With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swQinQPortMissDrop
Switch Qin Q Port Miss Dropped
1.3.6.1.4.1.171.12.57.3.1.1.3
This object is used to enable/disable C-VLAN based SP-VLAN assignment miss drop. If missdrop is enabled, the packet that does not match any assignment rule in the Q-in-Q profile will be dropped. If missdrop is disabled, then the packet will be assigned to the PVID of the received port.
Back to Q-IN-Q-MIB MIB page.
IPHost Network monitor allows you to monitor swQinQPortMissDrop 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.