Method and apparatus for providing guaranteed quality of...

H - Electricity – 04 – L

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H04L 12/56 (2006.01) H04Q 3/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2328458

A method and apparatus for adapting existing packet-switched LAN infrastructures (e.g. packet-switched Ethernet) so as to be able to provide reserved-bandwidth virtual-circuit switching services in addition to their conventional capabilities. A centralized control point is incorporated within the infrastructure, preferably via a firmware upgrade to an existing enterprise-class switch, that maintains a map of paths between endstations in the network, as well as the bandwidth capabilities of all links and switches along the paths. When a virtual circuit connection between endstations is requested, the centralized control point determines whether the requested bandwidth is available all along the path. If so, the resources along the path are reserved for the connection. Existing switches in the LAN infrastructure are adapted to give priority to packets belonging to the connection, thereby providing the desired QoS for that connection.

L'invention concerne un procédé et un appareil permettant d'adapter des infrastructures actuelles de réseau local à commutation de paquets (p. ex. Ethernet à commutation de paquets) de manière à pouvoir offrir des services de commutation de circuit virtuel à largeur de bande réservée en sus des fonctions habituelles. Un point de contrôle centralisé est incorporé dans l'infrastructure, de préférence via une mise à niveau matérielle d'un commutateur existant de type entreprise qui conserve une carte de trajets entre les stations terminales dans le réseau, ainsi que les fonctions de largeur de bande de toutes les liaisons et commutations le long des trajets. Lorsqu'une connexion de circuit virtuel entre des stations terminales est requise, le point de contrôle centralisé détermine si la largeur de bande nécessaire est disponible le long du trajet. Le cas échéant, les ressources le long du trajet sont réservées à la connexion. Les commutations existant déjà dans l'infrastructure de réseau local sont adaptées pour donner la priorité aux paquets appartenant à la connexion, assurant ainsi la qualité de service souhaitée pour cette connexion.

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