SD-WAN vs MPLS

What is MPLS? What is SD-WAN? 2026 definitions

MPLS (Multiprotocol Label Switching) is a private wide-area network service you rent from a carrier. Your traffic rides the carrier's backbone with labels that keep it isolated from the public internet and prioritized end to end. The carrier commits to hard numbers in the contract: typically sub-5ms jitter and under 0.1 percent packet loss between your sites. That determinism is what you are paying for, and in 2026 it still costs roughly $50 to $100 per Mbps per month in the US mid-market. A 100 Mbps MPLS circuit commonly runs $1,500 to $3,000 per site per month.

SD-WAN (Software-Defined Wide Area Network) is an overlay, not a circuit. Edge appliances at each site build encrypted tunnels across whatever transport you give them: dedicated internet access (DIA), cable broadband, fiber, LTE or 5G. Software measures every path continuously and steers each application over the best one in real time. Voice can ride the low-jitter path while backups ride the cheap one. When a circuit degrades or fails, traffic moves in under a second.

Two forces define the 2026 version of this decision. First, SASE convergence: Gartner projects that 60 percent of new SD-WAN purchases this year are part of a single-vendor SASE offering, up from 15 percent in 2022, so the WAN decision and the security decision are now the same conversation. Second, the copper sunset: carriers are actively decommissioning copper-fed circuits and repricing the stragglers, in some documented cases up to 10x. If your MPLS runs on legacy copper, your renewal is not going to look like your last invoice.

Architecture: how the two networks actually move traffic

The clearest way to see the difference is to follow one packet from a branch office to Microsoft 365.

On MPLS, the branch has one private circuit to the carrier cloud. Internet-bound traffic usually cannot exit locally; it hauls back to your headquarters or data center, passes through the central firewall stack, and only then reaches Microsoft. That backhaul adds a measurable 15 to 40ms of latency to every cloud session, and it turns your head-end circuit into a chokepoint that you upgrade at MPLS prices.

On SD-WAN, the same branch has two diverse paths, for example a 200 Mbps DIA fiber circuit and a cable or 5G backup. The edge device recognizes the Microsoft 365 session and hands it directly to the closest Microsoft front door over the local internet. Site-to-site traffic rides encrypted tunnels across whichever path is currently performing best. There is no head-end chokepoint, and adding a tenth or fiftieth site does not mean re-engineering a hub.

Two design notes matter here. Diverse means genuinely diverse: two circuits from the same provider sharing one conduit fail together, so the second path should come from a different carrier over different physical infrastructure, with 5G as a clean third option. And during a migration, MPLS itself can serve as one of the paths; the overlay treats it like any other transport, which is what makes a phased, zero-downtime exit possible.

Performance comparison

Cost comparison: CapEx, OpEx, and a real 3-year TCO

What MPLS really costs in 2026 (US mid-market ranges)

• Circuits: $50 to $100 per Mbps per month; a 100 Mbps circuit at $1,500 to $3,000 per site
• Change orders: adding bandwidth or a site is a 60 to 90 day carrier project, quoted at MPLS rates
• Hidden line items: copper-sunset repricing on legacy circuits (documented cases up to 10x), the 15 to 40ms cloud backhaul tax you pay in productivity rather than dollars, and head-end bandwidth upgrades forced by traffic that never needed to hairpin in the first place

What SD-WAN really costs in 2026

• Licenses and orchestration: $100 to $300 per site per month; $500 to $1,000 and up with integrated security bundles; $75 to $150 at volume
• Underlay: DIA at roughly $5 per Mbps (a 100 Mbps DIA circuit around $500 per month), plus a $50 to $150 broadband or 5G second path
• Edge hardware, one time: $500 to $2,000 small office, $1,500 to $5,000 branch, $5,000 to $12,000 high-capacity
• Co-managed or fully managed service: $125 to $375 per site per month depending on scope

Per site, per month at a glance

Sample 3-year TCO: 10-site mid-market company (100 to 200 Mbps per site)

That works out to roughly 35 percent savings, comfortably inside the 30 to 50 percent range businesses commonly see, while buying two circuits per site instead of one and multiplying usable bandwidth. Treat every number above as a range for a reason: exact pricing is street-address specific, distance and loop dependent, and heavily contract dependent. Two buildings a mile apart can quote 40 percent differently. This is exactly the modeling ObsidianX does against your actual invoices before you sign anything. If you want a quick checklist before that full review, run the free 5-sign telecom checklist against your current circuits.

Use-case decision matrix: MPLS, SD-WAN, or hybrid

Security and SASE readiness

MPLS is private, but private is not secure. Traffic is unencrypted by default, there is no traffic inspection built in, and a private circuit does nothing about the majority of traffic that now terminates on the internet anyway.

SD-WAN encrypts every tunnel by default and, more importantly, is the on-ramp to SASE: cloud-delivered firewall, secure web gateway, and zero trust network access applied consistently to every site and remote user. This is where the market has moved. Gartner projects 60 percent of new SD-WAN purchases in 2026 are part of a single-vendor SASE offering, and 67 percent of enterprises plan to integrate SD-WAN with SASE capabilities by the end of the year.

One vendor-neutral caution: single-vendor SASE is operationally simpler, but it concentrates your network and your security in one contract. Sometimes that is right. Sometimes a best-of-breed pairing wins on capability or price. This is a supplier-selection problem, and it deserves a competitive process rather than a default.

How we run cybersecurity evaluations

Migration guide: MPLS to SD-WAN without downtime

What actually works, from RFPs and cutovers we have run:

1. 1.Inventory circuits and contracts first. Pull every circuit ID, term end date, and early termination fee before you evaluate a single vendor. ETF overlap is the most common source of double-paying, and renewal auto-extensions are the second.
2. 2.Order internet underlay early. DIA installs run 45 to 90 days in most US metros. This is the long pole; start it the week the project is approved.
3. 3.Deploy SD-WAN as an overlay on the MPLS you already have. The edge devices treat MPLS as just another path. You get central visibility and app-aware routing on day one with zero risk to production traffic.
4. 4.Dual-run and test per application. Steer low-risk traffic to internet paths first. Define pass criteria before cutover: for voice, hold jitter under 10ms and loss under 0.5 percent across a two-week window before moving the next tier.
5. 5.Cut over in branch waves. Groups of 3 to 5 sites per wave, with a defined rollback: re-steer to MPLS in minutes if a wave misbehaves.
6. 6.Disconnect MPLS on contract boundaries, not project boundaries. Time disconnects to term end dates. Where a term runs long, keep the circuit as a paid-for backup path until it expires.
7. 7.Update the IP-dependent plumbing before each cutover. New circuits mean new public IPs: refresh firewall rules, SaaS and banking allowlists, site-to-site VPN peers, and lower DNS TTLs a week ahead so the swing is invisible to users.
8. 8.Instrument day-2 operations. Per-path jitter, loss, and utilization dashboards per site. SD-WAN gives you the telemetry MPLS never did; use it.

Real-world example: 10 sites, 100+ cameras, $18,113.76 a year back

HomeBoy Industries, the Los Angeles non-profit and social enterprise, ran 10 locations serving over 10,000 individuals annually. Nine of the ten sites sat on single circuits with no failover. The Atlantic Avenue facility alone operated 100+ IP security cameras requiring 200 to 400 Mbps of sustained upload, on infrastructure never designed for it, and the legacy WAN included $1,100 per month of EPL and Metro-E circuits doing work commodity internet could do.

Working with our partner Circle MSP, ObsidianX designed and deployed a VeloCloud SD-WAN across all 10 locations: 1 Gbps dual-DIA at the site with heavy camera traffic, diverse circuits at every location, and application-aware failover so camera streams, VoIP, and case-management systems each get the path they need. Every circuit consolidated to a single invoice.

The result: $1,509.48 per month in total savings, $18,113.76 per year, with payback in roughly two months, and 100 percent camera uptime protection at the site where evidence-grade video cannot drop. "ObsidianX found savings we did not know existed and gave every site a network that just works," said Omar Rahmat of Office Technology Partners.

Read the full HomeBoy Industries case studyChoosing a platform? Cisco SD-WAN vs the 6 best alternatives