Differential forwarding in address-based carrier networks

Details Differential forwarding in address-based carrier networks Differential forwarding in address-based carrier networks

H - Electricity

04

L

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

Patent

CA 2560702

The invention relates to enabling differential forwarding in address-based carrier networks such as Ethernet networks. There is described a method of and connection controller for establishing connections (76, 77) in a frame-based communications network comprising nodes (71-75 and 78) such as Ethernet switches. The connections are established by configuring, in various of the nodes, mappings for forwarding data frames, such as Ethernet frames. The mappings are from a combination of a) a destination (or source) address corresponding to a destination (or source) node (73) of the connection and b) an identifier, such as a VLAN tag. The mappings are to selected output ports of the various nodes. By using the combination of destination (or source) address AND identifier, the mappings enable data frames belonging to different connections (76, 77) to be forwarded differentially (ie forwarded on different output ports) at a node (75) despite the different connections having the same destination node. This enables flexibility in routing connections and the ability to perform traffic engineering.

L'invention permet la retransmission différentielle de réseaux de support basés sur une adresse tels que des réseaux Ethernet. Elle porte sur un procédé et un contrôleur de connexion permettant d'établir des connexions (76, 77) dans un réseau de communication basé sur une trame comprenant des noeuds (71-75 et 78) tels que des commutations Ethernet. Ces connexions sont mises en place par configuration, dans différents noeuds, de mappages en vue de la retransmission des trames de données, telles que des trames Ethernet. Ces mappages sont issus d'une combinaison a) d'une adresse de destination (ou source) correspondant à un noeud de destination (ou source) de la connexion et b) d'un identificateur, telle une étiquette LAN virtuel. Ces mappages sont effectués sur des ports de sortie sélectionnés de différents noeuds. Grâce à l'utilisation de la combinaison d'une adresse et d'un identificateur de destination (ou source), ces mappages permettent de retransmettre de manière différentielle (c'est-à-dire de retransmettre sur différents ports de sortie) des trames de données appartenant à différentes connexions (76, 77), au niveau d'un noeud (75) bien que les différentes connexions aient le même noeud de destination. Les connexions sont ainsi acheminées de manière flexible et il est possible d'effectuer une étude de trafic.

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