Update March 16, 2020: The in-person event is “relaunched” as an online event. Here is a copy of the information email I just received:
Read More...Cisco Live US 2020: To CLUS or not to CLUS? [updated]
Cisco Certifications changes: a short summary
Unless you’ve been living in a cave during the last nine months, specifically since Cisco Live US 2019, you should know that last Monday, February 24th, was the D-day for big changes in Cisco certifications. Here is a short summary of the major changes and what to remember about them.
Read More...Cisco NX-OS Graceful Insertion and Removal (GIR)
If you operate a data-center network with Cisco Nexus, you’ve probably already faced the problem of how to perform a maintenance on one of the two switches of a vPC pair, with minimum impact and risks for the production network. Cisco NX-OS contains a feature called “Graceful Insertion and Removal” or GIR to help you for that. Here is how it works.
Read More...Last year review and resolutions for 2020
As the end of the year approaches, it is time to make a review of the past year and see what I would like to do, what I must do, and what I can improve in 2020. In brief, here’s my last year review and resolutions for 2020.
Read More...Basic Linux Networking tips and tricks part-2: the mtr command
Here is the second post of the series on basic network troubleshooting and tools under RHEL / CentOS. In this post, I will talk about the Linux mtr command.
Read More...2019 IT Blog Awards finalist!
I have the honor of having my blog selected as a finalist in the Most Educational category of the 2019 IT Blog Awards, hosted by Cisco.
Read More...Basic Linux Networking tips and tricks part-1: ip and nmcli commands
We have all heard, at one time or another, a system administrator blaming the network. Then, it is up to the network engineers to prove that the network is not in cause. To do this, a minimum of network troubleshooting skills on Linux systems could be required. For the first post in the series: many examples of how to use the ip and nmcli commands.
Read More...Cisco Nexus NX-OS tips and tricks
As you can see here, I have been using Cisco Nexus NX-OS for many years. And even more intensively since a few months, as I work for a data center now. During all this time, I accumulated a nice collection of NX-OS tips and tricks. Here it is. I hope this can help you to improve your daily work.
Read More...New bookshelf page
I just created a new bookshelf page to list all the IT / networking / programming books that I have read or I am currently reading.
Read More...Shutdown thousands access ports with Python and Netmiko
When people ask me “what a network engineer should do to start in network automation?”, my first answer is: start with small things. Try to automate basic and repetitive tasks you do every day. Go after the low-hanging fruits first. Then, step by step, you can do more and more complex things. This is how I learn the best. In the same vein, I want to share with you my recent experience of automating a very basic and repetitive task: shutdown thousands of unused network access ports.
Read More...100Gb Ethernet transceivers, modules and form factors on Cisco products
At the time of the 400Gb Ethernet interfaces introduction, here is a summary of the different form-factors, transceivers and modules available for 100Gb Ethernet on Cisco devices. As you will see below, there are many different types of 100Gb Ethernet transceivers. And each type have its own functional mode. In a next article, I will try to explain the differences between them and will give more details about the most common: the QSFP-28.
Read More...Multicast lab 5: Source-Specific Multicast (SSM)
After giving a two-days training to a customer on multicast technology, I take the opportunity to have my lab and the configurations ready to share with you a suite of five different multicast configurations examples. And, how to make some tests and troubleshooting. These examples are based on the labs I used to practice the CCIE R&S practical exam.
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