# Transit gateway registrations in AWS Global Networks for Transit Gateways
<a name="tgw-registrations"></a>

You can register your existing transit gateways with a global network. Any transit gateway attachments (such as VPCs, VPN connections, and Direct Connect gateways) are automatically included in your global network. 

## Transit gateway limitations
<a name="tgw-limitations"></a>

Note the following about registering transit gateways in a global network:
+ A transit gateway must first be created in Amazon Virtual Private Cloud (VPC) before it can be registered in a global network. For more information about transit gateways and creating one, see [Transit gateways](https://docs.aws.amazon.com/vpc/latest/tgw/tgw-transit-gateways.html) in the *Amazon VPC Transit Gateways User Guide*.
+ You can have multiple global networks, but you can only register one transit gateway with one global network. 
+ You can register transit gateways that are in the same AWS account as the global network.
+ You cannot create, delete, or modify your transit gateways and their attachments using the Network Manager console or APIs. To work with transit gateways, use the Amazon VPC console or the Amazon EC2 APIs.

**Topics**
+ [Transit gateway limitations](#tgw-limitations)
+ [Register a transit gateway](register-tgw.md)
+ [View registered transit gateways](view-registered-tgws.md)
+ [Deregister a transit gateway](deregister-tgw.md)

# Register a transit gateway using AWS Network Manager
<a name="register-tgw"></a>

Register a transit gateway created using Amazon Virtual Private Cloud with your AWS global network using either the Network Manager console or using the CLI. You cannot register a transit gateway with more than one global network.

**To register a transit gateway**

1. Access the Network Manager console at [https://console.aws.amazon.com/networkmanager/home/](https://console.aws.amazon.com/networkmanager/home).

1. Under **Connectivity**, choose **Global Networks**.

1. On the **Global networks** page, choose the global network ID.

1. In the navigation pane, choose **Transit gateways**., and then choose **Register transit gateway**.

1. (Optional) If your account is enabled for multi-account access, from the **Select account** dropdown list choose the account you want to register transit gateways from. 

   The **Select transit gateway to register** section populates with that account's transit gateways.

1. Choose one or more transit gateways, and then choose **Register transit gateway**.

**To register a transit gateway using the AWS CLI**  
Use the [register-transit-gateway](https://docs.aws.amazon.com/cli/latest/reference/networkmanager/register-transit-gateway.html) command.

# View registered transit gateways using AWS Network Manager
<a name="view-registered-tgws"></a>

View a transit gateway registered with your AWS global network using either the Network Manager console or using the CLI. 

**To access your registered transit gateways**

1. Access the Network Manager console at [https://console.aws.amazon.com/networkmanager/home/](https://console.aws.amazon.com/networkmanager/home).

1. Under **Connectivity**, choose **Global Networks**.

1. On the **Global networks** page, choose the global network ID.

1. In the navigation pane, choose **Transit gateways**.

1. The **Transit gateways** page lists your registered transit gateways. Choose the ID of transit gateway to view its details.

**To view your registered transit gateways using the AWS CLI**  
Use the [get-transit-gateway-registrations](https://docs.aws.amazon.com/cli/latest/reference/networkmanager/get-transit-gateway-registrations.html) command.

# Deregister a transit gateway using AWS Network Manager
<a name="deregister-tgw"></a>

Deregister a transit gateway from a global network using either the Network Manager console or using the CLI. Once deregistered, you can re-register this transit gateway with the same global network or with a different global network.

**To deregister a transit gateway**

1. Access the Network Manager console at [https://console.aws.amazon.com/networkmanager/home/](https://console.aws.amazon.com/networkmanager/home).

1. Under **Connectivity**, choose **Global Networks**.

1. On the **Global networks** page, choose the global network ID.

1. In the navigation pane, choose **Transit gateways**. 

1. Select your transit gateway, and choose **Deregister**.

**To deregister a transit gateway using the AWS CLI**  
Use the [deregister-transit-gateway](https://docs.aws.amazon.com/cli/latest/reference/networkmanager/deregister-transit-gateway.html) command.