With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMLDSnpForbiddenRouterPorts
Switch MLD SNOOPING Forbidden Router Ports
1.3.6.1.4.1.171.12.73.3.2.4.1.15
This indicates the forbidden router port list of the MLD snooping router ports table.
Back to MCAST-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor swMLDSnpForbiddenRouterPorts 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.