NVIDIA Spectrum-X AI-Native Ethernet Fabric Adds MRC for Gigascale AI

NVIDIA Spectrum-X — the Open, AI-Native Ethernet Fabric — Sets the Standard for Gigascale AI, Now With MRC

NVIDIA added MRC support to Spectrum-X Ethernet, letting one RDMA connection spread traffic across multiple paths. MRC ran in Blackwell deployments, with microsecond failure bypass and hardware rerouting. The key detail is the OCP open specification and multiplane support for clusters up to hundreds of thousands of GPUs.

Why it matters: HKR-K/R are solid: MRC stripes one RDMA flow across paths, detects failures in microseconds, and is tied to Blackwell deployments. HKR-H is narrow and the source is vendor-owned, so this stays below major release level.