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13-73

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

How RADIUS/802.1X Authentication Affects VLAN Operation

■ VLAN 33 becomes unavailable to port 2 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 13-20 where

<vlan-id> is the (static or dynamic) VLAN used in the authenticated client

session.

Figure 13-20. The Active Configuration for VLAN 22 Temporarily Changes for the 802.1X Session

However, as shown in Figure 13-20, because VLAN 33 is configured as

untagged on port 2 and because a port can be untagged on only one VLAN,

port 2 loses access to VLAN 33 for the duration of the 802.1X session on VLAN

22.

You can verify the temporary loss of access to VLAN 33 by entering the show

vlan 33 command as shown in Figure 13-21.

HP Switch(config)# show vlan 22

Status and Counters - VLAN Information - VLAN 22

VLAN ID : 22

Name : vlan 22

Status : Static

Voice : No

Jumbo : No

Port Information Mode Unknown VLAN Status

---------------- -------- ------------ ----------

1 Tagged Learn Up

2 802.1X Learn Up

4 Tagged Learn Up

Overriden Port VLAN configuration

Port Mode

---- ----------

2 No

This entry shows that port 2 is temporarily untagged on

VLAN 22 for an 802.1X session. This is to accommodate

an 802.1X client’s access, authenticated by a RADIUS

server, where the server included an instruction to put

the client’s access on VLAN 22.

Note: With the current VLAN configuration (figure 13-20),

the only time port 2 appears in this show vlan 22 listing

is during an 802.1X session with an attached client.

Otherwise, port 2 is not listed.

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