Ethernet vs InfiniBand for AINarrow moat

The defining technical battle of the moment — and a huge opportunity for Arista — is the shift from Nvidia's proprietary InfiniBand to open, standard Ethernet for connecting AI clusters. Training a large AI model requires wiring thousands of GPUs together with extreme bandwidth and low latency, and this back-end networking was historically dominated by InfiniBand, a specialized, proprietary interconnect that Nvidia controls. But the industry is increasingly turning to Ethernet — the open, universal, massively-scalable networking standard that is Arista's home turf — for AI, drawn by its openness (no single-vendor lock-in), its vast ecosystem, its proven scalability, and industry efforts (like the Ultra Ethernet Consortium) to make Ethernet as capable as InfiniBand for AI. As the leader in high-performance Ethernet, Arista is a primary beneficiary of this shift.

The Ethernet-versus-InfiniBand shift is a secular tailwind of great importance to Arista: if AI networking moves decisively to Ethernet, it opens an enormous market to Arista's core strength, and the momentum has been running Ethernet's way, with Arista winning large AI back-end business on Ethernet from customers who prefer the open standard. One thing cuts against it: Nvidia controls both sides of the debate: it sells InfiniBand, and it has built its own high-performance Ethernet (Spectrum-X) to capture the Ethernet AI-networking business as the shift happens — so even as Ethernet wins over InfiniBand, Nvidia aims to win the Ethernet, using its control of the GPUs to bundle and advocate for its own networking. The Ethernet-versus-InfiniBand shift is a genuine, powerful tailwind that plays directly to Arista's strength and is driving its AI win; but the prize is contested by Nvidia on both fronts — defending InfiniBand and competing in Ethernet — so it is a battle Arista is winning — AI networking targeted at ~$3.6 billion, more than doubling¹ — not a market it has won, against the most formidable competitor in AI.