With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL2STPPortState
Switch L2 STP Port State
1.3.6.1.4.1.171.11.70.5.2.16.4.1.14
The enabled/disabled status is usedoop-back prevention attached to this port.
Back to DES3026-L2MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL2STPPortState 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 switches right now.