基于SDN负载均衡技术的研究与实现
发布时间：2019-06-27 13:08
【摘要】：随着互联网的迅速发展,网络流量日益增大,数据中心面临的流量压力也不断增加。由于传统网络架构无法对网络设备进行全局性管控,因此容易造成节点负载不均,导致网络服务质量下降。软件定义网络(SDN, Software Defined Network)将传统网络设备的转发层与控制层分离,利用控制层实现对网络的集中式管理。SDN架构为数据中心的负载均衡提供了良好的思路。针对数据中心内网络节点负载不均的问题,有人提出通过单链路指标评价路径进行流量的均衡,为了更好的评价路径,本文综合评价了路径的多个指标,提出了基于链路多指标的最小花费负载均衡(LCLB,Least Cost Load Balancing)算法,降低了链路中负载的抖动率,达到了负载均衡效果。本文设计与实现了控制器中的链路发现模块、拓扑管理模块、拓扑计算模块、信息统计模块、负载均衡模块及流表下发模块,并在此基础上研究和设计了基于SDN的LCLB算法策略。通过拓扑计算模块求得主机间的所有路径,利用统计模块对链路状态进行实时监控,在负载均衡模块中综合考量整个路径中的链路指标值并根据链路状态获取最小花费值的路径,避免路径因单个链路产生的拥塞情况。通过多次实验表明,本文的算法降低了链路负载抖动率和丢包率,能够有效缓解网络拥塞,具有良好的负载均衡效果。
[Abstract]:With the rapid development of the Internet, the network traffic is increasing day by day, and the traffic pressure faced by the data center is also increasing. Because the traditional network architecture can not control the network equipment globally, it is easy to cause uneven load of nodes and lead to the decline of network quality of service. The software defines the network (SDN, Software Defined Network) to separate the forwarding layer from the control layer of the traditional network equipment, and uses the control layer to realize the centralized management of the network. SDN architecture provides a good idea for the load balancing of the data center. To solve the problem of uneven load of network nodes in data center, some people propose to evaluate the traffic balance by single link index. In order to better evaluate the path, this paper comprehensively evaluates several indexes of the path, and proposes a minimum cost load balancing (LCLB,Least Cost Load Balancing) algorithm based on link multi-index, which reduces the buffeting rate of load in the link and achieves the load balancing effect. In this paper, the link discovery module, topology management module, topology calculation module, information statistics module, load balancing module and flow table sending module in the controller are designed and implemented, and the LCLB algorithm strategy based on SDN is studied and designed. Through the topology calculation module, all the paths between hosts are obtained, and the link state is monitored in real time by using statistical module. The link index value in the whole path is comprehensively considered in the load balancing module and the path with the minimum cost value is obtained according to the link state, so as to avoid the congestion caused by a single link. Many experiments show that the proposed algorithm reduces the link load buffeting rate and packet loss rate, can effectively alleviate the network congestion, and has a good load balancing effect.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0
[Abstract]:With the rapid development of the Internet, the network traffic is increasing day by day, and the traffic pressure faced by the data center is also increasing. Because the traditional network architecture can not control the network equipment globally, it is easy to cause uneven load of nodes and lead to the decline of network quality of service. The software defines the network (SDN, Software Defined Network) to separate the forwarding layer from the control layer of the traditional network equipment, and uses the control layer to realize the centralized management of the network. SDN architecture provides a good idea for the load balancing of the data center. To solve the problem of uneven load of network nodes in data center, some people propose to evaluate the traffic balance by single link index. In order to better evaluate the path, this paper comprehensively evaluates several indexes of the path, and proposes a minimum cost load balancing (LCLB,Least Cost Load Balancing) algorithm based on link multi-index, which reduces the buffeting rate of load in the link and achieves the load balancing effect. In this paper, the link discovery module, topology management module, topology calculation module, information statistics module, load balancing module and flow table sending module in the controller are designed and implemented, and the LCLB algorithm strategy based on SDN is studied and designed. Through the topology calculation module, all the paths between hosts are obtained, and the link state is monitored in real time by using statistical module. The link index value in the whole path is comprehensively considered in the load balancing module and the path with the minimum cost value is obtained according to the link state, so as to avoid the congestion caused by a single link. Many experiments show that the proposed algorithm reduces the link load buffeting rate and packet loss rate, can effectively alleviate the network congestion, and has a good load balancing effect.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0
【参考文献】
相关期刊论文 前3条
1 黄正兴;苏e，
本文编号：2506816
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