: > > 5. The remaining FECs with the default algorithm (see the > specification of prefix-SID algorithm [RFC8402]) are installed in > the FIB natively, such as pure IP entries in case of Prefix FEC, > without any incoming labels corresponding to their SIDs. The > remaining FECs with a non-zero algorithm are not installed in the > FIB. > > I didn't really find where in RFC 8402 we assigned numerical values to > the prefix-SID algorithms, such that "non-zero algorithm" was > well-defined. Should I be looking somewhere else for this? #Ahmed: I agree. I changed the wording to use "shortest path first" and referred to RFC8402 > > In Section 2.5.1: I left several notes in the COMMENT section, but I > think I can summarize the point to "it seems like we are defining a > mapping from attributes of a given FEC/description to a byte string and > applying an ordering to that byte string. But we don't fully specify > how all the bits are encoded in that byte string, and it looks like we > can end up with byte strings of a different length, so the comparison > rule is not necessarily clear in that case." This seems fairly related > to Alvaro's point (2). > > In Appendix A.1 > > | Local IGP SID allocated dynamically by R2 | > | for its "north" adjacency to R3: 9001 | > | for its "north" adjacency to R3: 9003 | > | for its "south" adjacency to R3: 9002 | > | for its "south" adjacency to R3: 9003 | > > 9003 is duplicated for different adjacencies? Isn't that a strongly > disrecommended scenario? #Ahmed: Corrected (thanks for catching the mistake) > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > It seems that we're introducing something of a new concept in this > document of "routing instance" as something with a numerical identifier. > (That is, this does not appear in RFC 8402 or RFC 3031, in terms of > what references I might expect to be in scope.) Am I just missing some > other reference where this is introduced? If not, maybe it is worth > mentioning in a terminology section. #Ahmed: the numerical values are used for the purpose of illustrating the tie breaking rules. What matters is the ordering of the tie-breaking rules > > [I think some of these section-by-section notes were spotted already; > I didn't get a chance to deduplicate.] > > Section 2 > > In order to have a node segment to reach the node, a network operator > SHOULD configure at least one node segment per routing instance, > topology, algorithm. [...] > > nit: maybe "per tuple of [...]"? > > Section 2.2 > > o The label value MUST be unique within the router on which the MCC > is running. i.e. the label MUST only be used to represent the SID > and MUST NOT be used to represent more than one SID or for any > other forwarding purpose on the router. > > Maybe I'm misreading the intent, but "MUST be unique" seems like it's a > requirement from core MPLS and need not be restated. #Ahmed: This statement emphasizes the need for the tie-breaking rules in Section 2.5 > > Section 2.3 > > The rules > applicable to the SRGB are also applicable to the SRLB, except rule > that says that the SRGB MUST only be used to instantiate global SIDs > into the MPLS forwarding plane. [...] > > nit: "except the rule" #Ahmed: Done > > Section 2.4 > > I'd consider writing the algorithm in real code (python?) rather than > abstract pseudocode. In some cases (though probably not here?) > pseudocode makes it easy to miss edge cases that need to be specified in > order for things to be interoperably implementable. > > Section 2.5 > > MPLS Architecture [RFC3031] defines Forwarding Equivalence Class > (FEC) term as the set of packets with similar and / or identical > characteristics which are forwarded the same way and are bound to the > same MPLS incoming (local) label. In Segment-Routing MPLS, local > label serves as the SID for given FEC. > > nit: there's some missing (in)definite articles here; "The MPLS > Architecture", "the local label", "a given FEC". (And it probably reads > better as "defines the term [FEC]" than putting "term" after the name of > the term. #Ahmed: Fixed > > o (Prefix, Routing Instance, Topology, Algorithm [RFC8402]), where a > topology identifies a set of links with metrics. For the purpose > of incoming label collision resolution, the same Topology > numerical value SHOULD be used on all routers to identify the same > set of links with metrics. [...] > > Is the IGP going to help me satisfy this SHOULD or is it more of a > pie-in-the-sky sort of thing? #Ahmed: Well, it is just like all "SHOULDs" in all RFCs and drafts > > Section 2.5.1 > > This document defines the default tie breaking rules that SHOULD be > implemented. An implementation MAY choose to support different tie- > breaking rules and MAY use one of the these instead of the default > tie-breaking rules. All routers in a routing domain SHOULD use the > same tie-breaking rules to maximize forwarding consistency. > > I didn't think through this hard enough to come up with a specific > scenario that would fail, but it seems like there could be bad failure > modes when forwarding consistency is not maintained. That would perhaps > suggest a "MUST" requirement to use the same rules, and perhaps even > announcement of an identifier for what rules are in use, so that peers > can detect an inconsistency. #Ahmed: As mentioned more clearly in page 9 in the latest version and in previous versions, the objective of the tie-breaking rules is determinism: I.e. if the same set of FECs are mapped to a given label "L1", the a router always maps the same label to the same FEC, irrespective of the order by which these mappings are received. Besides the use of MUST vs SHOULD in this paragraph was extensively discussed over the mailing list and the consensus at that time is to keep it as SHOULD because SR-MPLS is already widely deployed and putting a MUST instead of a SHOULD will not cause anyone to modify the implementation simply because the source of the problem is an operator error in the first place > > The default FEC administrative distance order starting from the > lowest value SHOULD be > > I think it would be nice if we could get this to be an "is" rather than > a "SHOULD be", especially since at present we offer no guidance on > actually constructing the required 8-bit numerical values. #Ahmed: The default tie-breaking rules are SHOULD as mentioned above > > The numerical sort across FECs SHOULD be performed as follows: > > It seems like the first two top-level bullets here are not necessarily > part of the procedure itself, but rather some ancillary information > about how to compute values used as part of the procedure. I don't know > if, editorially speaking, the presentation could be improved by > reframing how these are discussed. > > o All prefixes are represented by (128 + 8) bits. > > . A prefix is encoded in the most significant bits and the > remaining bits are set to zero. > > . The prefix length is encoded before the prefix in a field > of size 8 bits. > > This description seems needlessly confusing. Couldn't we write it as > (8+128) bits, and put the sub-bullet for the prefix length before the > other sub-bullet, so that they appear in the order the bits are encoded? #Ahmed: Changed to (8 + 128) as suggested > > o Encode the remaining set of FECs as follows > > o Prefix, Routing Instance, Topology, Algorithm: (Prefix Length, > Prefix, routing_instance_id, Topology, SR Algorithm,) > > o (next-hop, outgoing interface): (next-hop, > outgoing_interface_id) > > o (number of adjacencies, list of next-hops in ascending > numerical order, list of outgoing interface IDs in ascending > numerical order). This encoding is used to encode a parallel > adjacency [RFC8402] > > o (Endpoint, Color): (Endpoint_address, Color_id) > > o (IP address): This is the encoding for a mirror SID FEC. The IP > address is encoded as described above in this section > > I think this needs to say a little bit more about what is being > presented. The part before the colon is what we're using to label a > category of FECs, and the part after the colon is how it is encoded? > There might be a more formal description language to describe the > encoding rules used, and also the (number of adjacencies, list of > next-hops) bullet point doesn't have a colon. #Ahmed I added "is encoded as" to the 1st, 2nd and 4th bullet to specify what is being encoded > > We also don't specify that big-endian (network byte order) is used. #Ahmed: Remember that the objective is to have deterministic mapping of a label to a certain FEC within the same router. Any CPU on which these rules are executed will have one endianness > > o Select the FEC with the smallest numerical value > > If I understand correctly, we are encoding these FECs to byte strings, > but different types of FEC get encoded as different length byte strings. > How do we then interpret these byte strings as numerical values? #Ahmed: I hope Martin's response is satisfactory > > Section 2.6 > > However to minimize > the chance of misforwarding, a FEC that loses its incoming label to > the tie-breaking rules specified in Section 2.5 MUST NOT be > installed in FIB with an outgoing segment routing label based on the > SID corresponding to the lost incoming label. > > It's not entirely clear to me how actionable this requirement is. > That is, is the entity instaslling the FIB entry always going to know > that the outgoing label was "based on" the incoming (non-)label? #Ahmed: That is an implementation detail. For example, an MCC (e.g. ISIS, OSPF) can have "flags" or "type" attached to the incoming and/or outgoing label(s) downloaded to the "conflict resolution component" to indicate the source of  of the label(s). Again that is an implementation detail and I am sure any average SW engineer can implement other (and possibly better) ideas > > Section 2.7.1 > > Setting TTL and TC improperly can have security considerations. > This document does not discuss those, nor does RFC 8402 (the only > reference listed from this document's security considerations). > > Section 4 > > "OAM" is not listed as "well-known" at > https://www.rfc-editor.org/materials/abbrev.expansion.txt and would > typically qualify for expansion on first usage. > > Section 5 > > [see also comment on Section 2.7.1] > > Should we mention that different routers can get different results from > the tie-breaking rules in case of skew in IGP convergence? #Ahmed: I do not think it is necessary. It is well known that if a IGP convergence is not consistent, then there will be a lot of inconsistent forwarding not only because of different tie-breaking rules > > Appendix A.1 > > The packet arrives at router R2. Because the top label 1008 > corresponds to the IGP SID "8", which is the prefix-SID attached to > the prefix 192.0.2.8/32 owned by the node R8, then the instruction > associated with the SID is "forward the packet using all ECMP/UCMP > interfaces and all ECMP/UCMP next-hop(s) along the shortest/useable > path(s) towards R8". Because R2 is not the penultimate hop, R2 > applies the CONTINUE operation to the packet and sends it to R3 using > one of the two links connected to R3 with top label 1008 as specified > in Section 2.10.1. > > "one of the two links" seems inconsistent with the claimed "using all > ECMP/UCMP interfaces and all ECMP/UCMP next-hop(s)". #Ahmed: not really. A given packet is always sent over only one of the ECMP/UCMP links/next-hops > > Because R3 > is the penultimate hop, we assume that R3 performs penumtimate hop > popping, which corresponds to the NEXT operation, then sends the > packet to R8. [...] > > This chain of causality doesn't follow. We assume that R3 performs PHP > -- the fact that in this flow R3 is the penultimate hope does not factor > into that assumption. #Ahmed: why doesn't it factor into the assumption? We cannot assume that non-penultimate router performs penultimate hop popping. I.e. we can make the assumption of "penultimate-hop popping" ONLY if the router is the "penultimate-hop router". Besides it is an "assumption" because in general a penultimate hop router need not always perform penultimate hop popping. > > Appendix A.2.5 > > Since both FECs are from the same MCC, they have the same default > admin distance. So we compare FEC type code-point. FEC1 has FEC type > code-point=120, while FEC2 has FEC type code-point=130. Therefore, > FEC1 wins. > > nit: It feels a little strange to call these code-points when there's no > registry and they're locally assigned per site policy. > > Appendix A.2.6 > > FEC1 and FEC2 both use dynamic SID assignment. Since both FECs are > from the same MCC, they have the same default admin distance. So we > compare FEC type code-point. Both FECs have FEC type code-point=120. > So we compare address family. Since IPv4 is preferred over IPv6, FEC1 > wins. > > side note: It's a little surprising that "IPv4 is preferred over IPv6" > did not get any objections at IETF LC. (Example 13 has the same > property.) > > From nobody Wed Apr 17 10:44:26 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6273B12004F; Wed, 17 Apr 2019 10:44:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7ONFWGWvo3IP; Wed, 17 Apr 2019 10:44:20 -0700 (PDT) Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8E54912002E; Wed, 17 Apr 2019 10:44:20 -0700 (PDT) Received: by mail-ot1-x333.google.com with SMTP id m10so21487753otp.2; Wed, 17 Apr 2019 10:44:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language; bh=q2qZ6peK31/Mk4w5eggBlSiKDgC/DNS98waF3jyjw7I=; b=Dqm+YZa5sPTNpBYW1atKCyX7fLSYHK0UQCWlu2/LEyiw8dMcKwqIatg57lvF31yx3S RgdW8YEhvdiRVMeghyVXnxy/PhAlR60HF8uwEp2yL4FAZpIWCTT9fm5jupajmPBln0st 2gpeJN7LrIqt1O2Mht32/GJt6ljY0p/7yY6ZFAobuWVYF1uwNkIxNi2DXWDsy2i9UWMA 1kcywqsrzPp259jDT2pviHD7BxzUE2vRGOMZR7npK3VDgksWNMxTXGiuVPw72syRSDvI ZKoOPFhZetls65kcgQQz/K3v3LDtRETqUcMrd8B+CezNkRr7F6h/HMc8o8QqGLs9Ltqz gFFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=q2qZ6peK31/Mk4w5eggBlSiKDgC/DNS98waF3jyjw7I=; b=JYbasFksxnJ8jq2eEvePUUDSpnotBEzR8trI77VWDA4p9W3UBsKraLWAIcOhxrFm/y rmpybpeMDKLoq+Ja2/WAYaLb6NjJBxGFiDtzkCKg+RtpBlRNxiQWKG6iQ8XgDaXW52nA /KTdgKur3yf8tyq3s2wxF6dO4tpJI/S6fOljwlRkGyMNN1hlbas5nOGROvG8s2X7j5xF +P8wvGf2ao9WLgZdFS4uYR5XhCzWQWTd12NSjSc44dAT85tzH8uDddH8e3y0RMnOqWKn DdUQA70TtOmI8cjdhHVCp20krxMpBc0xw7acNFuXD402II09qSPEuqdZNVWDPokBliLR oUKA== X-Gm-Message-State: APjAAAW0ADzJOL13JwtArDcrprjPegdhHPtm4aFn4/vm82PAmd4M9+mB 0inSTsP3y06qMSgGIEG58P4= X-Google-Smtp-Source: APXvYqz3HgaPGQYgJAyXE808dtDGxw38w3l/t2JtDAyROKYw5XTgO5Zwe+/ery60lSWCRScSQYL+Iw== X-Received: by 2002:a9d:1912:: with SMTP id j18mr752184ota.350.1555523058662; Wed, 17 Apr 2019 10:44:18 -0700 (PDT) Received: from Abbass-MacBook-Pro.local ([2602:306:3005:53e0:8597:24fb:6768:7826]) by smtp.gmail.com with ESMTPSA id 189sm22309394oid.35.2019.04.17.10.44.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 10:44:17 -0700 (PDT) To: Alvaro Retana , The IESG Cc: draft-ietf-spring-segment-routing-mpls@ietf.org, Shraddha Hegde , spring-chairs@ietf.org, spring@ietf.org References: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> From: Ahmed Bashandy Message-ID: <2cf19bad-bd19-9efe-bfab-383af21dd0b0@gmail.com> Date: Wed, 17 Apr 2019 10:44:16 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <155492791984.22516.1330631144491086257.idtracker@ietfa.amsl.com> Content-Type: multipart/alternative; boundary="------------B1905D9A1E6DB72FB4E18860" Content-Language: en-US Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2019 17:44:24 -0000 This is a multi-part message in MIME format. --------------B1905D9A1E6DB72FB4E18860 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Thanks a lot for the comments See inline #Ahmed Thanks Ahmed On 4/10/19 1:25 PM, Alvaro Retana via Datatracker wrote: > Alvaro Retana has entered the following ballot position for > draft-ietf-spring-segment-routing-mpls-19: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > (1) This first point is a cross-document DISCUSS. In short, the assumptions in > this document about what an MCC is responsible for are not in line with the > corresponding IGP drafts for OSPF [1][2] and IS-IS [3]. This misalignment must > be resolved before any of these documents are published. > > [Note: I'll start a thread with the corresponding WGS, Authors, Shepherds, > Chairs and ADs. Let's please discuss this point there.] > > This document uses the following definition in §2: "We call "MPLS Control Plane > Client (MCC)" any control plane entity installing forwarding entries in the > MPLS data plane. IGPs with SR extensions...are examples of MCCs." > > The focus of the IGP drafts is on the transport of the SR information, and not > on other functions (see below). Which component is responsible for what is the > point that needs clarification -- either in this document, the IGP drafts, or > both. > > These are some specific cases: > > (1.1) §2.4 (Mapping a SID Index to an MPLS label): "The following rules MUST be > applied by the MCC when calculating the MPLS label value corresponding the SID > index value "I"." There's nothing in the IGP extension documents that point at > this set of rules, and only a passing reference in the OSPF documents about > outgoing labels. > > (1.2) §2.5 (Incoming Label Collision) also assumes more functions from an MCC > than what the IGP documents do. For example: "Within an MCC, apply > tie-breaking rules to select one FEC only and assign the label to it." > > (1.3) §2.8 also expects work by the IGPs: "the MCC is responsible for > downloading the correct label value to FIB"...in this case not just calculating > the label, but installing it in the FIB. > > (1.4) §2.10.1: "The method by which the MCC on router "R0" determines that PUSH > or CONTINUE operation must be applied using the SID "Si" is beyond the scope of > this document. An example of a method to determine the SID "Si" for PUSH > operation is the case where IS-IS > [I-D.ietf-isis-segment-routing-extensions]..." Note that the IS-IS draft (or > the OSPF ones, for that matter) don't talk about how to determine the operation > -- if that is out of scope of this document, then where is it specified? #Ahmed Martin (thanks a lot) replied to these points. I hope his reply is satisfactory > > (1.5) From §2: > > An implementation SHOULD check that an IGP node-SID is not associated > with a prefix that is owned by more than one router within the same > routing domain. If so, it SHOULD NOT use this Node-SID, MAY use > another one if available, and SHOULD log an error. > > rfc8402 reads (§3.2): "An IGP Node-SID MUST NOT be associated with a prefix > that is owned by more than one router within the same routing domain." The > text above is not in line with that (MUST NOT vs SHOULD). Also, how can > "SHOULD check" be Normatively enforced? #Ahmed: I removed the paragraph since I agree that RFC8402 is sufficient > Both sentences above seem to be trying to specify a behavior for the IGPs. > > [1] https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions > [2] > https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions > [3] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions > > (2) §2.5.1: According to §2.5, a "tie-breaking rule MUST be deterministic". > However, the specification of the default rules are not: the first step uses > the administrative distance, but the specification says that "the FEC types are > ordered using the default administrative distance ordering defined by the > implementation"...and later that the "user SHOULD ensure that the same > administrative distance preference is used on all routers". The combination of > different implementations and the lack of an absolute requirement to ensure > consistency can easily be non-deterministic. > > This point is related to the text in §2.6 which talks about how "the ingress > node MUST resolve" collisions the same way. Because of the lack of an absolute > requirement for consistency, this "MUST" doesn't guarantee the same result. #Ahmed: I think there is a misunderstanding in this point. The objective of the tie breaking rules as mentioned in the 3rd paragraph in page 9 is determinism on any given router. I.e. on any router, if the same set of FECs are mapped to a label "L1", then that label L1 is assigned the same FEC irrespective of the order by which the FECs-to-label mappings are received. Hence even if different routers have different administrative distances (default or otherwise), if a router receives the mappings from the same set of FECs to the same label "L1", the router will always assign the same FEC to the label "L1" irrespective of the order by which these mappings are received Hence the whether routers use the same or different administrative distances has no bearing on deterministically assigning the same label to the same FEC on each router. The tie-breaking rules as they are written in the draft will result in determinism on any given router. If you think otherwise it would be great to point out the flaw(s) and we will be very happy to correct it (them) > Also related is this text in §2.5.1: "All routers in a routing domain SHOULD > use the same tie-breaking rules to maximize forwarding consistency." When > would all routers not use the same rules? It seems to me that forwarding > consistency is very important and would want to be maximized all the time. > IOW, why not use MUST? > > I'm making this point a DISCUSS item because it is directly related to the > ability of multiple implementations to interoperate. > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > (1) §2.2: "A global segment MUST be a label, or an index which may be mapped to > an MPLS label within the Segment Routing Global Block (SRGB)..." I don't think > this sentence fragment is clear: the intent is surely to say that the global > segment MUST be mapped within the SRGB (and not that it "MUST be a label"), > right? Suggestion: s/A global segment MUST be a label, or an index which may > be mapped/A global segment is a label, or an index which MUST be mapped #Ahmed: Actually no. It is possible that an index could not be mapped into an SRGB on some routers, e.g. because the SRGB is too small or because of incoming label collision. But I agree with the first part of the sentence so I changed it to "is" in the latest version > > (2) §2.5: "Suppose an anycast prefix...the advertisement of the prefix-SID by > some, but not all, of advertising nodes SHOULD NOT be treated as a label > collision." I'm not sure how the receiver knows if the SID was advertised "by > some, but not all"...or even if the prefix is being used as anycast. Given the > Normative language, please explain. IOW, please clarify the difference between > a duplicate prefix-SID and an anycast prefix. The use of "SHOULD NOT" above > seems to imply that there are cases when the situation should be treated as a > label collision...what are those cases? #Ahmed: You're right. I'll replace"SHOULD" with "MUST" I have not used the term "duplicate prefix-SID" anywhere. > > (3) §2.5: "The remaining FECs with the default algorithm...are installed in the > FIB...without any incoming labels..." What will these entries be used for? > Given that we're talking about an MPLS network, there may be no traffic that > matches the FEC (the traffic should be labeled)...if that is the case, then why > install in the FIB at all? OTOH, if there is a possibility that unlabeled > traffic is received, then this entry (meant for a different purpose) could be > used...also not an ideal situation. #Ahmed: I replaced "is" with "may be" > > §2.6 makes the case that in order "to minimize the chance of misforwarding, a > FEC that loses its incoming label...MUST NOT be installed in FIB". This > inconsistency adds strength to my questions above. #Ahmed: The sentence adds "based on the losing SID". This means for example it can be installed natively (e.g. pure IPv4/6 prefix) without any local or outgoing label or with a local and outgoing LDP label. > > (4) §2.5.1: "if more than one competing FEC remains after step 1, select the > smallest numerical FEC value" What value? Are you referring to the FEC type > (introduced later in this section)? If so, please be explicit and consistent. #Ahmed: I added the sentence "The numerical value of the FEC is determined according to the FEC encoding described later in this section" > > (5) §2.5.2.1: The illustration seems incomplete as the rules in §2.5.2 say that > "the receiving instance MUST compute its local label", but in this case "B > decides not to advertise any index". The second part of the example (in > §2.5.2.2) seems to complete the scenario. It seems confusing to me that the > first part shows an incomplete case...or am I misinterpreting the rules? #Ahmed: I modified the bullet after the "Else" statement in section 2.5.2. I hope this modification is satisfactory > > (6) §2.7: "PUSH, NEXT, and CONTINUE...The specifications of these operations > can be found in [RFC8402]. This sub-section specifies how to implement each of > these operations in the MPLS forwarding plane." It seems contradictory that > the specification is in two places... In any case, I think that this section > is unnecessary as it doesn't seem to add anything from what rfc8402 already > explains. #Ahmed: The section specifies more details that are requested by other members of the WG. For example it specifies the TTL and TC . It also refers to sections 2.10 and 2.11 and discusses mirror SID. But to ensure connectedness between this two document, I added the clause " As described in [RFC8402], " at the beginning of each subsection > > (7) Nits... > > s/flooding mechanisms of link state IGPs fits/flooding mechanisms of link state > IGPs fit > > s/to have a node segment to reach the node/to have a node segment reach the node > > s/per routing instance, topology, algorithm/per routing instance, topology, or > algorithm > > s/except rule/except the rule > > s/local label serves/a local label serves > > s/subTLVs/sub-TLVs > > s/Remaining FECs/The remaining FECs > > s/installed in FIB/installed in the FIB > > s/lowest value SHOULD be/lowest value SHOULD be: > > s/SR Algorithm,)/SR Algorithm) #Ahmed: Fixed (thanks a lot) > --------------B1905D9A1E6DB72FB4E18860 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Thanks a lot for the comments

See inline #Ahmed

Thanks

Ahmed

On 4/10/19 1:25 PM, Alvaro Retana via Datatracker wrote:
Alvaro Retana has entered the following ballot position for
draft-ietf-spring-segment-routing-mpls-19: Discuss

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/



----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

(1) This first point is a cross-document DISCUSS.  In short, the assumptions in
this document about what an MCC is responsible for are not in line with the
corresponding IGP drafts for OSPF [1][2] and IS-IS [3].  This misalignment must
be resolved before any of these documents are published.

[Note: I'll start a thread with the corresponding WGS, Authors, Shepherds,
Chairs and ADs.  Let's please discuss this point there.]

This document uses the following definition in §2: "We call "MPLS Control Plane
Client (MCC)" any control plane entity installing forwarding entries in the
MPLS data plane.  IGPs with SR extensions...are examples of MCCs."

The focus of the IGP drafts is on the transport of the SR information, and not
on other functions (see below).  Which component is responsible for what is the
point that needs clarification -- either in this document, the IGP drafts, or
both.

These are some specific cases:

(1.1) §2.4 (Mapping a SID Index to an MPLS label): "The following rules MUST be
applied by the MCC when calculating the MPLS label value corresponding the SID
index value "I"."  There's nothing in the IGP extension documents that point at
this set of rules, and only a passing reference in the OSPF documents about
outgoing labels.

(1.2) §2.5 (Incoming Label Collision) also assumes more functions from an MCC
than what the IGP documents do.  For example: "Within an MCC, apply
tie-breaking rules to select one FEC only and assign the label to it."

(1.3) §2.8 also expects work by the IGPs: "the MCC is responsible for
downloading the correct label value to FIB"...in this case not just calculating
the label, but installing it in the FIB.

(1.4) §2.10.1: "The method by which the MCC on router "R0" determines that PUSH
or CONTINUE operation must be applied using the SID "Si" is beyond the scope of
this document. An example of a method to determine the SID "Si" for PUSH
operation is the case where IS-IS
[I-D.ietf-isis-segment-routing-extensions]..." Note that the IS-IS draft (or
the OSPF ones, for that matter) don't talk about how to determine the operation
-- if that is out of scope of this document, then where is it specified?
#Ahmed
Martin (thanks a lot) replied to these points. I hope his reply is satisfactory

(1.5) From §2:

   An implementation SHOULD check that an IGP node-SID is not associated
   with a prefix that is owned by more than one router within the same
   routing domain. If so, it SHOULD NOT use this Node-SID, MAY use
   another one if available, and SHOULD log an error.

rfc8402 reads (§3.2): "An IGP Node-SID MUST NOT be associated with a prefix
that is owned by more than one router within the same routing domain."  The
text above is not in line with that (MUST NOT vs SHOULD).  Also, how can
"SHOULD check" be Normatively enforced?
#Ahmed: I removed the paragraph since I agree that RFC8402 is sufficient
Both sentences above seem to be trying to specify a behavior for the IGPs.

[1] https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions
[2]
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions
[3] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions

(2) §2.5.1: According to §2.5, a "tie-breaking rule MUST be deterministic". 
However, the specification of the default rules are not: the first step uses
the administrative distance, but the specification says that "the FEC types are
ordered using the default administrative distance ordering defined by the
implementation"...and later that the "user SHOULD ensure that the same
administrative distance preference is used on all routers".  The combination of
different implementations and the lack of an absolute requirement to ensure
consistency can easily be non-deterministic.

This point is related to the text in §2.6 which talks about how "the ingress
node MUST resolve" collisions the same way.  Because of the lack of an absolute
requirement for consistency, this "MUST" doesn't guarantee the same result.
#Ahmed:
I think there is a misunderstanding in this point. The objective of the tie breaking rules as mentioned in the 3rd paragraph in page 9 is determinism on any given router. I.e. on any router, if the same set of FECs are mapped to a label "L1", then that label L1 is assigned the same FEC irrespective of the order by which the FECs-to-label mappings are received. Hence even if different routers have different administrative distances (default or otherwise), if  a router receives the mappings from the same set of FECs to the same  label "L1", the router will always assign the same FEC to the label "L1" irrespective of the order by which these mappings are received
Hence the whether routers use the same or different administrative distances has no bearing on deterministically assigning the same label to the same FEC on each router.

The tie-breaking rules as they are written in the draft will result in determinism on any given router. If you think otherwise it would be great to point out the flaw(s) and we will be very happy to correct it (them)

Also related is this text in §2.5.1: "All routers in a routing domain SHOULD
use the same tie-breaking rules to maximize forwarding consistency."  When
would all routers not use the same rules?  It seems to me that forwarding
consistency is very important and would want to be maximized all the time. 
IOW, why not use MUST?

I'm making this point a DISCUSS item because it is directly related to the
ability of multiple implementations to interoperate.


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

(1) §2.2: "A global segment MUST be a label, or an index which may be mapped to
an MPLS label within the Segment Routing Global Block (SRGB)..."  I don't think
this sentence fragment is clear: the intent is surely to say that the global
segment MUST be mapped within the SRGB (and not that it "MUST be a label"),
right?  Suggestion: s/A global segment MUST be a label, or an index which may
be mapped/A global segment is a label, or an index which MUST be mapped
#Ahmed: Actually no. It is possible that an index could not be mapped into an SRGB on some routers, e.g. because the SRGB is too small or because of incoming label collision. But I agree with the first part of the sentence so I changed it to "is" in the latest version

(2) §2.5: "Suppose an anycast prefix...the advertisement of the prefix-SID by
some, but not all, of advertising nodes SHOULD NOT be treated as a label
collision."  I'm not sure how the receiver knows if the SID was advertised "by
some, but not all"...or even if the prefix is being used as anycast.  Given the
Normative language, please explain.  IOW, please clarify the difference between
a duplicate prefix-SID and an anycast prefix.  The use of "SHOULD NOT" above
seems to imply that there are cases when the situation should be treated as a
label collision...what are those cases?
#Ahmed: You're right. I'll replace"SHOULD" with "MUST"
I have not used the term "duplicate prefix-SID" anywhere.

(3) §2.5: "The remaining FECs with the default algorithm...are installed in the
FIB...without any incoming labels..."  What will these entries be used for? 
Given that we're talking about an MPLS network, there may be no traffic that
matches the FEC (the traffic should be labeled)...if that is the case, then why
install in the FIB at all?  OTOH, if there is a possibility that unlabeled
traffic is received, then this entry (meant for a different purpose) could be
used...also not an ideal situation.
#Ahmed: I replaced "is" with "may be"

§2.6 makes the case that in order "to minimize the chance of misforwarding, a
FEC that loses its incoming label...MUST NOT be installed in FIB".  This
inconsistency adds strength to my questions above.
#Ahmed: The sentence adds "based on the losing SID". This means for example it can be installed natively (e.g. pure IPv4/6 prefix) without any local or outgoing label or with a local and outgoing LDP label.

(4) §2.5.1: "if more than one competing FEC remains after step 1, select the
smallest numerical FEC value"  What value?  Are you referring to the FEC type
(introduced later in this section)?  If so, please be explicit and consistent.
#Ahmed: I added the sentence "The numerical value of the FEC is determined according to the FEC encoding described later in this section"

(5) §2.5.2.1: The illustration seems incomplete as the rules in §2.5.2 say that
"the receiving instance MUST compute its local label", but in this case "B
decides not to advertise any index".  The second part of the example (in
§2.5.2.2) seems to complete the scenario.  It seems confusing to me that the
first part shows an incomplete case...or am I misinterpreting the rules?
#Ahmed: I modified the bullet after the "Else" statement in section 2.5.2. I hope this modification is satisfactory

(6) §2.7: "PUSH, NEXT, and CONTINUE...The specifications of these operations
can be found in [RFC8402]. This sub-section specifies how to implement each of
these operations in the MPLS forwarding plane."  It seems contradictory that
the specification is in two places...  In any case, I think that this section
is unnecessary as it doesn't seem to add anything from what rfc8402 already
explains.
#Ahmed: The section specifies more details that are requested by other members of the WG. For example it specifies the TTL and TC . It also refers to sections 2.10 and 2.11 and discusses mirror SID. But to ensure connectedness between this two document, I added the clause " As described in [RFC8402], " at the beginning of each subsection

(7) Nits...

s/flooding mechanisms of link state IGPs fits/flooding mechanisms of link state
IGPs fit

s/to have a node segment to reach the node/to have a node segment reach the node

s/per routing instance, topology, algorithm/per routing instance, topology, or
algorithm

s/except rule/except the rule

s/local label serves/a local label serves

s/subTLVs/sub-TLVs

s/Remaining FECs/The remaining FECs

s/installed in FIB/installed in the FIB

s/lowest value SHOULD be/lowest value SHOULD be:

s/SR Algorithm,)/SR Algorithm)
#Ahmed: Fixed (thanks a lot)

--------------B1905D9A1E6DB72FB4E18860-- From nobody Wed Apr 17 14:48:34 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 58C6B120189; Wed, 17 Apr 2019 14:48:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <155553770429.21235.10678043482184206376@ietfa.amsl.com> Date: Wed, 17 Apr 2019 14:48:24 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-mpls-21.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2019 21:48:25 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Segment Routing with MPLS data plane Authors : Ahmed Bashandy Clarence Filsfils Stefano Previdi Bruno Decraene Stephane Litkowski Rob Shakir Filename : draft-ietf-spring-segment-routing-mpls-21.txt Pages : 38 Date : 2019-04-17 Abstract: Segment Routing (SR) leverages the source routing paradigm. A node steers a packet through a controlled set of instructions, called segments, by prepending the packet with an SR header. In the MPLS dataplane, the SR header is instantiated through a label stack. This document specifies the forwarding behavior to allow instantiating SR over the MPLS dataplane. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-21 https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-mpls-21 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-mpls-21 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 Apr 17 14:50:17 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5126120191; Wed, 17 Apr 2019 14:50:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BirIzkfQlaSy; Wed, 17 Apr 2019 14:50:06 -0700 (PDT) Received: from mail-oi1-x236.google.com (mail-oi1-x236.google.com [IPv6:2607:f8b0:4864:20::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 84966120189; 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Wed, 17 Apr 2019 14:50:05 -0700 (PDT) Received: from Abbass-MacBook-Pro.local ([2602:306:3005:53e0:8597:24fb:6768:7826]) by smtp.gmail.com with ESMTPSA id q19sm27029otf.81.2019.04.17.14.50.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 14:50:05 -0700 (PDT) To: Alvaro Retana , "draft-ietf-ospf-ospfv3-segment-routing-extensions.all@ietf.org" , "draft-ietf-spring-segment-routing-mpls.all@ietf.org" , "draft-ietf-isis-segment-routing-extensions.all@ietf.org" , "draft-ietf-ospf-segment-routing-extensions.all@ietf.org" , "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" Cc: "lsr@ietf.org" , SPRING WG References: From: Ahmed Bashandy Message-ID: <52ef0f6e-8387-0e85-2ae8-6a8b1e6a9ffd@gmail.com> Date: Wed, 17 Apr 2019 14:50:03 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------E3414CB4027DE512C6135E7D" Content-Language: en-US Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) (draft-ietf-ospf-segment-routing-extensions / draft-ietf-ospf-ospfv3-segment-routing-extensions / draft-ietf-isis-segment-routing-extensions) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2019 21:50:09 -0000 This is a multi-part message in MIME format. --------------E3414CB4027DE512C6135E7D Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Version 21 of the draft has just been uploaded, I removed the sentence “IGPs with SR extensions...are examples of MCCs.”. as you suggested since I overlooked removing it in version 20 which was uploaded few hours ago Thanks Ahmed On 4/10/19 3:05 PM, Alvaro Retana wrote: > On April 10, 2019 at 5:46:56 PM, Vigoureux, Martin (Nokia - > FR/Paris-Saclay) (martin.vigoureux@nokia.com > ) wrote: > > Martin: > > Hi! >> >> It looks to me that you don’t disagree with what is written in the >> draft but rather with the fact that the draft may suggest that IGPs >> should do things which are in fact not specified in the IGPs drafts. >> I think this point covers 1.1 to 1.4 >> >> Assuming that I’m correct, I believe that in order to clear the >> misunderstanding authors could simply remove the sentence: “IGPs with >> SR extensions...are examples of MCCs.”. >> > …and probably clean up some other text, for example, §2.10.1 > references I-D.ietf-isis-segment-routing-extensions specifically. > > Bottom line, I think you’re right. > >> On 1.5. I don’t think there is a conflict. It does not contradict >> 8402. It is not saying “An IGP Node-SID SHOULD NOT be associated with >> a prefix …” >> >> The way I see it is that this is a belt and suspenders approach. The >> base req says MUST NOT and this req says “check if this req is >> respected”. >> > I read this document as saying “check, but you may have reasons not > to”…  IMHO, there’s no reason to specify the behavior here again, if > it’s already specified in rfc8402. > >> Of course this is only my view. I expect authors to have their own. >> > I’m sure they will. ;-) > > Thanks! > > Alvaro. > --------------E3414CB4027DE512C6135E7D Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Version 21 of the draft has just been uploaded, I removed the sentence  “IGPs with SR extensions...are examples of MCCs.”.

as you suggested since I overlooked removing it in version 20 which was uploaded few hours ago

Thanks

Ahmed
On 4/10/19 3:05 PM, Alvaro Retana wrote:
On April 10, 2019 at 5:46:56 PM, Vigoureux, Martin (Nokia - FR/Paris-Saclay) (martin.vigoureux@nokia.com) wrote:

Martin:

Hi!

It looks to me that you don’t disagree with what is written in the draft but rather with the fact that the draft may suggest that IGPs should do things which are in fact not specified in the IGPs drafts. I think this point covers 1.1 to 1.4

Assuming that I’m correct, I believe that in order to clear the misunderstanding authors could simply remove the sentence: “IGPs with SR extensions...are examples of MCCs.”.

…and probably clean up some other text, for example, §2.10.1 references I-D.ietf-isis-segment-routing-extensions specifically.

Bottom line, I think you’re right.

On 1.5. I don’t think there is a conflict. It does not contradict 8402. It is not saying “An IGP Node-SID SHOULD NOT be associated with a prefix …”

The way I see it is that this is a belt and suspenders approach. The base req says MUST NOT and this req says “check if this req is respected”.

I read this document as saying “check, but you may have reasons not to”…  IMHO, there’s no reason to specify the behavior here again, if it’s already specified in rfc8402.

Of course this is only my view. I expect authors to have their own.

I’m sure they will. ;-)

Thanks!

Alvaro.


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([2600:1003:b027:ef02:f445:be7e:a3e0:6382]) by smtp.gmail.com with ESMTPSA id s54sm387824qtb.83.2019.04.17.18.53.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 18:53:53 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-093AF945-5445-45AC-8DEE-D6A77E927E5A Mime-Version: 1.0 (1.0) From: Gyan Mishra X-Mailer: iPhone Mail (16D57) In-Reply-To: <16253F7987E4F346823E305D08F9115AAB87D931@nkgeml514-mbx.china.huawei.com> Date: Wed, 17 Apr 2019 21:53:53 -0400 Cc: IPv6 List , "draft-ietf-6man-segment-routing-header@ietf.org" , "spring@ietf.org" Content-Transfer-Encoding: 7bit Message-Id: References: <16253F7987E4F346823E305D08F9115AAB87D931@nkgeml514-mbx.china.huawei.com> To: Xiejingrong Archived-At: Subject: Re: [spring] Section 4.3.1.2. Upper-layer Header or No Next Header of X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 01:54:01 -0000 --Apple-Mail-093AF945-5445-45AC-8DEE-D6A77E927E5A Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I am in agreement with the RFC SR requirements for no next header. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile =E2=80=93 202-734-1000 Sent from my iPhone > On Apr 15, 2019, at 4:09 AM, Xiejingrong wrote: >=20 > Hello authors, > =20 > Section 4.3.1.2. Upper-layer Header or No Next Header of doesn=E2=80=99t include the No Next Header case ?= > =20 > The SRv6-Network-programming relies heavily on the No-next-header in SRv6-= L2VPN cases. > =20 > Thanks > Jingrong > =20 > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- --Apple-Mail-093AF945-5445-45AC-8DEE-D6A77E927E5A Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable I am in agreement with the RFC SR requireme= nts for no next header.


Gyan S. Mishra
IT Network E= ngineering & Technology Consultant
Routing & Switching / Service Prov= ider MPLS & IPv6 Expert
www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT<= /div>
Mobile =E2= =80=93 202-734-1000


Sent from my iPhone

On Apr= 15, 2019, at 4:09 AM, Xiejingrong <xiejingrong@huawei.com> wrote:

=

Hello authors,=

 

Section 4.3.1.2. Upper-layer Hea= der or No Next Header of <draft-ietf-6man-segment-routing-header-18> d= oesn=E2=80=99t include the No Next Header case ?

 

The SRv6-Network-programming rel= ies heavily on the No-next-header in SRv6-L2VPN cases.

=

 

Thanks

Jingrong

 

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= --Apple-Mail-093AF945-5445-45AC-8DEE-D6A77E927E5A-- From nobody Wed Apr 17 19:00:15 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EDDC0120288; Wed, 17 Apr 2019 19:00:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.009 X-Spam-Level: X-Spam-Status: No, score=-0.009 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BBr25t2RPHWV; Wed, 17 Apr 2019 19:00:03 -0700 (PDT) Received: from mail-qk1-x742.google.com (mail-qk1-x742.google.com [IPv6:2607:f8b0:4864:20::742]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 092DF12029D; Wed, 17 Apr 2019 19:00:02 -0700 (PDT) Received: by mail-qk1-x742.google.com with SMTP id s83so304444qke.3; Wed, 17 Apr 2019 19:00:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=apwRvFbJHIZmrPFtFzS2YG0EWBSQhmsdKCjkxOf8djI=; b=IM6ciqWKeg3VLbWhA7mX2qewIIkN7EDSmDvl31RzsucmD7GlnMWkuO5woDE7Qkxt0m TOZOMiBWyFOU29L0k670t0coRA/gb5G0rP5TNrcPsRxEr5EwqL/aR0QmNFwCA5LDgRkn XMpegBM5UrEQ/vtrW/RqKl8cDRWgeYiugHSg5Ezb3bPpkR6dqY3hkRaTn60magvWR+D9 fPavUr18uV5SPRDl0EHztT265CrT3T14FuBJZTbm1l5Lnq3/mpHkxchmJCctz5/3LOn2 JRaIyXZvzTOZOb50UK4sEDUlyuWj45ZOf9iy9O0fnWly54yhC8vVgjOiK5MQ0wsnC+d+ XUYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=apwRvFbJHIZmrPFtFzS2YG0EWBSQhmsdKCjkxOf8djI=; b=D5lhLKAwGbxz63J/2zDLEIyufw6hK8nWhJJej7vSvb/iALCx4K/sYg6qJQ3gD6Wql6 FD88mkvQlBOjT33nMU03VMkYqhcKv3p2elEDZK3i1eJ2WeIwzG5aOw9TsmabS0cna+J5 BhgQDvGSb572iFhS89Dr8h1HgIkj4Ox2j8uKvpuJW12dTP7BkeuY2x2Wvi3RNNZcLstX J/Y1VpDzAavUpfCROThJ0au+PizCIISjO8MvNu3y+VzvMwDVQmfU934n669Qd8Ac1K9T 2y7vDJQIAaRKSfUzyLKumx+JmyqTDO2hw6At42BfwzlwDZD5Ie2mRhIN66gqw5kdMc2y kv9A== X-Gm-Message-State: APjAAAXi+0VcpABmLf8UgKIE+yLeUNBJ3dyMeVOojoAzKwt4uZOS0ffm +rjYMsWMY5tzAaHQYHMdHMdikV1W X-Google-Smtp-Source: APXvYqyYAhLH3j/rI1PLH2UbYUUinZAbUJs3gtDVQfTKdmYnw4v+Z8ydq7ikabfqCfUgsy4ZS7ND8g== X-Received: by 2002:a37:553:: with SMTP id 80mr71586921qkf.243.1555552800769; Wed, 17 Apr 2019 19:00:00 -0700 (PDT) Received: from ?IPv6:2600:1003:b027:ef02:f445:be7e:a3e0:6382? ([2600:1003:b027:ef02:f445:be7e:a3e0:6382]) by smtp.gmail.com with ESMTPSA id t30sm286299qkj.56.2019.04.17.18.59.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 18:59:59 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-A86F88CE-54D6-4935-B390-06C2222A1DFB Mime-Version: 1.0 (1.0) From: Gyan Mishra X-Mailer: iPhone Mail (16D57) In-Reply-To: Date: Wed, 17 Apr 2019 21:59:58 -0400 Cc: Robert Raszuk , Tom Herbert , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Transfer-Encoding: 7bit Message-Id: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> References: To: Ron Bonica Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 02:00:07 -0000 --Apple-Mail-A86F88CE-54D6-4935-B390-06C2222A1DFB Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I agree to make the SID align on word boundaries but I am thinking the softw= are should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile =E2=80=93 202-734-1000 Sent from my iPhone > On Apr 14, 2019, at 7:54 PM, Ron Bonica wrote: >=20 > Hi Robert, > =20 > In order to make the CRH ASIC-friendly, we have the following constraints:= > =20 > Support only a small handful of SID lengths > If at all possible, make them align on word boundaries > =20 > Currently, we support 8, 16 and 32 bytes. Do you see a reason why we shoul= d support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? > =20 > Ron > =20 > =20 > =20 > Juniper Internal > From: spring On Behalf Of Robert Raszuk > Sent: Friday, April 12, 2019 6:13 PM > To: Tom Herbert > Cc: SPRING WG ; ipv6@ietf.org; Mark Smith ; Dino Farinacci ; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh > =20 > Hi Tom, > =20 > I already suggested this on March 30th ...=20 > =20 > "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " > =20 > No feedback/response was received from authors.=20 > =20 > Thx, > R. > =20 > On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote:= > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wrot= e: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary= and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 n= etwork. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family sup= port in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control plan= e is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to request= specific behavior via programmed functions of network elements on a per flo= w basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will c= all it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new m= apping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinatio= n Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing p= roposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP al= lowing not only very good mapping plane, but also data plane integration. CC= -ing lisp authors for their comments. Note also work for integrating SRv6 wi= th LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something w= hich already exists instead of defining some sort of new from scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, >=20 > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. >=20 > Tom >=20 > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used a= > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP= or Vector Routing as an alternative options. I really do not see a room or n= eed for yet one more mapping plane. What problem does it solve which would n= ot be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional p= er SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce con= trol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that informa= tion or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then pu= shing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in cont= rol plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform SR= in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, mo= dification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5= 838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > --------------------------------------------------------------------= > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf...org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > --------------------------------------------------------------------= > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- --Apple-Mail-A86F88CE-54D6-4935-B390-06C2222A1DFB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable

I agree to make the SID= align on word boundaries but I am thinking the software should have hardwar= e independence if at all possible.

I think 32 bit i= s a reasonable size.


Gyan S. Mishra
<= div>IT Network Eng= ineering & Technology Consultant
Routing & Switching / Service Provid= er MPLS & IPv6 Expert


Sent from my iPhone

On Apr 14, 2= 019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:

<= /div>
=

Hi Rob= ert,

&= nbsp;

In ord= er to make the CRH ASIC-friendly, we have the following constraints:

&= nbsp;

  • Support only a small handful of SID lengths=
  • If at all possible, make them align on word= boundaries

&= nbsp;

Curren= tly, we support 8, 16 and 32 bytes. Do you see a reason why we should suppor= t a length greater than 32? Is there some length less than 32 that would be b= eneficial?

&= nbsp;

 =             &nbs= p;            &n= bsp;            =             &nbs= p; Ron

&= nbsp;

&= nbsp;

 

Juniper Internal<= /o:p>

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herber= tland.com>
Cc: SPRING WG <spring@ietf.org<= /a>>; ipv6@ietf.org; Mark Smith <= markzzzsmith@gmail.com>; Di= no Farinacci <farinacci@gmail.com<= /a>>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh

 

Hi Tom,

 

I already suggested this on March 30th ... =

 

"PS. But if you choose to go ahead with CRH I would highly adv= ise to make your CRH SID a variable length. "

 

No feedback/response was received from authors. <= /p>

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com= > wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote:
> > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR in= an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite car= rying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address = Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals o= f SR.
> > >
> > > I think SR while indeed started with the story of "less contr= ol plane is good for you" now clearly has evolved into not only reduction of= control plane but what can be even more important to some users ability to r= equest specific behavior via programmed functions of network elements on a per flow basis without actually per flow= or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure some= will call it overload of data plane or . There is no one size fits all.
= > > >
> > > With that let's observe that till today SR did not require an= y new mapping plane to be distributed in control plane and to be inserted in= to data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional n= etwork functionality is being taken away from SRH and is being shifted to De= stination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector Ro= uting proposal that we have one already it is called BGP. One needs to also o= bserve that we as industry worked number of years of protocol suite called L= ISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comme= nts. Note also work for integrating SRv6 with LISP which is already is publi= shed.
> > >
> > > Since you correctly observed that now SID can be 32 bit and t= hat is similar to the size of IPv4 my fundamental question is why not use so= mething which already exists instead of defining some sort of new  from= scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can yo= u
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size
= > for IPv6 for a while now (since inserting EHs came up), and thought
= > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to
= > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various<= br> > sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR us= ed a
> > fixed size format for SIDs instead of a variable length format lik= e
> > that described in RFC6554? Similarly, why does SR define it's own T= LV
> > format instead of using Hop-by-Hop and Destination Options defined= in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH a= nd LISP or Vector Routing as an alternative options. I really do not see a r= oom or need for yet one more mapping plane. What problem does it solve which= would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which require= additional per SR path state in both control plane and now in data plane ar= e really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to r= educe control plane state and processing. The trade-off for reduced control p= lane state and processing is to instead carry and encode most or all of that= information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensiv= e, then pushing some of that information and processing back into the contro= l plane should be ok, as long as there is still a beneficial overall reducti= on in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet= boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to= perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses, t= hat may also create some opportunities to leverage IPv4 support in existing p= rotocols to suite carrying and processing 32 bit SIDs with some, possibly sl= ight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leveraged= to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > -------------------------------------------------------------= -------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf.= ..org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > -------------------------------------------------------------= -------

--------= ------------------------------------------------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
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= --Apple-Mail-A86F88CE-54D6-4935-B390-06C2222A1DFB-- From nobody Wed Apr 17 20:03:14 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 628F5120293 for ; Wed, 17 Apr 2019 20:03:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SnU01zkWp8wx for ; Wed, 17 Apr 2019 20:02:58 -0700 (PDT) Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 64D86120292 for ; Wed, 17 Apr 2019 20:02:55 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id v20so652152qtv.12 for ; Wed, 17 Apr 2019 20:02:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=sBBBVQ8Cy8NV1N8lgyAqBey9Yo3TzSBOTPM4Tv9h4po=; b=e1vHfxMkzW6ZmQfx93lsgbwkwPi1dZSIF6aHIt/fMDKiqO4mNwaK5sDb/WbZAvH/0I 0fnwnxE9/JHuwKuqVJhZhQHDRVsveZQp+TGQLaV2ap13pE3hN3HZDQYihpFmhUtBIPrl mZT7N9eYUEyoMeFivkLGH1a5LnITOq0mkP4Xa9sQdLcCrYng5TQhFG+p0s7QNXZslbWg /XCxGcPYsbIPiMJ5CXdZNZfVNI8L0HIIpetrkHWx675FTwb6bKoJ6Q8LOodTd6sZYgdk NZaL/z7KbaSPqjd6WSeCn/GgpEEekFg6PaUpw6ssIkR0HR8GVbiBdT0BEtWdDZy18bMD iqjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=sBBBVQ8Cy8NV1N8lgyAqBey9Yo3TzSBOTPM4Tv9h4po=; b=pDukbdcyYVjC/Lo1VOlVr7S/m/hR+KuFywbf6McRaa5wbKaOIlGYV4/+NxtaqIoT3N 81SES1EucgUWKwADRXyT/J9CK4fI5md0ITYic3gEaRod+sftqeSpYmJzN6hXaeQFbZtV UYwYpm+UDxKKiqlxWFYuQb3KFY1VMDtXYIDftFh0rk7w++1TA9xRC8KbiqLkCrqmfBBD LUDNk6eQYDDMff2XWxpFDOTuA0tMD5A/cuEz0ijBfhJvzFsHyi6I/QCejNzk8DEb4F1+ +l6rudF3aj6eVqb9aoXV84tjb6ZTLXeW4QnSuzXq2NBfwvqys6IViBXciGnCT2WEIwns Kj3g== X-Gm-Message-State: APjAAAXcKt6w72K8YXc3U65q8hwVWHWtLqRPwPphrgD57mPrWWa+Zn+P LMIMYTuvBLI5TBpKdG9/qsYbr/kZSQfkA/3rucOMmg== X-Google-Smtp-Source: APXvYqwx8tR0r+0u47Jpmb20I344E+KzbCRSXr4q9BJooJSU5FXRlNynbck3lNqP0Bk0U3U26QpnEXpBmmJWIkuRtH8= X-Received: by 2002:aed:2196:: with SMTP id l22mr71120413qtc.226.1555556574195; Wed, 17 Apr 2019 20:02:54 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Tom Herbert Date: Wed, 17 Apr 2019 20:02:42 -0700 Message-ID: To: Ron Bonica Cc: Robert Raszuk , SPRING WG , "ipv6@ietf.org" , Mark Smith , Dino Farinacci , "lisp@ietf.org list" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 03:03:01 -0000 On Sun, Apr 14, 2019 at 4:55 PM Ron Bonica wrote: > > Hi Robert, > > > > In order to make the CRH ASIC-friendly, we have the following constraints= : > > > > Support only a small handful of SID lengths > If at all possible, make them align on word boundaries > > > > Currently, we support 8, 16 and 32 bytes. Do you see a reason why we shou= ld support a length greater than 32? Is there some length less than 32 that= would be beneficial? > Ron, I think the term "Compressed Routing Header" is a bit of a misnomer. It's really a "Mapped Routing Header" where the SIDs are presumably smaller that the addresses that they map to. But, mapping requires configuration and state in the network in order for it to work. For instance, if I just want to send a packet to a list of nodes by IPv6 address, it seems like I'd need to use something else besides CRH (or set up a possibly complex control plane that might be overkill for this scenario). We can do that in segment routing since it carries 128 bit addresses, but then that creates giant headers which is what we're trying to avoid in the first place. A compressed format would remove redundant information that can be reconstructed at the hops without additional state beyond what is in the packet. For instance, compressing a list of IPv6 addresses is possible if they all share a common prefix that can be compressed-- which is probably very likely in the closed domains that it seems like source routing is targeted to. Tom > > > Ron > > > > > > > > Juniper Internal > > From: spring On Behalf Of Robert Raszuk > Sent: Friday, April 12, 2019 6:13 PM > To: Tom Herbert > Cc: SPRING WG ; ipv6@ietf.org; Mark Smith ; Dino Farinacci ; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Tom, > > > > I already suggested this on March 30th ... > > > > "PS. But if you choose to go ahead with CRH I would highly advise to make= your CRH SID a variable length. " > > > > No feedback/response was received from authors. > > > > Thx, > R. > > > > On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote= : > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wro= te: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 = network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may= also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and= processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family su= pport in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control pla= ne is good for you" now clearly has evolved into not only reduction of cont= rol plane but what can be even more important to some users ability to requ= est specific behavior via programmed functions of network elements on a per= flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will = call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new = mapping plane to be distributed in control plane and to be inserted into da= ta plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network= functionality is being taken away from SRH and is being shifted to Destina= tion Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing = proposal that we have one already it is called BGP. One needs to also obser= ve that we as industry worked number of years of protocol suite called LISP= allowing not only very good mapping plane, but also data plane integration= . CC-ing lisp authors for their comments. Note also work for integrating SR= v6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is= similar to the size of IPv4 my fundamental question is why not use somethi= ng which already exists instead of defining some sort of new from scratch = ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used = a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P or Vector Routing as an alternative options. I really do not see a room o= r need for yet one more mapping plane. What problem does it solve which wou= ld not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional = per SR path state in both control plane and now in data plane are really so= mething we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce co= ntrol plane state and processing. The trade-off for reduced control plane s= tate and processing is to instead carry and encode most or all of that info= rmation or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then p= ushing some of that information and processing back into the control plane = should be ok, as long as there is still a beneficial overall reduction in c= ontrol plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary= and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform= SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may = also create some opportunities to leverage IPv4 support in existing protoco= ls to suite carrying and processing 32 bit SIDs with some, possibly slight,= modification. For example, perhaps IPv4 Address Family support in OSPFv3 (= RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------= - > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf..org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > -------------------------------------------------------------------= - From nobody Thu Apr 18 01:16:56 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D72EC1200C5; Thu, 18 Apr 2019 01:16:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.69 X-Spam-Level: X-Spam-Status: No, score=-1.69 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, 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Reflected Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-segment-routing-mpls-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 08:16:54 -0000 --_000_AM0PR03MB382832BF4AF4B85CA012ED8E9D260AM0PR03MB3828eurp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 QWhtZWQsIGFuZCBhbGwsClR3byBwb2ludHM6CgoxLiAgICAgICBJIGhhdmUgdG8gYWRtaXQgdGhh dCBJIGRpZCBub3QgaW50ZXJwcmV0IHRoZSByZXF1aXJlbWVudCBmb3IgZGV0ZXJtaW5pc3RpYyBi ZWhhdmlvciBvZiB0aGUgdGllLWJyZWFraW5nIHJ1bGVzIGluIHRoZSBkcmFmdCBhcyBsaW1pdGVk IHRvIGVhY2ggc3BlY2lmaWMgcm91dGVyOgoKYS4gIElmIHRoaXMgaXMgaW5kZWVkIHRoZSBpbnRl bnRpb24gb2YgdGhlIGF1dGhvcnMsIEkgd291bGQgc3VnZ2VzdCB0byBzdGF0ZSBpdCBleHBsaWNp 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(mail-co1nam04lp2054.outbound.protection.outlook.com [104.47.45.54]) by mx0b-00273201.pphosted.com with ESMTP id 2rxp8kggng-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Thu, 18 Apr 2019 07:01:58 -0700 Received: from BYAPR05MB4245.namprd05.prod.outlook.com (20.176.252.26) by BYAPR05MB6262.namprd05.prod.outlook.com (20.178.196.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1813.12; Thu, 18 Apr 2019 14:01:54 +0000 Received: from BYAPR05MB4245.namprd05.prod.outlook.com ([fe80::30f9:29cf:6d50:edd4]) by BYAPR05MB4245.namprd05.prod.outlook.com ([fe80::30f9:29cf:6d50:edd4%4]) with mapi id 15.20.1813.009; Thu, 18 Apr 2019 14:01:54 +0000 From: Ron Bonica To: Gyan Mishra CC: Robert Raszuk , Tom Herbert , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Thread-Topic: [spring] IPv6-compressed-routing-header-crh Thread-Index: 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b6LOk2ybIQxj0LHMsyCk34qNY6jSgrs/JCmiI2AnhE+ccvAw8lg8qGbuvh3xhF+eVDciLeQI7MrzyyEFK/HGpECiNQrdAhVem5NijsaDa8F2aor16JJb3pmhlyz8NdBxZ0Gw8YyukYSgpcM5Yhv3bFjYkVFAa65Tbv8n3Y8b6LPyAwYIO8GBqyiuGPAQoaXJtfk2yWo8RkYRqJRxv9zZZeB1Abm+mR8jh6p0HOXLDIyiEIGCP69S6Uuj1nyklFAx/ZtALtd4UUn2jJN6ioLD1S5ZNJ2RSB2Xf3AxLt0oXepFA+ANLtrTEROrWxrXbKzJhFveIFhJBdK3j6SsNNpqhUEnqLdYaZxt8WTYqlCnclSsvBgg5U3l/gq4EX+t+/3jhLhko5mEYTt+HFmMukXgHuQejIZ9HKJfqOF5nl+Xp1Y= Content-Type: multipart/alternative; boundary="_000_BYAPR05MB4245A7C3E215FF0028FE9B06AE260BYAPR05MB4245namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: be635910-6c00-4f80-cea4-08d6c40669ee X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Apr 2019 14:01:54.3868 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB6262 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-18_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904180097 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 14:02:11 -0000 --_000_BYAPR05MB4245A7C3E215FF0028FE9B06AE260BYAPR05MB4245namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID. = Ron Juniper Internal From: Gyan Mishra Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica Cc: Robert Raszuk ; Tom Herbert ; S= PRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf....org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BYAPR05MB4245A7C3E215FF0028FE9B06AE260BYAPR05MB4245namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Gyan,=

=  

Let&#= 8217;s think about how a network operator might choose a SID size….

=  

Assum= e that an MAN includes 100 routers. These routers are connected to one anot= her by infrastructure links. Each router has 20 or fewer infrastructure lin= ks.

=  

The n= etwork operator might assign one loosely routes SID to each router. These l= oosely routed SIDs have network-wide significance (i.e., the cannot be reus= ed).

=  

The n= etwork operator might also assign one strictly routed SID to each link. The= strictly routed SIDs have node-local significance only. They can be reused= from one node to another.

=  

So, i= n this case, the network operator only needs 120 SIDs. This fits in eight b= its with plenty of room for growth.

=  

Now c= onsider another network that includes 30,000 routers. Each router is connec= ted to its peers by 200 infrastructure links or fewer.  This network w= ould need 30,200 SIDs. This would fit in 16 bits.

=  

A *really big* network might require more than 32,000 SIDs. So, we suppor= t a 32-bit SID.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;            Ron<= o:p>

=  

=  

=  

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com&g= t;
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@her= bertland.com>; SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Fa= rinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org&g= t;
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but= I am thinking the software should have hardware independence if at all pos= sible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS &= ; IPv6 Expert

Mobile – 202= -734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org> w= rote:

Hi Ro= bert,

 = ;

In or= der to make the CRH ASIC-friendly, we have the following constraints:

 = ;

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

 = ;

Curre= ntly, we support 8, 16 and 32 bytes. Do you see a reason why we should supp= ort a length greater than 32? Is there some length less than 32 that would = be beneficial?

 = ;

 = ;            &n= bsp;            = ;            &n= bsp;            = ;  Ron

 = ;

 = ;

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbe= rtland.com>
Cc: SPRING WG <spring@ietf.org= >; ipv6@ietf.org; Mark Smith <markzzzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would hig= hly advise to make your CRH SID a variable length. "

 

No feedback/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:=

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

----------------------------------------------------= ----------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
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dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WP8t3Cpx6Puu for ; Thu, 18 Apr 2019 07:30:49 -0700 (PDT) Received: from mail-qt1-x843.google.com (mail-qt1-x843.google.com [IPv6:2607:f8b0:4864:20::843]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 43E62120419 for ; Thu, 18 Apr 2019 07:30:44 -0700 (PDT) Received: by mail-qt1-x843.google.com with SMTP id x12so2359066qts.7 for ; Thu, 18 Apr 2019 07:30:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=NTSQaZFa2Mf31wBt3okiQ/Q27njdUVfwUFFuDeOp8Js=; b=YffNL6byhw1UIwM90hlY5FNY4hKD9bN37u7VCRGJD87LePRrg8QqllJ1on+QlBwrQi Pm+1jI8CCUa7ZqA3rFlTh0C5jh6GhbdNoqxcghK44ysLrih9h9sFBtKQlUIoP5Ky2Qu5 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APXvYqw4yTNZAXSfGFwSnSEXTxn5z8vhlMYOQMKgEFwKosdGnMrqBeRVRu3J7jaO/S3sEh58UHRupHO1kbxNV1dpHVA= X-Received: by 2002:a0c:d1a6:: with SMTP id e35mr75379267qvh.174.1555597843154; Thu, 18 Apr 2019 07:30:43 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Robert Raszuk Date: Thu, 18 Apr 2019 16:30:29 +0200 Message-ID: To: Ron Bonica Cc: Gyan Mishra , Tom Herbert , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: multipart/alternative; boundary="000000000000dae3dc0586ced8de" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 14:30:54 -0000 --000000000000dae3dc0586ced8de Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network functions - which will be different from those functions at the encap dst which as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: > Gyan, > > > > Let=E2=80=99s think about how a network operator might choose a SID size= =E2=80=A6. > > > > Assume that an MAN includes 100 routers. These routers are connected to > one another by infrastructure links. Each router has 20 or fewer > infrastructure links. > > > > The network operator might assign one loosely routes SID to each router. > These loosely routed SIDs have network-wide significance (i.e., the canno= t > be reused). > > > > The network operator might also assign one strictly routed SID to each > link. The strictly routed SIDs have node-local significance only. They ca= n > be reused from one node to another. > > > > So, in this case, the network operator only needs 120 SIDs. This fits in > eight bits with plenty of room for growth. > > > > Now consider another network that includes 30,000 routers. Each router is > connected to its peers by 200 infrastructure links or fewer. This networ= k > would need 30,200 SIDs. This would fit in 16 bits. > > > > A **really big** network might require more than 32,000 SIDs. So, we > support a 32-bit SID. > > > > > Ron > > > > > > > > > > Juniper Internal > > *From:* Gyan Mishra > *Sent:* Wednesday, April 17, 2019 10:00 PM > *To:* Ron Bonica > *Cc:* Robert Raszuk ; Tom Herbert ; > SPRING WG ; ipv6@ietf.org; Dino Farinacci < > farinacci@gmail.com>; lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > > > I agree to make the SID align on word boundaries but I am thinking the > software should have hardware independence if at all possible. > > > > I think 32 bit is a reasonable size. > > > > > > Gyan S. Mishra > > IT Network Engineering & Technology Consultant > > Routing & Switching / Service Provider MPLS & IPv6 Expert > > www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT > > > Mobile =E2=80=93 202-734-1000 > > > > Sent from my iPhone > > > On Apr 14, 2019, at 7:54 PM, Ron Bonica < > rbonica=3D40juniper.net@dmarc.ietf.org> wrote: > > Hi Robert, > > > > In order to make the CRH ASIC-friendly, we have the following constraints= : > > > > - Support only a small handful of SID lengths > - If at all possible, make them align on word boundaries > > > > Currently, we support 8, 16 and 32 bytes. Do you see a reason why we > should support a length greater than 32? Is there some length less than 3= 2 > that would be beneficial? > > > > Ron > > > > > > > > Juniper Internal > > *From:* spring *On Behalf Of *Robert Raszuk > *Sent:* Friday, April 12, 2019 6:13 PM > *To:* Tom Herbert > *Cc:* SPRING WG ; ipv6@ietf.org; Mark Smith < > markzzzsmith@gmail.com>; Dino Farinacci ; > lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Tom, > > > > I already suggested this on March 30th ... > > > > *"**PS. But if you choose to go ahead with CRH I would highly advise to > make your CRH SID a variable length. "* > > > > No feedback/response was received from authors. > > > > Thx, > R. > > > > On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote= : > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y > and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 > network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and > processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family > support in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control > plane is good for you" now clearly has evolved into not only reduction of > control plane but what can be even more important to some users ability t= o > request specific behavior via programmed functions of network elements on= a > per flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will > call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new > mapping plane to be distributed in control plane and to be inserted into > data plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network > functionality is being taken away from SRH and is being shifted to > Destination Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing > proposal that we have one already it is called BGP. One needs to also > observe that we as industry worked number of years of protocol suite call= ed > LISP allowing not only very good mapping plane, but also data plane > integration. CC-ing lisp authors for their comments. Note also work for > integrating SRv6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is > similar to the size of IPv4 my fundamental question is why not use > something which already exists instead of defining some sort of new from > scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used = a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P > or Vector Routing as an alternative options. I really do not see a room o= r > need for yet one more mapping plane. What problem does it solve which wou= ld > not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional > per SR path state in both control plane and now in data plane are really > something we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce > control plane state and processing. The trade-off for reduced control pla= ne > state and processing is to instead carry and encode most or all of that > information or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then > pushing some of that information and processing back into the control pla= ne > should be ok, as long as there is still a beneficial overall reduction in > control plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perfor= m > SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to leverage IPv4 support in existing > protocols to suite carrying and processing 32 bit SIDs with some, possibl= y > slight, modification. For example, perhaps IPv4 Address Family support in > OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------= - > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf....org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > > -------------------------------------------------------------------= - > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- > > --000000000000dae3dc0586ced8de Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Ron,

I must observe that your analys= is is incorrect.=C2=A0

SIDs are not only used for = TE or traffic steering purposes but what is even more interesting for vario= us functions - for example NFV.=C2=A0

So you need = as much SIDs as possible imagination of your value add network functions - = which will be different from those functions at the encap dst which as you = indicate in other draft can be carried in destination options.=C2=A0
<= div>
That debate is still I think open.=C2=A0

<= /div>
Thx,
R.


On Thu, Apr 18, 2019 at 4:0= 2 PM Ron Bonica <rbonica@juniper.= net> wrote:

= Gyan,

= =C2=A0

= Let=E2=80=99s think about how a network operator might choose a SID size=E2= =80=A6.

= =C2=A0

= Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links.

= =C2=A0

= The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused).

= =C2=A0

= The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another.

= =C2=A0

= So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth.

= =C2=A0

= Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer.=C2=A0 This netw= ork would need 30,200 SIDs. This would fit in 16 bits.

= =C2=A0

= A *really big* network might require more than 32,000 SIDs. So, we s= upport a 32-bit SID.

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Ron

= =C2=A0

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; = Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

=C2=A0

I agree to make the SID align on word boundaries but= I am thinking the software should have hardware independence if at all pos= sible.

=C2=A0

I think 32 bit is a reasonable size.

=C2=A0

=C2=A0

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS &= ; IPv6 Expert

Mobile =E2=80=93=C2=A0202-734-1000

=C2=A0

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

= Hi Robert,

= =C2=A0

= In order to make the CRH ASIC-friendly, we have the following constraints:<= /span>

= =C2=A0

  • Support only a small handful of SID lengths<= /span>
  • If at all possible, make them align on word = boundaries

= =C2=A0

= Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial?

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark Smith <markzzzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com= >; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Tom,

=C2=A0

I already suggested this on March 30th ...=C2=A0<= /u>

=C2=A0

"PS. But if you choose to go ahead with CRH I would highly advise t= o make your CRH SID a variable length. "

=C2=A0

No feed= back/response was received from authors.=C2=A0

=C2=A0

Thx, R.

=C2=A0

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

----------------------------------------------------= ----------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------=

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x-microsoft-antispam-message-info: KTAGS3ZmtbOtonugef7tBPmbcHKdEYvZJjz0pxC+v3G19gG4txjeN3JktwFO17JAtjhBs+YnMiSkbWFnzpDWyjsjH4mDCzCL6r/LWK1xJmcVE2rfAq6wloO2XQPCI+4bdnQczRyPzPyMkqNtLdNBwckrFqMSjr0z9Gz1QhAkHoT7YlbmmK7C8OuFY82K5CRDvKwByy/iUibup4yYd6E1ZNi9XQgJwJhXtoGLZpI8oKhJkyc2baJkS19m2cBm6ANL7mQRdh5/uzFRwJJiTNmT02Qi33k8+0xWLmGe8cF8VsLaOvV6qVHCQLxjZUFxiraHmNiHLpAyBrAPAOqcT2rBFxaarKA5y+KVln46xCD+gKfq6fcZJChyv6rl9io7w+jkYuhKkMBDFkuNGoqn4FqgD1r+NTNXgk82RI7c3aSik7Q= Content-Type: multipart/alternative; boundary="_000_BN7PR05MB424378EE1287B03467E2B4CAAE260BN7PR05MB4243namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: d9d85b72-3dbd-4ed2-b6ee-08d6c43c973d X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Apr 2019 20:29:43.2160 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR05MB5890 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-18_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904180123 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 20:29:57 -0000 --_000_BN7PR05MB424378EE1287B03467E2B4CAAE260BN7PR05MB4243namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Robert, The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the nex= t segment. Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-bon= ica-6man-vpn-dest-opt for an example. = Ron Juniper Internal From: Robert Raszuk Sent: Thursday, April 18, 2019 10:30 AM To: Ron Bonica Cc: Gyan Mishra ; Tom Herbert ;= SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even= more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network = functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica > wrote: Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID. = Ron Juniper Internal From: Gyan Mishra > Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica > Cc: Robert Raszuk >; Tom Herber= t >; SPRING WG >; ipv6@ietf.org; Dino Fa= rinacci >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf....org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BN7PR05MB424378EE1287B03467E2B4CAAE260BN7PR05MB4243namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Rober= t,

=  

The C= ompressed Routing Header (CRH) has exactly one function. That is to route a= packet for segment to segment along an SR path. Therefore, SIDs contained = by the CRH have only one function. That is to steer packets to the next segment.

=  

Grant= ed, we may want to program a service behavior at a segment endpoint. IPv6 i= ncludes a Destination Options header that can be used to convey information= segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            &nbs= p;            &= nbsp;           &nbs= p; Ron

=  

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>=
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@h= erbertland.com>; SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino = Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org= >
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I must observe that your analysis is incorrect. = ;

 

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV. 

 

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options. 

 

That debate is still I think open. <= /p>

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net> wrote:

Gyan,

 <= /o:p>

Let’s think a= bout how a network operator might choose a SID size….

 <= /o:p>

Assume that an MAN = includes 100 routers. These routers are connected to one another by infrast= ructure links. Each router has 20 or fewer infrastructure links.

 <= /o:p>

The network operato= r might assign one loosely routes SID to each router. These loosely routed = SIDs have network-wide significance (i.e., the cannot be reused).

 <= /o:p>

The network operato= r might also assign one strictly routed SID to each link. The strictly rout= ed SIDs have node-local significance only. They can be reused from one node to another.

 <= /o:p>

So, in this case, t= he network operator only needs 120 SIDs. This fits in eight bits with plent= y of room for growth.

 <= /o:p>

Now consider anothe= r network that includes 30,000 routers. Each router is connected to its pee= rs by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

 <= /o:p>

A *really big* network might require more than 32,000 SIDs. So, we support a 32-bit SID= .

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Ron

 <= /o:p>

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but I am thinking= the software should have hardware independence if at all possible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS & IPv6 Expert<= o:p>

Mobile – 202-734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

Hi Robert,

 <= /o:p>

In order to make th= e CRH ASIC-friendly, we have the following constraints:

 <= /o:p>

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

 <= /o:p>

Currently, we suppo= rt 8, 16 and 32 bytes. Do you see a reason why we should support a length g= reater than 32? Is there some length less than 32 that would be beneficial?

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to = make your CRH SID a variable length. "

 

No feedba= ck/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:<= o:p>

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com> wro= te:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

------------------------------------------------------------------= --
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------

--_000_BN7PR05MB424378EE1287B03467E2B4CAAE260BN7PR05MB4243namp_-- From nobody Thu Apr 18 13:56:26 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7DC8E1203EE for ; Thu, 18 Apr 2019 13:56:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.011 X-Spam-Level: X-Spam-Status: No, score=-0.011 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RxqoXHR2pcpv for ; Thu, 18 Apr 2019 13:56:20 -0700 (PDT) Received: from mail-qt1-x844.google.com (mail-qt1-x844.google.com [IPv6:2607:f8b0:4864:20::844]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 562D7120397 for ; Thu, 18 Apr 2019 13:56:20 -0700 (PDT) Received: by mail-qt1-x844.google.com with SMTP id p20so3667534qtc.9 for ; Thu, 18 Apr 2019 13:56:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+bQlh236jkz61VajplMDZsGP7gkDTbu7TZ/dBqK/RE4=; b=a61XWSAGTX9uXu72EVI2e1D7s7QAyw20rQ0UwCtRKSEuLleVdrYQ6oySJItsl7G+rc mzsYT6WdaHnvqqAEYV2sMI+529t/LYLRCmuBXncHLxNTySv+wSh04jRiOp1ojHE82r+E L/Y7wyYpAatqzGLt1t8+kPw/3xW1nPHDLIcCe17xrZk+Y3eIGTzrsTH6I3pbsmzYtIAu O1dt/BmO42nRH4HCUUO3ul1YI3NIOJ6upk8tkezlf0U5qdSrHcVFa+I54YdwYF2ZfaKr PAp9f8ujF186Or3Z7s5NGZjVy805AHK8X5X5Lksh28/fQA+RB48Kvq2MA86FnIFzWDUw wm3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+bQlh236jkz61VajplMDZsGP7gkDTbu7TZ/dBqK/RE4=; b=lWbBxP7nVB28gO27fNlPz9nEHe7Hsn0wJjHJEHM3dQ+4GdaaGCH1hQZTggVSZMDwc+ xKklY4Vfu8st8XtVGKOIPRKDjnLZvLrG6rI38OkwSVlEa2Ogm7dFbEEG6Sp9kc+FtjD/ KBza36BLxhjl53K2t0fY9Q5v89rRJxwnUAZz5R6MDHGRY+H4W1cIzcxSvX5HZRLslZv+ v147hd6kH83qw9HeWqVVBl7AdvcPRKguGmeBgJZFxWrsEsHtSqHpihCUUU4hW64Av2Pw ByGByCusqHk2WdKmCZdcq7DibPi7mxqS/gqKQwW6tyviSP/PIDvErYehTyNmdWCEKIgb t1Iw== X-Gm-Message-State: APjAAAUpmhDeWRJwRyVpSklsgU1OPwZAztjVBLS9uD+LSiXn/PocmVwT OncqOpAfqQU0XKF0iSREDKRrLIjLeFj4r9R65Rko+Q== X-Google-Smtp-Source: APXvYqwT12DZasf1UXORzAD7WOqX3w4pUwtE5oEOsTmepWyog3fHfp0DIiZ/yP0F6y3vBMDU83P+aoBXDSoOIflskUQ= X-Received: by 2002:a0c:a8d5:: with SMTP id h21mr231322qvc.124.1555620979137; Thu, 18 Apr 2019 13:56:19 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Robert Raszuk Date: Thu, 18 Apr 2019 22:56:09 +0200 Message-ID: To: Ron Bonica Cc: Gyan Mishra , Tom Herbert , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: multipart/alternative; boundary="000000000000ddfd8f0586d43b87" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 20:56:24 -0000 --000000000000ddfd8f0586d43b87 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Ron, > The Compressed Routing Header (CRH) has exactly one function. That is to route a packet for > segment to segment along an SR path. Therefore, SIDs contained by the CRH have only one > function. That is to steer packets to the next segment. Indeed and that is precisely where the fundamental problem resides with your proposal. Let's take a look at RFC8402 - Segment Routing Architecture. In body of the above RFC we clearly see definition of SID to be either a topological instruction (your draft meets that requirement) or service instruction (your draft fails to meet those requirements) To illustrate along with just a basic example from RFC8402 of service instruction - different per hop behavior treatment for traversing packets to be embedded into SID. So if you are only to associate SID with topological instructions you have no way to express transit service instructions so it seems pretty obvious that your proposal does not meet basic SR network programming requirements. That means that all you can provide is subset of SR Architecture requirements so perhaps to avoid industry confusion your solution should avoid use of SID or SR references. Perhaps as Tom already also observed we should call it MRH Mapped Routing Header instead. Kind regards, Robert. On Thu, Apr 18, 2019 at 10:29 PM Ron Bonica wrote: > Robert, > > > > The Compressed Routing Header (CRH) has exactly one function. That is to > route a packet for segment to segment along an SR path. Therefore, SIDs > contained by the CRH have only one function. That is to steer packets to > the next segment. > > > > Granted, we may want to program a service behavior at a segment endpoint. > IPv6 includes a Destination Options header that can be used to convey > information segment endpoints and destination options can contain service > SIDs. These service SIDs can be as long or short as they need to be. See > draft-bonica-6man-vpn-dest-opt for an example. > > > > > Ron > > > > > > Juniper Internal > > *From:* Robert Raszuk > *Sent:* Thursday, April 18, 2019 10:30 AM > *To:* Ron Bonica > *Cc:* Gyan Mishra ; Tom Herbert < > tom@herbertland.com>; SPRING WG ; ipv6@ietf.org; Dino > Farinacci ; lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Ron, > > > > I must observe that your analysis is incorrect. > > > > SIDs are not only used for TE or traffic steering purposes but what is > even more interesting for various functions - for example NFV. > > > > So you need as much SIDs as possible imagination of your value add networ= k > functions - which will be different from those functions at the encap dst > which as you indicate in other draft can be carried in destination option= s. > > > > That debate is still I think open. > > > > Thx, > > R. > > > > > > On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: > > Gyan, > > > > Let=E2=80=99s think about how a network operator might choose a SID size= =E2=80=A6. > > > > Assume that an MAN includes 100 routers. These routers are connected to > one another by infrastructure links. Each router has 20 or fewer > infrastructure links. > > > > The network operator might assign one loosely routes SID to each router. > These loosely routed SIDs have network-wide significance (i.e., the canno= t > be reused). > > > > The network operator might also assign one strictly routed SID to each > link. The strictly routed SIDs have node-local significance only. They ca= n > be reused from one node to another. > > > > So, in this case, the network operator only needs 120 SIDs. This fits in > eight bits with plenty of room for growth. > > > > Now consider another network that includes 30,000 routers. Each router is > connected to its peers by 200 infrastructure links or fewer. This networ= k > would need 30,200 SIDs. This would fit in 16 bits. > > > > A **really big** network might require more than 32,000 SIDs. So, we > support a 32-bit SID. > > > > > Ron > > > > > > > > > > Juniper Internal > > *From:* Gyan Mishra > *Sent:* Wednesday, April 17, 2019 10:00 PM > *To:* Ron Bonica > *Cc:* Robert Raszuk ; Tom Herbert ; > SPRING WG ; ipv6@ietf.org; Dino Farinacci < > farinacci@gmail.com>; lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > > > I agree to make the SID align on word boundaries but I am thinking the > software should have hardware independence if at all possible. > > > > I think 32 bit is a reasonable size. > > > > > > Gyan S. Mishra > > IT Network Engineering & Technology Consultant > > Routing & Switching / Service Provider MPLS & IPv6 Expert > > www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT > > > Mobile =E2=80=93 202-734-1000 > > > > Sent from my iPhone > > > On Apr 14, 2019, at 7:54 PM, Ron Bonica < > rbonica=3D40juniper.net@dmarc.ietf.org> wrote: > > Hi Robert, > > > > In order to make the CRH ASIC-friendly, we have the following constraints= : > > > > - Support only a small handful of SID lengths > - If at all possible, make them align on word boundaries > > > > Currently, we support 8, 16 and 32 bytes. Do you see a reason why we > should support a length greater than 32? Is there some length less than 3= 2 > that would be beneficial? > > > > Ron > > > > > > > > Juniper Internal > > *From:* spring *On Behalf Of *Robert Raszuk > *Sent:* Friday, April 12, 2019 6:13 PM > *To:* Tom Herbert > *Cc:* SPRING WG ; ipv6@ietf.org; Mark Smith < > markzzzsmith@gmail.com>; Dino Farinacci ; > lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Tom, > > > > I already suggested this on March 30th ... > > > > *"**PS. But if you choose to go ahead with CRH I would highly advise to > make your CRH SID a variable length. "* > > > > No feedback/response was received from authors. > > > > Thx, > R. > > > > On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote= : > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y > and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 > network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and > processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family > support in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control > plane is good for you" now clearly has evolved into not only reduction of > control plane but what can be even more important to some users ability t= o > request specific behavior via programmed functions of network elements on= a > per flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will > call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new > mapping plane to be distributed in control plane and to be inserted into > data plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network > functionality is being taken away from SRH and is being shifted to > Destination Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing > proposal that we have one already it is called BGP. One needs to also > observe that we as industry worked number of years of protocol suite call= ed > LISP allowing not only very good mapping plane, but also data plane > integration. CC-ing lisp authors for their comments. Note also work for > integrating SRv6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is > similar to the size of IPv4 my fundamental question is why not use > something which already exists instead of defining some sort of new from > scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used = a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P > or Vector Routing as an alternative options. I really do not see a room o= r > need for yet one more mapping plane. What problem does it solve which wou= ld > not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional > per SR path state in both control plane and now in data plane are really > something we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce > control plane state and processing. The trade-off for reduced control pla= ne > state and processing is to instead carry and encode most or all of that > information or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then > pushing some of that information and processing back into the control pla= ne > should be ok, as long as there is still a beneficial overall reduction in > control plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perfor= m > SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to leverage IPv4 support in existing > protocols to suite carrying and processing 32 bit SIDs with some, possibl= y > slight, modification. For example, perhaps IPv4 Address Family support in > OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------= - > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf....org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > > -------------------------------------------------------------------= - > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- > > --000000000000ddfd8f0586d43b87 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Ron,

> The Compressed Routing Header (CRH) has exactly one function. That = is to route a packet for=C2=A0
> segment to segment along an S= R path. Therefore, SIDs contained by the CRH have only one=C2=A0
= > function. That is to steer packets to the next segment.
=
Indeed and that is precisely where the fundamental problem r= esides with your proposal.=C2=A0

Let's take a = look at RFC8402 -=C2=A0Segment Routing Architecture.=C2=A0

In body of the above RFC we clearly see definition of SID to be ei= ther a topological instruction (your draft meets that requirement) or servi= ce instruction (your draft fails to meet those requirements)=C2=A0

To illustrate along with just a basic example from RFC8402= of service instruction - different per hop behavior treatment for traversi= ng packets to be embedded into SID.=C2=A0

So if yo= u are only to associate SID with topological instructions you have no way t= o express transit service instructions so it seems pretty obvious that your= proposal does not meet basic SR network programming requirements.=C2=A0

That means that all you can provide is subset of SR = Architecture requirements so perhaps to avoid industry confusion your solut= ion should avoid use of SID or SR references. Perhaps as Tom already also o= bserved we should call it MRH Mapped Routing Header instead.=C2=A0

Kind=C2=A0regards,
Robert.

On T= hu, Apr 18, 2019 at 10:29 PM Ron Bonica <rbonica@juniper.net> wrote:

= Robert,

= =C2=A0

= The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the next segment.

= =C2=A0

= Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.=

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0Ron

= =C2=A0

=C2=A0

Juniper Internal

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRIN= G WG <spring@ietf.o= rg>; ipv6@ietf.or= g; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Ron,

=C2=A0

I must observe that your analysis is incorrect.=C2= =A0

=C2=A0

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV.=C2=A0

=C2=A0

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options.=C2=A0

=C2=A0

That debate is still I think open.=C2=A0

=C2=A0

Thx,

R.

=C2=A0

=C2=A0

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net= > wrote:

= Gyan,

= =C2=A0

= Let=E2=80=99s think about how a network operator might choose a SID size=E2= =80=A6.

= =C2=A0

= Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructure links.

= =C2=A0

= The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be reused).

= =C2=A0

= The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be reused from one node to another.

= =C2=A0

= So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth.

= =C2=A0

= Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer.=C2=A0 This network would need 30,200 SIDs. This would fit in 16 bits.<= /u>

= =C2=A0

= A *really big* network might require more than 32,000 SIDs. So, we s= upport a 32-bit SID.

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Ron

= =C2=A0

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

=C2=A0

I agree to make the SID align on word boundaries but= I am thinking the software should have hardware independence if at all pos= sible.

=C2=A0

I think 32 bit is a reasonable size.

=C2=A0

=C2=A0

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS &= ; IPv6 Expert

Mobile =E2=80=93=C2=A0202-734-1000

=C2=A0

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

= Hi Robert,

= =C2=A0

= In order to make the CRH ASIC-friendly, we have the following constraints:<= /span>

= =C2=A0

  • Support only a small handful of SID lengths<= /span>
  • If at all possible, make them align on word = boundaries

= =C2=A0

= Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that would be beneficial?

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Tom,

=C2=A0

I already suggested this on March 30th ...=C2=A0<= /u>

=C2=A0

"PS. But if you choose to go ahead with CRH I would highly advise t= o make your CRH SID a variable length. "

=C2=A0

No feed= back/response was received from authors.=C2=A0

=C2=A0

Thx, R.

=C2=A0

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

----------------------------------------------------= ----------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------=

--000000000000ddfd8f0586d43b87-- From nobody Thu Apr 18 14:30:34 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E4AD91203AE for ; Thu, 18 Apr 2019 14:30:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HeI-vRVCvqwR for ; Thu, 18 Apr 2019 14:30:19 -0700 (PDT) Received: from mail-qk1-x741.google.com (mail-qk1-x741.google.com [IPv6:2607:f8b0:4864:20::741]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B39571201A7 for ; Thu, 18 Apr 2019 14:30:13 -0700 (PDT) Received: by mail-qk1-x741.google.com with SMTP id k189so2025603qkc.0 for ; Thu, 18 Apr 2019 14:30:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=dB53xf/7m+ClKvNYDoernxO9Ha+p4vW4Tk9X2hjMlfA=; b=SBvcTkiBanJpjN+Qigcn8AjIcXh2ISTet2XA7vHv0Ak5Fyt+VFqnGh8DdyPC5kM1vL IUlbqTzWB/uzlXqoRqsCZBe9bCSmXz8TKxXoI/C0XB9tAED6jkbvdleRxlnOmDVkyMSd V00xHKjxE0Ni7O3CaLWmdcsn6vvRG92cx0jZJ95jxcIt0pqFxQGTkFHf7hvEtd7xIMiS ZltqJ7YWqXq1GZARHvgUc5IMBNHqNIlf8863P1oSFchVH4SrTz5iJIpWWzVCxZp6zQzo NCMQ60L4BFefCk3vVGzMAC3fit0vYu3KMkAitvNjFbDhZH56NNMwVzCvN1P03EEqGu5k dfYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=dB53xf/7m+ClKvNYDoernxO9Ha+p4vW4Tk9X2hjMlfA=; b=KNYvRmiPJvuDFb3GmYWsWhoY/oCaQIdBICCXqH00KAqVgcvF6sz4QY9zHB7mGfc1uE KlLaN06nh+Gn/4R14pdD9dbOo1ISaRmTr+DPwzcuL2s+mp6IFra7C511i1oPQHmIveF7 nPNG3GlzS/m7DrYlYO+1wp1TOjbztTQB2FllsLwy92I47LReN644skyH0pEBRud5R2QO orlL8dm+dgp4fuQoetHNEHip7/UUMBTPtN676NpPLyL9fsnEnFU2CfNGG3BEgEn2PXaZ RxId0vHxFYgzn/edmBv3siwiPkNWok2nbIZB8V75HOQzTxAvAYJd4o7jc/HVUuPRDJ94 ITbg== X-Gm-Message-State: APjAAAWE0jkJeqBNQRxSNw+ELGAahzb2QRGDdFaSjvcm64csDT8B8S1Y LfK5Tws5RCgpi1B+vZeg7dl6B46S89c5E1+uduAidw== X-Google-Smtp-Source: APXvYqxr6VmksluDv+4BOC/rValaM39qIQ+MCYZeXA4IhUe8YgUT0CiVjpvP1IQbLwdMqyBHvDaZZfkjDMDdLmb5zuo= X-Received: by 2002:a37:a34a:: with SMTP id m71mr214331qke.323.1555623012476; Thu, 18 Apr 2019 14:30:12 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Tom Herbert Date: Thu, 18 Apr 2019 14:30:00 -0700 Message-ID: To: Robert Raszuk Cc: Ron Bonica , Gyan Mishra , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 21:30:29 -0000 On Thu, Apr 18, 2019 at 1:56 PM Robert Raszuk wrote: > > Hi Ron, > > > The Compressed Routing Header (CRH) has exactly one function. That is t= o route a packet for > > segment to segment along an SR path. Therefore, SIDs contained by the C= RH have only one > > function. That is to steer packets to the next segment. > > Indeed and that is precisely where the fundamental problem resides with y= our proposal. > > Let's take a look at RFC8402 - Segment Routing Architecture. > > In body of the above RFC we clearly see definition of SID to be either a = topological instruction (your draft meets that requirement) or service inst= ruction (your draft fails to meet those requirements) > > To illustrate along with just a basic example from RFC8402 of service ins= truction - different per hop behavior treatment for traversing packets to b= e embedded into SID. > > So if you are only to associate SID with topological instructions you hav= e no way to express transit service instructions so it seems pretty obvious= that your proposal does not meet basic SR network programming requirements= . > > That means that all you can provide is subset of SR Architecture requirem= ents so perhaps to avoid industry confusion your solution should avoid use = of SID or SR references. Perhaps as Tom already also observed we should cal= l it MRH Mapped Routing Header instead. Robert, I think I was actually making the opposite argument. The routing entries in CRH are not addresses and not in themselves topological, they're values that need to be mapped at each hop. They require interpretation in the context of a shared state and network wide configuration, so effectively all CRH entries _are_ instructions. The fact that entries in CRH are defined only to map to addresses seems to be a deliberate design choice as opposed to a limitation in the design. But, assuming that one did want to allow SIDs to represent arbitrary instructions, I still don't understand why you'd need 128 bit numbers for that-- it seems like 32 or 16 bits would be enough. Tom > > Kind regards, > Robert. > > On Thu, Apr 18, 2019 at 10:29 PM Ron Bonica wrote: >> >> Robert, >> >> >> >> The Compressed Routing Header (CRH) has exactly one function. That is to= route a packet for segment to segment along an SR path. Therefore, SIDs co= ntained by the CRH have only one function. That is to steer packets to the = next segment. >> >> >> >> Granted, we may want to program a service behavior at a segment endpoint= . IPv6 includes a Destination Options header that can be used to convey inf= ormation segment endpoints and destination options can contain service SIDs= . These service SIDs can be as long or short as they need to be. See draft-= bonica-6man-vpn-dest-opt for an example. >> >> >> >> = Ron >> >> >> >> >> >> Juniper Internal >> >> From: Robert Raszuk >> Sent: Thursday, April 18, 2019 10:30 AM >> To: Ron Bonica >> Cc: Gyan Mishra ; Tom Herbert ; SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Hi Ron, >> >> >> >> I must observe that your analysis is incorrect. >> >> >> >> SIDs are not only used for TE or traffic steering purposes but what is e= ven more interesting for various functions - for example NFV. >> >> >> >> So you need as much SIDs as possible imagination of your value add netwo= rk functions - which will be different from those functions at the encap ds= t which as you indicate in other draft can be carried in destination option= s. >> >> >> >> That debate is still I think open. >> >> >> >> Thx, >> >> R. >> >> >> >> >> >> On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: >> >> Gyan, >> >> >> >> Let=E2=80=99s think about how a network operator might choose a SID size= =E2=80=A6. >> >> >> >> Assume that an MAN includes 100 routers. These routers are connected to = one another by infrastructure links. Each router has 20 or fewer infrastruc= ture links. >> >> >> >> The network operator might assign one loosely routes SID to each router.= These loosely routed SIDs have network-wide significance (i.e., the cannot= be reused). >> >> >> >> The network operator might also assign one strictly routed SID to each l= ink. The strictly routed SIDs have node-local significance only. They can b= e reused from one node to another. >> >> >> >> So, in this case, the network operator only needs 120 SIDs. This fits in= eight bits with plenty of room for growth. >> >> >> >> Now consider another network that includes 30,000 routers. Each router i= s connected to its peers by 200 infrastructure links or fewer. This networ= k would need 30,200 SIDs. This would fit in 16 bits. >> >> >> >> A *really big* network might require more than 32,000 SIDs. So, we suppo= rt a 32-bit SID. >> >> >> >> = Ron >> >> >> >> >> >> >> >> >> >> Juniper Internal >> >> From: Gyan Mishra >> Sent: Wednesday, April 17, 2019 10:00 PM >> To: Ron Bonica >> Cc: Robert Raszuk ; Tom Herbert = ; SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> >> >> I agree to make the SID align on word boundaries but I am thinking the s= oftware should have hardware independence if at all possible. >> >> >> >> I think 32 bit is a reasonable size. >> >> >> >> >> >> Gyan S. Mishra >> >> IT Network Engineering & Technology Consultant >> >> Routing & Switching / Service Provider MPLS & IPv6 Expert >> >> www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT >> >> Mobile =E2=80=93 202-734-1000 >> >> >> >> Sent from my iPhone >> >> >> On Apr 14, 2019, at 7:54 PM, Ron Bonica wrote: >> >> Hi Robert, >> >> >> >> In order to make the CRH ASIC-friendly, we have the following constraint= s: >> >> >> >> Support only a small handful of SID lengths >> If at all possible, make them align on word boundaries >> >> >> >> Currently, we support 8, 16 and 32 bytes. Do you see a reason why we sho= uld support a length greater than 32? Is there some length less than 32 tha= t would be beneficial? >> >> >> >> Ron >> >> >> >> >> >> >> >> Juniper Internal >> >> From: spring On Behalf Of Robert Raszuk >> Sent: Friday, April 12, 2019 6:13 PM >> To: Tom Herbert >> Cc: SPRING WG ; ipv6@ietf.org; Mark Smith ; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Hi Tom, >> >> >> >> I already suggested this on March 30th ... >> >> >> >> "PS. But if you choose to go ahead with CRH I would highly advise to mak= e your CRH SID a variable length. " >> >> >> >> No feedback/response was received from authors. >> >> >> >> Thx, >> R. >> >> >> >> On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote= : >> >> On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrot= e: >> > >> > Hi Tom, >> > >> > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: >> > > >> > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wr= ote: >> > > > >> > > > Hi Mark, >> > > > >> > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet bounda= ry and a 32 bit alignment, >> > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6= network. >> > > > > >> > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that ma= y also create some opportunities to >> > > > > leverage IPv4 support in existing protocols to suite carrying an= d processing 32 bit SIDs with some, possibly >> > > > > slight, modification. For example, perhaps IPv4 Address Family s= upport in OSPFv3 (RFC 5838) could be >> > > > > somehow leveraged to suit SR. >> > > > >> > > > >> > > > Thank you for describing your understanding of fundamentals of SR. >> > > > >> > > > I think SR while indeed started with the story of "less control pl= ane is good for you" now clearly has evolved into not only reduction of con= trol plane but what can be even more important to some users ability to req= uest specific behavior via programmed functions of network elements on a pe= r flow basis without actually per flow or per path signalling or state. >> > > > >> > > > Yes for some it may be very useful feature and I am sure some will= call it overload of data plane or . There is no one size fits all. >> > > > >> > > > With that let's observe that till today SR did not require any new= mapping plane to be distributed in control plane and to be inserted into d= ata plane. This is clearly a precedent. >> > > > >> > > > Furthermore as we see in companion documents all additional networ= k functionality is being taken away from SRH and is being shifted to Destin= ation Options . >> > > > >> > > > As far as mapping plane I already pointed out in my Vector Routing= proposal that we have one already it is called BGP. One needs to also obse= rve that we as industry worked number of years of protocol suite called LIS= P allowing not only very good mapping plane, but also data plane integratio= n. CC-ing lisp authors for their comments. Note also work for integrating S= Rv6 with LISP which is already is published. >> > > > >> > > > Since you correctly observed that now SID can be 32 bit and that i= s similar to the size of IPv4 my fundamental question is why not use someth= ing which already exists instead of defining some sort of new from scratch= ? >> > > > >> > > Robert, >> > > >> > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you >> > > please provide a reference? >> > > >> > >> > To clarify, I've been thinking about the idea of a smaller SID size >> > for IPv6 for a while now (since inserting EHs came up), and thought >> > about what would be a generic single size that might suit SR that >> > wasn't the same size as an IPv6 address. 32 bits seemed suitable to >> > me, although if people wanted bigger, I'd be suggesting 64 bits (not >> > entirely coincidentally the common IID size.) >> > >> > Ron and others have written this draft, which supports SIDS of various >> > sizes - 8, 16 or 32 bits - that triggered this discussion. >> > >> Mark, >> >> Why not just put a SID length field in the header (like RFC6554 but >> more generic). That would allow lengths of 1-16 bytes. Additional >> flags could be used to indicate the semantics of the entries. For >> instance, they might be actual addresses (128 bits for IPv6, 32 bits >> for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) >> where the rest of the address can be inferred, indices into a table, >> labels, etc. >> >> Tom >> >> > "The IPv6 Compressed Routing Header (CRH)" >> > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 >> > >> > Regards, >> > Mark. >> > >> > >> > > As for trying to use something that already exists, why does SR used= a >> > > fixed size format for SIDs instead of a variable length format like >> > > that described in RFC6554? Similarly, why does SR define it's own TL= V >> > > format instead of using Hop-by-Hop and Destination Options defined i= n >> > > RFC8200? >> > > >> > > Tom >> > > >> > > > It will be perfectly fine to have full proper SRv6 with SRH and LI= SP or Vector Routing as an alternative options. I really do not see a room = or need for yet one more mapping plane. What problem does it solve which wo= uld not be already solved elsewhere ? >> > > > >> > > > Kind regards, >> > > > Robert >> > > > >> > > > >> > > >>> 2) Is there an agreement that solutions which require additional= per SR path state in both control plane and now in data plane are really s= omething we should be endorsing here ? >> > > >> >> > > >> >> > > >> I think so. >> > > >> >> > > >> My understanding of what SR is fundamentally about is to reduce c= ontrol plane state and processing. The trade-off for reduced control plane = state and processing is to instead carry and encode most or all of that inf= ormation or its semantics as per-packet overhead. >> > > >> >> > > >> If the per-packet overhead becomes too large and expensive, then = pushing some of that information and processing back into the control plane= should be ok, as long as there is still a beneficial overall reduction in = control plane state and processing. >> > > >> >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perfor= m SR in an IPv6 network. >> > > >> >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may= also create some opportunities to leverage IPv4 support in existing protoc= ols to suite carrying and processing 32 bit SIDs with some, possibly slight= , modification. For example, perhaps IPv4 Address Family support in OSPFv3 = (RFC 5838) could be somehow leveraged to suit SR. >> > > >> >> > > >> Regards, >> > > >> Mark. >> > > > >> > > > ------------------------------------------------------------------= -- >> > > > IETF IPv6 working group mailing list >> > > > ipv6@ietf....org >> > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv= 6 >> > > > ------------------------------------------------------------------= -- >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- From nobody Thu Apr 18 14:43:12 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 34207120404 for ; Thu, 18 Apr 2019 14:42:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id INz4r5DpVDLk for ; Thu, 18 Apr 2019 14:42:54 -0700 (PDT) Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 96B861203F4 for ; Thu, 18 Apr 2019 14:42:51 -0700 (PDT) Received: by mail-qt1-x834.google.com with SMTP id k2so3825243qtm.1 for ; Thu, 18 Apr 2019 14:42:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=F4nVACGHNR4ExvK82YgqAizIKZW1ff+aQLDis4BxqJQ=; b=bkC9BdXpBeTtV67+NOe/ep+NUbht8N3y6/h77ECbYSRz/w7giTBu2xcJf4UJ9DXGcD ggadUBCFzQf5dQqv+eB57tiI3LM538rwih++NQsmq5PMKQXNaqGgviXAvzbjeSi61L4/ geZeDVekGG/vNdVfow92sE9gmnRRyLYpQa24wp33I4R9Twd4gCYFOb2hbS2KOerhYkfL ip4ifFuNdSXy+PwazkzRMaV321Ppbty74F5F5+pe1nVk6JnrkThCZ21rmZxZNIX53ZdX Sfe4iL5/q9Go3/rhx9jyWckVV7g2qcZchbWfu4Qg46xsKfxjssq6vyseinj3YWun3fN9 yJ/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=F4nVACGHNR4ExvK82YgqAizIKZW1ff+aQLDis4BxqJQ=; b=jFb6/Z53G2fZIG1TdZmDyT7BBGvMxzDqU3J0uxttRqOl2OnKmo6WKWVULcU3D/Dxsi 9LK2lulpuqMFhnVL9jLh7nYNnNmZYyuMrC6hlJz8X/2c2+ZDUTavGW3LFzniqVCuEvOG k8lnRKECzwPvZzVSkYvJ85aa0m+2t+CgLO9J1yTGfgcKW2sH72i9aj/FFhBe/AgItrNQ 36a/97lmweYq2DRkiJFkm3TtIufHEW34LvMOA1AMPylAArwHf2XkKIJMWoAg6Vxjlf+r 6ZPLOKzWGgG4Yhq4mGWDOqP4RsJkIPtakNMmGPFzbrCEHEB8S+rn+WIFVbBBF0frb1yQ AM1A== X-Gm-Message-State: APjAAAWCtWcyKDS8ytw8fsXSuD+t0Zdxt5Gbo6AGfRHNi4+kG3eRRyf0 /EwZ+A8rSTQX/fQvEB/d4HBHGR8CqNtwhxJXCos9rA== X-Google-Smtp-Source: APXvYqxcCQVezfx+XDHfZdat47n/pdp+0bNnF6vFxEUKjYohAflbdazN9SgW6GEjJ+VnNqTz5RyD/Vlolpq3N+zhGco= X-Received: by 2002:ac8:2899:: with SMTP id i25mr285479qti.361.1555623770570; Thu, 18 Apr 2019 14:42:50 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Robert Raszuk Date: Thu, 18 Apr 2019 23:42:24 +0200 Message-ID: To: Tom Herbert Cc: Ron Bonica , Gyan Mishra , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: multipart/alternative; boundary="0000000000003fd4da0586d4e2cb" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 21:42:56 -0000 --0000000000003fd4da0586d4e2cb Content-Type: text/plain; charset="UTF-8" Hi Tom, > The fact that entries in CRH are defined only to map to addresses seems to > be a deliberate design choice as opposed to a limitation in the design. Yes this is true - any mapping can be used to express much more then topological information. See LISP as example :) My comment was not focused on the choice of solution based on mapping (modulo embedded question do we really new one more mapping system), but to the design choice made to *only* bind it to topological instructions. With that I do think it no longer meets SR Architecture primitives. Many thx, Robert. On Thu, Apr 18, 2019 at 11:30 PM Tom Herbert wrote: > On Thu, Apr 18, 2019 at 1:56 PM Robert Raszuk wrote: > > > > Hi Ron, > > > > > The Compressed Routing Header (CRH) has exactly one function. That is > to route a packet for > > > segment to segment along an SR path. Therefore, SIDs contained by the > CRH have only one > > > function. That is to steer packets to the next segment. > > > > Indeed and that is precisely where the fundamental problem resides with > your proposal. > > > > Let's take a look at RFC8402 - Segment Routing Architecture. > > > > In body of the above RFC we clearly see definition of SID to be either a > topological instruction (your draft meets that requirement) or service > instruction (your draft fails to meet those requirements) > > > > To illustrate along with just a basic example from RFC8402 of service > instruction - different per hop behavior treatment for traversing packets > to be embedded into SID. > > > > So if you are only to associate SID with topological instructions you > have no way to express transit service instructions so it seems pretty > obvious that your proposal does not meet basic SR network programming > requirements. > > > > That means that all you can provide is subset of SR Architecture > requirements so perhaps to avoid industry confusion your solution should > avoid use of SID or SR references. Perhaps as Tom already also observed we > should call it MRH Mapped Routing Header instead. > > Robert, > > I think I was actually making the opposite argument. The routing > entries in CRH are not addresses and not in themselves topological, > they're values that need to be mapped at each hop. They require > interpretation in the context of a shared state and network wide > configuration, so effectively all CRH entries _are_ instructions. The > fact that entries in CRH are defined only to map to addresses seems to > be a deliberate design choice as opposed to a limitation in the > design. But, assuming that one did want to allow SIDs to represent > arbitrary instructions, I still don't understand why you'd need 128 > bit numbers for that-- it seems like 32 or 16 bits would be enough. > > Tom > > > > > Kind regards, > > Robert. > > > > On Thu, Apr 18, 2019 at 10:29 PM Ron Bonica wrote: > >> > >> Robert, > >> > >> > >> > >> The Compressed Routing Header (CRH) has exactly one function. That is > to route a packet for segment to segment along an SR path. Therefore, SIDs > contained by the CRH have only one function. That is to steer packets to > the next segment. > >> > >> > >> > >> Granted, we may want to program a service behavior at a segment > endpoint. IPv6 includes a Destination Options header that can be used to > convey information segment endpoints and destination options can contain > service SIDs. These service SIDs can be as long or short as they need to > be. See draft-bonica-6man-vpn-dest-opt for an example. > >> > >> > >> > >> > Ron > >> > > --0000000000003fd4da0586d4e2cb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
> The=C2=A0fact that entries in CRH are defined only to map= to addresses seems to
> be a deliberate design choice as opposed to = a limitation in the=C2=A0design.=C2=A0=C2=A0

Y= es this is true - any mapping can be used to express much more then topolog= ical information. See LISP as example :)=C2=A0

My = comment was not focused on the choice of solution based on mapping (modulo = embedded question do we really new one more mapping system), but to the des= ign choice made to *only* bind it to topological instructions. With that I = do think it no longer meets SR Architecture primitives.=C2=A0
Many thx,
Robert.


On Thu, Apr 18,= 2019 at 11:30 PM Tom Herbert <to= m@herbertland.com> wrote:
On Thu, Apr 18, 2019 at 1:56 PM Robert Raszuk <robert@raszuk.net> w= rote:
>
> Hi Ron,
>
> > The Compressed Routing Header (CRH) has exactly one function. Tha= t is to route a packet for
> > segment to segment along an SR path. Therefore, SIDs contained by= the CRH have only one
> > function. That is to steer packets to the next segment.
>
> Indeed and that is precisely where the fundamental problem resides wit= h your proposal.
>
> Let's take a look at RFC8402 - Segment Routing Architecture.
>
> In body of the above RFC we clearly see definition of SID to be either= a topological instruction (your draft meets that requirement) or service i= nstruction (your draft fails to meet those requirements)
>
> To illustrate along with just a basic example from RFC8402 of service = instruction - different per hop behavior treatment for traversing packets t= o be embedded into SID.
>
> So if you are only to associate SID with topological instructions you = have no way to express transit service instructions so it seems pretty obvi= ous that your proposal does not meet basic SR network programming requireme= nts.
>
> That means that all you can provide is subset of SR Architecture requi= rements so perhaps to avoid industry confusion your solution should avoid u= se of SID or SR references. Perhaps as Tom already also observed we should = call it MRH Mapped Routing Header instead.

Robert,

I think I was actually making the opposite argument. The routing
entries in CRH are not addresses and not in themselves topological,
they're values that need to be mapped at each hop. They require
interpretation in the context of a shared state and network wide
configuration, so effectively all CRH entries _are_ instructions. The
fact that entries in CRH are defined only to map to addresses seems to
be a deliberate design choice as opposed to a limitation in the
design. But, assuming that one did want to allow SIDs to represent
arbitrary instructions, I still don't understand why you'd need 128=
bit numbers for that-- it seems like 32 or 16 bits would be enough.

Tom

>
> Kind regards,
> Robert.
>
> On Thu, Apr 18, 2019 at 10:29 PM Ron Bonica <rbonica@juniper.net> wrote:
>>
>> Robert,
>>
>>
>>
>> The Compressed Routing Header (CRH) has exactly one function. That= is to route a packet for segment to segment along an SR path. Therefore, S= IDs contained by the CRH have only one function. That is to steer packets t= o the next segment.
>>
>>
>>
>> Granted, we may want to program a service behavior at a segment en= dpoint. IPv6 includes a Destination Options header that can be used to conv= ey information segment endpoints and destination options can contain servic= e SIDs. These service SIDs can be as long or short as they need to be. See = draft-bonica-6man-vpn-dest-opt for an example.
>>
>>
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ron
>>

--0000000000003fd4da0586d4e2cb-- From nobody Thu Apr 18 14:57:58 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7827E120475; Thu, 18 Apr 2019 14:57:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.211 X-Spam-Level: X-Spam-Status: No, score=-2.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6yGqldJ-hbP5; Thu, 18 Apr 2019 14:57:32 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 795D1120418; Thu, 18 Apr 2019 14:57:31 -0700 (PDT) Received: from lhreml705-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 34C7F59AED34F913A471; Thu, 18 Apr 2019 22:57:29 +0100 (IST) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml705-cah.china.huawei.com (10.201.108.46) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 18 Apr 2019 22:57:28 +0100 Received: from SJCEML521-MBX.china.huawei.com ([169.254.1.117]) by SJCEML702-CHM.china.huawei.com ([169.254.4.74]) with mapi id 14.03.0439.000; Thu, 18 Apr 2019 14:57:16 -0700 From: James N Guichard To: Ron Bonica , Robert Raszuk CC: SPRING WG , "ipv6@ietf.org" , "Dino Farinacci" , "lisp@ietf.org list" , James N Guichard Thread-Topic: [spring] IPv6-compressed-routing-header-crh Thread-Index: AQHU5XwSQNUFwLkE10qv/uSLYFT0BKYiu67wgAHl/gCAAB1LAIAABz2AgAC56wCAAMlxgIAS2BEAgABq6wCAABaTAIAAAQyAgANBIwCABNnsAIAAybQAgAAH/YCAAGRegP//n5KQ Date: Thu, 18 Apr 2019 21:57:15 +0000 Message-ID: References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.155.16] Content-Type: multipart/alternative; boundary="_000_BF1BE6D99B52F84AB9B48B7CF6F17DA31364F26Asjceml521mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 21:57:42 -0000 --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA31364F26Asjceml521mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Ron, I am wondering about how do you plan to handle service SIDs (or any SID wit= h embedded functions) at intermediate nodes; draft-bonica-6man-vpn-dest-opt= seems to only handle the case where the endpoint will process the destinat= ion option: Section 4 says: "It MUST NOT appear in a Hop-by-hop Options header and SHOU= LD NOT appear in a Destination Options header that precedes a Routing heade= r". If you relax the latter and encode the SID in a destination option precedin= g the CRH (or SRH) then wouldn't every node in the segment-list have to pro= cess the SID and figure out whether it is a local SID or not? That would se= em to be overly complex given you could just encode the SID in the CRH (or = SRH) and only the node where said SID is exposed would process it. Thanks! Jim From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica Sent: Thursday, April 18, 2019 4:30 PM To: Robert Raszuk Cc: SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list Subject: RE: [spring] IPv6-compressed-routing-header-crh Robert, The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the nex= t segment. Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-bon= ica-6man-vpn-dest-opt for an example. = Ron Juniper Internal From: Robert Raszuk > Sent: Thursday, April 18, 2019 10:30 AM To: Ron Bonica > Cc: Gyan Mishra >; Tom = Herbert >; SPRING WG >; ipv6@ietf.org; D= ino Farinacci >; lisp@ietf.= org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even= more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network = functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica > wrote: Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID.. = Ron Juniper Internal From: Gyan Mishra > Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica > Cc: Robert Raszuk >; Tom Herber= t >; SPRING WG >; ipv6@ietf.org; Dino Fa= rinacci >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf.....org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BF1BE6D99B52F84AB9B48B7CF6F17DA31364F26Asjceml521mbxchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Ron,

 

I am wondering about h= ow do you plan to handle service SIDs (or any SID with embedded functions) = at intermediate nodes; draft-bonica-6man-vpn-dest-opt seems to only handle = the case where the endpoint will process the destination option:

 

Section 4 says: “It MUST NOT appear in a Hop-by-ho= p Options header and SHOULD NOT appear in a Destination Options header that= precedes a Routing header”.

 

If you rel= ax the latter and encode the SID in a destination option preceding the CRH = (or SRH) then wouldn’t every node in the segment-list have to process= the SID and figure out whether it is a local SID or not? That would seem to be overly complex given you could just enco= de the SID in the CRH (or SRH) and only the node where said SID is exposed = would process it.

 = ;

Thanks!

 = ;

Jim

 

From: ipv6 [mailto:ipv6-bounces@ietf.org] = On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci= <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: RE: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Rober= t,

=  

The C= ompressed Routing Header (CRH) has exactly one function. That is to route a= packet for segment to segment along an SR path. Therefore, SIDs contained = by the CRH have only one function. That is to steer packets to the next segment.

=  

Grant= ed, we may want to program a service behavior at a segment endpoint. IPv6 i= ncludes a Destination Options header that can be used to convey information= segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            &nbs= p;            &= nbsp;           &nbs= p; Ron

=  

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@ju= niper.net>
Cc: Gyan Mishra <hayabus= agsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I must observe that your analysis is incorrect. = ;

 

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV. 

 

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options. 

 

That debate is still I think open. <= /p>

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net> wrote:

Gyan,

 <= /o:p>

Let’s think a= bout how a network operator might choose a SID size….

 <= /o:p>

Assume that an MAN = includes 100 routers. These routers are connected to one another by infrast= ructure links. Each router has 20 or fewer infrastructure links.

 <= /o:p>

The network operato= r might assign one loosely routes SID to each router. These loosely routed = SIDs have network-wide significance (i.e., the cannot be reused).

 <= /o:p>

The network operato= r might also assign one strictly routed SID to each link. The strictly rout= ed SIDs have node-local significance only. They can be reused from one node to another.

 <= /o:p>

So, in this case, t= he network operator only needs 120 SIDs. This fits in eight bits with plent= y of room for growth.

 <= /o:p>

Now consider anothe= r network that includes 30,000 routers. Each router is connected to its pee= rs by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

 <= /o:p>

A *really big* network might require more than 32,000 SIDs. So, we support a 32-bit SID= ..

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Ron

 <= /o:p>

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but I am thinking= the software should have hardware independence if at all possible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS & IPv6 Expert<= o:p>

Mobile – 202-734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

Hi Robert,

 <= /o:p>

In order to make th= e CRH ASIC-friendly, we have the following constraints:

 <= /o:p>

·       &= nbsp; Support only a small handful of SID lengths

·       &= nbsp; If at all possible, make them align on word boundaries

 <= /o:p>

Currently, we suppo= rt 8, 16 and 32 bytes. Do you see a reason why we should support a length g= reater than 32? Is there some length less than 32 that would be beneficial?

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to = make your CRH SID a variable length. "

 

No feedba= ck/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:<= o:p>

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com> wro= te:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= .....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

------------------------------------------------------------------= --
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ipv6@ietf.org
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[108.94.1.135]) by smtp.gmail.com with ESMTPSA id l49sm1206288otc.19.2019.04.18.15.04.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Apr 2019 15:04:57 -0700 (PDT) From: Dino Farinacci Message-Id: <1A4DFA66-D01C-4704-B81E-B1F02FC1A146@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_5684746F-2B66-4DD5-B766-141F89F3E8DA" Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Date: Thu, 18 Apr 2019 15:04:26 -0700 In-Reply-To: Cc: Tom Herbert , Ron Bonica , Gyan Mishra , SPRING WG , "ipv6@ietf.org" , "lisp@ietf.org list" To: Robert Raszuk References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> X-Mailer: Apple Mail (2.3445.9.1) Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2019 22:05:01 -0000 --Apple-Mail=_5684746F-2B66-4DD5-B766-141F89F3E8DA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > Yes this is true - any mapping can be used to express much more then = topological information. See LISP as example :)=20 With respect to the data-plane, the ELP (Explicit Locator Path, defined = in RFC8060 and use-cases in draft-ietf-lisp-te) RLOC-record: The L-bit, when set, means that Reencap Hop is routable by the underlay = (an RLOC). When 0, a mapping system lookup can be performed to get the = RLOC. Hence, doing what Tom commented on. Note this format above is in the *control-plane* and each node along the = segment-route(LOL)/reencapsulation path has the ELP stored apriori. My demo of SR using the LISP mapping system, these ELP formatted records = are used and registered in the mapping system. They are registered with = L-bit set to 1 and the AFI=3D2 (an IPv6 RLOC). But note, if you used this in the control-plane, there would be no = packet overhead because the destination address used to find these ELP = paths. The authors of SR already know this. FYI, Dino --Apple-Mail=_5684746F-2B66-4DD5-B766-141F89F3E8DA Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_700F2C60-ADFC-4BA9-8D06-1210BF6DFFCF" --Apple-Mail=_700F2C60-ADFC-4BA9-8D06-1210BF6DFFCF Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii
Yes = this is true - any mapping can be used to express much more then = topological information. See LISP as example :) 

With = respect to the data-plane, the ELP (Explicit Locator Path, defined in = RFC8060 and use-cases in draft-ietf-lisp-te) RLOC-record:


The L-bit, when set, means that Reencap Hop is routable by = the underlay (an RLOC). When 0, a mapping system lookup can be performed = to get the RLOC. Hence, doing what Tom commented on.

Note this format above = is in the *control-plane* and each node along the = segment-route(LOL)/reencapsulation path has the ELP stored = apriori.

My = demo of SR using the LISP mapping system, these ELP formatted records = are used and registered in the mapping system. They are registered with = L-bit set to 1 and the AFI=3D2 (an IPv6 RLOC).

But note, if you used this in the = control-plane, there would be no packet overhead because the destination = address used to find these ELP paths. The authors of SR already know = this.

FYI,
Dino


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X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB5157 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-19_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904190019 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2019 02:53:42 -0000 --_000_BYAPR05MB424592955BF0177DBFFC87F8AE270BYAPR05MB4245namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Jim, Thanks for asking this insightful question. The answer depends on the SID t= ype. Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed = only in the following conditions: * When there is no SRH * When there is an SRH and Segments Left is equal to 0 Such SIDs should be encoded in the Destination Options header that immediat= ely precedes the upper-layer header. This is because the Destination Option= s header that immediately precedes the upper-layer header is only processed= when: * When there is no SRH * When there is an SRH and Segments Left is equal to 0 Moreover, Destination options are of variable length. So, each SID can be a= s long or short as it needs to be. One SID type can be long while another i= s short and neither needs to be the same length as SIDs that are encoded in= the IPv6 Routing header. The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an e= xample of such an encoding. It serves the same purpose as many of the SID d= efined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, EN= D.DX6, END.DT4, END.DT6). As more service SIDs of this type are identified,= more destination options will be defined. Other Service SIDs can be processed when an SRH is present and Segments Lef= t is greater than zero. Ideally, these SIDs should be encoded in the Destin= ation Options Header that immediately precedes the Routing header. This is = because the Destination Options Header that immediately precedes the Routin= g header is processed by every segment endpoint. Draft-bonica-6man-seg-end-= opt offers one such encoding scheme, but it is not the only one. Another possibility is to encode these SIDs the Destination Options header = that immediately precedes the upper-layer header and required Service Funct= ion Instances that support these SIDs to look ahead. = Ron Juniper Internal From: James N Guichard Sent: Thursday, April 18, 2019 5:57 PM To: Ron Bonica ; Robert Raszuk Cc: SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list ; James N Guichard Subject: RE: [spring] IPv6-compressed-routing-header-crh Hi Ron, I am wondering about how do you plan to handle service SIDs (or any SID wit= h embedded functions) at intermediate nodes; draft-bonica-6man-vpn-dest-opt= seems to only handle the case where the endpoint will process the destinat= ion option: Section 4 says: "It MUST NOT appear in a Hop-by-hop Options header and SHOU= LD NOT appear in a Destination Options header that precedes a Routing heade= r". If you relax the latter and encode the SID in a destination option precedin= g the CRH (or SRH) then wouldn't every node in the segment-list have to pro= cess the SID and figure out whether it is a local SID or not? That would se= em to be overly complex given you could just encode the SID in the CRH (or = SRH) and only the node where said SID is exposed would process it. Thanks! Jim From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica Sent: Thursday, April 18, 2019 4:30 PM To: Robert Raszuk > Cc: SPRING WG >; ipv6@ietf.org; Dino Farinacci >; lisp@ietf.org list > Subject: RE: [spring] IPv6-compressed-routing-header-crh Robert, The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the nex= t segment. Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-bon= ica-6man-vpn-dest-opt for an example. = Ron Juniper Internal From: Robert Raszuk > Sent: Thursday, April 18, 2019 10:30 AM To: Ron Bonica > Cc: Gyan Mishra >; Tom = Herbert >; SPRING WG >; ipv6@ietf.org; D= ino Farinacci >; lisp@ietf.= org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even= more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network = functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica > wrote: Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID... = Ron Juniper Internal From: Gyan Mishra > Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica > Cc: Robert Raszuk >; Tom Herber= t >; SPRING WG >; ipv6@ietf.org; Dino Fa= rinacci >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf......org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BYAPR05MB424592955BF0177DBFFC87F8AE270BYAPR05MB4245namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Ji= m,

=  

Thank= s for asking this insightful question. The answer depends on the SID type.<= o:p>

=  

Some = service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed only = in the following conditions:

=  

  • When there is no SRH
  • When there is an SRH and Segments Left is = equal to 0

=  

Such = SIDs should be encoded in the Destination Options header that immediately p= recedes the upper-layer header. This is because the Destination Options hea= der that immediately precedes the upper-layer header is only processed when:

=  

  • When there is no SRH
  • When there is an SRH and Segments Left is = equal to 0

=  

Moreo= ver, Destination options are of variable length. So, each SID can be as lon= g or short as it needs to be. One SID type can be long while another is sho= rt and neither needs to be the same length as SIDs that are encoded in the IPv6 Routing header.

=  

The V= PN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an exampl= e of such an encoding. It serves the same purpose as many of the SID define= d in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, END.DX6, END.DT4, END.DT6). As more service SIDs of this t= ype are identified, more destination options will be defined.

=  

Other= Service SIDs can be processed when an SRH is present and Segments Left is = greater than zero. Ideally, these SIDs should be encoded in the Destination= Options Header that immediately precedes the Routing header. This is because the Destination Options Header that im= mediately precedes the Routing header is processed by every segment endpoin= t. Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is= not the only one.

=  

Anoth= er possibility is to encode these SIDs the Destination Options header that = immediately precedes the upper-layer header and required Service Function I= nstances that support these SIDs to look ahead.

=  

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;   Ron

=  

=  

 

Juniper Internal=

From: James N Guichard <james.n.guichard@h= uawei.com>
Sent: Thursday, April 18, 2019 5:57 PM
To: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert= @raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci= <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>; Jam= es N Guichard <james.n.guichard@huawei.com>
Subject: RE: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I am wondering about h= ow do you plan to handle service SIDs (or any SID with embedded functions) = at intermediate nodes; draft-bonica-6man-vpn-dest-opt seems to only handle = the case where the endpoint will process the destination option:

 

Section 4 says: “It MUST NOT appear in a Hop-by-ho= p Options header and SHOULD NOT appear in a Destination Options header that= precedes a Routing header”.

 

If you rel= ax the latter and encode the SID in a destination option preceding the CRH = (or SRH) then wouldn’t every node in the segment-list have to process= the SID and figure out whether it is a local SID or not? That would seem to be overly complex given you could just enco= de the SID in the CRH (or SRH) and only the node where said SID is exposed = would process it.

 = ;

Thanks!

 = ;

Jim

 

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@ra= szuk.net>
Cc: SPRING WG <spring@ietf.org= >; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: RE: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Rober= t,

=  

The C= ompressed Routing Header (CRH) has exactly one function. That is to route a= packet for segment to segment along an SR path. Therefore, SIDs contained = by the CRH have only one function. That is to steer packets to the next segment.

=  

Grant= ed, we may want to program a service behavior at a segment endpoint. IPv6 i= ncludes a Destination Options header that can be used to convey information= segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            &nbs= p;            &= nbsp;           &nbs= p; Ron

=  

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@ju= niper.net>
Cc: Gyan Mishra <hayabus= agsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I must observe that your analysis is incorrect. = ;

 

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV. 

 

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options. 

 

That debate is still I think open. <= /p>

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net> wrote:

Gyan,

 <= /o:p>

Let’s think a= bout how a network operator might choose a SID size….

 <= /o:p>

Assume that an MAN = includes 100 routers. These routers are connected to one another by infrast= ructure links. Each router has 20 or fewer infrastructure links.

 <= /o:p>

The network operato= r might assign one loosely routes SID to each router. These loosely routed = SIDs have network-wide significance (i.e., the cannot be reused).

 <= /o:p>

The network operato= r might also assign one strictly routed SID to each link. The strictly rout= ed SIDs have node-local significance only. They can be reused from one node to another.

 <= /o:p>

So, in this case, t= he network operator only needs 120 SIDs. This fits in eight bits with plent= y of room for growth.

 <= /o:p>

Now consider anothe= r network that includes 30,000 routers. Each router is connected to its pee= rs by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

 <= /o:p>

A *really big* network might require more than 32,000 SIDs. So, we support a 32-bit SID= ...

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Ron

 <= /o:p>

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but I am thinking= the software should have hardware independence if at all possible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS & IPv6 Expert<= o:p>

Mobile – 202-734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

Hi Robert,

 <= /o:p>

In order to make th= e CRH ASIC-friendly, we have the following constraints:

 <= /o:p>

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

 <= /o:p>

Currently, we suppo= rt 8, 16 and 32 bytes. Do you see a reason why we should support a length g= reater than 32? Is there some length less than 32 that would be beneficial?

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to = make your CRH SID a variable length. "

 

No feedba= ck/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:<= o:p>

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com> wro= te:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ......org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

------------------------------------------------------------------= --
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------

--_000_BYAPR05MB424592955BF0177DBFFC87F8AE270BYAPR05MB4245namp_-- From nobody Fri Apr 19 00:31:15 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 91A611202BF for ; Fri, 19 Apr 2019 00:31:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.01 X-Spam-Level: X-Spam-Status: No, score=-0.01 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TbbIaxs38Hbe for ; Fri, 19 Apr 2019 00:31:07 -0700 (PDT) Received: from mail-qt1-x844.google.com (mail-qt1-x844.google.com [IPv6:2607:f8b0:4864:20::844]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9795E1202BE for ; Fri, 19 Apr 2019 00:31:07 -0700 (PDT) Received: by mail-qt1-x844.google.com with SMTP id v7so1240471qti.7 for ; Fri, 19 Apr 2019 00:31:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=odSC6jtuYzqadV5kIKzbbeg2FT5UpszIc2cipPe3fls=; b=IiQu23EqSg5K90hRl6UXQmv7Xux9x1N1NQM1EthObAqQar3ICTukbqmIt78k/OfwGw 5fR6hFn1jOfIPHg3Jzc82jhnS/LugCavQEnzTGKpDcBp2MduJOlerW05F09zNh2nT5Yt 8QmhSFtrRFZ6EVppmt/TOUu3hpr7gJPCYLDaUvfkG11CybjCdb4q+BV6nlIsoBazrqRX mf2dQSssY5Xhc2NhAxF/LAZ9NGdw43fDjOuZj+UII+/0HhAVS7RDgJ5mqN/ocVo57aw8 pYCX8kpAzYqtrwp83iUDQi7YNUpTloBoehnRwv21fx7nub2yEAaQtGd69V3f2MaJs34p uwBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=odSC6jtuYzqadV5kIKzbbeg2FT5UpszIc2cipPe3fls=; b=VzoCoN4iDw8f9HiZjVBnrqbtlsasWKtHn/ZEcMxRBMRMJZEx3ENsV1nFoEEr9OSWLP AIaFmlQaCnueYg8t8OPrutsuCvuL5xZJIhrBlMUTL3TDaa+Wy4tF7La/eZoZb2sUXm5v I/zvohkNIWllEW0G0bzjKcw2FNPcRENqyUA+85f0+15gLgi8VO0P9SysyDSNfJX0xta1 Sb06+B4yJHGNnYyiGMNmpkMqCl8AYiYekCr2Bx4ApOQIPJ/nELsjVgiwb/R69l9sVqhe CSDmdU5M5TJ7vPKzZv1JQTvsb60erstIoQ208FLasVyWvL/G5tPz3Px1MI9vK6CGQV3w abeg== X-Gm-Message-State: APjAAAXGwa3cT9LHtjUJ9R4sW4DLct3WqItJLY4sCOaCF4RHYGBy1IH0 5JWQe1yuT2khlqNn6DrHPfb2zmY6x5y2ulcyiAxPuw== X-Google-Smtp-Source: APXvYqzMSkUJfUkU4a5+KwNXvlVheB2WwpUVo7849dQvf52Qs+sg/TYlbL89D+idYL3U7T4kiXbeV4HJyIY6s4wSjiI= X-Received: by 2002:ac8:fb0:: with SMTP id b45mr2160270qtk.293.1555659066432; Fri, 19 Apr 2019 00:31:06 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Robert Raszuk Date: Fri, 19 Apr 2019 09:30:56 +0200 Message-ID: To: Ron Bonica Cc: James N Guichard , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: multipart/alternative; boundary="0000000000000bf5fd0586dd1a12" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2019 07:31:13 -0000 --0000000000000bf5fd0586dd1a12 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable And what happens - - When there is an SRH and Segments Left is *not* equal to 0 ? On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica wrote: > Hi Jim, > > > > Thanks for asking this insightful question. The answer depends on the SID > type. > > > > Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processe= d > only in the following conditions: > > > > - When there is no SRH > - When there is an SRH and Segments Left is equal to 0 > > > > Such SIDs should be encoded in the Destination Options header that > immediately precedes the upper-layer header. This is because the > Destination Options header that immediately precedes the upper-layer head= er > is only processed when: > > > > - When there is no SRH > - When there is an SRH and Segments Left is equal to 0 > > > > Moreover, Destination options are of variable length. So, each SID can be > as long or short as it needs to be. One SID type can be long while anothe= r > is short and neither needs to be the same length as SIDs that are encoded > in the IPv6 Routing header. > > > > The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an > example of such an encoding. It serves the same purpose as many of the SI= D > defined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, > END.DX6, END.DT4, END.DT6). As more service SIDs of this type are > identified, more destination options will be defined. > > > > Other Service SIDs can be processed when an SRH is present and Segments > Left is greater than zero. Ideally, these SIDs should be encoded in the > Destination Options Header that immediately precedes the Routing header. > This is because the Destination Options Header that immediately precedes > the Routing header is processed by every segment endpoint. > Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is > not the only one. > > > > Another possibility is to encode these SIDs the Destination Options heade= r > that immediately precedes the upper-layer header and required Service > Function Instances that support these SIDs to look ahead. > > > > > > > Ron > > > > > > > > Juniper Internal > > *From:* James N Guichard > *Sent:* Thursday, April 18, 2019 5:57 PM > *To:* Ron Bonica ; Robert Raszuk > *Cc:* SPRING WG ; ipv6@ietf.org; Dino Farinacci < > farinacci@gmail.com>; lisp@ietf.org list ; James N > Guichard > *Subject:* RE: [spring] IPv6-compressed-routing-header-crh > > > > Hi Ron, > > > > I am wondering about how do you plan to handle service SIDs (or any SID > with embedded functions) at intermediate nodes; > draft-bonica-6man-vpn-dest-opt seems to only handle the case where the > endpoint will process the destination option: > > > > Section 4 says: =E2=80=9CIt MUST NOT appear in a Hop-by-hop Options heade= r and > SHOULD NOT appear in a Destination Options header that precedes a Routing > header=E2=80=9D. > > > > If you relax the latter and encode the SID in a destination option > preceding the CRH (or SRH) then wouldn=E2=80=99t every node in the segmen= t-list > have to process the SID and figure out whether it is a local SID or not? > That would seem to be overly complex given you could just encode the SID = in > the CRH (or SRH) and only the node where said SID is exposed would proces= s > it. > > > > Thanks! > > > > Jim > > > > *From:* ipv6 [mailto:ipv6-bounces@ietf.org ] *On > Behalf Of *Ron Bonica > *Sent:* Thursday, April 18, 2019 4:30 PM > *To:* Robert Raszuk > *Cc:* SPRING WG ; ipv6@ietf.org; Dino Farinacci < > farinacci@gmail.com>; lisp@ietf.org list > *Subject:* RE: [spring] IPv6-compressed-routing-header-crh > > > > Robert, > > > > The Compressed Routing Header (CRH) has exactly one function. That is to > route a packet for segment to segment along an SR path. Therefore, SIDs > contained by the CRH have only one function. That is to steer packets to > the next segment. > > > > Granted, we may want to program a service behavior at a segment endpoint. > IPv6 includes a Destination Options header that can be used to convey > information segment endpoints and destination options can contain service > SIDs. These service SIDs can be as long or short as they need to be. See > draft-bonica-6man-vpn-dest-opt for an example. > > > > > Ron > > > > > > Juniper Internal > > *From:* Robert Raszuk > *Sent:* Thursday, April 18, 2019 10:30 AM > *To:* Ron Bonica > *Cc:* Gyan Mishra ; Tom Herbert < > tom@herbertland.com>; SPRING WG ; ipv6@ietf.org; Dino > Farinacci ; lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Ron, > > > > I must observe that your analysis is incorrect. > > > > SIDs are not only used for TE or traffic steering purposes but what is > even more interesting for various functions - for example NFV. > > > > So you need as much SIDs as possible imagination of your value add networ= k > functions - which will be different from those functions at the encap dst > which as you indicate in other draft can be carried in destination option= s. > > > > That debate is still I think open. > > > > Thx, > > R. > > > > > > On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: > > Gyan, > > > > Let=E2=80=99s think about how a network operator might choose a SID size= =E2=80=A6. > > > > Assume that an MAN includes 100 routers. These routers are connected to > one another by infrastructure links. Each router has 20 or fewer > infrastructure links. > > > > The network operator might assign one loosely routes SID to each router. > These loosely routed SIDs have network-wide significance (i.e., the canno= t > be reused). > > > > The network operator might also assign one strictly routed SID to each > link. The strictly routed SIDs have node-local significance only. They ca= n > be reused from one node to another. > > > > So, in this case, the network operator only needs 120 SIDs. This fits in > eight bits with plenty of room for growth. > > > > Now consider another network that includes 30,000 routers. Each router is > connected to its peers by 200 infrastructure links or fewer. This networ= k > would need 30,200 SIDs. This would fit in 16 bits. > > > > A **really big** network might require more than 32,000 SIDs. So, we > support a 32-bit SID... > > > > > Ron > > > > > > > > > > Juniper Internal > > *From:* Gyan Mishra > *Sent:* Wednesday, April 17, 2019 10:00 PM > *To:* Ron Bonica > *Cc:* Robert Raszuk ; Tom Herbert ; > SPRING WG ; ipv6@ietf.org; Dino Farinacci < > farinacci@gmail.com>; lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > > > I agree to make the SID align on word boundaries but I am thinking the > software should have hardware independence if at all possible. > > > > I think 32 bit is a reasonable size. > > > > > > Gyan S. Mishra > > IT Network Engineering & Technology Consultant > > Routing & Switching / Service Provider MPLS & IPv6 Expert > > www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT > > > Mobile =E2=80=93 202-734-1000 > > > > Sent from my iPhone > > > On Apr 14, 2019, at 7:54 PM, Ron Bonica < > rbonica=3D40juniper.net@dmarc.ietf.org> wrote: > > Hi Robert, > > > > In order to make the CRH ASIC-friendly, we have the following constraints= : > > > > - Support only a small handful of SID lengths > - If at all possible, make them align on word boundaries > > > > Currently, we support 8, 16 and 32 bytes. Do you see a reason why we > should support a length greater than 32? Is there some length less than 3= 2 > that would be beneficial? > > > > Ron > > > > > > > > Juniper Internal > > *From:* spring *On Behalf Of *Robert Raszuk > *Sent:* Friday, April 12, 2019 6:13 PM > *To:* Tom Herbert > *Cc:* SPRING WG ; ipv6@ietf.org; Mark Smith < > markzzzsmith@gmail.com>; Dino Farinacci ; > lisp@ietf.org list > *Subject:* Re: [spring] IPv6-compressed-routing-header-crh > > > > Hi Tom, > > > > I already suggested this on March 30th ... > > > > *"**PS. But if you choose to go ahead with CRH I would highly advise to > make your CRH SID a variable length. "* > > > > No feedback/response was received from authors. > > > > Thx, > R. > > > > On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote: > > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote= : > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y > and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 > network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and > processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family > support in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control > plane is good for you" now clearly has evolved into not only reduction of > control plane but what can be even more important to some users ability t= o > request specific behavior via programmed functions of network elements on= a > per flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will > call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new > mapping plane to be distributed in control plane and to be inserted into > data plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network > functionality is being taken away from SRH and is being shifted to > Destination Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing > proposal that we have one already it is called BGP. One needs to also > observe that we as industry worked number of years of protocol suite call= ed > LISP allowing not only very good mapping plane, but also data plane > integration. CC-ing lisp authors for their comments. Note also work for > integrating SRv6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is > similar to the size of IPv4 my fundamental question is why not use > something which already exists instead of defining some sort of new from > scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used = a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P > or Vector Routing as an alternative options. I really do not see a room o= r > need for yet one more mapping plane. What problem does it solve which wou= ld > not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional > per SR path state in both control plane and now in data plane are really > something we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce > control plane state and processing. The trade-off for reduced control pla= ne > state and processing is to instead carry and encode most or all of that > information or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then > pushing some of that information and processing back into the control pla= ne > should be ok, as long as there is still a beneficial overall reduction in > control plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perfor= m > SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to leverage IPv4 support in existing > protocols to suite carrying and processing 32 bit SIDs with some, possibl= y > slight, modification. For example, perhaps IPv4 Address Family support in > OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------= - > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf......org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > > -------------------------------------------------------------------= - > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- > > --0000000000000bf5fd0586dd1a12 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable --0000000000003643be05870f99ae-- From nobody Mon Apr 22 07:24:21 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR05MB4116 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-22_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904220159 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2019 21:01:07 -0000 --_000_BN7PR05MB42435B04C0B492B229A96AB3AE220BN7PR05MB4243namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Robert, Thanks for brining out the distinction between topological instructions and= service instructions. At IETF 104, I spoke about this distinction in my pr= esentations to SPRING and 6man. The CRH is for topological instructions only. That is why such short SIDs s= uffice in the CRH. IPv6 offers the Destination Options header for conveying service instructio= ns to downstream nodes. Some service instructions are valid only when one o= f the following is true: * There is no IPv6 Routing header * There is an IPv6 Routing header and Segments Left is equal to zero In this case, the service SID can be encoded in the Destination Options hea= der that immediately precedes the upper-layer header. Its length can be any= where between 0 and 255 bytes. Other service instructions are valid when Segments Left is greater than zer= o. These can be encoded in the Destination Options header that immediately = precedes the IPv6 Routing header. Again, there length can be anywhere betwe= en 0 and 255 bytes. Ron R= on Juniper Internal From: Robert Raszuk Sent: Thursday, April 18, 2019 4:56 PM To: Ron Bonica Cc: Gyan Mishra ; Tom Herbert ;= SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, > The Compressed Routing Header (CRH) has exactly one function. That is to = route a packet for > segment to segment along an SR path. Therefore, SIDs contained by the CRH= have only one > function. That is to steer packets to the next segment. Indeed and that is precisely where the fundamental problem resides with you= r proposal. Let's take a look at RFC8402 - Segment Routing Architecture. In body of the above RFC we clearly see definition of SID to be either a to= pological instruction (your draft meets that requirement) or service instru= ction (your draft fails to meet those requirements) To illustrate along with just a basic example from RFC8402 of service instr= uction - different per hop behavior treatment for traversing packets to be = embedded into SID. So if you are only to associate SID with topological instructions you have = no way to express transit service instructions so it seems pretty obvious t= hat your proposal does not meet basic SR network programming requirements. That means that all you can provide is subset of SR Architecture requiremen= ts so perhaps to avoid industry confusion your solution should avoid use of= SID or SR references. Perhaps as Tom already also observed we should call = it MRH Mapped Routing Header instead. Kind regards, Robert. On Thu, Apr 18, 2019 at 10:29 PM Ron Bonica > wrote: Robert, The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the nex= t segment. Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-bon= ica-6man-vpn-dest-opt for an example. = Ron Juniper Internal From: Robert Raszuk > Sent: Thursday, April 18, 2019 10:30 AM To: Ron Bonica > Cc: Gyan Mishra >; Tom = Herbert >; SPRING WG >; ipv6@ietf.org; D= ino Farinacci >; lisp@ietf.= org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even= more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network = functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica > wrote: Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID. = Ron Juniper Internal From: Gyan Mishra > Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica > Cc: Robert Raszuk >; Tom Herber= t >; SPRING WG >; ipv6@ietf.org; Dino Fa= rinacci >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf....org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BN7PR05MB42435B04C0B492B229A96AB3AE220BN7PR05MB4243namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Ro= bert,

=  

Thank= s for brining out the distinction between topological instructions and serv= ice instructions. At IETF 104, I spoke about this distinction in my present= ations to SPRING and 6man.

=  

The C= RH is for topological instructions only. That is why such short SIDs suffic= e in the CRH.

=  

IPv6 = offers the Destination Options header for conveying service instructions to= downstream nodes. Some service instructions are valid only when one of the= following is true:

=  

  • There is no IPv6 Routing header=
  • There is an IPv6 Routing header and Segmen= ts Left is equal to zero

=  

In th= is case, the service SID can be encoded in the Destination Options header t= hat immediately precedes the upper-layer header. Its length can be anywhere= between 0 and 255 bytes.

=  

Other= service instructions are valid when Segments Left is greater than zero. Th= ese can be encoded in the Destination Options header that immediately prece= des the IPv6 Routing header. Again, there length can be anywhere between 0 and 255 bytes.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;      Ron

=  

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;          Ron

=  

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>=
Sent: Thursday, April 18, 2019 4:56 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@h= erbertland.com>; SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino = Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org= >
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

> The Compressed Routing Header (CRH) has exactly= one function. That is to route a packet for 

> segment to segment along an SR path. Therefore,= SIDs contained by the CRH have only one 

> function. That is to steer packets to the next = segment.

 

Indeed and that is precisely where the fundamental p= roblem resides with your proposal. 

 

Let's take a look at RFC8402 - Segment Routing = Architecture. 

 

In body of the above RFC we clearly see definition o= f SID to be either a topological instruction (your draft meets that require= ment) or service instruction (your draft fails to meet those requirements)&= nbsp;

 

To illustrate along with just a basic example from R= FC8402 of service instruction - different per hop behavior treatment for tr= aversing packets to be embedded into SID. 

 

So if you are only to associate SID with topological= instructions you have no way to express transit service instructions so it= seems pretty obvious that your proposal does not meet basic SR network pro= gramming requirements. 

 

That means that all you can provide is subset of SR = Architecture requirements so perhaps to avoid industry confusion your solut= ion should avoid use of SID or SR references. Perhaps as Tom already also o= bserved we should call it MRH Mapped Routing Header instead. 

 

Kind regards,

Robert.

 

Robert,=

 <= /o:p>

The Compressed Rout= ing Header (CRH) has exactly one function. That is to route a packet for se= gment to segment along an SR path. Therefore, SIDs contained by the CRH have only one function. That is to steer packets= to the next segment.

 <= /o:p>

Granted, we may wan= t to program a service behavior at a segment endpoint. IPv6 includes a Dest= ination Options header that can be used to convey information segment endpoints and destination options can contai= n service SIDs. These service SIDs can be as long or short as they need to = be. See draft-bonica-6man-vpn-dest-opt for an example.

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;             =             &nb= sp;           Ron

 <= /o:p>

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRIN= G WG <spring@ietf.o= rg>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I must observe that your analysis is incorrect. 

 

SIDs are not only used for TE or traffic steering purposes but wha= t is even more interesting for various functions - for example NFV. 

 

So you need as much SIDs as possible imagination of your value add= network functions - which will be different from those functions at the en= cap dst which as you indicate in other draft can be carried in destination options. 

 

That debate is still I think open. 

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net> wrote:

Gyan,

 <= /o:p>

Let’s think a= bout how a network operator might choose a SID size….

 <= /o:p>

Assume that an MAN = includes 100 routers. These routers are connected to one another by infrast= ructure links. Each router has 20 or fewer infrastructure links.

 <= /o:p>

The network operato= r might assign one loosely routes SID to each router. These loosely routed = SIDs have network-wide significance (i.e., the cannot be reused).

 <= /o:p>

The network operato= r might also assign one strictly routed SID to each link. The strictly rout= ed SIDs have node-local significance only. They can be reused from one node to another.

 <= /o:p>

So, in this case, t= he network operator only needs 120 SIDs. This fits in eight bits with plent= y of room for growth.

 <= /o:p>

Now consider anothe= r network that includes 30,000 routers. Each router is connected to its pee= rs by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

 <= /o:p>

A *really big* network might require more than 32,000 SIDs. So, we support a 32-bit SID= .

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Ron

 <= /o:p>

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but I am thinking= the software should have hardware independence if at all possible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS & IPv6 Expert<= o:p>

Mobile – 202-734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

Hi Robert,

 <= /o:p>

In order to make th= e CRH ASIC-friendly, we have the following constraints:

 <= /o:p>

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

 <= /o:p>

Currently, we suppo= rt 8, 16 and 32 bytes. Do you see a reason why we should support a length g= reater than 32? Is there some length less than 32 that would be beneficial?

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to = make your CRH SID a variable length. "

 

No feedba= ck/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:<= o:p>

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com> wro= te:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ....org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

------------------------------------------------------------------= --
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------

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boundary="_000_BN7PR05MB42433AD5A3B5C188228707B0AE220BN7PR05MB4243namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: ffc1dff7-0252-4013-7dc9-08d6c7671ac1 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Apr 2019 21:11:36.2421 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR05MB4385 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-22_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904220160 Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2019 21:11:51 -0000 --_000_BN7PR05MB42433AD5A3B5C188228707B0AE220BN7PR05MB4243namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Robert, There are more than a few solutions to this problem. Draft-bonica-6man-seg-end-opt proposes one solution. Another solution is to define SFI specific Destination Options. For example= , define Option N, that is processed only by NATs and Option F, that is pro= cessed only by Firewalls. The send the packet through a service chain that = includes a NAT and a Firewall. Each device processes the option that it rec= ognizes. (In order to make this work, all option types would have to begin = with 00.) I can think of two or three other solutions, but they probably stray from t= he topic at hand. Ron Juniper Internal From: Robert Raszuk Sent: Friday, April 19, 2019 6:44 AM To: Ron Bonica Cc: James N Guichard ; SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org li= st Subject: Re: [spring] IPv6-compressed-routing-header-crh Specifically how do you associate different service functions encoded in De= st. Options with specific segments for selective execution ? Hint: Execution of all encoded and carried from src or edge of the network = service instructions in destinations options at each SR node is not an opt= ion. Do you now duplicate each SID into Dest Options to be able to choose = which service is executed in which of the entire path's mid point ? Many thx, Robert. On Fri, Apr 19, 2019 at 9:30 AM Robert Raszuk > wrote: And what happens - * When there is an SRH and Segments Left is not equal to 0 ? On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica > wrote: Hi Jim, Thanks for asking this insightful question. The answer depends on the SID t= ype. Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed = only in the following conditions: * When there is no SRH * When there is an SRH and Segments Left is equal to 0 Such SIDs should be encoded in the Destination Options header that immediat= ely precedes the upper-layer header. This is because the Destination Option= s header that immediately precedes the upper-layer header is only processed= when: * When there is no SRH * When there is an SRH and Segments Left is equal to 0 Moreover, Destination options are of variable length. So, each SID can be a= s long or short as it needs to be. One SID type can be long while another i= s short and neither needs to be the same length as SIDs that are encoded in= the IPv6 Routing header. The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an e= xample of such an encoding. It serves the same purpose as many of the SID d= efined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, EN= D.DX6, END.DT4, END.DT6). As more service SIDs of this type are identified,= more destination options will be defined. Other Service SIDs can be processed when an SRH is present and Segments Lef= t is greater than zero. Ideally, these SIDs should be encoded in the Destin= ation Options Header that immediately precedes the Routing header. This is = because the Destination Options Header that immediately precedes the Routin= g header is processed by every segment endpoint. Draft-bonica-6man-seg-end-= opt offers one such encoding scheme, but it is not the only one. Another possibility is to encode these SIDs the Destination Options header = that immediately precedes the upper-layer header and required Service Funct= ion Instances that support these SIDs to look ahead. = Ron Juniper Internal From: James N Guichard > Sent: Thursday, April 18, 2019 5:57 PM To: Ron Bonica >; Robert Ra= szuk > Cc: SPRING WG >; ipv6@ietf.org; Dino Farinacci >; lisp@ietf.org list >; James N Guichard > Subject: RE: [spring] IPv6-compressed-routing-header-crh Hi Ron, I am wondering about how do you plan to handle service SIDs (or any SID wit= h embedded functions) at intermediate nodes; draft-bonica-6man-vpn-dest-opt= seems to only handle the case where the endpoint will process the destinat= ion option: Section 4 says: "It MUST NOT appear in a Hop-by-hop Options header and SHOU= LD NOT appear in a Destination Options header that precedes a Routing heade= r". If you relax the latter and encode the SID in a destination option precedin= g the CRH (or SRH) then wouldn't every node in the segment-list have to pro= cess the SID and figure out whether it is a local SID or not? That would se= em to be overly complex given you could just encode the SID in the CRH (or = SRH) and only the node where said SID is exposed would process it. Thanks! Jim From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica Sent: Thursday, April 18, 2019 4:30 PM To: Robert Raszuk > Cc: SPRING WG >; ipv6@ietf.org; Dino Farinacci >; lisp@ietf.org list > Subject: RE: [spring] IPv6-compressed-routing-header-crh Robert, The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the nex= t segment. Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-bon= ica-6man-vpn-dest-opt for an example. = Ron Juniper Internal From: Robert Raszuk > Sent: Thursday, April 18, 2019 10:30 AM To: Ron Bonica > Cc: Gyan Mishra >; Tom = Herbert >; SPRING WG >; ipv6@ietf.org; D= ino Farinacci >; lisp@ietf.= org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Ron, I must observe that your analysis is incorrect. SIDs are not only used for TE or traffic steering purposes but what is even= more interesting for various functions - for example NFV. So you need as much SIDs as possible imagination of your value add network = functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options. That debate is still I think open. Thx, R. On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica > wrote: Gyan, Let's think about how a network operator might choose a SID size.... Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructur= e links. The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be r= eused from one node to another. So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth. Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. A *really big* network might require more than 32,000 SIDs. So, we support = a 32-bit SID... = Ron Juniper Internal From: Gyan Mishra > Sent: Wednesday, April 17, 2019 10:00 PM To: Ron Bonica > Cc: Robert Raszuk >; Tom Herber= t >; SPRING WG >; ipv6@ietf.org; Dino Fa= rinacci >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh I agree to make the SID align on word boundaries but I am thinking the soft= ware should have hardware independence if at all possible. I think 32 bit is a reasonable size. Gyan S. Mishra IT Network Engineering & Technology Consultant Routing & Switching / Service Provider MPLS & IPv6 Expert www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT Mobile - 202-734-1000 Sent from my iPhone On Apr 14, 2019, at 7:54 PM, Ron Bonica > wrote: Hi Robert, In order to make the CRH ASIC-friendly, we have the following constraints: * Support only a small handful of SID lengths * If at all possible, make them align on word boundaries Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? Ron Juniper Internal From: spring > On B= ehalf Of Robert Raszuk Sent: Friday, April 12, 2019 6:13 PM To: Tom Herbert > Cc: SPRING WG >; ipv6@ietf.org; Mark Smith >; Dino Farinacci = >; lisp@ietf.org list > Subject: Re: [spring] IPv6-compressed-routing-header-crh Hi Tom, I already suggested this on March 30th ... "PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. " No feedback/response was received from authors. Thx, R. On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert > wrote: On Fri, Apr 12, 2019 at 1:48 PM Mark Smith > wrote: > > Hi Tom, > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert > wrote: > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > Hi Mark, > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary = and a 32 bit alignment, > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 ne= twork. > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to > > > > leverage IPv4 support in existing protocols to suite carrying and p= rocessing 32 bit SIDs with some, possibly > > > > slight, modification. For example, perhaps IPv4 Address Family supp= ort in OSPFv3 (RFC 5838) could be > > > > somehow leveraged to suit SR. > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > I think SR while indeed started with the story of "less control plane= is good for you" now clearly has evolved into not only reduction of contro= l plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per f= low basis without actually per flow or per path signalling or state. > > > > > > Yes for some it may be very useful feature and I am sure some will ca= ll it overload of data plane or . There is no one size fits all. > > > > > > With that let's observe that till today SR did not require any new ma= pping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. > > > > > > Furthermore as we see in companion documents all additional network f= unctionality is being taken away from SRH and is being shifted to Destinati= on Options . > > > > > > As far as mapping plane I already pointed out in my Vector Routing pr= oposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP a= llowing not only very good mapping plane, but also data plane integration. = CC-ing lisp authors for their comments. Note also work for integrating SRv6= with LISP which is already is published. > > > > > > Since you correctly observed that now SID can be 32 bit and that is s= imilar to the size of IPv4 my fundamental question is why not use something= which already exists instead of defining some sort of new from scratch ? > > > > > Robert, > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > please provide a reference? > > > > To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.) > > Ron and others have written this draft, which supports SIDS of various > sizes - 8, 16 or 32 bits - that triggered this discussion. > Mark, Why not just put a SID length field in the header (like RFC6554 but more generic). That would allow lengths of 1-16 bytes. Additional flags could be used to indicate the semantics of the entries. For instance, they might be actual addresses (128 bits for IPv6, 32 bits for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) where the rest of the address can be inferred, indices into a table, labels, etc. Tom > "The IPv6 Compressed Routing Header (CRH)" > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > Regards, > Mark. > > > > As for trying to use something that already exists, why does SR used a > > fixed size format for SIDs instead of a variable length format like > > that described in RFC6554? Similarly, why does SR define it's own TLV > > format instead of using Hop-by-Hop and Destination Options defined in > > RFC8200? > > > > Tom > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP = or Vector Routing as an alternative options. I really do not see a room or = need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? > > > > > > Kind regards, > > > Robert > > > > > > > > >>> 2) Is there an agreement that solutions which require additional pe= r SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? > > >> > > >> > > >> I think so. > > >> > > >> My understanding of what SR is fundamentally about is to reduce cont= rol plane state and processing. The trade-off for reduced control plane sta= te and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. > > >> > > >> If the per-packet overhead becomes too large and expensive, then pus= hing some of that information and processing back into the control plane sh= ould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. > > >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary a= nd a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. > > >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may al= so create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, m= odification. For example, perhaps IPv4 Address Family support in OSPFv3 (RF= C 5838) could be somehow leveraged to suit SR. > > >> > > >> Regards, > > >> Mark. > > > > > > -------------------------------------------------------------------- > > > IETF IPv6 working group mailing list > > > ipv6@ietf......org > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- --_000_BN7PR05MB42433AD5A3B5C188228707B0AE220BN7PR05MB4243namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Rober= t,

=  

There= are more than a few solutions to this problem.

=  

Draft= -bonica-6man-seg-end-opt proposes one solution.

=  

Anoth= er solution is to define SFI specific Destination Options. For example, def= ine Option N, that is processed only by NATs and Option F, that is processe= d only by Firewalls. The send the packet through a service chain that includes a NAT and a Firewall. Each device pr= ocesses the option that it recognizes. (In order to make this work, all opt= ion types would have to begin with 00.)

=  

I can= think of two or three other solutions, but they probably stray from the to= pic at hand.

=  

 = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;  Ron

=  

=  

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>=
Sent: Friday, April 19, 2019 6:44 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: James N Guichard <james.n.guichard@huawei.com>; SPRING WG = <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.= com>; lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

Specifically how do you associate different service = functions encoded in Dest. Options with specific segments for selective exe= cution ? 

 

Hint: Execution of all encoded and carried from src = or edge of the network service instructions in destinations options  a= t each SR node is not an option. Do you now duplicate each SID into Dest Op= tions  to be able to choose which service is executed in which of the entire path's mid point ? 

 

Many thx,

Robert.

 

On Fri, Apr 19, 2019 at 9:30 AM Robert Raszuk <robert@raszuk.net> wrote:

 

And what happens - 

 

  • When there is an SRH and Segments Left is = not equal to 0 ? 

 

 

On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica <rbonica@juniper.net= > wrote:

Hi Jim,=

 <= /o:p>

Thanks for asking t= his insightful question. The answer depends on the SID type.

 <= /o:p>

Some service SIDs (= e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed only in the followi= ng conditions:

 <= /o:p>

  • When there is no SRH
  • When there is an SRH and Segments Left is = equal to 0

 <= /o:p>

Such SIDs should be= encoded in the Destination Options header that immediately precedes the up= per-layer header. This is because the Destination Options header that immediately precedes the upper-layer heade= r is only processed when:

 <= /o:p>

  • When there is no SRH
  • When there is an SRH and Segments Left is = equal to 0

 <= /o:p>

Moreover, Destinati= on options are of variable length. So, each SID can be as long or short as = it needs to be. One SID type can be long while another is short and neither needs to be the same length as SIDs tha= t are encoded in the IPv6 Routing header.

 <= /o:p>

The VPN Context Inf= ormation Option [draft-bonica-6man-vpn-dest-opt] is an example of such an e= ncoding. It serves the same purpose as many of the SID defined in draft-filsfils-spring-srv6-network-programming = (e.g., END.DX4, END.DX6, END.DT4, END.DT6). As more service SIDs of this ty= pe are identified, more destination options will be defined.

 <= /o:p>

Other Service SIDs = can be processed when an SRH is present and Segments Left is greater than z= ero. Ideally, these SIDs should be encoded in the Destination Options Header that immediately precedes the Routing he= ader. This is because the Destination Options Header that immediately prece= des the Routing header is processed by every segment endpoint. Draft-bonica= -6man-seg-end-opt offers one such encoding scheme, but it is not the only one.

 <= /o:p>

Another possibility= is to encode these SIDs the Destination Options header that immediately pr= ecedes the upper-layer header and required Service Function Instances that support these SIDs to look ahead.

 <= /o:p>

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p; Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: James N Guichard <james.n.guichard@huawei.com>
Sent: Thursday, April 18, 2019 5:57 PM
To: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>= ; James N Guichard <james.n.guichard@huawei.com>
Subject: RE: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I am wondering about how do you plan= to handle service SIDs (or any SID with embedded functions) at intermediat= e nodes; draft-bonica-6man-vpn-dest-opt seems to only handle the case where the endpoint will process the destinat= ion option:

 

Section 4 says: “It MUST NO= T appear in a Hop-by-hop Options header and SHOULD NOT appear in a Destinat= ion Options header that precedes a Routing header”.=

 

If you relax the latter = and encode the SID in a destination option preceding the CRH (or SRH) then = wouldn’t every node in the segment-list have to process the SID and figure out whether it is a local SID or not? T= hat would seem to be overly complex given you could just encode the SID in = the CRH (or SRH) and only the node where said SID is exposed would process = it.

 =

Thanks!

 =

Jim

 

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: RE: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Robert,=

 <= /o:p>

The Compressed Rout= ing Header (CRH) has exactly one function. That is to route a packet for se= gment to segment along an SR path. Therefore, SIDs contained by the CRH have only one function. That is to steer packets= to the next segment.

 <= /o:p>

Granted, we may wan= t to program a service behavior at a segment endpoint. IPv6 includes a Dest= ination Options header that can be used to convey information segment endpoints and destination options can contai= n service SIDs. These service SIDs can be as long or short as they need to = be. See draft-bonica-6man-vpn-dest-opt for an example.

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;             =             &nb= sp;           Ron

 <= /o:p>

 

Juniper Internal=

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRIN= G WG <spring@ietf.o= rg>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Ron,

 

I must observe that your analysis is incorrect. 

 

SIDs are not only used for TE or traffic steering purposes but wha= t is even more interesting for various functions - for example NFV. 

 

So you need as much SIDs as possible imagination of your value add= network functions - which will be different from those functions at the en= cap dst which as you indicate in other draft can be carried in destination options. 

 

That debate is still I think open. 

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net> wrote:

Gyan,

 <= /o:p>

Let’s think a= bout how a network operator might choose a SID size….

 <= /o:p>

Assume that an MAN = includes 100 routers. These routers are connected to one another by infrast= ructure links. Each router has 20 or fewer infrastructure links.

 <= /o:p>

The network operato= r might assign one loosely routes SID to each router. These loosely routed = SIDs have network-wide significance (i.e., the cannot be reused).

 <= /o:p>

The network operato= r might also assign one strictly routed SID to each link. The strictly rout= ed SIDs have node-local significance only. They can be reused from one node to another.

 <= /o:p>

So, in this case, t= he network operator only needs 120 SIDs. This fits in eight bits with plent= y of room for growth.

 <= /o:p>

Now consider anothe= r network that includes 30,000 routers. Each router is connected to its pee= rs by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

 <= /o:p>

A *really big* network might require more than 32,000 SIDs. So, we support a 32-bit SID= ...

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Ron

 <= /o:p>

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

 

I agree to make the SID align on word boundaries but I am thinking= the software should have hardware independence if at all possible.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS & IPv6 Expert<= o:p>

Mobile – 202-734-1000

 

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

Hi Robert,

 <= /o:p>

In order to make th= e CRH ASIC-friendly, we have the following constraints:

 <= /o:p>

  • Support only a small handful of SID length= s
  • If at all possible, make them align on wor= d boundaries

 <= /o:p>

Currently, we suppo= rt 8, 16 and 32 bytes. Do you see a reason why we should support a length g= reater than 32? Is there some length less than 32 that would be beneficial?

 <= /o:p>

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            Ron

 <= /o:p>

 <= /o:p>

 

Juniper Internal=

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh<= /p>

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to = make your CRH SID a variable length. "

 

No feedba= ck/response was received from authors. 

 

Thx,
R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:<= o:p>

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com> wro= te:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR i= n an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not require a= ny new mapping plane to be distributed in control plane and to be inserted = into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new  f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can y= ou
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size > for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's own= TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate = to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ......org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

------------------------------------------------------------------= --
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------

--_000_BN7PR05MB42433AD5A3B5C188228707B0AE220BN7PR05MB4243namp_-- From nobody Tue Apr 23 00:48:51 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2620B120091; Tue, 23 Apr 2019 00:48:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IUiNui2H-Cmm; Tue, 23 Apr 2019 00:48:46 -0700 (PDT) Received: from orange.com (mta134.mail.business.static.orange.com [80.12.70.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C95931200B3; Tue, 23 Apr 2019 00:48:45 -0700 (PDT) Received: from opfednr06.francetelecom.fr (unknown [xx.xx.xx.70]) by opfednr22.francetelecom.fr (ESMTP service) with ESMTP id 44pFtz4y4Mz105B; Tue, 23 Apr 2019 09:48:43 +0200 (CEST) Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.26]) by opfednr06.francetelecom.fr (ESMTP service) with ESMTP id 44pFtz40GvzDq7Q; Tue, 23 Apr 2019 09:48:43 +0200 (CEST) Received: from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBM31.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0439.000; Tue, 23 Apr 2019 09:48:43 +0200 From: To: SPRING WG CC: "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AdTZy1D2mUjAURp0TKqNc4AXeLzDEgf20yRQ Date: Tue, 23 Apr 2019 07:48:42 +0000 Message-ID: <12541_1556005723_5CBEC35B_12541_328_1_53C29892C857584299CBF5D05346208A48A8E315@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48A8E315OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2019 07:48:50 -0000 --_000_53C29892C857584299CBF5D05346208A48A8E315OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi authors, SPRING WG, This document has 6 authors and 22 contributors. As expected the call for I= PR has been long and difficult. Please find below the current status. We got an answer from all authors and= 19 out of 22 contributors. Unless there is a motivated objection, we'll make an exception from the 3 m= issing contributors who are not reachable. Note that this does not change t= heir obligation to accept all IETF rules of process https://www6.ietf.org/a= bout/note-well.html Robert Raszuk Y 21/03/2019 Contributor Daniel Bernier Y 21/03/2019 Author John Leddy Y 13/03/2019 Author Satoru Matsushima Y 15/03/2019 Author Daniel Voyer y 21/03/2019 Contributor Dirk Steinberg Y 10/04/2019 Contributor Bruno Decraene Y 03/04/2019 Contributor Bart Peirens Y 25/03/2019 Contributor David Lebrun Y 29/03/2019 Contributor Stefano Salsano Y 04/04/2019 Contributor Gaurav Naik Y 04/04/2019 Contributor Ahmed Bashandy Y 19/03/2019 Contributor Linzhenbin (H) Y 14/03/2019 Author Arthi Ayyangar Y 10/04/2019 Contributor Satish Mynam Contributor Wim Henderickx Y 18/04/2019 Contributor Shaowen Ma Contributor Prem Jonnalagadda Contributor Milad Sharif Y 10/04/2019 Contributor Hani Elmalky Y 10/04/2019 Contributor Zafar Ali Y 13/03/2019 Contributor Ahmed Abdelsalam Y 15/03/2019 Contributor Francois Clad Y 15/03/2019 Contributor Kamran Raza Y 27/03/2019 Contributor Darren Dukes Y 18/03/2019 Contributor Patrice Brissete Y 15/03/2019 Contributor Clarence Y 14/03/2019 Author Pablo Y 15/03/2019 Author Regards, --Rob, Bruno From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Wednesday, March 13, 2019 7:50 PM To: SPRING WG Cc: draft-filsfils-spring-srv6-network-programming@ietf.org Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programmi= ng Hi authors, SPRING WG, In parallel to the call for adoption for draft-filsfils-spring-srv6-network= -programming (1), we would like to poll for IPR. If you are aware of IPR that applies to draft-filsfils-spring-srv6-network-= programming please respond to this email. If you are aware of IPR, please indicate whether it has been disclosed in a= ccordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more = details). If you are an *author or contributor* please respond to this email regardle= ss of whether or not you're aware of any IPR. If you are not an author or contributor, please explicitly respond only if = you are aware of IPR that has not yet been disclosed. This document will not advance into the working group until IPR confirmatio= ns have been received from all authors and contributors. Thank you, (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-program= ming-07 --Bruno & Rob. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48A8E315OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi authors, SPRING WG,

 

This document has 6 authors and 22 contributors. As expected the call for IPR has been long and difficult.

Please find below the current status. We got an answer from all authors and 19 out of 22 contributors.

Unless there is a motivated objection, we’ll make an exception from the 3 missing contributors who are not reachable. N= ote that this does not change their obligation to accept all IETF rules of = process https://www6.ietf.or= g/about/note-well.html

 

Robert Raszuk

Y

21/03/201= 9

Contributor

Daniel Bernier

Y

21/03/201= 9

Author

John Leddy

Y

13/03/201= 9

Author

Satoru Matsushima

Y

15/03/201= 9

Author

Daniel Voyer

y

21/03/201= 9

Contributor

Dirk Steinberg

Y

10/04/201= 9

Contributor

Bruno Decraene

Y

03/04/201= 9

Contributor

Bart Peirens

Y

25/03/201= 9

Contributor

David Lebrun

Y

29/03/201= 9

Contributor

Stefano Salsano

Y

04/04/201= 9

Contributor

Gaurav Naik

Y

04/04/201= 9

Contributor

Ahmed Bashandy

Y

19/03/201= 9

Contributor

Linzhenbin (H)

Y

14/03/201= 9

Author

Arthi Ayyangar

Y

10/04/201= 9

Contributor

Satish Mynam

 

Contributor

Wim Henderickx

Y

18/04/201= 9

Contributor

Shaowen Ma

 

Contributor

Prem Jonnalagadda

 

Contributor

Milad Sharif

Y

10/04/201= 9

Contributor

Hani Elmalky

Y

10/04/201= 9

Contributor

Zafar Ali

Y

13/03/201= 9

Contributor

Ahmed Abdelsalam

Y

15/03/201= 9

Contributor

Francois Clad

Y

15/03/201= 9

Contributor

Kamran Raza

Y

27/03/201= 9

Contributor

Darren Dukes

Y

18/03/201= 9

Contributor

Patrice Brissete

Y

15/03/201= 9

Contributor

Clarence

Y

14/03/201= 9

Author

Pablo

Y

15/03/201= 9

Author

 

 

 

Regards,

--Rob, Bruno

 

= From: spring [mailto:spring-bounces@ietf.org] On= Behalf Of bruno.decraene@orange.com
Sent: Wednesday, March 13, 2019 7:50 PM
To: SPRING WG
Cc: draft-filsfils-spring-srv6-network-programming@ietf.org
Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-pr= ogramming

 

Hi authors, SPRING WG,
 
In parallel to the call for adoption for draft-filsfils-sprin=
g-srv6-network-programming (1), we would like to poll for IPR.
 
If you are aware of IPR that applies to draft-filsfils-spring=
-srv6-network-programming please respond to this email.

If you are aware of IPR, please indicate whether it has been =
disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378=
 provide more details).


 


If you are an *author or contributor* please respond to this =
email regardless of whether or not you're aware of any IPR.


If you are not an author or contributor, please explicitly re=
spond only if you are aware of IPR that has not yet been disclosed.


 


This document will not advance into the working group until I=
PR confirmations have been received from all authors and contributors.=



 


Thank you,


 


(1)  <=
/span>https://tools.ietf.org/html/draft-filsfils-spring-=
srv6-network-programming-07


 


 


--Bruno & Rob.


=
 


_________________________________________=
___________________________________________________________________________=
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Orange decline toute responsabilite si ce=
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This message and its attachments may cont=
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______________________________________________________________________=
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Ce message et ses pieces jointes peuvent contenir des informations confiden=
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Tue, 23 Apr 2019 06:46:42 -0700 (PDT) MIME-Version: 1.0 References: <32033_1552503001_5C8950D8_32033_150_1_53C29892C857584299CBF5D05346208A48A187A7@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <12541_1556005723_5CBEC35B_12541_328_1_53C29892C857584299CBF5D05346208A48A8E315@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <12541_1556005723_5CBEC35B_12541_328_1_53C29892C857584299CBF5D05346208A48A8E315@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: ShaoWen Ma Date: Tue, 23 Apr 2019 21:46:30 +0800 Message-ID: To: bruno.decraene@orange.com Cc: SPRING WG , "draft-filsfils-spring-srv6-network-programming@ietf.org" Content-Type: multipart/alternative; boundary="000000000000a80cdd058732d0ff" Archived-At: Subject: Re: [spring] IPR Poll for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2019 13:46:49 -0000 --000000000000a80cdd058732d0ff Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi All, Support as contributor, I am not aware of any IPR about the draft Best Regards Shaowen Ma On Tue, Apr 23, 2019 at 3:49 PM wrote: > Hi authors, SPRING WG, > > > > This document has 6 authors and 22 contributors. As expected the call for > IPR has been long and difficult. > > Please find below the current status. We got an answer from all authors > and 19 out of 22 contributors. > > Unless there is a motivated objection, we=E2=80=99ll make an exception fr= om the 3 > missing contributors who are not reachable. Note that this does not chang= e > their obligation to accept all IETF rules of process > https://www6.ietf.org/about/note-well.html > > > > Robert Raszuk > > Y > > 21/03/2019 > > Contributor > > Daniel Bernier > > Y > > 21/03/2019 > > Author > > John Leddy > > Y > > 13/03/2019 > > Author > > Satoru Matsushima > > Y > > 15/03/2019 > > Author > > Daniel Voyer > > y > > 21/03/2019 > > Contributor > > Dirk Steinberg > > Y > > 10/04/2019 > > Contributor > > Bruno Decraene > > Y > > 03/04/2019 > > Contributor > > Bart Peirens > > Y > > 25/03/2019 > > Contributor > > David Lebrun > > Y > > 29/03/2019 > > Contributor > > Stefano Salsano > > Y > > 04/04/2019 > > Contributor > > Gaurav Naik > > Y > > 04/04/2019 > > Contributor > > Ahmed Bashandy > > Y > > 19/03/2019 > > Contributor > > Linzhenbin (H) > > Y > > 14/03/2019 > > Author > > Arthi Ayyangar > > Y > > 10/04/2019 > > Contributor > > Satish Mynam > > > > Contributor > > Wim Henderickx > > Y > > 18/04/2019 > > Contributor > > Shaowen Ma > > > > Contributor > > Prem Jonnalagadda > > > > Contributor > > Milad Sharif > > Y > > 10/04/2019 > > Contributor > > Hani Elmalky > > Y > > 10/04/2019 > > Contributor > > Zafar Ali > > Y > > 13/03/2019 > > Contributor > > Ahmed Abdelsalam > > Y > > 15/03/2019 > > Contributor > > Francois Clad > > Y > > 15/03/2019 > > Contributor > > Kamran Raza > > Y > > 27/03/2019 > > Contributor > > Darren Dukes > > Y > > 18/03/2019 > > Contributor > > Patrice Brissete > > Y > > 15/03/2019 > > Contributor > > Clarence > > Y > > 14/03/2019 > > Author > > Pablo > > Y > > 15/03/2019 > > Author > > > > > > > > Regards, > > --Rob, Bruno > > > > *From**:* spring [mailto:spring-bounces@ietf.org] *On Behalf Of * > bruno.decraene@orange.com > *Sent:* Wednesday, March 13, 2019 7:50 PM > *To:* SPRING WG > *Cc:* draft-filsfils-spring-srv6-network-programming@ietf.org > *Subject:* [spring] IPR Poll for > draft-filsfils-spring-srv6-network-programming > > > > Hi authors, SPRING WG, > > > > In parallel to the call for adoption for draft-filsfils-spring-srv6-netwo= rk-programming (1), we would like to poll for IPR. > > > > If you are aware of IPR that applies to draft-filsfils-spring-srv6-networ= k-programming please respond to this email. > > If you are aware of IPR, please indicate whether it has been disclosed in= accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378 provide mor= e details). > > > > If you are an *author or contributor* please respond to this email regard= less of whether or not you're aware of any IPR. > > If you are not an author or contributor, please explicitly respond only i= f you are aware of IPR that has not yet been disclosed. > > > > This document will not advance into the working group until IPR confirmat= ions have been received from all authors and contributors. > > > > Thank you, > > > > (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-progr= amming-07 > > > > > > --Bruno & Rob. > > > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu 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 i= nformation 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 de= lete 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. > > _________________________________________________________________________= ________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu 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 i= nformation 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 de= lete 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. > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > --000000000000a80cdd058732d0ff Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
H= i All,
=C2=A0 Support as contributor, I am not aware of any IPR about the draft
Best Re= gards
= Shaowen Ma

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(Postfix) with ESMTPS id 69CBF120058 for ; Tue, 23 Apr 2019 09:15:14 -0700 (PDT) Received: from opfedar07.francetelecom.fr (unknown [xx.xx.xx.9]) by opfedar21.francetelecom.fr (ESMTP service) with ESMTP id 44pT7N3p6jz7v0C for ; Tue, 23 Apr 2019 18:15:12 +0200 (CEST) Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.48]) by opfedar07.francetelecom.fr (ESMTP service) with ESMTP id 44pT7N2lShz5vMq for ; Tue, 23 Apr 2019 18:15:12 +0200 (CEST) Received: from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBM32.corporate.adroot.infra.ftgroup ([fe80::81c9:5f:b9c5:1241%21]) with mapi id 14.03.0439.000; Tue, 23 Apr 2019 18:15:12 +0200 From: To: SPRING WG Thread-Topic: IPR Poll for draft-filsfils-spring-srv6-network-programming Thread-Index: AQHU+eMIA3L2b+rSvkqTNWM0IbbgNaZJ65Zg Date: Tue, 23 Apr 2019 16:15:11 +0000 Message-ID: <9099_1556036112_5CBF3A10_9099_2_1_53C29892C857584299CBF5D05346208A48A8F1F1@OPEXCAUBM43.corporate.adroot.infra.ftgroup> 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from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBM6C.corporate.adroot.infra.ftgroup ([fe80::f58e:8e9d:ae18:b9e3%21]) with mapi id 14.03.0439.000; Wed, 24 Apr 2019 14:12:42 +0200 From: To: SPRING WG , "draft-filsfils-spring-srv6-network-programming@ietf.org" Thread-Topic: Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming Thread-Index: AdTZy78VsE+8X4JtQm2GPnG5Q8GtmQf6dNOw Date: Wed, 24 Apr 2019 12:12:41 +0000 Message-ID: <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48A90703OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2019 12:12:47 -0000 --_000_53C29892C857584299CBF5D05346208A48A90703OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi authors, WG, This document has been accepted as a new WG document. Authors, please: - update email address of authors - republish current/same draft (reviewed and accepted by the WG) a= s draft-ietf-spring-srv6-network-programming-00 - publish -01 to reflect comments and agreement made on the mailin= g list - reply to unanswered WG comments and engage resolution on open po= ints raised so far, in particular during WG adoption call. E.g. (1), (2) As an additional point, this document is not intended to update RFC 8200. I= f a behavior needs to update RFC 8200, it should be defined in a 6MAN draft= in the 6MAN WG and normatively referenced. Thank you, --Bruno, Rob (1) https://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqLmeGn= VNlY (2) https://mailarchive.ietf.org/arch/msg/spring/G_1ZqvInpZ9N2TX7TK8zOLa= -e9I From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Wednesday, March 13, 2019 7:50 PM To: SPRING WG Cc: draft-filsfils-spring-srv6-network-programming@ietf.org Subject: [spring] Working Group Adoption Call for draft-filsfils-spring-srv= 6-network-programming Hi SPRING WG, This email initiates a three week call for working group adoption for draft= -filsfils-spring-srv6-network-programming. (Three weeks to account for the = IETF week) Please indicate your support, comments, or objection, for adopting this dra= ft as a working group item by April, 3rd, 2019 (aka 2019-04-03) We are particularly interested in hearing from working group members that a= re not co-authors of this draft. We are also looking for volunteers who would be ready to perform a technica= l review of this work at some later stage, such as before or during WG the = last call. In parallel to this adoption call, I will send an IPR call for this documen= t. We will need all authors and contributors to confirm their IPR position = on this document. There is currently 1 IPR filled (2) (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-program= ming-07 (2) https://datatracker.ietf.org/ipr/search/?id=3Ddraft-filsfils-spring-sr= v6-network-programming&submit=3Ddraft Thank you, --Bruno & Rob. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48A90703OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi authors, WG,

 

This document has been accepted as a new WG document.

 

Authors, please:

-   =        update email address of authors

-   =        republish current/same draft (reviewed and accepted by the WG) as draft-ietf-spring-srv6-network-programming-00

-   =        publish -01 to reflect comments and agreement made on the mailing list

-   =        reply to unanswered WG comments and engage resolution on open points raised so far, in particular during W= G adoption call. E.g. (1), (2)

 

As an additional point, this document is not intended to update RFC 8200. If a behavior needs to update RFC 8200, i= t should be defined in a 6MAN draft in the 6MAN WG and normatively referenc= ed.

 

Thank you,

--Bruno, Rob

 

(1)    https://mailarchive.ietf.org/arch/msg/spring/ulYV= HKfb6h4fOtM8kqLmeGnVNlY

(2)    https://mailarchive.ietf.org/arch/msg/spring/G_1Z= qvInpZ9N2TX7TK8zOLa-e9I

 

 

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene= @orange.com
Sent: Wednesday, March 13, 2019 7:50 PM
To: SPRING WG
Cc: draft-filsfils-spring-srv6-network-programming@ietf.org
Subject: [spring] Working Group Adoption Call for draft-filsfils-spr= ing-srv6-network-programming

 

Hi SPRING WG,
 
This email initiates a three week call for working group adop=
tion for draft-filsfils-spring-srv6-network-programming. (Three weeks to ac=
count for the IETF week)
 
Please indicate your support, comments, or objection, for ado=
pting this draft as a working group item by April, 3rd, 2019 (ak=
a 2019-04-03)
We are particularly interested in hearing from working group =
members that are not co-authors of this draft.
 
We are also looking for volunteers who would be ready to perf=
orm a technical review of this work at some later stage, such as before or =
during WG the last call.
 
In parallel to this adoption call, I will send an IPR call fo=
r this document. We will need all authors and contributors to confirm their=
 IPR position on this document.
There is currently 1 IPR filled (2)
 
(1)  <=
/span>https://tools.ietf.org/html/draft-filsfils-spring-=
srv6-network-programming-07
(2)  <=
/span>https://datatrac=
ker.ietf.org/ipr/search/?id=3Ddraft-filsfils-spring-srv6-network-programmin=
g&submit=3Ddraft
 
 
Thank you,
--Bruno & Rob.

 

_________________________________________=
___________________________________________________________________________=
_____
 
Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c
pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler
a l'expediteur et le detruire ainsi que l=
es pieces jointes. Les messages electroniques etant susceptibles d'alterati=
on,
Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou 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 s=
ender and delete this message and its attachments.
As emails may be altered, Orange is not liable for messages t=
hat have been modified, changed or falsified.
Thank you.
______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
--_000_53C29892C857584299CBF5D05346208A48A90703OPEXCAUBM43corp_-- From nobody Wed Apr 24 10:47:03 2019 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9A7D9120117; Wed, 24 Apr 2019 10:47:01 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.95.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <155612802139.31977.7567103753020795483@ietfa.amsl.com> Date: Wed, 24 Apr 2019 10:47:01 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2019 17:47:02 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-00.txt Pages : 42 Date : 2019-04-24 Abstract: This document describes the SRv6 network programming concept and its most basic functions. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-00 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 Sat Apr 27 02:41:22 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EBD27120159; Sat, 27 Apr 2019 02:41:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CNiWkWQCcbB5; Sat, 27 Apr 2019 02:41:17 -0700 (PDT) Received: from mta7.iomartmail.com (mta7.iomartmail.com [62.128.193.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B4D191200BA; Sat, 27 Apr 2019 02:41:16 -0700 (PDT) Received: from vs3.iomartmail.com (vs3.iomartmail.com [10.12.10.124]) by mta7.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3R9fDGT020365; Sat, 27 Apr 2019 10:41:13 +0100 Received: from vs3.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A89312203A; Sat, 27 Apr 2019 10:41:13 +0100 (BST) Received: from asmtp2.iomartmail.com (unknown [10.12.10.249]) by vs3.iomartmail.com (Postfix) with ESMTPS id 9371222032; Sat, 27 Apr 2019 10:41:13 +0100 (BST) Received: from LAPTOPK7AS653V ([87.112.228.68]) (authenticated bits=0) by asmtp2.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3R9fCNj005994 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 27 Apr 2019 10:41:12 +0100 Reply-To: From: "Adrian Farrel" To: Cc: "'SPRING WG'" References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Date: Sat, 27 Apr 2019 10:41:11 +0100 Organization: Old Dog Consulting Message-ID: <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01D4FCE5.BBAE2710" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQKiuZZ85wkSAmxndBno69hsKyy+2gKnS9wopJ8JXNA= Content-Language: en-gb X-Originating-IP: 87.112.228.68 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-24576.006 X-TM-AS-Result: No--28.293-10.0-31-10 X-imss-scan-details: No--28.293-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-24576.006 X-TMASE-Result: 10--28.292900-10.000000 X-TMASE-MatchedRID: hFbMlnd2lLM0QDP3j4T8ud1bJb6nwrziqb4ybQC/JXNxb5XAeatg5SfO 9H6Y/dy+nCVoYY7P13fZgnfo9CmRvME7s5KsT+rEIly/lfs5uYkX2N9OpwN26BkqnRJng/51cYA whYZzE3JzeiGpIG8Lu3UkRCQ8MgVkF6dov8Gg2zqs7uBvvd6AmeG5dRZCgxC3QPCWRE0Lo8KnM8 DdMpVuWAQOWnC5UoknESiADfxsklqqEjHR8FX3BS3F56OiNwp/cFEiuPxHjsWHxi2fvkKUMzvqu qZAZLBP8xf51HO7e/VHJiBm6vuqwGDffSFuaHCPjtW9kIs2cScbdAOq4F9Ppfi4nVERfgwd1Dt8 cj80N6pVnzFC+rO0hDCp0hlm7aH0BYr7eWDj5/gJtRX4OIsUwxMMmcrjEONd9pLnYtQ99xKY5NB G7YIbV7gWIsYe+dMeyECTg3cyHcw2BAuBnH8BCVU2//bZZ0l/8CORMyRE01RbdOqDH81KSs1BXO F9hjmyv9+RvGSUdYCPoYeN4F/i1jQZpk7TGz+5JA4J40ZZJQ1PuMJi/ZAk8R0ApwXC/ajU1vBfe qOKfrWk8SEByFMv3LfTtsd9bAafeJAPG0hFhw7OvX5+gBYCs0HrI6vFzzG7anWc0ooSCzKcViC2 UW35PQcvJqD9Z9rhn/pku5zhdLoejpvlEPdhH/OGMtQXx8lo5JutjzhyYOxi34gEjR0gvFVqIv0 mjuMGM+fjINbnJ/ctdaN3IEjAnzMaBezHPBw+Sg2ZSwUn/Kv9KXlxhBAZb5hwKdlCfPk8Vxt8iP ZNr2wlnjh4pS9Fhz+ZqQbT6/3uAWTrDhhyqaEYB2fOueQzjxRFJJyf5BJetOt1ofVlaoKm8jxRk 5/juDsrIxPW/QrJM1oeHf29QosrN8z0HohG3v558CedkGIvpKzNIRhlecPuYwQAu0AYbVQOB0u/ +Wu4TXE974QOzUzUbkg7Hn6m8X7cGd19dSFd X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 09:41:21 -0000 This is a multipart message in MIME format. ------=_NextPart_000_003D_01D4FCE5.BBAE2710 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi chairs, I hate to sound like a broken record. I just want to get this issue clarified before we get to a late stage and risk being forced to start again. RFC 8200 defers to RFC 4291 for the definition of an IPv6 address. RFC 4291 has a somewhat simplistic and possibly historic definition of an IPv6 address. IPv6 addresses are 128-bit identifiers for interfaces and sets of interfaces (where "interface" is as defined in Section 2 of [IPV6]). .where the reference was to RFC 2460 which (of course) is obsoleted by RFC 8200. RFC 8200 has. interface a node's attachment to a link. address an IPv6-layer identifier for an interface or a set of interfaces. Now, during the adoption poll, I suggested that the chairs might like to ping 6man to check that the proposed work in this draft is an acceptable modification to this definition. The challenge, as far as I see it, is purely semantic. That is, we propose to place in the DA field of an IPv6 header a value which is routable but which does not identify an interface. I am not clear whether this represents an Update to RFC 8200 or to RFC 4291, but I do strongly recommend that the chairs check with 6man that this approach is not going to be rejected during IETF last call. Thanks, Adrian From: spring On Behalf Of bruno.decraene@orange.com Sent: 24 April 2019 13:13 To: SPRING WG ; draft-filsfils-spring-srv6-network-programming@ietf.org Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming Hi authors, WG, This document has been accepted as a new WG document. Authors, please: * update email address of authors * republish current/same draft (reviewed and accepted by the WG) as draft-ietf-spring-srv6-network-programming-00 * publish -01 to reflect comments and agreement made on the mailing list * reply to unanswered WG comments and engage resolution on open points raised so far, in particular during WG adoption call. E.g. (1), (2) As an additional point, this document is not intended to update RFC 8200. If a behavior needs to update RFC 8200, it should be defined in a 6MAN draft in the 6MAN WG and normatively referenced. Thank you, --Bruno, Rob 1. https://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqLmeGnVNlY 2. https://mailarchive.ietf.org/arch/msg/spring/G_1ZqvInpZ9N2TX7TK8zOLa-e9I From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@orange.com Sent: Wednesday, March 13, 2019 7:50 PM To: SPRING WG Cc: draft-filsfils-spring-srv6-network-programming@ietf.org Subject: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming Hi SPRING WG, This email initiates a three week call for working group adoption for draft-filsfils-spring-srv6-network-programming. (Three weeks to account for the IETF week) Please indicate your support, comments, or objection, for adopting this draft as a working group item by April, 3rd, 2019 (aka 2019-04-03) We are particularly interested in hearing from working group members that are not co-authors of this draft. We are also looking for volunteers who would be ready to perform a technical review of this work at some later stage, such as before or during WG the last call. In parallel to this adoption call, I will send an IPR call for this document. We will need all authors and contributors to confirm their IPR position on this document. There is currently 1 IPR filled (2) (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-0 7 (2) https://datatracker.ietf.org/ipr/search/?id=draft-filsfils-spring-srv6-netwo rk-programming&submit=draft Thank you, --Bruno & Rob. ____________________________________________________________________________ _____________________________________________ 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 ou 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 been modified, changed or falsified. Thank you. ____________________________________________________________________________ _____________________________________________ 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 ou 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 been modified, changed or falsified. Thank you. ------=_NextPart_000_003D_01D4FCE5.BBAE2710 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi = chairs,

 

I hate to sound like a broken record. I just want to = get this issue clarified before we get to a late stage and risk being = forced to start again.

 

RFC 8200 = defers to RFC 4291 for the definition of an IPv6 address. RFC 4291 has a = somewhat simplistic and possibly historic definition of an IPv6 = address…

   IPv6 = addresses are 128-bit identifiers for interfaces and sets = of

   interfaces (where = "interface" is as defined in Section 2 of = [IPV6]).

…where the reference = was to RFC 2460 which (of course) is obsoleted by RFC 8200. RFC 8200 = has…

   = interface    a node's attachment to a = link.

   = address      an IPv6-layer identifier for an = interface or a set of

         &= nbsp;      interfaces.

 

Now, during = the adoption poll, I suggested that the chairs might like to ping 6man = to check that the proposed work in this draft is an acceptable = modification to this definition.

 

The = challenge, as far as I see it, is purely semantic. That is, we propose = to place in the DA field of an IPv6 header a value which is routable but = which does not identify an interface.

 

I am not = clear whether this represents an Update to RFC 8200 or to RFC 4291, but = I do strongly recommend that the chairs check with 6man that this = approach is not going to be rejected during IETF last = call.

 

Thanks,

Adrian

 

 

From: spring = <spring-bounces@ietf.org> On Behalf Of = bruno.decraene@orange.com
Sent: 24 April 2019 = 13:13
To: SPRING WG <spring@ietf.org>; = draft-filsfils-spring-srv6-network-programming@ietf.org
Subject: Re: [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming

 

Hi authors, = WG,

 

This = document has been accepted as a new WG document.

 

Authors, = please:

  • update email address of = authors
  • republish current/same draft (reviewed and = accepted by the WG) as = draft-ietf-spring-srv6-network-programming-00
  • publish -01 to reflect comments and agreement = made on the mailing list
  • reply to unanswered WG comments and engage = resolution on open points raised so far, in particular during WG = adoption call. E.g. (1), (2)

 

As an = additional point, this document is not intended to update RFC 8200. If a = behavior needs to update RFC 8200, it should be defined in a 6MAN draft = in the 6MAN WG and normatively referenced.

 

Thank = you,

--Bruno, Rob

 

  1. https://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqL= meGnVNlY
  2. https://mailarchive.ietf.org/arch/msg/spring/G_1ZqvInpZ9N2TX7TK8= zOLa-e9I

 

 

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of = bruno.decraene@orange.com
Sent: Wednesday, March 13, 2019 = 7:50 PM
To: SPRING WG
Cc: = draft-filsfils-spring-srv6-network-programming@ietf.org
Subject: [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming

 

Hi SPRING =
WG,
 
This email initiates a =
three week call for working group adoption for =
draft-filsfils-spring-srv6-network-programming. (Three weeks to account =
for the IETF week)
 
Please indicate your =
support, comments, or objection, for adopting this draft as a working =
group item by April, 3rd, 2019 (aka =
2019-04-03)
We are particularly =
interested in hearing from working group members that are not co-authors =
of this draft.
 
We are also looking for =
volunteers who would be ready to perform a technical review of this work =
at some later stage, such as before or during WG the last =
call.
 
In parallel to this =
adoption call, I will send an IPR call for this document. We will need =
all authors and contributors to confirm their IPR position on this =
document.
There is currently 1 IPR filled =
(2)
 
(1)  https://tools.ietf.org/html/draft-filsfils-spring-srv6-netwo=
rk-programming-07
(2)  https://datatracker.ietf.org/ipr/search/?id=3Ddraft-filsfils=
-spring-srv6-network-programming&submit=3Ddraft
 
 
Thank =
you,
--Bruno & Rob.

 

_______________________________________________________________=
__________________________________________________________
 
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 ou 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 been modified, =
changed or falsified.
Thank =
you.
_______________________________________________________________=
__________________________________________________________
 
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 ou 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 been modified, changed or =
falsified.
Thank =
you.
------=_NextPart_000_003D_01D4FCE5.BBAE2710-- From nobody Sat Apr 27 07:48:39 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D28B1200FB; Sat, 27 Apr 2019 07:48:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.201 X-Spam-Level: X-Spam-Status: No, score=-1.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_BOUND_DIGITS_15=0.798, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qHKerfnbotXj; Sat, 27 Apr 2019 07:48:35 -0700 (PDT) Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B7ED120096; Sat, 27 Apr 2019 07:48:35 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id p6so2988598pgh.9; Sat, 27 Apr 2019 07:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=jjeXKmiwY7fwNyhCS9ccqs1QZOmpL3L1oRNK+QOXnvE=; b=bMK5Ang7OwEFSBz+BHvRvWJzTFEBulniYmTVEtd3EcPu6BgVJ8Ddl2FZM20LJWbUNb WQsQH1Hf+6doH7FGNZh46feJna2CYmdXwaM+rWn4T7aHwtH6v3NCUKDAjIB6DSKJm0n1 Ny1vIg6rhN3F+aCF+URSC3UuEqJOK5UQs/kPDXJu3Bi+lEozEk1JWP3IcDJfSAtUAYLU nVWv/Rw+X9QJ74ay8KuXUgNN3vvc2777nIFa45du8z1AiqJQTVGrb8nN3LIqS/gbmd0D ZQQM+UtwOi0Sv5HxoTPzI5fcbo1TouN+49Yh6+dti1oUQeP5JCE9GSeahjiiAmXgpOi9 8U4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jjeXKmiwY7fwNyhCS9ccqs1QZOmpL3L1oRNK+QOXnvE=; b=K65O1v3bMGQVP0hfQYH73w9xED635yz3hHOxJG8mcja2JzUyN3ZVWXYFzTPeY6qj/0 pgFmP5BDyAQW+bHeoyKbGDVkfb2BVkOJ5qm9FlD2ZXs0pWPYBbWF53g/VzsI/nXyNCjk LNC3SYvoaWk65AOLT5Oc3B09/quD2eUDknY6pD8wsJz3K3SBdyVr012aHf4bS35FaoWk 5AfNVVf3VO9Hrg2r3Wc1I3FYEjv97BB6WdPUOlCnFboD54dYKiGNVDl3t+P1c23PI6m/ m3eiLbcNx4M+G0TAOZsA4BqRA1I9e5nU+gdRfuRsO607vWixh0IxTCc2dfgMgDYM3lSB 3y5A== X-Gm-Message-State: APjAAAX1himpgtCrE1HXjkCZ8njxCP12SIyxfQxt3UCIun7ZvgNJAa66 5D2FXBc4itmXJ/98OW5gO6U0WlCZqVwyEZsXYUEq4BzFjN0= X-Google-Smtp-Source: APXvYqyE/T8aZkNwBFOpJyKzmiwMbxDy9REZkn6z2BgcJ+u/yDXgMp92KdYzfvbnvySymQoY01hXBRY+OF/NlmbuhTc= X-Received: by 2002:a65:5941:: with SMTP id g1mr49972569pgu.51.1556376514200; Sat, 27 Apr 2019 07:48:34 -0700 (PDT) MIME-Version: 1.0 References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> In-Reply-To: <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> From: Robert Raszuk Date: Sat, 27 Apr 2019 16:48:23 +0200 Message-ID: To: Adrian Farrel Cc: spring-chairs@ietf.org, SPRING WG Content-Type: multipart/alternative; boundary="0000000000004407350587842550" Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 14:48:38 -0000 --0000000000004407350587842550 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Adrian, I think you are on a very slippery slope here :) Hope you are double diamond skier ! With point you are making here you are questioning encoding of any information in the last octets of IPv6 address as it does not meet definition of the interface address. Well for one let's observe that interface can be both physical and logical entity and as such especially being a logical one can be tight with a service switching vector in any network element. So even based on all IPv6 related RFCs you have quoted it does not violate any. Then in one shot you are dismissing sound project like TeraStream or even recent pretty interesting proposals like draft-li-6man-service-aware-ipv6-network. And if you look at 6man list you see that there was some discussion about this draft and no one questioned the point of potential "abuse" of semantics of IPv6 address as such. Therefor till that happens I think there is nothing blocking SPRING to proceed with adoption of draft-filsfils-spring-srv6-network-programming. Best, Robert. On Sat, Apr 27, 2019 at 11:41 AM Adrian Farrel wrote: > Hi chairs, > > > > I hate to sound like a broken record. I just want to get this issue > clarified before we get to a late stage and risk being forced to start > again. > > > > RFC 8200 defers to RFC 4291 for the definition of an IPv6 address. RFC > 4291 has a somewhat simplistic and possibly historic definition of an IPv= 6 > address=E2=80=A6 > > IPv6 addresses are 128-bit identifiers for interfaces and sets of > > interfaces (where "interface" is as defined in Section 2 of [IPV6]). > > =E2=80=A6where the reference was to RFC 2460 which (of course) is obsolet= ed by RFC > 8200. RFC 8200 has=E2=80=A6 > > interface a node's attachment to a link. > > address an IPv6-layer identifier for an interface or a set of > > interfaces. > > > > Now, during the adoption poll, I suggested that the chairs might like to > ping 6man to check that the proposed work in this draft is an acceptable > modification to this definition. > > > > The challenge, as far as I see it, is purely semantic. That is, we propos= e > to place in the DA field of an IPv6 header a value which is routable but > which does not identify an interface. > > > > I am not clear whether this represents an Update to RFC 8200 or to RFC > 4291, but I do strongly recommend that the chairs check with 6man that th= is > approach is not going to be rejected during IETF last call. > > > > Thanks, > > Adrian > > > > > > *From:* spring *On Behalf Of * > bruno.decraene@orange.com > *Sent:* 24 April 2019 13:13 > *To:* SPRING WG ; > draft-filsfils-spring-srv6-network-programming@ietf.org > *Subject:* Re: [spring] Working Group Adoption Call for > draft-filsfils-spring-srv6-network-programming > > > > Hi authors, WG, > > > > This document has been accepted as a new WG document. > > > > Authors, please: > > - update email address of authors > - republish current/same draft (reviewed and accepted by the WG) as > draft-ietf-spring-srv6-network-programming-00 > - publish -01 to reflect comments and agreement made on the mailing > list > - reply to unanswered WG comments and engage resolution on open points > raised so far, in particular during WG adoption call. E.g. (1), (2) > > > > As an additional point, this document is not intended to update RFC 8200. > If a behavior needs to update RFC 8200, it should be defined in a 6MAN > draft in the 6MAN WG and normatively referenced. > > > > Thank you, > > --Bruno, Rob > > > > 1. > https://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqLmeGnVN= lY > 2. > https://mailarchive.ietf.org/arch/msg/spring/G_1ZqvInpZ9N2TX7TK8zOLa-e= 9I > > > > > > > > *From:* spring [mailto:spring-bounces@ietf.org] *On Behalf Of * > bruno.decraene@orange.com > *Sent:* Wednesday, March 13, 2019 7:50 PM > *To:* SPRING WG > *Cc:* draft-filsfils-spring-srv6-network-programming@ietf.org > *Subject:* [spring] Working Group Adoption Call for > draft-filsfils-spring-srv6-network-programming > > > > Hi SPRING WG, > > > > This email initiates a three week call for working group adoption for dra= ft-filsfils-spring-srv6-network-programming. (Three weeks to account for th= e IETF week) > > > > Please indicate your support, comments, or objection, for adopting this d= raft as a working group item by April, 3rd, 2019 (aka 2019-04-03) > > We are particularly interested in hearing from working group members that= are not co-authors of this draft. > > > > We are also looking for volunteers who would be ready to perform a techni= cal review of this work at some later stage, such as before or during WG th= e last call. > > > > In parallel to this adoption call, I will send an IPR call for this docum= ent. We will need all authors and contributors to confirm their IPR positio= n on this document. > > There is currently 1 IPR filled (2) > > > > (1) https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-progr= amming-07 > > (2) https://datatracker.ietf.org/ipr/search/?id=3Ddraft-filsfils-spring-= srv6-network-programming&submit=3Ddraft > > > > > > Thank you, > > --Bruno & Rob. > > > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu 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 i= nformation 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 de= lete 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. > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu 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 i= nformation 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 de= lete 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. > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > --0000000000004407350587842550 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Ad= rian,

I think you are= on a very slippery slope here :) Hope you are double diamond skier !=C2=A0=

With point you are ma= king here you are questioning encoding of any information in the last octet= s of IPv6 address as it does not meet definition of the interface address.= =C2=A0

Well for one le= t's observe that interface can be both physical and logical entity and = as such especially being a logical one can be tight with a service switchin= g vector in any network element. So even based on all IPv6 related RFCs you= have quoted it does not violate any.=C2=A0

Then in one shot you are dismissing sound project lik= e TeraStream or even recent pretty interesting proposals like=C2=A0draft-li= -6man-service-aware-ipv6-network. And if you look at 6man list you see that= there was some discussion about this draft and no one questioned the point= of potential "abuse" of semantics of IPv6 address as such.
=

Therefor till that happens = I think there is nothing blocking SPRING to proceed with adoption of=C2=A0d= raft-filsfils-spring-srv6-network-programming.=C2=A0

Best,
Robert.
<= div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif= ;font-size:small">

On Sat, Apr 27, 2019 at 11:41 AM Ad= rian Farrel <adrian@olddog.co.uk<= /a>> wrote:
<= div lang=3D"EN-GB">
=

Hi chairs,

<= u>=C2=A0

I hate to sound like a broken= record. I just want to get this issue clarified before we get to a late st= age and risk being forced to start again.

=C2=A0

RFC 8200 defers to RF= C 4291 for the definition of an IPv6 address. RFC 4291 has a somewhat simpl= istic and possibly historic definition of an IPv6 address=E2=80=A6

=C2=A0=C2=A0 IPv6 addresses are 128-bit ide= ntifiers for interfaces and sets of

=C2=A0=C2=A0 interfaces (where "interface" is as defined in Sect= ion 2 of [IPV6]).

=E2=80=A6where th= e reference was to RFC 2460 which (of course) is obsoleted by RFC 8200. RFC= 8200 has=E2=80=A6

=C2=A0=C2=A0 int= erface=C2=A0=C2=A0=C2=A0 a node's attachment to a link.

=C2=A0=C2=A0 address=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= an IPv6-layer identifier for an interface or a set of

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 interfaces.

=C2=A0

Now, during t= he adoption poll, I suggested that the chairs might like to ping 6man to ch= eck that the proposed work in this draft is an acceptable modification to t= his definition.

=C2=A0

The challenge, as far as I see it, is purely se= mantic. That is, we propose to place in the DA field of an IPv6 header a va= lue which is routable but which does not identify an interface. <= /u>

=C2=A0

I am not clear whether this represents an Update to RFC 8200 or to RFC 42= 91, but I do strongly recommend that the chairs check with 6man that this a= pproach is not going to be rejected during IETF last call.

=C2=A0

Than= ks,

Adrian

=C2=A0

=C2= =A0

From: spring <spring-bounces@ietf.org> On Behalf Of bruno.decraene@orange.comSent: 24 April 2019 13:13
To: SPRING WG <spring@ietf.org>; draft-filsfils-spring-srv6-network-programming@ietf.org
S= ubject: Re: [spring] Working Group Adoption Call for draft-filsfils-spr= ing-srv6-network-programming

=C2=A0

Hi authors, WG,=

=C2=A0

This document has been accepted as a new= WG document.

=C2=A0

Author= s, please:

  • update email address of authors
  • republish current/= same draft (reviewed and accepted by the WG) as draft-ietf-spring-srv6-netw= ork-programming-00
  • publish -01 to reflect comments and agreement made on the mailing list=
  • reply to unan= swered WG comments and engage resolution on open points raised so far, in p= articular during WG adoption call. E.g. (1), (2)
    • <= /ul>

    =C2=A0

    As an additional point, this document is= not intended to update RFC 8200. If a behavior needs to update RFC 8200, i= t should be defined in a 6MAN draft in the 6MAN WG and normatively referenc= ed.

    =C2=A0

    Thank you,

    --Bruno, Rob

    =C2=A0

    1. http= s://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqLmeGnVNlY=
    2. = https://mailarchive.ietf.org/arch/msg/spring/G_= 1ZqvInpZ9N2TX7TK8zOLa-e9I

    =C2=A0

    =C2=A0

    =C2=A0

    From: spring [mailto:spring-bounces@ietf.org]= On Behalf Of bruno.decraene@orange.com
    Sent: Wednesday, March 13,= 2019 7:50 PM
    To: SPRING WG
    Cc: draft= -filsfils-spring-srv6-network-programming@ietf.org
    Subject: [= spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-= programming

    =C2=A0

    Hi SPRING WG,
    =C2=A0
    This email initiates a three week call for working group ado=
ption for draft-filsfils-spring-srv6-network-programming. (Three weeks to a=
ccount for the IETF week)
    =C2=A0
    Please indicate your support, =
comments, or objection, for adopting this draft as a working group item by =
April, 3rd, 2019 (aka 2019-04-03)
    We are particularly inte= rested in hearing from working group members that are not co-authors of thi= s draft.
    =C2=A0
    We are also looking for volunteers who would be=
 ready to perform a technical review of this work at some later stage, such=
 as before or during WG the last call.
    =C2=A0
    In parallel to th=
is adoption call, I will send an IPR call for this document. We will need a=
ll authors and contributors to confirm their IPR position on this document.=

    There is currently 1 IPR filled (2)
    =C2=A0
    =
(1)=C2=A0 https://tools.ietf.org/html/draft-filsfils-spring-srv6-network=
-programming-07=

    (=
2)=C2=A0 https://datatracker.ietf.org/=
ipr/search/?id=3Ddraft-filsfils-spring-srv6-network-programming&submit=
=3Ddraft
    <=
pre style=3D"margin-left:35.4pt">=C2=A0<=
/span>
    =
=C2=A0
    Thank you,
    <=
span lang=3D"FR">--Bruno & Rob.

    =C2=A0

    __________=
___________________________________________________________________________=
____________________________________
    =C2=A0
    = 
    Ce message et ses piece=
s jointes peuvent contenir des informations confidentielles ou privilegiees=
 et ne doivent donc
    pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<=
u>
    a l&=
#39;expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
    = 
    Orange decline toute re=
sponsabilite si ce message a ete altere, deforme ou falsifie. Merci.
    =C2=A0
    This message and its attachments m=
ay contain confidential or privileged information that may be protected by =
law;
    they should not be distributed, used or copied without authorisa=
tion.
    If you have received this email in error, please notify the sen=
der and delete this message and its attachments.
    = 
    As emails may be alt=
ered, Orange is not liable for messages that have been modified, changed or=
 falsified.
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--0000000000004407350587842550-- From nobody Sat Apr 27 08:04:37 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 86B4412027A; Sat, 27 Apr 2019 08:04:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dDN9qdSz_EmS; Sat, 27 Apr 2019 08:04:24 -0700 (PDT) Received: from mta8.iomartmail.com (mta8.iomartmail.com [62.128.193.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4C127120195; Sat, 27 Apr 2019 08:04:24 -0700 (PDT) Received: from vs2.iomartmail.com (vs2.iomartmail.com [10.12.10.123]) by mta8.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RF4Kx7007164; Sat, 27 Apr 2019 16:04:20 +0100 Received: from vs2.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 56D2822044; Sat, 27 Apr 2019 16:04:20 +0100 (BST) Received: from asmtp3.iomartmail.com (unknown [10.12.10.224]) by vs2.iomartmail.com (Postfix) with ESMTPS id 417F022042; Sat, 27 Apr 2019 16:04:20 +0100 (BST) Received: from LAPTOPK7AS653V ([87.112.228.68]) (authenticated bits=0) by asmtp3.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RF4GEE023858 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 27 Apr 2019 16:04:18 +0100 Reply-To: From: "Adrian Farrel" To: "'Robert Raszuk'" Cc: , "'SPRING WG'" References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> In-Reply-To: Date: Sat, 27 Apr 2019 16:04:15 +0100 Organization: Old Dog Consulting Message-ID: <006c01d4fd0a$7c868d00$7593a700$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006D_01D4FD12.DE4AF500" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQKiuZZ85wkSAmxndBno69hsKyy+2gKnS9woAZ3mRgkCHHBxEaSBkKVg Content-Language: en-gb X-Originating-IP: 87.112.228.68 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-24578.000 X-TM-AS-Result: No--25.691-10.0-31-10 X-imss-scan-details: No--25.691-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-24578.000 X-TMASE-Result: 10--25.691400-10.000000 X-TMASE-MatchedRID: hwsFDxVJcFnxIbpQ8BhdbOYAh37ZsBDC1kqyrcMalqWsafcFLFlU1OuD Mfic3iGlsl/Z/K9F5YfOUdXJKeWa6BxgewaS64+lxWVUEDiMVuXRahuPwaQ1Wrl+jVyLzmC75bW DW7fmAqGjkoEn/gUJLSWsmcr876eyjQyf9QArOhS3UCG/IQp2PpCobo6XQuiXWSw/UjSfbBKpUy ionL7As2sjvOI8vywNeYv9A31OZBS+/DppUgeV19OEZs/2oH3cbv16+gil4jdaW2Ktn+I8/gbl7 9j0a6cvLb+kQGWWixK2U3/zNNxM1nHMXURFxRSfKZFOaQbj6h/p8lxWp2elln/Lb02dPs4DERqB iXGj3g/PXLWRe+pCxb5D/wnFOv2OIW+cbD7Ubb1+H/Q3vgskAm2yXuVfuC5SzEiVVagx81bXrpd vf8fDg8j7UgEgBlpxe0HF0ouRBVhHW+94FA8JF8K1Ib9JAALxrogFtKd/P7eW+zaNLK605OygQW dkAVMs0Nt5/j+aSDEUI4s17Ql301mKiy1F9pgLQesjq8XPMbt3Bf9JIqsoeA8YwboCQc88TpCjy rDxEWtGfJ4XSK6qrqdCIx24gQ82CiwghyPO0y4SDAzxRL+lManvPLpXAU/WSwcZtVb90bADpLlZ JCSlu4RXPWBWtXbGikIrrhkh8x+7lpQUW6UvzyI9MxSOQ6CSLVEjAx3HjK6YI2SdJezB/7QREYZ m2yynNQtn/DQ9imA2dP5Jp+V/8ZcFdomgH0lnFEUknJ/kEl5ZDL1gLmoa/JiPn2g4sHYaYXlfnK 7BOiGQMyQxL0SO7eAdWb3yJgklWhkg9Gx8tMQWM99ewzOan+51dopjKlNb X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:04:35 -0000 This is a multipart message in MIME format. ------=_NextPart_000_006D_01D4FD12.DE4AF500 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hey Robert, =20 Thanks for your response, but I think you are not taking my requests at = face value. =20 > I think you are on a very slippery slope here :) Hope you are > double diamond skier !=20 =20 As it happens. But perhaps that is not wholly relevant. =20 > With point you are making here you are questioning encoding of any > information in the last octets of IPv6 address as it does not meet = definition > of the interface address.=20 =20 Am I questioning that, or am I pointing out that this is not consistent = with current definitions and so it might be a good idea to get = everything lined up and agreed. =20 > Well for one let's observe that interface can be both physical and = logical > entity and as such especially being a logical one can be tight with a=20 > service switching vector in any network element. So even based on all > IPv6 related RFCs you have quoted it does not violate any.=20 =20 This is certainly one way around the concern. If we define = =E2=80=9Cinterfaces to functions=E2=80=9D (such as an interface to a = VRF) then we may be done. That would be relatively easy to achieve with = a simple section in the network programming draft. =20 > Then in one shot you are dismissing sound project like TeraStream > or even recent pretty interesting proposals like = draft-li-6man-service- > aware-ipv6-network. =20 I am dismissing nothing. I am not even commenting on the technologies. I = am seeking to get our document set to be consistent.=20 =20 > And if you look at 6man list you see that there was some discussion > about this draft and no one questioned the point of potential "abuse" > of semantics of IPv6 address as such. =20 Then (I assume) there is no issue to confirming this particular point = and to getting all of the ducks lined up. =20 > Therefor till that happens I think there is nothing blocking SPRING to > proceed with adoption of = draft-filsfils-spring-srv6-network-programming.=20 =20 Maybe you missed Bruno=E2=80=99s post? The draft has already been = adopted by the SPRING WG. There is no question of blocking that step.=20 =20 Just to repeat (since it has apparently been repeatedly missed in = reading my emails on this topic, and was even the cause of some heat in = a face-to-face conversation I had in Prague) I am not seeking to block = anything. What I want to do is get everything aligned. I want to be sure = that we have agreement early rather than having a = =E2=80=9Cfight=E2=80=9D late in the day when pressures will be more = severe. =20 I simply don=E2=80=99t understand any reluctance to bring this = discussion into the open and make sure we understand how the = architectures and terminology line up. =20 Thanks, Adrian ------=_NextPart_000_006D_01D4FD12.DE4AF500 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hey Robert,

 

Thanks for = your response, but I think you are not taking my requests at face = value.

 

> I think = you are on a very slippery slope here :) Hope you = are

> double = diamond skier ! 

 

As it = happens. But perhaps that is not wholly = relevant.

 

> With = point you are making here you are questioning encoding of = any

> = information in the last octets of IPv6 address as it does not meet = definition

> of the = interface address. 

 

Am I = questioning that, or am I pointing out that this is not consistent with = current definitions and so it might be a good idea to get everything = lined up and agreed.

 

> Well for = one let's observe that interface can be both physical and = logical

> entity = and as such especially being a logical one can be tight with a =

> service = switching vector in any network element. So even based on = all

> IPv6 = related RFCs you have quoted it does not violate = any. 

 

This is certainly one = way around the concern. If we define =E2=80=9Cinterfaces to = functions=E2=80=9D (such as an interface to a VRF) then we may be done. = That would be relatively easy to achieve with a simple section in the = network programming draft.

 

> Then in = one shot you are dismissing sound project like = TeraStream

> or even = recent pretty interesting proposals = like draft-li-6man-service-

> = aware-ipv6-network.

 

I am dismissing = nothing. I am not even commenting on the technologies. I am seeking to = get our document set to be consistent.

 

> And if = you look at 6man list you see that there was some = discussion

> about = this draft and no one questioned the point of potential = "abuse"

> of = semantics of IPv6 address as such.

 

Then (I = assume) there is no issue to confirming this particular point and to = getting all of the ducks lined up.

 

> Therefor = till that happens I think there is nothing blocking SPRING = to

> proceed = with adoption = of draft-filsfils-spring-srv6-network-programming. <= /span>

 

Maybe you missed = Bruno=E2=80=99s post? The draft has already been adopted by the SPRING = WG. There is no question of blocking that step.

 

Just to repeat (since = it has apparently been repeatedly missed in reading my emails on this = topic, and was even the cause of some heat in a face-to-face = conversation I had in Prague) I am not seeking to block anything. What I = want to do is get everything aligned. I want to be sure that we have = agreement early rather than having a =E2=80=9Cfight=E2=80=9D late in the = day when pressures will be more severe.

 

I simply = don=E2=80=99t understand any reluctance to bring this discussion into = the open and make sure we understand how the architectures and = terminology line up.

 

Thanks,

Adrian

------=_NextPart_000_006D_01D4FD12.DE4AF500-- From nobody Sat Apr 27 08:14:33 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3413812013C; Sat, 27 Apr 2019 08:14:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qu2sdtyokGN1; Sat, 27 Apr 2019 08:14:27 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 78F031200D7; Sat, 27 Apr 2019 08:14:27 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 44rvbR1VWjzVfqW; Sat, 27 Apr 2019 08:14:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1556378067; bh=8villj6H10G5afpUg9KCg7VOSYvyLGmYUPi3Aj4EDAQ=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=iAlzz1iAwg7AEWMiOX5FPVMM8uK/2Gph0oCPdpt658z/cw04hLXUGGW5sxsVwC+m9 lOdQnXQkKkRllj/8PdhS8+nxxcrd0yoBvl0SoJylby5h0nlRZdlBEX4b2zyvGwU0YF dGBRWYzqnsag4sWmeqrECpv/RmnqmFWxeGg1Gwlk= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 44rvbQ1nJVzKs5j; Sat, 27 Apr 2019 08:14:26 -0700 (PDT) To: Robert Raszuk , Adrian Farrel Cc: SPRING WG , spring-chairs@ietf.org References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> From: "Joel M. Halpern" Message-ID: Date: Sat, 27 Apr 2019 11:14:25 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:14:31 -0000 Actually Robert, a number of people have suggested on the 6man lsit that the overloading of IPv6 addresses to also represent functions to be performed is a problem. And have put proposals on the table to get out of the problem rather than just pretending is a good idea. Yours, Joel On 4/27/19 10:48 AM, Robert Raszuk wrote: > Hi Adrian, > > I think you are on a very slippery slope here :) Hope you are double > diamond skier ! > > With point you are making here you are questioning encoding of any > information in the last octets of IPv6 address as it does not meet > definition of the interface address. > > Well for one let's observe that interface can be both physical and > logical entity and as such especially being a logical one can be tight > with a service switching vector in any network element. So even based on > all IPv6 related RFCs you have quoted it does not violate any. > > Then in one shot you are dismissing sound project like TeraStream or > even recent pretty interesting proposals > like draft-li-6man-service-aware-ipv6-network. And if you look at 6man > list you see that there was some discussion about this draft and no one > questioned the point of potential "abuse" of semantics of IPv6 address > as such. > > Therefor till that happens I think there is nothing blocking SPRING to > proceed with adoption of draft-filsfils-spring-srv6-network-programming. > > Best, > Robert. > > > On Sat, Apr 27, 2019 at 11:41 AM Adrian Farrel > wrote: > > Hi chairs,____ > > __ __ > > I hate to sound like a broken record. I just want to get this issue > clarified before we get to a late stage and risk being forced to > start again.____ > > __ __ > > RFC 8200 defers to RFC 4291 for the definition of an IPv6 address. > RFC 4291 has a somewhat simplistic and possibly historic definition > of an IPv6 address…____ > >    IPv6 addresses are 128-bit identifiers for interfaces and sets > of____ > >    interfaces (where "interface" is as defined in Section 2 of > [IPV6]).____ > > …where the reference was to RFC 2460 which (of course) is obsoleted > by RFC 8200. RFC 8200 has…____ > >    interface    a node's attachment to a link.____ > >    address      an IPv6-layer identifier for an interface or a set > of____ > >                 interfaces.____ > > __ __ > > Now, during the adoption poll, I suggested that the chairs might > like to ping 6man to check that the proposed work in this draft is > an acceptable modification to this definition.____ > > __ __ > > The challenge, as far as I see it, is purely semantic. That is, we > propose to place in the DA field of an IPv6 header a value which is > routable but which does not identify an interface. ____ > > __ __ > > I am not clear whether this represents an Update to RFC 8200 or to > RFC 4291, but I do strongly recommend that the chairs check with > 6man that this approach is not going to be rejected during IETF last > call.____ > > __ __ > > Thanks,____ > > Adrian____ > > __ __ > > __ __ > > *From:*spring > *On Behalf Of > *bruno.decraene@orange.com > *Sent:* 24 April 2019 13:13 > *To:* SPRING WG >; > draft-filsfils-spring-srv6-network-programming@ietf.org > > *Subject:* Re: [spring] Working Group Adoption Call for > draft-filsfils-spring-srv6-network-programming____ > > __ __ > > Hi authors, WG,____ > > __ __ > > This document has been accepted as a new WG document.____ > > __ __ > > Authors, please:____ > > * update email address of authors____ > * republish current/same draft (reviewed and accepted by the WG) > as draft-ietf-spring-srv6-network-programming-00____ > * publish -01 to reflect comments and agreement made on the > mailing list____ > * reply to unanswered WG comments and engage resolution on open > points raised so far, in particular during WG adoption call. > E.g. (1), (2)____ > > __ __ > > As an additional point, this document is not intended to update RFC > 8200. If a behavior needs to update RFC 8200, it should be defined > in a 6MAN draft in the 6MAN WG and normatively referenced.____ > > __ __ > > Thank you,____ > > --Bruno, Rob____ > > __ __ > > 1. https://mailarchive.ietf.org/arch/msg/spring/ulYVHKfb6h4fOtM8kqLmeGnVNlY____ > 2. https://mailarchive.ietf.org/arch/msg/spring/G_1ZqvInpZ9N2TX7TK8zOLa-e9I____ > > __ __ > > __ __ > > __ __ > > *From:*spring [mailto:spring-bounces@ietf.org > ] *On Behalf Of > *bruno.decraene@orange.com > *Sent:* Wednesday, March 13, 2019 7:50 PM > *To:* SPRING WG > *Cc:* draft-filsfils-spring-srv6-network-programming@ietf.org > > *Subject:* [spring] Working Group Adoption Call for > draft-filsfils-spring-srv6-network-programming____ > > __ __ > > Hi SPRING WG,____ > > __ __ > > This email initiates a three week call for working group adoption > for draft-filsfils-spring-srv6-network-programming. (Three weeks to > account for the IETF week)____ > > __ __ > > Please indicate your support, comments, or objection, for adopting > this draft as a working group item by April, 3^rd , 2019 (aka > 2019-04-03)____ > > We are particularly interested in hearing from working group members > that are not co-authors of this draft.____ > > __ __ > > We are also looking for volunteers who would be ready to perform a > technical review of this work at some later stage, such as before or > during WG the last call.____ > > __ __ > > In parallel to this adoption call, I will send an IPR call for this > document. We will need all authors and contributors to confirm their > IPR position on this document.____ > > There is currently 1 IPR filled (2)____ > > __ __ > > __(1)__https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07____ > > __(2)__https://datatracker.ietf.org/ipr/search/?id=draft-filsfils-spring-srv6-network-programming&submit=draft____ > > __ __ > > __ __ > > Thank you,____ > > --Bruno & Rob.____ > > __ __ > > _____________________________________________________________________________________________________________________________ > > __ __ > > 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 ou 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 been modified, changed or falsified.____ > > Thank you.____ > > _____________________________________________________________________________________________________________________________ > > __ __ > > 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 ou 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 been modified, changed or falsified.____ > > Thank you.____ > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Sat Apr 27 08:15:42 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CBB34120147 for ; Sat, 27 Apr 2019 08:15:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ypqw6-3ekMgl for ; Sat, 27 Apr 2019 08:15:38 -0700 (PDT) Received: from mail-qt1-x835.google.com (mail-qt1-x835.google.com [IPv6:2607:f8b0:4864:20::835]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8F1C912013C for ; Sat, 27 Apr 2019 08:15:38 -0700 (PDT) Received: by mail-qt1-x835.google.com with SMTP id f25so7440448qtc.8 for ; Sat, 27 Apr 2019 08:15:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=oy5UJYF+7xkI6IG2jPkpH9900k6qK3EKpdLB54LDiQo=; b=eCH8QjS9qwL1d8hK6h6bRRjKNLTuGQfOSJ5p8yy/ycf/lBQjvbBsdZqsxY9RxRQXEZ ZdnVJQPdsX0rOiwMyeFTzbzHYLTgobLikN1028w/gr+lc4sryDkK0uAQkUvXT5u5P2J9 25iR28HaRiJP8lsbx0sR49YpQc8Zu+DsxH/G8lcqpyHiROvKo+pLEUOfrenxhsn+zHZb CFXVyaBbcdTW9kJHSLPIYvVwVGFb0/BXh9N5nT/qA4P7xchrD5UWMoG+EPYlqODbYIq1 QKCo9jC5V3F4hDk9M4D41/oy/AQG3fjDGslAtdnRuluKd5VRuYB4oI8iV5y6qrNriB37 xnGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=oy5UJYF+7xkI6IG2jPkpH9900k6qK3EKpdLB54LDiQo=; b=lN1USuipwkqzL13SMKdX5TlTc9o/jop9DqJcAS/vv+x0luexCywF1xoLl3xS1MB/dy lFdiUAb4RaXaE08itA9VDQOxyGq38J5VL+y4YAgt3tlb+BUwNRwOz9c8qPdQMmNP8Rxl EGuHPkJdOrsT+09C2/k6AsafFMuEWEjDEMo3w73rI6Ix3cSvQsAPNjYx8C+up6SuJhlb 2AsmE5FJUtt3i2QNcs2JiJZ4SF2uSktBbgbEJt/Gx8clb218NQwFO/xZ/qlfcvKFG5Jn 4dmBpjae952OLAu9Ekadi4lMPVIoZJA2nvS/NOXRelFafZnFjl435tMRF/FhejB8RVDZ psAA== X-Gm-Message-State: APjAAAWk5sL4bncP68WGBW8KG8jHafGBct6z1yIVi+iYunF/MfomxPxc WBAMmb+Ur4X+Pj0detmTqvgRQUL9saLH34etHScavA== X-Google-Smtp-Source: APXvYqzSemhDwk775mPnl8Vin9ZWJbvXlvNkmbFhu2Vo11RxRoa04Rj2qAccdo28/ETONvI3WxsiVyzzb4UfJX6k3hA= X-Received: by 2002:a0c:a8d5:: with SMTP id h21mr24581721qvc.124.1556378137596; Sat, 27 Apr 2019 08:15:37 -0700 (PDT) MIME-Version: 1.0 References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> <006c01d4fd0a$7c868d00$7593a700$@olddog.co.uk> In-Reply-To: <006c01d4fd0a$7c868d00$7593a700$@olddog.co.uk> From: Robert Raszuk Date: Sat, 27 Apr 2019 17:15:27 +0200 Message-ID: To: adrian@olddog.co.uk Cc: Robert Raszuk , SPRING WG , spring-chairs@ietf.org Content-Type: multipart/alternative; boundary="000000000000072b5005878486e6" Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:15:41 -0000 --000000000000072b5005878486e6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey Adrian, > Well for one let's observe that interface can be both physical and logica= l > > > entity and as such especially being a logical one can be tight with a > > > service switching vector in any network element. So even based on all > > > IPv6 related RFCs you have quoted it does not violate any. > > > > This is certainly one way around the concern. If we define =E2=80=9Cinter= faces to > functions=E2=80=9D (such as an interface to a VRF) then we may be done. T= hat would > be relatively easy to achieve with a simple section in the network > programming draft. > So it seems we have a solution to your concern. If WG decides to augement the WG doc with such defintion it seems to be done deal. Just to repeat (since it has apparently been repeatedly missed in reading > my emails on this topic, and was even the cause of some heat in a > face-to-face conversation I had in Prague) I am not seeking to block > anything. What I want to do is get everything aligned. I want to be sure > that we have agreement early rather than having a =E2=80=9Cfight=E2=80=9D= late in the day > when pressures will be more severe. > > I simply don=E2=80=99t understand any reluctance to bring this discussio= n into > the open and make sure we understand how the architectures and terminolog= y > line up. > Well as an observer I see the interesting coincidence of such comments popping up in the same time as alternative proposals to define yet one more new mapping scheme of IDs to service functions and to not embed them as part of 128 bits. So the conclusions are coming out pretty automatically about overall strategy :) Cheers, R. --000000000000072b5005878486e6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey Adrian,

=

> Well for one let= 's observe that interface can be both physical and logical

> entity and as such especially being a logical one can be tight w= ith a

> service switching vector in any network elemen= t. So even based on all

> IPv6 related RFCs you have qu= oted it does not violate any.=C2=A0

= =C2=A0

This is certainly one way around the concern. If w= e define =E2=80=9Cinterfaces to functions=E2=80=9D (such as an interface to= a VRF) then we may be done. That would be relatively easy to achieve with = a simple section in the network programming draft.


So it seems we have a solution to your concer= n. If WG decides to augement the WG doc with such defintion it seems to be = done deal.=C2=A0

Just to repeat (since it has apparently been repeatedl= y missed in reading my emails on this topic, and was even the cause of some= heat in a face-to-face conversation I had in Prague) I am not seeking to b= lock anything. What I want to do is get everything aligned. I want to be su= re that we have agreement early rather than having a =E2=80=9Cfight=E2=80= =9D late in the day when pressures will be more severe.

=C2=A0I simply don=E2=80=99t understand any reluctance to brin= g this discussion into the open and make sure we understand how the archite= ctures and terminology line up.


=
Well as an observer I see the interesting coincidence of such comments= popping up in the same time as alternative proposals to define yet one mor= e new mapping scheme of IDs to service functions and to not embed them as p= art of 128 bits. So the conclusions are coming out pretty automatically abo= ut overall strategy :)=C2=A0

Cheers,
R.
--000000000000072b5005878486e6-- From nobody Sat Apr 27 08:23:59 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6CEE812015B for ; Sat, 27 Apr 2019 08:23:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mtlSK-mOQcN3 for ; Sat, 27 Apr 2019 08:23:55 -0700 (PDT) Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3353F1200D7 for ; Sat, 27 Apr 2019 08:23:55 -0700 (PDT) Received: by mail-qt1-x82d.google.com with SMTP id y49so1765083qta.7 for ; Sat, 27 Apr 2019 08:23:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=mNW6NWsLxb99O5vGcEz2bF5MRPLBH23VP8XMXK8Su2o=; b=cy4iEuA3LpG83WlCoJ+LTgOVl63Hpnd+rSHViL5WQuzPUh8VMlH52E74+cRgQXAn7C NdPClNQH3UaoQg2MAIPvBNL6kC5IolBM9U4YkGMOViIaONQGHjRE6JUqHym7oST9uXu+ F3YafZD+lBaWcJqCx0tRWhB40wXd2Gs88DSoF6n15Ngeb3r9V51YH9C1dgPDnWzMaWhE K6RdsAYYF+Iz1jlZudNKZy5quGq9UO2TYYmvSRRdZDEDteB2G781SfurRDzhCC5rsWWJ HxzStVIgloqHnZ101ix8a53VClcFCPpjrQm9Bgx/t2NdOjYT0TlVFfWt7kTMME0CivBb zLsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=mNW6NWsLxb99O5vGcEz2bF5MRPLBH23VP8XMXK8Su2o=; b=dDwiYyykgeYM8JxtjBh7hbdjH6DIVxQFXFxMMwb9sK1LgrAH6/qiKqcM0peNxbF+oU liEe2apAd2tBtaQNTSXcXvooH+tKZSSURSPs2Ie51SSiPswswVCOvffvRC2w6tbPkI/+ We7HAeuQc7L6qZyisbPkq3KhpIAQa6lRtKYgqmMu5jlsiQSTUSEy/UcrD9J7P1LEb8Nz KfRo0QRW/oEGPL+AzU/0VdK29cGZ/gA3FFvHRtnT+IJcKkte0LCO3xBx1vFrwvztBLJz iP1l4PsGrRqhGlyEBRLc11Fnei9OLpzi3B29i64GXq3iq4Ak7AgPS3baAmiS8D2SiAIc RthQ== X-Gm-Message-State: APjAAAUC9ysqcxz+FG5KtT7LN9I1mHfdPUVRZy8Umb/Vc+bXx+CdcmEt 4bnlVdC3+NDLWnfwQlrq/kGe3ehS8NqzaSaB47i/3g== X-Google-Smtp-Source: APXvYqyqyZ6drRTCMBLCjATjgVk2Nr8MXeoGPt8Gtmx96zmPDL1u+S9575FijezTR0YN50rgl5F0Rdv1nHPNYsOkkqs= X-Received: by 2002:aed:30c1:: with SMTP id 59mr40676065qtf.277.1556378634321; Sat, 27 Apr 2019 08:23:54 -0700 (PDT) MIME-Version: 1.0 References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> In-Reply-To: From: Robert Raszuk Date: Sat, 27 Apr 2019 17:23:44 +0200 Message-ID: To: "Joel M. Halpern" Cc: Robert Raszuk , Adrian Farrel , SPRING WG , spring-chairs@ietf.org Content-Type: multipart/alternative; boundary="000000000000a2976f058784a364" Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:23:58 -0000 --000000000000a2976f058784a364 Content-Type: text/plain; charset="UTF-8" Joel, Imagine I get IPv4 /28 block or IPv6 /64 block of address space. Isn't it my own business how I map and to what I map my non globally routable last bits of such address ? Does anyone care - specifically would IETF have right to care - if one /32 or /128 address is used in my house to turn on the AC or coffee machine and some other to turn it off ? Those would be my embedded functions in IPv4 or IPv6 addresses. Of course there is tons of other ways to achieve such functions but those are just examples for illustration purposes. Cheers, R. On Sat, Apr 27, 2019 at 5:14 PM Joel M. Halpern wrote: > Actually Robert, a number of people have suggested on the 6man lsit that > the overloading of IPv6 addresses to also represent functions to be > performed is a problem. And have put proposals on the table to get out > of the problem rather than just pretending is a good idea. > > Yours, > Joel --000000000000a2976f058784a364 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Joel,

Imagine I get IPv4 /28= block or IPv6 /64 block of address space.=C2=A0

I= sn't it my own business how I map and to what I map my non globally rou= table last bits of such address ?=C2=A0

Does anyon= e care - specifically would IETF have right to care - if one /32 or /128 ad= dress is used in my house to turn on the AC or coffee machine and some othe= r to turn it off ?=C2=A0

Those would be my embedde= d functions in IPv4 or IPv6 addresses. Of course there is tons of other way= s to achieve such functions but those are just examples for illustration pu= rposes.=C2=A0

Cheers,
R.

On Sat, = Apr 27, 2019 at 5:14 PM Joel M. Halpern <jmh@joelhalpern.com> wrote:
Actually Robert, a number of people have suggest= ed on the 6man lsit that
the overloading of IPv6 addresses to also represent functions to be
performed is a problem.=C2=A0 And have put proposals on the table to get ou= t
of the problem rather than just pretending is a good idea.

Yours,
Joel
--000000000000a2976f058784a364-- From nobody Sat Apr 27 08:24:38 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83B0A1202A1; Sat, 27 Apr 2019 08:24:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KWn-1iI2q5AU; Sat, 27 Apr 2019 08:24:28 -0700 (PDT) Received: from mta7.iomartmail.com (mta7.iomartmail.com [62.128.193.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 68C2E1201D1; Sat, 27 Apr 2019 08:24:28 -0700 (PDT) Received: from vs2.iomartmail.com (vs2.iomartmail.com [10.12.10.123]) by mta7.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RFOPqO031449; Sat, 27 Apr 2019 16:24:25 +0100 Received: from vs2.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E395822044; Sat, 27 Apr 2019 16:24:24 +0100 (BST) Received: from asmtp1.iomartmail.com (unknown [10.12.10.248]) by vs2.iomartmail.com (Postfix) with ESMTPS id CCFDA22042; Sat, 27 Apr 2019 16:24:24 +0100 (BST) Received: from LAPTOPK7AS653V ([87.112.228.68]) (authenticated bits=0) by asmtp1.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RFON1o026214 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 27 Apr 2019 16:24:23 +0100 Reply-To: From: "Adrian Farrel" To: "'Robert Raszuk'" Cc: "'Robert Raszuk'" , "'SPRING WG'" , References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> <006c01d4fd0a$7c868d00$7593a700$@olddog.co.uk> In-Reply-To: Date: Sat, 27 Apr 2019 16:24:22 +0100 Organization: Old Dog Consulting Message-ID: <008101d4fd0d$4ae65c00$e0b31400$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0082_01D4FD15.ACADD140" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQKiuZZ85wkSAmxndBno69hsKyy+2gKnS9woAZ3mRgkCHHBxEQFcSi05Aqs3YRSkYV0q0A== Content-Language: en-gb X-Originating-IP: 87.112.228.68 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-24578.000 X-TM-AS-Result: No--25.158-10.0-31-10 X-imss-scan-details: No--25.158-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-24578.000 X-TMASE-Result: 10--25.158000-10.000000 X-TMASE-MatchedRID: /77LoUQXvQ/xIbpQ8BhdbLxk3OaETqHe9NYqzb2oOWuen0qBdy7fjPvt 4ENurW24GVaP8xcwMrcXIJWO/t2Wjs5/oVSv8cmRb8JTZf0kEztA8JZETQujwkjy8BQTPSF8JTv jccXd8nUGPnbKhPHLzb48sxXcFNXVjQyf9QArOhS3UCG/IQp2PpCobo6XQuiXDYbe/PyX8gQzBH KsDHLonxl07H6MCfrhuvKI6EW3Dmk16m0rYf5ReTPDkSOzeDWW2R8ArC+vPzHkMnUVL5d0E5Nve yvWDtt2tJpHKHYUE3IZ6hyNJptMCL52zSPzPvrjKWuiyZLRI4C8sFdsyxklvoYQveKV5AcT/SV8 5SJBuf8RKKrVCc89GXIiA6DJGFiqOaS9U7Z42f7YAFiR6ssLCN9WrDP4LKdpGA7uwIZNHQ1cX89 dDrF4+W4Kqb0ahB2Jf6WytOayZdvWV8MKb34RlVgowyUWHgGdh+w9Wz/xXDoR8rMICe0qkPMxs+ ucp3ZM7gzcfk5O5gtiXQjTxUn166dwsJe6fN2LEgwM8US/pTE5LRtPnepd1Qwv1ZvdCH+FmPMvF iO40LCNIndKSIasU9h2Ct38hdsBxldSKOGXaXw00dkxYNMRt9VYleRFiu07myiLZetSf8mVHVxP 1hp9BUpZ1N/CwmPL0KkIUsNMdlTiRhduhvElsqX8y2tPBLhQgyNt5O1YxdWeSz8p+7DgFQ8Vwb6 DUG+SDAXGXKPYJil09r6Q5eX4Zg== X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:24:36 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0082_01D4FD15.ACADD140 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Robert,=20 =20 Coincidence is a mighty thing, but attributing coincidence to planning = is the slippery slope you spoke of. =20 Drawing conclusions about an =E2=80=9Coverall strategy=E2=80=9D that I = might be part of is potentially offensive. Should I be offended? =20 Let=E2=80=99s just do the work and stop second guessing anything shall = we? It is so much easier to do good technical work than it is to guess = motivations and assign them to people. =20 Thanks, Adrian =20 From: Robert Raszuk =20 Sent: 27 April 2019 16:15 To: adrian@olddog.co.uk Cc: Robert Raszuk ; SPRING WG ; = spring-chairs@ietf.org Subject: Re: [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming =20 Hey Adrian, =20 > Well for one let's observe that interface can be both physical and = logical > entity and as such especially being a logical one can be tight with a=20 > service switching vector in any network element. So even based on all > IPv6 related RFCs you have quoted it does not violate any.=20 =20 This is certainly one way around the concern. If we define = =E2=80=9Cinterfaces to functions=E2=80=9D (such as an interface to a = VRF) then we may be done. That would be relatively easy to achieve with = a simple section in the network programming draft. =20 So it seems we have a solution to your concern. If WG decides to = augement the WG doc with such defintion it seems to be done deal.=20 =20 Just to repeat (since it has apparently been repeatedly missed in = reading my emails on this topic, and was even the cause of some heat in = a face-to-face conversation I had in Prague) I am not seeking to block = anything. What I want to do is get everything aligned. I want to be sure = that we have agreement early rather than having a = =E2=80=9Cfight=E2=80=9D late in the day when pressures will be more = severe. I simply don=E2=80=99t understand any reluctance to bring this = discussion into the open and make sure we understand how the = architectures and terminology line up. =20 Well as an observer I see the interesting coincidence of such comments = popping up in the same time as alternative proposals to define yet one = more new mapping scheme of IDs to service functions and to not embed = them as part of 128 bits. So the conclusions are coming out pretty = automatically about overall strategy :)=20 =20 Cheers, R. ------=_NextPart_000_0082_01D4FD15.ACADD140 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Robert, =

 

Coincidence = is a mighty thing, but attributing coincidence to planning is the = slippery slope you spoke of.

 

Drawing = conclusions about an =E2=80=9Coverall strategy=E2=80=9D that I might be = part of is potentially offensive. Should I be = offended?

 

Let=E2=80=99s just do the work and = stop second guessing anything shall we? It is so much easier to do good = technical work than it is to guess motivations and assign them to = people.

 

Thanks,

Adrian

 

From: Robert Raszuk <robert@raszuk.net>
Sent: = 27 April 2019 16:15
To: adrian@olddog.co.uk
Cc: = Robert Raszuk <rraszuk@gmail.com>; SPRING WG = <spring@ietf.org>; spring-chairs@ietf.org
Subject: Re: = [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming

 

Hey Adrian,

 

> Well for = one let's observe that interface can be both physical and = logical

> entity = and as such especially being a logical one can be tight with a =

> service = switching vector in any network element. So even based on = all

> IPv6 = related RFCs you have quoted it does not violate = any. 

 

<= p class=3Dgmail-m8545283804189156453msolistparagraph>This is certainly = one way around the concern. If we define =E2=80=9Cinterfaces to = functions=E2=80=9D (such as an interface to a VRF) then we may be done. = That would be relatively easy to achieve with a simple section in the = network programming = draft.

 

So it seems we have a solution to your concern. If WG = decides to augement the WG doc with such defintion it seems to be done = deal. 

 

Just to repeat (since = it has apparently been repeatedly missed in reading my emails on this = topic, and was even the cause of some heat in a face-to-face = conversation I had in Prague) I am not seeking to block anything. What I = want to do is get everything aligned. I want to be sure that we have = agreement early rather than having a =E2=80=9Cfight=E2=80=9D late in the = day when pressures will be more severe.

 I simply = don=E2=80=99t understand any reluctance to bring this discussion into = the open and make sure we understand how the architectures and = terminology line up.

 

Well as an observer I see the interesting coincidence = of such comments popping up in the same time as alternative proposals to = define yet one more new mapping scheme of IDs to service functions and = to not embed them as part of 128 bits. So the conclusions are coming out = pretty automatically about overall strategy = :) 

 

Cheers,
R.

------=_NextPart_000_0082_01D4FD15.ACADD140-- From nobody Sat Apr 27 08:25:19 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DD9B412028E; Sat, 27 Apr 2019 08:25:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b-vySNBgtDL5; Sat, 27 Apr 2019 08:25:12 -0700 (PDT) Received: from mta5.iomartmail.com (mta5.iomartmail.com [62.128.193.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 410841201F2; Sat, 27 Apr 2019 08:25:07 -0700 (PDT) Received: from vs3.iomartmail.com (vs3.iomartmail.com [10.12.10.124]) by mta5.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RFP4hq024387; Sat, 27 Apr 2019 16:25:04 +0100 Received: from vs3.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 02F732203A; Sat, 27 Apr 2019 16:25:04 +0100 (BST) Received: from asmtp3.iomartmail.com (unknown [10.12.10.224]) by vs3.iomartmail.com (Postfix) with ESMTPS id E160922032; Sat, 27 Apr 2019 16:25:03 +0100 (BST) Received: from LAPTOPK7AS653V ([87.112.228.68]) (authenticated bits=0) by asmtp3.iomartmail.com (8.14.4/8.14.4) with ESMTP id x3RFP25N005833 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 27 Apr 2019 16:25:03 +0100 Reply-To: From: "Adrian Farrel" To: "'Robert Raszuk'" Cc: "'Robert Raszuk'" , "'SPRING WG'" , References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> <006c01d4fd0a$7c868d00$7593a700$@olddog.co.uk> In-Reply-To: Date: Sat, 27 Apr 2019 16:25:01 +0100 Organization: Old Dog Consulting Message-ID: <008601d4fd0d$62444330$26ccc990$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0087_01D4FD15.C408AB30" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQKiuZZ85wkSAmxndBno69hsKyy+2gKnS9woAZ3mRgkCHHBxEQFcSi05Aqs3YRSkYV0q0A== Content-Language: en-gb X-Originating-IP: 87.112.228.68 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-24578.000 X-TM-AS-Result: No--25.158-10.0-31-10 X-imss-scan-details: No--25.158-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-24578.000 X-TMASE-Result: 10--25.158000-10.000000 X-TMASE-MatchedRID: /77LoUQXvQ/xIbpQ8BhdbLxk3OaETqHe9NYqzb2oOWuen0qBdy7fjPvt 4ENurW24GVaP8xcwMrcXIJWO/t2Wjs5/oVSv8cmRb8JTZf0kEztA8JZETQujwkjy8BQTPSF8JTv jccXd8nUGPnbKhPHLzb48sxXcFNXVjQyf9QArOhS3UCG/IQp2PpCobo6XQuiXDYbe/PyX8gQzBH KsDHLonxl07H6MCfrhuvKI6EW3Dmk16m0rYf5ReTPDkSOzeDWW2R8ArC+vPzHkMnUVL5d0E5Nve yvWDtt2tJpHKHYUE3IZ6hyNJptMCL52zSPzPvrjKWuiyZLRI4C8sFdsyxklvoYQveKV5AcT/SV8 5SJBuf8RKKrVCc89GXIiA6DJGFiqOaS9U7Z42f7YAFiR6ssLCN9WrDP4LKdpGA7uwIZNHQ1cX89 dDrF4+W4Kqb0ahB2Jf6WytOayZdvWV8MKb34RlVgowyUWHgGdh+w9Wz/xXDoR8rMICe0qkPMxs+ ucp3ZM7gzcfk5O5gtiXQjTxUn166dwsJe6fN2LEgwM8US/pTE5LRtPnepd1Qwv1ZvdCH+FmPMvF iO40LCNIndKSIasU9h2Ct38hdsBxldSKOGXaXw00dkxYNMRt9VYleRFiu07myiLZetSf8mVHVxP 1hp9BUpZ1N/CwmPL0KkIUsNMdlTiRhduhvElsqX8y2tPBLhQgyNt5O1YxdWeSz8p+7DgFQ8Vwb6 DUG+SDAXGXKPYJil09r6Q5eX4Zg== X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:25:17 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0087_01D4FD15.C408AB30 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Robert,=20 =20 Coincidence is a mighty thing, but attributing coincidence to planning = is the slippery slope you spoke of. =20 Drawing conclusions about an =E2=80=9Coverall strategy=E2=80=9D that I = might be part of is potentially offensive. Should I be offended? =20 Let=E2=80=99s just do the work and stop second guessing anything shall = we? It is so much easier to do good technical work than it is to guess = motivations and assign them to people. =20 Thanks, Adrian =20 From: Robert Raszuk =20 Sent: 27 April 2019 16:15 To: adrian@olddog.co.uk Cc: Robert Raszuk ; SPRING WG ; = spring-chairs@ietf.org Subject: Re: [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming =20 Hey Adrian, =20 > Well for one let's observe that interface can be both physical and = logical > entity and as such especially being a logical one can be tight with a=20 > service switching vector in any network element. So even based on all > IPv6 related RFCs you have quoted it does not violate any.=20 =20 This is certainly one way around the concern. If we define = =E2=80=9Cinterfaces to functions=E2=80=9D (such as an interface to a = VRF) then we may be done. That would be relatively easy to achieve with = a simple section in the network programming draft. =20 So it seems we have a solution to your concern. If WG decides to = augement the WG doc with such defintion it seems to be done deal.=20 =20 Just to repeat (since it has apparently been repeatedly missed in = reading my emails on this topic, and was even the cause of some heat in = a face-to-face conversation I had in Prague) I am not seeking to block = anything. What I want to do is get everything aligned. I want to be sure = that we have agreement early rather than having a = =E2=80=9Cfight=E2=80=9D late in the day when pressures will be more = severe. I simply don=E2=80=99t understand any reluctance to bring this = discussion into the open and make sure we understand how the = architectures and terminology line up. =20 Well as an observer I see the interesting coincidence of such comments = popping up in the same time as alternative proposals to define yet one = more new mapping scheme of IDs to service functions and to not embed = them as part of 128 bits. So the conclusions are coming out pretty = automatically about overall strategy :)=20 =20 Cheers, R. ------=_NextPart_000_0087_01D4FD15.C408AB30 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Robert, =

 

Coincidence = is a mighty thing, but attributing coincidence to planning is the = slippery slope you spoke of.

 

Drawing = conclusions about an =E2=80=9Coverall strategy=E2=80=9D that I might be = part of is potentially offensive. Should I be = offended?

 

Let=E2=80=99s just do the work and = stop second guessing anything shall we? It is so much easier to do good = technical work than it is to guess motivations and assign them to = people.

 

Thanks,

Adrian

 

From: Robert Raszuk <robert@raszuk.net>
Sent: = 27 April 2019 16:15
To: adrian@olddog.co.uk
Cc: = Robert Raszuk <rraszuk@gmail.com>; SPRING WG = <spring@ietf.org>; spring-chairs@ietf.org
Subject: Re: = [spring] Working Group Adoption Call for = draft-filsfils-spring-srv6-network-programming

 

Hey Adrian,

 

> Well for = one let's observe that interface can be both physical and = logical

> entity = and as such especially being a logical one can be tight with a =

> service = switching vector in any network element. So even based on = all

> IPv6 = related RFCs you have quoted it does not violate = any. 

 

<= p class=3Dgmail-m8545283804189156453msolistparagraph>This is certainly = one way around the concern. If we define =E2=80=9Cinterfaces to = functions=E2=80=9D (such as an interface to a VRF) then we may be done. = That would be relatively easy to achieve with a simple section in the = network programming = draft.

 

So it seems we have a solution to your concern. If WG = decides to augement the WG doc with such defintion it seems to be done = deal. 

 

Just to repeat (since = it has apparently been repeatedly missed in reading my emails on this = topic, and was even the cause of some heat in a face-to-face = conversation I had in Prague) I am not seeking to block anything. What I = want to do is get everything aligned. I want to be sure that we have = agreement early rather than having a =E2=80=9Cfight=E2=80=9D late in the = day when pressures will be more severe.

 I simply = don=E2=80=99t understand any reluctance to bring this discussion into = the open and make sure we understand how the architectures and = terminology line up.

 

Well as an observer I see the interesting coincidence = of such comments popping up in the same time as alternative proposals to = define yet one more new mapping scheme of IDs to service functions and = to not embed them as part of 128 bits. So the conclusions are coming out = pretty automatically about overall strategy = :) 

 

Cheers,
R.

------=_NextPart_000_0087_01D4FD15.C408AB30-- From nobody Sat Apr 27 08:27:05 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA3CF12015B for ; Sat, 27 Apr 2019 08:27:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SYiRVr21M9vv for ; Sat, 27 Apr 2019 08:27:03 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7294512014B for ; Sat, 27 Apr 2019 08:27:03 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 44rvsz2hcxzVfr0; Sat, 27 Apr 2019 08:27:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1556378823; bh=9L816FMcumOcs5on5+TPPdvLEOSLiCBx3ysxs5G/18E=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Ft/8849SdYmo40BtwUcs9JRJfHaND/yP6WRRLMJFg+qQkvfaVZfZtuBQYX9Vz/o5/ astgNAZyGq/V93a0EhAwPV5KYbTl5d0NZA63DVS5p2MAag4OBmyr7UHKql5xnmCHfD C6L+S4gVDwZ2HYZvqTUhWXE79B5kR7amFRuWcrbE= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 44rvsy6RpgzVfqh; Sat, 27 Apr 2019 08:27:02 -0700 (PDT) To: Robert Raszuk Cc: SPRING WG References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> From: "Joel M. Halpern" Message-ID: Date: Sat, 27 Apr 2019 11:27:02 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2019 15:27:05 -0000 I think you have mixed two things. You ahve the ability to abuse the standards any way you like in your own home (assuming you program your own devices). The IETF is not the protocol police. Operators have the ability to do whatever they want with their networks, and the IETF has no right or ability to stop them. (I consider Terastream an example of this.) However, when someone asks the IETF to standardize a behavior, that is a different game. The IETF does have a right to question whether a given use in a standard is appropriate, correct, consistent, or even whether it is a good idea. Yours, Joel On 4/27/19 11:23 AM, Robert Raszuk wrote: > Joel, > > Imagine I get IPv4 /28 block or IPv6 /64 block of address space. > > Isn't it my own business how I map and to what I map my non globally > routable last bits of such address ? > > Does anyone care - specifically would IETF have right to care - if one > /32 or /128 address is used in my house to turn on the AC or coffee > machine and some other to turn it off ? > > Those would be my embedded functions in IPv4 or IPv6 addresses. Of > course there is tons of other ways to achieve such functions but those > are just examples for illustration purposes. > > Cheers, > R. > > > On Sat, Apr 27, 2019 at 5:14 PM Joel M. Halpern > wrote: > > Actually Robert, a number of people have suggested on the 6man lsit > that > the overloading of IPv6 addresses to also represent functions to be > performed is a problem.  And have put proposals on the table to get out > of the problem rather than just pretending is a good idea. > > Yours, > Joel > From nobody Sat Apr 27 11:31:05 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FB911200FA; Sat, 27 Apr 2019 11:31:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.339 X-Spam-Level: X-Spam-Status: No, score=-1.339 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, KHOP_DYNAMIC=1.363, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i6DPzOGM2ZqB; Sat, 27 Apr 2019 11:31:00 -0700 (PDT) Received: from mx0b-00273201.pphosted.com (mx0b-00273201.pphosted.com [67.231.152.164]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B7D5120088; Sat, 27 Apr 2019 11:31:00 -0700 (PDT) Received: from pps.filterd (m0108160.ppops.net [127.0.0.1]) by mx0b-00273201.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3RIONR1023077; Sat, 27 Apr 2019 11:30:57 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=juniper.net; h=from : to : cc : subject : date : message-id : references : in-reply-to : content-type : content-transfer-encoding : mime-version; s=PPS1017; bh=USPef6CWFWUntN0pzGYW6a6JbVWSw3DtL42bfuyMxmI=; b=zxQ0N8ziZQEHWsvJExjxK7fu8p9yry79iT/SUL6eDOFPPNDXeQIn8CzN969mrVeCZR1W QoCIJHdm/pOURtH52IRPXbQRM+DQjndYE3Xk5rLT03FrPAdeY9aOBMO1P0gVYEFMEdBB gxeOKv7qgUFF4e6R3QIvN2vxtGG/Xo2WGK/DJPrTJGY0A9Ovt7Hesbwus1ePlhn88dqz XtX6w/LO9HHCiixM9mHcTun9FzEJga/pWEeB420Tq776KSfSb/8NKBHIIzu3fxO6Wfid 7hMpJTMqhFjiGJyXkfKb738Cz4T7k22LT/jM0RqOjYrGuDdsf5kihrg7g2yPI+VIwK/k uQ== Received: from nam03-co1-obe.outbound.protection.outlook.com (mail-co1nam03lp2052.outbound.protection.outlook.com [104.47.40.52]) by mx0b-00273201.pphosted.com with ESMTP id 2s4n0g8cq1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Sat, 27 Apr 2019 11:30:57 -0700 Received: from BYAPR05MB4245.namprd05.prod.outlook.com (20.176.252.26) by BYAPR05MB4024.namprd05.prod.outlook.com (52.135.199.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1835.9; Sat, 27 Apr 2019 18:30:53 +0000 Received: from BYAPR05MB4245.namprd05.prod.outlook.com ([fe80::d8ca:22cd:52b:d163]) by BYAPR05MB4245.namprd05.prod.outlook.com ([fe80::d8ca:22cd:52b:d163%6]) with mapi id 15.20.1835.010; Sat, 27 Apr 2019 18:30:53 +0000 From: Ron Bonica To: "Joel M. Halpern" , Robert Raszuk , Adrian Farrel CC: SPRING WG , "spring-chairs@ietf.org" Thread-Topic: [spring] Working Group Adoption Call for draft-filsfils-spring-srv6-network-programming Thread-Index: AdTZy78VsE+8X4JtQm2GPnG5Q8GtmQf6dNOwAMnxoYAACrqVgAAA6MGAAAbbfmA= Content-Class: Date: Sat, 27 Apr 2019 18:30:53 +0000 Message-ID: References: <22596_1552502971_5C8950BB_22596_34_1_53C29892C857584299CBF5D05346208A48A18771@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17228_1556107963_5CC052BB_17228_259_1_53C29892C857584299CBF5D05346208A48A90703@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <003c01d4fcdd$59e6b1d0$0db41570$@olddog.co.uk> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.1.100.23 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=True; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; 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On Tue, Apr 23, 2019 at 3:49 PM <bruno.decraene@orange.com> wrote:

Hi authors, SPRING W= G,

=C2=A0

= This document has 6 authors and 22 contributors. As expected the call for IPR has been long and difficult.

= Please find below the current status. We got an answer from all authors and 19 out of 22 contributors.

= Unless there is a motivated objection, we=E2=80=99ll make an exception from the 3 missing contributors who are not reachable. N= ote that this does not change their obligation to accept all IETF rules of = process ht= tps://www6.ietf.org/about/note-well.html

= =C2=A0

Robert Ra= szuk

Y<= u>

21/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Daniel Be= rnier

Y<= u>

21/03/2019

<= span style=3D"font-size:12pt;color:black">Author

John Ledd= y

Y<= u>

13/03/2019

<= span style=3D"font-size:12pt;color:black">Author

<= span style=3D"font-size:12pt;color:black">Satoru Matsushima

Y<= u>

15/03/2019

<= span style=3D"font-size:12pt;color:black">Author

Daniel Vo= yer

y<= u>

21/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Dirk Stei= nberg

Y<= u>

10/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Bruno Decraene

Y<= u>

03/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Bart Peirens=

Y<= u>

25/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

David Leb= run

Y<= u>

29/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Stefano Salsano=

Y<= u>

04/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Gaurav Naik

Y<= u>

04/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Ahmed Bas= handy

Y<= u>

19/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

<= span style=3D"font-size:12pt;color:black">Linzhenbin (H)

Y<= u>

14/03/2019

<= span style=3D"font-size:12pt;color:black">Author

<= span style=3D"font-size:12pt;color:black">Arthi Ayyangar

Y<= u>

10/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

<= span style=3D"font-size:12pt;color:black">Satish Mynam

=C2=A0=

<= span style=3D"font-size:12pt;color:black">Contributor

Wim Henderickx=

Y<= u>

18/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

<= span style=3D"font-size:12pt;color:black">Shaowen Ma

=C2=A0=

<= span style=3D"font-size:12pt;color:black">Contributor

Prem Jonnalagadda

=C2=A0=

<= span style=3D"font-size:12pt;color:black">Contributor

<= span style=3D"font-size:12pt;color:black">Milad Sharif

Y<= u>

10/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Hani Elma= lky

Y<= u>

10/04/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Zafar Ali=

Y<= u>

13/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Ahmed Abdelsalam=

Y<= u>

15/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Francois Clad

Y<= u>

15/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Kamran Raza

Y<= u>

27/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Darren Dukes

Y<= u>

18/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Patrice Brissete

Y<= u>

15/03/2019

<= span style=3D"font-size:12pt;color:black">Contributor

Clarence<= u>

Y<= u>

14/03/2019

<= span style=3D"font-size:12pt;color:black">Author

Pablo<= /u>

Y<= u>

15/03/2019

<= span style=3D"font-size:12pt;color:black">Author

= =C2=A0

= =C2=A0

= =C2=A0

= Regards,

= --Rob, Bruno

=

= =C2=A0

From: spring [mailto:spring-bounces@i= etf.org] On Behalf Of bruno.de= craene@orange.com
Sent: Wednesday, March 13, 2019 7:50 PM
To: SPRING WG
Cc: draft-filsfils-spring-srv6-network-programming= @ietf.org
Subject: [spring] IPR Poll for draft-filsfils-spring-srv6-network-pr= ogramming

=C2=A0 

Hi authors, SPRING W=
G,
=C2=A0=

In parallel to the c=
all for adoption for draft-filsfils-spring-srv6-network-programming (1), we=
 would like to poll for IPR.
=C2=A0=

If you are aware of =
IPR that applies to draft-filsfils-spring-srv6-network-programming please r=
espond to this email.
If you are aware of =
IPR, please indicate whether it has been disclosed in accordance with IETF =
IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more details).<=
/u>
=C2=A0=

If you are an *autho=
r or contributor* please respond to this email regardless of whether or not=
 you're aware of any IPR.
If you are not an au=
thor or contributor, please explicitly respond only if you are aware of IPR=
 that has not yet been disclosed.
=C2=A0=

This document will n=
ot advance into the working group until IPR confirmations have been receive=
d from all authors and contributors.
=C2=A0=

Thank you,=

=C2=A0=

(1)=C2=A0 https://tool=
s.ietf.org/html/draft-filsfils-spring-srv6-network-programming-07
=C2=A0=

=C2=A0=

--Bruno & Rob.

=C2=A0 

_________________________________________=
___________________________________________________________________________=
_____
=C2=A0
Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c
pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler
a l'expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d'=
alteration,
Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.
=C2=A0
This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;=

they should not be distributed, used or c=
opied 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 l=
iable for messages that have been modified, changed or falsified.=

Thank you.
______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
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spring mailing list
spring@ietf.org https://www.ietf.org/mailman/listinfo/spring

And what happens -=C2=A0

  • When there is an SRH and Segments Left is not eq= ual to 0 ?=C2=A0


On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica <rbonica@juniper.net> wrote:

= Hi Jim,

= =C2=A0

= Thanks for asking this insightful question. The answer depends on the SID t= ype.

= =C2=A0

= Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed = only in the following conditions:

= =C2=A0

  • When there is no SRH
  • When there is an SRH and Segments Left is eq= ual to 0

= =C2=A0

= Such SIDs should be encoded in the Destination Options header that immediat= ely precedes the upper-layer header. This is because the Destination Option= s header that immediately precedes the upper-layer header is only processed when:

= =C2=A0

  • When there is no SRH
  • When there is an SRH and Segments Left is eq= ual to 0

= =C2=A0

= Moreover, Destination options are of variable length. So, each SID can be a= s long or short as it needs to be. One SID type can be long while another i= s short and neither needs to be the same length as SIDs that are encoded in the IPv6 Routing header.<= /span>

= =C2=A0

= The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an e= xample of such an encoding. It serves the same purpose as many of the SID d= efined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, END.DX6, END.DT4, END.DT6). As more service SIDs of this t= ype are identified, more destination options will be defined.=

= =C2=A0

= Other Service SIDs can be processed when an SRH is present and Segments Lef= t is greater than zero. Ideally, these SIDs should be encoded in the Destin= ation Options Header that immediately precedes the Routing header. This is because the Destination Options Header that im= mediately precedes the Routing header is processed by every segment endpoin= t. Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is= not the only one.

= =C2=A0

= Another possibility is to encode these SIDs the Destination Options header = that immediately precedes the upper-layer header and required Service Funct= ion Instances that support these SIDs to look ahead.

= =C2=A0

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: James N Guichard <james.n.guichard@huawei.com<= /a>>
Sent: Thursday, April 18, 2019 5:57 PM
To: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>; James N Guichard <= ;james.n.g= uichard@huawei.com>
Subject: RE: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Ron,<= u>

=C2=A0

I am wondering = about how do you plan to handle service SIDs (or any SID with embedded func= tions) at intermediate nodes; draft-bonica-6man-vpn-dest-opt seems to only = handle the case where the endpoint will process the destination option:

=C2=A0

Section 4 says: =E2=80=9CIt MUST NOT appear in a = Hop-by-hop Options header and SHOULD NOT appear in a Destination Options he= ader that precedes a Routing header=E2=80=9D.

=C2=A0

If = you relax the latter and encode the SID in a destination option preceding t= he CRH (or SRH) then wouldn=E2=80=99t every node in the segment-list have t= o process the SID and figure out whether it is a local SID or not? That would seem to be overly complex given you could just enco= de the SID in the CRH (or SRH) and only the node where said SID is exposed = would process it.

= =C2=A0

Tha= nks!

= =C2=A0

Jim=

=C2=A0

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: RE: [spring] IPv6-compressed-routing-header-crh

=C2=A0

= Robert,

= =C2=A0

= The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the next segment.

= =C2=A0

= Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.=

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0Ron

= =C2=A0

=C2=A0

Juniper Internal

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRIN= G WG <spring@ietf.o= rg>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Ron,

=C2=A0

I must observe that your analysis is incorrect.=C2= =A0

=C2=A0

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV.=C2=A0

=C2=A0

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options.=C2=A0

=C2=A0

That debate is still I think open.=C2=A0

=C2=A0

Thx,

R.

=C2=A0

=C2=A0

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net= > wrote:

= Gyan,

= =C2=A0

= Let=E2=80=99s think about how a network operator might choose a SID size=E2= =80=A6.

= =C2=A0

= Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructure links.

= =C2=A0

= The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be reused).

= =C2=A0

= The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be reused from one node to another.

= =C2=A0

= So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth.

= =C2=A0

= Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer.=C2=A0 This network would need 30,200 SIDs. This would fit in 16 bits.<= /u>

= =C2=A0

= A *really big* network might require more than 32,000 SIDs. So, we s= upport a 32-bit SID...

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Ron

= =C2=A0

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

=C2=A0

I agree to make the SID align on word boundaries but= I am thinking the software should have hardware independence if at all pos= sible.

=C2=A0

I think 32 bit is a reasonable size.

=C2=A0

=C2=A0

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS &= ; IPv6 Expert

Mobile =E2=80=93=C2=A0202-734-1000

=C2=A0

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

= Hi Robert,

= =C2=A0

= In order to make the CRH ASIC-friendly, we have the following constraints:<= /span>

= =C2=A0

  • Support only a small handful of SID lengths<= /span>
  • If at all possible, make them align on word = boundaries

= =C2=A0

= Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that would be beneficial?

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Tom,

=C2=A0

I already suggested this on March 30th ...=C2=A0<= /u>

=C2=A0

"PS. But if you choose to go ahead with CRH I would highly advise t= o make your CRH SID a variable length. "

=C2=A0

No feed= back/response was received from authors.=C2=A0

=C2=A0

Thx, R.

=C2=A0

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ......org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

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ipv6@ietf.org
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--0000000000000bf5fd0586dd1a12-- From nobody Fri Apr 19 03:44:11 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05751120130 for ; Fri, 19 Apr 2019 03:44:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.01 X-Spam-Level: X-Spam-Status: No, score=-0.01 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XkQlyBa_gSev for ; Fri, 19 Apr 2019 03:43:57 -0700 (PDT) Received: from mail-qt1-x844.google.com (mail-qt1-x844.google.com [IPv6:2607:f8b0:4864:20::844]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A90A8120123 for ; Fri, 19 Apr 2019 03:43:56 -0700 (PDT) Received: by mail-qt1-x844.google.com with SMTP id z17so5108980qts.13 for ; Fri, 19 Apr 2019 03:43:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YP3moLOYu8YJg/+V7AUNrKaeBTJf9MPBIMPU9upUwIo=; b=fUvpXscN7b7OcGImr61HM5PdSAYd39wCXu60AzeoXgJGqUriluuxYSa664BJI/pE5n cdUQtXvEqnzgQKKIMIJS40qmNtl1AosWGt9YELUxeKigsoPrtw8+UwEDx6pmnCqUYJzi HOpT9kcFh7fzQa9yyneQcb5a7Ufqz6y8i6OLbgelkiz2gZqB5G8EL3Hje+zyL+PRBd9R GWi71+xNoTgDbPE9/e5DzZLFpvTAKUTt0pgkEQKwW1bdfOZIq9LtWaRg0+RakqUir281 auePKFECIv+rY7+6mu8kxjXjYUpnQZqutX8XUj3TVV6HGRYX9YFxIqtvTQ90TsMqUXLA dkzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YP3moLOYu8YJg/+V7AUNrKaeBTJf9MPBIMPU9upUwIo=; b=N4QnGb+nnhTYkklYEQFhdFlT52MuUm2wcsAJwlfcjuR7Jw9P/ziG2a8YkbiixmjwJM TGmSuUI5a+Yz6h5mpZNMT3FkF15GLwrTvFzFxYEP5nTZEargP6rY3KYyVOHdILVLEXhn aXz7WnYMAdxfntzM/QtLB2OOyfrhK8JTQUWOjGgdJeN07hbIlB0o7TRiP66gfVfoALpQ AN2xJqVL6nvO/mKkoNJ9wKgP34ph9NonJc9XiqZFX8d4CryKLCH8BC2MfR1oIUNREh4o eCFninErH9zKSnoCI7DDNU/VQsXgmbPq072E1cNFKYtpEhxBCARXRE2rTpqP7CBWzkEG oBYg== X-Gm-Message-State: APjAAAXKIcy35IhKotrkF/bpNIXMqY4U36f4RyJOKeamyaSQCOqnxgTH nPeCzg70wgfqc8fK5gknm2+kUC0XsC5ByeUvGVJqeA== X-Google-Smtp-Source: APXvYqwGqVO206RaoHYt6vGUy06ZKbkqPV3q1b8ygsRRrcLyZ8u5Ohsb+3i/biR01xhmEh7zP1c2UhyIhbpwqzSkjcg= X-Received: by 2002:a0c:949c:: with SMTP id j28mr2854048qvj.18.1555670635586; Fri, 19 Apr 2019 03:43:55 -0700 (PDT) MIME-Version: 1.0 References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> In-Reply-To: From: Robert Raszuk Date: Fri, 19 Apr 2019 12:43:41 +0200 Message-ID: To: Ron Bonica Cc: James N Guichard , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Type: multipart/alternative; boundary="0000000000009f3e650586dfcbd4" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2019 10:44:02 -0000 --0000000000009f3e650586dfcbd4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Specifically how do you associate different service functions encoded in Dest. Options with specific segments for selective execution ? Hint: Execution of all encoded and carried from src or edge of the network service instructions in destinations options at each SR node is not an option. Do you now duplicate each SID into Dest Options to be able to choose which service is executed in which of the entire path's mid point ? Many thx, Robert. On Fri, Apr 19, 2019 at 9:30 AM Robert Raszuk wrote: > > And what happens - > > > - When there is an SRH and Segments Left is *not* equal to 0 ? > > > > On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica wrote: > >> Hi Jim, >> >> >> >> Thanks for asking this insightful question. The answer depends on the SI= D >> type. >> >> >> >> Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are >> processed only in the following conditions: >> >> >> >> - When there is no SRH >> - When there is an SRH and Segments Left is equal to 0 >> >> >> >> Such SIDs should be encoded in the Destination Options header that >> immediately precedes the upper-layer header. This is because the >> Destination Options header that immediately precedes the upper-layer hea= der >> is only processed when: >> >> >> >> - When there is no SRH >> - When there is an SRH and Segments Left is equal to 0 >> >> >> >> Moreover, Destination options are of variable length. So, each SID can b= e >> as long or short as it needs to be. One SID type can be long while anoth= er >> is short and neither needs to be the same length as SIDs that are encode= d >> in the IPv6 Routing header. >> >> >> >> The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is a= n >> example of such an encoding. It serves the same purpose as many of the S= ID >> defined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4= , >> END.DX6, END.DT4, END.DT6). As more service SIDs of this type are >> identified, more destination options will be defined. >> >> >> >> Other Service SIDs can be processed when an SRH is present and Segments >> Left is greater than zero. Ideally, these SIDs should be encoded in the >> Destination Options Header that immediately precedes the Routing header. >> This is because the Destination Options Header that immediately precedes >> the Routing header is processed by every segment endpoint. >> Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is >> not the only one. >> >> >> >> Another possibility is to encode these SIDs the Destination Options >> header that immediately precedes the upper-layer header and required >> Service Function Instances that support these SIDs to look ahead. >> >> >> >> >> >> >> Ron >> >> >> >> >> >> >> >> Juniper Internal >> >> *From:* James N Guichard >> *Sent:* Thursday, April 18, 2019 5:57 PM >> *To:* Ron Bonica ; Robert Raszuk >> *Cc:* SPRING WG ; ipv6@ietf.org; Dino Farinacci < >> farinacci@gmail.com>; lisp@ietf.org list ; James N >> Guichard >> *Subject:* RE: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Hi Ron, >> >> >> >> I am wondering about how do you plan to handle service SIDs (or any SID >> with embedded functions) at intermediate nodes; >> draft-bonica-6man-vpn-dest-opt seems to only handle the case where the >> endpoint will process the destination option: >> >> >> >> Section 4 says: =E2=80=9CIt MUST NOT appear in a Hop-by-hop Options head= er and >> SHOULD NOT appear in a Destination Options header that precedes a Routin= g >> header=E2=80=9D. >> >> >> >> If you relax the latter and encode the SID in a destination option >> preceding the CRH (or SRH) then wouldn=E2=80=99t every node in the segme= nt-list >> have to process the SID and figure out whether it is a local SID or not? >> That would seem to be overly complex given you could just encode the SID= in >> the CRH (or SRH) and only the node where said SID is exposed would proce= ss >> it. >> >> >> >> Thanks! >> >> >> >> Jim >> >> >> >> *From:* ipv6 [mailto:ipv6-bounces@ietf.org ] *On >> Behalf Of *Ron Bonica >> *Sent:* Thursday, April 18, 2019 4:30 PM >> *To:* Robert Raszuk >> *Cc:* SPRING WG ; ipv6@ietf.org; Dino Farinacci < >> farinacci@gmail.com>; lisp@ietf.org list >> *Subject:* RE: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Robert, >> >> >> >> The Compressed Routing Header (CRH) has exactly one function. That is to >> route a packet for segment to segment along an SR path. Therefore, SIDs >> contained by the CRH have only one function. That is to steer packets to >> the next segment. >> >> >> >> Granted, we may want to program a service behavior at a segment endpoint= . >> IPv6 includes a Destination Options header that can be used to convey >> information segment endpoints and destination options can contain servic= e >> SIDs. These service SIDs can be as long or short as they need to be. See >> draft-bonica-6man-vpn-dest-opt for an example. >> >> >> >> >> Ron >> >> >> >> >> >> Juniper Internal >> >> *From:* Robert Raszuk >> *Sent:* Thursday, April 18, 2019 10:30 AM >> *To:* Ron Bonica >> *Cc:* Gyan Mishra ; Tom Herbert < >> tom@herbertland.com>; SPRING WG ; ipv6@ietf.org; Dino >> Farinacci ; lisp@ietf.org list >> *Subject:* Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Hi Ron, >> >> >> >> I must observe that your analysis is incorrect. >> >> >> >> SIDs are not only used for TE or traffic steering purposes but what is >> even more interesting for various functions - for example NFV. >> >> >> >> So you need as much SIDs as possible imagination of your value add >> network functions - which will be different from those functions at the >> encap dst which as you indicate in other draft can be carried in >> destination options. >> >> >> >> That debate is still I think open. >> >> >> >> Thx, >> >> R. >> >> >> >> >> >> On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: >> >> Gyan, >> >> >> >> Let=E2=80=99s think about how a network operator might choose a SID size= =E2=80=A6. >> >> >> >> Assume that an MAN includes 100 routers. These routers are connected to >> one another by infrastructure links. Each router has 20 or fewer >> infrastructure links. >> >> >> >> The network operator might assign one loosely routes SID to each router. >> These loosely routed SIDs have network-wide significance (i.e., the cann= ot >> be reused). >> >> >> >> The network operator might also assign one strictly routed SID to each >> link. The strictly routed SIDs have node-local significance only. They c= an >> be reused from one node to another. >> >> >> >> So, in this case, the network operator only needs 120 SIDs. This fits in >> eight bits with plenty of room for growth. >> >> >> >> Now consider another network that includes 30,000 routers. Each router i= s >> connected to its peers by 200 infrastructure links or fewer. This netwo= rk >> would need 30,200 SIDs. This would fit in 16 bits. >> >> >> >> A **really big** network might require more than 32,000 SIDs. So, we >> support a 32-bit SID... >> >> >> >> >> Ron >> >> >> >> >> >> >> >> >> >> Juniper Internal >> >> *From:* Gyan Mishra >> *Sent:* Wednesday, April 17, 2019 10:00 PM >> *To:* Ron Bonica >> *Cc:* Robert Raszuk ; Tom Herbert ; >> SPRING WG ; ipv6@ietf.org; Dino Farinacci < >> farinacci@gmail.com>; lisp@ietf.org list >> *Subject:* Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> >> >> I agree to make the SID align on word boundaries but I am thinking the >> software should have hardware independence if at all possible. >> >> >> >> I think 32 bit is a reasonable size. >> >> >> >> >> >> Gyan S. Mishra >> >> IT Network Engineering & Technology Consultant >> >> Routing & Switching / Service Provider MPLS & IPv6 Expert >> >> www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT >> >> >> Mobile =E2=80=93 202-734-1000 >> >> >> >> Sent from my iPhone >> >> >> On Apr 14, 2019, at 7:54 PM, Ron Bonica < >> rbonica=3D40juniper.net@dmarc.ietf.org> wrote: >> >> Hi Robert, >> >> >> >> In order to make the CRH ASIC-friendly, we have the following constraint= s: >> >> >> >> - Support only a small handful of SID lengths >> - If at all possible, make them align on word boundaries >> >> >> >> Currently, we support 8, 16 and 32 bytes. Do you see a reason why we >> should support a length greater than 32? Is there some length less than = 32 >> that would be beneficial? >> >> >> >> Ron >> >> >> >> >> >> >> >> Juniper Internal >> >> *From:* spring *On Behalf Of *Robert Raszuk >> *Sent:* Friday, April 12, 2019 6:13 PM >> *To:* Tom Herbert >> *Cc:* SPRING WG ; ipv6@ietf.org; Mark Smith < >> markzzzsmith@gmail.com>; Dino Farinacci ; >> lisp@ietf.org list >> *Subject:* Re: [spring] IPv6-compressed-routing-header-crh >> >> >> >> Hi Tom, >> >> >> >> I already suggested this on March 30th ... >> >> >> >> *"**PS. But if you choose to go ahead with CRH I would highly advise to >> make your CRH SID a variable length. "* >> >> >> >> No feedback/response was received from authors. >> >> >> >> Thx, >> R. >> >> >> >> On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote= : >> >> On Fri, Apr 12, 2019 at 1:48 PM Mark Smith >> wrote: >> > >> > Hi Tom, >> > >> > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: >> > > >> > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk >> wrote: >> > > > >> > > > Hi Mark, >> > > > >> > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet >> boundary and a 32 bit alignment, >> > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 >> network. >> > > > > >> > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that ma= y >> also create some opportunities to >> > > > > leverage IPv4 support in existing protocols to suite carrying an= d >> processing 32 bit SIDs with some, possibly >> > > > > slight, modification. For example, perhaps IPv4 Address Family >> support in OSPFv3 (RFC 5838) could be >> > > > > somehow leveraged to suit SR. >> > > > >> > > > >> > > > Thank you for describing your understanding of fundamentals of SR. >> > > > >> > > > I think SR while indeed started with the story of "less control >> plane is good for you" now clearly has evolved into not only reduction o= f >> control plane but what can be even more important to some users ability = to >> request specific behavior via programmed functions of network elements o= n a >> per flow basis without actually per flow or per path signalling or state= . >> > > > >> > > > Yes for some it may be very useful feature and I am sure some will >> call it overload of data plane or . There is no one size fits all. >> > > > >> > > > With that let's observe that till today SR did not require any new >> mapping plane to be distributed in control plane and to be inserted into >> data plane. This is clearly a precedent. >> > > > >> > > > Furthermore as we see in companion documents all additional networ= k >> functionality is being taken away from SRH and is being shifted to >> Destination Options . >> > > > >> > > > As far as mapping plane I already pointed out in my Vector Routing >> proposal that we have one already it is called BGP. One needs to also >> observe that we as industry worked number of years of protocol suite cal= led >> LISP allowing not only very good mapping plane, but also data plane >> integration. CC-ing lisp authors for their comments. Note also work for >> integrating SRv6 with LISP which is already is published. >> > > > >> > > > Since you correctly observed that now SID can be 32 bit and that i= s >> similar to the size of IPv4 my fundamental question is why not use >> something which already exists instead of defining some sort of new fro= m >> scratch ? >> > > > >> > > Robert, >> > > >> > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you >> > > please provide a reference? >> > > >> > >> > To clarify, I've been thinking about the idea of a smaller SID size >> > for IPv6 for a while now (since inserting EHs came up), and thought >> > about what would be a generic single size that might suit SR that >> > wasn't the same size as an IPv6 address. 32 bits seemed suitable to >> > me, although if people wanted bigger, I'd be suggesting 64 bits (not >> > entirely coincidentally the common IID size.) >> > >> > Ron and others have written this draft, which supports SIDS of various >> > sizes - 8, 16 or 32 bits - that triggered this discussion. >> > >> Mark, >> >> Why not just put a SID length field in the header (like RFC6554 but >> more generic). That would allow lengths of 1-16 bytes. Additional >> flags could be used to indicate the semantics of the entries. For >> instance, they might be actual addresses (128 bits for IPv6, 32 bits >> for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) >> where the rest of the address can be inferred, indices into a table, >> labels, etc. >> >> Tom >> >> > "The IPv6 Compressed Routing Header (CRH)" >> > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 >> >> > >> > Regards, >> > Mark. >> > >> > >> > > As for trying to use something that already exists, why does SR used= a >> > > fixed size format for SIDs instead of a variable length format like >> > > that described in RFC6554? Similarly, why does SR define it's own TL= V >> > > format instead of using Hop-by-Hop and Destination Options defined i= n >> > > RFC8200? >> > > >> > > Tom >> > > >> > > > It will be perfectly fine to have full proper SRv6 with SRH and >> LISP or Vector Routing as an alternative options. I really do not see a >> room or need for yet one more mapping plane. What problem does it solve >> which would not be already solved elsewhere ? >> > > > >> > > > Kind regards, >> > > > Robert >> > > > >> > > > >> > > >>> 2) Is there an agreement that solutions which require additional >> per SR path state in both control plane and now in data plane are really >> something we should be endorsing here ? >> > > >> >> > > >> >> > > >> I think so. >> > > >> >> > > >> My understanding of what SR is fundamentally about is to reduce >> control plane state and processing. The trade-off for reduced control pl= ane >> state and processing is to instead carry and encode most or all of that >> information or its semantics as per-packet overhead. >> > > >> >> > > >> If the per-packet overhead becomes too large and expensive, then >> pushing some of that information and processing back into the control pl= ane >> should be ok, as long as there is still a beneficial overall reduction i= n >> control plane state and processing. >> > > >> >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y >> and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perfo= rm >> SR in an IPv6 network. >> > > >> >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may >> also create some opportunities to leverage IPv4 support in existing >> protocols to suite carrying and processing 32 bit SIDs with some, possib= ly >> slight, modification. For example, perhaps IPv4 Address Family support i= n >> OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. >> > > >> >> > > >> Regards, >> > > >> Mark. >> > > > >> > > > ------------------------------------------------------------------= -- >> > > > IETF IPv6 working group mailing list >> > > > ipv6@ietf......org >> > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv= 6 >> >> > > > ------------------------------------------------------------------= -- >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> >> -------------------------------------------------------------------- >> >> --0000000000009f3e650586dfcbd4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Specifically how do you as= sociate different service functions encoded in Dest. Options with specific = segments for selective execution ?=C2=A0

Hint: Execution= of all encoded and carried from src or edge of the network service instruc= tions in destinations options=C2=A0 at each SR node is not an option. Do you now duplicate each SID into Dest O= ptions=C2=A0 to be able to choose which service is executed in which of the= entire path's mid point ?=C2=A0

Many thx= ,
Robert.

On Fri, Apr 19, 2019 at 9:30 AM Robert Raszu= k <robert@raszuk.net> wrote:=

And what happens -=C2=A0

  • = When there is an SRH and Segments Left is not equal to 0 ?=C2=A0

<= /font>

On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica <rbonica@juniper.net> = wrote:

= Hi Jim,

= =C2=A0

= Thanks for asking this insightful question. The answer depends on the SID t= ype.

= =C2=A0

= Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed = only in the following conditions:

= =C2=A0

  • When there is no SRH
  • When there is an SRH and Segments Left is eq= ual to 0

= =C2=A0

= Such SIDs should be encoded in the Destination Options header that immediat= ely precedes the upper-layer header. This is because the Destination Option= s header that immediately precedes the upper-layer header is only processed when:

= =C2=A0

  • When there is no SRH
  • When there is an SRH and Segments Left is eq= ual to 0

= =C2=A0

= Moreover, Destination options are of variable length. So, each SID can be a= s long or short as it needs to be. One SID type can be long while another i= s short and neither needs to be the same length as SIDs that are encoded in the IPv6 Routing header.<= /span>

= =C2=A0

= The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an e= xample of such an encoding. It serves the same purpose as many of the SID d= efined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, END.DX6, END.DT4, END.DT6). As more service SIDs of this t= ype are identified, more destination options will be defined.=

= =C2=A0

= Other Service SIDs can be processed when an SRH is present and Segments Lef= t is greater than zero. Ideally, these SIDs should be encoded in the Destin= ation Options Header that immediately precedes the Routing header. This is because the Destination Options Header that im= mediately precedes the Routing header is processed by every segment endpoin= t. Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is= not the only one.

= =C2=A0

= Another possibility is to encode these SIDs the Destination Options header = that immediately precedes the upper-layer header and required Service Funct= ion Instances that support these SIDs to look ahead.

= =C2=A0

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: James N Guichard <james.n.guichard@huawei.com<= /a>>
Sent: Thursday, April 18, 2019 5:57 PM
To: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>; James N Guichard <= ;james.n.g= uichard@huawei.com>
Subject: RE: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Ron,<= u>

=C2=A0

I am wondering = about how do you plan to handle service SIDs (or any SID with embedded func= tions) at intermediate nodes; draft-bonica-6man-vpn-dest-opt seems to only = handle the case where the endpoint will process the destination option:

=C2=A0

Section 4 says: =E2=80=9CIt MUST NOT appear in a = Hop-by-hop Options header and SHOULD NOT appear in a Destination Options he= ader that precedes a Routing header=E2=80=9D.

=C2=A0

If = you relax the latter and encode the SID in a destination option preceding t= he CRH (or SRH) then wouldn=E2=80=99t every node in the segment-list have t= o process the SID and figure out whether it is a local SID or not? That would seem to be overly complex given you could just enco= de the SID in the CRH (or SRH) and only the node where said SID is exposed = would process it.

= =C2=A0

Tha= nks!

= =C2=A0

Jim=

=C2=A0

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: RE: [spring] IPv6-compressed-routing-header-crh

=C2=A0

= Robert,

= =C2=A0

= The Compressed Routing Header (CRH) has exactly one function. That is to ro= ute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the next segment.

= =C2=A0

= Granted, we may want to program a service behavior at a segment endpoint. I= Pv6 includes a Destination Options header that can be used to convey inform= ation segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as th= ey need to be. See draft-bonica-6man-vpn-dest-opt for an example.=

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0Ron

= =C2=A0

=C2=A0

Juniper Internal

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRIN= G WG <spring@ietf.o= rg>; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Ron,

=C2=A0

I must observe that your analysis is incorrect.=C2= =A0

=C2=A0

SIDs are not only used for TE or traffic steering pu= rposes but what is even more interesting for various functions - for exampl= e NFV.=C2=A0

=C2=A0

So you need as much SIDs as possible imagination of = your value add network functions - which will be different from those funct= ions at the encap dst which as you indicate in other draft can be carried i= n destination options.=C2=A0

=C2=A0

That debate is still I think open.=C2=A0

=C2=A0

Thx,

R.

=C2=A0

=C2=A0

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net= > wrote:

= Gyan,

= =C2=A0

= Let=E2=80=99s think about how a network operator might choose a SID size=E2= =80=A6.

= =C2=A0

= Assume that an MAN includes 100 routers. These routers are connected to one= another by infrastructure links. Each router has 20 or fewer infrastructure links.

= =C2=A0

= The network operator might assign one loosely routes SID to each router. Th= ese loosely routed SIDs have network-wide significance (i.e., the cannot be reused).

= =C2=A0

= The network operator might also assign one strictly routed SID to each link= . The strictly routed SIDs have node-local significance only. They can be reused from one node to another.

= =C2=A0

= So, in this case, the network operator only needs 120 SIDs. This fits in ei= ght bits with plenty of room for growth.

= =C2=A0

= Now consider another network that includes 30,000 routers. Each router is c= onnected to its peers by 200 infrastructure links or fewer.=C2=A0 This network would need 30,200 SIDs. This would fit in 16 bits.<= /u>

= =C2=A0

= A *really big* network might require more than 32,000 SIDs. So, we s= upport a 32-bit SID...

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Ron

= =C2=A0

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG &l= t;spring@ietf.org&= gt;; ipv6@ietf.org; Dino = Farinacci <fari= nacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

=C2=A0

I agree to make the SID align on word boundaries but= I am thinking the software should have hardware independence if at all pos= sible.

=C2=A0

I think 32 bit is a reasonable size.

=C2=A0

=C2=A0

Gyan S. Mishra

IT Network Engineering & Technology Consultant

Routing & Switching / Service Provider MPLS &= ; IPv6 Expert

Mobile =E2=80=93=C2=A0202-734-1000

=C2=A0

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.= ietf.org> wrote:

= Hi Robert,

= =C2=A0

= In order to make the CRH ASIC-friendly, we have the following constraints:<= /span>

= =C2=A0

  • Support only a small handful of SID lengths<= /span>
  • If at all possible, make them align on word = boundaries

= =C2=A0

= Currently, we support 8, 16 and 32 bytes. Do you see a reason why we should= support a length greater than 32? Is there some length less than 32 that would be beneficial?

= =C2=A0

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Ron

= =C2=A0

= =C2=A0

=C2=A0

Juniper Internal

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark = Smith <markz= zzsmith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &= lt;lisp@ietf.org>=
Subject: Re: [spring] IPv6-compressed-routing-header-crh

=C2=A0

Hi Tom,

=C2=A0

I already suggested this on March 30th ...=C2=A0<= /u>

=C2=A0

"PS. But if you choose to go ahead with CRH I would highly advise t= o make your CRH SID a variable length. "

=C2=A0

No feed= back/response was received from authors.=C2=A0

=C2=A0

Thx, R.

=C2=A0

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com> wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.c= om> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network elements on a per flow basis without actually per flo= w or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comm= ents. Note also work for integrating SRv6 with LISP which is already is pub= lished.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leverage= d to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= ......org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

----------------------------------------------------= ----------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------=

--0000000000009f3e650586dfcbd4-- From nobody Fri Apr 19 17:54:25 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D30601201D9; Fri, 19 Apr 2019 17:54:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ntm-YqQVAW_g; Fri, 19 Apr 2019 17:54:02 -0700 (PDT) Received: from mail-lf1-x144.google.com (mail-lf1-x144.google.com [IPv6:2a00:1450:4864:20::144]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A75571201D5; Fri, 19 Apr 2019 17:54:01 -0700 (PDT) Received: by mail-lf1-x144.google.com with SMTP id u17so5072009lfi.3; Fri, 19 Apr 2019 17:54:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=EYoQ52QWBHbFckeJJQeFuHTX76lreLqqHTHCoq2/MrY=; b=o+/9+pQlgkbRibha2NUGZy4wPHavCmq89Hw5zJv7FrJdyZieQz29NnaPwQmy+W2UHj sTqUSuf+HYyBD1uyQwqyAJl3kTlBszp/DDE8Va1LaayfYHpcIDpTZhsDkyMBmwLEc/nc EJ2pjV8T1XAAcS0pyzCUkMIhWPqknzhLHcmpNc8zo0o2wJxidAoIoTS6CLWYx4I7xSSy 60S8J0Kb0ftLoWqtsl/bEXrqi1BRiGQRdPNU08FlvAz7S0RMEFzvvJXEbast1ZkgV7lp WYQ2I0Y8XeV1sKuNm0dZ5pVv4eSCP9N6/HYf7atwv7mTh+TDALsi4noEH27pyaokVkfy KWOw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=EYoQ52QWBHbFckeJJQeFuHTX76lreLqqHTHCoq2/MrY=; b=LehvG5RjG+28UwHfNbbEqlOZqdsHRS7kPZQveaHS20uxzTIS0tUfS0jJ7uy8pbfl6c WA2Ke2dWLy5xE4aVCVuiZYC2GRWpoeV3Ef2dsdJNJuvL+wTR6X0rECp5Ai4/KbBWSJjV kXv5R93F/6Ux0YqFh55waTMYIHrfLtmCVFacdu+jziNACr1NqToMB7eUoQDNwv5cTEz6 h42Hv2fypH8T8efddqOJC0KgTBzqpFXcXWSV0PmIxi9ouQfmcDDmDDxwZ3qVBG/iupOt cvetnET8R+vX1Z2DSHSxa1EdQPq7xagLlOZ7tXrisBWwlgTWaZ1JQYlgued+WlUYpUnH ypzw== X-Gm-Message-State: APjAAAVMHYOAiiJCxAuMxIKlUnGDvmpnFgDhL8N7/RVzf+DzTz95Dcbl p15hh9etXyd7qLrs3TfF889I7/uoYVtX3eIZvtI= X-Google-Smtp-Source: APXvYqxUHfBOQzpAb6j5Pm4ECM66ItQ/+h7P/exjVXE5GUUPwZAaoNxRzNaO48J8Jqy7lbPJQMIUrESwCb/mICF8rfE= X-Received: by 2002:a19:6619:: with SMTP id a25mr3653288lfc.21.1555721639761; Fri, 19 Apr 2019 17:53:59 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 19 Apr 2019 17:53:53 -0700 Message-ID: To: Tom Herbert Cc: Mark Smith , SPRING WG , Dino Farinacci , "ipv6@ietf.org" , "lisp@ietf.org list" , Robert Raszuk Content-Type: multipart/alternative; boundary="000000000000b51c3c0586ebab7e" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2019 00:54:06 -0000 --000000000000b51c3c0586ebab7e Content-Type: text/plain; charset="UTF-8" Hi Tom, in draft-mirsky-6man-unified-id-sr we've proposed the use of 20 and 32 bits-long SIDs in SR EH. Two bits-long field also defined in the Flags to identify the length of SID element in the SR EH: 0b00 - 128-bits SID; 0b01 - 20-bits SID; 0b10 - 32-bits SID 0b11 - reserved for future use. Much appreciate your comments on that draft, suggestions. Regards, Greg On Fri, Apr 12, 2019 at 3:09 PM Tom Herbert wrote: > On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote: > > > > Hi Tom, > > > > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: > > > > > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk > wrote: > > > > > > > > Hi Mark, > > > > > > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, > > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 > network. > > > > > > > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to > > > > > leverage IPv4 support in existing protocols to suite carrying and > processing 32 bit SIDs with some, possibly > > > > > slight, modification. For example, perhaps IPv4 Address Family > support in OSPFv3 (RFC 5838) could be > > > > > somehow leveraged to suit SR. > > > > > > > > > > > > Thank you for describing your understanding of fundamentals of SR. > > > > > > > > I think SR while indeed started with the story of "less control > plane is good for you" now clearly has evolved into not only reduction of > control plane but what can be even more important to some users ability to > request specific behavior via programmed functions of network elements on a > per flow basis without actually per flow or per path signalling or state. > > > > > > > > Yes for some it may be very useful feature and I am sure some will > call it overload of data plane or . There is no one size fits all. > > > > > > > > With that let's observe that till today SR did not require any new > mapping plane to be distributed in control plane and to be inserted into > data plane. This is clearly a precedent. > > > > > > > > Furthermore as we see in companion documents all additional network > functionality is being taken away from SRH and is being shifted to > Destination Options . > > > > > > > > As far as mapping plane I already pointed out in my Vector Routing > proposal that we have one already it is called BGP. One needs to also > observe that we as industry worked number of years of protocol suite called > LISP allowing not only very good mapping plane, but also data plane > integration. CC-ing lisp authors for their comments. Note also work for > integrating SRv6 with LISP which is already is published. > > > > > > > > Since you correctly observed that now SID can be 32 bit and that is > similar to the size of IPv4 my fundamental question is why not use > something which already exists instead of defining some sort of new from > scratch ? > > > > > > > Robert, > > > > > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you > > > please provide a reference? > > > > > > > To clarify, I've been thinking about the idea of a smaller SID size > > for IPv6 for a while now (since inserting EHs came up), and thought > > about what would be a generic single size that might suit SR that > > wasn't the same size as an IPv6 address. 32 bits seemed suitable to > > me, although if people wanted bigger, I'd be suggesting 64 bits (not > > entirely coincidentally the common IID size.) > > > > Ron and others have written this draft, which supports SIDS of various > > sizes - 8, 16 or 32 bits - that triggered this discussion. > > > Mark, > > Why not just put a SID length field in the header (like RFC6554 but > more generic). That would allow lengths of 1-16 bytes. Additional > flags could be used to indicate the semantics of the entries. For > instance, they might be actual addresses (128 bits for IPv6, 32 bits > for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) > where the rest of the address can be inferred, indices into a table, > labels, etc. > > Tom > > > "The IPv6 Compressed Routing Header (CRH)" > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 > > > > Regards, > > Mark. > > > > > > > As for trying to use something that already exists, why does SR used a > > > fixed size format for SIDs instead of a variable length format like > > > that described in RFC6554? Similarly, why does SR define it's own TLV > > > format instead of using Hop-by-Hop and Destination Options defined in > > > RFC8200? > > > > > > Tom > > > > > > > It will be perfectly fine to have full proper SRv6 with SRH and LISP > or Vector Routing as an alternative options. I really do not see a room or > need for yet one more mapping plane. What problem does it solve which would > not be already solved elsewhere ? > > > > > > > > Kind regards, > > > > Robert > > > > > > > > > > > >>> 2) Is there an agreement that solutions which require additional > per SR path state in both control plane and now in data plane are really > something we should be endorsing here ? > > > >> > > > >> > > > >> I think so. > > > >> > > > >> My understanding of what SR is fundamentally about is to reduce > control plane state and processing. The trade-off for reduced control plane > state and processing is to instead carry and encode most or all of that > information or its semantics as per-packet overhead. > > > >> > > > >> If the per-packet overhead becomes too large and expensive, then > pushing some of that information and processing back into the control plane > should be ok, as long as there is still a beneficial overall reduction in > control plane state and processing. > > > >> > > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary > and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform > SR in an IPv6 network. > > > >> > > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may > also create some opportunities to leverage IPv4 support in existing > protocols to suite carrying and processing 32 bit SIDs with some, possibly > slight, modification. For example, perhaps IPv4 Address Family support in > OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. > > > >> > > > >> Regards, > > > >> Mark. > > > > > > > > -------------------------------------------------------------------- > > > > IETF IPv6 working group mailing list > > > > ipv6@ietf.org > > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > > > -------------------------------------------------------------------- > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > --000000000000b51c3c0586ebab7e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
in=C2=A0draf= t-mirsky-6man-unified-id-sr=C2=A0we've proposed the use of 20 and 3= 2 bits-long SIDs in SR EH. Two bits-long field also defined in the Flags to= identify the length of SID element in the SR EH:
=C2=A0 =C2= =A0 =C2=A0 0b00 - 128-bits SID;
=C2=A0 =C2=A0 =C2=A0 0b01 - 20-bi= ts SID;
=C2=A0 =C2=A0 =C2=A0 0b10 - 32-bits SID
=C2=A0 = =C2=A0 =C2=A0 0b11 - reserved for future use.

Much appreciate your comments on that draft, suggestions.

<= /div>
Regards,
Greg

On Fri, A= pr 12, 2019 at 3:09 PM Tom Herbert <tom@herbertland.com> wrote:
On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.co= m> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote: > > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network = elements on a per flow basis without actually per flow or per path signalli= ng or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane inte= gration. CC-ing lisp authors for their comments. Note also work for integra= ting SRv6 with LISP which is already is published.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-= bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support i= n OSPFv3 (RFC 5838) could be somehow leveraged to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf= .org
> > > Administrative Requests: https://www.ietf.o= rg/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

_______________________________________________
spring mailing list
spring@ietf.org https://www.ietf.org/mailman/listinfo/spring
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([2600:1003:b010:7e2a:215a:3d2f:dcc3:ecea]) by smtp.gmail.com with ESMTPSA id f93sm3652261qtb.16.2019.04.19.22.11.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Apr 2019 22:11:52 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-2601A97C-0C72-4CD4-A101-333FA94EBCAE Mime-Version: 1.0 (1.0) From: Gyan Mishra X-Mailer: iPhone Mail (16D57) In-Reply-To: Date: Sat, 20 Apr 2019 01:11:51 -0400 Cc: Ron Bonica , SPRING WG , "ipv6@ietf.org" , Dino Farinacci , "lisp@ietf.org list" Content-Transfer-Encoding: 7bit Message-Id: References: <46DF565F-9A1A-4247-9A05-DE04396C8F5A@gmail.com> To: Robert Raszuk Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2019 05:12:00 -0000 --Apple-Mail-2601A97C-0C72-4CD4-A101-333FA94EBCAE Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Makes sense. Thank you Gyan Sent from my iPhone > On Apr 19, 2019, at 3:30 AM, Robert Raszuk wrote: >=20 >=20 > And what happens -=20 >=20 > When there is an SRH and Segments Left is not equal to 0 ?=20 >=20 >=20 >> On Fri, Apr 19, 2019 at 4:53 AM Ron Bonica wrote: >> Hi Jim, >>=20 >> =20 >>=20 >> Thanks for asking this insightful question. The answer depends on the SID= type. >>=20 >> =20 >>=20 >> Some service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processe= d only in the following conditions: >>=20 >> =20 >>=20 >> When there is no SRH >> When there is an SRH and Segments Left is equal to 0 >> =20 >>=20 >> Such SIDs should be encoded in the Destination Options header that immedi= ately precedes the upper-layer header. This is because the Destination Optio= ns header that immediately precedes the upper-layer header is only processed= when: >>=20 >> =20 >>=20 >> When there is no SRH >> When there is an SRH and Segments Left is equal to 0 >> =20 >>=20 >> Moreover, Destination options are of variable length. So, each SID can be= as long or short as it needs to be. One SID type can be long while another i= s short and neither needs to be the same length as SIDs that are encoded in t= he IPv6 Routing header. >>=20 >> =20 >>=20 >> The VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an= example of such an encoding. It serves the same purpose as many of the SID d= efined in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, END= .DX6, END.DT4, END.DT6). As more service SIDs of this type are identified, m= ore destination options will be defined. >>=20 >> =20 >>=20 >> Other Service SIDs can be processed when an SRH is present and Segments L= eft is greater than zero. Ideally, these SIDs should be encoded in the Desti= nation Options Header that immediately precedes the Routing header. This is= because the Destination Options Header that immediately precedes the Routin= g header is processed by every segment endpoint. Draft-bonica-6man-seg-end-o= pt offers one such encoding scheme, but it is not the only one. >>=20 >> =20 >>=20 >> Another possibility is to encode these SIDs the Destination Options heade= r that immediately precedes the upper-layer header and required Service Func= tion Instances that support these SIDs to look ahead. >>=20 >> =20 >>=20 >> =20 >>=20 >> = Ron >>=20 >> =20 >>=20 >> =20 >>=20 >> =20 >>=20 >> Juniper Internal >> From: James N Guichard =20 >> Sent: Thursday, April 18, 2019 5:57 PM >> To: Ron Bonica ; Robert Raszuk >> Cc: SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list ; James N Guichard >> Subject: RE: [spring] IPv6-compressed-routing-header-crh >>=20 >> =20 >>=20 >> Hi Ron, >>=20 >> =20 >>=20 >> I am wondering about how do you plan to handle service SIDs (or any SID w= ith embedded functions) at intermediate nodes; draft-bonica-6man-vpn-dest-op= t seems to only handle the case where the endpoint will process the destinat= ion option: >>=20 >> =20 >>=20 >> Section 4 says: =E2=80=9CIt MUST NOT appear in a Hop-by-hop Options heade= r and SHOULD NOT appear in a Destination Options header that precedes a Rout= ing header=E2=80=9D. >>=20 >> =20 >>=20 >> If you relax the latter and encode the SID in a destination option preced= ing the CRH (or SRH) then wouldn=E2=80=99t every node in the segment-list ha= ve to process the SID and figure out whether it is a local SID or not? That w= ould seem to be overly complex given you could just encode the SID in the CR= H (or SRH) and only the node where said SID is exposed would process it. >>=20 >> =20 >>=20 >> Thanks! >>=20 >> =20 >>=20 >> Jim >>=20 >> =20 >>=20 >> From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica=20 >> Sent: Thursday, April 18, 2019 4:30 PM >> To: Robert Raszuk >> Cc: SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list >> Subject: RE: [spring] IPv6-compressed-routing-header-crh >>=20 >> =20 >>=20 >> Robert, >>=20 >> =20 >>=20 >> The Compressed Routing Header (CRH) has exactly one function. That is to r= oute a packet for segment to segment along an SR path. Therefore, SIDs conta= ined by the CRH have only one function. That is to steer packets to the next= segment. >>=20 >> =20 >>=20 >> Granted, we may want to program a service behavior at a segment endpoint.= IPv6 includes a Destination Options header that can be used to convey infor= mation segment endpoints and destination options can contain service SIDs. T= hese service SIDs can be as long or short as they need to be. See draft-boni= ca-6man-vpn-dest-opt for an example. >>=20 >> =20 >>=20 >> = Ron >>=20 >> =20 >>=20 >> =20 >>=20 >> Juniper Internal >> From: Robert Raszuk =20 >> Sent: Thursday, April 18, 2019 10:30 AM >> To: Ron Bonica >> Cc: Gyan Mishra ; Tom Herbert ; SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >>=20 >> =20 >>=20 >> Hi Ron, >>=20 >> =20 >>=20 >> I must observe that your analysis is incorrect.=20 >>=20 >> =20 >>=20 >> SIDs are not only used for TE or traffic steering purposes but what is ev= en more interesting for various functions - for example NFV.=20 >>=20 >> =20 >>=20 >> So you need as much SIDs as possible imagination of your value add networ= k functions - which will be different from those functions at the encap dst w= hich as you indicate in other draft can be carried in destination options.=20= >>=20 >> =20 >>=20 >> That debate is still I think open.=20 >>=20 >> =20 >>=20 >> Thx, >>=20 >> R. >>=20 >> =20 >>=20 >> =20 >>=20 >> On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica wrote: >>=20 >> Gyan, >>=20 >> =20 >>=20 >> Let=E2=80=99s think about how a network operator might choose a SID size=E2= =80=A6. >>=20 >> =20 >>=20 >> Assume that an MAN includes 100 routers. These routers are connected to o= ne another by infrastructure links. Each router has 20 or fewer infrastructu= re links. >>=20 >> =20 >>=20 >> The network operator might assign one loosely routes SID to each router. T= hese loosely routed SIDs have network-wide significance (i.e., the cannot be= reused). >>=20 >> =20 >>=20 >> The network operator might also assign one strictly routed SID to each li= nk.. The strictly routed SIDs have node-local significance only. They can be= reused from one node to another. >>=20 >> =20 >>=20 >> So, in this case, the network operator only needs 120 SIDs. This fits in e= ight bits with plenty of room for growth. >>=20 >> =20 >>=20 >> Now consider another network that includes 30,000 routers. Each router is= connected to its peers by 200 infrastructure links or fewer. This network w= ould need 30,200 SIDs. This would fit in 16 bits. >>=20 >> =20 >>=20 >> A *really big* network might require more than 32,000 SIDs. So, we suppor= t a 32-bit SID... >>=20 >> =20 >>=20 >> = Ron >>=20 >> =20 >>=20 >> =20 >>=20 >> =20 >>=20 >> =20 >>=20 >> Juniper Internal >> From: Gyan Mishra =20 >> Sent: Wednesday, April 17, 2019 10:00 PM >> To: Ron Bonica >> Cc: Robert Raszuk ; Tom Herbert ;= SPRING WG ; ipv6@ietf.org; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >>=20 >> =20 >>=20 >> =20 >>=20 >> I agree to make the SID align on word boundaries but I am thinking the so= ftware should have hardware independence if at all possible. >>=20 >> =20 >>=20 >> I think 32 bit is a reasonable size. >>=20 >> =20 >>=20 >> =20 >>=20 >> Gyan S. Mishra >>=20 >> IT Network Engineering & Technology Consultant >>=20 >> Routing & Switching / Service Provider MPLS & IPv6 Expert >>=20 >> www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT >>=20 >> Mobile =E2=80=93 202-734-1000 >>=20 >> =20 >>=20 >> Sent from my iPhone >>=20 >>=20 >> On Apr 14, 2019, at 7:54 PM, Ron Bonica wrote: >>=20 >> Hi Robert, >>=20 >> =20 >>=20 >> In order to make the CRH ASIC-friendly, we have the following constraints= : >>=20 >> =20 >>=20 >> Support only a small handful of SID lengths >> If at all possible, make them align on word boundaries >> =20 >>=20 >> Currently, we support 8, 16 and 32 bytes. Do you see a reason why we shou= ld support a length greater than 32? Is there some length less than 32 that w= ould be beneficial? >>=20 >> =20 >>=20 >> Ron >>=20 >> =20 >>=20 >> =20 >>=20 >> =20 >>=20 >> Juniper Internal >> From: spring On Behalf Of Robert Raszuk >> Sent: Friday, April 12, 2019 6:13 PM >> To: Tom Herbert >> Cc: SPRING WG ; ipv6@ietf.org; Mark Smith ; Dino Farinacci ; lisp@ietf.org list >> Subject: Re: [spring] IPv6-compressed-routing-header-crh >>=20 >> =20 >>=20 >> Hi Tom, >>=20 >> =20 >>=20 >> I already suggested this on March 30th ...=20 >>=20 >> =20 >>=20 >> "PS. But if you choose to go ahead with CRH I would highly advise to make= your CRH SID a variable length. " >>=20 >> =20 >>=20 >> No feedback/response was received from authors.=20 >>=20 >> =20 >>=20 >> Thx, >> R. >>=20 >> =20 >>=20 >> On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert wrote:= >>=20 >> On Fri, Apr 12, 2019 at 1:48 PM Mark Smith wrote= : >> > >> > Hi Tom, >> > >> > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: >> > > >> > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk wro= te: >> > > > >> > > > Hi Mark, >> > > > >> > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet boundar= y and a 32 bit alignment, >> > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 n= etwork. >> > > > > >> > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may= also create some opportunities to >> > > > > leverage IPv4 support in existing protocols to suite carrying and= processing 32 bit SIDs with some, possibly >> > > > > slight, modification. For example, perhaps IPv4 Address Family su= pport in OSPFv3 (RFC 5838) could be >> > > > > somehow leveraged to suit SR. >> > > > >> > > > >> > > > Thank you for describing your understanding of fundamentals of SR. >> > > > >> > > > I think SR while indeed started with the story of "less control pla= ne is good for you" now clearly has evolved into not only reduction of contr= ol plane but what can be even more important to some users ability to reques= t specific behavior via programmed functions of network elements on a per fl= ow basis without actually per flow or per path signalling or state. >> > > > >> > > > Yes for some it may be very useful feature and I am sure some will c= all it overload of data plane or . There is no one size fits all. >> > > > >> > > > With that let's observe that till today SR did not require any new m= apping plane to be distributed in control plane and to be inserted into data= plane. This is clearly a precedent. >> > > > >> > > > Furthermore as we see in companion documents all additional network= functionality is being taken away from SRH and is being shifted to Destinat= ion Options . >> > > > >> > > > As far as mapping plane I already pointed out in my Vector Routing p= roposal that we have one already it is called BGP. One needs to also observe= that we as industry worked number of years of protocol suite called LISP al= lowing not only very good mapping plane, but also data plane integration. CC= -ing lisp authors for their comments. Note also work for integrating SRv6 wi= th LISP which is already is published. >> > > > >> > > > Since you correctly observed that now SID can be 32 bit and that is= similar to the size of IPv4 my fundamental question is why not use somethin= g which already exists instead of defining some sort of new from scratch ? >> > > > >> > > Robert, >> > > >> > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you >> > > please provide a reference? >> > > >> > >> > To clarify, I've been thinking about the idea of a smaller SID size >> > for IPv6 for a while now (since inserting EHs came up), and thought >> > about what would be a generic single size that might suit SR that >> > wasn't the same size as an IPv6 address. 32 bits seemed suitable to >> > me, although if people wanted bigger, I'd be suggesting 64 bits (not >> > entirely coincidentally the common IID size.) >> > >> > Ron and others have written this draft, which supports SIDS of various >> > sizes - 8, 16 or 32 bits - that triggered this discussion. >> > >> Mark, >>=20 >> Why not just put a SID length field in the header (like RFC6554 but >> more generic). That would allow lengths of 1-16 bytes. Additional >> flags could be used to indicate the semantics of the entries. For >> instance, they might be actual addresses (128 bits for IPv6, 32 bits >> for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) >> where the rest of the address can be inferred, indices into a table, >> labels, etc. >>=20 >> Tom >>=20 >> > "The IPv6 Compressed Routing Header (CRH)" >> > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 >> > >> > Regards, >> > Mark. >> > >> > >> > > As for trying to use something that already exists, why does SR used a= >> > > fixed size format for SIDs instead of a variable length format like >> > > that described in RFC6554? Similarly, why does SR define it's own TLV= >> > > format instead of using Hop-by-Hop and Destination Options defined in= >> > > RFC8200? >> > > >> > > Tom >> > > >> > > > It will be perfectly fine to have full proper SRv6 with SRH and LIS= P or Vector Routing as an alternative options. I really do not see a room or= need for yet one more mapping plane. What problem does it solve which would= not be already solved elsewhere ? >> > > > >> > > > Kind regards, >> > > > Robert >> > > > >> > > > >> > > >>> 2) Is there an agreement that solutions which require additional p= er SR path state in both control plane and now in data plane are really some= thing we should be endorsing here ? >> > > >> >> > > >> >> > > >> I think so. >> > > >> >> > > >> My understanding of what SR is fundamentally about is to reduce co= ntrol plane state and processing. The trade-off for reduced control plane st= ate and processing is to instead carry and encode most or all of that inform= ation or its semantics as per-packet overhead. >> > > >> >> > > >> If the per-packet overhead becomes too large and expensive, then p= ushing some of that information and processing back into the control plane s= hould be ok, as long as there is still a beneficial overall reduction in con= trol plane state and processing. >> > > >> >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary= and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform S= R in an IPv6 network. >> > > >> >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may a= lso create some opportunities to leverage IPv4 support in existing protocols= to suite carrying and processing 32 bit SIDs with some, possibly slight, mo= dification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5= 838) could be somehow leveraged to suit SR. >> > > >> >> > > >> Regards, >> > > >> Mark. >> > > > >> > > > -------------------------------------------------------------------= - >> > > > IETF IPv6 working group mailing list >> > > > ipv6@ietf.......org >> > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6= >> > > > -------------------------------------------------------------------= - >>=20 >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >>=20 > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- --Apple-Mail-2601A97C-0C72-4CD4-A101-333FA94EBCAE Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Makes sense.

Thank you

Gyan

Sent from my iPhone

On Apr 19, 2019, at 3= :30 AM, Robert Raszuk <robert@raszuk= .net> wrote:

=

And what happens - 

  • When there is an SRH and Segments Left is not equal to 0= ? 


On Fri= , Apr 19, 2019 at 4:53 AM Ron Bonica <rbonica@juniper.net> wrote:

H= i Jim,

<= u> 

T= hanks for asking this insightful question. The answer depends on the SID typ= e.

<= u> 

S= ome service SIDs (e.g., END.DX4, END.DX6, END.DT4, END.DT6) are processed on= ly in the following conditions:

<= u> 

  • When there is no SRH
  • When there is an SRH and Segments Left is equ= al to 0

<= u> 

S= uch SIDs should be encoded in the Destination Options header that immediatel= y precedes the upper-layer header. This is because the Destination Options h= eader that immediately precedes the upper-layer header is only processed when:

<= u> 

  • When there is no SRH
  • When there is an SRH and Segments Left is equ= al to 0

<= u> 

M= oreover, Destination options are of variable length. So, each SID can be as l= ong or short as it needs to be. One SID type can be long while another is sh= ort and neither needs to be the same length as SIDs that are encoded in the IPv6 Routing header.

<= u> 

T= he VPN Context Information Option [draft-bonica-6man-vpn-dest-opt] is an exa= mple of such an encoding. It serves the same purpose as many of the SID defi= ned in draft-filsfils-spring-srv6-network-programming (e.g., END.DX4, END.DX6, END.DT4, END.DT6). As more service SIDs of this ty= pe are identified, more destination options will be defined.

<= u> 

O= ther Service SIDs can be processed when an SRH is present and Segments Left i= s greater than zero. Ideally, these SIDs should be encoded in the Destinatio= n Options Header that immediately precedes the Routing header. This is because the Destination Options Header that imm= ediately precedes the Routing header is processed by every segment endpoint.= Draft-bonica-6man-seg-end-opt offers one such encoding scheme, but it is no= t the only one.

<= u> 

A= nother possibility is to encode these SIDs the Destination Options header th= at immediately precedes the upper-layer header and required Service Function= Instances that support these SIDs to look ahead.

<= u> 

<= u> 

&= nbsp;            = ;            &nb= sp;            &= nbsp;            = ;            &nb= sp;            &= nbsp;            = ;            &nb= sp;            &= nbsp;  Ron

<= u> 

<= u> 

 

Juniper Internal

From: James N Guichard <james.n.guichard@huawei.com>
Sent: Thursday, April 18, 2019 5:57 PM
To: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list <lisp@ietf.org>; James N Guichard <james.n.guichar= d@huawei.com>
Subject: RE: [spring] IPv6-compressed-routing-header-crh

 

Hi Ron,

 =

I am wondering a= bout how do you plan to handle service SIDs (or any SID with embedded functi= ons) at intermediate nodes; draft-bonica-6man-vpn-dest-opt seems to only han= dle the case where the endpoint will process the destination option:

 =

Section 4 says: =E2=80=9CIt MUST NOT appear in a Hop-= by-hop Options header and SHOULD NOT appear in a Destination Options header t= hat precedes a Routing header=E2=80=9D.

 

If y= ou relax the latter and encode the SID in a destination option preceding the= CRH (or SRH) then wouldn=E2=80=99t every node in the segment-list have to p= rocess the SID and figure out whether it is a local SID or not? That would seem to be overly complex given you could just encod= e the SID in the CRH (or SRH) and only the node where said SID is exposed wo= uld process it.

<= /u> 

Than= ks!

<= /u> 

Jim<= u>

 =

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Ron Bonica
Sent: Thursday, April 18, 2019 4:30 PM
To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &l= t;lisp@ietf.org> Subject: RE: [spring] IPv6-compressed-routing-header-crh

 

R= obert,

<= u> 

T= he Compressed Routing Header (CRH) has exactly one function. That is to rout= e a packet for segment to segment along an SR path. Therefore, SIDs containe= d by the CRH have only one function. That is to steer packets to the next segment.

<= u> 

G= ranted, we may want to program a service behavior at a segment endpoint. IPv= 6 includes a Destination Options header that can be used to convey informati= on segment endpoints and destination options can contain service SIDs. These service SIDs can be as long or short as the= y need to be. See draft-bonica-6man-vpn-dest-opt for an example.

<= u> 

&= nbsp;            = ;            &nb= sp;            &= nbsp;            &nbs= p;            &n= bsp;            =  Ron

<= u> 

 

Juniper Internal

From: Robert Raszuk <robert@raszuk.net>
Sent: Thursday, April 18, 2019 10:30 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Tom Herbert <tom@herbertland.com>; SPRING WG &= lt;spring@ietf.org&= gt;; ipv6@ietf.org; Dino Fa= rinacci <farinac= ci@gmail.com>; lisp@ietf.org list &l= t;lisp@ietf.org> Subject: Re: [spring] IPv6-compressed-routing-header-crh

 

Hi Ron,

 

I must observe that your analysis is incorrect. =

 

SIDs are not only used for TE or traffic steering pur= poses but what is even more interesting for various functions - for example N= FV. 

 

So you need as much SIDs as possible imagination of y= our value add network functions - which will be different from those functio= ns at the encap dst which as you indicate in other draft can be carried in d= estination options. 

 

That debate is still I think open. 

 

Thx,

R.

 

 

On Thu, Apr 18, 2019 at 4:02 PM Ron Bonica <rbonica@juniper.net&g= t; wrote:

G= yan,

&= nbsp;

L= et=E2=80=99s think about how a network operator might choose a SID size=E2=80= =A6.

&= nbsp;

A= ssume that an MAN includes 100 routers. These routers are connected to one a= nother by infrastructure links. Each router has 20 or fewer infrastructure links.

&= nbsp;

T= he network operator might assign one loosely routes SID to each router. Thes= e loosely routed SIDs have network-wide significance (i.e., the cannot be reused).

&= nbsp;

T= he network operator might also assign one strictly routed SID to each link..= The strictly routed SIDs have node-local significance only. They can be reused from one node to another.

&= nbsp;

S= o, in this case, the network operator only needs 120 SIDs. This fits in eigh= t bits with plenty of room for growth.

&= nbsp;

N= ow consider another network that includes 30,000 routers. Each router is con= nected to its peers by 200 infrastructure links or fewer.  This network would need 30,200 SIDs. This would fit in 16 bits.

&= nbsp;

A= *really big* network might require more than 32,000 SIDs. So, we sup= port a 32-bit SID...

&= nbsp;

&= nbsp;            = ;            &nb= sp;            &= nbsp;            = ;            &nb= sp;            Ron

&= nbsp;

&= nbsp;

&= nbsp;

 

Juniper Internal

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, April 17, 2019 10:00 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Robert Raszuk <robert@raszuk.net>; Tom Herbert <tom@herbertland.com>; SPRING WG <<= a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org>;= ipv6@ietf.org; Dino Fa= rinacci <farinac= ci@gmail.com>; lisp@ietf.org list &l= t;lisp@ietf.org> Subject: Re: [spring] IPv6-compressed-routing-header-crh

 

 

I agree to make the SID align on word boundaries but I= am thinking the software should have hardware independence if at all possib= le.

 

I think 32 bit is a reasonable size.

 

 

Gyan S. Mishra

IT Network Engineering & Technology Consultant=

Routing & Switching / Service Provider MPLS &= IPv6 Expert

Mobile =E2=80=93 202-734-1000

 

=

Sent from my iPhone


On Apr 14, 2019, at 7:54 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.ie= tf.org> wrote:

H= i Robert,

&= nbsp;

I= n order to make the CRH ASIC-friendly, we have the following constraints:

&= nbsp;

  • Support only a small handful of SID lengths
  • If at all possible, make them align on word b= oundaries

&= nbsp;

C= urrently, we support 8, 16 and 32 bytes. Do you see a reason why we should s= upport a length greater than 32? Is there some length less than 32 that would be beneficial?

&= nbsp;

&= nbsp;            = ;            &nb= sp;            &= nbsp;            = ;  Ron

&= nbsp;

&= nbsp;

 

Juniper Internal

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, April 12, 2019 6:13 PM
To: Tom Herbert <tom@herbertland.com>
Cc: SPRING WG <spring@ietf.org>; ipv6@ietf.org; Mark S= mith <markzzz= smith@gmail.com>; Dino Farinacci <farinacci@gmail.com>; lisp@ietf.org list &l= t;lisp@ietf.org> Subject: Re: [spring] IPv6-compressed-routing-header-crh

 

Hi Tom,

 

I already suggested this on March 30th ... 

 

"PS. But if you choose to go ahead with CRH I would highly advise to make y= our CRH SID a variable length. "

 

No feedb= ack/response was received from authors. 

 

Thx,
= R.

 

On Sat, Apr 13, 2019 at 12:09 AM Tom Herbert <tom@herbertland.com= > wrote:

On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@gmail.com= > wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.net> wrote:
> > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform SR in= an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite car= rying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address = Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals o= f SR.
> > >
> > > I think SR while indeed started with the story of "less contr= ol plane is good for you" now clearly has evolved into not only reduction of= control plane but what can be even more important to some users ability to r= equest specific behavior via programmed functions of network elements on a per flow basis without actually per flow= or per path signalling or state.
> > >
> > > Yes for some it may be very useful feature and I am sure some= will call it overload of data plane or . There is no one size fits all.
= > > >
> > > With that let's observe that till today SR did not require an= y new mapping plane to be distributed in control plane and to be inserted in= to data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional n= etwork functionality is being taken away from SRH and is being shifted to De= stination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector Ro= uting proposal that we have one already it is called BGP. One needs to also o= bserve that we as industry worked number of years of protocol suite called L= ISP allowing not only very good mapping plane, but also data plane integration. CC-ing lisp authors for their comme= nts. Note also work for integrating SRv6 with LISP which is already is publi= shed.
> > >
> > > Since you correctly observed that now SID can be 32 bit and t= hat is similar to the size of IPv4 my fundamental question is why not use so= mething which already exists instead of defining some sort of new  from= scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. Can yo= u
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID size
= > for IPv6 for a while now (since inserting EHs came up), and thought
= > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable to
= > me, although if people wanted bigger, I'd be suggesting 64 bits (not > entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various<= br> > sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR us= ed a
> > fixed size format for SIDs instead of a variable length format lik= e
> > that described in RFC6554? Similarly, why does SR define it's own T= LV
> > format instead of using Hop-by-Hop and Destination Options defined= in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH a= nd LISP or Vector Routing as an alternative options. I really do not see a r= oom or need for yet one more mapping plane. What problem does it solve which= would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which require= additional per SR path state in both control plane and now in data plane ar= e really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to r= educe control plane state and processing. The trade-off for reduced control p= lane state and processing is to instead carry and encode most or all of that= information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensiv= e, then pushing some of that information and processing back into the contro= l plane should be ok, as long as there is still a beneficial overall reducti= on in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet= boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to= perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses, t= hat may also create some opportunities to leverage IPv4 support in existing p= rotocols to suite carrying and processing 32 bit SIDs with some, possibly sl= ight, modification. For example, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be somehow leveraged= to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > -------------------------------------------------------------= -------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf.= ......org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> > > -------------------------------------------------------------= -------

-----------------------------------------------------= ---------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------<= u>

--------= ------------------------------------------------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailma= n/listinfo/ipv6
----------------------------------------= ----------------------------
= --Apple-Mail-2601A97C-0C72-4CD4-A101-333FA94EBCAE-- From nobody Sat Apr 20 12:50:51 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A1C5C120110 for ; Sat, 20 Apr 2019 12:50:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t0rDlG-Ae1Ye for ; Sat, 20 Apr 2019 12:50:41 -0700 (PDT) Received: from mail-qt1-x843.google.com (mail-qt1-x843.google.com [IPv6:2607:f8b0:4864:20::843]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5E3E91200EB for ; Sat, 20 Apr 2019 12:50:41 -0700 (PDT) Received: by mail-qt1-x843.google.com with SMTP id s15so8575425qtn.3 for ; Sat, 20 Apr 2019 12:50:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8cIOafAuD2dsS28F5sWAySH6KcU89OCS2nRrwhffpEY=; b=nWdEaFzQMZDp5FpTV04CTZzVPcyHoy6wzG0WI+UQnJJ/YXuyc1PDRKzu9f7rE5BgNa /nmzK78E36u92FvanqCHRZL98yWJZJuSLQdPHByHb6X+eTfSo2lVO/w+BKiL3a/uBgCj GQC4/YD19iqyXHaogK2EL5+/+lJCKsx+iS7RbnTLo2PMIoTKlu3ucQ5xqXOx753zTsbO VGk52C5N9yUkckHAWmds8kPtHzu1pQbK2MjCYTog1CRA4a3ySxwhFbmLzCR4IAZhmE7r MJdsDUEJpsIsRRxorIemvKJ8fGyHOUieOR7EbC2LNsA8pNb+NgqCoGYbtO2I9PxdUGZ8 wC+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8cIOafAuD2dsS28F5sWAySH6KcU89OCS2nRrwhffpEY=; b=SxqfdfgeZGAq6FSfJz4UrGY73FnV44pkUer1GiO40f3dgHb1vj7tqnGjGLz3Rn2TIF /64I0rFTkjes3TtQPVGKUXFMzFcG3F/AEEcChRybHwgr3mIH03+TYAtSFEu/bwKVGj3b okjleJEZk0my5C6gRWFpUYIRUXKFE/KWu2+62JIlGKH/EFQskmrxuqjMYH4eu/kRo5ii 7bcJrBkgdomrKzQB2IJ1GQ8u4X3SvD/2ymDS3ZeBMhqfDudSKyW4grWdWcY/A7mrSlhZ Yv9N8aVZ8stk2SzfTDFINcOQwlkAXvLMIbLFblGW8DnBHHKqEQHHG8QOxCwpOMNXNRED tWDA== X-Gm-Message-State: APjAAAU1Wxn7d3DinOm1whoFyEDRKC5QLs40lLqp85WK63r8GHiuutEW 8P/GcNX+6vl3ONbWOT71C8fxBmEevGNpHomUM9gZlw== X-Google-Smtp-Source: APXvYqwUrzMUSaYKBWSOXr3vQCc6PoNeBigv5CTeW9GK4osoqoRHYI9CKimeoLYDVdR2ZEmKjEQuu+NXhfN+GKyngBs= X-Received: by 2002:a05:6214:242:: with SMTP id k2mr2541089qvt.168.1555789840281; Sat, 20 Apr 2019 12:50:40 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Tom Herbert Date: Sat, 20 Apr 2019 12:50:27 -0700 Message-ID: To: Greg Mirsky Cc: Mark Smith , SPRING WG , Dino Farinacci , "ipv6@ietf.org" , "lisp@ietf.org list" , Robert Raszuk Content-Type: multipart/alternative; boundary="000000000000c687930586fb8ca0" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2019 19:50:46 -0000 --000000000000c687930586fb8ca0 Content-Type: text/plain; charset="UTF-8" On Fri, Apr 19, 2019, 5:54 PM Greg Mirsky wrote: > Hi Tom, > in draft-mirsky-6man-unified-id-sr > we've > proposed the use of 20 and 32 bits-long SIDs in SR EH. Two bits-long field > also defined in the Flags to identify the length of SID element in the SR > EH: > 0b00 - 128-bits SID; > 0b01 - 20-bits SID; > 0b10 - 32-bits SID > 0b11 - reserved for future use. > Hi Greg, 20 bit fields in a list seems a little odd; how is this packed in a packet? It's more typical to have byte alignment at least and if the fields hold numerical values they would usually be bytes, words, double words, etc. with natural alignment maintained. In a two bit representation of length, I think best possibilities are 16, 32, 64, and 128 bits. Tom > Much appreciate your comments on that draft, suggestions. > > Regards, > Greg > > > On Fri, Apr 12, 2019 at 3:09 PM Tom Herbert wrote: > >> On Fri, Apr 12, 2019 at 1:48 PM Mark Smith >> wrote: >> > >> > Hi Tom, >> > >> > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: >> > > >> > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk >> wrote: >> > > > >> > > > Hi Mark, >> > > > >> > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet >> boundary and a 32 bit alignment, >> > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 >> network. >> > > > > >> > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that may >> also create some opportunities to >> > > > > leverage IPv4 support in existing protocols to suite carrying and >> processing 32 bit SIDs with some, possibly >> > > > > slight, modification. For example, perhaps IPv4 Address Family >> support in OSPFv3 (RFC 5838) could be >> > > > > somehow leveraged to suit SR. >> > > > >> > > > >> > > > Thank you for describing your understanding of fundamentals of SR. >> > > > >> > > > I think SR while indeed started with the story of "less control >> plane is good for you" now clearly has evolved into not only reduction of >> control plane but what can be even more important to some users ability to >> request specific behavior via programmed functions of network elements on a >> per flow basis without actually per flow or per path signalling or state. >> > > > >> > > > Yes for some it may be very useful feature and I am sure some will >> call it overload of data plane or . There is no one size fits all. >> > > > >> > > > With that let's observe that till today SR did not require any new >> mapping plane to be distributed in control plane and to be inserted into >> data plane. This is clearly a precedent. >> > > > >> > > > Furthermore as we see in companion documents all additional network >> functionality is being taken away from SRH and is being shifted to >> Destination Options . >> > > > >> > > > As far as mapping plane I already pointed out in my Vector Routing >> proposal that we have one already it is called BGP. One needs to also >> observe that we as industry worked number of years of protocol suite called >> LISP allowing not only very good mapping plane, but also data plane >> integration. CC-ing lisp authors for their comments. Note also work for >> integrating SRv6 with LISP which is already is published. >> > > > >> > > > Since you correctly observed that now SID can be 32 bit and that is >> similar to the size of IPv4 my fundamental question is why not use >> something which already exists instead of defining some sort of new from >> scratch ? >> > > > >> > > Robert, >> > > >> > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you >> > > please provide a reference? >> > > >> > >> > To clarify, I've been thinking about the idea of a smaller SID size >> > for IPv6 for a while now (since inserting EHs came up), and thought >> > about what would be a generic single size that might suit SR that >> > wasn't the same size as an IPv6 address. 32 bits seemed suitable to >> > me, although if people wanted bigger, I'd be suggesting 64 bits (not >> > entirely coincidentally the common IID size.) >> > >> > Ron and others have written this draft, which supports SIDS of various >> > sizes - 8, 16 or 32 bits - that triggered this discussion. >> > >> Mark, >> >> Why not just put a SID length field in the header (like RFC6554 but >> more generic). That would allow lengths of 1-16 bytes. Additional >> flags could be used to indicate the semantics of the entries. For >> instance, they might be actual addresses (128 bits for IPv6, 32 bits >> for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) >> where the rest of the address can be inferred, indices into a table, >> labels, etc. >> >> Tom >> >> > "The IPv6 Compressed Routing Header (CRH)" >> > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 >> > >> > Regards, >> > Mark. >> > >> > >> > > As for trying to use something that already exists, why does SR used a >> > > fixed size format for SIDs instead of a variable length format like >> > > that described in RFC6554? Similarly, why does SR define it's own TLV >> > > format instead of using Hop-by-Hop and Destination Options defined in >> > > RFC8200? >> > > >> > > Tom >> > > >> > > > It will be perfectly fine to have full proper SRv6 with SRH and >> LISP or Vector Routing as an alternative options. I really do not see a >> room or need for yet one more mapping plane. What problem does it solve >> which would not be already solved elsewhere ? >> > > > >> > > > Kind regards, >> > > > Robert >> > > > >> > > > >> > > >>> 2) Is there an agreement that solutions which require additional >> per SR path state in both control plane and now in data plane are really >> something we should be endorsing here ? >> > > >> >> > > >> >> > > >> I think so. >> > > >> >> > > >> My understanding of what SR is fundamentally about is to reduce >> control plane state and processing. The trade-off for reduced control plane >> state and processing is to instead carry and encode most or all of that >> information or its semantics as per-packet overhead. >> > > >> >> > > >> If the per-packet overhead becomes too large and expensive, then >> pushing some of that information and processing back into the control plane >> should be ok, as long as there is still a beneficial overall reduction in >> control plane state and processing. >> > > >> >> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary >> and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to perform >> SR in an IPv6 network. >> > > >> >> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may >> also create some opportunities to leverage IPv4 support in existing >> protocols to suite carrying and processing 32 bit SIDs with some, possibly >> slight, modification. For example, perhaps IPv4 Address Family support in >> OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. >> > > >> >> > > >> Regards, >> > > >> Mark. >> > > > >> > > > -------------------------------------------------------------------- >> > > > IETF IPv6 working group mailing list >> > > > ipv6@ietf.org >> > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> > > > -------------------------------------------------------------------- >> >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >> > --000000000000c687930586fb8ca0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Fri, Apr 19, 2019, 5:54 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
<= /div>
Hi Tom,
in=C2=A0draft-= mirsky-6man-unified-id-sr=C2=A0we've proposed the use of 20 and 32 = bits-long SIDs in SR EH. Two bits-long field also defined in the Flags to i= dentify the length of SID element in the SR EH:
=C2=A0 =C2= =A0 =C2=A0 0b00 - 128-bits SID;
=C2=A0 =C2=A0 =C2=A0 0b01 - 20-bi= ts SID;
=C2=A0 =C2=A0 =C2=A0 0b10 - 32-bits SID
=C2=A0 = =C2=A0 =C2=A0 0b11 - reserved for future use.
=

Hi G= reg,

20 bit fields in a = list seems a little odd; how is this packed in a packet? It's more typi= cal to have byte alignment at least and if the fields hold numerical values= they would usually be bytes, words, double words, etc. with natural alignm= ent maintained. In a two bit representation of length, I think best possibi= lities are 16, 32, 64, and 128 bits.

Tom


Much appreciate your comment= s on that draft, suggestions.

Regards,
G= reg


On Fri, Apr 12, 2019 at 3:09 PM Tom Her= bert <tom@herbertland.com> wrote:
On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <= ;markzzzsmith@gmail.com> wrote:
>
> Hi Tom,
>
> On Sat, 13 Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com= > wrote:
> >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <robert@raszuk.ne= t> wrote:
> > >
> > > Hi Mark,
> > >
> > > > As MPLS SR SIDs are 20 bits, then rounding up to an oct= et boundary and a 32 bit alignment,
> > > > I'd think 32 bit SIDs would be adequate to perform = SR in an IPv6 network.
> > > >
> > > > As 32 bit SIDs are also the same size as IPv4 addresses= , that may also create some opportunities to
> > > > leverage IPv4 support in existing protocols to suite ca= rrying and processing 32 bit SIDs with some, possibly
> > > > slight, modification. For example, perhaps IPv4 Address= Family support in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged to suit SR.
> > >
> > >
> > > Thank you for describing your understanding of fundamentals = of SR.
> > >
> > > I think SR while indeed started with the story of "less= control plane is good for you" now clearly has evolved into not only = reduction of control plane but what can be even more important to some user= s ability to request specific behavior via programmed functions of network = elements on a per flow basis without actually per flow or per path signalli= ng or state.
> > >
> > > Yes for some it may be very useful feature and I am sure som= e will call it overload of data plane or . There is no one size fits all. > > >
> > > With that let's observe that till today SR did not requi= re any new mapping plane to be distributed in control plane and to be inser= ted into data plane. This is clearly a precedent.
> > >
> > > Furthermore as we see in companion documents all additional = network functionality is being taken away from SRH and is being shifted to = Destination Options .
> > >
> > > As far as mapping plane I already pointed out in my Vector R= outing proposal that we have one already it is called BGP. One needs to als= o observe that we as industry worked number of years of protocol suite call= ed LISP allowing not only very good mapping plane, but also data plane inte= gration. CC-ing lisp authors for their comments. Note also work for integra= ting SRv6 with LISP which is already is published.
> > >
> > > Since you correctly observed that now SID can be 32 bit and = that is similar to the size of IPv4 my fundamental question is why not use = something which already exists instead of defining some sort of new=C2=A0 f= rom scratch ?
> > >
> > Robert,
> >
> > I don't see in the SRH draft where 32 bit SIDs are defined. C= an you
> > please provide a reference?
> >
>
> To clarify, I've been thinking about the idea of a smaller SID siz= e
> for IPv6 for a while now (since inserting EHs came up), and thought > about what would be a generic single size that might suit SR that
> wasn't the same size as an IPv6 address. 32 bits seemed suitable t= o
> me, although if people wanted bigger, I'd be suggesting 64 bits (n= ot
> entirely coincidentally the common IID size.)
>
> Ron and others have written this draft, which supports SIDS of various=
> sizes - 8, 16 or 32 bits - that triggered this discussion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
more generic). That would allow lengths of 1-16 bytes. Additional
flags could be used to indicate the semantics of the entries. For
instance, they might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), parts of addresses (prefixes of suffixes like in RFC6554)
where the rest of the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/= html/draft-bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
>
>
> > As for trying to use something that already exists, why does SR u= sed a
> > fixed size format for SIDs instead of a variable length format li= ke
> > that described in RFC6554? Similarly, why does SR define it's= own TLV
> > format instead of using Hop-by-Hop and Destination Options define= d in
> > RFC8200?
> >
> > Tom
> >
> > > It will be perfectly fine to have full proper SRv6 with SRH = and LISP or Vector Routing as an alternative options. I really do not see a= room or need for yet one more mapping plane. What problem does it solve wh= ich would not be already solved elsewhere ?
> > >
> > > Kind regards,
> > > Robert
> > >
> > >
> > >>> 2) Is there an agreement that solutions which requir= e additional per SR path state in both control plane and now in data plane = are really something we should be endorsing here ?
> > >>
> > >>
> > >> I think so.
> > >>
> > >> My understanding of what SR is fundamentally about is to= reduce control plane state and processing. The trade-off for reduced contr= ol plane state and processing is to instead carry and encode most or all of= that information or its semantics as per-packet overhead.
> > >>
> > >> If the per-packet overhead becomes too large and expensi= ve, then pushing some of that information and processing back into the cont= rol plane should be ok, as long as there is still a beneficial overall redu= ction in control plane state and processing.
> > >>
> > >> As MPLS SR SIDs are 20 bits, then rounding up to an octe= t boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequ= ate to perform SR in an IPv6 network.
> > >>
> > >> As 32 bit SIDs are also the same size as IPv4 addresses,= that may also create some opportunities to leverage IPv4 support in existi= ng protocols to suite carrying and processing 32 bit SIDs with some, possib= ly slight, modification. For example, perhaps IPv4 Address Family support i= n OSPFv3 (RFC 5838) could be somehow leveraged to suit SR.
> > >>
> > >> Regards,
> > >> Mark.
> > >
> > > ------------------------------------------------------------= --------
> > > IETF IPv6 working group mailing list
> > > ipv6@ietf.org
> > > Administrative Requests: https:/= /www.ietf.org/mailman/listinfo/ipv6
> > > ------------------------------------------------------------= --------

_______________________________________________
spring mailing list
spr= ing@ietf.org
https://www.ietf.org/mailman/listinfo/spring<= /a>
--000000000000c687930586fb8ca0-- From nobody Sun Apr 21 12:46:03 2019 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 32E771203E2; Sun, 21 Apr 2019 12:45:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7QU5AHT1QbBe; Sun, 21 Apr 2019 12:45:50 -0700 (PDT) Received: from mail-lf1-x144.google.com (mail-lf1-x144.google.com [IPv6:2a00:1450:4864:20::144]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 345621203DB; Sun, 21 Apr 2019 12:45:50 -0700 (PDT) Received: by mail-lf1-x144.google.com with SMTP id t11so7527541lfl.12; Sun, 21 Apr 2019 12:45:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=CuHatCMinUt8K61MjvkUWCeUCzzVMXf/+npgwmMmVMk=; b=FxnDpOScHAmB1J6F7SvUxn1KevAyTvYAExxAPxvVlk0lNI50+8o+t1wvA2J4PQ6vur q1g+7TbtvvISWFtq9BfolBkRHGiLgLU1tBmesWM31SD1tdELi09IFOrX+8DnZPdOyWXG B7KNJZwZjd5eJlCQuhpiYESPsH5xSb4Btqp/LvFwM5Bi0xGC96UVxCz2fzqKAovDIx7R FyX++p/MFuEeKG7aR2npE4bHC1QZ1Ili2LFrSkmXOnIct+mhglIgrf8cZMq0rb/bb05I N6mkj4idf2jrP5dbKfZZRyY9+4jtWPubC5BRItzu+wvhh+qJ6OJo3GzWSZdDXHGhtNSp H9kQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=CuHatCMinUt8K61MjvkUWCeUCzzVMXf/+npgwmMmVMk=; b=V1ypLTKvv/IM021m/ORaT2tM3AvW3H4DiWY2LtUqoxW4WS23f7stSsxlSPZQRRT76i ypAO2vXyRZG2H/d/3nfn6ZltnpbfIjuqDfyljuVQp1klUE128Pute+HaXQ5lq/uwjvHL XzYWs3Jonio712aFRtLruDI5PX/oLd7Ll0Bmu3iSYejQaZ+fgOhOfDtXAbOZEJLW2etX eB/e/SKbZ7ErIrxxHE9EDs6WGgqIyB+zIFqE3d01IAARoHX22BuwRbvIYX9YiAUv84TK 0z9aqnGucZ0XQgImxfcgT943chmpKtgoKuAKfUsTJ0yCmM5teMiSJHpJ1IO41QtXqdk9 SRnQ== X-Gm-Message-State: APjAAAVYUArJKBuaNUUQ8nTIZXfELye7Ht97WfQWr2tckPNSuUp3S3tK wHVgyfI7sk48KLi1/QeBx1OjsBB7tjyznkN5wx8= X-Google-Smtp-Source: APXvYqzb3HwMyfuv+s3JTf0BadnVqXEzZmScKW/FtQMziflQgwsUV6r0P1Xycn0Xdog/n6jLy8bZvQaNQ32IvAwC/78= X-Received: by 2002:ac2:5a11:: with SMTP id q17mr8236063lfn.145.1555875948281; Sun, 21 Apr 2019 12:45:48 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Sun, 21 Apr 2019 12:45:36 -0700 Message-ID: To: Tom Herbert Cc: Mark Smith , SPRING WG , Dino Farinacci , "ipv6@ietf.org" , "lisp@ietf.org list" , Robert Raszuk Content-Type: multipart/alternative; boundary="0000000000003643be05870f99ae" Archived-At: Subject: Re: [spring] IPv6-compressed-routing-header-crh X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2019 19:45:54 -0000 --0000000000003643be05870f99ae Content-Type: text/plain; charset="UTF-8" Hi Tom, thank you for your feedback and the suggestion. In proposing the use of 20 bits-long SID we've followed the existing IGP-SR extensions. Both draft-ietf-ospf-segment-routing-extensions and draft-ietf-isis-segment-routing-extensions advertisement of 4 octets-long SIDs as well as 20 bits-long (the latter as 20 rightmost bits in 3 octets-long field). Though the proposal to using 20 bits-long SIDs in IPv6 SR EH may be considered as duplication of the draft-ietf-mpls-sr-over-ip, SR EH has very useful property, for example in OAM, of preserving the SR path. I think that we can expand the length of the field in SR EH to support 16 and 64 bits-long SIDs in addition to ones being proposed in the draft. Much appreciate your comments. Regards, Greg On Sat, Apr 20, 2019 at 12:50 PM Tom Herbert wrote: > > > On Fri, Apr 19, 2019, 5:54 PM Greg Mirsky wrote: > >> Hi Tom, >> in draft-mirsky-6man-unified-id-sr >> we've >> proposed the use of 20 and 32 bits-long SIDs in SR EH. Two bits-long field >> also defined in the Flags to identify the length of SID element in the SR >> EH: >> 0b00 - 128-bits SID; >> 0b01 - 20-bits SID; >> 0b10 - 32-bits SID >> 0b11 - reserved for future use. >> > > Hi Greg, > > 20 bit fields in a list seems a little odd; how is this packed in a > packet? It's more typical to have byte alignment at least and if the fields > hold numerical values they would usually be bytes, words, double words, > etc. with natural alignment maintained. In a two bit representation of > length, I think best possibilities are 16, 32, 64, and 128 bits. > > Tom > > >> Much appreciate your comments on that draft, suggestions. >> >> Regards, >> Greg >> >> >> On Fri, Apr 12, 2019 at 3:09 PM Tom Herbert wrote: >> >>> On Fri, Apr 12, 2019 at 1:48 PM Mark Smith >>> wrote: >>> > >>> > Hi Tom, >>> > >>> > On Sat, 13 Apr 2019 at 00:26, Tom Herbert wrote: >>> > > >>> > > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk >>> wrote: >>> > > > >>> > > > Hi Mark, >>> > > > >>> > > > > As MPLS SR SIDs are 20 bits, then rounding up to an octet >>> boundary and a 32 bit alignment, >>> > > > > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 >>> network. >>> > > > > >>> > > > > As 32 bit SIDs are also the same size as IPv4 addresses, that >>> may also create some opportunities to >>> > > > > leverage IPv4 support in existing protocols to suite carrying >>> and processing 32 bit SIDs with some, possibly >>> > > > > slight, modification. For example, perhaps IPv4 Address Family >>> support in OSPFv3 (RFC 5838) could be >>> > > > > somehow leveraged to suit SR. >>> > > > >>> > > > >>> > > > Thank you for describing your understanding of fundamentals of SR. >>> > > > >>> > > > I think SR while indeed started with the story of "less control >>> plane is good for you" now clearly has evolved into not only reduction of >>> control plane but what can be even more important to some users ability to >>> request specific behavior via programmed functions of network elements on a >>> per flow basis without actually per flow or per path signalling or state. >>> > > > >>> > > > Yes for some it may be very useful feature and I am sure some will >>> call it overload of data plane or . There is no one size fits all. >>> > > > >>> > > > With that let's observe that till today SR did not require any new >>> mapping plane to be distributed in control plane and to be inserted into >>> data plane. This is clearly a precedent. >>> > > > >>> > > > Furthermore as we see in companion documents all additional >>> network functionality is being taken away from SRH and is being shifted to >>> Destination Options . >>> > > > >>> > > > As far as mapping plane I already pointed out in my Vector Routing >>> proposal that we have one already it is called BGP. One needs to also >>> observe that we as industry worked number of years of protocol suite called >>> LISP allowing not only very good mapping plane, but also data plane >>> integration. CC-ing lisp authors for their comments. Note also work for >>> integrating SRv6 with LISP which is already is published. >>> > > > >>> > > > Since you correctly observed that now SID can be 32 bit and that >>> is similar to the size of IPv4 my fundamental question is why not use >>> something which already exists instead of defining some sort of new from >>> scratch ? >>> > > > >>> > > Robert, >>> > > >>> > > I don't see in the SRH draft where 32 bit SIDs are defined. Can you >>> > > please provide a reference? >>> > > >>> > >>> > To clarify, I've been thinking about the idea of a smaller SID size >>> > for IPv6 for a while now (since inserting EHs came up), and thought >>> > about what would be a generic single size that might suit SR that >>> > wasn't the same size as an IPv6 address. 32 bits seemed suitable to >>> > me, although if people wanted bigger, I'd be suggesting 64 bits (not >>> > entirely coincidentally the common IID size.) >>> > >>> > Ron and others have written this draft, which supports SIDS of various >>> > sizes - 8, 16 or 32 bits - that triggered this discussion. >>> > >>> Mark, >>> >>> Why not just put a SID length field in the header (like RFC6554 but >>> more generic). That would allow lengths of 1-16 bytes. Additional >>> flags could be used to indicate the semantics of the entries. For >>> instance, they might be actual addresses (128 bits for IPv6, 32 bits >>> for IPv4), parts of addresses (prefixes of suffixes like in RFC6554) >>> where the rest of the address can be inferred, indices into a table, >>> labels, etc. >>> >>> Tom >>> >>> > "The IPv6 Compressed Routing Header (CRH)" >>> > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr-03 >>> > >>> > Regards, >>> > Mark. >>> > >>> > >>> > > As for trying to use something that already exists, why does SR used >>> a >>> > > fixed size format for SIDs instead of a variable length format like >>> > > that described in RFC6554? Similarly, why does SR define it's own TLV >>> > > format instead of using Hop-by-Hop and Destination Options defined in >>> > > RFC8200? >>> > > >>> > > Tom >>> > > >>> > > > It will be perfectly fine to have full proper SRv6 with SRH and >>> LISP or Vector Routing as an alternative options. I really do not see a >>> room or need for yet one more mapping plane. What problem does it solve >>> which would not be already solved elsewhere ? >>> > > > >>> > > > Kind regards, >>> > > > Robert >>> > > > >>> > > > >>> > > >>> 2) Is there an agreement that solutions which require additional >>> per SR path state in both control plane and now in data plane are really >>> something we should be endorsing here ? >>> > > >> >>> > > >> >>> > > >> I think so. >>> > > >> >>> > > >> My understanding of what SR is fundamentally about is to reduce >>> control plane state and processing. The trade-off for reduced control plane >>> state and processing is to instead carry and encode most or all of that >>> information or its semantics as per-packet overhead. >>> > > >> >>> > > >> If the per-packet overhead becomes too large and expensive, then >>> pushing some of that information and processing back into the control plane >>> should be ok, as long as there is still a beneficial overall reduction in >>> control plane state and processing. >>> > > >> >>> > > >> As MPLS SR SIDs are 20 bits, then rounding up to an octet >>> boundary and a 32 bit alignment, I'd think 32 bit SIDs would be adequate to >>> perform SR in an IPv6 network. >>> > > >> >>> > > >> As 32 bit SIDs are also the same size as IPv4 addresses, that may >>> also create some opportunities to leverage IPv4 support in existing >>> protocols to suite carrying and processing 32 bit SIDs with some, possibly >>> slight, modification. For example, perhaps IPv4 Address Family support in >>> OSPFv3 (RFC 5838) could be somehow leveraged to suit SR. >>> > > >> >>> > > >> Regards, >>> > > >> Mark. >>> > > > >>> > > > >>> -------------------------------------------------------------------- >>> > > > IETF IPv6 working group mailing list >>> > > > ipv6@ietf.org >>> > > > Administrative Requests: >>> https://www.ietf.org/mailman/listinfo/ipv6 >>> > > > >>> -------------------------------------------------------------------- >>> >>> _______________________________________________ >>> spring mailing list >>> spring@ietf.org >>> https://www.ietf.org/mailman/listinfo/spring >>> >> --0000000000003643be05870f99ae Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
thank you for your feedback and the suggestion. In pr= oposing the use of 20 bits-long=C2=A0SID we've followed the existing IG= P-SR extensions. Both draft-ietf-ospf-segment-routing-extensions and=C2=A0d= raft-ietf-isis-segment-routing-extensions advertisement of 4 octets-long SI= Ds as well as 20 bits-long (the latter as 20 rightmost bits in 3 octets-lon= g field). Though the proposal to using 20 bits-long SIDs in IPv6 SR EH may = be considered as duplication of the=C2=A0draft-ietf-mpls-sr-over-ip, SR EH = has very useful property, for example in OAM, of preserving the SR path.
I think that we can expand the length of the field in SR EH to supp= ort 16 and 64 bits-long SIDs in addition to ones being proposed in the draf= t.
Much appreciate your comments.

Regard= s,
Greg

On Sat, Apr 20, 2019 at 12:50 PM T= om Herbert <tom@herbertland.com> wrote:


Hi Tom,
in=C2=A0draft-mirsky-6man-unified-id-sr=C2=A0we&#= 39;ve proposed the use of 20 and 32 bits-long SIDs in SR EH. Two bits-long = field also defined in the Flags to identify the length of SID element in th= e SR EH:
=C2=A0 =C2=A0 =C2=A0 0b00 - 128-bits SID;
=C2=A0 =C2=A0 =C2=A0 0b01 - 20-bits SID;
=C2=A0 =C2=A0 =C2=A0 0b= 10 - 32-bits SID
=C2=A0 =C2=A0 =C2=A0 0b11 - reserved for future = use.

Hi Greg,

20 bit fields in a list seems a little odd; how is this pack= ed in a packet? It's more typical to have byte alignment at least and i= f the fields hold numerical values they would usually be bytes, words, doub= le words, etc. with natural alignment maintained. In a two bit representati= on of length, I think best possibilities are 16, 32, 64, and 128 bits.

Tom
<= br>

Much appreciate your comments on that draft, sugge= stions.

Regards,
Greg


On Fri, Apr 12, 2019 at 3:09 PM Tom Herbert <tom@herber= tland.com> wrote:
On Fri, Apr 12, 2019 at 1:48 PM Mark Smith <markzzzsmith@= gmail.com> wrote:
>
> Hi Tom,
>
> On Sat, 13= Apr 2019 at 00:26, Tom Herbert <tom@herbertland.com> wrote:
= > >
> > On Sun, Mar 31, 2019 at 7:40 AM Robert Raszuk <rob= ert@raszuk.net> wrote:
> > >
> > > Hi Mark,<= br>> > >
> > > > As MPLS SR SIDs are 20 bits, then = rounding up to an octet boundary and a 32 bit alignment,
> > > = > I'd think 32 bit SIDs would be adequate to perform SR in an IPv6 n= etwork.
> > > >
> > > > As 32 bit SIDs are al= so the same size as IPv4 addresses, that may also create some opportunities= to
> > > > leverage IPv4 support in existing protocols to s= uite carrying and processing 32 bit SIDs with some, possibly
> > &= gt; > slight, modification. For example, perhaps IPv4 Address Family sup= port in OSPFv3 (RFC 5838) could be
> > > > somehow leveraged= to suit SR.
> > >
> > >
> > > Thank yo= u for describing your understanding of fundamentals of SR.
> > >= ;
> > > I think SR while indeed started with the story of "= ;less control plane is good for you" now clearly has evolved into not = only reduction of control plane but what can be even more important to some= users ability to request specific behavior via programmed functions of net= work elements on a per flow basis without actually per flow or per path sig= nalling or state.
> > >
> > > Yes for some it may b= e very useful feature and I am sure some will call it overload of data plan= e or . There is no one size fits all.
> > >
> > > W= ith that let's observe that till today SR did not require any new mappi= ng plane to be distributed in control plane and to be inserted into data pl= ane. This is clearly a precedent.
> > >
> > > Furth= ermore as we see in companion documents all additional network functionalit= y is being taken away from SRH and is being shifted to Destination Options = .
> > >
> > > As far as mapping plane I already poi= nted out in my Vector Routing proposal that we have one already it is calle= d BGP. One needs to also observe that we as industry worked number of years= of protocol suite called LISP allowing not only very good mapping plane, b= ut also data plane integration. CC-ing lisp authors for their comments. Not= e also work for integrating SRv6 with LISP which is already is published.> > >
> > > Since you correctly observed that now SI= D can be 32 bit and that is similar to the size of IPv4 my fundamental ques= tion is why not use something which already exists instead of defining some= sort of new=C2=A0 from scratch ?
> > >
> > Robert,> >
> > I don't see in the SRH draft where 32 bit SIDs = are defined. Can you
> > please provide a reference?
> ><= br>>
> To clarify, I've been thinking about the idea of a smal= ler SID size
> for IPv6 for a while now (since inserting EHs came up)= , and thought
> about what would be a generic single size that might = suit SR that
> wasn't the same size as an IPv6 address. 32 bits s= eemed suitable to
> me, although if people wanted bigger, I'd be = suggesting 64 bits (not
> entirely coincidentally the common IID size= .)
>
> Ron and others have written this draft, which supports S= IDS of various
> sizes - 8, 16 or 32 bits - that triggered this discu= ssion.
>
Mark,

Why not just put a SID length field in the header (like RFC6554 but
= more generic). That would allow lengths of 1-16 bytes. Additional
flags = could be used to indicate the semantics of the entries. For
instance, th= ey might be actual addresses (128 bits for IPv6, 32 bits
for IPv4), part= s of addresses (prefixes of suffixes like in RFC6554)
where the rest of = the address can be inferred, indices into a table,
labels, etc.

Tom

> "The IPv6 Compressed Routing Header (CRH)"
> https://tools.ietf.org/html/draft= -bonica-6man-comp-rtg-hdr-03
>
> Regards,
> Mark.
= >
>
> > As for trying to use something that already exist= s, why does SR used a
> > fixed size format for SIDs instead of a = variable length format like
> > that described in RFC6554? Similar= ly, why does SR define it's own TLV
> > format instead of usin= g Hop-by-Hop and Destination Options defined in
> > RFC8200?
&g= t; >
> > Tom
> >
> > > It will be perfectl= y fine to have full proper SRv6 with SRH and LISP or Vector Routing as an a= lternative options. I really do not see a room or need for yet one more map= ping plane. What problem does it solve which would not be already solved el= sewhere ?
> > >
> > > Kind regards,
> > &g= t; Robert
> > >
> > >
> > >>> 2) = Is there an agreement that solutions which require additional per SR path s= tate in both control plane and now in data plane are really something we sh= ould be endorsing here ?
> > >>
> > >>
>= ; > >> I think so.
> > >>
> > >> My = understanding of what SR is fundamentally about is to reduce control plane = state and processing. The trade-off for reduced control plane state and pro= cessing is to instead carry and encode most or all of that information or i= ts semantics as per-packet overhead.
> > >>
> > >= ;> If the per-packet overhead becomes too large and expensive, then push= ing some of that information and processing back into the control plane sho= uld be ok, as long as there is still a beneficial overall reduction in cont= rol plane state and processing.
> > >>
> > >>= As MPLS SR SIDs are 20 bits, then rounding up to an octet boundary and a 3= 2 bit alignment, I'd think 32 bit SIDs would be adequate to perform SR = in an IPv6 network.
> > >>
> > >> As 32 bit S= IDs are also the same size as IPv4 addresses, that may also create some opp= ortunities to leverage IPv4 support in existing protocols to suite carrying= and processing 32 bit SIDs with some, possibly slight, modification. For e= xample, perhaps IPv4 Address Family support in OSPFv3 (RFC 5838) could be s= omehow leveraged to suit SR.
> > >>
> > >> Re= gards,
> > >> Mark.
> > >
> > > ----= ----------------------------------------------------------------
> &g= t; > IETF IPv6 working group mailing list
> > > ipv6@ietf.org=
> > > Administrative Requests: htt= ps://www.ietf.org/mailman/listinfo/ipv6
> > > -------------= -------------------------------------------------------

_______________________________________________
spring mailing list<= br> spr= ing@ietf.org
https://www.ietf.org/mailman/listinfo/spring<= /a>