Configuring Port-Based and User-Based Access Control (802.1X)
How RADIUS/802.1X Authentication Affects VLAN Operation
For example, suppose that a RADIUS-authenticated, 802.1X-aware client on
port A2 requires access to VLAN 22, but VLAN 22 is configured for no access
on port A2, and VLAN 33 is configured as untagged on port A2:
Figure 12-20.Example of an Active VLAN Configuration
In Figure 12-20, if RADIUS authorizes an 802.1X client on port A2 with the
requirement that the client use VLAN 22, then:
â– VLAN 22 becomes available as Untagged on port A2 for the duration of
the session.
â– VLAN 33 becomes unavailable to port A2 for the duration of the session
(because there can be only one untagged VLAN on any port).
To view the temporary VLAN assignment as a change in the active configura-
tion, use the show vlan <vlan-id> command as shown in Figure 12-19 where
<vlan-id> is the (static or dynamic) VLAN used in the authenticated client
session.
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