With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alpsRemPeerUptime
Cisco's Airline protocol support Remote Peer Uptime
1.3.6.1.4.1.9.9.95.1.2.2.1.6
Time elapsed since TCP connection was established.
Back to CISCO-ALPS-MIB MIB page.
IPHost Network monitor allows you to monitor alpsRemPeerUptime 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.