With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdeFastTimeToLive
Cisco DLSW Fast Time To Live
1.3.6.1.4.1.9.9.74.1.6.1.1.12
The amount of time (in hundredths of a second) remaining before this fast cache entry will be removed from the table. After 5 minutes of inactivity, the fast cache entry will be deleted.
Back to CISCO-DLSW-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cdeFastTimeToLive 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.