Manage Transit Gateway Attachments | MuleSoft Documentation
# Manage Transit Gateway Attachments
Use Anypoint Runtime Manager to manage transit gateway attachments, such as adding and removing a route from the route table or detaching an Anypoint VPN from a transit gateway.
## Rename a Transit Gateway Attachment
You might want to rename a transit gateway attachment to match the attachment name in AWS.
To rename a transit gateway attachment:
  1. On the **Transit Gateways** page, click the Transit Gateway menu (**…​**) and select **Edit name** :
  2. In the popup window, enter a new name and click **Save**.


## Add a Route to the Transit Gateway Route Table
You might want to add a route to enable a new subnet to be accessible through the transit gateway.
  1. In Anypoint Platform, navigate to **Transit Gateways** > **VPCs** and click **Add Route**.
  2. In the **Add VPC Route** window, use CIDR notation to enter a single subnet for your AWS VPC:
  3. Click **Add Route**.
Anypoint Platform submits the new route to AWS.


When you add a new route, the platform ensures it doesn’t conflict with any existing routes in the VPC, whether they’re static or propagated from a BGP connection. If the new route is a duplicate, either remove the existing route or split the new route into smaller ones to avoid any collisions.   
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When the route addition succeeds, the **Transit Gateways** page shows the **Route added** message and the **Transit Gateways** page shows the route CIDR in the route table.
In the route tables, added routes show **Transit Gateway** as the value in the **Next Hop** column.
Specific routes attached to the transit gateway show under **Transit Gateway Routes**. Other routes in the VPC show under **VPC Routes**.
## Remove a Route from the Transit Gateway Route Table
You might need to remove a route if you no longer want a subnet to be accessible through the transit gateway.
To remove a route:
  1. On the **Transit Gateways** page, in the **VPCs** section, click the **X** icon in the appropriate Transit Gateway route row of the route table:
  2. At the confirmation prompt, click **Remove**.


## Detach an Anypoint VPC from the Transit Gateway
You might need to detach a VPC so that you can reattach it.
Detaching a VPC from a transit gateway also deletes the attachment in AWS. Any apps deployed to the VPC continue to run, but they are no longer connected to your Amazon VPCs and VPNs.
To detach a VPC from the transit gateway:
  1. On the **Transit Gateways** page, click the VPC menu (**…​**) and select **Detach** :
  2. At the confirmation prompt, click **Detach**.
Detaching a VPC might take several minutes.


## Remove an Anypoint VPC from the Transit Gateway
If you reject an attachment in AWS, the VPC attachment appears as `rejected` in Anypoint Platform. In this case, you must remove the attachment before trying to attach it again.
To remove a VPC from the transit gateway:
  1. On the **Transit Gateways** page, click the VPC menu (**…​**) and select **Remove** :
  2. At the confirmation prompt, click **Remove**.
Removing a VPC might take several minutes.
After the VPC is removed, the **Attach VPC** button becomes available.


## Remove a Transit Gateway from Anypoint Platform
You might need to remove a transit gateway if you’ve reached your entitlement limit or you want to switch the connection to a new transit gateway.
If a transit gateway has no VPCs attached, you can remove it from Anypoint Platform.
Removing a transit gateway deletes the resource share in AWS that Anypoint Platform uses to access the transit gateway.   
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To remove a transit gateway from Anypoint Platform:
  1. On the **Transit Gateways** page, click the Transit Gateway menu (**…​**) and select **Remove** :
Anypoint Platform prevents you from removing a transit gateway if it has VPCs attached.
If the **Transit Gateways** page doesn’t list any VPCs, but you can’t delete the transit gateway, the transit gateway might be attached to a VPC that belongs to another business group that you don’t have access to.
  2. At the confirmation prompt, click **Remove**.


## See Also
  * Troubleshoot Transit Gateway Attachments
  * Attach to Transit Gateways
  * Transit Gateway Attachments
  * Virtual Private Cloud
  * Create and Update a VPC for Runtime Manager
  * Grant Permissions and Roles to Users