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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.
Terminologies of port mirroring
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 the mirrored packets to its connecting monitoring device.
A monitor port may 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.
Local port mirroring implementation
According to the locations of the mirroring source and the mirroring destination, port mirroring includes
local port mirroring and remote port mirroring.
The switching engine of the HP 830 24-port PoE+ unified wired-WLAN switch supports only local port
mirroring.
In local port mirroring, 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 device is called
a local mirroring group.
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