ABC was scaling rapidly in the cloud, with over 20 Amazon VPCs deployed across teams, environments, and regions. Additionally, the company operated two on-premises data centers supporting legacy systems and regulatory workloads. Connectivity was managed using a mix of VPC peering and VPN tunnels, which created growing complexity.
Key pain points included:
Manual routing and inconsistent access control
Too many individual peering links and VPNs
Difficulty troubleshooting connectivity issues
Limited scalability as new environments were added
ABC adopted AWS Transit Gateway to centralize network routing and simplify cloud and hybrid connectivity.
Implementation steps included:
Attaching all VPCs to a regional Transit Gateway using hub-and-spoke architecture
Connecting on-premises data centers using AWS Direct Connect and Site-to-Site VPN
Segmenting environments using multiple TGW route tables
Sharing the Transit Gateway across AWS accounts using Resource Access Manager
Establishing inter-region peering between US-East and EU-West for global operations
Reduced over 60 point-to-point connections to a single, centralized gateway
Improved network visibility and reduced misconfiguration risk
Increased security through environment-level route isolation
Achieved faster onboarding of new VPCs and teams
Reduced network maintenance time by 40% and improved performance stability
By implementing AWS Transit Gateway, ABC replaced fragmented networking with a scalable and secure architecture. The solution enabled centralized control, improved hybrid cloud integration, and provided the foundation for future global expansion.