TL-SL3428_V3_User_Guide - TP-Link

enabled, the outgoing packets sent by the mirrored port will becopied to the mirroring port.LAG:Displays the LAG number which the port belongs to. The LAGmember can not be selected as the mirrored port or mirroring port.Note:1. The LAG member can not be selected as the mirrored port or mirroring port.2. A port can not be set as the mirrored port and the mirroring port simultaneously.3. The Port Mirror function can take effect span the multiple VLANs.5.1.3 Port SecurityMAC Address Table maintains the mapping relationship between the port and the MAC address ofthe connected device, which is the base of the packet forwarding. The capacity of MAC AddressTable is fixed. MAC Address Attack is the attack method that the attacker takes to obtain thenetwork information illegally. The attacker uses tools to generate the cheating MAC address andquickly occupy the MAC Address Table. When the MAC Address Table is full, the switch willbroadcast the packets to all the ports. At this moment, the attacker can obtain the networkinformation via various sniffers and attacks. When the MAC Address Table is full, the packetstraffic will flood to all the ports, which results in overload, lower speed, packets drop and evenbreakdown of the system.Port Security is to protect the switch from the malicious MAC Address Attack by limiting themaximum number of MAC addresses that can be learned on the port. The port with Port Securityfeature enabled will learn the MAC address dynamically. When the learned MAC address numberreaches the maximum, the port will stop learning. Thereafter, the other devices with the MACaddress unlearned can not access to the network via this port.Choose the menu Switching→Port→Port Security to load the following page.34