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Approaches and Tools for Network QoS Automation

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Congestion canneverbeavoidedinnetworksofnowadays,whatevertheproposed design andtheusedtechnologies,forthesimplereasonthatwecanneverensure that thebandwidthofeachuplinkisgreaterthanthesumofbandwidthsofits downlinks.Whereallflowsandapplicationswillcontendforavailablebandwidth, especially onmedium-sizedandlargenetworksofbothenterprisesandservice providers. However,whatmakesthetargetofdeployinganadequateQoSmorecomplex to achieve,innext-generationnetworksisthedynamicbehaviorofsomeapplica- tions, thehighestimportanceofensuringtherequiredbandwidthanddelay,the networkdesigncomplexity,andthenon-complianceofconfigurationregarding norms andbestpracticesofnetworkingfield. In thisthesis,wewilldiscussthemostimportantrelatedworksintheautoma- tion ofQualityofService.Also,wewillcomparethemandextracttheadvantages and limitationsofeachapproach.*** La congestionnepeutjamais ˆetre ´evit´ee danslesr´eseaux d’aujourd’hui,quels que soientlaconceptionpropos´ee etlestechnologiesutilis´ees, pourlasimplerai- son quenousnepouvonsjamaisgarantirquelabandepassantedechaqueliaison montante estsup´erieure `a lasommedesbandespassantesdesesliaisonsdescen- dantes. O`u touslesfluxettouteslesapplicationssedisputerontlabandepassante disponible, enparticuliersurlesr´eseaux moyensetgrandsdesentreprisesetdes fournisseurs deservices. Cependant, cequirendl’objectifded´eploiement d’uneQoSad´equate plus complexe `a atteindre,danslesr´eseaux denouvelleg´en´eration, c’estlecomporte- ment dynamiquedecertainesapplications,laplusgrandeimportanced’assurerla bande passanteetled´elai requis,lacomplexit´e delaconceptiondur´eseau, etla non-conformit´e delaconfigurationparrapportauxnormesetmeilleurespratiques du domainer´eseau. Dans cememoire,nousdiscuteronsdestravauxlesplusimportantsdansledo- maine del’automatisationdelaqualit´e deservice.Deplus,nouslescomparerons et entireronslesavantagesetleslimitesdechaqueapproche.

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M BELEDAHL ALAA EDDINE Encadreur

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