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PowerConnect B-Series FCX Configuration Guide 1235
53-1002266-01
Configuring 802.1X port security
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• A dynamic IP ACL will take precedence over an IP ACL that is bound to a port (port ACL). When
a client authenticates with a dynamic IP ACL, the port ACL will not be applied. Also, future
clients on the same port will authenticate with a dynamic IP ACL or no IP ACL. If no clients on
the port use dynamic ACL, then the port ACL will be applied to all traffic.
Disabling and enabling strict security mode for dynamic filter assignment
By default, 802.1X dynamic filter assignment operates in strict security mode. When strict security
mode is enabled, 802.1X authentication for a port fails if the Filter-ID attribute contains invalid
information, or if insufficient system resources are available to implement the per-user IP ACLs or
MAC address filters specified in the Vendor-Specific attribute.
When strict security mode is enabled:
• If the Filter-ID attribute in the Access-Accept message contains a value that does not refer to
an existing filter (that is, a MAC address filter or IP ACL configured on the device), then the port
will not be authenticated, regardless of any other information in the message (for example, if
the Tunnel-Private-Group-ID attribute specifies a VLAN on which to assign the port).
• If the Vendor-Specific attribute specifies the syntax for a filter, but there are insufficient system
resources to implement the filter, then the port will not be authenticated.
• If the device does not have the system resources available to dynamically apply a filter to a
port, then the port will not be authenticated.
NOTE
If the Access-Accept message contains values for both the Filter-ID and Vendor-Specific
attributes, then the value in the Vendor-Specific attribute (the per-user filter) takes
precedence.
Also, if authentication for a port fails because the Filter-ID attribute referred to a non-existent
filter, or there were insufficient system resources to implement the filter, then a Syslog
message is generated.
When strict security mode is disabled:
• If the Filter-ID attribute in the Access-Accept message contains a value that does not refer to
an existing filter (that is, a MAC address filter or IP ACL configured on the device), then the port
is still authenticated, but no filter is dynamically applied to it.
• If the Vendor-Specific attribute specifies the syntax for a filter, but there are insufficient system
resources to implement the filter, then the port is still authenticated, but the filter specified in
the Vendor-Specific attribute is not applied to the port.
By default, strict security mode is enabled for all 802.1X-enabled interfaces, but you can manually
disable or enable it, either globally or for specific interfaces.
To disable strict security mode globally, enter the following commands.
PowerConnect(config)#dot1x-enable
PowerConnect(config-dot1x)#no global-filter-strict-security
After you globally disable strict security mode, you can re-enable it by entering the following
command.
PowerConnect(config-dot1x)#global-filter-strict-security
Syntax: [no] global-filter-strict-security
To disable strict security mode for a specific interface, enter commands such as the following.