Working with guest VLAN and Auth-Fail VLAN
An 802.1X guest VLAN is the VLAN that a user is in before initiating authentication. An 802.1X Auth-Fail VLAN or a MAC authentication guest VLAN is the VLAN that a user is in after failing authentication. Support for the guest VLAN and Auth-Fail VLAN features varies with security modes.
You can use the 802.1X guest VLAN and 802.1X Auth-Fail VLAN features together with port security modes that support 802.1X authentication. For more information about the 802.1X guest VLAN and Auth-Fail VLAN on a port that performs MAC-based access control, see "Configuring 802.1X."
You can use the MAC authentication VLAN feature together with security modes that support MAC authentication. For more information about the MAC authentication guest VLAN, see "Configuring MAC authentication."
If you configure both an 802.1X Auth-Fail VLAN and a MAC authentication guest VLAN on a port that performs MAC-based access control, the 802.1X Auth-Fail VLAN has a higher priority.