Managed SD-WAN: Multi-Site Network Optimisation for UK Businesses

Multi-Site Connectivity Challenges

Businesses with multiple locations face connectivity challenges that single-site businesses do not. Each site needs reliable internet access, but sites also need to communicate with each other — accessing shared servers, ERP systems, or other internal resources. Traditional WAN solutions based on MPLS or hub-and-spoke VPN were built for a time when applications lived in a central datacentre. That architecture does not serve modern, cloud-first businesses efficiently.

SD-WAN addresses these challenges by treating network paths as resources to be intelligently managed rather than static configurations. It enables businesses to use lower-cost broadband circuits alongside leased lines, provides direct cloud access from each site, and delivers the management simplicity that legacy WAN lacks.

Application-Aware Traffic Steering

Not all business traffic is equally important or has the same network requirements. A Teams video call is latency-sensitive and cannot tolerate packet loss. An overnight backup transfer needs bandwidth but is tolerant of delay. SD-WAN applies policies that classify traffic and route each type on the most appropriate available path — real-time traffic on the lowest-latency circuit, bulk transfers on a secondary lower-cost connection.

These policies are configured centrally and applied consistently across all sites. As circuit conditions change in real time, SD-WAN dynamically adjusts routing to maintain application quality within the defined policy parameters.

Resilience and Failover

SD-WAN can aggregate multiple circuit types at each site — a leased line as primary, FTTP as secondary, 4G as an emergency backup. If the primary circuit fails or degrades below acceptable parameters, SD-WAN fails over to the next available path automatically. For voice and video traffic, this failover can be seamless — active calls continue without disconnection in many configurations.

This resilience approach provides a meaningful improvement over single-circuit sites without requiring the expense of a second leased line at every location. A leased line primary with FTTP failover is a common configuration that provides strong resilience at a manageable cost.

Cloud Access Optimisation

Traditional WAN architecture routed all internet-bound traffic back to a central hub before breaking out to the internet. When cloud applications like Microsoft 365 are hosted globally, this adds unnecessary hops and increases latency. SD-WAN supports direct cloud breakout at each site — internet-bound traffic for cloud applications goes directly from the site to the internet, using the nearest Microsoft or cloud provider point of presence.

This direct breakout improves Microsoft Teams, SharePoint, and other cloud application performance noticeably, particularly at sites that previously routed through a distant central hub. Security policies are maintained at each breakout point through integration with cloud security platforms.

Centralised Management and Visibility

One of the most practical benefits of SD-WAN for IT teams is centralised management. Instead of logging into each site's router separately to make configuration changes, all sites are managed through a single SD-WAN controller interface. Policy changes, routing updates, and new site provisioning are all handled centrally. AMVIA uses this capability to manage your entire network from our operations centre.

AmviaIQ provides integrated monitoring of all SD-WAN sites and circuits. Performance dashboards show circuit health, application performance, and failover events. Monthly reports summarise availability, bandwidth utilisation, and any incidents across all locations.

Migration from MPLS

Many businesses exploring SD-WAN are running legacy MPLS circuits that are approaching contract renewal. MPLS provides reliable private connectivity but at a significant cost premium over broadband, and with limited flexibility to adapt to cloud workloads. SD-WAN with a combination of broadband and leased line circuits can replicate the reliability of MPLS at lower cost.

AMVIA manages MPLS-to-SD-WAN migrations carefully, typically running the new SD-WAN infrastructure in parallel during a transition period to validate performance before decommissioning MPLS circuits. Contract timing is reviewed to minimise dual-running costs where MPLS and SD-WAN overlap.