With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
sw8021pColorMapCtrlPortIndex
sw8021p Color Map Control Port Index
1.3.6.1.4.1.171.12.51.3.2.1.1
This object indicates the port number.
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IPHost Network monitor allows you to monitor sw8021pColorMapCtrlPortIndex 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.