Allied Telesis AT-8100L/8POE, Руководство пользователя

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Chapter 6: Port Mirroring
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Overview
To use the port mirroring feature, you must designate one or more source
ports and one destination port. The source ports are the ports whose
packets are mirrored and monitored. The destination port is the port where
the packets from the source ports are copied and where the network
analyzer is connected. There can be only one destination port on the
switch.
Here are guidelines for setting the port mirroring feature:

Port mirroring can have one destination port.

Port mirroring can have more than one source port. This allows you to
monitor the traffic on multiple ports at the same time. For example, you
might monitor the traffic on all the ports of a particular VLAN.

You can select whether to mirror the receive traffic, the transmit traffic,
or both, on the source ports.

The destination port must not be a member of a static port trunk or an
LACP trunk.