No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
Rate and give feedback:
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).
VLAN Overview

VLAN Overview


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 but cannot communicate directly with hosts in other VLANs. Therefore, broadcast packets are confined to within a single VLAN.


Ethernet technology allows data communication over shared media through Carrier Sense Multiple Access/Collision Detection (CSMA/CD). When an Ethernet network has a large number of hosts, collision becomes a serious problem and can lead to broadcast storms. This can degrade network performance or even result a complete breakdown. Using switches to connect LANs can mitigate collisions, but cannot isolate broadcast packets or improve network quality.

VLAN technology divides a physical LAN into multiple VLANs to isolate broadcast domains. Hosts within a VLAN can only directly communicate with hosts in the same VLAN. They must use a router to communicate with hosts in other VLANs.

Figure 4-1  VLAN networking

Figure 4-1 shows a typical VLAN networking environment. Two switches are deployed in different locations (for example, on different floors of a building). Each switch is connected to two PCs belonging to different VLANs, which likely belong to different entities or companies.


VLAN technology offers the following benefits:
  • Limits broadcast domains. This conserves bandwidth and improves network efficiency.
  • Enhances LAN security. Packets from different VLANs are transmitted separately. Hosts in a VLAN cannot communicate directly with hosts in another VLAN.
  • Improves network robustness. A fault in a VLAN does not affect hosts in other VLANs.
  • Allows for flexible groups. With VLAN technology, hosts in different geographical locations can be grouped together, simplifying network construction and maintenance.
Updated: 2019-08-21

Document ID: EDOC1000142081

Views: 275952

Downloads: 421

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Previous Next