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# AWS::NetworkFirewall::Firewall AvailabilityZoneMapping
<a name="aws-properties-networkfirewall-firewall-availabilityzonemapping"></a>

Defines the mapping between an Availability Zone and a firewall endpoint for a transit gateway-attached firewall. Each mapping represents where the firewall can process traffic. You use these mappings when calling `CreateFirewall`, `AssociateAvailabilityZones`, and `DisassociateAvailabilityZones`.

To retrieve the current Availability Zone mappings for a firewall, use `DescribeFirewall`.

## Syntax
<a name="aws-properties-networkfirewall-firewall-availabilityzonemapping-syntax"></a>

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

### JSON
<a name="aws-properties-networkfirewall-firewall-availabilityzonemapping-syntax.json"></a>

```
{
  "[AvailabilityZone](#cfn-networkfirewall-firewall-availabilityzonemapping-availabilityzone)" : String
}
```

### YAML
<a name="aws-properties-networkfirewall-firewall-availabilityzonemapping-syntax.yaml"></a>

```
  [AvailabilityZone](#cfn-networkfirewall-firewall-availabilityzonemapping-availabilityzone): String
```

## Properties
<a name="aws-properties-networkfirewall-firewall-availabilityzonemapping-properties"></a>

`AvailabilityZone`  <a name="cfn-networkfirewall-firewall-availabilityzonemapping-availabilityzone"></a>
The ID of the Availability Zone where the firewall endpoint is located. For example, `us-east-2a`. The Availability Zone must be in the same Region as the transit gateway.  
*Required*: Yes  
*Type*: String  
*Pattern*: `\S+`  
*Minimum*: `1`  
*Maximum*: `128`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)