Allied Telesis AT-S60 - Manual (Page 126)

AT-S60 Management Software User’s Guide
Section II: Local and Telnet Management 125
Port Mirroring Overview
The port mirroring feature allows you to monitor the traffic on one or
more ports by copying the traffic to another port which is called the
destination mirror port. Using port mirroring, you can connect a network
analyzer to the mirror port to monitor both traffic received and
transmitted from one or more ports (which are called source mirror
ports). In the software, the destination mirror port is called the
destination port while the source mirror ports are called source ports.
Observe the following guidelines when creating a port mirror:
❑ You can mirror from one to 12 ports on a switch at a time,
depending on number and types of line cards installed in your
chassis.
❑ The ports that are mirrored and the mirroring port must be
located on the same switch.
❑ You can assign each line card one source mirroring port and one
destination mirroring port. Each line card can participate in only
one port mirror.
❑ When setting up a port mirror, you need to consider the transfer
rate of the source ports and the receive rate of the destination
port mirror. When you exceed the maximum receive rate of the
destination port, you might not be able to monitor all of the
frames. For example, two 100 Mbps source ports sending
bidirectional traffic are mirrored to a 100 Mbps destination port.
The maximum receive rate of the 100 Mbps destination port is 100
Mbps. As a result, frames are dropped (assuming a maximum
transfer rate). If you replace the 100 Mbps destination port with a
1GB port in this scenario, then the receive rate of the 1GB
destination port is 400 Mbps.