Allied Telesis AT-S25 - Manual (Page 76)

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Configuring a Port Mirror
Port mirroring allows you to monitor the traffic on a port by having both
the receive and transmit traffic on a port copied to another port on the
switch. This enables you to monitor the traffic on the original port
without interrupting network traffic by connecting a network analyzer
or RMON port to the port which is functioning as the mirror port.
The port whose traffic is to be monitored is referred to as the source
port. The port that will function as the mirror port is referred to as the
destination port. When selecting the source and destination ports, be
sure to observe the following guidelines.
❑ The destination port cannot be used by a network node, such as a
workstation or server.
❑ Both the source and destination ports must be on the same switch
in a stack.
❑ You cannot monitor more than one port in a stack at a time.
Enabling Port
Mirroring
To enable port mirroring on a switch, perform the following procedure:
1. From the Main Menu, select any switch in the stack. You do not need
to select the switch in which you intend to activate port mirroring.
2. From the Main Menu, select Traffic/Port Mirroring.
The Port Mirroring window in Figure 30 is displayed.
Figure 30 Port Mirroring Window