13-7
Configuring Port-Based and User-Based Access Control (802.1X)
Terminology
designate as the Unauthorized-Client VLAN.) A port configured to use a 
given Unauthorized-Client VLAN does not have to be statically configured 
as a member of that VLAN as long as at least one other port on the switch 
is statically configured as a tagged or untagged member of the same 
Unauthorized-Client VLAN. An unauthorized-client VLAN is available on 
a port only if there is no authenticated client already using the port. 
Untagged Membership in a VLAN: A port can be an untagged member of 
only one VLAN (unless MAC-based VLANs are enabled. Please see “MAC-
Based VLANs” on page 6-51). (In the factory-default configuration, all 
ports on the switch are untagged members of the default VLAN.) An 
untagged VLAN membership is required for a client that does not support 
802.1q VLAN tagging. A port can simultaneously have one untagged VLAN 
membership and multiple tagged VLAN memberships. Depending on how 
you configure 802.1X Open VLAN mode for a port, a statically configured, 
untagged VLAN membership may become unavailable while there is a 
client session on the port. See also “Tagged Membership in a VLAN”.