Allied Telesis AT-S62 - Manual (Page 151)

AT-S62 Menus Interface User’s Guide
Section I: Basic Operations 151
Port Mirroring Overview
The port mirroring feature allows you to unobtrusively monitor the
traffic being received and transmitted on one or more ports on a switch
by having the traffic copied to another switch port. You can connect a
network analyzer to the port where the traffic is being copied and
monitor the traffic on the other ports without impacting network
performance or speed.
The port(s) whose traffic you want to mirror is called the source port(s).
The port where the traffic is copied to is called the destination port.
Observe the following guidelines when you create a port mirror:
❑ You can select only one destination port.
❑ You can select more than one source port. However, the more
ports you mirror, the less likely the destination port will be able to
handle all the traffic. For example, if you mirror the traffic of six
heavily active ports, the destination port is likely to drop packets,
meaning that it will not provide an accurate mirror of the traffic of
the six source ports.
❑ You can mirror either the ingress or egress traffic of the source
ports, or both.
❑ The source and destination ports must be located on the same
switch.
❑ For AT-8550GB Series switches, the source ports and the
destination port must be located within the same port group. The
port groups are:
— Ports 1 to 24 and 49
— Ports 25 to 48 and 50