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further authentication. Whereas the randomly-generated key in EAP-MD5 relay mode is generated 
by the authentication server, and the switch is responsible to encapsulate the authentication 
packet and forward it to the RADIUS server. 



In 802.1 x authentication, the following timers are used to ensure that the supplicant system, the 
switch, and the RADIUS server interact in an orderly way: 

（

1）  Supplicant system timer (Supplicant Timeout): This timer is triggered by the switch 

after the switch sends a request packet to a supplicant system. The switch will resend the 
request packet to the supplicant system if the supplicant system fails to respond in the 
specified timeout period. 

（

2）  RADIUS server timer (Server Timeout): This timer is triggered by the switch after the 

switch sends an authentication request packet to RADIUS server. The switch will resend 
the authentication request packet if the RADIUS server fails to respond in the specified 
timeout period. 

（

3）  Quiet-period timer (Quiet Period): This timer sets the quiet-period. When a supplicant 

system fails to pass the authentication, the switch quiets for the specified period before it 
processes another authentication request re-initiated by the supplicant system. 



Guest VLAN function enables the supplicants that do not pass the authentication to access the 
specific network resource.   

By default, all the ports connected to the supplicants belong to a VLAN, i.e. Guest VLAN. Users 
belonging to the Guest VLAN can access the resources of the Guest VLAN without being 
authenticated. But they need to be authenticated before accessing external resources. After 
passing the authentication, the ports will be removed from the Guest VLAN and be allowed to 
access the other resources.   

With the Guest VLAN function enabled, users can access the Guest VLAN to install 802.1X client 
program or upgrade their 802.1x clients without being authenticated. If there is no supplicant past 
the authentication on the port in a certain time, the switch will add the port to the Guest VLAN.   

With 802.1X function enabled and Guest VLAN configured, after the maximum number retries 
have been made to send the EAP-Request/Identity packets and there are still ports that have not 
sent any response back, the switch will then add these ports into the Guest VLAN according to 
their link types. Only when the corresponding user passes the 802.1X authentication, the port will 
be removed from the Guest VLAN and added to the specified VLAN. In addition, the port will back 
to the Guest VLAN when its connected user logs off. 

The  802.1X function is implemented on the Global Config,  Port Config and Radius Server 
pages. 

On this page, you can enable the 802.1X authentication function globally and control the 
authentication process by specifying the Authentication Method, Guest VLAN and various Timers.   

Choose the menu Network Security→802.1X→Global Config to load the following page. 

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