With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDoubleVlanCtrlTable
Switch Double Vlan Control Table
1.3.6.1.4.1.171.12.28.3.1
A table that contains mothod and state about every port.
Back to Double-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swDoubleVlanCtrlTable 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 WiFi routers right now.