Session Date/Time: 08 Nov 2023 13:30

pim

Summary

The PIM working group meeting covered a wide range of topics, including working group status, document updates, new draft adoptions, and presentations on various multicast-related technologies. Key discussions revolved around PIM light, point-to-multipoint policies, group address allocation protocol (GAAP), zero-configuration multicast address assignment, scalable multicast forwarding using local bitstrings, EVPN integration with PIM, and adaptive tree multicast.

Key Discussion Points

Working Group Status: Three new RFCs published since the last meeting. Working group last call to be initiated for GMP version, MLD version 2, and IIM updates. Review requests emphasized.
PIM Light: Modifications made based on previous IETF feedback. Concerns raised regarding complexity creep and the need to keep PIM Light simple. DF election algorithm from other working groups was referenced as a possible solution.
Point-to-Multipoint Policy: Replication segment draft is in the RFC editor queue. SRV6 support added. Last call requested for the policy draft due to lack of feedback.
GAAP (Group Address Allocation Protocol): Discussed handling of multiple address families (IPv4/IPv6) and ASM/SSM range allocation. Strong disagreement on whether GAAP should support SSM.
Zero-Configuration Multicast Address Assignment: Presented a demo of the MDNS-based solution and discussed the "null and void" port concept for multicast applications.
Scalable Multicast Forwarding: Proposed a method using local bitstrings and sets for more scalable multicast forwarding, potentially addressing issues in large networks with global bitstrings.
EVPN Integration with PIM: Discussed challenges and solutions for integrating PIM with EVPN, including reducing soft state messages and preventing traffic multiplication.
Adaptive Tree Multicast: Presented an adaptive stately tree multicast approach that combined multiple encoding methods.
MP MLD Proxy with Multiple Upstream Interfaces: Proposal to extend existing MP MLD proxies to support multiple upstream interfaces.

Decisions and Action Items

Working Group Last Call: To be initiated for GMP version, MLD version 2, and IIM updates.
Point-to-Multipoint Policy: Working group last call to be initiated after mailing list discussion.
GAAP (Group Address Allocation Protocol): An issue to be opened on the mailing list for further discussion of ASM/SSM support.
Yang Model: The Chair will take it to the list asking for the chairs to ensure its approval.
MP MLD Proxy with Multiple Upstream Interfaces: Bring to the list, and eventually will ask for working group adoption

Next Steps

Authors to address feedback and continue refining drafts.
Further discussion on the mailing list to resolve disagreements and refine proposals.
Explore the potential for hardware implementation and researcher collaboration for scalable multicast solutions.
Coordinate with other working groups (e.g., SPRING, BEER, BEST) as necessary.