> # About IKE Tunnels

> An IKE tunnel is a secure IKE session between two endpoints. IKE creates this tunnel to protect IKE messages used in IPsec SA negotiations.

> Two versions of IKE are used in the Cisco NX-OS implementation.

> - IKE version 1 (IKEv1) is implemented using RFC 2407, 2408, 2409, and 2412.
> - IKE version 2 (IKEv2) is a simplified and more efficient version and does not interoperate with IKEv1. IKEv2 is implemented using the draft-ietf-ipsec-ikev2-16.txt draft.

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