Multicast-sharing and multilayer protection method based on subtrees in WDM (wavelength division multiplexer) optical network,

Abstract

The invention provides a multicast-sharing and multilayer protection method based on subtrees in a WDM (wavelength division multiplexer) optical network, belonging to the technical field of network communications. The method comprises the steps of: establishing a working multicast forest, establishing a protection multicast forest, protecting a WDM layer and leaving services. In the method, under the premise of considering single-link faults, a multicast-sharing protection method is constructed on the basis of the subtrees, a subtree-protecting resource sharing strategy, a light-path resource sharing strategy and a wavelength link protecting resource sharing strategy are adopted according to differences of shared grain sizes, so that the quantity of damaged services when a physical link generates faults is reduced, the application range of the traditional multicast-sharing and multilayer protection method can be expanded, multiple constraining conditions are considered when multilayer protection is carried out, and the multicast-sharing and multilayer protection method is provided under multiple strategies.

Description

technical field [0001] The invention belongs to the field of network technology, and in particular relates to a subtree-based multicast sharing multi-layer protection method in a WDM optical network. Background technique [0002] With the rapid development of the Internet, people put forward new requirements for the capacity and performance of the communication system. A wavelength division multiplexing (Wavelength Division Multiplexing, WDM) technology can provide a huge transmission capacity to meet the bandwidth requirements of Internet services. However, once a network failure occurs, it will cause a large number of business interruptions. At the same time, in order to reduce network operating costs and improve bandwidth resource utilization, the transmission network is gradually developing from the traditional IP over ATM over SDH / SONET over WDM multi-layer structure to the IP over WDM two-layer structure, and IP services are directly carried on WDM on the optical net...

AI Technical Summary

Problems solved by technology

[0003] Most of the traditional multicast shared multi-layer protection methods in optical networks only consider the shared multi-layer protection methods for link failures under single constraints, and their scope of application is narrow, without considering the constraints on the number of optical transceivers, sparse wavelength conversion constraints, etc. In the case of multiple constraints, there is no comprehensive consideration to reduce the number of recovery actions when a failure occurs and to improve the resource utilization of the optical path

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