3com WX3000 Manuel D’Utilisation
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Mirroring Configuration
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The term switch used throughout this chapter refers to a switching device in a generic sense or the
switching engine of a unified switch in the WX3000 series.
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The sample output information in this manual was created on the WX3024. The output information
on your device may vary.
Mirroring Overview
Mirroring refers to the process of copying packets of one or more ports (source ports) to a destination
port which is connected to a data detection device. Users can then use the data detection device to
analyze the mirrored packets on the destination port for monitoring and troubleshooting the network.
Figure 1-1 Mirroring
PC
Data detection
device
Network
Source port
Destination port
The device supports four kinds of port mirroring:
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Local port mirroring: a device copies packets passing through one or more source ports of the
device to the destination port.
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Remote port mirroring implements port mirroring through the remote source mirroring group and
remote destination mirroring group. The device copies the packets of the source port to the
reflector port, which then broadcasts the packets in the remote-probe VLAN. After the remote
device receives the packets, it compares the VLAN ID of the packets with that of the remote-probe
VLAN on the remote device. If the VLAN IDs are identical, the remote device forwards the packets
to the destination port of the remote destination mirroring group.
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MAC-based mirroring: a device copies packets matching a specified MAC address to the
destination port.