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-rw-r--r--docs/_include/interface-mirror.txt5
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SPAN port mirroring can copy the inbound/outbound traffic of the interface to
the specified interface, usually the interface can be connected to some special
equipment, such as behavior control system, intrusion detection system and
-traffic collector, and can copy all related traffic from this port
+traffic collector, and can copy all related traffic from this port.
+The benefit of mirroring the traffic is that the application is isolated from
+the source traffic and so application processing does not affect the traffic
+or the system performance.
VyOS uses the `mirror` option to configure port mirroring. The configuration
is divided into 2 different directions. Destination ports should be configured