How to router TACACS authentication with loopback 0 interface

If you are using TACACS server and dedicated management network (IP), you might have loopback 0 interface on each devices that you are managing.

As you know, source IP address during TACACS authentication will be vary.

Here is the way you can isolate TACACS source IP address from your device during TACACS authentication.

Cisco_Router# conf t
Cisco_Router(config)# ip tacacs source-interface Loopback0

Warning~

* Make sure AAA TACACS configuration is already configured and the TACACS server is reachable.
** If you are changing from remote, it will be hang few minutes after applied the command, be patient~