Re: [spring] FW: New Version Notification for draft-bryant-mpls-unified-ip-sr-01.txt

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徐小虎
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产品与解决方案-网络战略与业务发展部

发件人： Adrian Farrel
收件人： spring@ietf.org<mailto:spring@ietf.org>
主题： [spring] FW: New Version Notification for draft-bryant-mpls-unified-ip-sr-01.txt
时间： 2017-08-12 02:47:40

Hi all,

SPRING didn't meet in Prague so I presented this work in MPLS. Bruno suggested
that maybe SPRING would be a better venue.

I'm not sure about that, although I do think both WGs should chat about the
ideas.

The essence of this work is nothing more that MPLS-SR encapsulated in UDP per
RFC 7510. What it achieves is a way to obtain the SR functionality that we all
know and love in an IP network.

The approach is, of course, compatible with MPLS-SR. As the draft says...

   This document makes no changes to the segment routing architecture
   and builds on existing protocol mechanisms such as the encapsulation
   of MPLS within UDP defined in RFC 7510.

   No new procedures are introduced, but existing mechanisms are
   combined to achieve the desired result.

This is not intended to be a beauty contest with SRv6. As the draft says...

   The method defined is a complementary way of running SR in an IP
   network that can be used alongside or interchangeably with that
   defined in [I-D.ietf-6man-segment-routing-header].  Implementers and
   deployers should consider the benefits and drawbacks of each method
   and select the approach most suited to their needs.

Thanks,
Adrian

> ________________________________________
> From: internet-drafts@ietf.org
> Sent: 11 August 2017 19:39:59 (UTC+00:00) Dublin, Edinburgh, Lisbon, London
> To: Stewart Bryant; John E Drake; Adrian Farrel
> Subject: New Version Notification for draft-bryant-mpls-unified-ip-sr-01.txt
>
> A new version of I-D, draft-bryant-mpls-unified-ip-sr-01.txt
> has been successfully submitted by Adrian Farrel and posted to the
> IETF repository.
>
> Name:           draft-bryant-mpls-unified-ip-sr
> Revision:       01
> Title:          A Unified Approach to IP Segment Routing
> Document date:  2017-08-11
> Group:          Individual Submission
> Pages:          16
> URL:
https://www.ietf.org/internet-drafts/draft-bryant-mpls-unified-ip-sr-
> 01.txt
> Status:
https://datatracker.ietf.org/doc/draft-bryant-mpls-unified-ip-sr/
> Htmlized:       https://tools.ietf.org/html/draft-bryant-mpls-unified-ip-sr-01
> Htmlized:
https://datatracker.ietf.org/doc/html/draft-bryant-mpls-unified-ip-
> sr-01
> Diff:
https://www.ietf.org/rfcdiff?url2=draft-bryant-mpls-unified-ip-sr-01
>
> Abstract:
>    Segment routing is a source routed forwarding method that allows
>    packets to be steered through a network on paths other than the
>    shortest path derived from the routing protocol.  The approach uses
>    information encoded in the packet header to partially or completely
>    specify the route the packet takes through the network, and does not
>    make use of a signaling protocol to pre-install paths in the network.
>
>    Two different encapsulations have been defined to enable segment
>    routing in an MPLS network and in an IPv6 network.  While
>    acknowledging that there is a strong need to support segment routing
>    in both environments, this document defines a converged, unified
>    approach to segment routing that enables a single mechanism to be
>    applied in both types of network.  The resulting approach is also
>    applicable to IPv4 networks without the need for any changes to the
>    IPv4 specification.
>
>    This document makes no changes to the segment routing architecture
>    and builds on existing protocol mechanisms such as the encapsulation
>    of MPLS within UDP defined in RFC 7510.
>
>    No new procedures are introduced, but existing mechanisms are
>    combined to achieve the desired result.
>
>
>
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat

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