面向多节点故障的生存性虚拟网络映射方法

针对网络虚拟化环境中虚拟网络的生存性问题，提出一种面向多节点故障的生存性虚拟网络映射方法。该方法预先在物理网络中按比例留出备份资源并根据拓扑属性构造节点的候选集合，在发生节点故障后从故障节点的候选集合中选取重映射目标并动态分配预留的备用资源来恢复受到影响的虚拟网络，提高长期运营利润。仿真实验在多节点故障模型下从适用性、稳定性及性能方面验证了该方法的有效性。

Virtual network embedding approach to survive multiple node failures

Considering the survivability of virtual networks in a network virtualization environment, a virtual network embedding approach was proposed to survive multiple node failures. It de backups proportionally in the substrate network and constructed a candidate set for each substrate node beforehand. To increase the long term business profit, it chosen the failover targets in the candidate set and dynamically allocates backups to recover the affected virtual networks after substrate node failures. The validity of this method is assessed by simulation experiments in terms of applicability, stability and performance under a multiple node failures model.