With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPimCandidateRPRowStatus
Switch Pim Candidate RP Row Status
1.3.6.1.4.1.171.12.52.3.2.4.1.4
The status of this row, by which new entries may be created, or old entries deleted from this table.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swPimCandidateRPRowStatus on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.