TACACS+ Commands

Terminal Access Controller Access-Control System Plus (TACACSClosed Terminal Access Controller Access Control System+, usually pronounced like tack-axe) is an access control network protocol for network devices.

The differences between RADIUSClosed Remote Authentication Dial-In User Service and TACACS+ can be summarized as follows:

RADIUS combines authentication and authorization in a user profile, while TACACS+ provides separate authentication.
RADIUS encrypts only the password in the access-request packet sent from the client to the server. The remainder of the packet is unencrypted. TACACS+ encrypts the entire body of the packet but leaves a standard TACACS+ header.
RADIUS uses UDPClosed User Datagram Protocol, while TACACS+ uses TCP.
RADIUS is based on an open standard (RFC 2865). TACACS+ is proprietary to Cisco, although it is an open, publicly documented protocol (there is no RFC protocol specification for TACACS+).
 
Only network administrators can execute these commands. For more, see the username command.
The commands below are supported only on the “management” VRFClosed Virtual Routing and Forwarding.

This chapter contains these commands: