With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swBpduProtectionPortStatus
Switch Bpdu Protection Port Status
1.3.6.1.4.1.171.12.76.3.1.1.4
This object indicates the port status.
Back to BPDU-PROTECTION-MIB MIB page.
IPHost Network monitor allows you to monitor swBpduProtectionPortStatus 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.