switchport access VLAN can only access single VLAN IDtrunk port allows multiple VLAN tagging
I have a Dell EMC X1026 switch and I'm following the instructions in the user guide to enable 802.1X authentication on a port, with a Guest VLAN so if you connect without authenticating it works on a different VLAN. When authenticated: VLAN 10 When not authenticated (Guest VLAN): VLAN 30 So far, I have it working great for authenticated connections, and I have configured a Guest VLAN but I can't enable it on the port. When I go to "Edit Port Based Authentication - Interface Settings" and select "Guest VLAN": Enabled, when I try to save I get the following error:  "Critical Error: Failed to enable Guest VLAN on port gi1/0/13: the port is already a static member of VLAN 30 in at least one switchport mode." I have changed the port VLAN association and made sure that it wasn't set as a member, by setting it to "Access" on either VLAN (10, 30 or else) and I kept getting the error. It only finally worked when I set the port to "Trunk". Is this normal? 
Guest VLAN only works in Port Trunk mode