A 400G migration is more than a switch replacement. Port form factor, fiber topology, thermal limits and breakout strategy affect both capital cost and operational risk.
Choose the form factor and reach
QSFP-DD offers backward compatibility with many QSFP-family modules, while OSFP provides additional thermal headroom. SR8 is common for short parallel multimode links; DR4 and FR4 address single-mode data center reaches; LR4 supports longer campus and metro applications.
Audit the fiber plant
Document connector types, polarity, insertion loss and available strands. Decide where 400G links will operate natively and where breakout cables will connect 100G or 50G equipment during transition.
Plan power and cooling
400G optics consume more power than 100G modules. Validate per-port budgets, airflow direction and rack thermal capacity. Use staged deployment and telemetry baselines to identify abnormal module temperatures or optical levels.
Migration sequence
- Inventory applications and link utilization.
- Validate a representative hardware and optics combination.
- Deploy redundant paths before migrating production traffic.
- Keep coded spares and tested breakout assemblies on site.
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