1.
Open Configure | Port.
2. Click Mirroring.
3. Click Add to add a mirror port.
4. Watch the message bar above the dialog. It will tell you which port needs to be selected at the moment.
5. When the message bar says Select mirror from, click the From port on the switch graphic.
6. When the message bar says Select mirror to, click the To port on the switch graphic.
7. After both ports are set, Apply your changes and Close the dialog.
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