With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL3SwPimRegChksumIncDataRpAddr
Switch L3 Software Pim Reg Chksum Inc Data Rp Address
1.3.6.1.4.1.171.12.52.3.5.1.1
Specifies the RP address.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swL3SwPimRegChksumIncDataRpAddr 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.