With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPPortTable
Switch MSTP Port Table
1.3.6.1.4.1.171.12.15.2.4
A table that contains port-specific information for the Spanning Tree Protocol.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPPortTable 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 IP cameras right now.