基于NOX平台的光网络控制器关键问题的研究

发布时间：2018-04-22 03:20

本文选题：光网络 + 软件定义网络　；参考：《电子科技大学》2015年硕士论文

【摘要】：随着光网络技术的快速发展,光网络经历了从SDH(Synchronous Digital Hierarchy)到WDM(Wavelength Division Multiplexing),再到OTN(Optical Transport Network)技术的变化过程。尽管传统的光网络技术发展较快且传输速度也大幅度提高,但它的不足之处仍逐渐凸现了出来。传统的光网络采用封闭式的控制平面对网络进行分布式控制,它的控制接口封闭且没有标准化,使得网络管理策略不能被定制化,也不能实时地、动态地改变光网络的逻辑拓扑结构,以适应不断变化的新业务需求。近年来,SDN(Software Defined Network)技术被认为能很好的解决传统光网络的缺陷问题。SDN将网络的控制面从网络设备中分离出来,将其运用于逻辑上集中的控制器上,并为应用提供标准化的北向接口和通过标准化协议控制下层设备。这样,SDN使得光网络的控制变得更加灵活。控制器是SDN光网络的大脑,控制和管理整个网络。因此,本文的主要研究目标是基于NOX光网络控制器的光网络控制平面的关键技术。首先,论文第二章以NOX为平台,OpenFlow为核心协议,对光网络控制器进行详细地设计,然后设计和实现了基于NOX平台的光网络控制器与用户应用程序、网络应用程序、光交换设备之间的接口协议。论文第三章通过FlowVisor平台来实现光网络虚拟化的设计,将光网络设备端口划分为多个虚拟端口,每个虚拟端口占用一定的波长资源。这样的结果使得虚拟光网络的划分精确到了每个端口的每个波长。其次,论文第四章研究了静态虚拟光网络规划问题。与传统光网络规划问题不同,为了降低虚拟网络的管理复杂度,虚拟光网络规划问题需要尽量减少虚拟节点的数目。论文首先将静态虚拟光网络规划问题描述为一个混合整数规划问题,然后,为了能在大规模网络中有效的求解该问题,论文还提出了一种高效的启发式算法,最后通过仿真验证了算法的有效性。最后,论文第五章研究了动态虚拟光网络规划问题。在动态虚拟光网络规划问题中,业务矩阵不再是一个确定的值,而是一组对应于多个时段的业务量矩阵集合。动态虚拟光网络规划的目标是为多个时段的业务量矩阵规划出一个统一的虚拟网络映射方案。为了解决该问题,论文设计了三种具有不同性能和复杂度的启发式算法,并仿真比较了三种算法的性能。
[Abstract]:With the rapid development of optical network technology, optical network has experienced the process from SDH(Synchronous Digital hierarchy to WDM(Wavelength Division Multiplexing, and then to OTN(Optical Transport Network. Although the traditional optical network technology is developing rapidly and the transmission speed is greatly improved, its shortcomings have been gradually highlighted. The traditional optical network uses closed control plane to control the network distributed, its control interface is closed and has no standardization, so the network management strategy can not be customized, nor can it be real-time. The logical topology of optical network is changed dynamically to adapt to the new business requirements. In recent years, SDN Software Defined Network (SDN) technology has been considered to be a good solution to the defects of traditional optical networks. SDN separates the control surfaces of networks from network devices and applies them to logically centralized controllers. And provide standardized north interface for application and control lower equipment through standardization protocol. In this way, SDN makes the control of optical network more flexible. The controller is the brain of the SDN optical network, which controls and manages the entire network. Therefore, the main research goal of this paper is the key technology of optical network control plane based on NOX optical network controller. Firstly, in the second chapter, we design the optical network controller based on NOX platform, and then design and implement the optical network controller based on NOX platform and user application program, network application program. Interface protocol between optical switching devices. In the third chapter, the design of optical network virtualization is realized through FlowVisor platform. The optical network device port is divided into several virtual ports, and each virtual port occupies a certain wavelength resource. This results in the division of virtual optical networks to each wavelength of each port. Secondly, in the fourth chapter, the static virtual optical network planning problem is studied. Different from the traditional optical network planning problem, in order to reduce the management complexity of the virtual network, the virtual optical network planning problem needs to reduce the number of virtual nodes as far as possible. In this paper, the static virtual optical network planning problem is first described as a mixed integer programming problem. Then, in order to solve the problem effectively in large-scale networks, an efficient heuristic algorithm is proposed. Finally, the effectiveness of the algorithm is verified by simulation. Finally, in chapter 5, the dynamic virtual optical network planning problem is studied. In the dynamic virtual optical network planning problem, the traffic matrix is no longer a definite value, but a set of traffic matrices corresponding to multiple periods of time. The goal of dynamic virtual optical network planning is to plan a unified virtual network mapping scheme for multiple time periods of traffic matrix. In order to solve this problem, three heuristic algorithms with different performance and complexity are designed, and the performance of the three algorithms is simulated and compared.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.1

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