SD WAN (Software Defined Wide Area Network) allows you to connect multiple service providers to multiple interfaces by using an SD WAN capable firewall. The SD WAN firewall is application aware and automatically steers traffic over different providers according to certain conditions.
For example you could connect an MPLS network using one WAN connection and correct online about the second WAN connection. With SD WAN the traffic would then dynamically route over either connection according to policies you define.
Overview
To understand how SD WAN works and exactly how it benefits your company it is important to first understand how things were configured previously.
Consider hot and cold taps with an old-fashioned wash hand basin. Suppose the hot tap (WAN 1 Interface) is attached to the MPLS Network as well as the cold tap (WAN 2 Interface) is connected to the Internet.
If the hot tap and cold taps are operated separately it is difficult to regulate the temperature and flow of the water since they are totally separate from the other person. Similarly, prior to SD WAN it turned out challenging to mix, control and manage traffic (business applications) across separate independent WAN Interfaces (in this example MPLS and Internet) similar to the water in an old wash hand basin.
Why’s SD WAN better?
SD WAN is a bit like a modern wash hand basin with both the new and cold taps combined in an easy to adjust mixer tap. The water temperature could be controlled and may also be automatically regulated to provide you with an ideal hot and cold levels constantly.
With SD WAN you’ll have granular treatments for traffic across all WAN networks with advanced flexibility and agility. By way of example, it is possible to define policies that always send traffic out of your main business application over the MPLS network for instance but automatically transition to the net VPN if the MPLS network is congested or unavailable.
SD WAN transfers the responsibility of traffic management from physical devices to software and enables you to effectively and securely route visitors to remote locations such as branch offices. Centralised control gives full visibility throughout the network and enables simplicity of management.
To conclude SD WAN will provide you with complete control of the way you dynamically route and prioritise traffic according to application type along with other factors like congestion and availability.
Just how can SD WAN benefit your business?
Lower bandwidth costs
Centralised network management
Full network visibility
Increased options for vendor selection and connection type
SD-WAN benefits businesses by removing expensive routing hardware and instead provisioning connectivity and services from the cloud. Using the increased dependency on cloud-based services nowadays in this workplace SD WAN offers a much more robust and reliable network.
SD WAN is often a a lot more flexible option allowing an enterprise to scale connectivity down and up as their business dictates which enable it to automatically adjust and steer cloud-based traffic over different routes when congestion or service provider failure occurs. This gives an enterprise to own a more efficient and cost-effective enterprise reducing bandwidth costs as needed without compromising availability. Organizations are effectively avoiding over provisioning which lowers overall WAN costs.
The centralised control enables changes to get implemented and quickly pushed in the market to network hardware like routers and switches.
After a basic investment SD-WAN can improve a business’s connectivity between branch locations, the principle office, data centres and also the cloud while reducing running costs making long-term savings over time.
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