Allied Telesis AT-S24 - Manual (Page 82)

Configuring the Ports
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3. Select the desired port security level. The levels are described below:
Automatic
This selection disables port security. With this option activated, the
switch will not restrict the number of MAC addresses that are learned
on the switch ports. This is the default setting.
Limited
This selection activates a limited version of port security. With this
level selected, the switch will continue to learn MAC addresses for
each port up to a user defined maximum number. Once the
maximum number has been reached on a port, any frames received
on the port from a source with a new MAC addresses will be
discarded.
Note
Selecting this security level deletes all static MAC addresses. You
must reenter the static addresses. All static MAC addresses are
included in the count of maximum addresses that can be learned by
a port.
When you select this security level, the following prompts are
displayed:
Figure 37 Limited Port Security Prompts
Select the Config MAC address limit per port option to display a list of
the ports on the switch. In the list, specify the maximum number of
MAC addresses that you want each port to be able to learn. The
permitted range is 0 to 255. Specifying 0 (zero) means that the port
will not stop learning addresses. The default is 0.
The prompts also allow you to control how the switch will respond
when a port exceeds the specified number of MAC addresses. You can
instruct the switch to send an SNMP trap to the management station,
disable the port, or both.