Explanation Command Default Accounting port: 1813 Authentication port: 1812 Accounting: enabled Authentication: enabled Retransmission count: 1 Idle-time: 0 Server monitoring: disabled Timeout: 5 seconds Test username: test Test password: test Reference: https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/n5k/commands/radius-server-host.html By default, RADIUS uses UDP port 1812 for authentication and port 1813 for accounting. In the exhibit above we see port 1814 is being used for authentication to AAA server at 10.1.1.1 which is not the default port so we must adjust the authentication port to the default value 1812.