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When you configure IKE on a device that supports IKEv2, you have the option of configuring either version alone, or both versions together. When the device attempts to negotiate a connection with another peer, it uses whichever versions you allow and that the other peer accepts. If you allow both versions, the device automatically falls back to the other version if negotiations are unsuccessful with the initially chosen version (IKEv2 is always tried first if it is configured). Both peers must support IKEv2 to use it in a negotiation.
With IKEv1 policies, for each parameter, you set one value. For IKEv2, you can configure multiple encryption, integrity, PRF, and Diffie-Hellman options. The ASA orders the settings from the most secure to the least secure and negotiates with the peer using that order. This allows you to potentially send a single proposal to convey all the allowed transforms instead of the need to send each allowed combination as with IKEv1.
If you select AES encryption, to support the large key sizes required by AES, ISAKMP negotiation should use Diffie-Hellman (DH) Group 5 or higher. ASA devices support groups 1, 2, and 5 only, and these are the only groups available for IKEv2.
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