Implementing Cellular Redundancy: Cross-Cloud Failover with AWS Transit Gateway and Azure ExpressRoute

Introduction Standard multi-regional deployments often fall victim to centralized networking bottlenecks and shared control plane failures. When a primary cloud region experiences a backbone connectivity issue, the entire distributed system can lose its ability to synchronize state, leading to split-brain scenarios and data corruption. Engineers frequently rely on simple public internet VPNs for interconnectivity, which introduces unpredictable latency and security vulnerabilities. Agitating the