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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
dot1x guest-vlan
You can configure any active VLAN except an RSPAN VLAN or a voice VLAN as an IEEE 802.1x guest
VLAN. The guest VLAN feature is not supported on trunk ports; it is supported only on access ports.
After you configure a guest VLAN for an IEEE 802.1x port to which a DHCP client is connected, you
might need to get a host IP address from a DHCP server. You can also change the settings for restarting
the IEEE 802.1x authentication process on the switch before the DHCP process on the client times out
and tries to get a host IP address from the DHCP server. Decrease the settings for the IEEE 802.1x
authentication process (IEEE 802.1x quiet period and switch-to-client transmission time).
Examples This example shows how to specify VLAN 5 as an IEEE 802.1x guest VLAN:
Switch(config-if)# dot1x guest-vlan 5
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 resending the
request, and to enable VLAN 5 as an IEEE 802.1x guest VLAN when an IEEE 802.1x port is connected
to a DHCP client:
Switch(config-if)# dot1x timeout quiet-period 3
Switch(config-if)# dot1x timeout tx-period 15
Switch(config-if)# dot1x guest-vlan 5
This example shows how to enable the optional guest VLAN behavior and to specify VLAN 5 as an
IEEE 802.1x guest VLAN:
Switch(config)# dot1x guest-vlan supplicant
Switch(config)# interface FastEthernet0/1
Switch(config-if)# dot1x guest-vlan 5
You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC
command.
Related Commands Command Description
dot1x Enables the optional guest VLAN supplicant feature.
show dot1x [interface interface-id] Displays IEEE 802.1x status for the specified interface.
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