During the past three years, I have spent a good portion of my time testing, planning, designing, and then migrating our DC network from Cisco FabricPath and Classic Ethernet environments to VXLAN BGP/EVPN. And simultaneously, from a hierarchical classic two-tier architecture to a more modern Clos 400Gb-based topology. The migration is not yet 100% completed, but it is well underway. And I have gained significant experience on the subject, so I think it’s time to share my knowledge and experiments with our community.
Read More...SCP not working with MacOS 13 Ventura?
You have upgraded your MacOS to version 13 (Ventura) and a simple SCP to a network device does not work anymore? In fact, this is normal, here is the reason and how to solve this problem.
Read More...RobotFramework Debug Logs
This is a very short post, as a complement to my previous post about PyATS, Genie, and RobotFramework. How can we see the debug logs of RobotFramework?
Read More...Cisco Live 2022
Cisco Live US 2022 will be June 12-16 in Las Vegas. After two years of virtual conferences and being vaccinated three times against Covid-19, I’m more than motivated to go in person! However, for those who are still hesitating, there is also an online version, over two days, probably in a similar format to 2021.
Read More...Cisco DCAUTO exam study resources
I just passed the Cisco DevNet DCAUTO (300-635) exam (Yay!). This is my 3rd Cisco exam on network automation after NPDESI in 2018 (replaced now by the DevNet program), and DevNet CORE (DEVCOR) in 2020. But this time, I documented everything I read, so I could report it here and build a Cisco DCAUTO exam study resources. By doing this, I hope to help anyone who wants to study for this certification. And, as I have already passed the DevNet CORE exam, I am now Cisco certified DevNet Professional.
Read More...2021 IT Blog Awards finalist!
I have the honor of having my blog selected as a finalist in the 2021 IT Blog Awards, hosted by Cisco. It is a privilege and a great joy for me to have my blog selected for the fourth consecutive year! Congratulations also to all of the other finalists, who all produce great and valuable content! Click here to vote and choose the winner of the 2021 IT Blog Awards.
Read More...First steps with pyATS
Have you ever wanted to compare the operational state of a bunch of network devices between two specific times? Not only if the interfaces are up or down, but the number and status of BGP peers, the number of prefixes received, the number of entries into a MAC-address table, etc? This is something quite laborious to do with classical NMS or Do-It-Yourself scripts. And this is where pyATS can become a real asset. Here are my first steps with pyATS: Network Test & Automation Solution.
Read More...How to simulate a host in a real network?
Like some other posts, I didn’t think I would write this one because it seemed obvious. But, after talking to a lot of engineers and customers, I realized that not everyone knows this trick. So here it is. The question is this: how to simulate a real host in a physical network environment when you don’t have computer at your disposal? Well, let’s take an example.
Read More...Basic Linux Networking tips and tricks part-5: tcpdump
Here is another post of the series on basic network troubleshooting and tools under Linux. In this post, I will talk about tcpdump.
Read More...25 years as a Network Engineer!
In January 1996, I entered for the first time in the configuration of a Cisco 2501 router. This was the beginning of my career as a network engineer. That was just 25 years ago! Here’s a quick look back and a few tips for junior engineers who are at the beginning of their careers.
Read More...Goodbye 2020… and never come back!
As we approach the end of the year, we can finally say goodbye to 2020. Goodbye 2020… and never come back! But, it is also time to look back at 2020 and try to see what the year 2021 promises us.
Read More...2020 IT Blog Awards finalist!
I have the honor of having my blog selected as a finalist in the Most Educational category of the 2020 IT Blog Awards, hosted by Cisco.
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