Best Practices for Resolving YANG Errors

Oct 13, 2025 by talynt.org 103 views

Introduction

When working with YANG models, it's not uncommon to encounter errors during validation. These errors can be frustrating, especially when they seem to arise from nowhere. In this article, we'll delve into the world of YANG errors, specifically those encountered in RC and 2.5.0 versions of the tapi-connectivity.yang model. We'll explore the root causes of these errors and discuss the solution that was implemented to resolve them.

Understanding YANG Errors

YANG (YANG is a data modeling language used to define the contents of a conceptual data store, which is used in network management protocols such as NETCONF and RESTCONF) is a powerful tool for defining data models. However, like any complex system, it's not immune to errors. When a YANG model is validated, it's checked for consistency and correctness. If the model contains errors, the validation process will fail, and an error message will be generated.

The tapi-connectivity.yang Model

The tapi-connectivity.yang model is a critical component of the TAPI (Telecom Application Programming Interface) framework. It provides a standardized way of defining connectivity between different network elements. The model is used to configure and manage network connections, which is essential for ensuring reliable and efficient communication.

The Errors

When performing a validation on the tapi-connectivity.yang model, the following errors were encountered:

tapi-connectivity.yang:381: error: the path for connection-end-point-uuid is config but refers to a non-config leaf "uuid" defined at tapi-connectivity.yang:158 (at tapi-common.yang:184)
tapi-connectivity.yang:402: error: the path for switch-control-uuid is config but refers to a non-config leaf "uuid" defined at tapi-connectivity.yang:151 (at tapi-common.yang:184)
tapi-connectivity.yang:412: error: the path for switch-local-id is config but refers to a non-config leaf "local-id" defined at tapi-connectivity.yang:151 (at tapi-common.yang:209)
tapi-connectivity.yang:422: error: the path for route-local-id is config but refers to a non-config leaf "local-id" defined at tapi-connectivity.yang:151 (at tapi-common.yang:209)

These errors indicate that there are inconsistencies in the model. Specifically, the errors suggest that certain paths in the model are marked as "config" but refer to non-config leaf nodes.

The Solution

To resolve these errors, the relevant leaves were marked as "config-false". This change ensures that the paths in the model are consistent and accurate. By making this change, the model is now free from errors, and it can be used to configure and manage network connections without any issues.

Conclusion

In conclusion, YANG errors can be frustrating and time-consuming to resolve. However, with the right tools and knowledge, it's possible to identify and fix these errors. In this article, we explored the tapi-connectivity.yang model and the errors that were encountered during validation. We discussed the root causes of these errors and the solution that was implemented to resolve them. By learning from these errors, we can improve the quality and accuracy of our YANG models, which is essential for ensuring reliable and efficient communication in network management protocols.

Future Developments

A new version of the YANG model will be pushed to the nigel-r-davis fork shortly. This updated version will include the changes made to resolve the errors discussed in this article. The updated model will provide a more accurate and consistent representation of the tapi-connectivity.yang model, which will help to ensure reliable and efficient communication in network management protocols.

Best Practices for Resolving YANG Errors

When working with YANG models, it's essential to follow best practices to ensure that your models are accurate and consistent. Here are some tips to help you resolve YANG errors:

Use a YANG editor: A YANG editor can help you identify and fix errors in your model. These editors provide features such as syntax highlighting, code completion, and validation.
Validate your model: Validation is a critical step in ensuring that your model is accurate and consistent. Use a YANG validator to check your model for errors.
Use a YANG compiler: A YANG compiler can help you generate code from your YANG model. This code can be used to implement the model in a programming language.
Test your model: Testing is an essential step in ensuring that your model is accurate and consistent. Use a YANG tester to test your model and identify any errors.

By following these best practices, you can ensure that your YANG models are accurate and consistent, which is essential for ensuring reliable and efficient communication in network management protocols.

Introduction

In our previous article, we explored the YANG errors encountered in RC and 2.5.0 versions of the tapi-connectivity.yang model. We discussed the root causes of these errors and the solution that was implemented to resolve them. In this article, we'll provide a Q&A section to help you better understand the YANG errors and how to resolve them.

Q&A

Q: What are YANG errors?

A: YANG errors are inconsistencies in a YANG model that can cause validation to fail. These errors can arise from a variety of sources, including incorrect syntax, missing or duplicate definitions, and inconsistencies between different parts of the model.

Q: What is the tapi-connectivity.yang model?

A: The tapi-connectivity.yang model is a critical component of the TAPI (Telecom Application Programming Interface) framework. It provides a standardized way of defining connectivity between different network elements.

Q: What are the errors encountered in the tapi-connectivity.yang model?

A: The errors encountered in the tapi-connectivity.yang model include:

tapi-connectivity.yang:381: error: the path for connection-end-point-uuid is config but refers to a non-config leaf "uuid" defined at tapi-connectivity.yang:158 (at tapi-common.yang:184)
tapi-connectivity.yang:402: error: the path for switch-control-uuid is config but refers to a non-config leaf "uuid" defined at tapi-connectivity.yang:151 (at tapi-common.yang:184)
tapi-connectivity.yang:412: error: the path for switch-local-id is config but refers to a non-config leaf "local-id" defined at tapi-connectivity.yang:151 (at tapi-common.yang:209)
tapi-connectivity.yang:422: error: the path for route-local-id is config but refers to a non-config leaf "local-id" defined at tapi-connectivity.yang:151 (at tapi-common.yang:209)

Q: How were the errors resolved?

A: The errors were resolved by marking the relevant leaves as "config-false". This change ensures that the paths in the model are consistent and accurate.

Q: What is the significance of the "config" and "config-false" keywords?

A: The "config" keyword is used to indicate that a leaf or container is configurable. The "config-false" keyword is used to indicate that a leaf or container is not configurable.

Q: How can I prevent YANG errors in my own models?

A: To prevent YANG errors in your own models, follow these best practices:

Use a YANG editor to identify and fix errors in your model.
Validate your model using a YANG validator.
Use a YANG compiler to generate code from your YANG model.
Test your model using a YANG tester.

Q: What are some common causes of YANG errors?

A: Some common causes of YANG errors include:

Incorrect syntax
Missing or duplicate definitions
Inconsistencies between different parts of the model
Incorrect use of keywords such as "config" and "config-false"

Q: How can I troubleshoot YANG errors?

A: To troubleshoot YANG errors, follow these steps:

Review the error message to identify the source of the error.
Use a YANG editor to identify and fix errors in your model.
Validate your model using a YANG validator.
Use a YANG compiler to generate code from your YANG model.
Test your model using a YANG tester.

Conclusion

In conclusion, YANG errors can be frustrating and time-consuming to resolve. However, by following best practices and using the right tools, you can identify and fix errors in your YANG models. In this article, we provided a Q&A section to help you better understand the YANG errors and how to resolve them. We hope this article has been helpful in your journey to mastering YANG models.