H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 67)

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Configuring port mirroring
Overview
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.
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 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, which fall into local, remote source, and remote
destination mirroring groups. For more information about the mirroring groups, see " Port mirroring
classification and implementation ."
Remote probe VLAN
Used for Layer 2 remote port mirroring, a remote probe VLAN specially transmits mirrored packets to the
destination device. For more information, see " Port mirroring classification and implementation ."
Port mirroring classification and implementation
According to the locations of the mirroring source and the mirroring destination, port mirroring includes
local port mirroring and remote port mirroring.