With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPInstRemainHops
Switch MSTP Inst Remain Hops
1.3.6.1.4.1.171.12.15.2.3.1.23
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IPHost Network monitor allows you to monitor swMSTPInstRemainHops 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.