Despite the hype around SD-WAN and its capabilities, investment decisions still regularly come down to cost. Organisations regularly make the mistake of creating Service Integration and Management (SIAM) silos – separating budgets and decisions into traditional, specialised areas. 

This restricted view isolates SD-WAN from other technical innovations transcending the network. And regional, local, and decentralised decision-making misses SD-WAN’s value as part of a wider architecture encompassing cloud, security, and the network.

By viewing the IT estate as an ecosystem, organizations can gain a holistic understanding of their technical investments. Savings in one area can fund investments in another, making seemingly ambitious projects, like a comprehensive infrastructure transformation, more achievable.

Secure Access Service Edge (SASE) is the ‘as-a-service’ convergence of WAN edge and secure edge. Rather than one ‘thing’ that organisations can price and procure, it requires investment across multiple areas, taking into account policy, capability, and business outcomes. 

SASE investment recognises that network, cloud, and security need to be viewed collectively, with as much ‘as-a-service’ technology deployed as possible – from SD-WAN to secure web gateways, firewalls, cloud access brokers, and even security consulting architecture to introduce greater scalability, agility, and pace.

Developing a single, upfront infrastructure investment case for SASE is the best way to ensure a strategic approach, while also sidestepping the need for multiple business cases. It enables organisations to create an overarching roadmap that clearly outlines savings and outlays. Through this lens, decisions about technology like SD-WAN are less focused on cost and more on longer-term strategy.

When it comes to total cost of ownership (TCO), in our experience only 25% of infrastructure cost relates to overlay. By choosing the cheapest SD-WAN option, businesses are potentially depriving themselves of important features offered by more premium services, without securing significant cost benefits. Simply put, it’s a bad trade-off.

The remaining 75% of the cost comes from underlay, so it has a greater impact on TCO than vendor choice. In the hunt for cost-savings, some organisations offset bandwidth costs using cheaper internet, but it’s important to think about performance and security when considering this route.

Future bandwidth requirement has a huge impact on performance, underlay, and overlay choice. Combined with underlay transformation, all overlays show cost savings with a 0% bandwidth increase. However, zero is unrealistic. A 100% uplift is far more realistic over a 3-5-year period and in some industries up to 200% is achievable. This impacts the point where the TCO breaks even and can increase overall costs.

This is critical to end-user experience and is tied to both underlay transformation and overlay choice. Apps are the lifeblood of an organisation, so delivering these where they are needed, on-demand, and to the approved users is essential. The decision should be centred around balancing the risk of device failure against the cost of reliable performance.

Securing the network is essential. SASE introduces comprehensive, end-to-end security. At this stage, it’s important to include securing internet circuits when breaking out to the cloud and with a holistic approach, security itself can often be fuelled by savings made elsewhere.

The roadmap is an essential tool to address this multifaceted challenge and highlight the link between investments and delivery capability. It illustrates to chief experience officers (CXOs) how SD-WAN delivers capability that can be leveraged and built upon by the next investment while SASE brings to life the importance of developing an infrastructure business case that converges technology, investment, and decision-making to transform the business. 

For SD-WAN and SASE a roadmap illustrates that the whole is greater than the sum of its parts.