<p>
RP selection happens. Candidate-RPs sends announce messages to multicast address 224.0.1.39. Rp-mapping agent is listenning for the address and determine that the Candidate-RP with the highest RP address is the RP in the multicast domain.Mapping agent then tell every pim router the RP using discovery message,with destination address 224.0.1.40.All pim routers in the multicast domain is listening for the address.</p>