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How to determine last time IPSEC SA was established with peer?

I have a cisco ASA with several ipsec peer configurations.  I suspect that a portion of these are obsolete and am going through the cleanup process.  The firewall has been up for over a year so I have a good timeframe of statistics covered, but I cannot figure out a way to show the last time the sa was active.  Any suggestions?

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You would need to setup

You would need to setup syslogging of IPSEC VPN connections to an external server to record a history of the connections.

Hall of Fame Super Silver

Besides what jjohnston

Besides what jjohnston suggested, you could always remark out their cryptomaps and see who complains. :)

It might be good to take his suggestion for a week or two and the communicate to your users that maintenance may affect their VPN connections and be ready to restore them in a moment if need be.

Going forward, it might be useful to give their access-list elements descriptive object-group names so that the connections's idientities are more obvious. I've always disliked how site-site VPN tunnel-groups need to be named after the remote peer IP.

In a previous position when I had occasion to do the same thing I also looked up the peer IP addresses in the whois databases (whois.arin.net and equivalents at RIPE and APNIC etc.). Sometimes that will point you to the remote partner identity

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