DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual
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The Switch allows you to copy frames transmitted and received on a port and redirect the c opies to anot her por t. 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 monitori ng and troubleshooting purposes.
To view this window, click L2 Features > Port M irror as shown below:
Figure 3 - 55 Port Mirror window
To configure a mirror port:
1. Change the status to Enabled.
2. Select the Source Port from where you want to the frames to come from .
3. Select the Target Port, which receives the copies from the source port.
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 m irror the
traffic from a 100 Mbps port onto a 10 Mbps port, this can cause throughput problems. T he port
you are copying frames from should always support an equal or lower speed than t he port to
which you are sending the copies. Also, the target port for the m irror ing cann ot b e a m ember of
a trunk group. Please note a target port and a source port cannot be the s ame port.