Configuring Local Port Mirroring; Establishing The Configuration Task - Huawei AR3200 Series Configuration Manual

Huawei AR3200 Series Enterprise Routers
Configuration Guide - Device Management
Local Mirroring Specifications
On the AR3200 configured with local mirroring, only one observing interface can be configured.
The observing interface can only be configured on LAN-side Ethernet interfaces. The packets
on multiple interfaces can be mirrored to one observing interface.
In local port mirroring, the AR3200 supports inter-board mirroring. That is, the observing
interface and mirrored interface can be on different LPUs of a router.
In local flow mirroring, when a WAN-side interface is used as a mirrored interface, the
AR3200 supports inter-board mirroring. When a LAN-side interface is used as a mirrored
interface, the AR3200 does not support inter-board mirroring.
Remote Mirroring Specifications
Only one observing server can be configured, and there must be a reachable route from the
mirrored interfaces to the observing server. The packets on multiple mirrored interfaces can be
mirrored to one observing server.

3.3 Configuring Local Port Mirroring

To monitor and analyze all the packets passing through the mirrored interface that is located on
the same AR3200 as the observing interface, configure local port mirroring on the AR3200.

3.3.1 Establishing the Configuration Task

Before configuring local port mirroring, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the required data. This will help you complete
the configuration task quickly and accurately.
Applicable Environment
An intranet has high requirements for information security and privacy protection. You can
configure mirroring on an interface to monitor incoming and outgoing data packets. The
management server that has the monitoring software installed can capture these packets for
analysis and fault location.
To monitor and analyze all the packets passing through the mirrored interface that is located on
the same AR3200 as the observing interface, configure local port mirroring on the AR3200.
Pre-configuration Tasks
Ensuring that the link layer protocol status of interfaces is Up
Issue 03 (2011-11-27)
NOTE
Observing and mirrored interfaces are configured on the same device.
The packets on the mirrored interface are copied to the observing interface; therefore, the observing
interface is considered as the outbound interface of the packets. In this case, the discarded packets on the
mirrored interface are not counted.
When you configure the observing interface and mirrored interface, pay attention to the interface
bandwidth. For example, if a GE interface is used as the mirrored interface and an Ethernet interface is
used as the observing interface, the observing interface has no sufficient capability to receive packets and
mirroring packets may be lost.
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