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1、QoSissuesintheResearchandAcademicNetworks:ThecaseofGRNETChristosAnastasiosMichaelMichaelDimitrisChristos1,21,21,211,21,3BourasKaraliotasOikonomakosParaskevasPrimpasSintoris1ResearchAcademicComputerTechnologyInstitute,Ν.ΚazantzakiStr.,PatrasUniversity26500Rion,Patras,Greece&2DepartmentofComputerEn
2、gineeringandInformatics,UniversityofPatras,26500Rion,Patras,Greece&3DepartmentofElectricalEngineeringandComputersTechnology,UniversityofPatras,26500Rion,Patras,GreeceTEL:+302610{960375,960440,960351,960308,960316}FAX:+302610960358E-MAIL:bouras@cti.gr,karaliot@cti.gr,moikonom@cti.gr,mparask@cti.gr
3、,primpas@cti.gr,sintoris@cti.grAbstractstandardizedbyIETF.ThefirstoneiscalledIntegratedThispaperdescribesthedesignandtheServices(IntServ)andthesecondDifferentiatedimplementationofQoSservicesinahighspeedServices(DiffServ)[1].Theyfollowdifferentbackbonenetworkaswellasamanagementtoolforphilosophyast
4、heyapproachthetopicofQualityoftheservice.TheservicesweredesignedtakingServicefromdifferentpointsofview.TheIntServadvantageoffeaturesprovidedbytheMPLSarchitecturetriestoprovideabsoluteguaranteesviatechnologyandalsobyusingtheDiffServarchitecture.resourcereservationsacrossthepathsthatthetrafficThesu
5、pportedQoSservicesincludetheIPPremiumclassfollows.ThemainprotocolthatworkswiththisthattriestoprovidezeropacketlossaswellasarchitectureistheReservationProtocol(RSVP)anditsminimumdelayandjitterandtheLessThanBestEffortoperationisquitecomplicated.Ontheotherhand,service.Inadditionweimplementedamanagem
6、entDiffServarchitectureismoreflexibleandefficientasittoolfortheservice.ThescopeofthistoolistoallowtriestoprovideQualityofServiceviaadifferenttheuserstomanagetheirQoSrequests(makeanewapproach.Itclassifiesallthenetworktrafficintoone,edit,deleteorviewarequest).Alsothetoolclassesandtriestotreateachcl
7、assdifferently,performsadmissioncontrolandproducestheaccordingtothelevelofQoSguaranteesthateverynecessaryconfigurationthatmustbeappliedontheclassneeds.InDiffServarchitecturehasbeenproposednetworkinordertoimplementevery
