With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccl2vpnMacVpnIdL2vpnIndexTable
Cisco Cable L2VPN Mac Vpn Id L2vpn Index Table
1.3.6.1.4.1.9.9.700.1.1
Every L2VPN provisioned Cable Modem can be a part of multiple VPNs and the CMTS assigns a L2vpnIndex for each {Cable Modem MAC address, VPN-id} pair. This table maps {Cable Modem MAC address, VPN-id} to the L2vpnIndex.
Back to CISCO-CABLE-L2VPN-MIB MIB page.
IPHost Network monitor allows you to monitor ccl2vpnMacVpnIdL2vpnIndexTable 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.
