Open-source, commercial, or both? Choosing a network automation stack

The "open-source vs. commercial" debate is one of the most common questions we get — and usually the wrong first question. The tool is downstream of the outcome. Decide what capability you need, layer by layer, and the right mix of open-source and commercial tends to fall out on its own.

There is no single "network automation platform" that does everything well. A working stack is a set of layers, each solving a different problem. Choosing well means making a deliberate call at each layer rather than picking one vendor and forcing everything into it — or, at the other extreme, assembling so many open-source pieces that integration becomes the full-time job.

Think in layers, not products

A network automation stack usually breaks down like this:

• Source of truth — the authoritative record of intended state.
• Config & automation engine — the layer that pushes and enforces device configuration.
• Orchestration — service-level, multi-device, transactional intent.
• Observability — monitoring, metrics, and telemetry.
• Analytics & AIOps — correlation, anomaly detection, and closed-loop logic.
• Integration & ITSM — the glue into service management and the wider business.

Each layer is a separate buy-build-or-open-source decision, driven by the same handful of factors: scale, in-house skills, support requirements, total cost of ownership, appetite for lock-in, and whether this layer is a source of differentiation for you or just table stakes.

When open-source wins

Open-source shines where you have — or want to build — engineering capability, and where flexibility and cost matter more than a support contract. Tools like NetBox for source of truth, Ansible for configuration, and Zabbix, Prometheus and Grafana for observability are mature, widely deployed, and community-backed. They give you control, no per-node licensing surprises, and no vendor gatekeeping your data.

The trade is real, though: open-source assumes you can integrate, operate and support it. That capability is an asset — but it has to actually exist on the team, or be brought in.

When commercial wins

Commercial platforms earn their license cost where scale, multi-vendor service complexity, vendor support and speed-to-value dominate. Cisco NSO and Crosswork for large, model-driven, multi-vendor service orchestration; NetBrain for no-code automation and dynamic mapping — these solve hard problems with a support line behind them and a faster path to production than building equivalent capability yourself.

"Both" is the normal answer

In practice, most healthy stacks are hybrids. A very common and effective shape:

1. NetBox as the open-source source of truth at the center.
2. Ansible for day-to-day configuration automation and glue.
3. Zabbix / Grafana for monitoring and visualization.
4. Cisco NSO where service-level, transactional, multi-vendor orchestration is needed.

The value isn't in any one of these — it's in integrating them into one coherent operation, with the source of truth feeding everything else.

Protecting yourself from lock-in

Whatever mix you choose, a few principles keep you free to change your mind later:

• Keep the source of truth vendor-neutral. Your data model is the one thing you should never rent from a single vendor.
• Insist on APIs and standards — YANG, OpenConfig, gNMI, NETCONF/RESTCONF — so components are replaceable, not welded together.
• Own the integration layer. The glue between tools is where lock-in quietly accumulates; keep it in your control.
• Prefer data you can export. If you can't get your state out cleanly, you don't really own it.

How we approach it at TAMAKUN

We're vendor-independent by principle. We don't start with a product we're trying to sell — we start with your environment, your team's capabilities, and the outcome you're after, then choose the right tool for each layer, commercial or open-source, and integrate them into one operation you're free to evolve. The best stack is the one that fits you and doesn't trap you.