With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPInstDesignatedRootBridge
Switch MSTP Inst Designated Root Bridge
1.3.6.1.4.1.171.12.15.2.3.1.13
The bridge identifier of the CIST. For MST instance, this object is unused.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPInstDesignatedRootBridge 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.