VLANs
11.2
Guest VLAN / Unauthenticated VLAN
143
UM Config GRS
Release
8.0
09/2019
11.2
Guest VLAN / Unauthenticated VLAN
A Guest VLAN lets a device provide port-based Network Access Control (IEEE 802.1x) to non-
802.1x capable supplicants. This feature provides a mechanism to allow guests to access external
networks only. If you connect non-802.1x capable supplicants to an active unauthorized 802.1x
port, then the supplicants send no responds to 802.1x requests. Since the supplicants send no
responses, the port remains in the unauthorized state. The supplicants have no access to external
networks.
The Guest VLAN supplicant is a per-port basis configuration. When you configure a port as a Guest
VLAN and connect non-802.1x capable supplicants to this port, the device assigns the supplicants
to the Guest VLAN. Adding supplicants to a Guest VLAN causes the port to change to the
authorized state allowing the supplicants to access to external networks.
An Unauthenticated VLAN lets the device provide service to 802.1x capable supplicants which
authenticate incorrectly. This function lets the unauthorized supplicants have access to limited
services. If you configure an Unauthenticated VLAN on a port with 802.1x port authentication and
the global operation enabled, then the device places the port in an Unauthenticated VLAN. When
a 802.1x capable supplicant incorrectly authenticates on the port, the device adds the supplicant to
the Unauthenticated VLAN. If you also configure a Guest VLAN on the port, then non-802.1x
capable supplicants use the Guest VLAN.
If the port has an Unauthenticated VLAN assigned, then the reauthentication timer counts down.
When the time specified in the
Reauthentication period [s]
column expires and supplicants are present
on the port, the Unauthenticated VLAN reauthenticates. When no supplicants are present, the
device places the port in the configured Guest VLAN.
The following example explains how to create a Guest VLAN. Create an Unauthorized VLAN in the
same manner.
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