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400G to 800G Migration Playbook — four-phase approach for AI data center fabric upgrades

1.6T Ready

400G to 800G Migration Playbook: A Four-Phase Approach for Production AI Fabrics

Mar 31, 2026 Rajesh Shekhawat

Moving from 400G to 800G doesn't require a forklift upgrade. This playbook covers a four-phase approach — audit, spine upgrade with breakout, leaf migration, and full 800G fabric — that keeps production AI workloads running throughout the transition and leaves your fiber plant 1.6T-ready.