1-1 
1  Mirroring Configuration 
When configuring mirroring, go to these sections for information you are interested in: 
z   Mirroring Overview 
z   Mirroring Configuration 
z   Displaying Port Mirroring 
z   Mirroring Configuration Examples 
Mirroring Overview 
Mirroring is to duplicate packets from a port to another port connected with a data 
monitoring device for network monitoring and diagnosis.  
The port where packets are duplicated is called the source mirroring port or monitored port 
and the port to which duplicated packets are sent is called the destination mirroring port or 
the monitor port, as shown in the following figure. 
Figure 1-1 Mirroring 
 
 
The Switch 4200G series support five two types of port mirroring:  
z   Local Port Mirroring 
z   Remote Port Mirroring 
They are described in the following sections. 
1.1.1  Local Port Mirroring 
In local port mirroring, packets passing through one or more source ports of a device are 
copied to the destination port on the same device for packet analysis and monitoring. In 
this case, the source ports and the destination port must be located on the same device.