With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPimCandidateRPWildcardPrefixCnt
Switch Pim Candidate RP Wildcard Prefix Сounter
1.3.6.1.4.1.171.12.52.3.2.3
The number of enocded group addresses included in the message; indicating the group prefixes for which the C-RP is advertising. A Prefix-Cnt of '0' implies a prefix of 224.0.0.0 with mask length of 4; i.e. all multicast groups. If the C-RP is not configured with Group-prefix information, the C-RP puts a default value of '0' in this field.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swPimCandidateRPWildcardPrefixCnt 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.