You don't have to choose between open and proprietary anymore
For decades, the freedom to run deeply customizable networking software was a privilege reserved for the giants of the cloud — Amazon, Google, Meta — who had the scale to demand it. Now Cisco is extending that same freedom to ordinary enterprises, bringing SONiC, the open-source network operating system born inside Microsoft's Azure infrastructure, to its flagship Nexus 9000 datacenter switches. The move arrives at a moment when on-premises AI is reshaping what companies need from their infrastructure, and when the long-standing divide between hyperscaler capability and enterprise reality is quietly beginning to close.
- Enterprises running AI and machine learning workloads on-premises have been locked out of the flexible, customizable networking stacks that cloud giants have long taken for granted — and that gap is now becoming a competitive liability.
- Cisco's quiet blog post announcement signals a meaningful pivot: SONiC, once confined to router support, is coming to the N9000 switch line that powers the heart of enterprise datacenters.
- The real disruption isn't the software itself — it's that customers can run SONiC and Cisco's proprietary NX-OS on the same hardware simultaneously, eliminating the forced choice between innovation and stability.
- Cisco is hardening SONiC with enterprise-grade support, security testing, and integration into its Nexus Dashboard management tools, transforming an open-source project into a production-ready option backed by a trusted vendor.
- The trajectory points toward a narrowing of the capability gap between hyperscalers and everyone else, with Cisco positioning itself as the trusted bridge between open networking's promise and enterprise risk tolerance.
Cisco is preparing to let enterprise customers run SONiC — the open-source network operating system that began as Microsoft's internal Azure Cloud Switch software and became a cornerstone of hyperscaler infrastructure — on its Nexus 9000 datacenter switches. Until now, that kind of deep networking flexibility has been the exclusive domain of companies like Amazon, Google, and Meta, who have the engineering scale to demand customizable stacks from their hardware vendors.
The shift matters because the landscape has changed. Hyperscalers are now running SONiC to power their AI services, and a growing number of enterprises — constrained by data sovereignty rules, regulatory requirements, or simple preference — need to run similar AI workloads on their own hardware. SONiC on standard datacenter switches suddenly looks like a practical answer to a pressing problem.
Cisco signaled the move in a carefully worded blog post describing the N9000 as gaining a SONiC foundation built on Cisco's own silicon, alongside NVIDIA Spectrum-X platforms for AI-focused network fabrics. A company spokesperson confirmed to The Register that general availability on the N9000 line is coming soon.
The most consequential detail is that customers won't have to choose between old and new. SONiC and Cisco's proprietary NX-OS can run on the same hardware, in the same datacenter, at the same time. Enterprises can protect existing Application Centric Infrastructure investments while standing up SONiC for new AI clusters — no rip-and-replace required. Cisco will harden the stack, back it with its Technical Assistance Center, and integrate it with Nexus Dashboard for familiar management tooling.
What's unfolding is less a product announcement than a quiet rebalancing of power in enterprise networking — a signal that the flexibility once reserved for the world's largest cloud operators is becoming available to anyone willing to pay for it from a vendor they already trust.
Cisco is about to let its enterprise customers do something that, until now, has mostly been the province of the hyperscalers: run SONiC, the open-source network operating system, on their flagship Nexus 9000 datacenter switches.
SONiC stands for Software for Open Networking in the Cloud. It's a Linux Foundation project that began as Microsoft's adaptation of its own Debian-based Azure Cloud Switch software. The operating system is designed to run on many different kinds of switches and silicon, which is precisely why the big cloud companies—Amazon, Google, Meta, and others—have embraced it. They need networking stacks they can customize deeply, and SONiC gives them that freedom. Cisco, Juniper, and Arista all support it because these hyperscalers buy enormous quantities of their hardware.
For years, the question hanging over SONiC was whether it would ever break out of the hyperscaler world. Dell made the case that it should, arguing that enterprises would benefit from the same flexibility and choice that cloud giants enjoy. The theory was elegant: if SONiC ran on hardware from multiple vendors, customers could build diverse fleets instead of locking themselves into a single supplier. That hasn't really happened at scale. But the calculus has shifted. Hyperscalers are now using SONiC to power the networks that run their AI services. And many organizations—for reasons ranging from data sovereignty to regulatory requirements to simple preference—cannot or will not run AI workloads in the cloud. For those companies, SONiC on ordinary datacenter hardware suddenly looks like a timely solution.
Cisco has supported SONiC on its routers for some time. Last week, the company quietly signaled that it will soon extend that support to the N9000 series, its workhorse datacenter switch line. The announcement came in a blog post that described the N9000 as expanding to include "a foundation for SONiC, built on Cisco Cloud Scale and Silicon One," alongside platforms using NVIDIA Spectrum-X Ethernet switch silicon for AI-focused fabrics. The language was careful and measured, but the implication was clear: Cisco is preparing to make SONiC generally available on these switches.
What matters here is not just that SONiC will run on the N9000, but how Cisco is positioning it. The company will harden the SONiC stack—meaning they'll test it, secure it, and make it production-ready. They'll back it with their Technical Assistance Center, the same support organization that handles their proprietary systems. They'll integrate it with Nexus Dashboard, Cisco's management platform, so customers get the familiar tools they're used to for automated deployment and health monitoring. And crucially, customers will be able to run SONiC and Cisco's proprietary NX-OS operating system on the same hardware, in the same datacenter, at the same time.
That last detail is the real news. It means enterprises don't have to choose. They can keep their existing Application Centric Infrastructure setups running on NX-OS while experimenting with SONiC for new AI or machine learning clusters. They protect their existing investments. They simplify lifecycle management. They get optionality without rip-and-replace risk. A Cisco spokesperson confirmed to The Register that the blog post amounts to an announcement that SONiC support will soon become generally available on the N9000 line.
What's happening here is a quiet but significant shift in how enterprise networking works. For a long time, the gap between what hyperscalers could do and what ordinary companies could do was vast. Hyperscalers had the scale, the engineering resources, and the leverage to demand open, customizable systems. Everyone else bought what the vendors sold them. Now, as on-premises AI becomes more common and as enterprises demand more control over their infrastructure, that gap is closing. Cisco is betting that its customers want the same flexibility the cloud giants have always had—and that they'll pay for the privilege of getting it from a vendor they already trust.
Citas Notables
Our open choice model will extend this flexibility to the N9000, giving customers the future option to run SONiC for AI or non-AI clusters, while maintaining their existing Application Centric Infrastructure or NX-OS environments on the same proven hardware.— Cisco (via blog post)
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that Cisco is doing this now, specifically? SONiC has existed for years.
Because the use case has changed. Hyperscalers needed SONiC for customization and cost control. But now enterprises are running AI workloads on-premises, and they need the same kind of flexibility. Cisco is recognizing that demand.
But couldn't enterprises just buy switches from other vendors that already support SONiC?
They could, but there's friction. Cisco has installed base, relationships, support infrastructure. By offering SONiC on the N9000, Cisco is saying: you don't have to leave us to get what you want.
What does "hardening" the stack actually mean in practical terms?
It means Cisco is taking the open-source SONiC code and testing it, securing it, making sure it works reliably on their hardware. Then they're putting their support team behind it. That's not trivial—it's the difference between a project and a product.
So a customer could run SONiC on some switches and NX-OS on others in the same datacenter?
Exactly. Same hardware platform, different operating systems. You're not forced to migrate everything at once. You can experiment with SONiC on new workloads while keeping your existing infrastructure stable.
Is this a threat to Cisco's proprietary business?
On the surface, maybe. But Cisco is betting that by offering choice, they keep customers from leaving entirely. It's a defensive move dressed up as openness.
What happens next?
Watch for the general availability announcement and the pricing model. That will tell you whether Cisco is serious about this or just managing perception.