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S12700 V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Overview of VLANs

Overview of VLANs

Definition

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

Purpose

In the early stage, 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, both collisions and broadcast storms become a serious problem, affecting network performance and in some cases causing the network to completely break down. Although using switches to connect LANs can prevent collisions, they cannot isolate broadcast packets or improve network quality.

VLAN technology divides a physical LAN into multiple VLANs to isolate broadcast domains. Because each VLAN functions as a separate broadcast domain, hosts can communicate directly with other hosts only if they are in the same VLAN.

Figure 4-1  VLAN networking

Figure 4-1 shows a simple 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 may belong to different entities or companies.

Benefits

VLAN technology offers the following benefits:
  • Limits scope of broadcast domains: The scope of broadcast domains is limited to conserve bandwidth and improve network efficiency.
  • Enhances LAN security: Packets from different VLANs are transmitted separately, preventing hosts in a VLAN from communicating directly with hosts in another VLAN.
  • Improves network robustness: A fault in one 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.
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Updated: 2019-01-18

Document ID: EDOC1100038103

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