Allied Telesis AT-S25 - Manual (Page 224)

Section III: Web Browser Management
224
New selections appear in the Port Mirroring window, as shown in
Figure 91.
Figure 91 Port Mirroring Window
6. Use the Destination Module and Port pull-down menus to select the
destination port. This is the port where the network analyzer will be
located.
7. Use the Source Module and Port pull-down menus to select the
source port. This is the port whose traffic is to be copied to the
destination port.
8. Click Apply.
The port mirror is immediately activated. You can now connect a
data analyzer to the destination port to monitor the traffic on the
source port.