⚠ Dependence on Broadcom SiliconModerate threat

The merchant-silicon model's efficiency comes with a real dependence: Arista relies heavily on Broadcom for its most critical networking chips, and Broadcom sells the same silicon to everyone, so the hardware confers no exclusive advantage and Arista's supply, cost, and roadmap are partly in a powerful supplier's hands. Broadcom is the dominant merchant networking-silicon maker, and its chips are the foundation of Arista's products — but also of Arista's competitors' products, of white-box switches, and of the hyperscalers' own designs. This means the raw capability Arista builds on is available to the whole market, so Arista's differentiation must come entirely from the software and system design it adds on top; the silicon is a shared input, not a moat.

The dependence carries specific risks. Arista's access to the newest, best silicon, its pricing, and its roadmap depend on Broadcom's decisions and priorities, and a supplier that serves the whole market has its own interests that may not align with Arista's. A supply constraint, a price increase, a shift in Broadcom's roadmap or priorities, or a decision to favor other customers or its own system-level ambitions would affect Arista directly. And because competitors use the same silicon, Arista cannot win on the chips — only on what it does with them — so a rival that closes the software and systems gap could neutralize Arista's advantage using identical hardware. Arista manages the Broadcom relationship well, the merchant-silicon model has served it superbly, and its software and systems edge on top of the shared silicon is genuine and hard to match. But an investor should recognize the dependence: Arista's critical components come from a single dominant supplier that arms its competitors and the white-box market alike, its hardware capability is not proprietary, and its entire advantage rests on the software and systems it layers onto silicon that everyone can buy — a real dependence — Broadcom sells the same parts to Arista's competitors¹ — and a reason the moat lives in software and skill, not in the hardware itself.