With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
fdbVpi
fdb Vpi
1.3.6.1.4.1.3646.1300.2.1.9.1.2
The VPI value of the VCL. The maximum VPI value cannot exceed the value allowable by the atmInterfaceMaxVpiBits.
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IPHost Network monitor allows you to monitor fdbVpi 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.