Configuring Port Mirroring; Terminology; Mirroring Source; Mirroring Destination - HP 1920 Gigabit Ethernet Switch Series User Manual

Configuring port mirroring

Port mirroring refers to the process of copying the packets passing through a port/VLAN/CPU 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 the mirrored packets to its connecting 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.
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Outbound—Copies packets sent out of a mirroring source.
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Bidirectional—Copies packets both received and sent on a mirroring source.
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Mirroring group

Port mirroring is implemented through mirroring groups, which include local and remote mirroring groups.
Only local mirroring groups are supported.

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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