GESTION AUTONOME DE LA QUALITE DE SERVICE DANS LES RESEAUX VIRTUELS

Résumé

For several years, the internet has offered many increasingly useful services to the users, with high added value for businesses. But, with the ever-changing needs of users, the basic internet infrastructure no longer satisfied them adequately. Network virtualization has been proposed and adopted as a very promising solution to meet these needs. Dealing with the traffic management challenges in virtual network infrastructures (VNI) in line with the available resources, this thesis proposes the flow splitting approach whose main idea is to split an original flow into several flowlets (sub-streams) in order to facilitate routing. In the first contribution of this thesis, flow splitting is applied to a virtual link failure recovery scenario, by modeling a resource-saving multi-path rerouting scheme based on a SDN (Software Defined Networking) controller. The second contribution solves the persistent links and nodes failures challenge, by defining routing tables’ updates methods for network nodes from a controller. While the user activity causes some traffic variations in the network and often leads to service congestion within the servers, two main server replacement strategies towards the nodes offering enough resources to satisfy QoS, are proposed : "FSBDReViSeR bandwidth" and "FSB-DReViSeR throughput". The simulations carried out reveal that the proposed flow splitting-based traffic management policies, help to reduce the data loss rate, the packet transit delays and the jitter which are key QoS appreciation metrics in computers networks.

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