dynamips lab:Cisco high availability IPSec VPN on dynamips(loopback address)
In the lab, both access link IP addresses are configured on R1 as IKE identities of R2. When R1 initiates IKE negotiation, the first peer IP address is used by IKE and becomes R2′s IKE identity for this peer. If this IKE SA times out during the negotiation, the second IP address becomes the IKE identity of the R2.

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