![[Day #67 PyATS Series] Automating MPLS LSP Path Validation Using pyATS for Cisco](https://networkjourney.com/wp-content/uploads/2025/09/Day-67-PyATS-Series-Automating-MPLS-LSP-Path-Validation-Using-pyATS-for-Cisco.png)
Introduction — key points MPLS LSPs (Label Switched Paths) are the backbone of many carrier and service provider networks, and they’re increasingly used in large enterprise backbones for traffic engineering and service chaining. Ensuring an LSP actually follows the expected sequence of nodes (and that […]
![[Day #66 PyATS Series] DHCP Lease Monitoring Across Vendors Using pyATS for Cisco](https://networkjourney.com/wp-content/uploads/2025/09/Day-66-PyATS-Series-DHCP-Lease-Monitoring-Across-Vendors-Using-pyATS-for-Cisco.png)
Introduction — key points DHCP is the lifeblood of many access networks — it hands out IPs, lease timers, options (DNS, gateway), and when it misbehaves your users complain fast. Monitoring DHCP lease state and bindings across a large, multi-vendor estate is a recurrent operational […]
Introduction — key points SNMP traps are still a cornerstone of network monitoring: they provide near-real-time notifications for link events, process failures, environmental alarms and security events. But traps are UDP-based, vendor-specific, and frequently misconfigured — so testing trap delivery and parsing becomes essential when […]
![[Day #58 PyATS Series] Validate Dynamic Routing After Topology Changes Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-58-PyATS-Series-Validate-Dynamic-Routing-After-Topology-Changes-Using-pyATS-for-Cisco.png)
Introduction — key points When you change topology (link shutdown, switch replacement, LAG tweak, or routing policy updates) dynamic routing protocols—OSPF and BGP—need to reconverge. A manual check (show ip route, show ip ospf neighbor, show ip bgp summary) on one device is insufficient for […]
![[Day #61 PyATS Series] Automating ISSU (In-Service Software Upgrade) Validation Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-61-PyATS-Series-Automating-ISSU-In-Service-Software-Upgrade-Validation-Using-pyATS-for-Cisco.png)
Introduction — key points In-Service Software Upgrade (ISSU) is a powerful technique that allows upgrading the software on clustered or redundant network devices with minimal traffic disruption. But ISSU is risky: subtle control-plane events, process crashes, or platform incompatibilities can cause outages that are hard […]
![[Day #52 PyATS Series] Writing pyATS Plugins for Vendor-Specific Features using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-52-PyATS-Series-Writing-pyATS-Plugins-for-Vendor-Specific-Features-using-pyATS-for-Cisco.png)
Introduction — key points As a Python for Network Engineer, you’ll hit the same problem repeatedly: built-in pyATS/Genie capabilities are great, but your network has vendor-specific commands, telemetry, or workflows that need reusable automation. Instead of copying ad-hoc scripts into jobs, you should build plugins […]
![[Day #48 PyATS Series] EIGRP Neighbor Health Check (Cisco IOS-XE / IOS-XR) using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-48-PyATS-Series-EIGRP-Neighbor-Health-Check-Cisco-IOS-XE-IOS-XR-using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction — key points (what you’ll learn) EIGRP neighbor stability is critical for routing convergence and network stability. Small changes in SRTT, increasing retransmissions, or flapping adjacencies can lead to route withdrawal and traffic disruption. In this masterclass you will learn how to: This is […]
![[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 […]
![[Day #59 PyATS Series] Detect Split-Horizon Issues in Large Networks Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-59-PyATS-Series-Detect-Split-Horizon-Issues-in-Large-Networks-Using-pyATS-for-Cisco.png)
Introduction — key points Split-horizon and related route-advertisement problems are subtle but catastrophic in large networks: routes sometimes don’t propagate where they should, or — worse — are advertised back like a boomerang creating loops. Detecting these issues at scale requires automation, consistent evidence (raw […]
