What is SD-WAN?

Meet the technology that’s going to take the headache out of wide area network management

As businesses become ever more reliant on the internet and cloud-based services, it's imperative that a companies' network of connections, from private 4G connections to the main fixed fibre line that feeds into the company's HQ, all operate smoothly, without interruption or bottlenecks. Failure to maintain the smooth running of a network can result in an operational slowdown and, worst still, revenue loss.

That's why businesses have turned to software-defined wide area network (SD-WAN). This allows enterprises to manage their networks in a virtualised environment, which can streamline the routing of internet traffic around the business and predict bottlenecks before they interrupt the transmission of data.

Traditional WAN technology has focussed on connecting physical things at different locations such as company branches, data centres and HQs, but as technology advances and the needs of a network evolve, these traditional routing methods have failed to adapt to these emerging needs.

Increases in customer demands on bandwidth and the number of users who need to access the network have caused problems for WANs, as has new needs from Wi-Fi users such as greater demand for video and guest network access. But these are just some of the many issues the much-hyped SD-WAN products have aimed to address.

Why is SD-WAN needed?

As technology and processes have become more cloud-centric, previous techniques of routing traffic and managing network connections have become unusable. SD-WAN is a more contemporary and future-proofed method of network management and is designed to use a more visual interface from within a cloud instance.

SD-WAN delivers a multitude of benefits that are tailored for cloud-centric enterprise operations. With organisations adopting software as a service (SaaS) and infrastructure as a service (IaaS) more readily, the amount of traffic flowing through the network has increased dramatically and SD-WAN allows organisations to manage it more easily than previous WAN management methods could.

Networking is a notoriously temperamental part of enterprise IT and is often one of the most time-consuming and frustrating elements to troubleshoot. Configuring business wide area network elements to handle a new service or to address a fault usually involves manually issuing commands to each router in the network individually, which can take weeks or even months depending on the size and geographical locations of the network and the complexity of the change.

Previous methods of WAN management involved network administrators having to manually write lines of code to signal where internet traffic should be going which could take a huge amount of time. Moreover, if an error was in just one of the thousands of lines of code, then the administrator would have to arduously comb through each and every one to find it. Having an error in the code could mean vital business processes would be halted, affecting everyone from the staff keeping the company running, to the loyal customers being unable to purchase from or contact it.

With SD-WAN, administrators can apply changes to all routers across the whole network in one fell swoop, simplifying the process massively.

What SD-WAN can do

SD-WAN uses the technologies and principles of cloud computing to make managing WANs far less painful. It achieves this by decoupling the data plane (part of the router that handles the actual data) from the control plane (part of the router which directs the data) and centralising the management and configuration of the WAN itself through a single cloud-based console. This means that bandwidth can be dynamically shared throughout the WAN, and remotely re-allocated rather than having to be reconfigured at the local network level by an on-site engineer. SD-WAN can prioritise bandwidth allocation based on need, elastically scaling a network's bandwidth up and down as needed.

This is the biggest difference between traditional WAN models and SD-WAN: all of the management and configuration of the network can be done remotely from a single management console. This makes provisioning a new branch or office quicker and easier compared to regular WAN. Rather than having to send a network technician down to the site to set up and configure the new office's network in person, the IT team can use their usual management console to set it up according to predefined policies and rules, provisioning and configuring new equipment at the push of a button.

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This is a huge timesaver for branch staff as well as sysadmins, as it means that all they need to do when they have a piece of networking equipment that needs replacing is take it out of the box and plug it in. Instead of having to wait for a technician to come and get it set up, it can be onboarded almost instantaneously. This means quicker time-to-value from new IT hardware and less hassle for your staff as they're left to do their jobs without worrying about setting up networking infrastructure.

Business agility also benefits from SD-WAN, particularly when it comes to expansion. Getting the network up and running no longer has to be a bottleneck when opening a new location - just ship the equipment to the new building, and the aforementioned remote provisioning will ensure that it's set up quickly and painlessly. It aids digital transformation in a similar fashion, allowing businesses to quickly adopt mobile devices, cloud collaboration tools and other transformative technologies without having to put hundreds of hours into making sure the network can support them.

SD-WAN can also help reduce your operational costs in a number of areas. Removing the need for an on-site technician when altering or troubleshooting a network takes travel time and costs out of the equation, making your network engineers more efficient. By the same token, using pre-set templates and profiles means a small, centralised team of network administrators can take care of network operations for a wide geographic area, reducing the need for local technicians.

CIOs can save money on the connections themselves, too; SD-WAN allows them to reduce their reliance on expensive MPLS connections by bundling together bandwidth from standard commercial broadband packages, 4G connections and even satellite links. In addition, the software-defined nature of the technology means that it can be run using commodity hardware, rather than expensive proprietary equipment.

In addition to this, SD-WAN brings huge benefits to the reliability and quality of your connections. Because these networks are centrally controlled, the software can utilise automatic routing and handling rules to ensure that latency-sensitive applications like videoconferencing or VoIP tools always have as much bandwidth as they need to deliver smooth service. What's more, the ability of SD-WAN to group multiple connection types together means businesses can automatically failover to a secondary line if their main connection fails.

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