Patent ID: 8139938
Filing Date: 2012-03-20
Classification: H04L,H04Q

Abstract:
1. A hierarchical route inquiry method in Automatic Switched Optical Network (ASON) used in a network comprising multi-layer route domains, comprising the following steps: (a1) A Route Controller (RC) of an ASON network element (NE) detects a Route Request launched by a requester, and then forwards the Route Request to a RC of a parent domain if the Route Request is a cross-domain Route Request; (a2) The RC of the parent domain calculates a route among all its child domains and sends an in-domain Route Request to the RC of each child domain on the route, the RC of each child domain calculates the route in its domain and returns a Route Response to the RC of the parent domain, after receiving the Route Response, the RC of the parent domain returns the route to the requester through the RC which launches the Route Request if the complete route can be obtained, otherwise a failure message is returned.