With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pimRPTable
pim RP Table
1.3.6.1.3.61.1.1.5
The (conceptual) table listing PIM version 1 information for the Rendezvous Points (RPs) for IP multicast groups. This table is deprecated since its function is replaced by the pimRPSetTable for PIM version 2.
Back to PIM-MIB MIB page.
IPHost Network monitor allows you to monitor pimRPTable 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.