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Page de résumé pour ULgetd-01212009-135757

Auteur : Balon, Simon
E-mail de l'auteur : balon@run.montefiore.ulg.ac.be
URN : ULgetd-01212009-135757
Langue : Anglais/English
Titre : Contributions to Traffic Engineering and Resilience in Computer Networks
Intitulé du diplôme : Doctorat en sciences de l'ingénieur
Département : FSA - Département d'électricité, électronique et informatique
Jury :
Nom : Titre :
BONAVENTURE, Olivier Membre du jury/Committee Member
BOUTABA, Raouf Membre du jury/Committee Member
FORTZ, Bernard Membre du jury/Committee Member
GUERIN, Roch Membre du jury/Committee Member
WOLPER, Pierre Président du jury/Committee Chair
LEDUC, Guy Promoteur/Director
Mots-clés :
  • Resilience
  • ISIS
  • Route reflectors
  • Routing optimization
  • OSPF
  • IGP
  • BGP
  • Hot-potato traffic
  • MPLS
  • Computer Networks
  • Traffic Engineering
  • Routing protocols
Date de soutenance : 2008-11-07
Type d'accès : Public/Internet
Résumé :

The Internet traffic is constantly increasing following the emergence of new network

applications like social networks, peer-to-peer, IP phone or IP television. In addition,

these new applications request better path availability and path quality.

Indeed the efficiency of these applications is strongly related to the quality of the underlying network.

In that context network operators make use of traffic engineering techniques

in order to improve the quality of the routes inside their network, but also

to reduce the network cost of increased traffic handling with a better utilization of existing resources.

This PhD thesis covers several topics of Traffic Engineering and

Fast Restoration in IP/MPLS networks.

Our first contribution is related to the definition of a well-engineered network. In the literature

mathematical formulation of Traffic Engineering (TE) requirements are very diverse.

We have thus performed a comparative study of many objective functions, in order to differentiate them and

choose in a rational way the one that best reflects Traffic Engineering goals.

We have also designed a method approaching optimal TE, whereby we divide

the traffic matrix in N sub-matrices and route them independently, based on the derivatives of the objective function.

The second topic addressed in this work concerns link weight optimizers (LWOs).

Link weight optimization is the traffic engineering {it "standard"} technique in networks running

link state routing protocols (which are widely used in transit networks).

These link weight optimizers suffer from several limitations due to the BGP (Border Gateway Protocol) Hot-Potato

rule, which is basically not considered by such optimizers.

Therefore we have proposed a BGP-aware link weight optimization method that takes problematic Hot-Potato effects

into account, and even turns them into an advantage. We have also studied how LWOs

behave in big networks which have to use BGP route reflectors. Finally we have studied

whether forwarding loops can appear or not when traffic is split among multiple

equivalent egress routers, an optional BGP feature that we did use in our Hot-Potato aware LWO.

Our last contribution concerns network resilience. We have proposed a solution for a rapid recovery from a link or node failure

in an MPLS network. Our solution allows a decentralized deployment combined with a minimal bandwidth usage while requiring only

reduced amount of information to flood in the network. This

method is the first that makes possible a decentralized deployment combined

with an optimal resource consumption.

To easily simulate and test the methods proposed in this work, we have also contributed to the development of TOTEM - a

TOolbox for Traffic Engineering Methods.

Autre version : ftp://ftp.run.montefiore.ulg.ac.be/pub/RUN-BK08-01.pdf
Fichiers :
Nom du fichier Taille Temps de chargement évalué (HH:MI:SS)
Modem 56K ADSL
[Public/Internet] RUN-BK08-01.pdf 2.31 Mb 00:05:29 00:00:12

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