Enable TACACS+ globally on the switch.
The switch supports the TACACS+ client. TACACS+ is a security application implemented as a client and server-based protocol that provides centralized validation of users who attempt to gain access to a router or network access server (the switch).
By default, TACACS+ is disabled.
You must have access to and you must configure a TACACS+ server before the TACACS+ features on your switch are available.
Switch:1>enable Switch:1#configure terminal Switch:1(config)#tacacs protocol enable