Allied Telesis AT-S63 - Manual (Page 117)

AT-S63 Management Software Features Guide
Section I: Basic Operations 117
Overview
The port mirror feature allows for the unobtrusive monitoring of ingress or
egress traffic on one or more ports on a switch, without impacting network
performance or speed. It copies the traffic from specified ports to another
switch port where the traffic can be monitored with a network analyzer.
The port(s) whose traffic is mirrored is called the source port(s). The port
where the traffic is copied to is referred to as the destination port.
Guidelines
Observe the following guidelines when creating a port mirror:
 A standalone switch can have only one destination port.
 An AT-9400Ts Stack can have only one destination port.
 You can mirror more than one source port at a time. However, the
destination port may have to discard packets if the source ports are
very active.
 The source and destination ports for a port mirror on a stand-alone
switch must be located on the same switch.
 The destination and source ports for a port mirror in an AT-9400Ts
Stack can be located on different switches in the same stack.
 You can mirror the ingress or egress traffic of the source ports, or both.
 To create a mirror port for the Denial of Service defenses, specify only
the destination port for the mirrored traffic. The management software
automatically determines the source ports.