Let's talk About Networks, by Jerome Tissieres
If you have more than three Cisco Nexus switches in nx-os mode, and you are not using Cisco DCNM or any other similar tool, you probably already have encountered this question: How to automate file uploads to your Cisco Nexus switches?
Here is a turnkey Python script using Netmiko’s SCP function to do this.
Here is the third post of the series on network troubleshooting and tools under RHEL / CentOS.
In this post, I will talk about the netstat and ss commands.
Here is a copy of the information email I just received:
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.
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.
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.
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.
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.
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.
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.
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.
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.
