SD-WAN (software-defined wide-area networking) is a way to centrally manage how traffic between offices, data centers, and cloud services uses available network links. Software-based policies operate over an overlay, while the underlying connections—the underlay—may include broadband internet, MPLS, LTE, satellite, or other transports. SD-WAN is not itself a circuit type, and adopting it does not require removing MPLS.
What is SD-WAN?
SD-WAN applies software-based policy and centralized network control to a wide-area network overlay. At a high level, it lets an organization define how different traffic should move between locations and then use available underlay connections to carry it.
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MEF describes an SD-WAN service in terms of applying policy to incoming IP packets, classifying application flows, and forwarding them over configured underlay connectivity. Cisco’s overview likewise describes virtualization, application-level policies, and overlay networks. These descriptions support the general concept; individual platforms may use different components, terminology, and capabilities. MEF’s SD-WAN overview and Cisco’s SD-WAN overview provide further context.
Two terms clarify the model:
- Overlay: The logical network and policies that coordinate traffic across sites.
- Underlay: The physical or service-provider connections that actually carry packets, such as internet broadband, MPLS, or cellular service.
An SD-WAN edge function connects a site to the service and forwards its traffic. The edge may be implemented in physical equipment or software, depending on the platform and deployment. Cisco’s overview and Cisco’s getting-started guide describe edge functions in their respective contexts.
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How does SD-WAN work?
In a typical design, site edges connect to one or more underlay links. Policy classifies traffic and influences its forwarding path, while management and control functions coordinate configuration and network behavior. The exact architecture and names vary by vendor.
- Connect site edges. An edge at an office or other subscriber location links the SD-WAN service to the available underlay connections.
- Make underlay links available. Sites may use combinations of MPLS, broadband, LTE, satellite such as VSAT, or other transports. These links can differ in performance, route, and security characteristics.
- Classify traffic and apply policy. The service can classify IP traffic into application flows and apply configured forwarding policy to those flows. A policy might, for example, direct different application traffic over different available paths; actual behavior depends on the platform, configuration, and link conditions.
- Coordinate and forward. Central management and control functions help configure and coordinate the network; edge data-plane functions forward packets. Their division and implementation are platform-specific.
Cisco Catalyst SD-WAN as one implementation example
Cisco’s terminology illustrates how a vendor may divide these functions: its Validator assists onboarding and connectivity orchestration; its Manager provides central management; its Controller handles control-plane functions; and edge devices forward site traffic. Cisco describes those roles in its Catalyst SD-WAN getting-started guide. These names and roles are Cisco-specific, not a required architecture for every SD-WAN product.
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Why organizations use SD-WAN
For organizations with many offices, data centers, and cloud applications, SD-WAN can make network policy and operations more centralized. Rather than treating every site as an isolated routing problem, teams can manage configurations and monitoring across locations and use application-aware policies across available links.
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Designs may combine MPLS and broadband, use multiple transports actively, provide direct internet access at branches, or connect sites to public cloud environments. Cisco’s design guide describes these capabilities, along with application visibility and transport-independent overlays. It also presents shifting traffic to lower-cost links as a possible efficiency benefit—not a guaranteed saving. See the Cisco Catalyst SD-WAN design guide and Cisco’s overview.
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The results depend on the organization’s topology, application traffic, available link quality, policies, service-provider options, security controls, and operating costs. SD-WAN does not by itself guarantee lower costs, faster applications, or higher availability.
SD-WAN vs. MPLS: what is the difference?
SD-WAN and MPLS are not direct substitutes in the same category. SD-WAN is an overlay and policy approach; MPLS is one possible underlay transport. An SD-WAN design can use MPLS alone or alongside broadband, LTE, or other available connections.
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| Decision area | What to evaluate |
|---|---|
| Transport flexibility | Whether the design uses a single private transport or a mix of MPLS, broadband, LTE, and other available links. |
| Application policy and visibility | Whether the platform classifies application traffic and supports path policies aligned with the organization’s objectives. |
| Operations | Whether centralized provisioning, monitoring, and changes fit the operating model better than managing locations and devices individually. |
| Cloud and internet access | How branch traffic reaches SaaS, public cloud environments, and the public internet. |
| Security architecture | Which authentication, encryption, segmentation, and firewall controls are available, how they are configured, and who is responsible for them. |
| Resilience and cost | Actual circuit costs, service levels, failure behavior, bandwidth, and management costs for the proposed design. |
The right comparison is between complete designs and services, not between the labels “SD-WAN” and “MPLS.” A mixed design may keep MPLS for some traffic while adding other transports and applying centralized policies. Cost and performance claims should be tested against the specific circuits, applications, service levels, and operating costs in question; the available sources establish design options, not a universal savings percentage or performance result.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIs SD-WAN secure?
The SD-WAN label alone does not establish that a network is secure. Security depends on the selected platform, its configuration, the underlay, and how responsibilities are divided between the organization and providers.
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Cisco describes mutual authentication, authorization, and encryption in its implementation, and its design guide discusses segmentation and other security features. Treat these as Cisco-specific descriptions, not guarantees that every SD-WAN product includes identical controls. Evaluate the selected deployment’s authentication, encryption, segmentation, firewalling, and access policies. See the Cisco SD-WAN solution white paper and Cisco design guide.
What to verify before choosing a deployment
Capabilities can vary by platform and software release. Cisco’s cited design guide is based on SD-WAN Manager version 20.6 and below; it directs planners to verify support and release notes. For any deployment, check current product documentation rather than assuming a guide or feature list applies to the release under consideration.
- Compatibility of the chosen hardware or virtual edge with the intended platform and software release.
- Throughput and capacity under the traffic and security features the deployment will use.
- Software lifecycle, licensing, and support requirements.
- Controller placement and the design’s behavior when a link, site, or control component fails.
- Security architecture, configuration, and responsibility boundaries.
- The complete cost and service-level picture for links, management, and operations.
An SD-WAN router or edge router is one possible physical component, but a generic router alone does not establish that it provides SD-WAN functionality. Cisco’s documentation describes edge devices as physical or virtual and assigns them site traffic functions. Confirm model and platform compatibility against the chosen deployment’s requirements in the Cisco getting-started guide.
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