With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDoubleVlanUnknowPorts
Switch Double Vlan Unknow Ports
1.3.6.1.4.1.171.12.28.3.1.1.6
When the double vlan is disabled, this object indicates the port list that are connect to the provider or customer VLANs in 802.1q. When the double vlan is enabled, the port list is NULL.
Back to Double-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swDoubleVlanUnknowPorts 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.
