What is AWS Transit Gateway?
AWS Transit Gateway is a network transit hub that connects VPCs and on-premises networks through a central point. Instead of connecting each VPC to every other VPC (mesh topology), Transit Gateway acts as a central router. This reduces complexity from n*(n-1)/2 to just n connections.
Core Features
- Centralized Routing: One hub connects all VPCs and on-premises networks
- Route Tables: Traffic segmentation through separate routing tables
- Inter-Region Peering: Connect Transit Gateways across AWS regions
- Multicast Support: Native multicast traffic support between VPCs
- Network Manager: Central visibility and monitoring of all network connections
Typical Use Cases
Network Consolidation: Organizations with many VPCs replace complex peering structures with a central hub. Management reduces from dozens of peering connections to a few Transit Gateway attachments.
Hybrid Cloud Connectivity: Connect on-premises data centers to AWS via VPN or Direct Connect. Transit Gateway enables on-premises access to all connected VPCs through a single connection.
Network Segmentation: Separate route tables isolate development, test, and production environments while shared services like DNS or authentication are provided centrally.
Benefits
- Dramatic reduction of network complexity as infrastructure grows
- Centralized management of routing policies and security rules
- Scales up to 5,000 VPC attachments per Transit Gateway
- Automatic encryption of traffic between regions
Integration with innFactory
As an AWS Reseller, innFactory supports you with Transit Gateway: network architecture, migration of existing peering structures, routing optimization, and hybrid cloud connectivity.
Typical Use Cases
Frequently Asked Questions
What is the difference between Transit Gateway and VPC Peering?
VPC Peering connects two VPCs directly. Transit Gateway acts as a central hub connecting many VPCs and on-premises networks in a hub-and-spoke topology. For more than 3 VPCs, Transit Gateway is the better choice.
Can Transit Gateway work across regions?
Yes, with Inter-Region Peering you can connect Transit Gateways in different AWS regions. Traffic stays on the AWS backbone and never leaves the AWS network.
How does Transit Gateway billing work?
You pay per hour for each attachment connection (VPC, VPN, Direct Connect) plus data transfer fees. Costs are predictable and scale with usage.
Which networks can I connect with Transit Gateway?
Transit Gateway supports VPCs, VPN connections, AWS Direct Connect Gateways, and Transit Gateway Peering with other Transit Gateways in the same or different regions.