Configuring Radius Login Authentication - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 49 Configuring 802.1X Port-Based Authentication
This example shows how to configure host1 as the RADIUS server and to use the default ports for both authentication and
accounting:
Switch(config)# radius-server host host1
You also need to configure some settings on the RADIUS server. These settings include the IP address
Note
of the switch and the key string to be shared by both the server and the switch. For more information,
see the RADIUS server documentation.

Configuring RADIUS Login Authentication

To configure AAA authentication, you define a named list of authentication methods and then apply that list to various ports.
The method list defines the types of authentication to be performed and the sequence in which they are performed; it must be
applied to a specific port before any of the defined authentication methods are performed. The only exception is the default
method list (which, by coincidence, is named default). The default method list is automatically applied to all ports except those
that have a named method list explicitly defined.
A method list describes the sequence and authentication methods to be queried to authenticate a user. You can designate one
or more security protocols to be used for authentication, thus ensuring a backup system for authentication in case the initial
method fails. The software uses the first method listed to authenticate users; if that method fails to respond, the software selects
the next authentication method in the method list. This process continues until there is successful communication with a listed
authentication method or until all defined methods are exhausted. If authentication fails at any point in this cycle—meaning
that the security server or local username database responds by denying the user access—the authentication process stops, and
no other authentication methods are attempted.
To configure login authentication, perform this task. This procedure is required.
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# aaa new-model
Purpose
Enters global configuration mode.
Enables AAA.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Controlling Switch Access with RADIUS
49-105