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A scalable overlay multicast architecture for large-scale applications

We propose a two-tier overlay multicast architecture (TOMA) to provide scalable and efficient multicast support for a variety of group communication applications. In TOMA, multicast service overlay network (MSON) is advocated as the backbone service domain

AScalableOverlayMulticastArchitectureforLarge-ScaleApplications

LiLao1,Jun-HongCui2,MarioGerla1

llao@cs.ucla.edu,jcui@cse.uconn.edu,gerla@cs.ucla.edu

1

2ComputerScienceDepartment,UniversityofCalifornia,LosAngeles,CA90095ComputerScience&EngineeringDepartment,UniversityofConnecticut,Storrs,CT06029

TechnicalReportTR040008

LastUpdate:July2004

ComputerScienceDepartment

UCLA

Abstract

Weproposeatwo-tieroverlaymulticastarchitecture(TOMA)toprovidescalableandef cientmulticastsupportforavarietyofgroupcommunicationapplications.InTOMA,multicastserviceoverlaynetwork(MSON)isadvocatedasthebackboneservicedomain,whileendusersintheaccessdomainsformanumberofsmallclusters,inwhichanapplication-layermulticastprotocolisusedforthecommunicationbetweentheclusteredendusers.Ourtwo-tierarchitectureisabletoprovideef cientresourceutilizationwithlesscontroloverhead,especiallyforlarge-scaleapplications.Italsoalleviatestheforwardingstatescalabilityproblemandsimpli esmulticasttreeconstructionandmaintenancewhentherearelargenumbersofgroupsongoinginthenetworks.TohelptheMSONprovideref cientlyplanbackboneserviceoverlay,weprovideseveraldimensioningalgorithmstolocateproxies,selectoverlaylinks,andallocatelinkbandwidth.Basedonourarchitecture,wealsosuggestacost-basedpricingmodelfortheoverlayISPtochargemulticastgroups.ThispricingmodelwouldprovidekeyincentivesforbothserviceprovidersandclientstoadoptourproposedTOMAservice.ExtensivesimulationstudiesareconductedandtheresultsdemonstratethatTOMAperformswellinseveralcommonscenarios,itprovidesef cientmulticasttransmissioncomparabletoIPmulticast,andisscalabletogroupsizeaswellastothenumberofco-existinggroups.Wealsorunexperimentsandshowthatourdimensioningalgorithmscouldef cientlyplanthenetworkresourceswithlittlepenalty.Webelievethattheinventionofourpractical,comprehensive,andpro tablemulticastservicemodelwouldsigni cantlyfacilitatethemulticastwidedeployment,makingmulticastserviceoverlayfrommythtoreality.

1Introduction

Overtheyears,therehavebeentremendouseffortstoprovidemulticast(orgroupcommunication)support,rangingfromIPmulticasttorecentlyproposedapplication-layermulticast.IPmulticastutilizesatreedeliverystructurewhichmakesitfast,resourceef cientandscalewelltosupportverylargemulticastgroups.However,evenafterapproximatelytwodecadessincetheinceptionofIPmulticast,itisstillfarfrombeingwidelydeployedontheInternet.Thisisduetomanytechnicalreasonsaswellasmarketingreasons[13].Themostcriticalonesinclude:thelackofascalableinter-domainroutingprotocol,thestatescalabilityissuewithalargenumberofgroups,thelackofsupportinaccesscontrol,therequirementofglobaldeploymentofmulticast-capableIProutersandthelackofappropriatepricingmodels,asmakeInternetServiceProviders(ISPs)reluctanttodeployandprovidemulticastservice.

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