Networking Perspectives by Jerome Tissieres

Linux Networking tips and tricks: 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.

Jerome Tissieres November 22, 2019

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.

Jerome Tissieres November 21, 2019

Linux Networking with 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: Linux Networking with ip and nmcli commands

Jerome Tissieres October 18, 2019

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.

Jerome Tissieres September 20, 2019

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.

Jerome Tissieres May 23, 2019

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.

And, as you will see below, there are many different types of 100Gb Ethernet transceivers. Because each type has its own functional mode.

Jerome Tissieres March 9, 2019

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 configuration 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. This lab is about Source-Specific Multicast (SSM).