A Hierarchical Routing Constraint Method for Low Order Services in Automatic Switched Optical Networks

Abstract

The invention relates to a layered routing constraint method for low-order services in an automatic switching optical network. When low-order services are protected and restored, the routing constraints of ASON low-order services are layered and divided into virtual links. Routing constraints and routing constraints of actual optical fiber links; routing constraints of virtual links adopt the existing routing constraint method, and only carry out routing constraints on virtual link resources; routing constraints of actual optical fiber links adopt virtual link SRLG binding mapping method. By layering the routing constraints of ASON low-order services, the present invention can perform routing constraints on virtual links and all actual optical fiber links that the virtual links pass through, thereby effectively avoiding faulty links and link reuse, and improving low-cost The success rate of the protection and restoration function of the second-order business.

Description

technical field [0001] The invention relates to the field of automatic switching optical networks, in particular to a layered routing constraint method for low-order services in automatic switching optical networks. Background technique [0002] The existing ASON (Automatically Switched Optical Network) control plane technology based on SDH (Synchronous Digital Hierarchy) transport network technology only supports intelligent services with a rate level above VC-4. For low-order services at rate levels below -4 (VC-3 / VC-12), the ASON control plane expands the service architecture of low-order services from a single layer to multiple layers, and establishes VC-4 and above on actual optical fiber links For the high-order channel at the rate level, the high-order channel is abstracted into a virtual link, and the virtual link is used as the link resource of the low-order service and route calculation is performed, so that the low-order service is carried on the high-order channe...

AI Technical Summary

Problems solved by technology

[0008] 1. Different virtual links may be carried on the same actual optical fiber link. If only routing constraints are imposed on the virtual link, it is easy to cause the actual optical fiber link to be reused;

[0009] 2. The fault occurs on the actual optical fiber link. If only the virtual link is routed, it cannot effectively avoid the use of the faulty optical fiber link.

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