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DES-3200-10/18/28/28F Layer 2 Ethernet Managed Switch User Manual
Port Mirror
The Switch allows you to copy frames transmitted and received on a port and redirect the copies to another port. You
can attach a monitoring device to the mirrored port, such as a sniffer or an RMON probe, to view details about the
packets passing through the first port. This is useful for network monitoring and troubleshooting purposes.
To view this window, click Layer 2 Features > Port Mirror:
Figure 3 - 39. Port Mirror window
To configure a mirror port:
1. Change the status to Enabled.
2. Select the Target Port, which receives the copies from the source port.
3. Select the Source Port from where the frames come from.
4. Click Apply to let the changes take effect.
NOTE: You cannot mirror a fast port onto a slower port. For example, if you try to mirror the
traffic from a 100 Mbps port onto a 10 Mbps port, this can cause throughput problems. The port
you are copying frames from should always support an equal or lower speed than the port to
which you are sending the copies. Also, the target port for the mirroring cannot be a member of
a trunk group. Please note a target port and a source port cannot be the same port.
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