With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiCircLastUpTime
Cisco IS-IS Circ Last Up Time
1.3.6.1.4.1.9.10.118.1.3.2.1.13
If the circuit is enabled, the value of sysUpTime when ciiCircAdminState most recently entered the state 'on'. If the circuit is not 'on', the value of sysUpTime when the circuit last entered state 'on', 0 if the circuit has never been 'on'.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiCircLastUpTime 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.