With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPInstStatus
Switch MSTP Inst Status
1.3.6.1.4.1.171.12.15.2.3.1.11
The instance state that could be enabled/disabled.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPInstStatus 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.