Westermo MDI-112-F4G - Manual (Page 146)

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4.12.3 Port Mirroring
Port mirroring (also called port spanning) is a tool that allows you to mirror the
traffic from one or more ports onto another port, without disrupting the flow of
traffic on the original port. Any traffic that goes in or out of the Source Port(s) will
be duplicated at the Destination Port. This traffic can then be analyzed on the
Destination port using a monitoring device or application. A network
administrator will typically utilize this tool for diagnostics, debugging, or fending
off attacks.
Port Mirror Mode: Select Enable/Disable to enable/disable Port Mirror.
Source Port: This is also known as Monitor Port. These are the ports you want to
monitor and the traffic of all source/monitor ports will be copied to
destination/analysis ports. You can choose a single port, or any combination of
ports, but you can only monitor them in Rx or TX only. Click on checkbox of the
Port ID, RX, Tx or Both to select the source ports.
Destination Port: This is also known as Analysis Port. You can analyze the traffic
of all the monitored ports at this port without affecting the flow of traffic on the
port(s) being monitored. Only one of the destination ports can be selected. A
network administrator would typically connect a LAN analyzer to this port.