![[Day #94 PyATS Series] Validate IPv6 Neighbor Discovery Tables Using pyATS for Cisco [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/09/Day-94-PyATS-Series-Validate-IPv6-Neighbor-Discovery-Tables-Using-pyATS-for-Cisco-Python-for-Network-Engineer.png)
Introduction on the Key Points In modern network environments, IPv6 is becoming increasingly vital as IPv4 address exhaustion becomes a reality. Ensuring proper IPv6 neighbor discovery (ND) behavior is crucial for maintaining seamless network operations. Today, we will dive deep into automating the validation of […]
![Ticket#10 - NAT Overload Failure: Why Users Couldn't Access the Internet – A Real Fix [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-10.jpg)
Problem Summary In a mid-sized enterprise, users across VLANs suddenly reported that they couldn’t browse the internet or access external services. While internal services like file sharing and internal DNS were operational, anything beyond the firewall was unreachable. Symptoms Observed Root Cause Analysis Initial checks […]
![Ticket#9 - WAN Flap Detection: DMVPN Phase 2 Tunnel Up/Down Issue Fixed [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-9.jpg)
Problem Summary The enterprise monitoring tool detected flapping tunnels between remote branch routers and the HQ hub.Ticket Priority: HighIssue: DMVPN Phase 2 Tunnel intermittently goes UP/DOWN, causing loss of reachability to HQ and apps like VoIP. Symptoms Observed Symptom Description Tunnel state flapping Tunnel interface […]
![Ticket#8 - VOIP Choppy Audio – DSCP Marking Mismatch Fixed [QoS Real World] [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-8.jpg)
Problem Summary Users across multiple floors reported choppy VoIP audio during internal calls. The problem was intermittent but noticeable during peak hours. Symptoms Observed Root Cause Analysis Upon initial inspection, end-to-end ping and traceroute were normal. However, show policy-map interface revealed DSCP marking inconsistencies between […]
![Mastering SPAN and RSPAN Configuration – A Deep Dive for Real-World Network Monitoring [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Mastering-SPAN-and-RSPAN-Configuration-–-A-Deep-Dive-for-Real-World-Network-Monitoring_networkjourney.png)
When it comes to network troubleshooting and traffic analysis, capturing the right packets at the right place makes all the difference. How SPAN and RSPAN work behind the scenes—this post is tailor-made for you. Today, we’ll simplify a topic that often looks intimidating in textbooks […]
![Cisco Debug vs Show Commands: Deep Dive for Network Troubleshooting [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Cisco-Debug-vs-Show-Commands-Deep-Dive-for-Network-Troubleshootingnetworkjourney.png)
If you’ve ever been stuck troubleshooting a stubborn routing issue or chasing down why BGP isn’t forming, you know that sometimes a simple show command gives you just the picture—but not the full story. That’s where debug steps in. In this guide, I’ll break down […]
![Ultimate Comparison: NetFlow vs sFlow – Insights [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/Ultimate-Comparison_NetFlow-vs-sFlow-–-Insights_networkjourney.png)
I know firsthand how critical choosing the right traffic monitoring tool is—be it for CCNA/CCNP preparation, network optimization, or troubleshooting. Today, we’ll decode two powerful technologies: NetFlow and sFlow. We’ll break down what they are, how they work, and which one suits your network—all in […]
![Mastering Syslog Levels and Configuration in Cisco Networks [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/Mastering-Syslog-Levels-and-Configuration-in-Cisco-Networks_networkjourney.png)
We’re diving into one of the most underutilized yet powerful tools in network troubleshooting—Syslog. Whether you’re a CCNA, CCNP aspirant, or a working professional in a NOC/SOC environment, having a deep understanding of Syslog Levels and Configuration will save you hours of guesswork and help […]
![Route Redistribution with Tagging – Mastering Controlled Routing Across Protocols [ CCNP ENTERPRISE ]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/Route-Redistribution-with-Tagging-–-Mastering-Controlled-Routing-Across-Protocols-CCNP-ENTERPRISE-.png)
Today we’re diving deep into a topic that often haunts network engineers during real-world implementations and certifications like CCNP or CCIE — Route Redistribution with Tagging. I still remember a consulting project where a simple redistribution misstep created routing loops and service disruption across multiple […]
In today’s rapidly evolving tech landscape, hands-on experience is invaluable. Building your own network lab is an excellent way to gain practical knowledge, experiment with different configurations, and prepare for certifications like CCIE, CCNP, and other advanced networking courses. This blog post will guide you […]
