Reoptimization triggering by path computation elements

H - Electricity – 04 – J

Patent

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H04J 1/16 (2006.01)

Patent

CA 2565282

A mechanism to alleviate bandwidth fragmentation in a network employing path computation element(s) to place MPLS Traffic Engineering tunnels. One application is a multiple Autonomous System or multiple area network employing distributed computation of MPLS Traffic Engineering LSPs. A particular path computation element may determine that bandwidth fragmentation is present based on monitoring of path computation failures where desired paths are blocked due to bandwidth constraints. In response to the detected bandwidth fragmentation condition, the path computation element floods a routing notification within its Autonomous System or area. Nodes respond to the routing notification by requesting reoptimization of their own previously requested Traffic Engineering LSPs allowing the path computation element an opportunity to alleviate bandwidth fragmentation.

Mécanisme servant à soulager la fragmentation de largeur de bande dans un réseau mettant en application un ou plusieurs éléments de calcul de trajectoire afin de mettre en place des tunnels d'ingénierie de trafic MPLS. Une application consiste en un système autonome multiple ou en un réseau comportant des zones multiples et mettant en application un calcul distribué de LSP d'ingénierie de trafic MPLS. Un élément de calcul de trajectoire défini peut déterminer que la fragmentation de largeur de bande est présente sur la base du contrôle de défauts de calcul de trajectoire au niveau de blocages des trajectoires désirés à cause de contraintes de largeur de bande. En réponse à la détection de l'état de fragmentation de largeur de bande, l'élément de calcul de trajectoire noie une notification d'acheminement dans son système ou sa zone autonome. Certains noeuds répondent à cette notification d'acheminement par demande de réoptimisation de leur propre LSP d'ingénierie de trafic demandé précédemment, afin de donner l'opportunité à l'élément de calcul de trajectoire de soulager la fragmentation de largeur de bande.

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