With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPInstExternalRootCost
Switch MSTP Inst External Root Cost
1.3.6.1.4.1.171.12.15.2.3.1.14
The path cost between MST Regions from the transmitting Bridge to the CIST Root. For MST instance this object is unused.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPInstExternalRootCost 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 VPN routers right now.