ip pim accept-rp

From CCO

http://www.cisco.com/en/US/docs/ios/12_2/ipmulti/command/reference/1rfmult2.html#wp1019380

ip pim accept-rp

To configure a router to accept join or prune messages destined for a specified rendezvous point (RP) and for a specific list of groups, use the ip pim accept-rp command in global configuration mode. To remove that check, use the no form of this command.

rp-address

RP address of the RP allowed to send join messages to groups in the range specified by the group access list.