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It’s time to upgrade: 5 easy steps to prepare your business for a software-defined WAN


Software-defined wide area network (SD-WAN) technology is the latest stage in a steady evolution that continues to make business communications easier, more agile and less expensive.

SD-WANs are picking up momentum as businesses look to evolve their networks to meet the demands of digital transformation, the Internet of Things (IoT), and other trends.

In fact SD-WAN is tipped to have the same impact that cloud had on the IT industry when it first launched.

Are you ready for SD-WAN?

But how does a business know when it is ready to make this shift? An SD-WAN differs significantly from a traditional network and requires new ways of doing things.

Here are five steps that businesses must take before implementing an SD-WAN:

1. Make sure the infrastructure is ready: For some companies this might mean upgrading hardware, and for others software, but for most it’s probably both. For all, it is important to think ‘end to end’ to ensure that all the elements across their communications networks are ‘SD-WAN ready’ before deployment. They need to make sure their existing networks, and all their component parts, are completely up-to-date and working optimally before the project begins.

2. Do an application audit: To wring maximum benefit from an SD-WAN deployment, businesses need a sound understanding of what applications traverse their network and what communications traffic patterns are like – essentially what digitised information is going where.

Get your ducks in a row

It’s essential to know what dependencies the various applications have, which ones are subject to what types of network issues. Problems include packet loss, where chunks of information fail to reach their destination; jitter, which slows data travelling across the network; and delay. How much network capacity each data type consumes is another key factor.

A business might choose a hybrid WAN, where part of the network allows data to run across broadband, while the rest still uses MPLS (multi-protocol label switching) communications. MPLS is geek-speak for the technology that has driven networks successfully but very expensively for a decade or more. An SD-WAN can handle both Internet and MPLS, allowing a business to move to a full Internet-driven network when its current MPLS contracts terminate. This setup can yield savings as high as 50-60 per cent.

Taking the next step

Before moving to an SD-WAN, network managers need to understand which applications must run over MPLS and which ones will run on broadband without a significant drop in performance. An application audit can answer all these questions and help organisations to build an application strategy. Without this, the impact of an SD-WAN will be minimal.

3. Change the organisational structure. In most companies, the IT network, application, and compute teams work independently and interact very little with each other. Although this has never been ideal, it was sufficient in a legacy IT world. With SD-WANs, these IT sub-departments need to work together as a tightly integrated team. Applications and compute infrastructure are highly dependent on the network, meaning that a significant amount of collaboration will be required to ensure that business productivity does not suffer.

4. Rethink IT security. Although securing a legacy network is not easy, it is relatively straightforward as there are few ingress/egress points and attack surfaces. With an SD-WAN, data traffic patterns change, branch offices have direct Internet access and the number of attack points grows.

We have to keep up

As a result, traditional security tools that guard the network perimeter are no longer effective in a software-defined world. It is important to re-think security strategy and install security solutions that will continuously gather network data, analyse it and look for anomalies. In this way security will become pro-active rather than reactive.

5. Evolve network operations skills. When the network infrastructure is ready and the applications have been studied, a business needs a network operations team capable of supporting it. Managing virtual workloads, network architectures, orchestrating services and analysing data requires significantly different skills compared to managing network routers. If an organisation lacks appropriate internal skills, it should consider using a managed service as a way of bridging the gap.

Evolving to an SD-WAN offers a strong ROI for businesses but many of the benefits could be negated if the proper pre-work is not carried out carefully. Be aggressive with an SD-WAN, but remember it is essential to ensure that the organisation is ready.

Doug Farndale is the Vice President Asia Pacific at Silver Peak

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