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::TransitGatewayVpcAttachment

Specifies a VPC attachment.
## Syntax

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

```
{
 "Type" : "AWS::EC2::TransitGatewayVpcAttachment",
 "Properties" : {
 "[AddSubnetIds](#cfn-ec2-transitgatewayvpcattachment-addsubnetids)" : {{[ String, ... ]}},
 "[Options](#cfn-ec2-transitgatewayvpcattachment-options)" : {{Options}},
 "[RemoveSubnetIds](#cfn-ec2-transitgatewayvpcattachment-removesubnetids)" : {{[ String, ... ]}},
 "[SubnetIds](#cfn-ec2-transitgatewayvpcattachment-subnetids)" : {{[ String, ... ]}},
 "[Tags](#cfn-ec2-transitgatewayvpcattachment-tags)" : {{[ Tag, ... ]}},
 "[TransitGatewayId](#cfn-ec2-transitgatewayvpcattachment-transitgatewayid)" : {{String}},
 "[VpcId](#cfn-ec2-transitgatewayvpcattachment-vpcid)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::TransitGatewayVpcAttachment
Properties:
 [AddSubnetIds](#cfn-ec2-transitgatewayvpcattachment-addsubnetids): {{
 - String}}
 [Options](#cfn-ec2-transitgatewayvpcattachment-options): {{
 Options}}
 [RemoveSubnetIds](#cfn-ec2-transitgatewayvpcattachment-removesubnetids): {{
 - String}}
 [SubnetIds](#cfn-ec2-transitgatewayvpcattachment-subnetids): {{
 - String}}
 [Tags](#cfn-ec2-transitgatewayvpcattachment-tags): {{
 - Tag}}
 [TransitGatewayId](#cfn-ec2-transitgatewayvpcattachment-transitgatewayid): {{String}}
 [VpcId](#cfn-ec2-transitgatewayvpcattachment-vpcid): {{String}}
```
## Properties

`AddSubnetIds` 
The IDs of one or more subnets to add. You can specify at most one subnet per Availability Zone. 
*Required*: No 
*Type*: Array of String 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`Options` 
The VPC attachment options. 
*Required*: No 
*Type*: [Options](aws-properties-ec2-transitgatewayvpcattachment-options.md) 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`RemoveSubnetIds` 
The IDs of one or more subnets to remove. 
*Required*: No 
*Type*: Array of String 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`SubnetIds` 
The IDs of the subnets. 
*Required*: Yes 
*Type*: Array of String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`Tags` 
The tags for the VPC attachment. 
*Required*: No 
*Type*: Array of [Tag](aws-properties-ec2-transitgatewayvpcattachment-tag.md) 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`TransitGatewayId` 
The ID of the transit gateway. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`VpcId` 
The ID of the VPC. 
*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 attachment.
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).
### Fn::GetAtt

The `Fn::GetAtt` intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.
For more information about using the `Fn::GetAtt` intrinsic function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html).
#### 

`Id` 
The ID of the attachment.</div><div class="naked_ctrl">
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