With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
caonLastActivateTime
Cisco AON Last Activate Time
1.3.6.1.4.1.9.9.646.1.1.3
This object indicates the local time at the node when the node was last activated from AMC.
Back to CISCO-AON-STATUS-MIB MIB page.
IPHost Network monitor allows you to monitor caonLastActivateTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.