Allied Telesis AT-S63 - Manual (Page 95)

AT-S63 Management Software Features Guide
Section I: Basic Operations 95
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:
ˆ A standalone switch can have only one destination port.
ˆ A stack of Basic Layer 3 switches and the AT-StackXG Stacking
Module can have only one destination port.
ˆ 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.
ˆ In a stand-alone switch the source and destination ports must be
located on the same switch.
ˆ For a stack of Basic Layer 3 switches and the AT-StackXG Stacking
Module, the destination and source ports of a port mirror can be
located on different switches in the same stack.
ˆ You can mirror the ingress or egress traffic of the source ports, or both.
ˆ 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.