Session Date/Time: 05 Nov 2024 09:30

rtgwg

Summary

The RTGWG meeting at IETF 121 in Dublin covered several key topics, including rechartering the working group, updates on various drafts related to TI-LFA, BGP PIC, microloop avoidance, destination source routing, and AI networking. There were also presentations on new drafts concerning in-network congestion notification and adaptive routing framework. The meeting focused on refining existing drafts, discussing terminology, addressing comments, and exploring potential future work.

Key Discussion Points

Rechartering: The working group is formalizing ongoing work in areas such as satellite routing, routing in data centers, and networking in AI clusters. Feedback on the recharter is requested.
TI-LFA Draft: Discussions centered on the use of "should" and "key" keywords, specifically regarding whether following the post-convergence path is mandatory. It needs clarification.
BGP PIC Draft: There was a discussion about terminology consistency with existing BGP specifications, and whether new terms are ambiguously defined.
Microloop Avoidance Draft: Questions were raised about the document's purpose, whether it introduces new interoperability extensions, and its relationship to existing RFCs.
Destination Source Routing: The discussion point was around including end-host destination source routing.
Pass-Aware Remote Protection: The discussion focused on the limitations of the current version on network architecture and why the failure notification protocol is BGP independent.
Application and Network Collaboration: Scenarios were presented highlighting the importance of collaboration between applications and networks. The working group chair emphasized that future presentations should focus on work relevant to the working group.
Routing in Computing Cluster Networks: The potential of hybrid routing approaches, combining distributed and centralized routing, was explored. The use of IGP in data centers was suggested as an alternative to BGP.
In-Network Congestion Notification: It's a zero version draft. The document is about congestion notification between nodes instead of link failures.
Adaptive Routing Framework: An adaptive routing framework that aims to address load imbalances in AI networks was presented.
Generalized IPv6 Tunnel: Draft intended to propose a more feature-proof and efficient mechanism by which to transport the advanced features within IPV6 headers.
Fast Link State Advertisement: Proposed draft defines a link state advertisement protocol to notify the congestion status of the link.

Decisions and Action Items

TI-LFA Draft:
- Ahmed will work with Jim Guichard and John to resolve the "key" keyword discussion, including adding statements about why congruence may not be mandatory due to hardware limitations.
- Address Stuart and Sasha's comments about re-evaluating whether the repair path has to be post-converged or provide clear justification for not requiring it.
BGP PIC Draft:
- Ahmed will send Jim Guichard a list of terms that are causing concern to aid in the review.
Microloop Avoidance Draft:
- Authors need to reference to existing RFCs and drafts that are more mature than the document to justify any of the key cases.
Pass-Aware Remote Protection:
- Authors need to address the points in the document about a three-level network, BGP correlation and the necessity of router ID loopback.
Fast Link State Advertisement:
- Authors need to think about topologies that have a super spine.

Next Steps

Authors of drafts to address comments and feedback received during the meeting and on the mailing list.
Further discussion on the rechartering document on the mailing list.
AIDC side meeting to be held on Thursday at 3 p.m.