Introduction; Mirroring Functions - Huawei V100R006C00 Configuration Manual

Quidway S5700 Series Ethernet Switches
Configuration Guide - Device Management

7.1 Introduction

This section describes the basics of mirroring.

7.1.1 Mirroring Functions

Mirroring is to copy packets to an observing port to monitor packets without affecting packet
forwarding. You can use the mirroring function for network check and troubleshooting.
Mirroring functions are classified into port mirroring, flowing mirroring, VLAN mirroring,
MAC address mirroring, and CPU mirroring.
The S5700SI does not support remote mirroring based on flows, VLANs, or MAC addresses.
Concepts
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Issue 01 (2011-07-15)
Observing port
An observing port on the S5700 is connected to a monitoring host. It is used to export the
traffic copied from a mirrored port or a flow mirroring port.
Mirrored port
A mirrored port is the interface to be observed. Incoming traffic or outgoing traffic passing
through a mirrored port is copied to an observing port.
Flow mirroring port
A flow mirroring port is a port to which traffic policies are applied. On such a port, the
incoming traffic that matches the traffic classifier in the traffic policy is copied to an
observing port.
Mirrored flow
A mirrored flow is a packet flow that runs to a flow mirroring port and is observed. When
a flow becomes a mirrored flow, it is copied to an observing port.
Mirrored VLAN
A mirrored VLAN is a VLAN to be observed. Incoming traffic or outgoing traffic passing
through a mirrored VLAN is copied to an observing port.
Mirrored MAC address
A mirrored MAC address is the source or destination MAC address of the packets to be
mirrored. The S5700 copies the traffic matching this MAC address to an observing port.
RSPAN VLAN
A Remote Switched Port Analyzer (RSPAN) VLAN is a VLAN used for remote mirroring.
When the mirrored port and the observing port are located on different switches, packets
from the mirrored port must be broadcast to the observing port through the RSPAN VLAN.
Local mirroring
The observing port and mirrored port are on the same switch.
Remote mirroring
The observing port and mirrored port are on different switches.
NOTE
The S5700 does not support the function of mirroring a flow to multiple observing ports.
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