You can enable PIM dual designated router mode for a pair of Multichassis Link Aggregation Group (MC-LAG) peers managing VLAN multicast traffic and Layer 3 multicast traffic over IRB interfaces.
PIM dual designated router mode sets up one device in a pair of MC-LAG peers as a primary designated router (DR), and the other device as a standby or backup DR for redundancy in managing multicast packet forwarding. Both devices join the multicast forwarding tree and receive multicast traffic. If the primary device fails, the standby device quickly takes over forwarding multicast packets with minimal traffic disruption.
