Episode Details

This story was originally published on HackerNoon at: https://hackernoon.com/bgp-based-congestion-signaling-for-leaf-spine-data-center-fabrics.
A proposal to use BGP as a fabric-wide congestion signaling mechanism, reducing AI workload tail latency and improving ECMP path balance.
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This article proposes BGP-CN, a congestion notification mechanism that uses BGP extended communities to distribute congestion information across leaf-spine data center fabrics. Rather than relying solely on local mechanisms such as ECN, PFC, and DCQCN, BGP-CN provides fabric-wide visibility, allowing switches to proactively adjust ECMP weights before congestion spreads. Prototype testing on a SONiC/FRR environment showed a 47% reduction in P99 tail latency and a 63% improvement in path utilization balance.