Contribution à l'amélioration de l'efficacité des réseaux IP sur WDM en évaluant et en dépassant les limites du dimensionnement multicouche

The traffic passing through core networks grows by nearly 25% each year. To bring the costs under control, the different network layers of the network should work together to include more and more parameters during the network planning phase. This is called “multilayer network planning”. We study the multilayer network planning of static networks composed of two circuit switched layers (typically IP-over-WDM). We propose a semi-analytical model explaining the behavior of algorithms responsible for aggregation and routing in both layers. This theory allows comparing multilayer planning algorithms between them, but also explaining and enhancing their efficiency. We then describe the impact of the optical reach constraint in WDM networks on the results of a multilayer planning algorithm. Finally, we explain how these results apply to the design of future networks (dynamic and with heterogeneous optical layers)La quantité de données devant être transportée via les réseaux de cœur croit de près de 25% par an. Pour maîtriser les coûts, les différentes couches du réseau doivent mettre des informations en commun pour inclure de plus en plus de paramètres lors du dimensionnement du réseau. Cela s’appelle « dimensionnement multicouche ». Nous étudions le dimensionnement multicouche de réseaux statiques composés de deux couches utilisant la commutation en mode circuit (typiquement IP-sur-WDM). Nous proposons un modèle semi-analytique expliquant le comportement des algorithmes responsables de l’agrégation et du routage dans les deux couches. Ce cadre théorique permet de comparer les algorithmes de dimensionnement multicouche entre eux, mais aussi d’expliquer et d’améliorer leur efficience. Nous décrivons ensuite comment la contrainte de portée optique affecte les résultats d’un algorithme de dimensionnement multicouche. Enfin, nous expliquons comment ces résultats s'appliquent au dimensionnement des réseaux de nouvelle génération (dynamiques et hétérogènes en capacité optique

IP/MPLS over OTN over DWDM multilayer networks: optimization models, algorithms, and analyses

Dissertation advisor: Deep MedhiVitaIncludes bibliographical references (p. 151-155)Thesis (Ph.D)--School of Computing and Engineering. University of Missouri--Kansas City, 2011Title from PDF of title page, viewed on May 24, 2011Over the past decade, multilayer network design has received significant attention in the scientific literature. However, the explicit modeling of IP/MPLS over OTN over DWDM in which the OTN layer is specifically considered has not been addressed before. This multilayer network architecture has been identified as promising that bridges integration and interaction between the IP and optical layers. In this dissertation, we consider four related problems. First, we present an integrated capacity network optimization model for the operational planning of such multilayer networks. The model considers the OTN layer as a distinct layer with its unique technological ODU sublayer constraints. Secondly, we present a design model to investigate the correlation effects of the IP and OTN layers when the physical DWDM layer capacity is a given constant. We also develop a heuristic algorithm to solve the models for large networks. We provide comprehensive numeric studies that consider various cost parameter values of each layer in the network and analyze the impact of varying the values on network layers and overall network cost. We have observed the significant impact of the IP/MPLS capacity module on each layer and the entire network. Generally, when this parameter size is above the average demand in the network, it leads to the best overall network design. Thirdly, we consider the problem of optimizing node capacity in this architecture as our design goal, since routers with more capacity and complex structure consume significant power. We present an explicit networking optimization model that aims to minimize the total capacity at the LSRs and the OXCs. Our assessment shows that the different weight ratios of LSR to OXC nodes do not generally affect the overall required capacity of each layer. However, the weight ratios influence differently required node capacity at nodes in each layer. Finally, we factor in the survivability of the multilayer network by considering a suitable protection mechanism for each network layer. We provide a phase-based heuristic approach, study and analysis. We have also examined the network performance from cost vs. protection capacity perspectives while varying the size of the IP/MPLS capacity module.Introduction -- Literature survey -- OTN technology overview -- An integrated capacity optimization model -- A heuristic approach to solve (P1) -- Study and results for (P1) -- IP/MPLS and OTN layer correlation effects -- Study and results for (P2) -- Optimizing node capacity -- Study and results of (P3) -- Multilayer network protection -- Study and results for (P4) -- conclusion and future work -- Appendix A. Sample input/output file