Today, more critical services than ever rely on the communication infrastructure of 5G and beyond, demanding resilient recovery strategies when disasters occur. The inherent uncertainty of disasters makes post-disaster recovery a complex challenge. Today’s solutions focus on external infrastructure, such as alternative power supply or ad-hoc UAVs, to restore communication. However, the programmable nature introduced in 5G also allows us to migrate (relocate) Virtual Network Functions (VNFs) to restore communication more efficiently. In this paper, we develop an experimental framework to evaluate the performance of recovery strategies utilizing VNF migration in an optical network. We demonstrate that selecting the appropriate post-disaster recovery strategy can significantly accelerate the restoration of critical services by several hours in some disaster scenarios. Furthermore, we create ClusPRi, a modification of the virtual resource allocation algorithm ClusPR. ClusPRi prioritizes critical traffic when allocating resources in a post-disaster scenario. We show that adding routing priority to the resource allocation algorithm further accelerates the restoration of critical communication in a disaster scenario.

中文翻译：

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光网络大规模故障后关键服务的 NFV 恢复策略


如今，比以往任何时候都更多的关键服务依赖于 5G 及更高版本的通信基础设施，这要求在灾难发生时制定弹性恢复策略。灾难固有的不确定性使灾后恢复成为一项复杂的挑战。当今的解决方案侧重于外部基础设施，例如备用电源或临时无人机，以恢复通信。然而，5G 中引入的可编程特性也允许我们迁移（重新定位）虚拟网络功能 （VNF） 以更有效地恢复通信。在本文中，我们开发了一个实验框架来评估在光网络中利用 VNF 迁移的恢复策略的性能。我们证明，在某些灾难场景中，选择合适的灾后恢复策略可以显著加快关键服务的恢复速度。此外，我们创建了 ClusPRi，这是虚拟资源分配算法 ClusPR 的修改版。在灾后场景中分配资源时，ClusPRi 会优先考虑关键流量。我们表明，在资源分配算法中添加路由优先级可以进一步加速灾难场景中关键通信的恢复。