OnVue – Get certified from your home
One of the positive aspects of this difficult period, if I may say so, is the possibility of taking a Pearson Vue test online, called OnVue. Last Friday, October 23rd, I took a Cisco exam from home and I think it’s interesting to share with you the details of this experience. With OnVue – Get certified from your home! The registration for the exam The registration for the test is almost the same as for a Cisco test done in a Vue test center. Go to the website of Pearson…
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RDMA over Converged Ethernet (RoCE) on Cisco Nexus 9300
On a previous post, I made an introduction about NVMe, NVMe-oF and RDMA for network engineers. In this post, I’m going to talk about RDMA over Converged Ethernet (RoCE) and more specifically how to implement and configure the QoS part of RoCEv2 on the Cisco Nexus 9300 series. What is RoCE? RDMA over Converged Ethernet (RoCE – pronounced “Rocky”) is a network protocol that allows Remote Direct Memory Access (RDMA) over an Ethernet network. It does this by an encapsulation of an InfiniBand transport packet over Ethernet. There are two…
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NVMe, NVMe over Fabrics and RDMA for network engineers
In the past, the evolution of network-based storage was not really a problem for network engineers: the network was fast and the spinning hard drives were slow. Natural network upgrades to 10Gb, 40Gb, and 100Gb Ethernet were more than sufficient to meet the networking needs of storage systems. But now, with the introduction of ultra-fast solid-state disks (SSDs) and Non-Volatile Memory Express (NVMe), this is no longer true! Storage teams now have the ability to potentially saturate the network with incredibly fast devices. Network-based storage (SANs) using NVMe technology –…
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Basic Linux Networking tips and tricks part-4: curl command
Here is another post of the series on basic network troubleshooting and tools under Linux. In this post, I will talk about the cURL command. Others posts of the series This post is part of a series about basic Linux Networking tips and tricks. The others posts of this series are: The ip and nmcli commands The mtr command The ss and netstat commands The curl command What is cURL? cURL is a Linux command-line tool for getting or sending data and files, using an URL syntax. Since cURL…
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Automate file uploads to your Cisco Nexus switches
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. This script is very simple, it relies only on Netmiko functions and SCP. But it does its job very well and I share it here because it can certainly help you to save time. What…
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Basic Linux Networking tips and tricks part-3: ss and netstat commands
Here is the third post of the series on basic network troubleshooting and tools under RHEL / CentOS. In this post, I will talk about the netstat and ss commands. Others posts of the series This post is part of a series about basic Linux Networking tips and tricks. The others posts of this series are: The ip and nmcli commands The mtr command The ss and netstat commands The curl command netstat The netstat command is a network utility used to display network connections, protocol or interfaces…
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Cisco Live US 2020: To CLUS or not to CLUS? [updated]
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: The health and well-being of our customers, partners, employees and communities is of utmost importance to us. As a result, during this unprecedented time of the COVID-19 pandemic, Cisco Live, our premier in-person customer and partner experience of the year, is being relaunched as a complimentary, full-scale digital event, enabling remote participation from anywhere in the world. We’re dedicated to making sure that the experience at…
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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. Changes on current certifications Associate level The various CCNA certifications have been consolidated to only one now. And the CCDA also disappears. Remaining certs at associate level are: CCNA DevNet Associate (I will talk about DevNet certs more in details…
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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. Scenario Let’s take the example below: (click on the image to see a larger version) We have two Nexus (in nx-os mode) in vPC. Doing layer-2 aggregation and …
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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. 2019 Review New position This year was really intense for me; not only did I change company, but I also changed my main technology as a network engineer. I went from being a consultant in enterprise networking, doing routing, switching, wireless and…
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