Patent ID: 8121039
Filing Date: 2012-02-21
Classification: H04L,H04Q

Abstract:
1. A joint route query method in an automatic switched optical network (ASON), comprising the following steps: (1) after a route controller (RC) in one route domain belonging to a parent domain receives a route query request from a requester, it calls a routing algorithm based on the route query request, calculates a route based on a route database of a current node; if a complete route is obtained, a route query result is returned to the requester, if no complete route can be obtained, the route query request will be forwarded to an RC in the parent domain as a route controller for being responsible for route query and calculation of the parent domain; (2) after receiving the route query request, the RC in the parent domain calculates a local-domain route or interacts with RCs in other domains which are at the same layer with the parent domain and responsible for route query and calculation of the other domains, if a complete route can be obtained through calculation or combination, the route query result will be returned to the requester through the RC that initiates the request, otherwise a failure message will be returned to the requester through the RC that initiates the request; wherein in step (2), the route query in the local domain performed by said RC in each parent domain by interacting with each sub-domain RC; namely, the RC in the parent domain sends the route query request to each sub-domain RC; each sub-domain RC returns the route query result of the local domain to the RC in the parent domain, and the RC in the parent domain obtains the complete route of the parent domain through combination.