Brocade Communications Systems Brocade ICX 6650 6650 Manual De Usuario

Sample 802.1X configurations

Brocade(config)#interface ethernet 1/2/1
Brocade(config-if-e10000-1/2/1)# dot1x port-control auto
Brocade(config-if-e10000-1/2/1)# exit

802.1X authentication with dynamic VLAN assignment

 illustrates 802.1X authentication with dynamic VLAN assignment. In this configuration, 

two user PCs are connected to a hub, which is connected to port e1/2/1. Port e1/2/1 is configured 
as a dual-mode port. Both PCs transmit untagged traffic. The profile for User 1 on the RADIUS 
server specifies that User 1 PC should be dynamically assigned to VLAN 3. The RADIUS profile for 
User 2 on the RADIUS server specifies that User 2 PC should be dynamically assigned to VLAN 20.

FIGURE 8

 Sample configuration using 802.1X authentication with dynamic VLAN assignment

In this example, the PVID for port e1/2/1 would be changed based on the first host to be 
successfully authenticated. If User 1 is authenticated first, then the PVID for port e1/2/1 is 
changed to VLAN 3. If User 2 is authenticated first, then the PVID for port e1/2/1 is changed to 
VLAN 20. Since a PVID cannot be changed by RADIUS authentication after it has been dynamically 
assigned, if User 2 is authenticated after the port PVID was changed to VLAN 3, then User 2 would 
not be able to gain access to the network.

If there were only one device connected to the port, and authentication failed for that device, it 
could be placed into the restricted VLAN, where it could gain access to the network.

The portion of the running-config related to 802.1X authentication is as follows.

dot1x-enable
 re-authentication
 servertimeout 10
 timeout re-authperiod 10
 auth-fail-action restricted-vlan

Untagged

Untagged

MAC: 0000.007f.2e0a

MAC: 0000.008e.86ac

Port e1/2/1
Dual Mode

RADIUS Server
Tunnel-Private-Group-ID:
User 1 -> “U:3”
User 2 -> “U:20”