To set the authentication and encryption
key for all RADIUS communications between the router and the RADIUS daemon,
use the radius-server key global configuration command. Use the no
form of this command to disable the key.
Usage Guidelines
After enabling AAA authentication with the
aaa new-model command, the authentication and encryption key must be set using the
radius-server key command.
The key entered must match the key used on
the RADIUS daemon. All leading spaces are ignored, but spaces within and at
the end of the key are used. If spaces are used in the key, do not enclose the key in quotation marks unless the quotation marks themselves are part of the key.