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# AWS::EC2::TransitGatewayConnect TransitGatewayConnectOptions

Describes the Connect attachment options.
## Syntax

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

```
{
 "[Protocol](#cfn-ec2-transitgatewayconnect-transitgatewayconnectoptions-protocol)" : {{String}}
}
```
### YAML

```
 [Protocol](#cfn-ec2-transitgatewayconnect-transitgatewayconnectoptions-protocol): {{String}}
```
## Properties

`Protocol` 
The tunnel protocol. 
*Required*: No 
*Type*: String 
*Allowed values*: `gre` 
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