How Meraki SD-WAN Improves Multi-Site Connectivity

For UK businesses operating across multiple locations — whether that means two offices in the same city or a dozen branches nationwide — network connectivity between sites is a fundamental operational requirement. Staff need seamless access to shared applications, files, and communication systems regardless of which office they are working from. The network needs to be reliable, secure, fast, and manageable. And increasingly, it needs to support cloud-first architectures where applications and data live in platforms like Microsoft Azure and Microsoft 365 rather than in a central data centre.

Traditional approaches to multi-site networking — MPLS circuits and hub-and-spoke VPN topologies — were designed for a different era. They are expensive, inflexible, slow to provision, and poorly suited to the cloud-centric reality of modern business. Software-Defined Wide Area Networking (SD-WAN) represents a fundamental shift in how multi-site networks are designed, deployed, and managed. And among SD-WAN solutions, Cisco Meraki has established itself as the leading platform for UK SMEs, combining enterprise-grade capabilities with the simplicity and cloud management that smaller organisations need.

This guide explains what SD-WAN is, how Cisco Meraki's SD-WAN solution works, and why it is transforming multi-site connectivity for businesses across the United Kingdom.

What Is SD-WAN?

SD-WAN stands for Software-Defined Wide Area Network. In simple terms, it is a technology that uses software to intelligently manage network traffic across multiple internet connections and sites, replacing or supplementing traditional dedicated circuits like MPLS.

A traditional WAN connects offices using dedicated leased lines or MPLS circuits provided by a telecommunications carrier. These circuits are reliable but expensive, inflexible, and slow to provision — ordering a new MPLS circuit in the UK typically takes 60 to 90 days. SD-WAN, by contrast, can use standard broadband connections, leased lines, 4G/5G, or any combination thereof. The SD-WAN appliance at each site intelligently routes traffic across the available connections based on application requirements, link performance, and defined policies.

The UK Broadband Landscape and SD-WAN

The viability of SD-WAN for UK businesses has been significantly enhanced by the rapid improvement in broadband infrastructure across the country. Full fibre (FTTP) availability has expanded dramatically, with Openreach, CityFibre, and numerous alternative network providers rolling out gigabit-capable connections to business premises in cities and towns throughout England, Scotland, Wales, and Northern Ireland. Where full fibre is not yet available, FTTC connections offering speeds of up to 80 Mbps provide a solid foundation for SD-WAN deployments, particularly when two connections are bonded together.

For businesses in areas where fixed-line options are limited, 4G and 5G cellular connections can serve as primary or backup WAN links within an SD-WAN architecture. The Meraki MX range supports USB cellular modems, allowing a 4G or 5G connection to be added as a failover link at any site. This is particularly valuable for temporary sites, pop-up locations, or rural offices where fixed-line broadband options may be constrained.

The key insight is that SD-WAN transforms the economics of connectivity. Rather than paying a premium for a single, high-reliability MPLS circuit, businesses can achieve superior reliability by combining two or more lower-cost connections. The intelligence sits in the SD-WAN appliance rather than in the network itself, which means you are no longer locked into a single carrier or connection type at each location.

Why Cisco Meraki for SD-WAN?

The SD-WAN market includes numerous vendors — Cisco Viptela, Fortinet, VMware VeloCloud, Silver Peak, and others. Cisco Meraki occupies a distinctive position in this market as the solution best suited to small and medium-sized businesses. Several factors make Meraki particularly attractive for UK SMEs.

Cloud-First Management

Every Meraki device is managed through a single cloud dashboard. There are no on-premise controllers, no management servers, and no complex software to install. Your IT team — or your managed IT provider — can monitor and configure every site from a web browser, anywhere in the world. This cloud-first approach dramatically reduces the complexity and cost of managing a multi-site network.

The Meraki dashboard also provides powerful analytics and reporting capabilities that go far beyond basic device monitoring. Network administrators can view detailed traffic analysis showing which applications are consuming the most bandwidth, identify client devices that are experiencing connectivity issues, and track historical performance trends across all sites. These insights enable data-driven decisions about capacity planning, application prioritisation, and network upgrades. For organisations working with a managed IT provider, the dashboard's role-based access controls allow different levels of visibility and configuration authority to be assigned to different team members or external partners.

Zero-Touch Provisioning

When deploying a new Meraki SD-WAN appliance at a branch office, the device can be pre-configured in the cloud dashboard before it even arrives at the site. Once it is plugged in and connected to the internet, it automatically downloads its configuration from the Meraki cloud and joins the network. A non-technical office manager can perform the physical installation — simply connect power and an ethernet cable. This zero-touch provisioning model means new sites can be brought online in minutes rather than the days or weeks required for traditional network equipment.

Integrated Security

Meraki MX appliances — the devices that provide SD-WAN functionality — also include a full suite of security features: stateful firewall, intrusion detection and prevention, content filtering, malware protection, and VPN connectivity. This means you do not need separate security appliances at each site, reducing both cost and complexity.

Scalability and Future-Proofing

One of the less immediately obvious but strategically important advantages of Meraki SD-WAN is its scalability. Adding a new site to your network is a straightforward process that can be completed in hours rather than weeks. The new MX appliance is registered in the dashboard, assigned to a network template, and shipped to the new location. Once connected, it automatically downloads its configuration and establishes VPN tunnels to all other sites. This scalability is particularly valuable for growing businesses, those involved in mergers and acquisitions, or organisations that need to stand up temporary project offices.

The Meraki platform is also continually updated with new features and capabilities delivered through cloud-based firmware updates. Unlike traditional networking equipment where new features require expensive hardware upgrades, Meraki regularly adds functionality to existing hardware through software updates. Recent additions have included enhanced SD-WAN analytics, improved application visibility, and tighter integration with cloud security services. This means your investment in Meraki hardware continues to deliver increasing value over its operational lifetime.

How Meraki SD-WAN Works in Practice

To illustrate the practical benefits, consider a UK professional services firm with a headquarters in London and branch offices in Birmingham, Manchester, and Edinburgh. Under a traditional MPLS arrangement, the firm would need four expensive leased circuits, with all traffic routing through the London headquarters.

With Meraki SD-WAN, each office has two standard business broadband connections — perhaps one fibre leased line and one FTTP broadband connection. The Meraki MX appliance at each site creates encrypted VPN tunnels to every other site automatically, forming a full mesh network. Traffic is routed intelligently based on application type and link performance.

The practical benefits of this intelligent routing become apparent in everyday business operations. Consider a Monday morning scenario where staff across all four offices are simultaneously logging into Microsoft 365, downloading emails, and joining Teams meetings. The Meraki SD-WAN dynamically allocates bandwidth to ensure that latency-sensitive Teams calls receive priority over bulk email downloads. If one connection at the Birmingham office begins experiencing packet loss due to ISP congestion, the appliance seamlessly shifts voice and video traffic to the secondary connection whilst continuing to use the degraded link for less sensitive traffic. This level of granular, real-time traffic management is simply not possible with traditional routing approaches.

Network Resilience and Business Continuity

For many UK businesses, network downtime translates directly to lost revenue and productivity. A retail business that cannot process card payments, an estate agency that cannot access its property management system, or a solicitors' firm that cannot reach its case management application — each faces immediate operational impact when connectivity fails. Meraki SD-WAN's dual-ISP architecture provides a level of resilience that single-circuit MPLS simply cannot match. If one ISP experiences a complete outage, all traffic is automatically routed through the remaining connection. The failover is typically completed within seconds, and for many applications, users will not experience any interruption at all.

Beyond simple failover, Meraki SD-WAN continuously monitors the health of each connection using metrics including latency, jitter, packet loss, and throughput. If a link begins degrading — perhaps due to congestion during peak hours — the system proactively moves sensitive traffic to the better-performing link before users are affected. This proactive approach to network resilience represents a fundamental improvement over traditional failover mechanisms, which typically only respond to complete link failures.

Application-Aware Routing

Meraki SD-WAN understands application types and routes traffic accordingly. Microsoft Teams video calls, which are sensitive to latency and jitter, are automatically routed over the best-performing link. Bulk file transfers, which are less sensitive to latency, can use the secondary connection. If the primary link at any site degrades or fails, traffic is automatically rerouted to the secondary link within seconds — often without users even noticing.

Direct Cloud Access

One of the most significant advantages of SD-WAN over traditional MPLS is direct cloud access. In an MPLS network, traffic from branch offices to cloud services like Microsoft 365 must typically route through the headquarters first, adding latency and consuming expensive MPLS bandwidth. With Meraki SD-WAN, each site can access cloud services directly over its local internet connection, providing faster performance and reducing the load on inter-site links.

Meraki's cloud-optimised routing is particularly beneficial for organisations heavily invested in the Microsoft ecosystem. The SD-WAN appliance can identify Microsoft 365 traffic and route it directly to the nearest Microsoft data centre via the local internet connection, bypassing the inter-site VPN entirely. Given that Microsoft operates Azure regions and Microsoft 365 front-door servers within the UK, this direct routing can reduce latency for applications like SharePoint, OneDrive, and Exchange Online by 50 percent or more compared to a backhauled MPLS approach.

This direct cloud access model also improves the user experience for Software-as-a-Service (SaaS) applications beyond Microsoft 365. Customer relationship management platforms, accounting software, project management tools, and collaboration applications all benefit from direct internet access at each site rather than being funnelled through a central hub. As UK businesses continue to adopt cloud-first strategies, the importance of direct, optimised cloud access at every location will only increase.

Quality of Experience Monitoring

Meraki SD-WAN includes built-in quality of experience monitoring that provides real-time visibility into how applications are performing across your network. The dashboard displays metrics for individual applications — showing latency, loss, and jitter for services like Microsoft Teams, Salesforce, and other business-critical platforms. This application-level visibility enables your IT team or managed service provider to identify and resolve performance issues before they impact productivity. If staff at your Edinburgh office are experiencing poor Teams call quality, the dashboard can immediately show whether the issue is related to local ISP performance, inter-site VPN congestion, or a problem with the Microsoft service itself.

The Cost Case for Meraki SD-WAN

The financial case for SD-WAN is compelling. Consider the four-site professional services firm described above.

Cost Element	Traditional MPLS (Annual)	Meraki SD-WAN (Annual)
Circuit costs (4 sites)	£36,000	£9,600 (dual broadband per site)
Hardware/appliances	£8,000 (routers, firewalls)	£6,000 (Meraki MX appliances)
Management and licensing	£4,000	£4,800 (Meraki licence)
Security (separate appliances)	£5,000	£0 (included in MX)
Total annual cost	£53,000	£20,400

The SD-WAN approach delivers a 61% cost reduction whilst providing superior performance, better resilience through dual-ISP failover, and integrated security at every site. The savings are even more dramatic for businesses with more locations.

Total Cost of Ownership Considerations

The cost comparison above captures the most visible expenses, but the total cost of ownership calculation for SD-WAN reveals additional savings that are often overlooked. With traditional MPLS, businesses frequently incur charges for moves, adds, and changes to their circuits. Increasing bandwidth on an MPLS circuit often requires a new contract commitment and can take weeks to provision. With SD-WAN over broadband, upgrading to a faster connection is typically straightforward and can often be completed within days.

Staff productivity improvements represent another significant but harder-to-quantify benefit. When cloud applications perform better because of direct internet breakout, when video calls are clearer because of intelligent traffic prioritisation, and when network outages are virtually eliminated through dual-ISP failover, the cumulative productivity gains across your workforce are substantial. For a professional services firm where staff are billing by the hour, even a one percent improvement in productivity across 100 employees represents a meaningful financial return.

There is also the opportunity cost of the IT management overhead associated with traditional networking. Time that your IT team or provider spends managing MPLS circuits, coordinating with carriers, and troubleshooting connectivity issues is time that could be spent on strategic projects that drive business value. The operational simplicity of Meraki SD-WAN frees up this time, allowing your technology resources to focus on initiatives that differentiate your business rather than simply keeping the lights on.

Security Considerations

Security is a common concern when moving from dedicated MPLS circuits to internet-based SD-WAN. However, Meraki SD-WAN addresses these concerns comprehensively. All site-to-site traffic is encrypted using AES-256 encryption, the same standard used by government and military communications. The Meraki MX includes a next-generation firewall, intrusion detection and prevention, and advanced malware protection at every site. Content filtering can block access to malicious or inappropriate websites. And the cloud management platform provides complete visibility into network activity, security events, and threat intelligence across all locations.

For UK businesses subject to Cyber Essentials requirements, the Meraki platform makes demonstrating compliance straightforward, with built-in firewall rules, network segmentation capabilities, and comprehensive audit logging.

Advanced Security Features

Beyond the foundational security capabilities, Meraki SD-WAN offers several advanced features that strengthen your organisation's security posture. Network segmentation through VLANs allows you to isolate different types of traffic — for example, separating guest Wi-Fi from corporate systems, or ring-fencing payment card processing infrastructure from general office traffic. This segmentation is configured centrally and enforced consistently across all sites, ensuring that security policies are applied uniformly regardless of location.

The Meraki Advanced Security licence adds Cisco's Threat Grid malware analysis, Snort-based intrusion prevention, and Cisco Umbrella integration for DNS-layer security. These enterprise-grade security capabilities are delivered through the same MX appliance that provides SD-WAN and firewall functionality, eliminating the need for separate security infrastructure. For UK businesses operating in regulated sectors — financial services, healthcare, legal, and education — these integrated security features simplify compliance with data protection requirements under UK GDPR and sector-specific regulations.

The centralised logging and reporting capabilities of the Meraki platform are also valuable from a security governance perspective. All network events, security alerts, and configuration changes are logged and accessible through the dashboard. This audit trail is essential for demonstrating compliance during regulatory audits and provides forensic evidence in the event of a security incident. The ability to generate compliance reports covering firewall configurations, security event summaries, and access control policies directly from the dashboard significantly reduces the administrative burden of ongoing security governance.

How Cloudswitched Deploys Meraki SD-WAN

At Cloudswitched, we are a Cisco Meraki partner with extensive experience deploying SD-WAN solutions for multi-site UK businesses. Our approach includes a thorough assessment of your current network architecture and connectivity, design of an SD-WAN solution tailored to your specific requirements, procurement and pre-configuration of Meraki hardware, coordinated deployment across all sites with minimal disruption, ongoing monitoring and management through our Network Operations Centre, and regular performance reviews and optimisation.

We handle everything from initial circuit procurement through to day-to-day management, ensuring your multi-site network is fast, reliable, secure, and cost-effective.

Our Deployment Methodology

Our SD-WAN deployment methodology has been refined through numerous projects across a range of UK business sectors. We begin with a comprehensive network assessment that examines your current connectivity arrangements, application requirements, traffic patterns, and business objectives. This assessment informs the design of an SD-WAN architecture that is tailored to your specific needs — there is no one-size-fits-all template.

During the design phase, we work with you to define traffic policies that align with your business priorities. We identify which applications require guaranteed performance, which can tolerate best-effort delivery, and which should be restricted or blocked. We also evaluate the broadband options available at each of your sites and recommend the most appropriate combination of connections to deliver the required performance and resilience.

The deployment itself is carefully coordinated to minimise disruption. We pre-configure all Meraki hardware in our staging environment before shipping it to your sites. The cutover at each location is typically completed in under an hour, with a rollback plan in place should any issues arise. Following deployment, we provide a period of enhanced monitoring to ensure that the network is performing as designed, and we fine-tune traffic policies based on real-world usage patterns observed during the first few weeks of operation.

Ongoing Management and Optimisation

Deploying SD-WAN is not a one-off project — it is an ongoing service that delivers value through continuous monitoring and optimisation. Our Network Operations Centre monitors your Meraki SD-WAN environment around the clock, responding to alerts, investigating performance anomalies, and proactively adjusting configurations to maintain optimal performance. We provide monthly reporting that tracks key metrics including link utilisation, application performance, failover events, and security incidents, giving you clear visibility into the health and performance of your multi-site network.

We also conduct quarterly review meetings to assess whether your SD-WAN configuration remains aligned with your evolving business needs. As your organisation grows, adds new sites, adopts new cloud applications, or changes its operational model, your network configuration should evolve accordingly. Our quarterly reviews ensure that your SD-WAN investment continues to deliver maximum value as your business changes.