What Is Spine Switch?_
In a leaf-spine architecture, spine switches serve as the backbone, with each spine linking to all leaf switches in a full-mesh topology. This design ensures that any server-to-server path traverses at most one spine hop, simplifying latency and bandwidth planning. Spine switches typically lack direct server connections and focus on high-speed interconnects between leaf switches.
Technical Details
Spine switches use high-port-count ASICs to aggregate many leaf uplinks, often at high speeds such as 400G per port. They require optical transceivers and MPO cabling for scale-out fabrics like InfiniBand or Ethernet. In GPU clusters, spine switches handle inter-rack traffic over fiber, while intra-rack GPU communication uses NVLink copper directly. No torque screws are involved; all fiber connections use push-pull MPO connectors per the relevant standard.
How Leviathan Systems Works with Spine Switch
In our field deployments, spine switches are installed in dedicated network racks with structured cabling to each leaf rack, often requiring careful fiber management and polarity checks. We commission these switches by verifying link bring-up and fabric convergence before GPU nodes are powered.
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