Configure Preshared Keys
Suppose your security policy dictates that you use preshared keys for authentication and you issue the following command:
Router(config-isakmp)# authentication pre-share
You must configure a preshared key. The command syntax to configure a preshared key is
Router(config)# crypto isakmp key keystring address remote-peer-address Router(config)# crypto isakmp key keystring hostname remote-peer-hostname
Make sure you use the same router identity as you did with the command crypto isakmp identity. The keystring can be up to 128 bytes and can consist of alphanumeric characters.
If your remote IPSec peer has already been configured with a preshared key of CiscO_123! and the peer will be using its hostname to authenticate, ...
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