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Source Port
Select:
Select the desired port as a mirrored port. It is multi-optional.
Port:
Displays the port number.
Ingress:
Select Enable/Disable the Ingress feature. When the Ingress is
enabled, the incoming packets received by the mirrored port will
be copied to the mirroring port.
Egress: Select
Enable/Disable the Egress feature. When the Egress is
enabled, the outgoing packets sent by the mirrored port will be
copied to the mirroring port.
LAG:
Displays the LAG number which the port belongs to. The LAG
member cannot be selected as the mirrored
port or mirroring
port.
Note:
1. The LAG member cannot be selected as the mirrored port or mirroring port.
2. A port cannot be set as the mirrored port and the mirroring port simultaneously.
3. The Port Mirror function can span the multiple VLANs.
5.1.3 Port Security
MAC Address Table maintains the mapping relationship between the port and the MAC
address of the connected device, which is the base of the packet forwarding. The capacity of
MAC Address Table is fixed. MAC Address Attack is the attack method that the attacker takes
to obtain the 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 cannot access to the network via this port.
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