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The Shift to SD-WAN: A Deep Dive Into Benefits and Challenges

The Shift to SD-WAN: A Deep Dive Into Benefits and Challenges

Tech continues to evolve with a dizzying pace, and there’s one buzzword that keeps popping up…

Software-Defined Wide Area Network (SD-WAN) is on the lips of enterprise architects and CIOs. It promises to revolutionise network management by offering improved flexibility, cost efficiency, and centralised control. However, the transition away from traditional Multiprotocol Label Switching (MPLS) networks is not without its challenges and misconceptions.

In this article, we will explore the true benefits and potential drawbacks of SD-WAN, drawing insights from industry experts David Macfarlane, Gamma’s Managing Director – Direct, and James Sirrett, Gamma’s Direct Network Support Manager.

Understanding the Appeal

It’s an innovation that has garnered significant attention due to its touted benefits. One of the primary advantages is its potential cost savings, particularly in terms of access circuits. David Macfarlane notes, “The economy of SD-WAN is a cost saving on the access circuits.” This perceived cost reduction is often a driving factor for organisations considering this choice in network.

However, it is crucial to understand that these savings are not always straightforward. James Sirrett explains, “There’s a perception out there that SD-WAN is cheaper. That’s the tagline many CEOs are looking at, and they’re telling their lead architects and everything, ‘I want SD-WAN, it’s cheaper.’ But that isn’t necessarily the case.” In regions like the UK, the cost differences between SD-WAN and MPLS are minimal, primarily due to factors like service level agreements and network reliability.

The cost-benefit analysis

While SD-WAN promises cost savings on access circuits, it often starts more expensive than traditional MPLS. The initial investment in the technology and infrastructure can be substantial. Macfarlane shares, “In most cases in the UK, it does start off a bit more expensive.” The key advantage, however, lies in its ability to offer fast, scalable deployment and cloud-managed control, making it easier for organisations to manage their networks.

One of the significant benefits of this choice in network is the central control model. Sirrett emphasises, “The central control model allows very fast, scalable deployment. It’s easy to bring a site online following a standard template, benefiting from quick deployment, quick management, centralised control, and visibility.” This makes it particularly appealing for organisations needing rapid deployment solutions, such as retail stores or construction sites lacking infrastructure.

Navigating the transition

Switching from a private MPLS network to a public internet-based SD-WAN presents several challenges. While the internet offers ubiquitous connectivity, it lacks the service level agreements and security assurances of private networks. This raises concerns, especially for critical services reliant on consistent and secure connectivity.

Sirrett highlights this challenge, stating, “The internet is ubiquitous, but there’s a fundamental issue with it—service level agreements. It’s a best-efforts network.” Most organisations prioritise security and reliability, making the transition to an internet-based network a complex decision.

Despite these challenges, it’s rapid deployment capabilities make it an attractive option. Macfarlane points out, “SD-WAN allows for a quick deployment model and seamless transition to fixed-line services.” This is particularly beneficial for situations requiring quick connectivity solutions, such as new retail store setups or construction sites.

Security considerations in SD-WAN adoption

Security is a paramount concern when transitioning. Traditional MPLS networks are known for their robust security features, and replicating this level of security on an internet-based SD-WAN network is a significant challenge. However, these devices are now equipped with advanced security features, including next-generation firewalls and secure access service edge (SASE) integration.

Sirrett elaborates, “SD-WAN devices now offer next-generation firewall capabilities, IPsec, and URL categorisation. Security is top of the stack for these devices.” Organisations must ensure that their security posture is maintained across the expanded network perimeter introduced by SD-WAN.

Evaluating organisational readiness

Organisations considering SD-WAN need to evaluate their readiness, particularly if they’ve fully adopted cloud services. For those still relying on on-premises data centres, extending the value of their MPLS investment might be more beneficial before transitioning . Macfarlane advises, “If you’ve moved fully to the cloud and are breaking out all your traffic locally, SD-WAN may be for you. Look at how it aligns with your future technology, the best time to implement, and when to invest.”

SD-WAN can be complex to manage, especially for organisations without the necessary technical expertise. As Sirrett notes, “The skills within their teams have degraded over time, lacking the technical knowledge to manage these systems effectively.” Many organisations opt for fully managed SD-WAN services to mitigate this challenge, allowing them to focus on their core business while experts handle the network complexities.

What’s the future?

SD-WAN offers compelling benefits, including cost savings, rapid deployment, and centralised control. However, organisations must carefully consider the initial costs, security implications, and their overall readiness before making the switch. As Macfarlane concludes, “The move to SD-WAN can be expensive, so businesses need to consider if they’re ready.”

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