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CLI-based Configuration Guide - Ethernet Switching

AR650, AR1600, and AR6100 V300R003

This document describes how to configure the components for LAN services, including link aggregation groups, VLANs, voice VLANs, MAC address tables, transparent bridging, as well as GVRP, STP/RSTP, and MSTP protocols.
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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. 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.

Purpose

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 3-1  VLAN networking

Figure 3-1 shows a typical VLAN networking environment. Device Router1 and device Router2 are deployed in different locations (for example, on different floors of a building). Each device 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. 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.
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Updated: 2019-04-12

Document ID: EDOC1100041791

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