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# AWS::EC2::TransitGatewayMulticastDomain

Creates a multicast domain using the specified transit gateway.
The transit gateway must be in the available state before you create a domain.
## Syntax

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

```
{
 "Type" : "AWS::EC2::TransitGatewayMulticastDomain",
 "Properties" : {
 "[Options](#cfn-ec2-transitgatewaymulticastdomain-options)" : {{Options}},
 "[Tags](#cfn-ec2-transitgatewaymulticastdomain-tags)" : {{[ Tag, ... ]}},
 "[TransitGatewayId](#cfn-ec2-transitgatewaymulticastdomain-transitgatewayid)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::TransitGatewayMulticastDomain
Properties:
 [Options](#cfn-ec2-transitgatewaymulticastdomain-options): {{
 Options}}
 [Tags](#cfn-ec2-transitgatewaymulticastdomain-tags): {{
 - Tag}}
 [TransitGatewayId](#cfn-ec2-transitgatewaymulticastdomain-transitgatewayid): {{String}}
```
## Properties

`Options` 
The options for the transit gateway multicast domain. 
+ AutoAcceptSharedAssociations (enable \| disable)
+ Igmpv2Support (enable \| disable)
+ StaticSourcesSupport (enable \| disable)
*Required*: No 
*Type*: [Options](aws-properties-ec2-transitgatewaymulticastdomain-options.md) 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`Tags` 
The tags for the transit gateway multicast domain. 
*Required*: No 
*Type*: Array of [Tag](aws-properties-ec2-transitgatewaymulticastdomain-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)
## Return values

### Ref

When you pass the logical ID of this resource to the intrinsic `Ref` function, `Ref` returns the transit gateway multicast domain ID. For example: `tgw-mcast-domain-000fb24d04EXAMPLE`.
### 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).
#### 

`CreationTime` 
The time the multicast domain was created.
`State` 
The state of the multicast domain.
`TransitGatewayMulticastDomainArn` 
The Amazon Resource Name (ARN) of the multicast domain.
`TransitGatewayMulticastDomainId` 
The ID of the multicast domain.
## See also

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