Allied Telesis AT-S39 - Manual (Page 79)

AT-S39 User’s Guide
79
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.
Observe the following guidelines when creating a port mirror:
❑ You can mirror from one to 23 ports on a switch at a time.
However, the more ports you mirror, the less likely the mirroring
port will be able to handle all the traffic. For example, if you mirror
the traffic of six heavily active ports, the mirror port is likely to
drop packets, meaning that it will not provide an accurate mirror
of the traffic of the other six ports.
❑ The ports to be mirrored and the mirroring port must be located
on the same switch.
❑ The ports to be mirrored and the mirroring port must be
operating at the same speed. For example, you cannot use a
10/100 Mbps port to mirror traffic on a 1000 Mbps GBIC port.