Ultra Ethernet
Beginner
New rules for Ethernet, written by many companies together, to make it work better for AI.
Novice
The Ultra Ethernet Consortium’s open specification (version 1.0 in June 2025) for a new transport and related link and switch features for AI and HPC networks over standard Ethernet and IP.
Expert
Defines UET (semantic, packet-delivery, congestion-management and security sublayers, programmed via libfabric) with packet spraying, unordered reliable delivery, NSCC/RCCC congestion control, optional packet trimming, link-layer retry and credit-based flow control.
Explained in Scale-out networking (Systems).
See also: RoCE (RDMA over Converged Ethernet), Packet spraying.