With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pimCandidateRPGroupMask
pim Candidate RP Group Mask
1.3.6.1.3.61.1.1.11.1.2
The multicast group address mask which, when combined with pimCandidateRPGroupMask, identifies a group prefix for which the local router will advertise itself as a Candidate-RP.
Back to PIM-MIB MIB page.
IPHost Network monitor allows you to monitor pimCandidateRPGroupMask 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.