这个是Susan向SPRING和IDR工作组寻求这篇文稿提出的关于复合候选路径只限制BGP来源是否合理的问题解答。

1) Can composite SR Candidate Paths be limited to be created from only explicit 
(aka Static) BGP SR Candidate path?

  *   If so, how is it done (technically)?
  *   What text should be found in draft-jiang-idr-sr-policy-composite-path-04 
on this limited?
  *   Is it there?

2) Is the limitation of composite path to specific BGP sources an appropriate 
use of the composite concept from SPRING?

3) How does this interact with the PCE composite CPs?

发件人: Susan Hares <[email protected]>
发送时间: 2026年7月11日 0:09
收件人: 'SPRING WG' <[email protected]>; idr@ietf. org <[email protected]>
主题: [spring] [BGP-SR-TE] Request for information - prior to adoption call for 
draft-jiang-idr-sr-policy-composite-path


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Greetings Spring and IDR:

Please note that IPR may exist for this technology.  If you are participating 
in this discussion and know of IPR, please see the IETF IPR rules.

The authors of draft-jiang-idr-sr-policy-composite-path-04 have requested WG 
LC.  During IETF-125, I spent a lengthy time discussing the issues of creating 
BGP routes from any dynamic source (e.g. IGP).  The authors indicated that 
these BGP composite paths would come from explicit SR Policy Candidate 
Policies, which are statically configured.

This document’s abstract states:

   SR Policy Architecture [RFC9256] defines the concept of a Composite
   Candidate Path. A regular SR Policy Candidate Path outputs traffic
   to a set of Segment Lists, while an SR Policy Composite Candidate
   Path outputs traffic recursively to a set of SR Policies on the same
   headend. This document defines extensions to BGP to distribute SR
   policies carrying composite candidate path information. So that
   composite candidate paths can be installed when the SR policy is
   applied.

The authors have indicated that the source for the composite policy would be 
BGP explicit SR Candidate Paths.

The SR policy in the composite path can be distributed
   by BGP as described in [RFC9830], by PCEP as described in [RFC
   9862], or through static configuration.

I have 3 groups of questions as the shepherd for this draft:

1) Can composite SR Candidate Paths be limited to be created from only explicit 
(aka Static) BGP SR Candidate path?

  *   If so, how is it done (technically)?
  *   What text should be found in draft-jiang-idr-sr-policy-composite-path-04 
on this limited?
  *   Is it there?

2) Is the limitation of composite path to specific BGP sources an appropriate 
use of the composite concept from SPRING?

3) How does this interact with the PCE composite CPs?

Cheerily, Sue Hares

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