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Catalyst2950 Desktop Switch Software Configuration Guide
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Chapter7 Administering the Swi tc h Controlling Switch Access with TACACS+

Logging into and Exiting a Privilege Level

Beginning in privileged EXEC mode, follow these steps to log in to a specified privilege level and to exit
to a specified privilege level:
Controlling Switch Access with TACACS+
This section describes how to enable and configure Terminal Access Controller Access Control System
Plus (TACACS+), which provides detailed accounting information and flexible administrative control
over authentication and authorization processes. TACACS+ is facilitated through authentication,
authorization, accounting (AAA) and can be enabled only through AAA commands.
Note For complete syntax and usage information for the commands used in this section, refer to the Cisco IOS
Security Command Reference for Release 12.1.
This section contains this configuration information:
•Understanding TACACS+, page 7-9
•TACACS+ Operation, page 7-11
•Configuring TACACS+, page 7-11
•Displaying the TACACS+ Configuration, page 7-16

Understanding TACACS+

TACACS+ is a security application t hat provides centraliz ed validat ion of users attempting to g ain access
to your switch. TACACS+ services are maintained in a database on a TACACS+ daemon typically
running on a UNIX or Windows NT workstation. You should have access to and should configure a
TACACS+ server before the configuring TACACS+ features on your switch.
TACACS+ provides for separate and modular authentication, authorization, and accounting facilities.
TACACS+ allows for a single access control server (the TACACS+ daemon) to provide each
service—authentication, authorization, and accounting—independently. Each service can be tie d into its
own database to take advantage of other services available on that server or on the network, depe nding
on the capabilities of the daemon.
The goal of TACACS+ is to provide a method for managing multip le network access points fr om a single
management service. Your switch can be a network access server along with other Cisco routers a nd
access servers. A network access server provides connections to a single user, to a network or
subnetwork, and to interconnected networks as shown in Figure 7-1.
Command Purpose
Step1 enable level Log in to a specified privilege level.
For level, the range is 0 to 15.
Step2 disable level Exit to a specified privilege level.
For level, the range is 0 to 15.