WLAN拓扑.ppt

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1、WirelessLANsDescribingWLANTopologiesWLANTopologiesWirelessclientaccessMobileuserconnectivityWirelessbridgingLAN-to-LANconnectivityWirelessmeshnetworkingCombinationofbridginganduserconnectivityWLANandLANWLAN组成Ssid（servicesetid）：服务集id，一组无线设备标示，必须相同，包含在帧中发送。Bss（basics

2、erviceset）：基本服务集，包含一个ap，所有客户必须向ap申请资格。Ibss（independentbasicserviceset）：独立基本服务集，只有客户，没有无线设备。Ess：扩展服务集，包含多个ap，连接到以太网中。ServiceSetIdentifier(SSID)SSIDisusedtologicallyseparateWLANs.(使用ssid逻辑区分无线网)TheSSIDmustmatchonclientandaccesspoint.（必须匹配）AccesspointbroadcastsoneSSID

3、inbeacon.ClientcanbeconfiguredwithoutSSID.Clientassociationsteps:Clientsendsproberequest.（发送请求探针）Apointsendsproberesponse.（ap回复请求）Clientinitiatesassociation.（开始请求关联）Apointacceptsassociation.（同意关联）ApointaddsclientMACaddresstoassociationtable.Ap工作原理Ap就像一个集线器，将无线终端设备关

4、联起来，连入到无线网络，以太网络中。可以使用不同的ssid来关联vlan，使用ssid把无线客户关联到相应的vlan中。WLANAccessTopologyWirelessRepeaterTopologyWorkgroupBridgeTopologyAlternativePeer-to-PeerTopologyServiceSetsandModesAdhocmodeIndependentBasicServiceSet(IBSS)（独立基本服务集）Mobileclientsconnectdirectlywithoutanint

5、ermediateaccesspoint.InfrastructuremodeBasicServiceSet（bss）（基本服务集）Mobileclientsuseasingleaccesspointforconnectingtoeachotherortowirednetworkresources.ExtendedServicesSet（ess）（扩展服务集）TwoormoreBasicServiceSetsareconnectedbyacommondistributionsystem.RoamingThroughWirel

6、essCells（无线漫游）RoamingThroughWirelessCellsRoamingClientRoaming（漫游）RoamingwithoutinterruptionrequiresthesameSSIDonallaccesspoints.(有相同的ssid)MaximumdataretrycountexceededToomanybeaconsmissedDatarateshiftedPeriodicintervalsLayer2vs.Layer3RoamingWirelessVLANSupportMulti

7、pleSSIDsMultiplesecuritytypesSupportformultipleVLANsfromswitches802.1QtrunkingprotocolWirelessVLANSupport(Cont.)VLANspropagateacrossaccesspoints.VLANnumbersareunique.Accesspointshandleupto16VLANs.(可处理16个vlan)EnterpriseVoiceArchitectureWirelessMeshNetworkingInamesh

8、networktopology,devicesareconnectedwithredundantconnectionsbetweennodes.（在节点之间冗余连接）WirelessMeshNetworking（无线网状网）Meshaccesspointsautomaticallyesta