What is SD-WAN and how does it improve connectivity?

Short answer

SD-WAN (Software-Defined Wide Area Network) uses software-based controllers to manage WAN connections dynamically. It combines multiple transport types like MPLS, broadband, and LTE for cost-effective, resilient connectivity.

How it works

A centralized controller defines policies that dictate how traffic flows across available links. The SD-WAN edge appliance monitors link quality in real time and routes critical application traffic over the best path. If one link fails, traffic fails over automatically.

Example

A retail chain uses SD-WAN to send point-of-sale data over a secure MPLS link while routing guest Wi-Fi traffic over cheaper broadband. During a primary link outage, SD-WAN shifts POS traffic to a 4G LTE backup without manual intervention.

Why it matters

SD-WAN reduces reliance on expensive MPLS circuits, improves application performance through intelligent routing, and simplifies management across hundreds of branches from a single dashboard.