String manipulation is a skill that is useful almost on daily basis for most IT professionals. Search, replace, count, filter, order text files from the command line make the process repeatable and fast, without too much clickety-click. Awk, sed, sort, cut, uniq are powerful tools to master. Today my focus is on sed that helped me during the migration to the new theme of my website sed (stream editor) is a non-interactive command-line text editor.
Sometimes small problems are opportunities to learn something new or apply skills seldom used. I often try to do things differently or new paths, sometimes just to avoid boredom, but also to improve myself. This is one of the pillars of essentialism and Kaizen that I try to apply to my work and life. The challenge For reasons I need to check very quick the public IP addresses of some Meraki MXs connected to LTE routers or dynamic IP addresses.
On May 10th I had a chance to attend again ITNOG in Bologna. Even if ITNOG seems to be an event with focus on ISP I find it very educative for anyone working in the enterprise market. The boundaries between enterprise and ISP network are a common ground for negotiation about connections, routing, security, SLA. Sun Tzu advice it is a good strategy to know your enemy, I see no enemies on the other side of the CPE but the idea remains valid.
Network documentation and monitoring are topics that never lose interest to me. Over the years I worked with many products, Nedi, Observium, Librenms,, NetBox, Icinga, NetShot, Smokeping to name a few. Each product has its strengths and weaknesses that in some cases are nothing more than the aspects on which the manufacturer has decided to concentrate development more. NetShot has compliance tests easy to write and verify, Smokeping is easy to setup and focused on monitor network and services latency.
Another Cisco Live went with all its usual new product announcements and marketing drives for the next big thing. This year I have been more busy than usual with meetings with customers and I have not participated in all the technical sessions of previous years. In the end this actually allowed me to pay more attention to the real needs of customers rather than just technology. One of the elements that emerged most frequently was the need for more attention to the quality of the code.
Keeping up with the new releases of the various manufacturers is an important part of the job of every network engineer. Usually it is enough to see the videos available online but from time to time it is necessary to take one more step. Cisco has released the new Catalyst 9000 family that integrates with 1/20/2019 12:11:45 PM and ISE to build an SDA network. The Catalyst 9k family, strong of IOS XE, also allows programmability levels not previously possible.
I really enjoy discussing network design and deploy details with colleagues, customers and fellow network engineer. I find these discussions challenging, stimulating. An open, sincere and collaborative discussion gives a chance to better understand the real needs, fears, doubts of other professionals and to validate knowledge, expose gaps and most of all I learn a lot. This is still valid when discussing Data Center design or simpler topics like how to cable switch stacks.
I’m pleased to announce that my blog has been selected as a finalist in the Most Entertaining category of the IT Blog Awards, hosted by Cisco This blog is a project that I have been carrying out for years in the (little) free time between a demanding job, the study and the family. I think it is important to dedicate time to the blog because it has allowed me to meet many awesome people, actively participate in the community and make my contribution to the ecosystem that has helped me at the beginning of my career.
I’ve been working on a data center migration from regular switches to a Cisco ACI fabric in the last couple of months. I can’t say that’s enough to be defined as an ACI expert but I’ll share here what I learned from the experience. The project started with a Network Centric approach for an one-to-one migration from the previous network. After the migration new VRFs are being created in App Centric mode with contracts.
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