PIM MLAG Rendezvous Point Enhancements

Version 33.5.2 adds support for configuring MLAG peers as PIM Rendezvous Points (RP), removing a limitation in multicast deployments.

Issue: Prior to this release, MLAG peers could not be configured as PIM RP (Rendezvous Point), limiting multicast routing design flexibility in high-availability MLAG topologies.

Resolution: MLAG peers can now be configured as PIM RP with full support for Candidate Bootstrap Router (CBSR) and Candidate RP (CRP) roles in PIM Sparse Mode environments.

Key Capabilities:

• MLAG peers can be configured as CBSR (Candidate Bootstrap Router) and CRP (Candidate RP)
• Automatic synchronization of multicast receiver information learned via PIM joins between MLAG peers
• One MLAG peer is elected as BSR/RP while the other serves as backup with candidacy
• Automatic failover: when the elected MLAG peer fails, the backup peer becomes the new BSR/RP
• Supported on Default VR and user-defined VRs

Configuration:

configure pim cbsr vlan <vlan_name>
configure pim crp vlan <vlan_name> <policy>

Both MLAG peers must be configured as CBSR and CRP for the feature to function properly. The existing BSR and RP election mechanisms operate normally in MLAG environments without modification.

Scope:

• Applicable to IPv4 PIM Sparse Mode (SM) only
• Supported in MLAG topologies

Not Applicable For:

• IPv4 PIM Snooping
• IPv4 PIM Dense Mode (DM)
• IPv6 PIM features (any mode)
• W-MLAG topologies

Usage Details: The feature leverages PIM synchronization between MLAG peers to share multicast receiver information learned through PIM joins. This synchronization, implemented as part of the PIM MLAG Transit solution, ensures consistent multicast state across the MLAG pair.

Supported Platforms

All platforms.