Call routing in an atm switching network

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01)

Patent

CA 2231575

A routing scheme for an ATM switching network includes a plurality of switching nodes, each of which includes individual storage for storing routing messages for each outgoing link. A call at a source node is routed through one possible routing path which requires only one or two links to complete a connection to a destination node. In such case, one of the routing paths is selected based on link state information concerning only the possible routing paths. If the call requires a route path which includes three or more links to the destination node, the source node performs a predefined sequential routing to its neighboring node before the neighboring node negotiates with selected intermediate nodes for a connection involving two links. The routing messages stored at each node are processed independently and simultaneously by each node. The main requirement is that routing decisions must be based on true link-state information. A protocol is devised for fast and efficient bulk processing while avoiding potential deadlocks.

Un système d'acheminement pour un réseau commuté MTA comprend une pluralité de noeuds de commutation, chacun comprenant une mémoire individuelle pour conserver les messages d'acheminement pour chaque liaison sortante. Un appel à un noeud source est acheminé par une route d'acheminement possible, nécessitant uniquement une ou deux liaisons pour assurer une connexion avec le noeud de destination. Dans un tel cas, un des trajets d'acheminement est choisi sur la base de l'information sur l'état des liaisons concernant uniquement les trajets d'acheminement possibles. Lorsque l'appel nécessite un trajet d'acheminement qui comprend trois liaisons ou plus jusqu'au noeud de destination, le noeud de source effectue un acheminement séquentiel vers son noeud voisin, avant que le noeud voisin ne négocie avec des noeuds intermédiaires choisis une connexion impliquant deux noeuds. Les messages d'acheminement conservés à chaque noeud sont traités indépendamment et simultanément par chaque noeud. La contrainte principale est que les décisions d'acheminement doivent être basées sur une information réelle concernant l'état des liaisons. Un protocole est prévu pour un traitement en bloc, rapide et efficace, tout en évitant les blocages potentiels.

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