OpenAI MRC, SRv6, and the Architecture of Frontier AI Supercomputers

In this episode of the Neural Intel podcast, we go under the hood of OpenAI’s latest networking contribution to the Open Compute Project (OCP). We analyze the technical shift from single-path RoCE deployments to multi-plane high-speed networks that allow for 800Gb/s interfaces to be split into eight parallel 100Gb/s planes.We discuss:Packet Spraying & Trimming: How MRC delivers out-of-order packets directly to memory addresses while handling destination congestion.The Death of BGP in the Core: Why OpenAI replaced dynamic routing with SRv6 source routing to eliminate whole classes of routing failures.Real-World Resilience: Insights from the OCI Abilene and Microsoft Fairwater deployments where Tier-1 switches were rebooted during training without interrupting the job.Neural Signal Check: For the Architect and Strategic CTO, the "moat" here is the transition to a static network control plane, which simplifies the stack and allows for hardware maintenance (reposts and repairs) while training is in service.Join the conversation on X/Twitter: @neuralintelorg Read the full technical breakdown: neuralintel.org