DELL N3000 User Manual

Managing IPv4 and IPv6 Multicast

candidate RPs to all the PIM routers in the network. Each PIM router then 

runs the RP selection algorithm to determine an RP for the given group 

range. All the interested PIMSM routers then initiate re-reception of traffic 

through this new RP, and the multicast traffic is rerouted via the new RP. This 

is to provide high availability to the multicast applications and help ensure 

that the multicast traffic is recovered quickly in such scenarios.

This section describes the workings of PIM-SM protocol per RFC 4601. The 

protocol operates essentially in three phases, as explained in the following 

sections.

• In this example, an active receiver (attached to leaf router at the bottom of 

the drawing) has joined multicast group “G”.

• The leaf router (labeled DR above) knows the IP address of the 

Rendezvous Point (RP) for group G and sends a (*, G) Join for this group 

towards the RP.