This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::ARCRegionSwitch::Plan Lambdas
<a name="aws-properties-arcregionswitch-plan-lambdas"></a>

Configuration for Amazon Lambda functions used in a Region switch plan.

## Syntax
<a name="aws-properties-arcregionswitch-plan-lambdas-syntax"></a>

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

### JSON
<a name="aws-properties-arcregionswitch-plan-lambdas-syntax.json"></a>

```
{
  "[Arn](#cfn-arcregionswitch-plan-lambdas-arn)" : {{String}},
  "[CrossAccountRole](#cfn-arcregionswitch-plan-lambdas-crossaccountrole)" : {{String}},
  "[ExternalId](#cfn-arcregionswitch-plan-lambdas-externalid)" : {{String}}
}
```

### YAML
<a name="aws-properties-arcregionswitch-plan-lambdas-syntax.yaml"></a>

```
  [Arn](#cfn-arcregionswitch-plan-lambdas-arn): {{String}}
  [CrossAccountRole](#cfn-arcregionswitch-plan-lambdas-crossaccountrole): {{String}}
  [ExternalId](#cfn-arcregionswitch-plan-lambdas-externalid): {{String}}
```

## Properties
<a name="aws-properties-arcregionswitch-plan-lambdas-properties"></a>

`Arn`  <a name="cfn-arcregionswitch-plan-lambdas-arn"></a>
The Amazon Resource Name (ARN) of the Lambda function.  
*Required*: No  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`CrossAccountRole`  <a name="cfn-arcregionswitch-plan-lambdas-crossaccountrole"></a>
The cross account role for the configuration.  
*Required*: No  
*Type*: String  
*Pattern*: `^arn:aws[a-zA-Z0-9-]*:iam::[0-9]{12}:role/.+$`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ExternalId`  <a name="cfn-arcregionswitch-plan-lambdas-externalid"></a>
The external ID (secret key) for the configuration.  
*Required*: No  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)