Alibaba Cloud Infrastructure

Sep 26, 2025 · Artificial Intelligence

How Alibaba’s UPN512 Redefines AI Scale‑Up Networking with Optical Interconnects

The UPN512 whitepaper details Alibaba Cloud's next‑generation AI infrastructure network, explaining the shift from dense to MoE models, the rise of train‑and‑inference integration, xPU scale‑up challenges, and how high‑radix Ethernet with LPO/NPO optical interconnects delivers ultra‑high bandwidth, low latency, cost‑effective, and reliable large‑scale AI compute clusters.