With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPMstPortEntry
Switch MSTP Mst Port Entry
1.3.6.1.4.1.171.12.15.2.5.1
A list of information maintained by every port about the MST state for that port.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPMstPortEntry 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.