With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
lecMappingEntry
Lan Emulation Client Mapping Entry
1.3.6.1.4.1.353.5.3.1.1.3.1
Each row describes one ifIndex --> lecIndex mapping.
Back to LAN-EMULATION-CLIENT-MIB MIB page.
IPHost Network monitor allows you to monitor lecMappingEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.