With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
appnLsActiveTime
appn Link Station Active Time
1.3.6.1.2.1.34.4.1.1.5.1.1.32
The cumulative amount of time since the node was last reinitialized, measured in hundredths of a second, that this link station has been in the active state. A zero value indicates that the link station has never been active since the node was last reinitialized.
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IPHost Network monitor allows you to monitor appnLsActiveTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.