Auto-RP
Auto-RP automates the discovery of RPs in a sparse or sparse-dense PIM
network. RPs advertise themselves to a router designated as an RP mapping
agent. The mapping agent then decides on one RP per group and sends that
information to the other routers.
To configure a router as an RP, type the following:
(config)# ip pim send-rp-announce type number scope ttl
group-list access-list-number
To configure a router as a mapping agent, type the following:
(config)# ip pim send-rp-discovery scope ttl