Arista introduces 7800R4 Universal AI Spine for AI centers

Arista has announced the 7800R4 as its Universal AI Spine platform for large-scale AI deployments.

• Main announcement: Arista unveils the 7800R4 AI Spine (part of the 7800-series) as an integrated alternative to disaggregated leaf–spine fabrics, offering predictable RDMA performance, centralized control-plane and management, and support for 400G/800G/1.6Tbps interfaces; the portfolio includes 20+ Etherlink switches and is positioned for AI clusters ranging from tens of thousands up to ~100k XPUs.
• Background and details: The platform leverages features such as Virtual Output Queuing (VOQ), large ingress buffers, hierarchical buffering, Arista EOS with real-time load balancing, and telemetry tools (AI Analyzer, Latency Analyzer); hardware resiliency includes redundant supervisors, fabric cards, and field-replaceable components, and the product is presented as interoperable with partners like AMD, Anthropic, Arm, Broadcom, Nvidia, OpenAI, Pure Storage and Vast Data.