With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMacBasedAuthInfoAssignVID
sw Mac Based Authorization Info Assign VID
This object indicates the VID that the port is assigned to once The MAC authentication was successful.
Back to Mac-Based-Authentication-MIB MIB page.
IPHost Network monitor allows you to monitor swMacBasedAuthInfoAssignVID 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 routers right now.