Create and manage attachments

An attachment refers to the source/destination of packets in a transit gateway, and you can select Subnets in each AZ within a VPC to configure the system's Multi-AZ high availability. You can control traffic centrally by creating a transit gateway attachment and connecting (Associating) it to a route table.
To create and manage attachments, please follow these guidelines.

Permissions

Only Project Admin can create and manage the attachments.

Create attachment

The following is to create a new attachment.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. Check the current list of created attachments in the Attachment tab and click the [Create attachment] button.

3. Enter the basic information for the attachment to create, and click the [Apply] button.

   Create attachment

   Category	Description
   Transit Gateway	The target Transit Gateway for the resource to be attached - Owner: Transit Gateway created directly - Shared: Gateway received through sharing
   Resource	The resource to be attached to the transit gateway - As of September 2023, only VPC can be selected.

Manage attachment

View list of attachments

You can view the list of created attachments.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. Check the current list of created attachments in the Attachment tab.

   View list of attachments

   Category	Description
   Attachment ID	The unique ID of the attachment
   Status	The status of the attachment - Creating: Attachment is being created - Pending Approve: Waiting for approval - Updating: Attachment is being updated - Deleting: Attachment is being deleted - Active: Attachment provisioning successful - Error: Attachment error occurred
   Transit Gateway name	The name of the Transit Gateway
   Transit Gateway ID	The unique ID of the Transit Gateway
   Resource name	The name of the resource connected to the attachment
   Resource ID	The unique ID of the resource connected to the attachment
   Creation date	The date the attachment was created
   Attachment owner project ID	Displays the project ID of the attachment owner and sharing status - Owner: When the attachment is created directly - Shared: When the attachment is viewed from a project that shares the Transit Gateway to which it is connected
   [More] icon	Provides the following functions - Modify - Approve - Delete

View basic information of attachment

You can check basic information such as the status and creation date of the attachment.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. In the Attachment tab, select the attachment from the list to check detailed information.

3. Check the basic information of the attachment.

   Attachment Details

   Category	Description
   Status	The status of the attachment - Creating: Attachment is being created - Pending Approve: Waiting for approval - Updating: Attachment is being updated - Deleting: Attachment is being deleted - Active: Attachment provisioning successful - Error: Attachment error occurred
   Creation date	The date the attachment was created
   Attachment owner project ID	Displays the project ID of the attachment owner and sharing status - Owner: When the attachment is created directly - Shared: When viewed from a project that shares the Transit Gateway to which the attachment is connected

View detailed information of attachment (By tab)

You can check the detailed information of the attachment in each tab.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. In the Attachment tab, select the attachment from the list to check detailed information.

3. Check the detailed information of the attachment in each tab.

   Details Tab

   Details tab

   Category	Description
   Attachment ID	The unique ID of the attachment
   Transit gateway name	The name of the transit gateway
   Transit gateway ID	The unique ID of the transit gateway
   Transit Gateway owner project ID	The ID of the project that created the Transit Gateway
   Route table name	The name of the route table
   Route table ID	The unique ID of the route table
   Resource type	The type of the attachment resource
   Resource name	The name of the attachment resource
   Resource ID	The unique ID of the attachment resource
   IP CIDR block	The IP CIDR block of the attachment resource

   Resource Tab

   Category	Description
   VPC name	The name of the VPC
   VPC ID	The unique ID of the VPC
   Subnet name	The name of the subnet
   Subnet ID	The unique ID of the subnet
   Status	The status of the subnet
   IP CIDR block	The IP CIDR block of the subnet
   Availability zone	The availability zone where the subnet is located

   info

   • The Transit Gateway owner cannot view resource information in the attachment details of participants.

Modify attachment

The following is to modify an attachment.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. In the Attachment tab, select the [More] icon > Modify attachment.

3. In the pupup window, set the subnets by AZ and click the [Apply] button.

   Modify attachment

Approve attachment

You can approve an attachment.

info

The [Approve] button is only displayed when the Sharing acceptance method option is manual and the attachment created in another project is in Pending Approve state.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. In the Attachment tab, select the [More] icon > Approve.

3. In the popup window, click the [Approve] button.

Delete attachment

The method for deleting an attachment is as follows.

1. Go to KakaoCloud Console > Beyond Networking Service > Transit Gateway.

2. In the Attachment tab, select the [More] icon > Delete attachment.

3. In the popup window, enter Permanently delete and click the [Delete] button.