Hi, Bruno.
Thanks for the draft. It's helpful to aggregate SIDs based on prefixes in
an SR-MPLS network.
I have a few questions regarding this draft:
-In section 5, should the signaling direction be in the reversing order?
(I may have missed something here)
Ex: in section 5.1:
-For the aggregation segment (192.0.2/24):
PE2.3 => P2 => ABR2 => P0 => ABR1
-For the specific segment toward PE2.x:
PE2.3 => P2 => ABR2 => P0 => ABR1 => P1 => PE1
-This may be a little bit out of the scope of this draft. If there are
multiple aggregation segment advertisements with different label-related
parameters(Sub-TLVs), how should we deal with them? Should we only use ones
that include the reachability to the egress PE as ECMP legs or ignore
aggregation segments with inconsistent parameters altogether?
Many thanks!
Nat
On Tue, Mar 4, 2025 at 4:30 AM <bruno.decra...@orange.com> wrote:
> [obviously speaking as individual contributor]
>
> Hi all,
>
> We have just published a short draft.
> It introduces an Aggregation Segment for Segment Routing with MPLS data
> plane.
> This can be used to aggregate IP prefixes along with their SR Prefix
> Segments. Aggregation Segments enable aggregation of IP prefixes to be
> performed at border routers to improve scalability of MPLS networks.
>
> We would appreciate your review and comments.
>
> Thanks,
>
> --Shraddha, Ketan, Kamran, Bruno
>
> -----Original Message-----
> From: internet-dra...@ietf.org <internet-dra...@ietf.org>
> Sent: Monday, March 3, 2025 5:18 PM
> To: DECRAENE Bruno INNOV/NET <bruno.decra...@orange.com>; Kamran Raza <
> skr...@cisco.com>; Ketan Talaulikar <ketant.i...@gmail.com>; Shraddha
> Hegde <shrad...@juniper.net>; Syed Raza <skr...@cisco.com>
> Subject: New Version Notification for
> draft-decraene-spring-sr-mpls-aggregation-segment-00.txt
>
>
> A new version of Internet-Draft
> draft-decraene-spring-sr-mpls-aggregation-segment-00.txt has been
> successfully submitted by Bruno Decraene and posted to the IETF repository.
>
> Name: draft-decraene-spring-sr-mpls-aggregation-segment
> Revision: 00
> Title: SR-MPLS Aggregation Segment
> Date: 2025-03-03
> Group: Individual Submission
> Pages: 9
>
>
> https://www.ietf.org/archive/id/draft-decraene-spring-sr-mpls-aggregation-segment-00.html
>
> Abstract:
>
> One of the key features of IP that has helped IP Routing to scale is
> aggregation of IP prefixes. This is made possible with longest-match
> lookup in IP forwarding. Contrary to this, MPLS forwarding works on
> exact match on MPLS labels. This poses a challenge in aggregation of
> IP prefixes when the forwarding is based on the MPLS labels
> associated with those IP prefixes.
>
> This document introduces an Aggregation Segment for Segment Routing
> with MPLS data plane which can be used to aggregate IP prefixes along
> with their SR Prefix Segments. Aggregation Segments enable
> aggregation of IP prefixes to be performed at border routers to
> improve scalability of MPLS networks.
>
>
>
> The IETF Secretariat
>
>
>
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