In your Teradata environment, create the transit gateway in your account.
See https://aws.amazon.com/blogs/aws/new-use-an-aws-transit-gateway-to-simplify-your-network-architecture/ for more information.
- Enable Auto Accept Shared attachments.
- Disable Default Route table propagation.
Attach the local VPC subnets to the transit gateway.
You must create a transit gateway attachment for each subnet that is required to communicate with the Teradata environment.
- Once the setup is completed, send the transit gateway resource ID to Teradata using the Share ID option.
- Provide the IP address range used for transit gateway to your Teradata associate.