With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
lecMacAddress
Lan Emulation Client Mac Address
1.3.6.1.4.1.353.5.3.1.1.7.1.1
A unicast MAC address which the LE client denoted by 'lecIndex' has registered with its LE Server.
Back to LAN-EMULATION-CLIENT-MIB MIB page.
IPHost Network monitor allows you to monitor lecMacAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.