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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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.
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Overview of VLANs

Overview of VLANs


Virtual Local Area Network (VLAN) technology divides a physical LAN into multiple broadcast domains, each of which is called a VLAN.


Ethernet technology implements data communication over shared media based on 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. As a result, network performance deteriorates, or can even result in 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 communicate with each other but cannot communicate directly with hosts in other VLANs. Consequently, broadcast packets are confined to within a single VLAN.

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. Broadcast domains are limited to conserve bandwidth and improve 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 flexible definition of virtual groups. With VLAN technology, hosts in different geographical locations can be grouped together, thereby simplifying network construction and maintenance.
Updated: 2019-10-18

Document ID: EDOC1000178310

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