![[Day #57 PyATS Series] Change Management Validation for ACL Updates Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-57-PyATS-Series-Change-Management-Validation-for-ACL-Updates-Using-pyATS-for-Cisco.png)
Introduction — key points Access Control Lists (ACLs) are one of the most powerful — and risky — configuration constructs in a network. A misplaced line, wrong sequence number, or an overly-broad permit can either block business traffic or expose services. For any ACL change […]
![[Day #56 PyATS Series] Automating Pre/Post Config Change Checks (Brownfield) Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-56-PyATS-Series-Automating-Pre_Post-Config-Change-Checks-Brownfield-Using-pyATS-for-Cisco.png)
Introduction on the key points When working in a brownfield network, every configuration change carries risk. You must verify what is there now (pre-check), apply a change under controlled conditions, and verify what changed (post-check). Doing this manually is slow and error-prone — especially across […]
