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::NetworkInterfaceAttachment

Attaches an elastic network interface (ENI) to an Amazon EC2 instance. You can use this resource type to attach additional network interfaces to an instance without interruption.
## Syntax

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

```
{
 "Type" : "AWS::EC2::NetworkInterfaceAttachment",
 "Properties" : {
 "[DeleteOnTermination](#cfn-ec2-networkinterfaceattachment-deleteontermination)" : {{Boolean}},
 "[DeviceIndex](#cfn-ec2-networkinterfaceattachment-deviceindex)" : {{String}},
 "[EnaQueueCount](#cfn-ec2-networkinterfaceattachment-enaqueuecount)" : {{Integer}},
 "[EnaSrdSpecification](#cfn-ec2-networkinterfaceattachment-enasrdspecification)" : {{EnaSrdSpecification}},
 "[InstanceId](#cfn-ec2-networkinterfaceattachment-instanceid)" : {{String}},
 "[NetworkInterfaceId](#cfn-ec2-networkinterfaceattachment-networkinterfaceid)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::NetworkInterfaceAttachment
Properties:
 [DeleteOnTermination](#cfn-ec2-networkinterfaceattachment-deleteontermination): {{Boolean}}
 [DeviceIndex](#cfn-ec2-networkinterfaceattachment-deviceindex): {{String}}
 [EnaQueueCount](#cfn-ec2-networkinterfaceattachment-enaqueuecount): {{Integer}}
 [EnaSrdSpecification](#cfn-ec2-networkinterfaceattachment-enasrdspecification): {{
 EnaSrdSpecification}}
 [InstanceId](#cfn-ec2-networkinterfaceattachment-instanceid): {{String}}
 [NetworkInterfaceId](#cfn-ec2-networkinterfaceattachment-networkinterfaceid): {{String}}
```
## Properties

`DeleteOnTermination` 
Whether to delete the network interface when the instance terminates. By default, this value is set to `true`. 
*Required*: No 
*Type*: Boolean 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`DeviceIndex` 
The network interface's position in the attachment order. For example, the first attached network interface has a `DeviceIndex` of 0. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`EnaQueueCount` 
The number of ENA queues created with the instance. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`EnaSrdSpecification` 
Configures ENA Express for the network interface that this action attaches to the instance. 
*Required*: No 
*Type*: [EnaSrdSpecification](aws-properties-ec2-networkinterfaceattachment-enasrdspecification.md) 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`InstanceId` 
The ID of the instance to which you will attach the ENI. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`NetworkInterfaceId` 
The ID of the ENI that you want to attach. 
*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 resource name.
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).
#### 

`AttachmentId` 
The ID of the network interface attachment.
## Examples

### Network interface attachment

The following example attaches `MyNetworkInterface` to `MyInstance`.
#### JSON

```
"NetworkInterfaceAttachment" : {
 "Type" : "AWS::EC2::NetworkInterfaceAttachment",
 "Properties" : {
 "InstanceId" : {"Ref" : "MyInstance"},
 "NetworkInterfaceId" : {"Ref" : "MyNetworkInterface"},
 "DeviceIndex" : "1" 
 }
}
```
#### YAML

```
NetworkInterfaceAttachment:
 Type: AWS::EC2::NetworkInterfaceAttachment
 Properties:
 InstanceId:
 Ref: MyInstance
 NetworkInterfaceId:
 Ref: MyNetworkInterface
 DeviceIndex: 1
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