In a live brownfield data center network, taking a prolonged maintenance window to cut over an entire infrastructure at once is rarely an option. Enterprise applications demand continuous availability, making all-at-once “cold” cutovers high-risk and impractical.
To achieve predictable, zero-downtime cutovers, network architects rely on a Warm Migration Model. By extending legacy Layer 2 domains directly into the Cisco ACI fabric, workloads can be migrated incrementally—subnet by subnet and server by server—without disrupting live production traffic.
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