With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsiSessionActiveId
vsi Session Active Id
1.3.6.1.4.1.9.9.162.1.2.1.11
ID supplied by the slave to identify the session. This value is interpreted by the master, when a change occurs, to indicate that a resync should be inititated.
Back to CISCO-VSIMASTER-MIB MIB page.
IPHost Network monitor allows you to monitor vsiSessionActiveId 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.