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  1. CONTENTS  Introduction  Need  Working  MPLS vs. SD-WAN  Architectures  Benefits  Conclusion  References
  2. Introduction • Traditionally, enterprises utilized dedicated and private, but bandwidth constrained, and expensive MPLS networks for communications between branch offices, to/from headquarter locations, and to access applications and data housed in data centers.
  3. Need of SD-WAN • Enterprises needed a method of allowing each enterprise location to quickly, with business grade performance, and continuous uptime, access 1) every other location in the network; 2) data center-located applications and data; 3) all cloud applications
  4. SD-WAN • SD-WAN is the application of software-based network technologies to WAN connections to more effectively route all network traffic between headquarters or data centers, remote and branch offices, and the cloud. • Unlike previous WAN technologies, SD-WAN is fully controlled by a centralized software application, creating a virtual network on top of the circuits, known as an overlay. • MPLS alone was inadequate from an architecture or bandwidth perspective, especially for cloud and real-time applications.
  5. Working of SD-WAN • An SD-WAN uses software and a centralized control function to more intelligently steer or direct traffic across the WAN. • An SD-WAN handles traffic based on priority, quality of service and security requirements in accordance with business needs. • Sending SaaS and IaaS traffic directly across the internet delivers the best application Quality of Experience for end users. • Accessing these “trusted” applications directly from the branch, across the internet provides the needed security to protect the enterprise from threats.
  6. SDWAN Architecture
  7. continue… Two key SD-WAN capabilities  Centralized Orchestration  Zero-Touch Provisioning (ZTP)
  8. MPLS • MPLS is a protocol for efficient network traffic flow between multiple locations. • It is a routing technique in telecommunications networks that directs data from one node to the next based on short path labels rather than long network addresses, thus avoiding complex lookups in a routing table and speeding traffic flows. • Cons: • There is a big limitation on how long it takes to deploy • High bandwidth cost that MPLS demands can be out of reach • Built-in data protection is not offered
  9. MPLS vs. SD-WAN • Packet loss issues • Enhanced performance • Reliability • Embedded security
  10. SD-WAN architectures 1. On-premises-only • Your company has an SD-WAN box (essentially a plug ‘n play router), performing real-time traffic shaping at each site. only connects to your company’s other sites • A common configuration is keeping a (much smaller), MPLS network for real-time apps, and utilizing the public Internet (controlled by the SD-WAN).
  11. SD-WAN architectures 2. Cloud-enabled • In a cloud-enabled SD-WAN architecture, the solution offers an onsite SD-WAN box connecting to a cloud (virtual) gateway. • A common configuration is to have in-house real-time apps running on a small MPLS network and have cloud apps (and everything else), running over the public Internet, controlled by an SD-WAN. • Best Fit : Companies running big-name cloud applications, such as Office 365, AWS, Drop Box, Azure, Salesforce, etc.
  12. SD-WAN architectures 3. Cloud-enabled plus backbone • “Cloud-enabled plus backbone” SD-WAN architecture offers an on-site SD-WAN box connecting your site to the SD-WAN provider’s nearest network point of presence (POP), where your traffic hops on the SD- WAN provider’s private, fiber optic, network backbone. • Best Fit - A company running a lot of real-time network applications, wanting to completely scrap their MPLS network.
  13. Why are companies switchingto SD-WAN? • Security • Centralized Orchestration • Network Visibility • Provider Reliability • Performance • Connection • Scalability • Flexibility
  14. Is it business proven? • SD-WAN has been commercially available for almost 5 years from the market founders, and now market leaders • It’s a huge growth industry (IDC predicts 40.4% compound annual growth rate from 2017 to 2022 to reach $4.5 billion) so there are lots of new vendors keen to get a share of the market. • To date we have seen more than 60 “SD-WAN vendors” enter the market.
  15. Some proofs • Speed to market - proof of concepts to date, time to market with SD-WAN deployment is just one week (or less in many cases). • 29% of enterprises have deployed. • 30% more considering deployment. • 53% anticipate increased investment in network security through SD-WAN.
  16. Conclusion • The superior functionality of SD-WAN means it has the capacity to galvanise the weakest link of the network, ensuring that it will always be strong enough to keep business data flowing, without interruption and at a much lower cost. • The days of manually architecting a new link are over. With SD-WAN there will always be another galvanised link ready and waiting to take over. • For businesses with a large number of branch offices in particular, this is easily the future of networking technology – and it won’t be long before it goes mainstream.
  17.  SDN in Wide-Area Networks: A Survey  SD-WAN working : networks/sd-wan/what-is-sd-wan.html  Architecture of SD-WAN : architecture.html