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Catalyst 2960 Switch SoftwareConfiguration Guide
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Chapter9 Configuring IEEE 802 .1x Port-Based Authentication
Configuring IEEE 802.1x Authentication
This example shows how to enable IEEE 802.1x and to allow multiple hosts:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x host-mode multi-host
Configuring a Guest VLAN
When you configure a guest VLAN, clients that are not IEEE 802.1x-capable are put into the guest
VLAN when the server does not receive a response to its EAP request/identity frame. Clients that are
IEEE 802.1x-capable but that fail authentication are not granted network access. The switch supp orts
guest VLANs in single-host or multiple-hosts mode.
Beginning in privileged EXEC mode, follow these steps to configure a guest VLAN. This procedure is
optional.
To disable and remove the guest VLAN, use the no dot1x guest-vlan interface configuration command.
The port returns to the unauthorized state.
This example shows how to enable VLAN 2 as an IEEE 802.1x guest VLAN:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# dot1x guest-vlan 2
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 2 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 2
You can enable optional guest VLAN behavior by using the dot1x guest-vlan supplicant global
configuration command. When enabled, the switch does not mai ntain the EAPOL packet history and
allows clients that fail authentication access to the guest VLAN, regardless of whether EAPOL packets
had been detected on the interface.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the port to be configured, and enter interface configuration mode.
For the supported port types, see the “IEEE 802.1x Configuration
Guidelines” section on page 9-12.
Step3 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.
Step4 end Return to privileged EXEC mode.
Step5 show dot1x interface interface-id Verify your entries.
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.