This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::TransitGatewayRoute

Specifies a static route for a transit gateway route table.
## Syntax

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

```
{
 "Type" : "AWS::EC2::TransitGatewayRoute",
 "Properties" : {
 "[Blackhole](#cfn-ec2-transitgatewayroute-blackhole)" : {{Boolean}},
 "[DestinationCidrBlock](#cfn-ec2-transitgatewayroute-destinationcidrblock)" : {{String}},
 "[TransitGatewayAttachmentId](#cfn-ec2-transitgatewayroute-transitgatewayattachmentid)" : {{String}},
 "[TransitGatewayRouteTableId](#cfn-ec2-transitgatewayroute-transitgatewayroutetableid)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::TransitGatewayRoute
Properties:
 [Blackhole](#cfn-ec2-transitgatewayroute-blackhole): {{Boolean}}
 [DestinationCidrBlock](#cfn-ec2-transitgatewayroute-destinationcidrblock): {{String}}
 [TransitGatewayAttachmentId](#cfn-ec2-transitgatewayroute-transitgatewayattachmentid): {{String}}
 [TransitGatewayRouteTableId](#cfn-ec2-transitgatewayroute-transitgatewayroutetableid): {{String}}
```
## Properties

`Blackhole` 
Indicates whether to drop traffic that matches this route. 
*Required*: No 
*Type*: Boolean 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`DestinationCidrBlock` 
The CIDR block used for destination matches. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`TransitGatewayAttachmentId` 
The ID of the attachment. 
*Required*: No 
*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 transit gateway 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.
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

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