Transit Gateway – Sharing Direct Connect Across Multiple Accounts

Purpose

• Use Transit Gateway (TGW) and AWS Resource Access Manager (RAM) to allow multiple AWS accounts to share a single Direct Connect (DX) connection.

Architecture

• Corporate Data Center connects to AWS through Direct Connect and on-premises routing equipment.

• Direct Connect Location hosts the DX endpoint using a Transit Virtual Interface (Transit VIF) over a dedicated VLAN.

• Direct Connect Gateway (DXGW) links the DX connection to Transit Gateway.

• Transit Gateway connects to VPCs in multiple AWS accounts; shared via AWS RAM.

Benefits

• Centralizes and scales hybrid connectivity.

• Reduces cost by avoiding multiple DX lines.

• Simplifies routing and management in multi-account architectures.