Cost, Security, Performance and When Hybrid WAN Makes More Sense

Your MPLS contract is coming up for renewal.

Meanwhile, more applications are moving to SaaS and cloud. Branches need more bandwidth. Internet connectivity is available in more locations. Security requirements have changed.

That makes SD-WAN vs MPLS a much bigger decision than choosing between two networking technologies.

The question is what your WAN should look like over the next three to five years.

MPLS can still make sense for applications that need predictable performance and private carrier-managed connectivity. SD-WAN can make more sense when an enterprise has distributed branches, multiple connectivity options and a growing amount of cloud traffic. A hybrid WAN can combine both.

The answer depends on your applications, locations, existing contracts, security architecture and total cost of ownership (TCO).

This is the comparison that matters before you sign the next WAN contract.

Start With Why You Are Reconsidering the WAN

The MPLS vs SD-WAN conversation usually starts with a business problem.

For some enterprises, it is the MPLS bill.

For others, it is cloud traffic.

For others, the network team is spending too much time managing branch connectivity.

The trigger matters because it changes what you should measure.

If the problem is cost, start with the current WAN TCO.

If the problem is SaaS performance, look at where application traffic travels today.

If the problem is branch availability, examine the connectivity options available at each location.

If the problem is security, evaluate the entire security architecture rather than treating the WAN transport as the security control.

Current Cisco guidance describes SD-WAN as a way to use multiple transport options and support cloud-oriented traffic patterns, while MPLS remains a carrier-managed transport with predictable paths and service levels.

So the first step is simple:

Define what you need the WAN to improve.

Where MPLS Still Earns Its Place

MPLS has been around for decades because it solved a real enterprise problem.

Large organizations needed predictable connectivity between branches, offices and data centers. They wanted traffic engineering, QoS and carrier-backed service levels. MPLS provided a managed private transport model for that environment.

Those requirements have not disappeared.

A manufacturing plant running a critical application may care more about predictable network behaviour than about having the cheapest possible circuit. A large headquarters may have enough fixed-site traffic to justify a private connection. A location with poor internet connectivity may not have a realistic broadband alternative.

That is where the MPLS vs SD-WAN performance discussion becomes more nuanced.

MPLS can provide predictable performance across the provider network. SD-WAN can select among available paths, but its performance still depends on the quality of the underlying connections.

Existing MPLS contracts can change the calculation

There is another factor that gets overlooked in generic comparisons.

Your current MPLS contract has a financial value.

If the enterprise has recently renewed a favorable agreement, replacing it immediately may introduce termination costs, new equipment, SD-WAN licensing, security subscriptions and migration expenses.

A company approaching renewal after years of increasing bandwidth costs has a different business case.

That is why MPLS pricing should be assessed alongside the cost of changing the architecture.

Where SD-WAN Changes the Economics

SD-WAN introduces a software-controlled overlay network across the available WAN transports.

Those transports can include MPLS, broadband, DIA, fiber and cellular connections.

The important change is the separation between the transport and the policies controlling how traffic uses it.

A branch can have more than one connection.

The SD-WAN platform can then apply centralized routing and application-aware policies across those links.

That gives the enterprise more options when adding bandwidth, introducing backup connectivity or connecting new sites.

It also changes the economics.

Instead of using MPLS as the primary transport at every branch, an enterprise can use lower-cost internet connectivity where it provides sufficient performance.

That does not make every internet circuit a replacement for MPLS.

It gives the network team more choices.

Arche's ChiefNET offering follows this model, providing cloud-native SD-WAN with centralized management, dual ISP connectivity, load balancing and remote monitoring.

Explore Arche's ChiefNET SD-WAN solution

SD-WAN Cost: Look Beyond the Circuit

This is where many SD-WAN cost comparisons become unreliable.

An enterprise cannot compare the monthly price of an MPLS circuit with the price of broadband and call the difference its savings.

The SD-WAN architecture introduces other costs.

There is the edge hardware.

There are software licenses.

There may be security subscriptions.

There is implementation and migration.

There may also be managed-service costs.

The MPLS environment has its own costs, including circuits, provider management, changes, backup connectivity and internal operations.

The meaningful comparison is therefore the five-year WAN TCO.

The number that should go into the business case is not "MPLS costs X and SD-WAN costs Y."

It is:

What will this WAN cost us over three or five years?

How Much Can SD-WAN Actually Save?

This is where the widely repeated 30–50% SD-WAN savings claim needs some caution.

There is no universal savings percentage.

TeleGeography's published scenarios show why. Its modelling found substantially lower annual TCO in some internet-heavy SD-WAN configurations, while more conservative MPLS-DIA hybrid models produced much smaller savings. The result changes depending on transport mix, management model and how much MPLS remains in the final architecture.

That is the important part.

SD-WAN savings depend on what you are replacing.

An enterprise replacing expensive MPLS circuits with broadband and DIA across many sites may have significant transport savings.

An enterprise retaining MPLS at critical locations while adding managed SD-WAN and security services may see a smaller direct cost reduction.

So when a vendor says SD-WAN will save 40%, ask:

40% of what?

The answer should be based on your existing invoices, site requirements and proposed architecture.

Not an industry-wide average.

Security: Which Is Actually Safer?

The answer depends on what you mean by security.

MPLS provides private carrier-managed transport. That separates the traffic from the public internet, but it does not mean the data is automatically encrypted.

SD-WAN takes a different approach.

It can use encrypted tunnels across public or private transports and can integrate segmentation, firewall functions and other security controls. Depending on the architecture, it can also form part of a SASE deployment.

That makes the SD-WAN vs MPLS security comparison more useful when you look at the complete security stack.

MPLS is private transport

The value comes from the carrier-managed path and traffic separation.

If encryption is required, it needs to be implemented as an additional control.

SD-WAN can combine networking and security controls

An SD-WAN architecture may include:

• Encrypted tunnels

• Segmentation

• Application-aware policies

• Secure internet breakout

• Firewall integration

• SASE

• Zero trust controls

But none of those should be assumed simply because a proposal says "SD-WAN."

Ask what is actually included.

Where is traffic inspected?

Who manages the security policy?

Is SASE part of the subscription?

What happens when traffic breaks out directly to the internet?

These questions reveal much more than asking which technology is "more secure."

Palo Alto Networks makes a similar distinction in its current comparison: MPLS provides private transport but not inherent encryption, while SD-WAN commonly combines encrypted connectivity with additional security controls.

Performance Depends on What You Are Connecting

The SD-WAN vs MPLS performance debate often gets reduced to "MPLS is faster."

That is too broad.

MPLS can provide predictable performance across the provider's network and support QoS for important traffic.

SD-WAN can monitor multiple paths and select traffic routes based on policy and network conditions.

The difference becomes clearer when you look at the application.

If a critical application requires predictable latency and the site has limited internet connectivity, MPLS may remain valuable.

If the application is SaaS and the branch has good DIA and broadband, sending traffic through a central data center over MPLS may add an unnecessary path.

Reliability also works differently

An MPLS SLA can provide a contractual service commitment on the private circuit.

SD-WAN can improve resilience by using multiple underlay connections.

One approach gives you predictable service from the transport provider.

The other gives you path diversity.

A branch with two independent internet connections may have a different resilience profile from a branch with one MPLS circuit.

That is why SD-WAN reliability should be assessed at the site level.

Cloud and SaaS Traffic Are Changing the WAN

This is one of the strongest reasons enterprises are reassessing MPLS.

Traditional enterprise traffic often followed this path:

Branch → MPLS → Data Center → Internet

That architecture made sense when the data center hosted most applications.

Cloud adoption changed the traffic pattern.

A branch may now need to reach Microsoft 365, Salesforce, cloud-hosted ERP, collaboration platforms and workloads running in public cloud environments.

That creates more cloud traffic and SaaS traffic that does not necessarily need to pass through a corporate data center first.

SD-WAN can support direct internet access and application-aware routing for these workloads. Cisco identifies cloud and multicloud adoption as a major driver behind enterprises reconsidering traditional MPLS-based WAN designs.

The important question is therefore:

Where does your application traffic need to go?

If most of it still goes between fixed offices and data centers, MPLS can remain a strong option.

If much of it goes directly to cloud and SaaS platforms, SD-WAN becomes more compelling.

Hybrid WAN: The Option Between Renewal and Replacement

This is where the decision becomes practical for many enterprises.

You do not have to retire every MPLS circuit before introducing SD-WAN.

You can build an SD-WAN overlay across the existing MPLS environment and add other transports where they make sense.

The MPLS network remains available for critical traffic.

Internet connectivity can handle other workloads.

The enterprise can then migrate sites over time.

Cisco's migration guidance explicitly considers dual-MPLS, hybrid and LTE designs, along with traffic paths, application access and SaaS/IaaS connectivity during migration planning.

A phased migration can reduce risk

A typical approach might start with selected branches.

The team establishes SD-WAN connectivity while MPLS remains available.

Performance is measured.

Applications are validated.

The next group of sites is then migrated.

Over time, the enterprise can decide which MPLS circuits still justify their cost.

That makes MPLS to SD-WAN migration a controlled business decision rather than a single network-wide cutover.

And hybrid does not have to be temporary.

Some enterprises may continue using MPLS at selected sites while SD-WAN handles the rest of the WAN.

SD-WAN or MPLS? Use Your WAN Profile to Decide

There is no universal winner.

The decision changes based on the environment.

A cloud-heavy enterprise with hundreds of branch offices and good internet availability has a strong reason to evaluate SD-WAN.

A smaller number of sites with highly predictable data-center traffic may have less reason to make an immediate change.

An enterprise with both profiles may be better served by hybrid WAN.

The Questions to Ask Before Signing an SD-WAN Contract

This is where a vendor comparison becomes a buying guide.

Start with the commercial model.

What exactly is included in the SD-WAN pricing?

Is the license based on sites, bandwidth, throughput or another metric?

Does the price include security?

Are analytics included?

What happens at renewal?

Then look at the underlay.

Can you retain MPLS?

Can you use multiple ISPs?

What happens when one link fails?

Who manages the underlying circuits?

Then look at security.

Where is traffic inspected?

What encryption is included?

Is SASE part of the proposal?

How is segmentation implemented?

Finally, ask about migration.

Can sites be moved independently?

Can SD-WAN run over the existing MPLS network?

How will legacy applications be handled?

What is the rollback process?

These questions matter because the cheapest SD-WAN quote is not necessarily the lowest-cost WAN.

SD-WAN vs MPLS for Enterprises in India

The Indian market adds another consideration: connectivity quality varies considerably between locations.

A corporate office in Bengaluru may have several fiber and DIA options.

A manufacturing plant or remote branch may have fewer choices.

That makes enterprise connectivity a site-level consideration.

Before replacing an MPLS circuit with internet connectivity, check the actual options available at that location.

Look at provider diversity, fiber availability, DIA, broadband quality, LTE/5G and repair commitments.

SD-WAN can manage multiple connections.

It cannot fix a poor last-mile connection.

Compliance needs to be assessed separately

There is no blanket rule requiring Indian enterprises to choose MPLS over SD-WAN.

The requirements depend on the industry, data and services involved.

For example, RBI's directions require payment-system data to be stored in India, subject to the provisions of the relevant directions.

CERT-In's directions require covered organizations to maintain ICT-system logs securely for a rolling period of 180 days within Indian jurisdiction.

Those requirements do not tell a CIO which WAN technology to purchase.

They do affect how the network, cloud services, security controls, logging and data flows should be designed.

That is the level at which compliance should enter the WAN decision.

What Arche's Network Projects Tell Us

The best way to understand where MPLS and SD-WAN fit is to look at actual enterprise requirements.

At a major Indian airport, Arche implemented a carrier-grade three-tier MPLS network supporting 25,000 endpoints across more than 50 airport systems. The network included a 10G backbone, 1,000 access switches, 18 distribution switches and two core switches. Layer 2 and Layer 3 VPNs were used for traffic isolation and QoS. The rollout included pre-testing, a pilot and phased implementation while integrating with the existing Terminal 1 network.

That is a good example of an environment where private connectivity, QoS and predictable network behaviour were central to the architecture.

Read Arche's MPLS airport network case study

Arche also implemented SD-WAN across multiple plants and offices in India for a major industrial equipment manufacturer. The network supported manufacturing use cases including AR/VR and asset health monitoring, with the existing network assessed before the wider solution was deployed.

That presents a different requirement: distributed industrial locations, changing technology needs and connectivity across multiple sites.

Read Arche's manufacturing SD-WAN case study

There is also a useful migration example in Arche's airport work. At BIAL, the existing communication network was migrated incrementally to a software-defined architecture, with network segments migrated in phases and security and visibility introduced alongside the new architecture.

Read Arche's SDN migration case study

These projects do not prove that one technology is universally better.

They show something more useful.

The WAN architecture has to follow the requirements of the sites, applications and traffic.

So, Should You Choose MPLS, SD-WAN or Hybrid?

If your WAN is still dominated by fixed-site traffic and predictable application performance, MPLS may continue to earn its cost.

If your enterprise is cloud-heavy, branch-heavy and working with multiple connectivity options, SD-WAN deserves a serious business case.

If your requirements are mixed, hybrid WAN may give you the better path.

The decision should come from three things:

Your traffic. Your sites. Your five-year TCO.

Frequently Asked Questions

Is SD-WAN cheaper than MPLS?

Often, but the savings depend on the architecture. SD-WAN can reduce transport costs by using broadband, DIA and other lower-cost connectivity options, but licensing, hardware, security and managed services add to the TCO. Current industry comparisons show a wide range of outcomes rather than one universal savings figure.

How much can an enterprise save by moving from MPLS to SD-WAN?

There is no reliable universal percentage. Published models vary depending on the connectivity mix and whether MPLS is retained. The enterprise should calculate savings using actual circuit costs, licensing, security, implementation and operations.

Is SD-WAN as secure as MPLS?

They use different security models. MPLS provides private carrier-managed transport but does not automatically encrypt traffic. SD-WAN can use encryption and integrate segmentation, firewalls, SASE and zero trust controls.

Can MPLS and SD-WAN work together?

Yes. SD-WAN can operate across MPLS and other transports as part of a hybrid WAN. This is also a practical approach for enterprises planning an MPLS to SD-WAN migration.

Can SD-WAN run over MPLS?

Yes. MPLS can remain one of the underlay connections while SD-WAN provides the overlay and traffic policies.

Should an enterprise completely replace MPLS with SD-WAN?

Not necessarily. The right approach depends on application requirements, site connectivity, cloud adoption, existing contracts and security architecture.

Does SD-WAN improve SaaS performance?

It can provide a more direct path to SaaS by supporting internet breakout and application-aware routing. The actual result depends on the underlying connectivity and network design.

What happens to MPLS during an SD-WAN migration?

MPLS can remain in place while SD-WAN is introduced. Sites can then migrate in phases and MPLS can be reduced where it no longer provides enough value.

How should CIOs calculate SD-WAN ROI?

Use the complete TCO:

Connectivity + hardware + licensing + security + implementation + migration + operations.

Then compare that cost against the expected bandwidth, resilience, cloud connectivity and operational requirements.

When should an enterprise choose MPLS over SD-WAN?

MPLS can remain appropriate when predictable performance, private connectivity, carrier SLAs or limited internet availability are major requirements.

Still Deciding Between MPLS and SD-WAN?

Start with the numbers, not the technology.

Compare your current WAN TCO with an SD-WAN model and a hybrid option.

Talk to an Arche network architect