Amazon EC2 (Elastic Compute Cloud) is a web service that provides resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. One of the key components of EC2 is the Transit Gateway, which acts as a hub to connect your VPCs and on-premises networks.
When working with EC2 Transit Gateway, you might encounter the error: InvalidTransitGatewayRouteTableAssociationID.Malformed. This error indicates that the association ID you provided does not match the expected format.
While attempting to associate a route table with a transit gateway, the operation fails, and you receive the malformed ID error. This prevents the successful routing of traffic through the transit gateway.
The error InvalidTransitGatewayRouteTableAssociationID.Malformed is triggered when the format of the transit gateway route table association ID does not adhere to the required pattern. This could be due to typographical errors or incorrect ID usage.
This issue often arises when there is a manual entry error or when the ID is copied incorrectly from another source. The ID must follow a specific pattern that is unique to AWS resources.
To resolve the InvalidTransitGatewayRouteTableAssociationID.Malformed error, follow these steps:
Ensure that the association ID is correctly formatted. The ID should look similar to tgw-rtb-xxxxxxxx, where xxxxxxxx is a unique identifier. Double-check for any typographical errors.
Use the AWS CLI to list all transit gateway route tables and their associations to find the correct ID:
aws ec2 describe-transit-gateway-route-tables --query 'TransitGatewayRouteTables[*].TransitGatewayRouteTableId'
This command will return a list of route table IDs. Ensure you are using the correct one.
Once you have the correct ID, attempt to associate the route table again using the AWS Management Console or CLI. For CLI, use:
aws ec2 associate-transit-gateway-route-table --transit-gateway-route-table-id tgw-rtb-xxxxxxxx --transit-gateway-attachment-id tgw-attach-yyyyyyyy
Replace tgw-rtb-xxxxxxxx and tgw-attach-yyyyyyyy with your specific IDs.
For more information on managing transit gateways, visit the AWS Transit Gateway Documentation. If you continue to experience issues, consider reaching out to AWS Support for further assistance.
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