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9-27
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 9 Configuring IEEE 802.1x Port-Based Authentication
Configuring IEEE 802.1x Authentication
Configuring NAC Layer 2 IEEE 802.1x Validation
In Cisco IOS Release 12.1(22)EA6 or later, you can configure NAC Layer 2 IEEE 802.1x validation,
which is also referred to as IEEE 802.1x authentication with a RADIUS server.
Beginning in privileged EXEC mode, follow these steps to configure NAC Layer 2 IEEE 802.1x
validation. The procedure is optional.
Note On Catalyst 2950 LRE switches, you cannot configure IEEE 802.1x authentication using a RADIUS
server.
This example shows how to configure NAC Layer 2 IEEE 802.1x validation:
Switch# configure terminal
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# dot1x reauthentication
Switch(config-if)# dot1x timeout reauth-period server
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to be configured, and enter interface configuration mode.
Step 3
dot1x guest-vlan vlan-id Specify an active VLAN as an IEEE 802.1x guest VLAN. The range is 1
to 4094.
You can configure any active VLAN except an RSPAN VLAN or a voice
VLAN as an IEEE 802.1x guest VLAN.
Step 4
dot1x reauthentication Enable periodic re-authentication of the client, which is disabled by
default.
Step 5
dot1x timeout reauth-period {seconds |
server}
Set the number of seconds between re-authentication attempts.
The keywords have these meanings:
• seconds—Sets the number of seconds from 1 to 65535; the default is
3600
seconds.
• server—Sets the number of seconds as the value of the
Session-Timeout RADIUS attribute (Attribute[27]) and the
Termination-Action RADIUS attribute (Attribute [29]).
This command affects the behavior of the switch only if periodic
re-authentication is enabled.
Step 6
end Return to privileged EXEC mode.
Step 7
show dot1x interface interface-id Verify your IEEE 802.1x authentication configuration.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.