Abstract

International audience; In Multi-Protocol Label Switching-Traffic Engineering (MPLS-TE) networks with distributed tunnel path computation on head-end routers, tunnel requests are handled one by one, in an uncoordinated manner without any knowledge of future and other requests. The order in which requests are handled has a significant impact on the network optimization and blocking probability. If it is not possible to control the arrival order, in return it is possible, in some cases, to reorder requests using the preemption function. This paper evaluates the impact of the arrival order, so as to determine efficient orders. It then proposes two preemption strategies so as to reorder arrivals and evaluate these strategies applied to the shortest constrained path computation algorithm.

Abstract

International audience; This paper deals with Multi-Protocol Label Switching-Traffic Engineering Routing (MPLS-TE Routing) Systems which offer key Traffic Engineering features, such as optimization of resources utilization, Quality-of-Service (QoS) and Fast Recovery. Numerous MPLS-TE Routing systems have been defined in the past with their own advantages and drawbacks. This paper proposes a generic architecture for MPLS-TE Routing Systems, with the main objective of helping in classification, analysis and improvement of these systems or the design of new systems. This architecture includes main functions that may be required in an MPLS-TE Routing System. These functions and their interactions are described. Various approaches and options for the implementation and the distribution of these functions in network elements are qualitatively analyzed. A classification of some well known MPLS-TE routing systems is finally proposed.

Abstract

International audience; This paper deals with Multi-Protocol Label Switching-Traffic Engineering (MPLS-TE) routing systems which offer key traffic engineering features, including optimization of resources utilization, Quality-of-Service (QoS) and fast recovery. Numerous MPLS-TE routing systems have been defined in the past with their own advantages and drawbacks. This paper proposes a generic architecture for MPLS-TE routing system, with the main objective of helping in classification, analysis and improvement of these systems or the design of new systems. This architecture includes main functions that can be required in an MPLS-TE routing system. These functions and their interactions are described. Various approaches and options for the implementation and the distribution of these functions in network elements are qualitatively discussed.