EC2 InvalidTransitGatewayRouteTablePropagationID.Malformed error encountered when working with AWS EC2.

What is EC2 InvalidTransitGatewayRouteTablePropagationID.Malformed error encountered when working with AWS EC2.

Understanding AWS EC2 and Transit Gateways

AWS Elastic Compute Cloud (EC2) 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 components you might interact with when using EC2 is the Transit Gateway, which allows you to connect your Amazon Virtual Private Clouds (VPCs) and on-premises networks through a central hub.

Identifying the Symptom

When working with AWS Transit Gateways, you might encounter the error code InvalidTransitGatewayRouteTablePropagationID.Malformed. This error typically appears when attempting to manage route table propagations within your transit gateway setup.

What You Observe

While executing commands or using the AWS Management Console to manage your transit gateway route table propagations, you receive an error message indicating that the propagation ID is malformed.

Explaining the Issue

The error InvalidTransitGatewayRouteTablePropagationID.Malformed suggests that the propagation ID you provided does not match the expected format. Each transit gateway route table propagation has a unique identifier, and AWS expects this identifier to follow a specific pattern.

Common Causes

This issue often arises due to typographical errors, incorrect copy-pasting of IDs, or using an ID from a different context or service.

Steps to Fix the Issue

To resolve the InvalidTransitGatewayRouteTablePropagationID.Malformed error, follow these steps:

1. Verify the Propagation ID

Ensure that the propagation ID you are using is correct. You can retrieve the correct ID by listing your current transit gateway route table propagations. Use the following AWS CLI command:

aws ec2 describe-transit-gateway-route-table-propagations --transit-gateway-route-table-id <your-route-table-id>

Replace <your-route-table-id> with your actual transit gateway route table ID.

2. Check the Format

Ensure that the propagation ID follows the correct format. Typically, AWS IDs are alphanumeric and follow a specific pattern (e.g., tgw-rtb-xxxxxxxx).

3. Use the AWS Management Console

If you are unsure about the correct ID, navigate to the AWS Management Console, go to the Transit Gateway section, and manually verify the propagation IDs listed under your route tables.

4. Update Your Scripts or Commands

Once you have verified the correct ID, update your scripts or commands to use the correct propagation ID. Double-check for any typographical errors.

Additional Resources

For more information on managing transit gateways and route tables, refer to the following resources:

AWS Transit Gateway Documentation AWS EC2 Overview AWS CLI Command Reference