With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPMstPortInsID
Switch MSTP Mst Port Ins ID
1.3.6.1.4.1.171.12.15.2.5.1.2
This object indicates the MSTP Instance Id(MSTID).
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPMstPortInsID 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 access points right now.