Allied Telesis AT-S88 - Manual (Page 70)

Chapter 7: Port Mirroring
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A check mark is placed for each port you select, as for example
Figure 20.
Figure 20. Ingress Ports Selected
3. Select the ports whose egress traffic you want to monitor by clicking
the port icon in the graphic image of the switch front at the top of the
page.
A check mark is placed for each port you select, as for example
Figure 21.
Figure 21. Egress Ports Selected
4. In the Monitor Port list, select the port to which the traffic will be sent.