With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swProtocolVLANIndex
Switch Protocol VLAN Index
1.3.6.1.4.1.171.12.16.1.1.1.1
A value that identifies this SwProtocolVLANEntry.
Back to SWPROTOCOLVLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swProtocolVLANIndex 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.