Should You Replace MPLS? A Framework for Making the Decision
US Signal |
Every network team eventually asks the same question: is MPLS still the right call, or is it time to move on? The honest answer is that it depends, on your compliance obligations, your growth pattern, your workload mix, and how much your infrastructure needs to flex. This post lays out the actual decision criteria, so you can answer it for your organization instead of taking a vendor’s word for it.
This isn’t a fringe question anymore. According to TeleGeography’s 2024 WAN Manager Survey, roughly 90% of enterprises were already using SD-WAN or actively in the process of adopting it, meaning the decision most network teams now face isn’t “if” but “how much, and for which sites.”
Why This Decision Is Harder Than “MPLS vs. SD-WAN”
MPLS and SD-WAN solve the same core problem, connecting multiple sites reliably, but they do it in fundamentally different ways. MPLS runs over ISP-owned, purpose-built circuits, which means changes require real network-engineering effort and upfront investment is high, but performance is predictable because the path is dedicated. SD-WAN builds encrypted tunnels over commodity internet connections, which is far more flexible and cost-efficient, but it inherits the variability of the public internet it rides on.
Neither is categorically better. The right choice depends on which tradeoffs match your environment. Here’s how to work through it.
When MPLS Still Makes Sense
You need guaranteed, low-variance latency. If you’re running real-time voice, video conferencing at scale, or industrial control systems where a few milliseconds of jitter causes real problems, MPLS’s dedicated-circuit model still has an edge. SD-WAN has closed much of this gap, but for the most latency-sensitive workloads, a private circuit removes a variable you don’t want to manage.
You operate in a compliance environment that assumes private circuits. Some regulatory or contractual frameworks, particularly in finance, healthcare, and government, were written with dedicated, auditable network paths in mind. If your compliance posture is built around that architecture, ripping it out isn’t just a technical project; it’s a compliance re-certification project. That’s not a reason to never change, but it is a reason to plan the change deliberately rather than reactively.
Your site count is small and stable. MPLS’s biggest cost disadvantage shows up when you’re adding sites, adjusting bandwidth, or restructuring often, since each change requires provider involvement and lead time. If you’re running a handful of stable locations with no expansion plans, that disadvantage barely surfaces. You may simply not have the volume of change that makes MPLS’s rigidity expensive.
You’re mid-contract with sunk cost that outweighs urgency. If you’re two years into a five-year MPLS agreement with no acute pain, the math on switching early rarely works out. This is a legitimate reason to wait, not a reason to avoid planning for the eventual switch.
When SD-WAN or SASE Is the Right Move
You’re adding, closing, or changing sites regularly. This is the single clearest signal. Every MPLS change, a new site, a bandwidth bump, a reconfiguration, requires provider lead time and engineering effort. SD-WAN changes happen largely in software. If your organization grows through acquisition, opens new locations, or restructures more than once every few years, this alone often justifies the move.
Your workloads are cloud-first or multi-cloud. MPLS was built for a hub-and-spoke world where traffic flowed back to a central data center. If a meaningful share of your traffic is now going to SaaS applications or public cloud environments, routing it through a private circuit back to headquarters first is often a detour, sometimes a costly one in both time and performance.
You have a distributed or hybrid workforce. MPLS connects sites. It doesn’t natively extend to remote workers or branch offices that pop up and disappear. SD-WAN, especially paired with SASE, extends consistent policy and secure access to users wherever they are, without provisioning new circuits every time your footprint changes.
Budget flexibility matters more than absolute performance guarantees. SD-WAN rides commodity internet connections, which cost less and come with more purchasing options than provider-owned MPLS circuits. If your organization needs to convert fixed infrastructure spend into more variable, scalable spend, that’s a structural advantage, not a marginal one.
When a Hybrid Approach Is the Real Answer
Most organizations don’t fit neatly into “replace everything” or “change nothing.” A hybrid approach, keeping MPLS for a subset of latency-critical or compliance-bound sites while moving the rest to SD-WAN, is often the pragmatic middle path. This lets you:
- Protect the workloads where guaranteed performance is non-negotiable
- Capture cost and flexibility gains everywhere else
- Migrate on your own timeline instead of an all-or-nothing cutover
- Test SD-WAN’s performance in your actual environment before committing fully
Hybrid isn’t indecision. It’s often the most defensible architecture for organizations with mixed workload requirements.
A Simple Decision Framework
Walk through these questions in order. Where you land tells you which path fits.
- Do any of your workloads require guaranteed sub-10ms jitter or are they subject to compliance rules that mandate private circuits?
If yes for a meaningful share of traffic → keep MPLS for those workloads specifically, evaluate SD-WAN for the rest. - How often are you adding, closing, or reconfiguring sites?
Multiple times a year → SD-WAN’s flexibility advantage is significant.
Once every few years or less → MPLS’s rigidity costs you less than you’d think. - What share of your traffic is going to SaaS or public cloud versus back to a central data center?
Majority cloud-bound → MPLS’s hub-and-spoke design is working against you.
Majority data-center-bound → less urgency to change. - Where are you in your current contract term?
Near renewal → this is your natural decision point.
Deep in a multi-year term with no acute pain → plan the transition, don’t force it early. - Does your workforce include remote or hybrid employees who need secure, policy-consistent access?
Yes → SD-WAN/SASE extends your architecture to them natively; MPLS doesn’t.
If most of your answers point toward flexibility, growth, and cloud-first traffic, SD-WAN or SASE is likely your direction. If your answers cluster around latency guarantees and compliance lock-in, MPLS still has a job to do, possibly alongside SD-WAN for everything else.
The Bottom Line
There’s no universal right answer to should you replace MPLS, and any vendor telling you there is one is selling, not advising. The right infrastructure decision comes from matching your actual workload requirements, growth pattern, and compliance obligations to the technology built for them: sometimes that’s MPLS, sometimes SD-WAN, and often it’s both running side by side.
If you’re working through this decision and want a second set of eyes on your specific environment, US Signal’s team can walk through the tradeoffs with you, no pressure toward a predetermined answer.
*Disclaimer: This post was created with the assistance of AI.
