ZyXEL Communications GS3700 Series, Handbook

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6.3.3 Configure Mirroring (For “Test the Result”)
1 To verify that results are acceptable, we have to use the
mirroring function to check if the priority of the packet is what
we assigned. Enter the web GUI and go to
Menu > Advanced
Application > Mirroring . Check the “Active” box. Key in the
Monitor port, which is used to monitor the traffic. Check the
port we want to mirror. In this example, it is port 2. Select the
direction as “Both”. Click “Apply”.