Configuring port mirroring, Overview, Terminology – H3C Technologies H3C WX5500E Series Access Controllers User Manual
Page 87: Mirroring source, Mirroring destination, Mirroring direction, Mirroring group
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Configuring port mirroring
This chapter describes how to configure port mirroring.
Overview
Port mirroring refers to copying packets passing through a port or CPU to a monitor port connected to a
monitoring device for packet analysis.
Terminology
This section describes the concepts of port mirroring.
Mirroring source
The mirroring source can be one or more monitored ports or the CPUs. Packets (called "mirrored
packets") passing through these ports are copied to a port connected to a monitoring device for packet
analysis. Such a port or CPU is called a "source port or CPU" and the device where the port or CPU
resides is called a "source device".
Mirroring destination
The mirroring destination is the destination port (also known as the monitor port) of mirrored packets. It
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 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.
NOTE:
On the WX5540E switching engine, if incoming traffic is mirrored, the mirrored traffic is sent with the
same VLAN tag (if any) as the original traffic. If the outgoing traffic is mirrored, the mirrored traffic carries
the same VLAN tag as the original traffic did before it was sent out of the mirroring ports.
Mirroring group
Mirroring groups implement port mirroring. They can be one of the following types: local, remote source,
and remote destination. For more information about mirroring groups, see "