The USG2000 & 5000 & 6000 series is configured with port mirroring.

Enabling the port mirroring feature helps to locate the network, but because the function may affect the performance of the device to a certain extent, use it with caution.
After the network problem is finished, turn off port mirroring.
To prevent the problem that the mirroring packets can not be received due to the different transmission rate of the interface, make sure that the transmission rate of the observing port and the mirroring port are the same.

1. Run the system-view command to enter the system view.
2, the implementation of the command observing-port observing-port, configure the observation port.
The observing port is a non-service interface for transmitting traffic packets that are mirrored to the port. You can observe the packets passing through the corresponding port through the observing port.
Run the port-mirroring mirroring-port {both | inbound | outbound} observing-port [acl-number acl-number] command to enable port mirroring.
The mirroring port is a service port for sending and receiving service packets. Before you enable port mirroring, the corresponding observing port must already be configured with the observing-port command.

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