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Port Mirroring

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1. Definitions

Port mirroring copies data from one or more mirrored ports to the observing port. The user analyzes the copied data to implement network monitoring and troubleshooting.

Mirrored port: Indicates the monitored port. All packets passing through the mirrored port or packets matching the traffic classification rule are copied to the observing port.

Observing port: Indicates the port connected to the monitoring device. It is used to output the packets copied from the mirrored port.

Port mirroring has three directions:

Inbound direction: Mirrors the packets received by the port.

Outbound direction: Mirrors the packets sent by the port.

Bidirectional: Mirrors the packets received and sent by the port.


Mirroring data forwarding does not affect the data exchange of the mirrored port. It only sends the copy of the data packet sent or received by the mirrored port to the observing port.

A physical port cannot be configured as both an observing port and a mirrored port.

2. Configuration


Configure GE0/0/8 of LSW2 as an observing port.


Configure the GE0/0/1 interface as a mirrored port, and copy the GE0/0/1 data to the observing port GE0/0/8.


Check the configuration result.




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