Method and apparatus for priority-based load balancing for...

Details Method and apparatus for priority-based load balancing for... Method and apparatus for priority-based load balancing for...

H - Electricity

04

L

H04L 12/28 (2006.01) H04L 12/46 (2006.01)

Patent

CA 2439865

Bridges (10, 12, 14) are used to interconnect local area networks transparently. In the IEEE 802.1D standard for bridges, a spanning tree is built among the bridges for loop-free frame forwarding. A novel bridge protocol is employed that attempts to find and forward frames over alternate paths that are shorter than their corresponding tree paths on the standard spanning tree for default forwarding. The protocol, referred to as the Spanning Tree Alternate Routing (STAR) Bridge Protocol, is backward compatible with the IEEE 802.1D standard and has a complexity that is comparable to that of the standard and other existing protocols and further includes an ability to prioritize the forwarding of frames over at least two different paths responsive to a priority value carried by a frame to be forwarded.

Selon cette invention, des ponts (10, 12, 14) sont utilisés pour interconnecter des réseaux locaux de manière transparente. Selon la norme IEEE 802.1D relative aux ponts, un arbre maximal est mis en place parmi les ponts pour la transmission de trames sans boucle. On utilise un nouveau protocole de pont qui cherche à trouver et à acheminer des trames par des voies détournées qui sont plus courtes que leurs voies correspondantes sur l'arbre maximal standard pour la transmission par défaut. Ce protocole, appelé Protocole de pont pour acheminement détourné avec arbre maximal (STAR), est rétrocompatible avec la norme IEEE 802.1D et présente une complexité comparable à celle des protocoles standards et autres protocoles existants et présente en outre une aptitude à accorder la priorité à l'acheminement de trames sur au moins deux voies différentes selon une valeur de priorité attribuée à une trame à acheminer.

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