Bridge the AI Infrastructure Gap
A technical guide to building lossless, high-bandwidth Ethernet for generative AI and HPC. Stop GPUs from idling on retransmits — keep them computing.
Congestion in an AI cluster costs millions, not minutes
Traditional data center networks were architected for predictable north-south traffic. Generative AI shifted the entire model to a "scale-out fabric" — massive, synchronized, constant GPU-to-GPU communication. In that environment, packet loss isn't an inconvenience: it triggers retransmissions that force expensive accelerators to wait. Idling extends Job Completion Time, stalls ROI, and pushes facilities into power ceilings before they finish scaling.
Purpose-built for AI lossless networking
Arista intelligent switching plus Broadcom Ethernet NICs, working together to deliver a proactive (not reactive) congestion model.
RoCEv2 transport
PFC + ECN
Up to 512-way ECMP
Sustainable density
PFC on Arista interfaces
Two interface-mode commands enable Priority Flow Control on a per-traffic-class basis. They pair with ECN marking elsewhere in the fabric and the priority-flow-control watchdog mechanism to prevent deadlock during sustained congestion.
Source: PFC syntax as cited in the Arista 7000-Series RoCE deployment reference. The full production-ready RoCE configuration also involves DSCP/CoS marking, ECN thresholds, and queue tuning — talk to our team for a complete config tailored to your topology.
! Arista EOS — interface-mode PFC for RoCEv2
interface Ethernet1/1
! Enable PFC negotiation on the link
priority-flow-control mode on
! Mark traffic class <TC> (typically 3 for RoCE) as no-drop
priority-flow-control priority <TC> no-drop
!
endMatch the platform to the fabric tier
A resilient AI architecture matches specific hardware to four fabric types: front-end, internal-AI, scale-up, and scale-out. 7010X handles management. 7060X and 7260X serve as the leaf-spine workhorse on Tomahawk/Trident silicon. 7280R and 7800R on Jericho deliver VOQ and deep buffers for the scale-out tier where all-to-all collectives demand zero head-of-line blocking.
A self-healing OS for jobs that can't be interrupted
AI training runs for weeks. The OS underneath the fabric has to assume processes will fail — and recover without operator action.
Zero Touch Provisioning
LANZ telemetry
CloudVision + ISSU
Architect a lossless AI fabric with us
Specialized in Arista-Broadcom: deep-buffer Jericho vs. high-density Tomahawk selection, RoCEv2 tuning, and sustainability metrics that fit your facility envelope.
The Arista hardware that bridges the gap
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