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Catalyst 2940 Switch Software Configuration Guide
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Chapter8 Configuring 802.1X Port-Based Authentication
Configuring 802.1X Authentication
To disable AAA, use the no aaa new-model global configuration command. To disable 802.1X AAA
authentication, use the no aaa authentication dot1x {default | list-name} global configuration
command. To disable 802.1X AAA authorization, use the no aaa authorization global configuration
command. To disable 802.1X authentication on the switch, use the no dot1x system-auth-control global
configuration command.
This example shows how to enable AAA and 802.1X on Fast Ethernet port 0/1:
Switch# configure terminal
Switch(config)# aaa new-model
Switch(config)# aaa authentication dot1x default group radius
Switch(config)# dot1x system-auth-control
Switch(config)# interface fastethernet0/1
Switch(config-if)# switchport mode access
Switch(config-if)# dot1x port-control auto
Switch(config-if)# end
Configuring the Switch-to-RADIUS-Server Communication
RADIUS security servers are identified by their host name or IP address, host name 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.
Beginning in privileged EXEC mode, follow these steps to configure the RADIUS server parameters on
the switch. This procedure is required.
Step 9
show dot1x Verify your entries.
Check the Status column in the 802.1X Port Summary section of the
display. An enabled status means the port-control value is set either to
auto or to force-unauthorized.
Step 10
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose