With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pimRPSetAddress
pim RP Set Address
1.3.6.1.3.61.1.1.6.1.3
The IP address of the Candidate-RP.
Back to PIM-MIB MIB page.
IPHost Network monitor allows you to monitor pimRPSetAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.