AWS Transit Gateway for Multi-VPC and On-Premises Connectivity

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.

Challenges

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

Solutions

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

Results

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.

Related Content

X

We are here to help

Schedule a Meeting

+44 (0) 20 7131 0263
CONTACT
US