TP-Link TL-ER6120 User Manual page 43

General

Enable Port Mirror:
Mode:
Port Mirror

Mirroring Port:
Mirrored Port:
The entry in Figure 3-21 indicates: The outgoing packets sent by port 1, port 2, port 3 and port 5
(mirrored ports) will be copied to port 4 (mirroring port).
Tips:
If both the mirrored port and the mirroring port are the LAN ports, these two LAN ports should be in the
same Port VLAN. For example, if port 3 (the mirroring port) and port 4 (the mirrored port) are the LAN
ports, the Port Mirror function can take effect only when port 3 and port 4 are in the same Port VLAN.
Application Example:
To monitor all the traffic and analyze the network abnormity for an enterprise's network, please set the
Port Mirror function as below:
Check the box to enable the Port Mirror function. If unchecked, it will be
disabled.
Select the mode for the port mirror function. Options include:
Ingress: When this mode is selected, only the incoming packets sent

by the mirrored port will be copied to the mirroring port.
Egress: When this mode is selected, only the outgoing packets sent

by the mirrored port will be copied to the mirroring port.
Ingress&Egress: When this mode is selected, both the incoming and

outgoing packets through the mirrored port will be copied to the
mirroring port.
Select the Mirroring Port to which the traffic is copied. Only one port can
be selected as the mirroring port.
Select the Mirrored Port from which the traffic is mirrored. One or multiple
ports can be selected as the mirrored ports.
-37-