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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring IEEE 802.1x Port-Based Authentication
Configuring 802.1x Authentication
This example shows how to set 3 as the quiet time on the switch, to set 15 as the number of seconds that
the switch waits for a response to an EAP-request/identity frame from the client before re-sending the
request, and to enable VLAN 2 as an 802.1x guest VLAN when an 802.1x port is connected to a DHCP
client:
Switch(config-if)# authentication timer inactivity 3
Switch(config-if)# authentication timer reauthenticate 15
Switch(config-if)# authentication event no-response action authorize vlan 2
Configuring a Restricted VLAN
When you configure a restricted VLAN on a switch stack or a switch, clients that are
IEEE 802.1x-compliant are moved into the restricted VLAN when the authentication server does not
receive a valid username and password. The switch supports restricted VLANs only in single-host mode.
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 authentication event fail action authorize
vlan-id interface configuration command. The port returns to the unauthorized state.
This example shows how to enable VLAN 2 as an 802.1x restricted VLAN:
Switch(config)# interface gigabitethernet2/0/2
Switch(config-if)# authentication event fail action authorize 2
You can configure the maximum number of authentication attempts allowed before a user is assigned to
the restricted VLAN by using the authentication event retry retry count interface configuration
command. The range of allowable authentication attempts is 1 to 3. The default is 3 attempts.
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 “802.1x Authentication
Configuration Guidelines” section on page 1-39.
Step 3
switchport mode access
or
switchport mode private-vlan host
Set the port to access mode,
or
Configure the Layer 2 port as a private-VLAN host port.
Step 4
authentication port-control auto Enable 802.1x authentication on the port.
Step 5
authentication event fail action
authorize vlan-id
Specify an active VLAN as an 802.1x restricted VLAN. The range is 1 to
4094.
You can configure any active VLAN except an internal VLAN (routed
port), an RSPAN VLAN, a primary private VLAN, or a voice VLAN as
an 802.1x restricted VLAN.
Step 6
end Return to privileged EXEC mode.
Step 7
show authentication interface
interface-id
(Optional) Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
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