3com S7906E Manuel De Montage

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Port Mirroring Configuration 
When configuring port mirroring, go to these sections for information you are interested in: 
Introduction to Port Mirroring 
Port mirroring is to copy the packets passing through a port (called a mirroring port) to another port 
(called the monitor port) connected with a monitoring device for packet analysis.  
You can select to port-mirror inbound, outbound, or bidirectional traffic on a port as needed.  
Classification of Port Mirroring 
Port mirroring falls into the following types: 
Local port mirroring: In local port mirroring, the mirroring port and the monitor port are located on 
the same device.  
Layer 2 remote port mirroring: In Layer 2 remote port mirroring, the mirroring port and the monitor 
port are located on different devices on a same Layer 2 network.  
Layer 3 remote port mirroring: In Layer 3 remote port mirroring, the mirroring port and the monitor 
port are separated by IP networks.  
 
 
As a monitor port can monitor multiple ports, it may receive multiple duplicates of a packet in some 
cases. Suppose that Port 1 is monitoring bidirectional traffic on Port 2 and Port 3 on the same 
device. If a packet travels from Port 2 to Port 3, two duplicates of the packet will be received on 
Port 1. 
Given an S7900E series switch, if incoming traffic is mirrored, the mirrored traffic is sent with the 
same VLAN tag (if any) as the original traffic; if the outgoing traffic is mirrored, the mirrored traffic 
carries the same VLAN tag as the original traffic did before it was sent out the mirroring ports. 
 
Implementing Port Mirroring 
Port mirroring is implemented through port mirroring groups. There are three types of mirroring groups: 
local, remote source, and remote destination.