3Com S7902E, Configuration Manual

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1-2
The following subsections describe how local port mirroring, Layer 2 remote port mirroring, and Layer 3
remote port mirroring are implemented.
Local port mirroring
Local port mirroring is implemented through a local mirroring group. In local port mirroring, packets
passing through a port (mirroring port) are mirrored to the monitor port located on the same device.
Figure 1-1 Local port mirroring implementation
As shown in Figure 1-1 , packets of the mirroring port are mirrored to the monitor port for the data
monitoring device to analyze.
The mirroring ports and the monitor port in a local mirroring group can be located on different LPUs of a
same device.
Layer 2 remote port mirroring
Layer 2 remote port mirroring is implemented through the cooperation between a remote source
mirroring group and a remote destination mirroring group as shown in Figure 1-2 .
Figure 1-2 Layer 2 remote port mirroring implementation
On the network shown in Figure 1-2 , a remote source mirroring group is created on the source device
and a remote destination mirroring group is created on the destination device. The source device