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Beyond Traditional BGP: Decoupling Route Distribution for Large-Scale AI Clusters at Alibaba#

OCP Global Summit 2026 digest Program Core pick 12–15 October 2026

Abstract Recording

Eddie Ruan (Alibaba), Dennis Cai (Alibaba)

Play the recording: Beyond Traditional BGP: Decoupling Route Distribution for Large-Scale AI Clusters at Alibaba

  • Why: Directly in the PM's BGP/datapath-internals interest: a concrete alternative to Microsoft's Fairwater host-SRv6 approach for AI-cluster routing scale, from a provider that can't mandate host-side changes — a real architectural debate with numbers attached.
  • What: An architectural decoupling of service route distribution from infrastructure route distribution: regular BGP continues to carry infrastructure routes within spine/leaf, while service routes are redistributed among leaf switches by multiple route reflectors, recursively resolved over the loopback of the anchoring leaf switch (from abstract only).
  • How: A "Group RR" concept coordinates multiple RRs to provide Graceful Restart capability and high availability for critical service prefixes, so service routes survive RR cluster outages; positioned explicitly against Fairwater's <1,000-route / 256-way-ECMP host-SRv6 model from OCP 2025.
  • Where applicable: Alibaba-specific architecture for multi-tenant clouds that cannot impose host changes — broadly applicable to any provider facing the same constraint; BGP-only, no host or silicon requirements.