With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPimCandidateRPPriority
Switch Pim Candidate RP Priority
1.3.6.1.4.1.171.12.52.3.2.2
This value determines the priority of a CRP to become the RP for the distribution tree. A lower value denotes a higher priority. If there is a tie for priority, the device with the highest IP address will become the RP. This information is stored in the BSR, along with the RP address and corresponding encoded group address.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swPimCandidateRPPriority 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 access points right now.