Open-Networking on Brett's Blog

SONiC at the Edge: Cheaper Switches Don't Mean a Cheaper Network

brett@network-notes.com (Brett Lykins) — Wed, 08 Apr 2026 10:00:00 -0500

Disclosure: I currently work on a team deploying SONiC at scale. I’m not a neutral party, but I’ll be honest about both sides of the ledger.

In Part 1, I covered the technical shift: 1G access-layer hardware now runs SONiC, the feature set is filling in, and the support ecosystem is real. If you haven’t read that yet, start there.

This post is about the question that comes after “can we?” — the “should we?” That answer has less to do with switch specs and more to do with how your organization spends money, builds teams, and tolerates risk.

The Capex-Only Trap

Everyone leads with hardware savings when pitching disaggregated networking. And the savings are real. White box switches commonly cost one-half to one-third what a comparable Cisco Catalyst or Arista switch runs, based on list-price comparisons across current 48-port 1G PoE models. At fleet scale, that delta gets attention from finance teams fast.

But hardware is the easiest line item to compare and often the smallest. One TCO analysis of a 15,000-device deployment found that purchase price represented only 25–30% of five-year costs, with the remaining 70–75% coming from deployment, management, support, and retirement. Network infrastructure tends to follow a similar pattern, though the exact ratio varies by environment. One analysis on the Network Automation Forum captured this well: an engineer cited potential savings of $1.3 million on a single edge upgrade, while others in the same discussion pointed out that compensating costs in staffing and operational complexity can eat into those numbers significantly.

Here’s what actually costs money over five years:

Staffing. Someone has to operate this network. SONiC is Linux. Your team needs to be comfortable with Debian, systemd, Docker containers, and debugging at the OS level, not just CLI-driven NOS administration. If your current team can’t do that, you’re either retraining them or hiring people who can. Both cost money.
Training. Retraining a team that’s spent a decade on IOS or EOS is a real investment. It’s not a week-long bootcamp. It’s months of building muscle memory on a fundamentally different operational model.
Tooling and management plane. Your existing monitoring, config management, and automation probably assumes a traditional NOS. Some of it ports over. Some of it gets rebuilt. That rebuild has a cost in engineering hours and in the operational risk of running new tooling in production. The bigger gap: SONiC doesn’t ship with a CloudVision or DNA Center equivalent. There’s no turnkey management plane for ZTP, firmware lifecycle, config compliance, or centralized visibility. Organizations with the scale to justify SONiC have often already built internal tooling for these functions and aren’t relying on vendor-provided platforms, which lowers this cost significantly. But if your operations today depend on a vendor management suite, budget for the engineering effort to replace it.
Wireless and adjacent systems. SONiC is a wired switching NOS. You’ll need a separate wireless management stack, which adds another operational surface and cost line. Factor in the integration work between your wired and wireless management planes. It won’t be as seamless as a single-vendor converged solution.
Support contracts. Commercial SONiC distributions aren’t free. Broadcom Enterprise SONiC, Dell Enterprise SONiC, Aviz Certified Community SONiC. They all come with support contracts. Cheaper than a Cisco SmartNet? Usually. Free? No.
Incident response. Your mean time to resolution will be longer on a new platform. That’s not a knock on SONiC. It’s true of any platform your team hasn’t operated for years. It’s especially true at the access layer, where the SONiC ecosystem is younger: Marvell Prestera SAI drivers, 1G hardware platforms, and features like PVST+ and 802.1X are all more recent and less battle-tested than their data center counterparts. Budget for it.

The BOM comparison is where the conversation starts. It shouldn’t be where it ends.

What You’re Actually Trading

The pitch for disaggregated networking is “escape vendor lock-in.” The reality is messier: you’re trading one type of dependency for another.

With a traditional vendor, the deal is straightforward. You write a check for hardware, software, and support bundled together. You get a single number to call when things break. You’re locked to their roadmap, their pricing, and their release cadence, but you’re also insulated from a lot of operational complexity. That insulation has value, and it’s easy to underestimate until it’s gone.

With SONiC and disaggregated hardware, you get procurement flexibility. You can source switches from Celestica this quarter and Edgecore next quarter. You’re not captive to one vendor’s pricing. But you take on the integration work. You own the testing matrix — every NOS version against every hardware platform against every feature combination you deploy, a validation effort that traditional vendors absorb for you. You’re responsible for validating that your NOS version works on your hardware with your feature set. That responsibility lands on your engineering team, and it doesn’t go away after the initial deployment.

The same principle applies to network disaggregation: focus on switching costs, not lock-in. Every platform has lock-in of some kind. The question is what it costs you to change. With Cisco, the switching cost is a hardware refresh and a config migration. With SONiC, the switching cost is lower on hardware but potentially higher on the operational and tooling side if you’ve built deep integrations.

There’s an upside to the trade that’s easy to overlook: with an open-source NOS, you can contribute upstream, influence the roadmap, and fix bugs yourself (or fund someone to). You’re not waiting on a vendor’s release train for a feature you need next quarter. That agency has real value for organizations with the engineering capacity to exercise it.

The honest framing: you’re not eliminating dependency. You’re moving it from a vendor relationship to an internal engineering capability. Whether that’s a good trade depends entirely on your organization.

The Scale Threshold

The business case for SONiC at the access layer is scale-dependent. This isn’t a controversial statement — it’s just math.

At small scale — say, under 100 switches — the engineering investment dominates. You’re hiring or retraining people, building tooling, standing up a lab, and absorbing the risk of a new platform. The hardware savings on 100 switches don’t cover that. Buy Meraki or Aruba, spend your engineering time on something else.

At medium scale — a few hundred switches across a handful of sites — it gets interesting but not obvious. The hardware savings start to add up, but you’re still carrying the full weight of the operational investment. This is the zone where the decision depends heavily on your team’s existing capabilities. If you already have strong automation practices and Linux-comfortable engineers, the marginal cost of adding SONiC is lower. If you’re starting from scratch on both, it’s a harder sell.

At large scale — thousands of switches across dozens or hundreds of sites — the math starts to favor SONiC, but only if the organizational readiness factors line up. The per-unit hardware savings compound across the fleet and across refresh cycles. The operational consistency argument kicks in: one NOS from spine to access port means one automation framework, one monitoring pipeline, one set of runbooks. And the negotiating power is real. When you’re buying thousands of switches, being able to source from multiple hardware vendors changes the dynamic. Scale is necessary for the business case to work, but it’s not sufficient on its own.

One thing the scale discussion often misses: “do nothing” isn’t free either. Vendor price increases compound — a 3–4% annual hardware uplift on a 2,000-switch fleet adds up over two refresh cycles. Lock-in deepens as you build more automation and tooling around a proprietary platform, raising your switching costs every year you stay. And the talent pool for legacy NOS administration is gradually shrinking as the industry shifts toward Linux-native infrastructure. The status quo has a cost trajectory too. Make sure your business case accounts for it.

The variables that determine where your break-even sits:

Fleet size. More switches = more capex savings to offset the opex investment.
Number of sites. More sites amplify both the savings (more hardware) and the complexity (more operational surface area).
Team maturity. A team that already runs infrastructure as code has a shorter ramp than one that manages everything by hand.
Contract timing. If you’re mid-cycle on a vendor contract with favorable terms, the urgency drops. If you’re facing a refresh with a steep price increase, the urgency spikes.
Greenfield vs. brownfield. New sites are easier. Migrating existing sites means running two platforms in parallel during the transition, which has its own cost.

Organizational Readiness

Before you evaluate hardware or run a PoC, ask these questions about your organization:

Does your team manage infrastructure as code today? If your network engineers are already writing Ansible playbooks, using Git, and deploying through CI/CD pipelines, the transition to SONiC is a platform change, not a paradigm change. If your workflow is “SSH into the switch and type commands,” you have a culture shift ahead of you that’s bigger than the technology shift.

Can your network engineers troubleshoot at the Linux OS level? SONiC problems don’t always look like network problems. Sometimes it’s a container that didn’t start. Sometimes it’s a systemd service in a failed state. Sometimes it’s a kernel driver issue. Your team needs to be as comfortable with journalctl and docker logs as they are with show ip bgp.

Can you recruit Linux-native network engineers? This talent pool is growing, but it’s still smaller than the pool of traditional network engineers. An EMA survey on network automation found that 27% of respondents pointed to staffing issues and skills gaps as a top challenge, with one engineer noting: “The most challenging thing for me is the lack of network engineers who can contribute to automation. The community is small, and it’s hard to find people who can help you solve a problem.” If you’re in a market where hiring is already hard, factor in the recruiting challenge. If you’re in a tech hub where Linux skills are common, this is less of a concern.

Is your organization comfortable with open-source support models? Commercial SONiC distributions come with support contracts, but the support experience is different from calling Cisco TAC. Community SONiC means GitHub issues and mailing lists. Know which model your organization can tolerate.

Do you have the patience for a multi-year build? This isn’t a forklift upgrade you execute in a quarter. It’s a capability you build over years: lab, pilot, limited production, broad rollout. A realistic timeline, in my experience: 6–12 months to stand up a lab and run a pilot, another 6–12 months for limited production at a handful of sites, and 1–2 years to reach broad rollout. Most organizations won’t see net positive ROI until year two or three, when the hardware savings across refresh cycles start outpacing the cumulative engineering investment. If your leadership expects payback in the first year, set that expectation early. Or find a different project.

If you answered “no” to most of these, SONiC isn’t necessarily the wrong choice. But your business case needs to include the cost of getting to “yes” on each one.

Building the Business Case

A credible business case has two parts: the spreadsheet and the narrative. You need both.

The spreadsheet covers what you can quantify:

Hardware cost delta: per-unit savings × fleet size × number of refresh cycles in your planning horizon
Support contract delta: commercial SONiC distribution costs vs. current vendor support
Staffing costs: new hires, training programs, potential salary premium for Linux networking skills
Tooling costs: what you build or buy to replace vendor-provided management platforms
Transition costs: lab buildout, pilot program, migration execution, parallel operation during cutover

To make this concrete: imagine a 1,000-switch fleet where white box hardware saves $2,000 per unit (a conservative estimate — Part 1 puts the delta at one-half to one-third of list price). Over two refresh cycles (roughly ten years), the capex delta is $4M. If your engineering investment is $1.5M in year one (hiring, lab, tooling) and $500K/year ongoing, you break even midway through year two. That math looks good on a slide. But if you also need to rebuild your management plane, add $500K–$1M to year one. If your team needs 12 months of ramp time before they’re productive on SONiC, push the break-even out another year. The point isn’t the specific numbers — it’s that the spreadsheet has to include all the lines, not just the hardware line.

The narrative covers what you can’t easily put in a cell:

Procurement leverage — your incumbent vendors won’t stand still. They’re actively raising prices; Cisco implemented an average ~3.4% hardware uplift in late 2025, with similar increases for technical services. Walking into a renewal with a credible SONiC PoC in your back pocket will sharpen their pencil, and that leverage is valuable even if you never deploy a single white box switch. But the reverse is also true: if your business case depends on a specific capex delta, aggressive incumbent discounting can erode it. Build your case on the operational and strategic benefits, not just the BOM savings, because the BOM savings are the part your current vendor can most easily match
Operational consistency — one NOS across your infrastructure reduces the cognitive load on your team and simplifies automation
Talent pipeline — you’re hiring from the Linux and DevOps talent pool, not just the “CCIE or equivalent” pool
Future optionality — you’re not waiting on one vendor’s roadmap for features you need. If the community or a different distro ships it first, you can adopt it
Ecosystem fragmentation risk — multiple commercial SONiC distributions (Broadcom, Dell, Aviz, Asterfusion) have different feature sets, release cadences, and proprietary extensions. Evaluate portability between distros, not just between SONiC and traditional vendors. If you build deep integrations against one distro’s proprietary MCLAG implementation, you’ve traded one form of vendor lock-in for another

Don’t oversell the savings. A business case that honestly acknowledges the tradeoffs (“we’ll save X on hardware but invest Y in engineering capability”) is more credible than one that only shows the capex delta. Decision-makers who’ve been around long enough have seen the “this will save us millions” slide deck before. They’re looking for the slide that says “here’s what could go wrong and here’s how we’ve accounted for it.”

What’s Next

This post covers whether the business case works. It doesn’t cover how you execute. If there’s interest, Part 3 will get into the operational details:

Commercial SONiC support vs. Cisco TAC in practice. Response times, escalation paths, bug fix turnaround. What “different” actually looks like when you’re troubleshooting a production outage at 2 AM.
Brownfield migration strategies. How do you actually migrate a live campus network from IOS to SONiC? Site-by-site? Building-by-building? How long do you run dual-stack, and what does parallel operation cost?
The testing and validation burden. What the NOS version × hardware platform × feature set matrix looks like in practice, and how to build a validation pipeline that doesn’t consume your entire engineering team.

My Take

My take: The technology is ready — Part 1 covered that. The business case is real at scale. But “at scale” is doing a lot of work in that sentence.

The organizations that will succeed with SONiC at the edge are the ones that treat it as an organizational capability investment, not a cost-cutting exercise. If the only line in your business case is “cheaper switches,” you’re setting yourself up for a painful surprise when the opex bill comes due.

The right framing: SONiC at the edge is a bet on your team’s ability to operate open infrastructure. The hardware savings fund that bet. The payoff is operational flexibility and procurement leverage that compounds over time — but only if you invest in the team and tooling to realize it.

If your organization has the scale, the engineering maturity, and the patience for a multi-year build, the math works. If you’re looking for a quick win on next quarter’s budget, buy Meraki.

SONiC Hits the Access Layer: Why 1G Commodity Switches Change the Math

brett@network-notes.com (Brett Lykins) — Mon, 06 Apr 2026 10:00:00 -0500

For years, the pitch for SONiC went something like this: “It’s what the hyperscalers run.” And that was true — and also the problem. If you weren’t running a spine-leaf fabric at 100G+, SONiC had nothing for you. The hardware didn’t exist at the access layer. No 48-port 1G copper switches. No PoE. Nothing below 25G.

That’s no longer the case.

I currently work on a team deploying SONiC 1G switches into a global network, with a goal to be “vendor of choice” for our internal customers — so I’m not a neutral party here. What I’m seeing firsthand is a market that has shifted faster than most enterprise network teams realize. If you’re managing tens of thousands of network nodes — office buildings, warehouses, retail locations, distribution centers — SONiC should be on your evaluation list.

SONiC in 60 Seconds

If you’re not familiar: SONiC (Software for Open Networking in the Cloud) is an open-source network operating system built on Debian Linux. Microsoft developed it for Azure’s data center network and open-sourced it in 2016. It now lives under the Linux Foundation as the SONiC Foundation.

The key architectural idea is the Switch Abstraction Interface (SAI). SAI sits between SONiC and the switching ASIC, providing a vendor-neutral API. This means the same NOS runs on silicon from Broadcom, Marvell, NVIDIA/Mellanox, and Intel — you pick the hardware, SONiC talks to it through SAI. The NOS itself is containerized: each major function (BGP, LLDP, SNMP, teamd, etc.) runs in its own Docker container, which means you can upgrade individual components without bouncing the whole switch.

For most of its life, SONiC ran exclusively on data center hardware — Broadcom Trident and Tomahawk ASICs in 25G/100G/400G switches. The enterprise access layer was not in scope.

What Changed

Three things happened in 2024–2025 that made SONiC viable at the access layer.

Marvell’s Prestera ASICs got SAI support. This is the big one. Marvell’s Prestera line is the silicon inside most commodity 1G and 2.5G access switches. Once SAI drivers existed for Prestera, SONiC could run on access-layer hardware. Marvell published a blog in October 2024 specifically about Cloud-Managed Enterprise switches powered by SONiC, signaling that this wasn’t a side project.

Hardware vendors shipped product.

Celestica announced four new enterprise access switches in May 2024 — the ES1000, ES1010, ES1050, and EG1050 — with 1GbE and 2.5GbE options, up to 48 ports, PoE support, and SONiC compatibility.
Asterfusion started shipping 48-port 1G PoE+ switches (CX204Y, CX206Y series) on Marvell Prestera with Enterprise SONiC preloaded.
Edgecore expanded its EPS and AS4600 series for enterprise access deployments.

These aren’t prototypes or reference designs — they’re shipping products with purchase orders behind them.

The result: you can now buy a 48-port 1G PoE+ L3 switch with 25G uplinks, running SONiC, from multiple vendors, at a fraction of what a comparable Cisco Catalyst or Arista switch costs. That sentence was not possible two years ago.

The access-layer feature set filled in. MC-LAG, DHCP snooping, and IGMP snooping are available in the commercial SONiC distributions. The SONiC 202505 release added PVST+ and 802.1X/MAB authentication — two features that were blockers for many access-layer deployments. The gap between SONiC and a traditional enterprise NOS feature set is narrowing fast.

Commercial Support Catches Up

Hardware alone doesn’t make a platform viable. The support ecosystem had to catch up, and it has.

The SONiC Foundation now counts 36 member organizations including Arista, who joined as a Premier Member in 2025. As of early 2024, the project had over 4,250 active contributors across 520+ organizations. This isn’t a niche project anymore.

On the commercial support side, enterprises now have real options:

Broadcom Enterprise SONiC Distribution — the most mature commercial offering. Hardened, extended feature set beyond community SONiC, multi-ASIC support, and commercial support contracts. Think of it as the Red Hat to community SONiC’s Fedora.
Dell Enterprise SONiC — built on Broadcom’s distribution, validated on Dell PowerSwitch hardware, with Dell’s 24/7 support organization behind it.
Aviz Certified Community SONiC — launched in late 2025, this is a pre-tested, multi-ASIC distribution based on community SONiC with added bug fixes, telemetry, and 24/7 commercial support.
Asterfusion AsterNOS — a commercial SONiC distribution specifically targeting access-layer and enterprise deployments on Marvell Prestera hardware.

You don’t have to go it alone with raw community SONiC anymore (though you can, if you have the engineering team for it).

The Open NOS Landscape

SONiC isn’t the only open or disaggregated NOS option. Here’s how the alternatives stack up for enterprise access-layer deployments:

	SONiC	DENT OS	Pica8 PICOS	OcNOS
License	Apache 2.0	Open source (LF)	Commercial	Commercial
Origin	Microsoft (2016)	Amazon/LF (2019)	Pica8 (2012)	IP Infusion
Hardware Abstraction	SAI	Linux SwitchDev	Proprietary	Proprietary
Supported ASICs	Broadcom, Marvell, NVIDIA, Intel	Marvell Prestera	Broadcom	Multi-vendor
1G Access Switches	Yes (2024+)	Yes (designed for edge)	Yes	Limited
PoE Support	Yes	Yes	Yes	Varies
Commercial Support	Multiple vendors	Limited	Pica8	IP Infusion
Management Platform	Varies by distro	None	AmpCon	OcNOS Manager
Enterprise Momentum	4,250+ contributors; multiple commercial distros	Small community	Single vendor	Established in SP

A few notes on the alternatives:

DENT OS is the most interesting comparison. Also a Linux Foundation project, DENT was designed from the start for the distributed enterprise edge — retail, campus, remote sites. It uses Linux SwitchDev instead of SAI, which means you configure switches using standard Linux tools (ip, bridge, tc). If you have a team of Linux sysadmins who happen to manage network switches, DENT’s approach is appealing. The tradeoff is a much smaller ecosystem and limited commercial support options. DENT is worth watching, but SONiC has the momentum.

Pica8 PICOS is a commercial disaggregated NOS targeting enterprise campus networks. It runs on Broadcom-based white box hardware, offers a Junos-like CLI with transactional commit-confirm, and includes AmpCon for centralized ZTP and lifecycle management. The tradeoff: it’s not open source, and you’re trading one vendor dependency for another (albeit a cheaper one).

OcNOS from IP Infusion is a mature commercial disaggregated NOS with strong service provider adoption — worth evaluating if you want hardware disaggregation without the open-source model.

A note on Cumulus Linux: Cumulus was the original disaggregated NOS pioneer and deserves credit for proving the model. But NVIDIA’s acquisition fundamentally changed its trajectory. It now runs exclusively on NVIDIA Spectrum ASICs, dropped Broadcom support after the 4.x release line, and as of mid-2025, is no longer available as a standalone image. I’m not including it in the comparison table because it’s not a viable option for new enterprise access-layer deployments. If you’re currently running Cumulus on Broadcom hardware, Pica8 is actively positioning PICOS as a migration path.

When to Evaluate SONiC for Your Access Layer

SONiC makes the most sense when several of these conditions are true:

You have scale. If you’re managing hundreds or thousands of access switches across many sites, the per-unit cost savings on hardware compound fast. One engineer on the Network Automation Forum estimated potential savings of $1.3 million on a single edge upgrade — though the same discussion noted that compensating costs in staffing and operational complexity can eat into those numbers. White box hardware commonly runs at one-half to one-third the cost of branded equivalents from Cisco or Arista.

You have (or can build) the engineering team. SONiC is Linux. Your network engineers need to be comfortable with Debian, systemd, Docker containers, and debugging at the OS level. This is a different skill set than CLI-driven IOS or EOS administration. If your team already treats infrastructure as code and manages config via automation, the transition is smoother than you’d expect. If your team’s workflow is “SSH in and type commands,” you have a culture change ahead of you, not just a technology change.

You want operational consistency across your stack. If you’re already running SONiC in your data center (or plan to), extending it to the access layer means one NOS, one automation framework, one monitoring pipeline, one set of operational procedures from spine to access port. That operational simplification has real value at scale.

You’re tired of vendor lock-in. With SONiC, you can swap hardware vendors without changing your NOS, your automation, or your operational tooling. If Celestica has a better price on 48-port switches this quarter but Edgecore wins next quarter, you can mix and match.

When to Stay Away

You need plug-and-play simplicity. If your network team is small, your sites are few, and you need something that works out of the box with a GUI and phone support, buy Meraki or Aruba. SONiC will cost you more in engineering time than you’ll save on hardware.

You need mature wireless integration. SONiC is a wired switching NOS. It doesn’t manage access points, and there’s no equivalent to Cisco’s wireless controller integration or Arista’s CloudVision for converged wired/wireless management. You’ll need a separate wireless solution and the operational overhead that comes with it.

Your organization can’t tolerate risk on network infrastructure. Community SONiC has real rough edges — unstable build pipelines, inconsistent platform testing across releases, and gaps in management tooling compared to mature commercial platforms. The commercial distributions smooth this out significantly, but even Enterprise SONiC is younger and less battle-tested at the access layer than IOS-XE or EOS. If your business requires five-nines uptime guarantees with vendor accountability, the commercial SONiC distributions are getting there, but you should evaluate carefully.

The Trajectory

The direction is clear. ONUG reported in early 2025 that SONiC is increasingly deployed in enterprise verticals like telco and financial services, and Aviz Networks CEO Vishal Shukla noted that “since 2023, SONiC enterprise deployment has shifted from early adopters to large, mainstream enterprises.”

The 1G access-layer hardware availability is the inflection point. SONiC’s value proposition was always strong at the data center layer — the economics made sense when you’re buying 100G switches at scale. But most enterprise network ports are 1G copper at the access layer. That’s where the volume is. That’s where the spend is. And now that’s where SONiC runs.

The organizations that will benefit most are the ones with enough scale to justify the engineering investment and enough sites to make the hardware savings meaningful.

My take: The “SONiC is only for hyperscalers” era is over. The hardware gap at the access layer — the thing that kept SONiC out of most enterprise conversations — closed in 2024. If you’re running tens of thousands of switch ports across a global footprint, the math works, the hardware exists, and the support ecosystem is real. The learning curve is steep and the cultural shift is significant, but for organizations with the scale and engineering maturity to make the investment, the economics speak for themselves.

In Part 2, I dig into the business case — what the real costs look like beyond the BOM, when the math works, and how to build a case that doesn’t fall apart when the opex bill comes due.