A UNITED ROUTE QUERY METHOD IN THE AUTOMATIC SWITCHED OPTICAL NETWORK

摘要

This invention discloses a joint route query method in an automatic switched optical network (ASON). After the route controller (RC) in each route domain has received a route query request, it calls a routing algorithm based on the request and the route calculation is performed based on the route database of the current node; if the route calculation succeeds, a route query result is returned to the requester, however if no complete route can be obtained, said route query request will be forwarded to the RC in the parent domain. Based on the request, the RC in the parent domain interacts with RCs in other domain of the same layer, as well as the RCs in the sub-domains contained in the parent domain to complete the route query, and calculates to obtain a complete route, then a route query result will be returned to the RC that initiates the request and this RC will return the route query result to the requester. The method of the present invention can perform the route query that can not be done by the ASON network element in the current route domain through the interaction between RCs of route domains of the same layer and of the different layers, with the advantages of succinctness and trustiness.