With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cikeTunHistInP2SaDelRequests
Cisco IKE Tunnel History In P2 Sa Del Requests
1.3.6.1.4.1.9.9.171.1.4.2.1.1.30
The total number of IPsec Phase-2 security association delete requests received by this IPsec Phase-1 IKE Tunnel.
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IPHost Network monitor allows you to monitor cikeTunHistInP2SaDelRequests on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.