Huawei AR150 series - Introduction to Mirroring; Mirroring Features Supported by the AR150;200; Local Port Mirroring

4.1 Introduction to Mirroring
This section describes the principle and concepts of mirroring.
Definition
Mirroring is a function that copies the packets on the mirrored interface (source interface) to the
observing interface (destination interface). When the observing interface is connected to a
monitoring device, you can use the monitoring device to analyze the packets copied to the
observing interface for network monitoring and fault troubleshooting.
Terms
Mirroring is classified into port mirroring and flow mirroring. Port mirroring and flow mirroring
involve the following interfaces:
l Observing interface
An observing interface is connected to a monitoring device and is used to export the traffic
copied from the mirrored interface.
l Mirrored interface
A mirrored interface is the interface to be observed. In port mirroring, all the packets passing
through the mirrored interface are copied to the observing interface. In flow mirroring, all
the packets matching the traffic classifier rules are copied to the observing interface.
4.2 Mirroring Features Supported by the AR150/200
The AR150/200 supports local mirroring and remote mirroring.
Local mirroring includes local port mirroring and local flow mirroring. Remote mirroring
includes remote port mirroring and remote flow mirroring.
Local Port Mirroring
As shown in Figure 4-1, when the mirrored interface connected to monitored devices and the
observing interface are located on the same device, local port mirroring can be configured on
the Router to monitor and analyze the packets on the monitored devices. The Router copies the
packets passing through a mirrored interface and sends the packets to a specified observing
interface for analysis and monitoring. In port mirroring, all the packets passing through a
mirrored interface are copied to an observing interface.
Huawei AR150&200 Series Enterprise Routers
Configuration Guide - Device Management 4 Mirroring Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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