Dmitry Nikolaev -


What does open source SD-WAN look like, and do we need it?

Open source software has an openly available source code that users can adopt or modify. Open source combined with SD-WAN might be a perfect match or a too idealistic goal.

Today's software-defined WAN, or SD-WAN, offerings already use open source building blocks in their underlying architectures. The adoption of open source in SD-WAN occurred primarily because the SD-WAN market already accepted many underlying open source components, and vendors were focused on time to market -- or the amount of time between developing and selling a product -- for this surging product category.

However, when users visualize a full open source SD-WAN product, they envision a top-to-bottom open source stack that enables a business to fulfill all its WAN management and orchestration needs in a single, open product. The holy grail of any open source SD-WAN vision is heterogeneous WAN endpoints: In this idealized situation, any endpoint could seamlessly communicate with any other endpoint regardless of the vendor or version. Yet, in practicality, this is not what most customers need from their SD-WAN.

SD-WAN is a virtual overlay to traditional WAN circuits. Instead of the conventional, static WAN configuration through command lines and scripts, SD-WAN enables a more fluid configuration that traffic, events and other outside stimuli can dynamically change. But SD-WAN needs control over both WAN endpoints to achieve this higher capability level.

Could an open source SD-WAN work?

The special sauce that today's SD-WAN vendors provide is highly dependent on having the right hooks into the underlying architecture. To take this a step further, some SD-WAN vendors may prefer having specific endpoint control to enable optimal performance of their services. Vendors may be unlikely to release unique features as open source because that gives competitors access to their differentiating capabilities.

open source network
These open source pros and cons for network monitoring also apply to open source SD-WAN. The software may be easily customizable and compatible with various tools, yet it also has unique challenges.

Therein lies the challenge: To make a successful open source SD-WAN, one needs to reduce the technology to its lowest common denominators. But this strategy goes against what customers are demanding from SD-WANs. The most successful products have a clear and almost proprietary advantage over the rest of the rapidly expanding competitor field through their unique feature sets.

At this point, much of the market consolidation has already occurred, as key SD-WAN providers were consumed through acquisitions. Now is the time for the largest players to slug it out for market share as SD-WAN becomes the de facto mechanism for branch office automation.

This was last published in July 2019

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How could open source software affect your organization's SD-WAN plans?