AWS Transit Gateway is a new service that enables customers to connect thousands of Amazon Virtual Private Clouds (VPCs) and their on-premises networks using a single gateway. As you grow the number of workloads in AWS across multiple accounts, you need to scale your networks, control your connectivity policies better and monitor your network effectively. Today, you can connect pairs of Amazon VPCs using peering. However, managing point-to-point connectivity across large number of VPCs, without centrally managing connectivity and routing policies, can be operationally costly and cumbersome. This solution can be hard to manage for hundreds of VPCs.