Setting and verifying the login authentication mode

The following procedure configures TACACS+ as the primary source of authentication and the device-local user database as the secondary source. For complete information on login authentication mode, refer to the aaa authentication login command in the Extreme SLX-OS Command Reference.

In privileged EXEC mode, use the configure terminal command to enter global configuration mode.
```
device# configure terminal
Entering configuration mode terminal
```
Enter the aaa authentication login command with the specified parameters.
```
device(config)# aaa authentication login tacacs+ local
```

Enter the do show running-config aaa command to display the configuration.

device(config)# do show running-config aaa
aaa authentication login tacacs+ local

Log in to the device using an account with TACACS+-only credentials to verify that TACACS+ is being used to authenticate the user.