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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
Beginning in privileged EXEC mode, follow these steps to configure a restricted VLAN. This procedure
is optional.
To disable and remove the restricted VLAN, use the no dot1x auth-fail vlan interface configuration
command. The port returns to the unauthorized state.
This example shows how to enable VLAN 2 as an IEEE 802.1x restricted VLAN:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# dot1x auth-fail vlan 2
You can configure the maximum number of authentication attempts allowed before a user is assigned to
the restricted VLAN by using the dot1x auth-fail max-attempts interface configuration command. The
range of allowable authentication attempts is 1 to 3. The default is 3 attempts.
Beginning in privileged EXEC mode, follow these steps to configure the maximum number of allowed
authentication attempts. This procedure is optional.
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.
For the supported port types, see the
“IEEE 802.1x Authentication
Configuration Guidelines” section on page 9-13.
Step 3
switchport mode access Set the port to access mode.
Step 4
dot1x port-control auto Enable IEEE 802.1x authentication on the port.
Step 5
dot1x auth-fail vlan vlan-id Specify an active VLAN as an IEEE 802.1x restricted 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 restricted VLAN.
Step 6
end Return to privileged EXEC mode.
Step 7
show dot1x interface interface-id (Optional) Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
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.
For the supported port types, see the
“IEEE 802.1x Authentication
Configuration Guidelines” section on page 9-13.
Step 3
switchport mode access Set the port to access mode.
Step 4
dot1x port-control auto Enable IEEE 802.1x authentication on the port.
Step 5
dot1x auth-fail vlan vlan-id Specify an active VLAN as an IEEE 802.1x restricted 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 restricted VLAN.
Step 6
dot1x auth-fail max-attempts max
attempts
Specify a number of authentication attempts to allow before a port moves
to the restricted VLAN. The range is 1 to 3, and the default is 3.
Step 7
end Return to privileged EXEC mode.