With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDoubleVlanCtrlEntry
Switch Double Vlan Control Entry
1.3.6.1.4.1.171.12.28.3.1.1
A list of mothod type and state for each port.
Back to Double-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swDoubleVlanCtrlEntry 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.