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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Introduction to VLAN

Introduction to VLAN

This section describes definition, purpose and benefits of VLAN.

Definition

The Virtual Local Area Network (VLAN) technology divides a physical LAN into multiple broadcast domains, each of which is called a VLAN. Hosts within a VLAN can communicate with each other, while hosts in different VLANs cannot directly communicate with each other. Therefore, the broadcast packets are limited in each VLAN.

Purpose

The Ethernet technology is used to share communication media and data based on the Carrier Sense Multiple Access/Collision Detection (CSMA/CD). If there are a large number of hosts on an Ethernet network, collision becomes a serious problem and can lead to broadcast storms. As a result, network performance deteriorates. Switches can be used to connect LANs, preventing collision. However, broadcast packets cannot be isolated and network quality cannot be improved.

The VLAN technology divides a physical LAN into multiple broadcast domains, each of which is called a VLAN. Hosts within a VLAN can communicate with each other, while hosts in different VLANs cannot communicate with each other directly. Therefore, the broadcast packets are limited in each VLAN.

NOTE:

In this document, the Layer 2 switch is referred to as the switch for short.

Figure 7-19  Networking diagram for a typical VLAN application

Figure 7-19 shows the networking diagram for a typical VLAN application. Two switches are placed in different locations (for example, in different floors of a building). Each switch is connected to two PCs that respectively belong to different VLANs (for example, different companies).

Benefits

The VLAN technology brings the following benefits to customers:
  • Limits broadcast domains. A broadcast domain is limited in a VLAN. This saves bandwidth and improves network processing capabilities.
  • Enhances network security. Packets from different VLANs are separately transmitted. Hosts in a VLAN cannot directly communicate with hosts in another VLAN.
  • Improves network robustness. A fault in a VLAN does not affect hosts in other VLANs.
  • Flexibly sets up virtual groups. With the VLAN technology, hosts in different geographical areas can be grouped together. This facilitates network construction and maintenance.
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Updated: 2019-01-11

Document ID: EDOC1000176006

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