一种可扩展的SDN多控制器架构

发布时间：2018-12-11 18:36

【摘要】：软件定义网络是当前网络发展的最新趋势,它分离了控制平面和转发平面,并支持用户在控制平面上进行软件编写来定义网络的处理过程。与传统网络相比,软件定义网络要更加灵活和智能。由于采用中心化控制器的原因,网络的处理能力、传输延迟都影响了软件定义网络的扩展,一般可以采用多控制器架构来缓解这些问题。本文研究的是在软件定义网络中,多个控制器的相互协作,共同构成一个可扩展的控制平面的方法。本文首先回顾了现有多控制器方案的优势和劣势,并在这些方案的基础上提出一个新的多控制器架构,通过采用1)层次化的网络架构;2)抽象的网络视图;3)带内通信信道的方式构建网络。首先为不同网络拓扑下的控制器分配不同的网络角色,然后在不同的角色之间构建带内通信信道。通过拓扑发现机制获取网络邻接关系,经过汇总、计算、同步网络视图之后,采用相同的方式构建上层网络视图。并在此架构基础之上设计了路由算法。本文中的多控制器架构主要集中于提升网络的可扩展性,在不修改现有硬件架构和协议的前提下,我们实现了抽象的层次性多控制器架构。实验表明,在网络扩张到一定规模的情况下,本方法具有更小的开销和更快的处理速度。且网络规模越大,效果越显著。
[Abstract]:The software defined network is the latest trend of the network development. It separates the control plane from the forwarding plane and supports the user to write software on the control plane to define the processing process of the network. Compared with the traditional network, the software defines the network to be more flexible and intelligent. Because of the use of centralized controller, the network processing capacity and transmission delay affect the software definition of network expansion, so the multi-controller architecture can be used to alleviate these problems. In this paper, we study the method of constructing an extensible control plane by the cooperation of multiple controllers in a software defined network. This paper first reviews the advantages and disadvantages of the existing multi-controller schemes, and proposes a new multi-controller architecture based on these schemes, which adopts 1) hierarchical network architecture, 2) abstract network view, and 2) abstract network view. 3) constructing the network by means of in-band communication channel. Firstly, different network roles are assigned to controllers under different network topologies, and then intra-band communication channels are constructed between different roles. Network adjacency is obtained by topology discovery mechanism. After summarizing, computing and synchronizing network views, the upper network view is constructed in the same way. The routing algorithm is designed on the basis of this architecture. In this paper, the multi-controller architecture is mainly focused on improving the scalability of the network. Without modifying the existing hardware architecture and protocols, we implement an abstract hierarchical multi-controller architecture. Experiments show that the proposed method has less overhead and faster processing speed when the network expands to a certain scale. And the larger the scale of the network, the more significant the effect.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.02

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