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Amazon Web Service (AWS)

Route Table

Network
A route table is a set of rules that is used to determine where traffic from your subnet is directed. It contains all the information required to forward a packet along the best path toward its destination.
aws_route_table
Route Table
attributes:
  • vpc_id - (Required) The VPC ID.
  • route - (Optional) A list of route objects. Their keys are documented below. This argument is processed in attribute-as-blocks mode. This means that omitting this argument is interpreted as ignoring any existing routes. To remove all managed routes an empty list should be specified. See the example above.
  • tags - (Optional) A map of tags to assign to the resource. If configured with a provider default_tags configuration block present, tags with matching keys will overwrite those defined at the provider-level.
  • propagating_vgws - (Optional) A list of virtual gateways for propagation.

route Argument Reference

This argument is processed in attribute-as-blocks mode.

One of the following destination arguments must be supplied:

  • cidr_block - (Required) The CIDR block of the route.
  • ipv6_cidr_block - (Optional) The Ipv6 CIDR block of the route.
  • destination_prefix_list_id - (Optional) The ID of a managed prefix list destination of the route.

One of the following target arguments must be supplied:

  • carrier_gateway_id - (Optional) Identifier of a carrier gateway. This attribute can only be used when the VPC contains a subnet which is associated with a Wavelength Zone.
  • core_network_arn - (Optional) The Amazon Resource Name (ARN) of a core network.
  • egress_only_gateway_id - (Optional) Identifier of a VPC Egress Only Internet Gateway.
  • gateway_id - (Optional) Identifier of a VPC internet gateway or a virtual private gateway.
  • instance_id - (Optional, Deprecated use network_interface_id instead) Identifier of an EC2 instance.
  • local_gateway_id - (Optional) Identifier of a Outpost local gateway.
  • nat_gateway_id - (Optional) Identifier of a VPC NAT gateway.
  • network_interface_id - (Optional) Identifier of an EC2 network interface.
  • transit_gateway_id - (Optional) Identifier of an EC2 Transit Gateway.
  • vpc_endpoint_id - (Optional) Identifier of a VPC Endpoint.
  • vpc_peering_connection_id - (Optional) Identifier of a VPC peering connection.

Note that the default route, mapping the VPC's CIDR block to "local", is created implicitly and cannot be specified.

Associating resources with a
Route Table
Resources do not "belong" to a
Route Table
Rather, one or more Security Groups are associated to a resource.
Create
Route Table
via Terraform:
The following HCL creates a route table for the specified VPC
Syntax:

resource "aws_route_table" "example" {
 vpc_id = aws_vpc.example.id

 route {
   cidr_block = "10.0.1.0/24"
   gateway_id = aws_internet_gateway.example.id
 }

 route {
   ipv6_cidr_block        = "::/0"
   egress_only_gateway_id = aws_egress_only_internet_gateway.example.id
 }

 tags = {
   Name = "example"
 }
}

Create
Route Table
via CLI:
Parametres:

create-route-table
[--dry-run | --no-dry-run]
--vpc-id <value>
[--tag-specifications <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]
[--no-cli-pager]
[--cli-auto-prompt]
[--no-cli-auto-prompt]

Example:

aws ec2 create-route-table --vpc-id vpc-a01106c2

Best Practices for
Route Table

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