一种高可靠性的服务功能链构建策略

Strategy of Constructing Highly Reliable Service Function Chain

针对网络功能虚拟化环境中服务功能链构建的可靠性问题,提出通过虚拟网络功能组合构建高可靠性服务功能链拓扑的策略。首先描述了提高可靠性的方法及可能存在的资源消耗增多问题;其次建立模型提出构建策略,将虚拟网络功能组合形成关键子拓扑,按组合所节省的带宽顺序依次映射关键子拓扑并反馈其资源消耗,以此判断虚拟网络功能之间的可组合性,确定资源消耗最低的组合方式,构建最优的服务功能链拓扑。最后通过仿真实验对比,提出的策略能有效地提高服务功能链的可靠性,并有效降低资源消耗。

A construction strategy based on virtual network function combination is proposed to improve the reliability of service function chain in network function virtualization environment.First,the methods to improve the reliability of service function chain and the possible problem of increasing resource consumption are described in detail;second,the model and the construction strategy are proposed to solve the problem.Virtual network functions are combined to form the critical sub- topologies (CSs) to map according to the descending order of bandwidth saving,and the combination format of the smallest mapping cost is selected to construct the CS topology for a given service function chain in terms of the feedback from mapping.Finally,simulation shows that this strategy can improve the reliability of service function chain and reduce the cost of resources effectively.