DELL N3000 User Manual

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Configuring Port and System Security
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When a client is connected to a port, the switch tries to authenticate the 
user/client using the methods in configuration order. If any authentication 
method times out (an error), then the next authentication method is tried. If 
all authentication methods configured for the port error out, the switch starts 
a timer whose value is equal to the authentication restart timer. At the expiry 
of the timer, the switch restarts the authentication process from the first 
method. This timer starts only when all of the authentication methods error 
out.
The authentication manager controls only the order in which the 
authentication methods are executed. The switch administrator is responsible 
for implementing the required configuration for the respective methods to 
authenticate successfully.
Authentication Restart
Authentication restarts from the first configured method on any of the 
following events:
• Link flap
• Authentication fails for all configured methods
• Authentication priority (802.1X packet received when a lower priority 
method is active)
802.1X Interaction
By default, 802.1X drops all traffic prior to successful 802.1X (or MAB) 
authentication. If captive portal is configured as a method, authentication 
allows certain traffic types, such as DHCP or DNS, access to the network 
during the captive portal method invocation. 
Authentication Priority
The default authentication priority of a method is equivalent to its position 
in the order of the authentication list. If authentication method priorities are 
not configured, then the relative priorities (first is highest) are in the same 
order as that of the per-port based authentication list.