Allied Telesis AT-S63 - Manual (Page 192)

Chapter 12: Port Mirroring Commands
192 Section I: Basic Operations
Overview
The port mirror feature allows you to unobtrusive monitor the ingress or
egress traffic on one or more ports on a stack by copying the traffic to
another stack port. By connecting a network analyzer to the port where the
traffic is being copied to, you can 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 will be copied to is called the destination port.
Observe the following guidelines when creating a port mirror:
ˆ A stack 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 The destination and source ports can be located on different switches
in the stack.
ˆ You can mirror the ingress or egress traffic of the source ports, or both.