Allied Telesis AT-S63 - Manual (Page 86)

Chapter 6: Port Mirroring
86 Section I: Basic Features
d. Using the stack ID pull-down menu in the upper left corner of the
switch image, select the ID number of the switch that has the port
that you want to make the new destination port. If the switch is
already displayed, you can skip this step.
e. Click the port until it turns solid white, as shown in Table 13 on
page 83.
f. Click Apply to close the Modify Mirror popup window.
8. To activate the port mirror again:
a. Click the Modify button.
b. Click the Enable Mirror checkbox to add the check and click the
Apply button.
9. To save your changes in the configuration file on the master switch,
click the Save Config button in the Configuration menu.