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• Cybersecurity Glossary

SD-WAN vs MPLS: differences and when to migrate

MPLS (Multiprotocol Label Switching) is a carrier technology that forwards traffic along predetermined label switched paths across a private operator backbone, delivering predictable performance with strong SLAs at a premium price. SD-WAN (Software Defined Wide Area Network) is an overlay architecture that builds encrypted tunnels over any transport (internet broadband, fiber, 4G/5G, and MPLS itself) and steers each application over the best available path in real time. The two are not direct substitutes: MPLS is a transport, SD-WAN is an intelligence layer above transports. The real question for most enterprises is not “which one” but “how much MPLS do we still need once SD-WAN is in place”. This page compares both across cost, performance, security and cloud readiness, and lays out the migration paths Teldat sees working in production networks.

1What are MPLS and SD-WAN?2Key technical differences3SD-WAN vs MPLS: side by side4The cost equation in detail5When to migrate or not6Migration paths that work in practice7How Teldat runs the transition8Frequently asked questions – FAQ’s

What are MPLS and SD-WAN?

MPLS is a packet forwarding technology operated by carriers since the early 2000s. Traffic entering the operator network gets a label, and routers along the path forward it based on that label rather than on IP lookups, following an engineered path with reserved capacity. The result is a private WAN service with predictable latency, low jitter and contractual SLAs. The price of that predictability: MPLS circuits cost several times more per megabit than internet broadband, take weeks or months to provision, and every site’s traffic is backhauled through the carrier network even when its destination is a cloud service reachable directly.

SD-WAN is not a circuit. It is a software layer that sits on edge devices at each site, builds encrypted overlay tunnels across whatever transports are available, measures loss, latency and jitter on each path continuously, and steers each application over the path that meets its requirements at that moment. A video call can ride the MPLS circuit while bulk backup traffic takes broadband; if the broadband degrades, traffic shifts in seconds without dropping sessions.

The practical consequence: SD-WAN turns transport into a commodity decision. Once the overlay handles encryption, path selection and failover, the underlying circuit can be MPLS, fiber internet, cable or 5G FWA, chosen per site on price and availability rather than on a single carrier’s footprint. That is what makes the migration question an economic one rather than a purely technical one.

Key technical differences

MPLS and SD-WAN differ in where the intelligence lives, who controls it and what you pay for. The six differences below are the ones that actually drive migration decisions, beyond the marketing simplifications.

1
Transport vs overlay
MPLS is a transport service you buy from a carrier; the intelligence lives in the carrier network. SD-WAN is an overlay you operate (or have operated for you) on your own edge devices; the intelligence lives at your sites and in your orchestrator. This is why the two combine naturally: SD-WAN can use MPLS as one of its transports.
2
Path control
In MPLS, the carrier engineers the path and you consume it. Changing QoS classes or adding capacity is a service request with a lead time. In SD-WAN, path selection is policy you define and change centrally: application X prefers the lowest latency path, application Y needs loss under 1 percent, and the overlay enforces it per packet flow, automatically.
3
Cloud traffic patterns
MPLS was designed for site to data center traffic. Cloud and SaaS traffic over MPLS gets backhauled to a central breakout and then out to the internet, adding latency to every Microsoft 365 or Salesforce session. SD-WAN breaks out internet traffic locally at each site with security applied at the edge or via a cloud SSE, cutting the round trip dramatically.
4
Provisioning speed
A new MPLS circuit takes from several weeks to months, with civil works where no carrier fiber exists. An SD-WAN site activates over any available transport (existing broadband, 4G/5G FWA) in days, with Zero Touch Provisioning bringing the device online without a field engineer. For businesses opening sites frequently, this difference alone often decides the migration.
5
Cost structure
MPLS pricing is per circuit with bandwidth tiers, typically several times the cost per megabit of business broadband. SD-WAN cost is the edge device, the license and the chosen transports. Most enterprises that migrate report bandwidth increases of 3x to 10x at flat or lower total WAN spend, by replacing or downsizing MPLS circuits with larger broadband links.
6
Failure behavior
An MPLS site with a single circuit is down when that circuit is down, however good the SLA. An SD-WAN site with two diverse transports (broadband plus 5G FWA, or broadband plus a retained MPLS circuit) keeps sessions alive through sub second path failover. Availability becomes an architecture property rather than a contractual promise.

SD-WAN vs MPLS: side by side

The table below contrasts MPLS and SD-WAN across the dimensions that matter in a WAN procurement or renewal decision. Note that the comparison is between an MPLS only WAN and an SD-WAN over mixed transports; a hybrid of the two (SD-WAN using a retained MPLS circuit where it earns its cost) inherits the best column of each row.

Dimension MPLS SD-WAN
What you buy Private circuit service from a carrier, per site Overlay software and edge devices over any transport
Cost per megabit High; premium for engineered private capacity Low; commodity broadband, fiber or FWA per site
Typical provisioning time Weeks to months per circuit Days; ZTP over existing or cellular transport
Latency and jitter Excellent and contractually guaranteed Very good on quality transports; managed per app by the overlay
SLA model Carrier SLA per circuit Architecture based availability via multi path failover
Cloud and SaaS access Backhauled through central breakout; added latency Local breakout per site with SSE security; direct path
Bandwidth scalability Tiered upgrades through the carrier, with lead time Add or upgrade transports per site, on market terms
Encryption Private by separation, not encrypted by default All overlay traffic encrypted end to end by default
Visibility and control Carrier portal and periodic reports Per application, per path telemetry in real time
Best fit Sites with strict latency contracts and stable traffic to private data centers Cloud first organizations, distributed sites, fast changing footprints

The hybrid answer is the honest answer. Very few enterprises rip out every MPLS circuit on day one, and very few should. The pattern that works: deploy SD-WAN across all sites first, using existing MPLS as one of the transports. Then let the telemetry show which circuits still earn their premium (usually a handful of latency critical sites) and let every other contract lapse into broadband plus FWA. Teldat CNM SD-WAN Suite manages MPLS, internet and 5G transports as equals in one overlay, which is what makes this gradual approach operationally clean.

The cost equation in detail

The business case for migration is usually framed as “SD-WAN is cheaper”, which is true but incomplete. The real cost equation has six terms, and two of them can surprise in the wrong direction if they are not planned. Here is where the money actually moves.

1
Circuit cost: the headline saving
Replacing or downsizing MPLS circuits with business broadband and FWA is where the visible saving lives. Per megabit, the difference is typically a factor of 3 to 10 depending on country and site location. Most migrations fund themselves on this line alone, especially across tens or hundreds of branches.
2
Bandwidth uplift: the hidden value
Most organizations do not pocket the full circuit saving; they spend part of it on much larger links. A branch that had 10 Mbps of MPLS often ends up with 300 Mbps of fiber plus an FWA backup at lower total cost. The value shows up as better application performance and headroom for video, cloud and backup traffic, not just as a lower invoice.
3
Edge hardware and licenses
SD-WAN adds the edge device and license per site. On a Teldat deployment this line is offset by consolidation: the same device replaces the old router, the branch firewall and often the Wi Fi controller, since routing, NGFW and wireless are integrated. Counting the boxes removed matters as much as counting the boxes added.
4
Operations and skills
Centralized orchestration reduces per site operational effort dramatically (template based configuration, ZTP, single pane monitoring), but the team needs SD-WAN skills it may not have on day one. Budget for training or for a co managed model during the first year; this is the most commonly underestimated line.
5
Migration project cost
The transition itself has a cost: parallel running of old and new circuits for some months, site visits where ZTP cannot cover, project management across carriers with different notice periods. A realistic plan stages migration by site waves and times circuit cancellations to contract renewal dates to avoid early termination fees.
6
Security consolidation savings
Often missed in the business case: SD-WAN with embedded NGFW and a cloud SSE replaces separate branch firewalls, VPN concentrators and standalone web proxies. On Teldat deployments, folding be.Safe Pro SSE into the same project frequently turns a neutral WAN business case into a clearly positive one, because the security stack renewal is avoided entirely.

When to migrate or not?

Migration timing is a per site decision, not a binary corporate one. The six signals below separate the sites that should move first from the ones where keeping MPLS, at least for now, is the defensible choice.

1
Migrate first: cloud heavy branches
Sites whose traffic is mostly Microsoft 365, Salesforce, cloud ERP and SaaS gain the most from local breakout. Backhauling that traffic over MPLS to a central firewall adds latency to every session and consumes expensive circuit capacity on traffic that never needed to touch the data center.
2
Migrate first: sites at contract renewal
MPLS early termination fees can erase a year of savings. The clean play is to align the SD-WAN rollout wave with each circuit’s renewal date: deploy the overlay while MPLS is still active, validate for a few weeks, then let the contract lapse instead of renewing.
3
Migrate first: fast growing footprints
If the business opens, moves or closes sites regularly (retail, logistics, services), provisioning time dominates the decision. SD-WAN over broadband and 5G FWA activates a site in days. Waiting two months for an MPLS circuit at every new location is an operational tax that compounds.
4
Keep MPLS for now: hard latency contracts
Sites running real time applications with strict round trip budgets to a private data center (trading floors, some industrial control, broadcast contribution) may still justify an engineered circuit. The right move is to keep MPLS there as one SD-WAN transport, not to keep the whole network on MPLS because of a few sites.
5
Keep MPLS for now: poor local internet markets
In locations where business broadband is weak and cellular coverage is marginal, the MPLS circuit may simply be the best transport available. SD-WAN still adds value (encryption, visibility, failover to whatever second path exists), but the circuit replacement saving is deferred until local options improve.
6
The decision rule
Score each site on three questions: where does its traffic actually go (cloud vs data center), what does its MPLS renewal calendar look like, and what transport alternatives exist locally. Sites that score cloud heavy, near renewal and well served migrate in the first wave. The telemetry from those sites then builds the case (or the counter case) for the harder ones.

Migration paths that work in practice

There is more than one way to get from an MPLS WAN to an SD-WAN. The six patterns below are the ones Teldat sees working in real enterprise migrations, ordered roughly from most conservative to most aggressive.

1
Overlay first, transports unchanged
Deploy SD-WAN edge devices at every site using the existing MPLS as the only transport. Nothing changes in connectivity, but you gain encryption, per application visibility and central orchestration. This de risks the platform decision before any circuit decision, and the telemetry gathered becomes the evidence base for the next phase.
2
Dual transport hybrid
Add a broadband or FWA link alongside MPLS at each site. SD-WAN steers latency sensitive traffic over MPLS and bulk plus cloud traffic over the new link. Most enterprises stabilize here for a year: the MPLS circuit shrinks to a smaller, cheaper tier while the broadband carries the growth.
3
Wave based replacement
Migrate sites in waves aligned to MPLS renewal dates: overlay on, second transport in, validation period, circuit lapsed. Waves of 10 to 50 sites per month are realistic with ZTP. This is the standard pattern for large branch networks and the one with the cleanest financials.
4
Internet first with FWA resilience
New sites and low criticality branches skip MPLS entirely: business broadband as primary, Teldat 5Ge FWA as secondary. Availability comes from path diversity rather than from a carrier SLA. This is now the default design for retail and distributed services networks.
5
Regional hub retention
Keep a small MPLS core between data centers and regional hubs where deterministic site to site latency matters, and run all branches on internet plus FWA into those hubs. This concentrates the MPLS spend where it has engineering justification and removes it everywhere else.
6
Full internet WAN
The end state for cloud first organizations: no MPLS at all, every site on diverse internet and cellular transports, security delivered at the edge (embedded NGFW) and in the cloud (be.Safe Pro SSE), and the overlay providing application SLAs through path selection, FEC and packet duplication. Reached gradually, this is where most migrations are heading.

How Teldat runs the transition?

Teldat has been building enterprise WAN equipment for over 35 years and runs some of the largest SD-WAN deployments in Europe. The CNM SD-WAN Suite was designed for exactly the scenario this page describes: networks that start on MPLS, move through a hybrid phase and end on diverse internet transports, without changing platform at any point along the way.

1
MPLS and internet as equal transports
The CNM SD-WAN Suite treats MPLS, fiber, broadband, and 4G/5G FWA as equal members of the overlay. Application aware routing, SLA based steering, FEC and packet duplication work identically across all of them, so the transport mix at each site is a pure economics decision, never a platform constraint.
2
Zero Touch Provisioning at wave scale
Migration waves live or die on site activation speed. Teldat ZTP ships preconfigured devices that self provision over any transport, including cellular, letting an installer with no network skills bring a branch online in minutes. Waves of dozens of sites per month are standard practice.
3
Embedded NGFW and integrated security
Every Teldat edge device includes an embedded NGFW, extending to be.Safe Pro SSE for cloud delivered SASE (SWG, CASB, ZTNA) and be.Safe XDR for AI powered detection. Local internet breakout, the key performance win of the migration, is protected from day one without separate firewall projects.
4
Per application telemetry for the business case
CNM Visualizer exposes per application, per path performance continuously. During a hybrid phase this telemetry answers the migration question with data: which sites still need their MPLS circuit, and which have been running every SLA sensitive application happily over broadband for months.
5
Proven at European scale
Teldat operates the largest SD-WAN and XDR deployment in Europe at the Junta de Andalucia: 2,700 sites with centralized management and AI powered threat detection. Migrations of this size are won on repeatable process, and that process is built into the platform.
6
European sovereignty
Teldat is a European manufacturer with CPSTIC certification at ENS Alta level and the Cybersecurity Made in Europe label. WAN policies, telemetry and management data stay under EU jurisdiction, a requirement that matters increasingly in public sector and regulated industry migrations away from legacy carrier services.

Migration without a platform bet: the riskiest part of leaving MPLS is usually not the circuits, it is committing to an overlay platform before knowing how the network behaves on internet transports. The Teldat approach removes that bet. Deploy the CNM SD-WAN Suite over the MPLS you already have, gather real per application telemetry, and make every circuit decision afterwards with evidence. The platform, the policies and the security stack stay identical from the first hybrid site to the last full internet one.

Frequently asked questions about SD-WAN vs MPLS

❯ What is the difference between SD-WAN and MPLS?

MPLS is a carrier transport service: a private circuit with engineered paths and contractual SLAs, priced at a premium per megabit. SD-WAN is a software overlay that runs on edge devices and steers application traffic across any mix of transports (broadband, fiber, 4G/5G, and MPLS itself) based on real time path quality. They operate at different layers, which is why an SD-WAN can use an MPLS circuit as one of its transports during and after a migration.

❯ Is SD-WAN cheaper than MPLS?

Per megabit, yes, usually by a factor of 3 to 10, because SD-WAN rides commodity broadband and FWA instead of engineered private circuits. The full picture includes the edge devices and licenses SD-WAN adds, and the branch firewalls, VPN concentrators and proxies it removes. Most enterprises end up with several times more bandwidth at flat or lower total WAN spend after migrating.

❯ Does SD-WAN replace MPLS completely?

It can, but it does not have to. Many enterprises keep a reduced MPLS footprint at sites with strict latency requirements toward private data centers, while all other sites run on internet and 5G FWA transports. SD-WAN manages both kinds of sites in one overlay with the same policies, so the MPLS question becomes a per site economics decision rather than an architecture decision.

❯ When should a company migrate from MPLS to SD-WAN?

The strongest migration signals are: most traffic going to cloud and SaaS rather than to a private data center, MPLS contracts approaching renewal, sites waiting weeks for circuit provisioning, and WAN costs limiting the bandwidth the business needs. The cleanest approach migrates in waves aligned with circuit renewal dates, using telemetry from early waves to validate the harder sites.

❯ Is SD-WAN as reliable as MPLS?

Differently reliable. MPLS reliability comes from a carrier SLA on a single engineered circuit. SD-WAN reliability comes from architecture: two or more diverse transports with sub second failover, FEC and packet duplication for sensitive applications. A site with broadband plus 5G FWA under SD-WAN routinely achieves higher measured availability than a single MPLS circuit, because the two paths fail for unrelated reasons.

❯ How does Teldat support MPLS to SD-WAN migration?

The Teldat CNM SD-WAN Suite runs MPLS, internet and 4G/5G FWA as equal transports in one overlay, so migration can start on existing circuits and move to internet transports per site, in waves, with no platform change. Zero Touch Provisioning activates sites in minutes, embedded NGFW and be.Safe Pro SSE secure local breakout from day one, and CNM Visualizer provides the per application telemetry that drives each circuit decision with evidence.

Plan your MPLS to SD-WAN migration with Teldat

The CNM SD-WAN Suite runs MPLS, internet and 5G FWA as equal transports, with embedded NGFW, be.Safe Pro SSE and per application telemetry to guide every circuit decision. Proven at 2,700 sites in Europe’s largest SD-WAN and XDR deployment.