With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDoubleVlanUplinkPorts
Switch Double Vlan Uplink Ports
1.3.6.1.4.1.171.12.28.3.1.1.4
This object indicates the port list that are connected to the service provider VLANs(tag-port). Only gigabit ports can be chose.When the double vlan is disabled, the port list is NULL.
Back to Double-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swDoubleVlanUplinkPorts 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.