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