Introduction Interface MTU (Maximum Transmission Unit) mismatches are a common cause of packet drops and network performance degradation. Identifying and resolving MTU mismatches across a multi-vendor environment (Cisco, Arista, Palo Alto, Fortinet) ensures consistent communication and avoids fragmentation issues. In this 101 Days of pyATS […]
![[Day #42 PyATS Series] IP SLA Monitoring Automation (Cisco-Specific) Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-42-PyATS-Series-IP-SLA-Monitoring-Automation-Cisco-Specific-Using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction on the Key Points In modern enterprise networks, ensuring end-to-end service availability and performance is critical. Cisco’s IP SLA (Service Level Agreement) feature allows network engineers to measure parameters such as latency, jitter, packet loss, and response times between devices. Traditionally, IP SLA statistics […]
Introduction on the Key Points Neighbor discovery protocols like CDP (Cisco Discovery Protocol) and LLDP (Link Layer Discovery Protocol) play a crucial role in identifying directly connected devices in a network. As a Python for Network Engineer practitioner, automating neighbor validation ensures accurate documentation, topology […]
![[Day #41 PyATS Series] Validate Routing Table Entries Across Cisco/Arista/Palo Alto/Fortigate Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-41-PyATS-Series-Validate-Routing-Table-Entries-Across-Cisco-AristaPalo-AltoFortigate-Using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction on the Key Points Routing tables are the backbone of IP packet forwarding. Any mismatch, stale route, or missing entry can lead to packet drops, suboptimal routing, or even complete network outages. Traditionally, network engineers log in to each device and manually inspect the […]
![[Day #71 Pyats Series] Create CI/CD pipeline with pyATS (Jenkins + GitLab) using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Create-CI-CD-pipeline-with-pyATS-Jenkins-GitLab-using-pyATS-for-Cisco.png)
Introduction on the Key Points In today’s fast-paced networking world, automation is no longer a luxury—it’s a necessity.When we talk about Python for Network Engineer workflows, pyATS stands out as Cisco’s powerful network testing and validation framework that fits beautifully into a CI/CD pipeline. Imagine […]
![[Day #33 PyATS Series] VRF Configuration Consistency Check Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-33-PyATS-Series-VRF-Configuration-Consistency-Check-Using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction Maintaining Virtual Routing and Forwarding (VRF) configuration consistency is critical in multi-tenant or service provider networks. Misaligned VRF configurations can lead to routing leaks, traffic blackholing, and connectivity issues between VRF instances. Traditionally, network engineers manually log into each device to verify VRF names, […]
![[Day #32 PyATS Series] Tracing End-to-End Path (Multi-Hop Traceroute Validation) Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-32-PyATS-Series-Tracing-End-to-End-Path-Multi-Hop-Traceroute-Validation-Using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction End-to-end path validation is a crucial part of network troubleshooting and performance analysis. Traceroute is one of the most widely used diagnostic tools to trace the path packets take across multiple hops in a network. However, manually running traceroute on individual devices and comparing […]
![[Day #31 PyATS Series] Detect VLAN Mismatches on Trunk Links Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-31-PyATS-Series-Detect-VLAN-Mismatches-on-Trunk-Links-Using-pyATS-for-Cisco.png)
Introduction Detecting VLAN mismatches on trunk links is crucial for maintaining seamless Layer 2 connectivity across a network. A VLAN mismatch can lead to traffic drops, inconsistent broadcast domains, and ultimately network instability. Traditional troubleshooting involves manually logging into each switch and comparing trunk configurations—a […]
![[Day #30 PyATS Series] Checking STP Root Bridge Across Cisco Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day-30-PyATS-Series-Checking-STP-Root-Bridge-Across-Cisco-Using-pyATS-for-Cisco.png)
Introduction Spanning Tree Protocol (STP) is a fundamental Layer 2 protocol used to prevent loops in switched networks. One critical aspect of STP is determining the Root Bridge, which plays a central role in defining the active forwarding paths. Manually verifying STP root bridges across […]
![[Day #29 PyATS Series] Loopback IP Reachability Validation (Ping Tests) Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/08/Day29-PyATS-Series-Loopback-IP-Reachability-Validation-Ping-Tests-Using-pyATS-for-Cisco.png)
Introduction In large-scale enterprise and service provider networks, Loopback interfaces play a crucial role in routing protocols, management access, and network stability. Ensuring continuous reachability of loopback IPs is a key part of proactive network monitoring. Manual ping testing can be tedious and prone to […]
