Version 33.5.1 introduces expanded support for Protocol Independent Multicast (PIM) in MLAG topologies, addressing previous limitations and improving multicast routing behavior across both default and user-created VRs.
Enhancements include:
PIM RP Support on MLAG Peer Switches: PIM Rendezvous Point (RP) can now be configured on MLAG peers, enabling redundancy and more flexible multicast routing designs.
PIM JOIN Forwarding over MLAG Links: PIM JOIN messages received on MLAG ports are now checkpointed and synchronized between MLAG peers, ensuring consistent receiver state and enabling correct traffic forwarding.
IGMP JOIN Forwarding over MLAG Links: IGMP JOINs continue to be supported over MLAG links, with receiver information synchronized using IGMP Sync.
PIM MLAG Transit Support: Synchronization of multicast receiver state learned using PIM JOINs is now supported across MLAG transit peers. This resolves forwarding inconsistencies where only one peer previously learned receiver state. The enhancement applies to both default and user-defined VRs and leverages existing PIM checkpointing mechanisms with new message types. No CLI configuration is required to activate the feature.
These enhancements improve multicast resiliency and consistency in MLAG deployments and are automatically applied on supported platforms.
All platforms.