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1、Re-architectedCloudDataCenterNetworksandTheirImpactontheFutureInternetChristianEsteveRothenbergUniversityofCampinas(UNICAMP),CidadeUniversitária"ZeferinoVaz"DistritodeBarãoGeraldo-Campinas-SãoPaulo,CEP13083-852,Brazilchesteve@dca.fee.unicamp.brAbstract.Large-scaleInternetdatacen
2、ters(DC)areempoweringtheneweraofcloudcomputing,astillevolvingparadigmthatpromisesinfinitecapacity,noup-frontcommitmentandpay-as-you-goservicemodels.Ongoingresearchtowardsprovidinglow-costpowerfulutilitycomputingfacilitiesincludeslarge-scale(geo)-distributedapplicationprogramming
3、,innovationintheinfrastructure(e.g.energymanagement,packing),andre-thinkinghowtointerconnectthousandsofcom-modityPCs.Inthischapter,wefocusonthelatterandreviewdevelopmentsthataretakenplaceinarchitectingdatacenternetworks(DCN)tomeettherequire-mentsofthecloud.Finally,wespeculateont
4、hepotentialimpactsofsuchutilitycomputingdevelopmentsinshapingthefutureInternetbydrivingincentivesofadoptionofnewprotocolsandarchitecturalchanges.1IntroductionIncontrasttotraditionalenterpriseDCsbuiltfromhigh-prize“scale-up”hardwaredevicesandservers,cloudserviceDCsconsistoflow-co
5、stcommodityserversthat,inlargenumbersandwithappropriatesoftwaresupport(e.g.virtualization),matchtheperformanceandreliabilityoftraditionalapproachesatafractionofthecost.However,thenetworkingfabricwithinthedatacenterhasnotevolved(yet)tothesamelevelsofcommoditization[1].Today’sDCsu
6、seexpensiveenterprise-classnetworkingequipmentthatrequiretediousnetworkandITmanagementpracticestoprovideefficientInternet-scaledatacenterservices.ConsolidatedonconvergedIP/Ethernettechnologies,currentDCNsareconstrainedbythetradi-tionalL2/L3hierarchicalorganizationwhichhampersthe
7、agilitytodynamicallyassignservicesprovidedbyvirtualmachines(VM)toanyavailablephysicalserver.Moreover,IPsubnettingandVLANfragmentationendupyieldingpoorserver-to-servercapacityevenwhenrelyingonexpensiveequipmentattheupperlayersofthehierarchy[7].ResourceusageinthehighlyvirtualizedC
8、loudisverydynamicduetothena-tureofcloudservices
