SDN中面向控制器與交換機可靠通信的資源規(guī)劃
[Abstract]:The software defined network (Software Defined Networking, SDN) is an innovative network form, which has attracted extensive research and attention of the industry, and is regarded as an important technology in the future network. SDN separates the control computing module from the data processing module in the traditional network equipment. The control computing module is centralized on a central controller, and the separation is well supported by OpenFlow protocol. In SDN networks, switches can only work on the stream table items computed by the controller. Therefore, how to ensure the reliability of communication between controllers and switches is a key problem in SDN networks. The reliability of the communication between the controller and the switch mainly depends on two factors, one is the topology of the SDN network, the other is the deployment of the controller. Therefore, in the phase of network design, a reasonable controller deployment scheme can effectively improve the reliability of communication between the controller and the switch when the network topology is given. In order to ensure the reliability of the communication between the controller and the switch, it is usually necessary to backup the controller and the control path in the control network to avoid the failure of the controller or the control path. The failure of physical network is partly caused by the failure of the network component itself, and partly by the disaster of the environment in which the network component is located. When a disaster occurs in the natural environment of the network, it may lead to regional failure in the network. In this case, in addition to the work resources in the network may be affected by regional failures, and the backup resources prepared for these resources may also be affected, these backup resources will become unusable, Unable to perform the function of recovering a fault resource. In conclusion, in order to improve the reliability of the control network in SDN network, reasonable resource planning is needed when deploying the control network. This paper discusses the problem of controller deployment in control network resource planning and the problem of controlling network resource backup. The main research contents are as follows: (1) A controller deployment method based on minimum coverage is proposed. The aim of this method is to deploy several controllers for the SDN network in a reasonable manner during the initial deployment phase of the network, so that the reliability of the control network can be guaranteed, and the transmission delay between the controller and the switch can meet the requirements. Methods firstly, the index to measure the reliability of the control network is defined. Then, the concepts of neighborhood and minimum cover in SDN network are proposed, and the problem of controller deployment is transformed into the problem of solving the minimum coverage of SDN network. Then, according to the idea of binary search, an algorithm is proposed to search the minimum coverage. (2) A resource backup method for fault control network is proposed. In this paper, a model is established to describe and characterize the impact of regional faults on the network. For the backup of the controller, the main controller is considered as the source of the regional fault, and the influence of the other nodes in the network is measured. At the same time, the average transmission distance between each node and the other nodes is considered. Considering the efficiency of backup resource and synthesizing these two factors, a reasonable backup scheme of controller is obtained. For the backup of the control path, a random link in the control path is considered as the source of the regional fault, the survivability of other backup paths is measured, and the path with the highest survivability is selected as the backup path.
【學位授予單位】:北京郵電大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TP393.0
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