Dot1X Guest-Vlan - Cisco Catalyst 2960 Command Reference Manual

Chapter 2 Catalyst 2960 Switch Cisco IOS Commands

dot1x guest-vlan

Use the dot1x guest-vlan interface configuration command to specify an active VLAN as an
IEEE 802.1x guest VLAN. Use the no form of this command to return to the default setting.
Syntax Description
vlan-id
Defaults No guest VLAN is configured.
Command Modes Interface configuration
Command History Release
12.2(25)FX
Usage Guidelines
For each IEEE 802.1x port on the switch, you can configure a guest VLAN to provide limited services
to clients (a device or workstation connected to the switch) not currently running IEEE 802.1x. These
users might be upgrading their systems for IEEE 802.1x authentication, and some hosts, such as
Windows 98 systems, might not be IEEE 802.1x-capable.
When you enable a guest VLAN on an IEEE 802.1x port, the switch assigns clients to a guest VLAN
when it does not receive a response to its Extensible Authentication Protocol over LAN (EAPOL)
request/identity frame or when EAPOL packets are not sent by the client.
The switch maintains the EAPOL packet history. If another EAPOL packet is detected on the interface
during the lifetime of the link, the guest VLAN feature is disabled. If the port is already in the guest
VLAN state, the port is returned to the unauthorized state, and authentication is restarted. The EAPOL
history is reset upon loss of link.
Entering the dot1x guest-vlan supplicant global configuration command disables this behavior.
Any number of non-IEEE 802.1x-capable clients are allowed access when the switch port is moved to
the guest VLAN. If an IEEE 802.1x-capable client joins the same port on which the guest VLAN is
configured, the port is put into the unauthorized state in the user-configured access VLAN, and
authentication is restarted.
Guest VLANs are supported on IEEE 802.1x ports in single-host or multiple-hosts mode.
You can configure any active VLAN except an Remote Switched Port Analyzer (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.
78-16882-01
dot1x guest-vlan vlan-id
no dot1x guest-vlan
Specify an active VLAN as an IEEE 802.1x guest VLAN. The range is 1 to
4094.
Modification
This command was introduced.
Catalyst 2960 Switch Command Reference
dot1x guest-vlan
2-65