Demands for wide-area connectivity between enterprise site-edge networks and central office core networks/cloud data centers have grown rapidly. Various software defined wide area network (SD-WAN) solutions have been developed with the primary aim of improving WAN link utilization. However, mechanisms used by existing SD-WAN solutions fail to provide high reliability and performance required by today’s edge to cloud applications. In this article, we present WAN-aware MPTCP which seamlessly aggregates multiple WAN links into a “big pipe” for better WAN resilience thus minimizing application performance degradation under WAN link failures. We leverage the congestion control of MPTCP to balance traffic across multiple WAN links. The key innovation is to combine LAN virtualization at end systems with WAN virtualization at SD-WAN gateways. Through evaluation in both emulated testbeds and real-world deployment, we demonstrate the performance gain of WAN-aware MPTCP in terms of resilience and throughput over existing SD-WAN solutions.

中文翻译：

---

改善SD-WAN弹性：从垂直切换到支持WAN的MPTCP

企业站点边缘网络与中央办公室核心网络/云数据中心之间的广域连接需求迅速增长。已经开发了各种软件定义的广域网（SD-WAN）解决方案，其主要目的是提高WAN链路的利用率。但是，现有SD-WAN解决方案使用的机制无法提供当今边缘到云应用程序所需的高可靠性和性能。在本文中，我们介绍了可感知WAN的MPTCP，它将无缝地将多个WAN链路聚合到一个“大管道”中，以提高WAN的弹性，从而最大程度地减少WAN链路故障时应用程序的性能下降。我们利用MPTCP的拥塞控制来平衡多个WAN链接之间的流量。关键的创新是将终端系统上的LAN虚拟化与SD-WAN网关上的WAN虚拟化相结合。