With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alActiveSessionStartTime
ALTIGA Active Session Start Time
1.3.6.1.4.1.3076.2.1.2.17.2.1.7
The value of sysUpTime when this session was established.
Back to ALTIGA-SESSION-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alActiveSessionStartTime 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.