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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.
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VLAN Overview

VLAN Overview

Definition

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.

Purpose

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.

Benefits

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.
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Updated: 2019-08-21

Document ID: EDOC1000142081

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