What is SD-WAN? How Does SD-WAN Work

SD-WAN

An SD-WAN is a virtual WAN architecture that enables enterprises to securely connect to application applications using any combination of transport services, including MPLS, LTE, and broadband Internet services. SD-WAN uses a centralized control function to route traffic through the WAN. This increases application performance and leads to better user experience, higher business productivity, and lower IT costs.

Traditional WANs based on traditional routers are not cloud compatible. They typically require the return of all traffic, including cloud traffic, from branch offices to a centralized or centralized data center where advanced security inspection services can deploy. The delay caused by the back haul affects the performance of the application, resulting in poor user experience and a loss of productivity. Unlike traditional router-centric WAN architecture, the SD-WAN model supports applications hosted in local data centers, public or private clouds, and SaaS solutions, while providing the highest power.

How does SD-WAN work?

How does an SD-WAN first activate the new cloud model? SD-WAN uses S/W and a centralized control function to route traffic through the WAN. An SD-WAN processes traffic by priority, quality of service, and security requirements according to business needs. The traditional router-centric model distributes control over all devices on the network: routers forward traffic based on TCP / IP addresses and ACLs.

Sending SaaS and IaaS traffic directly over the Internet provides end-users with the best application experience. However, not all traffic associated with the cloud or the web created the same way. Many cloud applications and their vendors use inherently reliable security measures. Accessing these “dependable” applications directly from the store over the Internet provides the security needed to protect the business from threats. Some examples are Salesforce, Office365, ServiceNow, and Dropbox.

However, other applications in the cloud and web traffic may be less reliable, unknown, or even suspicious and require advanced traffic scanning. A sample security policy could be:

  •  Send known and reputable SaaS stores directly over the Internet
  •  Send applications like Facebook, YouTube, and Netflix to a cloud-based security service
  •  Return untrusted, unknown or suspicious traffic, p. Point-to-point applications or traffic from or to another country back to a next-generation firewall at headquarters.

Intelligence and the ability to identify applications provide an application-driven way to route traffic through the WAN instead of merely using the TCP / IP and ACL addresses. This software-based approach offers a much better QoEx than is possible with a WAN model centered on a router.

Actively use all transports, including MPLS, broadband, and LTE

An SD-WAN virtualizes WAN services, such as multi-protocol tag switching (MPLS), broadband Internet services, and 4G / LTE, and treats them as a set of resources.

But why no more Internet connections used for corporate WAN services? Easy. In the past, the Internet was a mixture of networks. It was not safe or reliable enough to meet the needs of the business. And it didn’t work well enough to support commercial applications sensitive to latency or bandwidth.

Overcome broadband challenges.

With the redefinition of the economy of the Internet access network, it is time to take advantage of broadband services in the company’s WAN SD. That is, provided that concerns about performance, reliability, and safety can overcome. Common interests are:

  • How to strengthen a broadband Internet connection to create a secure SD-WAN?
  • How do you deal with the latency and performance limitations of broadband?
  • How do you ensure that the transmission of cat videos does not override the priority of critical applications for the business?
  • And if a company has hundreds or even thousands of offices, how do you simplify configuration, management, and expansion?

The solution is to migrate to a business-centric SD-WAN platform that combines SD-WAN, firewall, segmentation, routing, WAN optimization, and visibility and control capabilities into a single platform.

With advanced software-based security and performance features, businesses can securely, reliably and actively use broadband to transport application traffic, rather than merely using it as an inactive backup. By increasing or even replacing MPLS with broadband, companies can significantly increase WAN bandwidth while reducing the overall cost of the WAN.

By continuously monitoring WAN applications and transport resources, an SD-WAN can quickly adapt to changing network conditions to ensure the highest performance and availability of the application. An enhanced SD-WAN provides the highest level of end-user experience, even if a transport service fails or fails (excessive packet loss, latency, or jitter). It improves the productivity of the company and the satisfaction of the end-users.

Two important SD-WAN features (SD features ):

Centralized orchestration –  

By centralizing the configuration of an SD-WAN and application performance and security policies, organizations can significantly reduce WAN operating costs.

Zero Touch Provisioning (ZTP) –

With ZTP, settings and policies are programmed once and sent to all branches without having to program each device individually via a CLI manually. You do not have to send specialized IT resources to branch offices when you add a new application or change a policy. ZTP also reduces human error, resulting in more consistent policies across the enterprise.

Unlike device-centric and hardware-based WANs that rely on traditional routers, and SD-WAN uses SOFTWARE to more intelligently route traffic through the WAN.

Why SD-WAN?

As applications migrate to the cloud, network experts quickly discover that traditional WANs have never developed for the cloud.

Applications are no longer housed only in enterprise data centers. They are found in:

  • Data centers on site
  • Public or private clouds
  •  SaaS subscription-based solutions (software as a service) such as Salesforce.com, Workday, Office365, Box, and Dropbox

The traditional model of data transfer centered on the router from the branch to the office and via the Internet is no longer meaningful.

The return network increases latency or delays and decreases application performance. This leads to bad user experience and a loss of productivity. Employees often report that their commercial applications run faster at home or on their mobile devices than in the office. Discover more reasons why it is time to go beyond the router.

Geographically dispersed companies are moving faster towards SD WANs, as they help companies be more agile, increase business productivity, and significantly reduce costs.

Benefits of SD-WAN for companies

  •  Increase your business productivity and user satisfaction.
  •  Increase the flexibility and responsiveness of your company.
  •  Improve security and reduce threats.
  •  Simplify the branch’s WAN architecture
  •  Reduce WAN costs by 90 percent

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