Software-defined WAN (SD-WAN) is a specific subsection of the Software-Defined Networking (SDN) technology, applied to WAN networks. These are most often used for interconnecting enterprise networks, regional and global branches and data centers, including private and public clouds.
WAN implementation in the virtual environment is currently being discussed. SD-WAN features can be compared to those of a traditional VPN, but with higher flexibility, shorter deployment time as per customer requirements and easier administration. SD-WAN allows the company to increase data transport bandwidth, improve the flexibility and reduce operating costs of the existing WAN infrastructure. Its main benefits include intelligent WAN optimization based on QoS requirements of specific applications, line quality, availability or throughput levels, similarly to other network types.
This solution diagram depicts a typical SW-WAN application for a service provider. It shows the main SP control center, i.e. Data Center (DC) in this case, and two connected customers (Customer Site 1 and 2). At the Data Center there is the main SD-WAN technology, i.e. SD-WAN controller, the Orchestrator and the Management System. At connection points on the customer’s side there is the so-called uCPE, running an SD-WAN VNF virtual instance. Customer-to-customer interconnection is provided either via Internet, MPLS or VPN. Within SD-WAN network it is also possible to access public clouds with hosted SaaS.
blue, the colour of rivers, represents the flow of data communications - Green, the indicator of starboard on ships will help with navigation and improve the quality of communications