With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnSessionExtTable
cvpdn Session Ext Table
1.3.6.1.4.1.9.10.51.1.2.1
Session table includes all Sessions currently active.
Back to CISCO-VPDN-MGMT-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnSessionExtTable 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.