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ASA Site-to-Site VPN Failover “Preemption”

As we know, Cisco ASA IPsec site-to-site VPN preemption is not supported on Cisco ASA. Therefore, this means if the primary VPN peer recovers from a failure the VPN tunnel will remain active with the secondary VPN peer. In other words, if you configure a site-to-site VPN tunnel crypto map with two peers, one as the primary, and another as the secondary, the ASA will always try to initiate the tunnel with the primary peer first. If the primary peer fails and become unreachable, then the ASA will initiate the tunnel with the secondary peer.

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