H3C Technologies H3C MSR 5600 - Manual (Page 182)

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Configuring port mirroring
Overview
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
The following terms are used in port mirroring configuration.
Mirroring source
The mirroring source can be one or more monitored ports, which are called "source ports." Packets
passing through them are copied to a port connecting to a monitoring device for packet analysis. (The
copies are called "mirrored packets.") The device where the mirroring source resides is called a "source
device."
Mirroring destination
The mirroring destination is the destination port, also known as the monitor port, of mirrored packets and
connects to the monitoring device. The device where the monitor port resides is called the "destination
device." Mirrored packets are sent out of the monitor port to the monitoring device.
A monitor port might receive multiple duplicates of a packet in some networks 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 are
received on Port 1.
Mirroring direction
The mirroring direction specifies 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 received and sent on a mirroring source.
Mirroring group
Port mirroring is implemented through mirroring groups.
Local port mirroring
In local port mirroring, the source device is directly connected to the data monitoring device and can act
as the destination device to forward mirrored packets to the data monitoring device. The mirroring source
and 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."