Arista 7700R4 Series

The Arista 7700R4 Distributed EtherLink Switch is an architectural departure from traditional modular chassis design: rather than containing all line cards within a single cabinet, the 7700R4 separates the central switching fabric (housed in the 7700R4-SUP supervisor unit) from distributed line-card pods (7700R4-LP line-card pods) connected via high-speed fabric links, allowing the aggregate port count to scale beyond what a single chassis can physically accommodate. This distributed architecture targets petabit-class AI spine switching where the bandwidth requirements of tens of thousands of GPU nodes exceed the port density of any conventional modular chassis.

Line-card pods support 400G and 800G Ethernet interfaces for GPU node attachment, with fabric interconnect operating at 800G or higher between the supervisor and pods to provide non-blocking switching across the distributed topology. The platform runs EOS with full AI fabric features including Priority Flow Control, DCQCN hardware congestion control, RoCE v2 support, and hardware ECN marking, applying the same lossless Ethernet fabric controls as the 7358X4 and 7368X4 modular AI fabric switches, but at a scale that those chassis cannot reach within a single cabinet.