Transit Gateway Centralized Router Description

• This Transit Gateway Centralized Router module will create a hub spoke topology from existing Tiered VPCs.
• Will use the special public subnet in each AZ when a Tiered VPC is passed to it.
• All attachments will be associated and routes propagated to one TGW Route Table.
• Each Tiered VPC will have all their route tables updated in each VPC with a route to all other VPC networks via the TGW.
• Will generate and add routes in each VPC to all other networks.

Example:

module "centralized_router" {
  source  = "JudeQuintana/centralized-router/aws"
  version = "1.0.0"

  env_prefix       = var.env_prefix
  region_az_labels = var.region_az_labels
  centralized_router = {
    name            = "bishop"
    amazon_side_asn = 64512
    blackhole_cidrs = ["172.16.8.0/24"]
    vpcs            = module.vpcs
  }
}

Networking Trifecta Demo

Blog Post: Terraform Networking Trifecta

Main:

• Networking Trifecta Demo
• See Trifecta Demo Time for instructions.

Requirements

Name	Version
terraform	>=1.3
aws	>=4.20

Providers

Name	Version
aws	>=4.20

Modules

Name	Source	Version
this_generate_routes_to_other_vpcs	./modules/generate_routes_to_other_vpcs	n/a

Resources

Name	Type
aws_ec2_transit_gateway.this	resource
aws_ec2_transit_gateway_route.this_blackholes	resource
aws_ec2_transit_gateway_route_table.this	resource
aws_ec2_transit_gateway_route_table_association.this	resource
aws_ec2_transit_gateway_route_table_propagation.this	resource
aws_ec2_transit_gateway_vpc_attachment.this	resource
aws_route.this_vpc_routes_to_other_vpcs	resource
aws_caller_identity.this	data source
aws_region.this	data source

Inputs

Name	Description	Type	Default	Required
centralized_router	Centralized Router configuration	object({ name = string amazon_side_asn = number blackhole_cidrs = optional(list(string), []) vpcs = optional(map(object({ account_id = string full_name = string id = string name = string network_cidr = string private_route_table_ids = list(string) public_route_table_ids = list(string) public_special_subnet_ids = list(string) region = string })), {}) })	n/a	yes
env_prefix	prod, stage, test	string	n/a	yes
region_az_labels	Region and AZ names mapped to short naming conventions for labeling	map(string)	n/a	yes
tags	Additional Tags	map(string)	{}	no

Outputs

Name	Description
account_id	n/a
amazon_side_asn	n/a
blackhole_cidrs	n/a
full_name	n/a
id	n/a
name	n/a
region	n/a
route_table_id	n/a
vpc	n/a