Hardware Node Structure And Protection Mechanism Based On Software Defined Optical Network

The arrival of the age of big data, which make the optical network face many new challenges. First, optical networks need to improve the dynamic adaptability to meet the increasing high bursty service. Second, optical networks ought to have the flexible extended capacity to accommodate large-scale networking. Third, the ever-changing bandwidth of service requires optical networks have the flex-grid ability to regulate the networks. Meanwhile, the rapid development of the software defined optical network (SDON), which brings new opportunities to meet these challenges. Software defined network (SDN) has strong capacity of programming and extension to control the hardware nodes, while it could compatible with elastic optical network. Hence, optical network combine with SDN so that it may go a long way in solving the above problems.In this paper, optical network is combined with the SDN thought, then the software architecture is constructed on the SDON experimental platform. Because of the different features of optical layer and electrical layer, the OpenFlow protocol is extended from the IP layer to the optical layer based on the nature of light. Through this extension, the platform could utilize the controller to control optical network nodes to meet the special demand of optical network under the SDON architecture. In addition, the hardware nodes and nodes failure of the experimental platform are described in detail. Specific work is as follows:Firstly, the Switch module of software is designed based on the SDON. When the Switch module is deployed on the platform, the API of the underlying hardware nodes are also be developed to realize the control of the underlying physical resources. Moreover, we make the extension of OpenFlow to achieve the goal of applying Switch in optical domain. According to SDON software architecture, the construction of underlying hardware plane and multi-domain networking are accomplished.Secondly, on the basis of the different functions of the hardware nodes in the experimental platform, NOX realizes the programming control of the different kinds of the hardware nodes. Meanwhile, we accomplish self-design BV-OXC optical nodes, which coordinate better with the SDON and support for the elastic control of variable bandwidth.Thirdly, in order to solve the node failure problems under the SDON, we propose a network function virtualization (NFV) scheme based on the traditional optical network devices. The new scheme is different than the traditional hardware node failures in SDON. A new structure of the optical node is designed in the scheme, which realize the NFV and preprocess the data packet in SDON. And.this scheme reduces the limit of hardware devices through upper virtual network. Thus, consumers could use this scheme to decrease the influence of nodes failure and operators’replacement cost of the equipment in SDON.