With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpimExtRPSetRPActive
cpim Ext RP Set RP Active
1.3.6.1.4.1.9.10.120.1.1.7.1.11
Evaluates to 'true' if the RP in this entry is the currently active RP for the group-range.
Back to CISCO-IETF-PIM-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cpimExtRPSetRPActive 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.