network information illegally. The attacker uses tools to generate the cheating MAC address and
quickly occupy the MAC Address Table. When the MAC Address Table is full, the switch will
broadcast the packets to all the ports. At this moment, the attacker can obtain the network
information via various sniffers and attacks. When the MAC Address Table is full, the packets
traffic will flood to all the ports, which results in overload, lower speed, packets drop and even
breakdown of the system.
Port Security is to protect the switch from the malicious MAC Address Attack by limiting the
maximum number of MAC addresses that can be learned on the port. The port with Port Security
feature enabled will learn the MAC address dynamically. When the learned MAC address number
reaches the maximum, the port will stop learning. Thereafter, the other devices with the MAC
address unlearned can not access to the network via this port.
Choose the menu Switching→Port→Port Security to load the following page.
Figure 5-4 Port Security
The following entries are displayed on this screen:
¾ Port Security
Select: Select the desired port for Port Security configuration. It is
multi-optional.
Port: Displays the port number.
Max Learned MAC: Specify the maximum number of MAC addresses that can be
learned on the port.
Learned Num: Displays the number of MAC addresses that have been learned
on the port.
Learn Mode: Select the Learn Mode for the port.
• Dynamic: When Dynamic mode is selected, the learned
MAC address will be deleted automatically after the aging
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