Configuring Port-Based and Client-Based Access Control (802.1X)

How RADIUS/802.1X Authentication Affects VLAN Operation

supplicant port to another without clearing the statistics data from the first port, the authenticator’s MAC address will appear in the supplicant statistics for both ports.

How RADIUS/802.1X AuthenticationAffects VLAN Operation

Static VLAN Requirement. RADIUS authentication for an 802.1X client on a given port can include a (static) VLAN requirement. (Refer to the documentation provided with your RADIUS application.) The static VLAN to which a RADIUS server assigns a client must already exist on the switch. If it does not exist or is a dynamic VLAN (created by GVRP), authentication fails. Also, for the session to proceed, the port must be an untagged member of the required VLAN. If it is not, the switch temporarily reassigns the port as described below.

If the Port Used by the Client Is Not Configured as an Untagged

Member of the Required Static VLAN: When a client is authenticated on port “N”, if port “N” is not already configured as an untagged member of the static VLAN specified by the RADIUS server, then the switch temporarily assigns port “N” as an untagged member of the required VLAN (for the duration of the 802.1X session). At the same time, if port “N” is already configured as an untagged member of another VLAN, port “N” loses access to that other VLAN for the duration of the session. (This is because a port can be an untagged member of only one VLAN at a time.)

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