make sure you know the passwords associated with the 'password' and 'enable password' commands.
Make sure you have defined administrative access via telnet or ssh as well (i'm assuming this part is done already).
remove the appropriate 'aaa authentication telnet/ssh...' command.
Once you do that, you've removed radius from administrative access. Test it BEFORE you log out by opening another ssh/telnet session.
Once you successfully tested it, remove the aaa-server commands and keys.
