With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
lecMcForwardVpi
LAN Emulation Client Mc Forward Vpi
1.3.6.1.4.1.353.5.3.1.1.11.1.2
The VPI which identifies the Multicast Forward VCC at the point where it connects to the LANE client.
Back to ibm-lec MIB page.
IPHost Network monitor allows you to monitor lecMcForwardVpi on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM switches right now.