1 research outputs found
End-to-End Path Computer Schemes for Traffic Engineering in Next Generation Multi-Domain Networks
RĂSUMĂ
Avec la venue des réseaux de prochaine génération basés sur le paradigme tout-IP et la demande croissante en qualité de service (QdS) des nouvelles applications temps réel, il
existe un besoin imminent pour des mécanismes capables de soutenir le trac de bout-en-bout. Les requis de QdS sont souvent décrits par les paramÚtres de bande passante, délai, gigue, perte de paquets et disponibilité. Ainsi, les opérateurs de réseaux ont un besoin imminent de techniques qui leur permettraient de satisfaire les exigences de QdS des nouvelles applications IP.
Le consensus pour subvenir aux exigences de QdS est la pratique de l'ingénierie de trac. L'ingénierie de trac consiste à acheminer le trac de façon optimale en utilisant les ressources disponibles, tout en satisfaisant les contraintes de QdS et celles du réseau. Cela est souvent réalisé en calculant des chemins optimaux par l'ingénierie de trac, qui constitue l'aspect central de cette thÚse.
En effet, les paramĂštres de performances de QdS peuvent ĂȘtre satisfaits en choisissant avec soin un chemin qui a assez de bande passante disponible et qui offre un dĂ©lai et une gigue acceptable. Si la bande passante est rĂ©servĂ©e le long de ce chemin, la congestion peut ĂȘtre Ă©vitĂ©e et la perte de paquets peut ainsi ĂȘtre Ă©liminĂ©e. En outre, le calcul minutieux des chemins principaux et de recours permet une meilleure disponibilitĂ© en cas de panne de lien
ou de noeud.
De plus, Ă©tant donnĂ© que le trac est habituellement transportĂ© Ă travers diffĂ©rents rĂ©seaux administratifs, l'aspect inter-domaine du problĂšme ne peut ĂȘtre nĂ©gligĂ©. Puis, il y a le fait que les rĂ©seaux sont de nature multi-couches. Donc, l'ingĂ©nierie de trac de bout-en-bout ne
peut ĂȘtre atteint que si les aspects inter-domaine et inter-couche sont pris en compte. Ă cette fin, cette thĂšse propose un cadre complet pour l'aspect calcul de chemin bout-en-bout de l'ingĂ©nierie de trac, divisĂ© en trois volets. Ces volets suivent tous la technologie G/MPLS pour
l'acheminement du trac et la réservation de ressources sur les chemins optimaux calculés.---------ABSTRACT
With the advent of all-IP Next Generation Networks and the ever increasing Quality of Service (QoS) demands of new real time IP applications, there is a stringent need for mechanisms that allow the end-to-end sustainment of the
trac. QoS requirements are usually a set of network performance indicators that need to be satised in order for the IP applications to function properly. Common QoS parameters are the bandwidth, delay, jitter, packet loss and
availability. Thus, network operators urgently need to implement solutions enabling them to satisfy the QoS requirements of real time IP applications.
The consensus for QoS provisioning is the application of well dened trac engineering mechanisms, which consists in optimally routing the trac using available resources while
satisfying QoS and network constraints. This is often achieved by trac engineered path computation, which is the central focus of this thesis.
Indeed, the QoS performance parameters can be met by carefully choosing a path that has the available bandwidth, offers the acceptable delay and jitter. If bandwidth is reserved along this path, congestion is avoided and the packet loss performance parameter can also be met. Moreover, careful calculation of primary and backup paths allows high availability in case of node or link failure.
Moreover, there is the fact that trac is usually transported across different administrative networks. Then, there is the detail that networks are multi-layer in nature. Thus, true end-to-end trac engineering can only be achieved if inter-domain and inter-layer aspects are both
considered. To this end, this thesis proposes an overall framework for the end-to-end trac engineered path computation problem. As discussed below, the framework is subdivided into three separate aspects, all relying on G/MPLS forwarding technology, which enables a controlled routing and the reservation of resources along trac engineered paths.
The proposals for each aspect are the outcome of extensive literature review which identify existing solutions, if any, and the reasons of their shortcomings or non-existence. This review limits the direction to be taken to nd a solution, often by using existing standards and
protocols. This is extremely important given the fact that the research topic of this thesis is closely tied to problems of near future generation networks. Thus, it is crucial to reuse existing methods and standards as much as possible in order to get the approval of the research community on the proposed solutions. Moreover, each aspect or sub-problem is carefully studied by dening the actual real world dilemmas surrounding it