The interconnect architecture linking compute nodes; topologies include Spine-Leaf, Fat-Tree, and Dragonfly.
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Networking Fabric is the interconnect architecture that links compute nodes within a cluster, defined by its topology — Spine-Leaf, Fat-Tree, or Dragonfly. The fabric design determines how efficiently data can move between any two GPUs, which directly affects training throughput at scale. Fabric architecture is where networking vendors compete on both bandwidth and cost-per-port. See Networking & Optical 101.