With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipSecTunLifeSize
Cisco IPSec Sec Tunnel Life Size
1.3.6.1.4.1.9.9.171.1.3.2.1.8
The negotiated LifeSize of the IPsec Phase-2 Tunnel in kilobytes.
Back to CISCO-IPSEC-FLOW-MONITOR-MIB MIB page.
IPHost Network monitor allows you to monitor cipSecTunLifeSize on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.