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Configuring port mirroring
Port mirroring refers to the process of copying the packets passing through a port to the monitor port
connecting to a monitoring device for packet analysis.
Terminology
Mirroring source
The mirroring source can be one or more monitored ports, called source ports. The device where the
ports reside is called a "source device." Packets (called "mirrored packets") passing through them are
copied to a port connecting to a monitoring device for packet analysis.
Mirroring destination
The mirroring destination is the destination port (also known as the monitor port) of mirrored packets and
connects to the data monitoring device. The device where the monitor port resides is called the
"destination device". The monitor port forwards mirrored packets to its connected monitoring device.
A monitor port might receive multiple duplicates of a packet in some cases because it can monitor
multiple mirroring sources. For example, assume that Port 1 is monitoring bidirectional traffic on Port 2
and Port 3 on the same device. If a packet travels from Port 2 to Port 3, two duplicates of the packet will
be received on Port 1.
Mirroring direction
The mirroring direction indicates that the inbound, outbound, or bidirectional traffic can be copied on a
mirroring source.
• Inbound—Copies packets received on a mirroring source.
• Outbound—Copies packets sent out of a mirroring source.
• Bidirectional—Copies packets both received and sent on a mirroring source.
Mirroring group
Port mirroring is implemented through mirroring groups. The mirroring source and mirroring destination
must belong to a mirroring group.
Port mirroring implementation
HP 1910 switch series supports local port mirroring, in which case the mirroring source and the mirroring
destination are on the same device. A mirroring group that contains the mirroring source and the
mirroring destination on the same device is called a "local mirroring group."
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