A Precomputation Restoration Method Based on Distance Adaptive Routing and Spectrum Allocation

Abstract

The present invention relates to a pre-calculation recovery method based on distance adaptive routing and spectrum allocation. The method separates the network control plane from the data forwarding plane by designing a software-defined elastic optical interconnection data center network architecture, and implements controller function modules and The OpenFlow protocol is extended to realize fast and flexible customization of network functions; the network topology is divided into layers according to the number of spectrum slots on the link, and a spectrum window layered auxiliary graph model is constructed, and an appropriate modulation format is selected through distance self-adaptation. The layer-assisted graph model performs routing and spectrum allocation for services; when recovering faulty services, use pre-computation recovery technology to restore routes for service calculations in advance, and when services fail, use pre-computation recovery solutions to open network resources for interrupted services, Quickly establish recovery routes. The method can satisfy the double constraints of frequency spectrum adjacency and continuity, avoid causing congestion, and at the same time ensure rapid recovery of faulty services and improve the overall performance of the network.

Description

technical field [0001] The invention belongs to the technical field of elastic optical interconnection data center networks, and relates to a pre-computation recovery method based on distance self-adaptive routing and frequency spectrum allocation. Background technique [0002] In recent years, with the emergence of high-bandwidth services such as big data, cloud computing, and high-definition multimedia video, IP services in data center networks have grown by leaps and bounds [Index C V N. Forecast and Methodology, Technical Report, Cisco White Paper [R]. 2015: 2014-2019.]. The exchange of massive information in the data center and the uncertainty of service flow and flow direction urgently require the optical network to be able to carry and transmit data center services flexibly, quickly and reliably. Traditional wavelength division multiplexing (wavelength-division-multiplexing, WDM) optical network has low spectrum utilization due to fixed ITU-T wavelength interval limi...

AI Technical Summary

Problems solved by technology

However, this recovery algorithm does not consider the problem that the calculation time of service rerouting accounts for a large proportion of the entire recovery time

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