Crypto Map Madness – Cisco High Availability Solution: Stateful Failover for IPsec

Stateful Failover for IP Security (IPsec) allows a router to continue processing and forwarding IPsec packets after a planned or unplanned outage occurs. A backup (secondary) router automatically takes over the tasks of the active (primary) router if the active router loses connectivity for any reason. This process is transparent to the user and requires neither adjustment nor reconfiguration of any remote peer.

It should be transparent but due to the nature of the configuration we had to apply the Stateful Failover to the Standby.