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Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
OL-26520-01
Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Configuring 802.1x Authentication
Configuring a Restricted VLAN
When you configure a restricted VLAN on a switch stack or a switch, clients that are 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-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.
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 “802.1x Authentication
Configuration Guidelines” section on page 10-38.
Step 3
switchport mode access Set the port to access mode.
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 RSPAN 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.
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 10-38.
Step 3
switchport mode access Set the port to access mode.
Step 4
authentication port-control auto Enable 802.1x authentication on the port.
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