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# AWS::EC2::TransitGatewayRouteTablePropagation

Enables the specified attachment to propagate routes to the specified propagation route table.
For more information about enabling transit gateway route propagation, see [EnableTransitGatewayRouteTablePropagation](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_EnableTransitGatewayRouteTablePropagation.html) in the *Amazon EC2 API Reference*.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "Type" : "AWS::EC2::TransitGatewayRouteTablePropagation",
 "Properties" : {
 "[TransitGatewayAttachmentId](#cfn-ec2-transitgatewayroutetablepropagation-transitgatewayattachmentid)" : {{String}},
 "[TransitGatewayRouteTableId](#cfn-ec2-transitgatewayroutetablepropagation-transitgatewayroutetableid)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::TransitGatewayRouteTablePropagation
Properties:
 [TransitGatewayAttachmentId](#cfn-ec2-transitgatewayroutetablepropagation-transitgatewayattachmentid): {{String}}
 [TransitGatewayRouteTableId](#cfn-ec2-transitgatewayroutetablepropagation-transitgatewayroutetableid): {{String}}
```
## Properties

`TransitGatewayAttachmentId` 
The ID of the attachment. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`TransitGatewayRouteTableId` 
The ID of the propagation route table. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
## Return values

### Ref

When you pass the logical ID of this resource to the intrinsic `Ref` function, `Ref` returns the ID of the transit gateway route table that is propagated.
For more information about using the `Ref` function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html).
## See also

+ [EnableTransitGatewayRouteTablePropagation](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_EnableTransitGatewayRouteTablePropagation.html) in the *Amazon EC2 API Reference*
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