# BGP-Based Congestion Signaling for Leaf-Spine Data Center Fabrics

Page: https://stenobird.com/podcast/tech-stories-tech-brief-by-hackernoon-6365648/bgp-based-congestion-signaling-for-leaf-spine-data-center-fabrics
Text version: https://stenobird.com/podcast/tech-stories-tech-brief-by-hackernoon-6365648/bgp-based-congestion-signaling-for-leaf-spine-data-center-fabrics.md
Podcast: [Tech Stories Tech Brief By HackerNoon](https://stenobird.com/podcast/tech-stories-tech-brief-by-hackernoon-6365648)
Published: 2026-06-18T16:00:33+00:00
Episode link: https://share.transistor.fm/s/70197c52
Audio file: https://media.transistor.fm/70197c52/f91887da.mp3
Processing state: not_requested
JSON: https://stenobird.com/v1/public/podcasts/tech-stories-tech-brief-by-hackernoon-6365648/episodes/bgp-based-congestion-signaling-for-leaf-spine-data-center-fabrics
Duration seconds: 1378

## Resource

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. Check more stories related to tech-stories at: https://hackernoon.com/c/tech-stories . You can also check exclusive content about #bgp , #leaf-spine-networking , #data-center-networking , #ecmp , #ai-infrastructure , #network-engineering , #frrouting , #hackernoon-top-story , and more. This story was written by: @vijayananda . Learn more about this writer by checking @vijayananda's about page, and for more stories, please visit hackernoon.com . 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.

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