basic

Basic Example - Simple 2-VPC Transit Gateway

This example creates a Transit Gateway connecting two VPCs using default route tables for full mesh connectivity.

Architecture

  +--------+          +------------------+          +--------+
  | VPC A  |--------->| Transit Gateway  |<---------| VPC B  |
  | 10.1.0 |          | (Default RT)     |          | 10.2.0 |
  +--------+          +------------------+          +--------+

Both VPCs are attached to the Transit Gateway and use the default route table, enabling bidirectional communication.

Usage

terraform init
terraform plan
terraform apply

Resources Created

• 1 Transit Gateway
• 2 VPC Attachments (one per VPC)
• 2 VPCs with private subnets (supporting resources)

Estimated Cost

• Transit Gateway: ~$36/month (per attachment hour)
• VPC Attachments: ~$0.05/hour per attachment
• Data processing: $0.02/GB

See AWS Transit Gateway Pricing for current rates.