aaa authentication login default local group radius
radius-server host x.x.x.x auth-port 1812 acct-port 1813
You can also try running debug radius authentication to help identify any issues.
There is no need for anything on the vty lines. You can set
There is no need to setup a key, but you can set one as a best practice
radius-server key 0 thisismykey
Other useful commands are as follow -
ip radius source-interface
If you are connected to your device via telnet and you have turned on radius authentication debugging, type terminal monitor at priv exec mode:
this will redirect the debug (log) messages to your vty session. Once you have done this, start another session and try to authenticate, but do not use the username letmein as you have chosen to do local auth first and radius second, letmein is defined in the local database. Try a username that is not defined locally but is instead configured on your radius server and then watch for the output on the screen to get a clue as to why it is failing.
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