1 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.

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

Network

Source port

Destination port

Data detection

device

PC

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.

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.

MAC-based mirroring: a device copies packets matching a specified MAC address to the destination port.

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3Com WX3000 operation manual Mirroring Configuration, Mirroring Overview