Operation Diagnosis
UM Basic Configuration L3P
Release
7.1
12/2011
9.12
Monitoring Data Traffic at Ports
(Port Mirroring)
241
9.12Monitoring Data Traffic at
Ports (Port Mirroring)
The port mirroring function enables you to review the data traffic at up to
8 ports of the device for diagnostic purposes. The device additionally
forwards (mirrors) the data for these ports to another port. This process is
also called port mirroring.
The ports to be reviewed are known as source ports. The port to which the
data to be reviewed is copied is called the destination port. You can only use
physical ports as source or destination ports.
In port mirroring, the device copies valid incoming and outgoing data packets
of the source port to the destination port. The device does not affect the data
traffic at the source ports during port mirroring.
A management tool connected at the destination port, e.g. an RMON probe,
can thus monitor the data traffic of the source ports in the sending and
receiving directions.
Figure 58: Port mirroring
PLCSwitch
Backbone
RMON-Probe
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