Stub multicast routing

When configured for stub multicast routing, the Firewall Threat Defense device acts as an IGMP proxy agent. Instead of fully participating in multicast routing, the Firewall Threat Defense device forwards IGMP messages to an upstream multicast router, which sets up delivery of the multicast data. When configured for stub multicast routing, the Firewall Threat Defense device cannot be configured for PIM sparse or bidirectional mode. Enable PIM on the interfaces that participate in IGMP stub multicast routing.

The Firewall Threat Defense device supports both PIM-SM and bidirectional PIM. PIM-SM is a multicast routing protocol that uses the underlying unicast routing information base or a separate multicast-capable routing information base. It builds unidirectional shared trees, each rooted at a single Rendezvous Point (RP) per multicast group. Optionally, it creates shortest-path trees for each multicast source.