System, device, and method for limiting tunnel traffic in an...

H - Electricity – 04 – L

Patent

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Details

H04L 12/00 (2006.01) H04L 12/46 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2429634

There is disclosed an apparatus and method for limiting tunnel traffic in a network. Traffic engineering tunnels are used to direct traffic along a predefined path, which may differ from the path that internet protocol (IP) routing would determine. Interior gateway rotocol ((IGP) cut through will allow the forwarding of all destinations downstream of a tunnel through the tunnel, without the operator needing to specify a forwarding equivalence class (FEC). But congestion in the tunnel and network instability may result from this approach. A solution to these problems is disclosed which limits the traffic in the tunnel to only that with destination addresses of the tunnel's egress router or nodes directly supported thereby. Other solutions are disclosed which allow tunnel traffic to nodes having destination addresses other than those being directly supported by the tunnel's egress router. All of these solutions are achieved in both pre-determined forwarding entry and dynamic packet-by packet embodiments.

L'invention porte sur un appareil et un procédé visant à limiter le trafic dans les tunnels d'un réseau. Des tunnels d'ingénierie du trafic sont utilisés pour diriger le trafic le long d'une voie prédéfinie pouvant différer de la voie que pourrait déterminer l'acheminement du protocole Internet (IP). Un raccourci intérieur du protocole passerelle permettra l'acheminement de toutes les destinations aval d'un tunnel par le tunnel sans que l'opérateur ait besoin de spécifier une classe d'équivalence d'acheminement. Néanmoins, cette approche peut être à l'origine d'une instabilité du réseau et d'un encombrement du tunnel. A cet effet, on limite le trafic dans le tunnel uniquement à celui mettant en oeuvre des adresses de destination du routeur ou des noeuds de sortie directement supportés par ce tunnel. Une autre solution est de permettre un trafic dans le tunnel aboutissant à des noeuds dont les adresses de destination sont distinctes de celles admises directement par le routeur de sortie du tunnel. Des réalisations dynamiques paquets par paquets et l'entrée de l'acheminement prédéterminée permettent de parvenir à toutes ces solutions.

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