Arista Networks designs high-performance Ethernet switches and the EOS network operating system that runs on them. Its switches are used in hyperscale data centers to move data between servers at high speed and low latency. Arista has long served the largest cloud operators—Meta, Microsoft, Google—with switching infrastructure for their general-purpose computing networks, a customer base that has become the core of the AI networking market.

The shift of large-scale AI training from proprietary networking fabrics to Ethernet has expanded Arista's opportunity substantially. GPU clusters require high-bandwidth, low-latency networks to coordinate parallel computation across thousands of accelerators. As hyperscalers have moved to build AI clusters on Ethernet rather than InfiniBand—driven by cost, vendor diversity, and ecosystem breadth—Arista has been a primary beneficiary. Its 800G switching platforms and AI Spine architecture are designed for the traffic patterns of distributed AI workloads.

Full-year 2025 revenue reached $9B, up 29% YoY, with AI networking a significant contributor. Arista launched the R4 series platform for AI cluster and data center deployment, and introduced CloudVision UNO, a network observability tool providing job-centric monitoring for AI training runs. The company deployed networking infrastructure for four major hyperscaler AI clusters.