Google operates 13 global data centers that require massive bandwidth for data replication and storage. Google faced challenges with the inflexible and inefficient architecture of traditional networks. Google implemented a Software Defined Wide Area Network (SDWAN) using OpenFlow and a centralized control approach. The SDWAN includes a global bandwidth broker, traffic engineering server, SDN gateways, and integration with existing routing protocols. This provides optimized traffic routing, faster convergence on failures, and 95% link utilization while connecting all data centers as a single logical network.