With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPimInfoDRPriority
Switch Pim Info DR Priority
1.3.6.1.4.1.171.12.52.2.3.1.7
The DR Priority sets the priority of an IP interface to become the Designated router for the multiple access network. A numerically larger priority is always preferred, yet a lower number represents a higher priority. A router's knowledge of the current DR on an interface can change when a PIM Hello message is received, when a neighbor timers out, or when a router's own DR priority changes.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swPimInfoDRPriority 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.