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3com WX3000 Manuel D’Utilisation

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Table 1-1 Ports involved in the mirroring operation 
Switch 
Ports involved 
Function 
Source port 
Port monitored. It copies packets to the reflector port 
through local port mirroring. There can be more than 
one source port.  
Reflector port 
Receives packets from the source port and 
broadcasts the packets in the remote-probe VLAN. 
Source switch 
Trunk port 
Sends mirrored packets to the intermediate switch or 
the destination switch.  
Intermediate 
switch 
Trunk port 
Sends mirrored packets to the destination switch.  
Two trunk ports are necessary for the intermediate 
switch to connect the devices at the source switch 
side and the destination switch side.  
Trunk port 
Receives remote mirrored packets.  
Destination switch 
Destination port 
Receives packets forwarded from the trunk port and 
transmits the packets to the data detection device. 
 
 
z 
Do not configure a default VLAN, a management VLAN, or a dynamic VLAN as the remote-probe 
VLAN. 
z 
Configure all ports connecting the devices in the remote-probe VLAN as trunk ports, and ensure 
the Layer 2 connectivity from the source switch to the destination switch over the remote-probe 
VLAN. 
z 
Do not configure a Layer 3 interface for the remote-probe VLAN, run other protocol packets, or 
carry other service packets on the remote-prove VLAN and do not use the remote-prove VLAN as 
the voice VLAN and protocol VLAN; otherwise, remote port mirroring may be affected. 
 
MAC-Based Mirroring 
With MAC-based mirroring configured, a device mirrors packets matching the specified MAC address to 
the destination port, including: 
z 
Packets with the source MAC address matching the specified MAC address. 
z 
Packets with the destination MAC address matching the specified MAC address. 
Compared with port mirroring, MAC-based mirroring is more precise and it can be used to monitor 
packets of specific device in the network. 
VLAN-Based Mirroring 
With VLAN-based mirroring configured, a device mirrors packets received on all ports in the specified 
VLAN to the destination port. 
Compared with port mirroring, VLAN-based mirroring is more extensive and it can be used to monitor 
packets of a specific VLAN or VLANs in the network.