Egress Only VPC Transit Gateway

VPC A ( Dev )

Subnets: - 2 public & 2 private - 2 Transit Gateway Subnet

Security Group - Default VPC - TransitGateway VPC ( is it required ? )

Route Table - private - public - transit ( is it required ? )

VPC B ( Prod )

• same as VPC A

VPC C ( Egress )

Subnets: - 2 public & 2 private - 2 Transit Gateway Subnet

Security Group - Default VPC - TransitGateway VPC

Transit Gateway

- Attachment
  - VPC A
  - VPC B
  - VPC C
    - Appliance Mode ( If cross zone required - I'm not sure )

Transite Gateway Route Table - Isolated-Route-Table - Association - VPC A, VPC B - Propagation - VPC C - Egress-Route-Table -