With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSMVlanUntagSourcePort
Switch MSM Vlan Untag Source Port
1.3.6.1.4.1.171.12.64.3.4.1.6
This indicates the untagged member ports to add to the multicast VLAN.
Back to MCAST-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swMSMVlanUntagSourcePort 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 VPN routers right now.