Meaning of port mirroring for the USG2000&5000 series

To locate network problems by capturing and analyzing session packets without interrupting services, you should configure port mirroring.
Port mirroring copies packets on the specified service interface to a non-service interface. When a session is abnormal, you can locate the fault by viewing the protocol analyzer connected to the non-service interface without affecting services. The service interface is known as the mirroring port and the non-service interface known as the observing port.

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