Cisco Systems 3750E manual Configuring the Switch-to-RADIUS-Server Communication, 10-26

Chapter 10 Configuring IEEE 802.1x Port-Based Authentication

Configuring IEEE 802.1x Authentication

Beginning in privileged EXEC mode, follow these steps to configure IEEE 802.1x port-based authentication:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	aaa new-model	Enable AAA.
Step 3
	aaa authentication dot1x {default}	Create an IEEE 802.1x authentication method list.
	method1	To create a default list that is used when a named list is not specified in
		the authentication command, use the default keyword followed by the
		method that is to be used in default situations. The default method list is
		automatically applied to all ports.
		For method1, enter the group radius keywords to use the list of all
		RADIUS servers for authentication.
		Note Though other keywords are visible in the command-line help
		string, only the group radius keywords are supported.
Step 4
	dot1x system-auth-control	Enable IEEE 802.1x authentication globally on the switch.
Step 5
	aaa authorization network {default}	(Optional) Configure the switch to use user-RADIUS authorization for all
	group radius	network-related service requests, such as per-user ACLs or VLAN
		assignment.
		Note For per-user ACLs, single-host mode must be configured. This
		setting is the default.
Step 6
	radius-server host ip-address	(Optional) Specify the IP address of the RADIUS server.
Step 7
	radius-server key string	(Optional) Specify the authentication and encryption key used between
		the switch and the RADIUS daemon running on the RADIUS server.
Step 8
	interface interface-id	Specify the port connected to the client that is to be enabled for
		IEEE 802.1x authentication, and enter interface configuration mode.
Step 9
	switchport mode access	(Optional) Set the port to access mode only if you configured the RADIUS
		server in Step 6 and Step 7.
Step 10
	dot1x port-control auto	Enable IEEE 802.1x authentication on the port.
		For feature interaction information, see the “IEEE 802.1x Authentication
		Configuration Guidelines” section on page 10-23.
Step 11
	end	Return to privileged EXEC mode.
Step 12
	show dot1x	Verify your entries.
Step 13
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Configuring the Switch-to-RADIUS-Server Communication

RADIUS security servers are identified by their hostname or IP address, hostname and specific UDP port numbers, or IP address and specific UDP port numbers. The combination of the IP address and UDP port number creates a unique identifier, which enables RADIUS requests to be sent to multiple UDP ports on a server at the same IP address. If two different host entries on the same RADIUS server are configured for the same service—for example, authentication—the second host entry configured acts as the fail-over backup to the first one. The RADIUS host entries are tried in the order that they were configured.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
10-26	OL-9775-02