BCMSN30S06L05 实施WLAN.ppt

WirelessLANs,ImplementingWLANs,CiscoWLANImplementation,AutonomousWLANsolutionAutonomousaccesspointsLightweightWLANsolutionLightweightaccesspointsWLANcontroller,AutonomousWLANSolution,AutonomousaccesspointCiscoIOSsoftwareNetworkinfratructurePoEswitchandrouterWirelessDomainServices(WDS)ManagementsupportWirelessLANSolutionEngine(WLSE)CentralizedmanagementAcessControlServer(ACS)RADIUS/TACACS+security,LightweightWLANSolution,LightweightaccesspointNetworkinfratructurePoEswitchandrouterCiscoWirelessLANcontroller(WLC)AccesspointconfigurationCiscoWirelessControlSystem(WCS)ManagementLocationapplianceLocationtrackingCiscoSecureAcessControlServer(ACS)RADIUS/TACACS+security,LightweightWLANSolution,LightweightAccessPointProtocol,Real-timeframeexchangeandcertainreal-timeportionsofMACmanagementareaccomplishedwithintheaccesspoint.Authentication,securitymanagement,andmobilityarehandledbyWLANcontrollers.DataandcontrolmessagesareexchangedbetweentheaccesspointandtheWLANcontrollerusingLWAPP.Controlmessagesareencrypted.AllclientdatatrafficissentviatheWLANcontroller.,LWAPP,Layer2modeLayer2LWAPPisinanEthernetframe.TheWLANcontrollerandtheaccesspointmustbeinthesamebroadcastdomainandIPsubnet.Layer3modeLayer3LWAPPisinaUDP/IPframe.TheWLANcontrollerandaccesspointcanbeinthesameordifferentbroadcastdomainsandIPsubnets.TheaccesspointmustobtainanIPaddressviaDHCP.,AssociationofAccessPointtoWLANController,AccesspointsuseLWAPPinLayer2andLayer3modetoassociatetotheWLANcontroller.InLayer3mode,theaccesspointsendsanLWAPPdiscoveryrequesttothecontrollermanagementIPaddressviaadirectedbroadcast.ThecontrollerrespondswithadiscoveryresponsefromthemanagerIPaddressthatincludesthenumberofaccesspointscurrentlyassociatedtotheaccesspointmanagerinterface.TheaccesspointchoosestheaccesspointmanagerIPaddresswiththeleastnumberofaccesspointsandsendsthejoinrequest.AllsubsequentcommunicationistotheWLANcontrolleraccesspointmanagerIPaddress.,CiscoAironetWLCs,ScalabilityIntegratedRadioResourceManagement(RRM)Zero-configurationdeploymentMultilayeredsecurityIntrusiondetection,location,andcontainmentMobilitymanagementReliabilityIntuitivemanagementinterfaces,WLC2000,WLC4400,ComparisonoftheWLANConfiguration,AutonomousWLANsolutionAutonomousaccesspointsConfigurationofeachaccesspointIndependentoperationCentralizedmanagementviaWLSEAccesspointredundancy,LightweightWLANsolutionLightweightaccesspointsConfigurationviaWLCDependentonWLCCentralizedmanagementviaWCSWLCredundancy,WLANComponents,CiscoUnifiedWirelessNetwork,CiscoUnifiedWirelessNetwork(Cont.),FeaturesIndustrysbestrangeandthroughputEnterprise-classsecurityManyconfigurationoptionsSimultaneousairmonitoringandtrafficdeliveryWideareanetworkingforoutdoorareas,BenefitsZero-touchmanagementNodedicatedairmonitorsSupportforalldeploymentscenarios(indoorandoutdoor)Securecoveragetoadvancedservices,MobilityPlatform,CiscoAironetAccessPointsandBridges,IndoorAccessPoints,1130AG,1000,IndoorRuggedAccessPoints,1500,1240AG,1230AG,OutdoorAccessPoints/Bridges,1400,1300,PoweroverEthernet,2005CiscoSystems,Inc.Allrightsreserved.,PoweroverEthernet(PoE),SendingoperatingpoweroverEthernetCategory5cablePower-sourcingequipment(PSE)Switches,powerinjectorPowereddevicesAccesspoints,IPphonesUpto15.4WpowerperportDistancesupto100metersAlternative:ACpoweradapter,PoEDelivery,Pair1,2and3,6,Pair4,5and7,8,Twoapprovedmethodsfor“inserting”powerintoEthernetcable:,DetectionofpowerrequirementsIEEE802.3afCiscoproprietaryinlinepower,MidspanPowerInjection,Usespairs4,5and7,8Requireseight-wirecablingDoesnotextend100-mtotallengthlimitNotpossiblefor1000TX,Power-SourcingEquipment,PowerinjectorAIR-PWRINJ3/AIR-PWRINJ-FIBPoweringswitchCiscoCatalyst3560-PS/3750-PSCiscoExpressCE500-LC/CE500-PCCiscoCatalyst4500/6500switchwithinlinepowerlinecardsRoutermoduleNM-16ESW-PWRRoutercardHWIC-4ESW-POERouterwithPoEsupport,InvestmentProtection,Ciscohasshippedover18millionportswithPoEinstalled.NewCiscodevices(PSEsandpowereddevices)supportbothPoEmethods.IEEE802.3afCiscoproprietaryPoEExamples:Accesspoints1131AG,1242AGSwitches:3560,3750Router:1812,HWIC-4ESW-POEAutomaticdetection;noconfigurationisrequired.,PoESwitch,switch(config-if)#powerinlineauto|never,DisplayPoEstatistics,switch#showpowerinlineinterface,switch#showpowerinlineAvailable:370.0(w)Used:61.6(w)Remaining:308.4(w)InterfaceAdminOperPowerDeviceClassMax(Watts)-Gi0/1autooff0.0n/an/a15.4Gi0/2autoon15.4IeeePD315.4Gi0/3autooff0.0n/an/a15.4Gi0/4autoon15.4IeeePD315.4Gi0/5autooff0.0n/an/a15.4Gi0/6autoon15.4IeeePD315.4Gi0/7autooff0.0n/an/a15.4Gi0/8autoon15.4IeeePD315.4,PoEconfiguration,PoESwitchPortStatus,Antennas,2005CiscoSystems,Inc.Allrightsreserved.,AntennaConcepts,DirectionalityOmnidirectionalantennas(360degreecoverage)Directionalantennas(limitedrangeofcoverage)GainMeasuredindBi(gainovertheoreticalisotropic)Moregainmeansfocusingincertaindirections,limitedrangeofcoveragePolarizationVerticalpolarizationforWLAN,AntennaTheory,Atheoreticalisotropicantennahasaperfect360-degreeverticalandhorizontalbeamwidth.Referenceforallantennas.,OmnidirectionalAntenna:Dipole,Energylobes“pushedin”fromthetopandbottomHighergainSmallerverticalbeamwidthLargerhorizontallobeTypicaldipolepattern,2-dBiDipoleStandardRubberDuck,DirectionalAntenna,Lobesarepushedinacertaindirection,causingtheenergytobecondensedinaparticulararea.Verylittleenergyisinthebacksideofadirectionalantenna.,6.5-dBiDiversityPatchWallMount55degrees,Connectorized5-GHzAntennas,Cisco5-GHzRubberAntenna(FlatwithBlueDot),Cisco2.4-GHzRubberAntenna(Round,NoDot),5-GHz(802.11a)antennashaveblueIDmarkers.Dual-band(2.4-GHzand5-GHz)antennashaveyellowdots.,CiscoAccessPoint/BridgeAntennas,MultipathDistortion,Multipathdistortion(aformofradiodegradation)occurswhenradiosignalsbounceoffmetalobjectsinaroom,suchasmetalcabinetsorceilinglights.OFDMovercomesmultipathdistortionthroughparallelfrequencyuse.,Multiplesignalsatreceivercausedistortionofthesignal.Asradiowavesbounce,theyarriveatthereceiverslightlydelayed,combiningwiththeoriginalsignal,causingdistortion.Diversitysystemsusetwoantennasindifferentpositionstoreducethedegradation.,DefinitionofDecibel,Decibel(dB)RatioofonevaluetoanotherdBm=Powerbasedon1milliwatt0dBm=1mWdBi=Antennagainbasedonisotropicantenna,EffectiveIsotropicRadiatedPower,TransmitpowerisratedindBmormW.PowercomingoffanantennaisEffectiveIsotropicRadiatedPower(EIRP).FCCandETSIuseEIRPforpowerlimitsinregulationsfor2.4-GHzand5-GHzWLANs.EIRPdBm=PowerdBmcable_lossdb+antenna_gaindBi,AntennaCableLoss,Usecablethatissuppliedwiththeantenna,avoidinglongcablerunswhenpossible.Ciscooffersthesecables:LMR400-stylecables20and50feetTotallossof1.3and3.4dB,respectivelyLMR600-stylecables100and150feetTotallossof4.4and6.6dB,respectively,LMR400,LMR600,Point-to-multipointFCCallowsincreasingthegainofanantenna/cablesystemifthetransmitterpowerisreducedbelow30dBmina1:1ratio.Reducetransmitpowerbelowmaximumof30dBmby1dBmandincreaseantenna/cablesystemgainby1-dBi.,2.4-GHzEIRPRulesforFCC-GovernedAreas,Point-to-Multipoint,Theabovevaluesreflectthe1:1rule.,CurrentlyETSIallowsamaximumof20dBmEIRPonpoint-to-multipointandpoint-to-pointinstallations17dBmmaximumtransmitterpowerwith3dBiingainattributedtoantennaandcablecombination.Reducetransmitpowerbelowmaximumof17dBmby1dBmandinc