PIM multicast routing

Bidirectional PIM is a variant of PIM-SM that builds bidirectional shared trees connecting multicast sources and receivers.

DF election process

Bidirectional trees are built using a Designated Forwarder (DF) election process operating on each link of the multicast topology. With the assistance of the DF, multicast data is forwarded from sources to the Rendezvous Point (RP) and then along the shared tree to receivers. This process does not require source-specific state. The DF election takes place during RP discovery and provides a default route to the RP.

Note	If the Firewall Threat Defense device is the PIM RP, use the untranslated outside address of the Firewall Threat Defense device as the RP address.