Satellite networks have long been regarded as a key enabler for ubiquitous Internet access and global data distribution. However, since they are highly dynamic and much more vulnerable to various failures, how to detour traffic around fault satellites and interrupted links becomes an important but challenging issue. Thanks to the emerging software-defined networking, great controllability can be introduced to the satellite networks for agile management and automation. Hence, in this article, we focus on elastic resilience for software-defined satellite networking, and propose a preliminary solution to cope with the related fundamental challenges in guarantees of controller reachability, collections of network status, and failure detection and recovery. We also discuss several key open issues to be urgently addressed, hoping to shed some light on this promising land.

中文翻译：

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软件定义卫星网络的弹性：挑战、解决方案和未解决的问题

长期以来，卫星网络一直被视为无处不在的互联网接入和全球数据分发的关键推动因素。然而，由于它们是高度动态的并且更容易受到各种故障的影响，如何绕过故障卫星和中断链路的流量成为一个重要但具有挑战性的问题。由于新兴的软件定义网络，可以将极大的可控性引入卫星网络，以实现敏捷管理和自动化。因此，在本文中，我们关注软件定义卫星网络的弹性恢复，并提出初步解决方案来应对控制器可达性保证、网络状态收集以及故障检测和恢复等相关基本挑战。我们还讨论了几个亟待解决的关键未决问题，