Specifications

Network Topologies
2-4 Network Configuration
Infrastructure Wireless LAN for Roaming Wireless PCs
TheBasicServiceSet(BSS)definesthecommunicationsdomainforeachaccesspointandits
associatedwirelessclients.TheBSSIDisa48‐bitbinarynumberbasedontheaccesspoint’s
wirelessMACaddress,andissetautomaticallyandtransparentlyasclientsassociatewiththe
accesspoint.TheBSSID
isusedinframessentbetweentheaccesspointanditsclientstoidentify
trafficintheservicearea.
TheBSSIDisonlysetbytheaccesspoint,neverbyitsclients.Theclientsonlyneedtosetthe
ServiceSetIdentifier(SSID)thatidentifiestheservicesetprovided
byoneormoreaccesspoints.
TheSSIDcanbemanuallyconfiguredbytheclients,canbedetectedinanaccesspoint’sbeacon,or
canbeobtainedbyqueryingfortheidentity ofthenearestaccesspoint.Forclientsthatdonot
needtoroam,settheSSIDforthewireless
cardtothatusedbytheaccesspointtowhichyouwant
toconnect.
Awirelessinfrastructurecanalsosupportroamingformobileworkers.Morethanoneaccess
pointcanbeconfiguredtocreateanExtendedServiceSet(ESS),asshowninFigure 2‐3.Byplacing
theaccesspointsso
thatacontinuouscoverageareaiscreated,wirelessuserswithinthisESScan
roamfreely.AllwirelessnetworkcardadaptersandAccessPoint3000s,withinaspecificESS,
mustbeconfiguredwiththesameSSID.
Figure 2-3 Infrastructure Wireless LAN for Roaming
File Server
Switch
Desktop PC
<BSS2>
Seamless Roaming
<ESS>
Switch
<BSS1>
Access Point
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DC
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Notebook with Wireless
PC Card Adapter
Access Point
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PC with Wireless
PCI Adapter
Notebook with Wireless
PC Card Adapter