Transit Gateway

  • A network gateway that simplifies VPC, VPN, and Direct Connect networking.

  • Eliminates complex peering connections between multiple VPCs.

  • Supports transitive routing, meaning traffic can flow through TGW between networks.

🔗 TGW Connectivity Features

  • Peers VPCs:

    • Same account or different accounts.

    • Same region or across different regions (Inter-Region Peering).

  • Connects:

    • VPCs

    • VPNs (Customer Gateway)

    • Direct Connect (Private connections to AWS)

🛣️ TGW Routing & Isolation

  • TGW Route Tables (TGW RTs) control how traffic moves across attached networks.

  • Routing Isolation via Route Tables:

    • Associations: Each attachment (VPC, VPN, DX) is linked to one TGW route table.

    • Propagation: Determines which TGW route tables learn about an attachment’s routes.

    • By customizing RTs & propagation, you can isolate networks (e.g., keep Prod & Dev separate).

🧠 Quick Summary

Feature
Description

Purpose

Central hub for VPC, VPN, and Direct Connect networking

Peering Support

Works across accounts & regions

Transitive Routing

Yes, enables traffic between connected networks

Route Table Association

Attachments must be linked to a TGW route table

Route Propagation

Controls which routes are shared across TGW route tables

Routing Isolation

Use separate route tables for network segmentation

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