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CONCEPT Cited by 1 source

Network fabric disaggregation

Definition

Network fabric disaggregation is the architectural stance of splitting a vertically-integrated network fabric — switch ASIC + switch hardware + NOS + control plane + endpoint NIC — into open, independently-chosen, standards-based layers, so that each layer can be sourced from multiple vendors and scaled independently.

This is the networking-layer analog of disaggregation already common elsewhere: storage disaggregation (compute-storage separation), compute disaggregation (microservices on container orchestrators over commodity hardware), and power disaggregation (Meta × Microsoft's Mount Diablo).

Meta's framing (2024-10)

Meta's Disaggregated Scheduled Fabric (DSF) names three specific limits a vertically-integrated fabric imposes and that disaggregation relaxes:

  1. Scale limits — vertical integration couples scale-up of all components; any one layer becomes the bottleneck.
  2. Component supply options — single-vendor switch ASICs + single-vendor NICs create supply risk.
  3. Power density limits — thermals from co-located components constrain the full stack.

"Disaggregating our network allows us to work with vendors from across the industry to design systems that are innovative as well as scalable, flexible, and efficient." (Source: sources/2024-10-15-meta-metas-open-ai-hardware-vision)

The substrate layers DSF instantiates

  • Switch ASIC — multi-vendor (DSF uses both Broadcom and Cisco 51T ASICs).
  • Switch NOS — Meta's FBOSS.
  • ASIC control API — OCP-SAI (the vendor-agnostic abstraction).
  • Endpoint protocol — Ethernet + RoCE.
  • Endpoint NICs — multi-vendor (NVIDIA, Broadcom, AMD explicitly named; also Meta's own FBNIC).

Why it matters

  • Vendor independence as a resilience property. Open interfaces let a hyperscaler shift workloads between vendor implementations without rewriting its fabric software.
  • Composition over integration. Disaggregated fabric scales by adding/replacing components, not by forcing a forklift upgrade.
  • Operator expertise reuse. FBOSS (NOS) survives across generations of ASIC silicon via the SAI abstraction.

Seen in

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