With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pimRPGroupAddress
pim RP Group Address
1.3.6.1.3.61.1.1.5.1.1
The IP multicast group address for which this entry contains information about an RP.
Back to PIM-MIB MIB page.
IPHost Network monitor allows you to monitor pimRPGroupAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.