Dell PowerConnect B-RX Configuration Manual page 1057

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Specifying the authentication-failure action
In an 802.1x multiple client configuration, if RADIUS authentication for a Client is unsuccessful,
traffic from that Client is either dropped in hardware (the default), or the Client's port is placed in a
"restricted" VLAN. You can specify which of these two authentication-failure actions is to be used.
If the authentication-failure action is to place the port in a restricted VLAN, you can specify the ID of
the restricted VLAN.
To specify that the authentication-failure action is to place the Client's port in a restricted VLAN,
enter the following command.
BigIron RX(config)# dot1x-enable
BigIron RX(config-dot1x)# auth-fail-action restricted-vlan
Syntax: [no] auth-fail-action restricted-vlan
To specify the ID of the restricted VLAN as VLAN 300, enter the following command.
BigIron RX(config-dot1x)# auth-fail-vlanid 300
Syntax: [no] auth-fail-vlanid <vlan-id>
Specifying the number of authentication attempts the device
makes before dropping packets
When the authentication-failure action is to drop traffic from the Client, and the initial
authentication attempt made by the device to authenticate the Client is unsuccessful, the BigIron
RX immediately retries to authenticate the Client. After three unsuccessful authentication
attempts, the Client's dot1x-mac-session is set to "access-denied", causing traffic from the Client
to be dropped in hardware.
You can optionally configure the number of authentication attempts the device makes before
dropping traffic from the Client. To do so, enter a command such as the following.
BigIron RX(config-dot1x)# auth-fail-max-attempts 2
Syntax: [no] auth-fail-max-attempts <attempts>
By default, the device makes 3 attempts to authenticate a Client before dropping packets from the
Client. You can specify between 1 – 10 authentication attempts.
Display commands
The show port security global-deny command lists all the configured global deny MAC addresses.
The show port security denied mac command lists all the denied MAC addresses in the system.
BigIron RX Series Configuration Guide
53-1002253-01
Specify the authentication-failure action
Specify the number of authentication attempts the device makes before dropping packets
Disabling aging for dot1x-mac-sessions
Configure aging time for blocked Clients
Clear the dot1x-mac-session for a MAC address
Configuring 802.1x port security
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