Abstract
In practical application scenarios, the division of different operators or the same operator in different regions constitutes a natural network region, forming a multi-domain optical network. At the beginning, this paper introduces the hierarchical architecture of software-defined optical network (SDON) and the functional model of control plane. Then, it describes a control system of software-defined multi-domain optical network based on hierarchical control mode and briefly analyzes their basic functional model. In the end, around the problems of resource allocation between scenarios in multi-domain optical network, this paper respectively analyzes the optimization of routing resources in inter-domain and the mechanism of spectrum defragmentation. At the same time, it separately simulates the resource optimization algorithms of single control architecture and hierarchical control architecture to verify the superiority of hierarchical control system.
Highlights
With the increasing demand for communication capacity, the transmission speed, communication quality, and optical network have been developed rapidly in recent years [1,2,3]
Optical transport went through the developments from synchronous digital hierarchy (SDH) to wavelength-division multiplexing (WDM) [4] and optical orthogonal frequency division multiplexing (O-OFDM) [5]
Optical networking construct technology went through the evolvements from point to point network, static wavelength routing network, Automatic Switching Optical Network (ASON) and optical network based on path computation element (PCE) [6,7,8]
Summary
With the increasing demand for communication capacity, the transmission speed, communication quality, and optical network have been developed rapidly in recent years [1,2,3]. We urgently hope that a control mechanism based on these single-domain controllers can realize the control of cross-domain service and optimization of multidomain global network resources [15, 16]. The SDON controller plane supports the connection control, network virtualization, centralization and the ability to provide third party applications in multi-domain, multi-technology, multi-level, and multi-vendor transport network. The multi-domain controller manages the abstraction information of the whole network, and it can centralize control cross domain service and global resource optimization procedure. The system composed of four layers, the transmission equipment of the data plane, the single domain SDON controller in every network, multidomain controller, and application layer. The single domain controllers transfer the topology and network resources and those are abstracted to the multi-domain SDON controller through the interlayer interface I-CPI. The multi-domain controller is only responsible for integrating the operation results of single domain controller
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