国外无线网络设计方案.ppt

CAMPUSNETWORKDESIGN Wiredvs Wireless TerryGrayDirector Networks DistributedComputingUWComputing CommunicationsSeptember2001 ScopeofUWNetworking UWCampusNetworksSeattleTacomaBothell CCCMedicalCenters netdesign UWPhysiciansNetworkUWMedicalCenterHarborviewMedicalCenterPacific NorthWestGigapopPacificWaveexchangepointPacificLightRailStatewideK20Network PacificNorthwestGigapop BaselineConnectivity Shared10MbpsHDSwitched10MbpsHDSwitched10 100MbpsFDbackedbyGEswitch routerinfrastructureGoal Switched10 100FDforall GEforafewReality Cat3wireplantupgradewilltakemultipleyearsandmultiplemillionsofdollars AdvancedServices MulticastPartiallydeployedOlderroutersneedtobereplacedQoSLaissezfaire Premiumservice BestwithFDconnections VoIPNeedsQoS extra highavailabilityPOEdesirable impliesUPSinclosetsIPv6 PremiumServices Wide areaQoSchargeback PreferredaccesstoInternetforafee Lotsofinterestingpolicyandtechissues MistakesWeDidn tMake FDDItothedeskVLANsATMVarious cut thruIPswitching digressionsClaim StayingwithpureIPandEthernethasservedUWverywell CurrentStatistics AvgBackbonetraffic nearly2TB dayPeakInboundtraffic 100Mbps 40in1999 PeakOutboundtraffic 160Mbps 20in1999 Doublingtime Lessthan2years Hosts over50 000Modems over2 000Switchedsubnets 70 30 in1999 10 100FDsubnets 25 5 in1999 Cat5buildings 10 UW SBuilding SubnetStatus GigEBuildings Physics AstronomyFisheriesCenternewOceanLanderHallMcCartyHallParringtonHallEdmondsonPavillionMaryGatesHallOUGLibrary partofElectricalEngr partofHSKwingpartofHSTwingpartofJohnsonHallpartofSaverypartofThomsonHallpartof4545 SimplifiedNetworkTopology Router Router BorderRouter CoreSwitch EdgeSwitch EdgeSwitch InteriorSwitch InteriorSwitch Gigapop Internet2 Desktop Desktop Internet FedNets 4 30 300 1000 BranchSite 50 000 PBX NumberofDevices BackboneTraffic BorderTraffic1999 BorderTraffic2001 RecurringTheme ExplosiveGrowth MoreusersMoredevicesLongeruseNew bandwidth intensive applicationse g remotecollaborationtoolsaudio videostreamingtele immersiondistancelearning NetworkingHotList Campusbuilding subnetupgradesBackboneupgrades production experimental RegionalnetworkingNetworkHardeningSecurityAdvancedServicesWirelessManagement diagnostictools SuccessMetrics 10 100FDconnections xx Multicastdeployment xx QoSdeployment xx Dept lwirelesscoverage xx Routercenterhardening xx BackbonecapacityIPv6capablerouters OntoWireless WirelessCategories WirelessbyPurposePoint to PointlinksAccessnetworksWirelessbySpectrumInfraredRFOptical WirelessRFbyRange PAN HAN Personal Home Area Network BluetoothHomeRFLAN Local Area Network IEEE802 11ETSIHiperLAN2MAN Metro Area Network LMDS FixedWireless WAN Wide Area Network Ricochet R I P CDPD2 5G 3G etc etc etc LANWirelessStandards IEEE802 112 4GHz 1 2Mbps FHSS DSSSIEEE802 11b2 4Ghz 11MbpsDSSS WiFi IEEE802 11a5Ghz 54MbpsETSIHiperLAN25Ghz 54Mbps TDMAInUS alluseunlicensed ISM bands 802 11ISSUES NetworkDesign esp TopologyAccesscontrolSecurityCompatibilityInterferenceRelationtoBluetooth HomeRF etcObsolescence ROAMINGISSUES Layer2 802 11 vs Layer3 MobileIP VendorincompatibilityLANvs WANWewillsupportL2roamingwithinabuildingbydedicatingonesubnetforallaccesspointsinthebuilding PolicyIssues PartofcampusnetworkinfrastructureWanttoencouragesmall scaledeploymentswithminimumoverhead butcoordinationneededtoavoidinterferenceLarge scaledeploymentsneedtobecoordinatedbyC CCampus wideaccesscontrolpolicy UW SWirelessDeployment C CPilotProjectKaneHall Rm 130MaryGatesHallGerberdingHallOdegaardUndergraduateLibraryOtherwirelessprojectsCS C C Business MCIS PilotProjectObjectives Provide11Mbcoveragethroughoutselectedfacilities Allowroamingwithinfacilityspace Developsuitablepolicies Gainoperationalexperience PilotProjectLessonsLearned Successdependsoncooperationw dep tsIttakesmorewirethanyouthink SitesurveysuseSSH SSL etc Technologystillevolving2 4GHzphonesinterferebadly Wiredvs WirelessIssues ServersuitabilityPerformancePerformancevariationPrice PerformanceInterferenceTechnologymaturityAdvancedservicesSecurity 802 11a Successor FasterShorterdistanceMorepowerconsumptionProbablywon treplace802 11bProbablyneedWAPsforboth InfrastructureRequirements Conclusions Wirelessisveryaddictive Itwillbeverypopular Itwillbeveryproblematic Thedusthasnotsettled Inoffices itisnotareplacementforwired Inclassrooms lounges etc itis butthatstillrequiressomewiredinfrastructure WirelessReferences OpenGroup www openwirelessdata orgWirelessEthernetCompatibilityAlliance WECA WirelessLANAssociation WLA