Configuration guidelines
When you configure an 802.1X Auth-Fail VLAN, follow these restrictions and guidelines:
Assign different IDs the port VLAN and the 802.1X Auth-Fail VLAN on a port
You can configure only one 802.1X Auth-Fail VLAN on a port. The 802.1X Auth-Fail VLANs on different ports can be different.
You cannot specify a VLAN as both a super VLAN and an 802.1X Auth-Fail VLAN.
Make sure you have created the VLAN to be specified as the 802.1XAuth-Fail VLAN.