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中文摘要：
网络功能虚拟化（NFV）将服务功能链（SFC）映射到底层网络时，与传统的虚拟网络一样，会存在可靠性问题。针对NFV环境中的单链路故障，在考虑SFC拓扑设计和映射的基础上添加备份拓扑提高可靠性，再进一步简化备份拓扑，减少资源消耗。按照服务路径是否可分离，提出了两种最优备份拓扑的生成算法。仿真结果表明，最优备份拓扑在提高可靠性的基础上能够有效地减少备份带宽资源的消耗，提高资源利用率。
英文摘要：
Like traditional virtual network, the problem of reliability will exist when the SFC is mapped to the underlying net-work by NFV technology. Based on the SFC topology design and mapping, this paper added a backup topology to improve the survival rate of the single link failure in NFV environment and simplified the backup topology with less resource consumption. Then it put forward two kinds of optimal backup topology generation algorithms in View Of whether the service path could be separated. Simulation experiments show that the optimal backup topology can reduce the cost of backup bandwidth resources effectively and improve the efficiency of resource utilization based on improving the reliability.
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