MPLS vs SD-WAN: Which wide area network solution is right for your business?

Your network underpins many of the things your business does every day. Whether your teams are using cloud applications, joining video calls, accessing customer systems or sharing data between locations, reliable connectivity is essential.

But the way businesses use their networks has changed. More organisations are relying on cloud services, supporting teams across different locations and expecting their connectivity to adapt as their needs change.

That’s why many businesses are reviewing their wide area network (WAN) strategy.

For years, MPLS was the standard approach for connecting business locations. It remains a reliable option for organisations that need predictable performance and strong control over their network traffic. However, the rise of cloud applications and more flexible ways of working has led many businesses to consider SD-WAN as an alternative.

So, when comparing SD-WAN vs MPLS, which option is right for your business?

The right choice comes down to how your organisation works, the applications you rely on and what you need from your network. SD-WAN is becoming an increasingly popular choice for businesses looking for more flexibility and visibility, while MPLS continues to play an important role where consistent performance and specific requirements matter.

This guide explains the difference between MPLS and SD-WAN, including the costs, performance considerations and migration options to help you decide which approach fits your business.

What are MPLS and SD-WAN?

What’s the difference between MPLS and SD-WAN?

To understand the difference between MPLS and SD-WAN, it helps to look at how each technology manages traffic across a business network.

Both can connect offices, sites and users, but they take different approaches to managing connectivity.

What is MPLS?

MPLS (Multiprotocol Label Switching) is a private networking technology that has been widely used by businesses to connect offices, branches and data centres.

Rather than relying on the public internet, MPLS uses a provider-managed private network to control how traffic moves between locations. This allows businesses to apply quality of service (QoS) policies, helping prioritise important applications and maintain predictable performance.

For organisations running business-critical systems that rely on consistent connectivity, MPLS can provide reliable and controlled network activity.

Common MPLS use cases include:

• Connecting multiple offices and locations
• Supporting applications that require consistent performance
• Managing traffic across a controlled private network
• Meeting specific operational or compliance requirements

MPLS remains a strong choice for businesses with established networks, predictable traffic patterns or applications where consistent performance is a priority. However, it can be less flexible when organisations need to quickly add locations, increase bandwidth or adapt to growing use of cloud applications.

What is SD-WAN?

Instead of relying on a single type of connection or fixed network path, SD-WAN (software-defined wide area networking) uses software-based controls to manage traffic across multiple connections.

These connections could include:

• Leased lines
• Business broadband
• Ethernet
• 4G or 5G connectivity
• Other internet connections

SD-WAN monitors network conditions and can route traffic according to factors such as application requirements, performance and availability.

This gives businesses more control over how their network is managed and allows them to combine different connectivity options to suit different locations and requirements.

For organisations using cloud applications, operating across multiple sites or supporting hybrid working, SD-WAN can provide the flexibility needed to manage a more distributed network.

So, the main difference between MPLS and SD-WAN is how traffic is managed. MPLS provides controlled connectivity through a private network, while SD-WAN uses software-based management and intelligent routing to make better use of different connections.

Networking mythbusting: common misconceptions about SD-WAN

SD-WAN is increasingly presented as the default option, but there are still some common misconceptions about what it means for businesses.

Some organisations assume that SD-WAN is too complex to manage, that it requires existing connectivity to be replaced or that simply increasing bandwidth will solve every network performance issue.

Our Networking mythbusting video explores some of the common assumptions around SD-WAN, including security, complexity, bandwidth and migration.

If the video does not load, watch Networking mythbusting on YouTube.

For many businesses, moving to SD-WAN doesn’t mean replacing everything immediately. A phased approach can allow organisations to introduce SD-WAN alongside existing connectivity, including MPLS, before deciding on the right long-term strategy.

MPLS vs SD-WAN: Which does your business need?

There’s no single answer when comparing MPLS and SD-WAN. The right choice depends on how your business operates, the applications you rely on and what you need from your network.

A business with a small number of established locations may have very different requirements from a large organisation operating across many sites. Equally, a business running critical applications that need predictable performance may make a different decision from one that relies heavily on cloud services and flexible connectivity.

When deciding between MPLS and SD-WAN, consider the following:

Questions to ask before choosing a WAN solution

Before deciding whether MPLS or SD-WAN is right for your business, it helps to consider how your network needs to support your organisation.

• How many locations do you need to connect?
• Are your applications mainly in your own data centres, or are you increasingly using cloud platforms?
• Do certain applications require predictable performance?
• How important is flexibility when adding sites or increasing bandwidth?
• Would greater visibility and control over network traffic help your IT team?

For many businesses, the decision isn’t simply about replacing one technology with another. It’s about choosing a WAN approach that supports the way the organisation needs to operate now and in the future.

Cost comparison: What will MPLS and SD-WAN actually cost?

Cost is often an important factor when businesses compare MPLS vs SD-WAN. However, there is no standard price for either approach.

The cost of your WAN depends on factors such as the number of locations you need to connect, the connectivity available at each site, your bandwidth requirements and the level of management and support you need.

So rather than asking whether MPLS or SD-WAN is always cheaper, it’s more useful to consider which approach gives your business the best balance of cost, performance and flexibility.

Long-term value and return on investment

For some businesses, SD-WAN can provide long-term value by allowing them to make better use of different connectivity options, improve application performance and simplify network management.

For example, a business with multiple locations may be able to combine different connection types rather than relying solely on dedicated circuits. SD-WAN can then help manage how traffic uses those connections.

However, MPLS can still provide value where predictable performance, existing network investment or specific operational requirements are more important than flexibility.

The best approach depends on your current network, your future plans and what your business needs from its connectivity.

If you’re comparing SD-WAN vs MPLS cost, our specialists can help you understand the options available and assess which approach makes sense for your organisation.

Performance and reliability comparison

Performance and reliability are two of the most important considerations when choosing a WAN solution.

Both MPLS and SD-WAN can provide reliable business connectivity, but they manage traffic in different ways.

MPLS focuses on predictable performance through a controlled private network, while SD-WAN uses software-based management and intelligent routing to make better use of available connections.

Predictable performance (MPLS) vs intelligent routing (SD-WAN)

One of the key strengths of MPLS is its ability to provide predictable network performance.

Because traffic travels through a controlled provider-managed network, businesses can apply quality of service (QoS) policies to prioritise important applications.

For example, a business might use MPLS to ensure voice calls, video conferencing or critical operational systems receive priority over less time-sensitive traffic such as large file transfers or software updates. This can help maintain a consistent experience when network capacity is under pressure.

SD-WAN takes a different approach.

Rather than relying on a single predetermined route, SD-WAN monitors network conditions and can intelligently direct traffic according to application requirements, performance and availability.

This can help businesses:

• Prioritise important applications
• Respond to changing network conditions
• Make better use of available connections
• Improve visibility of network performance

The right choice depends on your business priorities. Organisations that need predictable traffic handling may benefit from MPLS, while those looking for greater flexibility in how traffic is managed may prefer SD-WAN.

Network resilience and failover

Network resilience is essential for businesses where connectivity issues can affect customers, employees or critical operations.

Traditional MPLS networks are built around dedicated connections between locations. This can provide a stable and predictable service, but businesses may need additional connectivity in place if they want protection against individual circuit failures.

SD-WAN can support a more flexible approach to resilience by allowing businesses to combine multiple connections.

For example, an organisation could combine a leased line with a broadband connection and use SD-WAN to manage traffic across both. If one connection experiences an issue, traffic can be redirected to help maintain availability.

This can be particularly useful for businesses with:

• Multiple sites with different connectivity requirements
• Remote or hard-to-reach locations
• A need to maintain access to important applications
• Plans to use different connection types across their network

However, resilience still depends on the overall network design. SD-WAN can help manage multiple connections, but businesses still need to consider their applications, locations and backup options when planning their connectivity.

Cloud application performance

Many organisations now rely on cloud-based platforms for everyday work, including productivity tools, collaboration services, customer systems and specialist applications.

This changes the way traffic moves across a network.

Traditional WAN designs were often built around connecting offices back to a central data centre. This approach can still work well, but it may be less efficient for businesses where applications are hosted in the cloud.

SD-WAN can help by allowing businesses to manage traffic based on application requirements and network conditions, rather than sending everything through a central location.

For example, a business could prioritise voice and video traffic while allowing less time-sensitive activities such as file downloads to use available capacity without affecting critical services.

This can help improve user experience and give IT teams better visibility into application performance across the network.

When MPLS makes sense

While SD-WAN is becoming the obvious choice for modern business networks, MPLS still remains the right option for many organisations.

The decision isn’t simply about choosing the newest technology. It’s about understanding what your business needs from its connectivity.

For some organisations, the predictable performance, controlled network environment and established architecture provided by MPLS continue to offer real value.

Businesses that need predictable performance

Some businesses rely on applications where consistent network performance is a priority.

For example, organisations running specialist operational systems, voice services or other business-critical applications may benefit from the predictable traffic management that MPLS provides.

By controlling how traffic moves across the network and applying quality of service (QoS) policies, MPLS can help ensure important applications receive the priority they need.

Businesses with established networks and predictable requirements

MPLS can be a good fit for businesses with established locations and relatively stable connectivity needs.

If an organisation has a fixed number of sites, predictable traffic patterns and a network design that already works well, continuing with MPLS may be the right decision.

That doesn’t mean SD-WAN is unsuitable. It simply means that changing technology should solve a business problem rather than being an objective in itself.

Businesses with specific operational or compliance requirements

For some organisations, regulatory, contractual or internal requirements influence how their network is designed.

MPLS provides private connectivity between locations, which can be valuable for businesses that need greater control over how traffic moves across their network.

However, private connectivity and security are not the same thing. A private network still requires appropriate security controls, monitoring and management.

For businesses with specific requirements, MPLS can remain an important part of a wider connectivity strategy.

When SD-WAN makes sense

SD-WAN makes sense for businesses that need their network to adapt to changing requirements.

It can be particularly useful for organisations that rely heavily on cloud applications, operate across multiple locations or need more flexibility over how their connectivity is managed.

That doesn’t mean every business needs to move away from MPLS. The right approach depends on your existing network, applications and priorities.

Cloud-first or multi-cloud environments

Many businesses now rely on cloud platforms for everyday operations, from productivity tools and collaboration services to customer systems and specialist applications.

This changes how traffic needs to move across a network.

Traditional WAN designs were often built around connecting offices back to a central location where applications were hosted. However, when services are delivered from the cloud, businesses may need a different approach to managing connectivity.

SD-WAN can help organisations manage traffic based on application requirements and network conditions, helping users access cloud services more efficiently.

For businesses using multiple cloud platforms or a growing number of software-as-a-service (SaaS) applications, SD-WAN can provide greater visibility into how those services are performing.

Multi-site businesses with changing connectivity needs

Businesses with multiple locations often have different requirements from each site.

A head office may need high-capacity connectivity to support a large workforce, while a smaller branch office may only need enough capacity for essential services.

SD-WAN can help businesses design a network around those different needs by allowing them to combine different connectivity options.

For example, an organisation could use:

• Leased lines at larger sites where performance is a priority
• Broadband connections where flexibility or cost efficiency are more important
• 4G or 5G connectivity for additional resilience

SD-WAN can then help manage traffic across those connections, applying policies to determine the best route for different applications.

This can be particularly useful for growing businesses that need to add locations, adapt their network or support changing demands.

Remote workforce and branch connectivity

Many businesses now support employees across offices, remote locations and shared environments, making it more important to provide consistent access to business applications.

SD-WAN can help organisations apply a consistent approach to managing connectivity across different locations.

By centralising network management, IT teams can apply policies across multiple sites, improve visibility and identify potential issues more easily.

For businesses with distributed teams, this can reduce some of the complexity involved in maintaining reliable connectivity across a wider organisation.

Businesses looking to modernise their WAN

For some organisations, SD-WAN is attractive because it provides a practical way to update their network without relying on a single connectivity model.

Rather than designing every site around the same type of connection, businesses can choose the approach that best fits each location.

This can help organisations make better use of available connectivity, improve resilience and create a network that can adapt as requirements change.

However, the value of SD-WAN isn’t simply about reducing connectivity costs. A well-designed solution should help the business operate more effectively by improving how traffic is managed and giving teams better insight into network performance.

Hybrid solutions: Combining MPLS and SD-WAN

Choosing between MPLS and SD-WAN doesn’t always mean choosing one or the other.

For many organisations, a hybrid approach can provide a better option – keeping MPLS where it delivers value while introducing SD-WAN where greater flexibility or control is needed.

This can be particularly useful for businesses that have already invested in MPLS but want to modernise their network gradually.

Using SD-WAN to extend MPLS investment

A move to SD-WAN doesn’t mean you have to replace an existing WAN overnight.

Some businesses use SD-WAN alongside MPLS, keeping MPLS connectivity for locations or applications where predictable performance is important, while using other connectivity options where greater flexibility is beneficial.

For example:

• Critical applications could continue using MPLS
• Less sensitive traffic could use alternative connectivity
• New sites could be deployed using SD-WAN rather than extending an existing MPLS network

This approach allows businesses to modernise their connectivity at a pace that suits them.

Migration path from MPLS to SD-WAN

For businesses considering MPLS to SD-WAN migration, understanding the current network is the first step.

That includes:

• Which applications are most important
• How traffic currently moves between locations
• Where resilience is needed
• What connectivity options are available at each site

From there, businesses can decide whether a phased migration or a wider rollout is the right approach.

A phased migration can help reduce disruption by introducing SD-WAN gradually, allowing teams to test performance, make adjustments and move locations when they’re ready.

With the right planning and support, businesses can transition from MPLS to SD-WAN while maintaining the reliability their teams and customers depend on.

Frequently asked questions about MPLS and SD-WAN

Can SD-WAN replace MPLS completely?

Yes, SD-WAN can replace MPLS for some businesses, but it isn’t the right approach for every organisation.

Many businesses choose SD-WAN because it provides greater flexibility, particularly when they rely on cloud applications, operate across multiple locations or need to use different types of connectivity.

However, MPLS can still be the right choice where predictable performance, established network design or specific operational requirements are important.

For some organisations, a hybrid approach combining MPLS and SD-WAN provides the best balance.

Is MPLS more secure than SD-WAN?

Neither MPLS nor SD-WAN is automatically more secure. Security depends on how the solution is designed, configured and managed.

MPLS provides private connectivity between locations, which can help businesses maintain greater control over how traffic moves across their network.

SD-WAN solutions can include security features such as encryption, segmentation and centralised policy management, helping businesses control access and separate different types of traffic.

The right security approach depends on your business requirements, applications and wider network design.

Can I run MPLS and SD-WAN together?

Yes. Many businesses use MPLS and SD-WAN together as part of a hybrid network strategy.

This allows organisations to keep MPLS where it provides value while introducing SD-WAN where greater flexibility or different connectivity options would be beneficial.

For example, a business might continue using MPLS for applications that require predictable performance, while using SD-WAN to manage other traffic across broadband, leased lines or other connectivity options.

A hybrid approach can also provide a practical migration path for businesses moving from MPLS to SD-WAN.

What are the risks of migrating from MPLS to SD-WAN?

The main risks of migrating from MPLS to SD-WAN usually come from insufficient planning.

Before making changes, businesses need to understand:

• Which applications depend on the network
• How traffic currently moves between locations
• Which sites require additional resilience
• What connectivity options are available

A carefully planned migration can help minimise disruption. This may involve introducing SD-WAN gradually, testing performance and moving locations in phases.

Working with an experienced networking provider can help businesses design a migration approach that fits their operational requirements.

Choose the right WAN approach with Zen

Choosing between MPLS and SD-WAN isn’t just a technology decision. What looks the obvious choice on paper might not fit the way your business operates.

For some organisations, SD-WAN provides the flexibility and visibility needed to support cloud applications, multiple locations and changing requirements.

For others, MPLS remains the right choice where predictable performance, established network design or specific operational requirements are important.

Zen can help you assess your current network, understand your options and choose the approach that best fits your business – whether that means continuing with MPLS, moving to SD-WAN or combining both as part of a hybrid solution.

Our WAN specialists can support you through every stage, from connectivity planning and migration through to ongoing management.

Choose the right WAN for your business

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