It is multitenant, cloud-delivered, highly automated, secure, scalable, and application-aware with rich analytics. It fully integrates routing, security, centralized policy, and orchestration into large-scale networks. The Cisco® SD-WAN solution is an enterprise-grade WAN architecture overlay that enables digital and cloud transformation for enterprises. SD-WAN applies these principles of SDN to the WAN. This de-coupling of data plane forwarding and control plane allows you to centralize the intelligence of the network and allows for more network automation, operations simplification, and centralized provisioning, monitoring, and troubleshooting. SDN is a centralized approach to network management which abstracts away the underlying network infrastructure from its applications. SD-WAN is part of a broader technology of software-defined networking (SDN). In recent years, software-defined wide-area networking (SD-WAN) solutions have evolved to address these challenges. Issues with these architectures include insufficient bandwidth along with high bandwidth costs, application downtime, poor SaaS performance, complex operations, complex workflows for cloud connectivity, long deployment times and policy changes, limited application visibility, and difficulty in securing the network. Legacy WAN architectures typically consist of multiple MPLS transports, or an MPLS paired with an Internet or LTE used in an active/backup fashion, most often with Internet or software-as-a-service (SaaS) traffic being backhauled to a central data center or regional hub for Internet access. Legacy WAN architectures are facing major challenges under this evolving landscape. High availability and scale continue to be important. In addition, security needs are increasing and applications are requiring prioritization and optimization, and as this complexity grows, there is a push to reduce costs and operating expenses. There is a greater demand for mobile and Internet-of-Things (IoT) device traffic, SaaS applications, and cloud adoption. The enterprise landscape is continuously evolving.
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