论文标题
复杂服务功能链（SFC）的简单可靠性分析
A Simple Reliability Analysis of Complex Service Function Chains (SFCs)
论文作者
论文摘要
在网络函数虚拟化（NFV）的框架中，服务功能链（SFC）的可靠性 - 端到端服务由虚拟网络函数链（VNFS）呈现，是放置，配置和部署需求的复杂函数，无论是硬件和软件而言。以前的可靠性分析模型不能直接应用于SFC，因为它们不考虑系统组件共享的各个方面，系统组件的异质性及其相互依存的情况，以防发生故障。在本文中，我们分析了复杂的SFC配置的服务可靠性，包括串行和并行VNF链接及其相关的备份保护组件。我们的分析基于组合分析和减少的二项式定理，并且可以利用这种简单的方法来分析相当复杂的SFC配置。我们首次考虑放置在数据中心，机架和服务器中的VNF组件之间的故障依赖。我们表明，我们的分析可以在任意配置中轻松考虑数据中心网络中不同的VNF放置策略，因此可以有效地用于优化可靠的SFC放置。
In the framework of Network Function Virtualization (NFV), the reliability of Service Function Chain (SFC), -- an end-to-end service is presented by a chain of virtual network functions (VNFs), is a complex function of placement, configuration and deployment requirements, both in hardware and software. Previous reliability analysis models cannot be directly applied to SFC because they do not consider aspects of system component sharing, heterogeneity of system components and their interdependency in case of failures. In this paper, we analyze service reliability of complex SFC configurations, including serial and parallel VNF chaining, as well as their related backup protection components. Our analysis is based on combinatorial analysis and a reduced binomial theorem, and this simple approach can be utilized to analyzing rather complex SFC configurations. We consider, for the first time, failure dependences among VNF components placed in data centers, racks, and servers. We show that our analysis can easily consider different VNF placement strategies in data center networks in arbitrary configurations and, thus, be effectively used for optimizations of the reliable SFC placement.
