Hello! My name is Jerome Tissieres, welcome to my blog.


Jerome Tissieres

About me

Network engineer since 1996, I have a long experience in network planning, design, operations and troubleshooting.

In 1996, I built from scratch the IP network one of the first private Internet services provider of Switzerland. Then, I worked 12 years expanding and operating IP networks for different national Internet services providers. I learned a lot on the job and became a specialist in SP access technologies (dial-up, DSL/DSLAM, CaTV, FTTH). In long haul transport networks (SDH and DWDM). In WAN like Frame-Relay, ATM, Metro-Ethernet rings, MPLS/VPN services, then VPLS and H-VPLS networks. In SP edge (BGP) and internal routing (IS-IS, OSPF, EIGRP). In VoIP and TV over IP services. And in many others technologies specific to Internet services providers, for residential and business customers.
During that time, I was also peering manager: in charge of edge network routing, capacity planning, upstream and content providers selections and negotiations. And all the tasks related to IP prefixes and AS numbers assignment, including a strong collaboration with RIPE NCC.

After that, I spent 10 years as enterprise network engineer. First, for the IMD business school in Lausanne, where I was in charge of the entire campus network (wired and wireless access, campus core and edge routing), the security (firewalls, VPNs, IDS/IPS) and the two data-center (data-center and storage networking, load-balancing, domain-names provisioning, SSL/TLS certificates management, I also did a bit of SEO…). Then, I worked for an international company with 30 sites worldwide and a multinational MPLS network. And finally, 4 years as consulting engineer for Swisscom enterprise, the largest network integrator of the country and a long-time Cisco gold partner. During these 10 years, I specialized in enterprise network routing and switching, corporate wireless access, enterprise security and mid-size data-center networks.

Now, since early 2019, I am working as network and security engineer for the CSCS in Lugano, Switzerland. The CSCS is part of the ETH Zurich, a university for science and technology, founded in 1855. The CSCS develops and operates cutting-edge HPC (high-performance computing) systems as an essential service facility for Swiss and European researchers. My daily job is to operate and make evolve the in-house high-speed data-center network.

You can find my complete professional experience on my LinkedIn page.

During my career, I also kept an important place for learning and self-study. I love learning, study and practice new technologies. I also like to share this knowledge with other people. Working as a network engineer for over 20 years, I have constantly learned: on network technologies, of course, but also on network design, best practices, troubleshooting methods, configurations and fault management, monitoring, scripting, network automation. And I am still learning almost every day. This is why I have a passion for this job.


Industry Certifications

I currently hold the following IT certifications:


  • Cisco Network Programmability Design and Implementation Specialist
  • CCNP R&S
  • CCDP
  • CCNA R&S
  • CCDA
  • CCIP (Cisco Certified Internetwork Professional, retired certification in 2014, replaced by CCNP-SP)


  • CMNA
  • CMNO #00177


  • HCSA IP Network


  • IPv6 Forum Gold Certified Network Engineer
  • Certified SonicWALL Security Administrator (CSSA)
  • IT infrastructure manager
  • Novell Supervisor certified – Novell NetWare 3.11 (Yes, this was during dinosaur times…)


And not CCIE?

This is true, I am not CCIE. I passed three times the CCIE R&S written exam (versions 4.0 and 5.0) and I failed four times at the CCIE Routing and Switching lab exam in Brussels. Once at the exam version 4.0 in 2013, and three times at the version 5.0 between 2016 and 2017. After that, I have stopped chasing my CCIE numbers to be able to learn other technologies.

During this great journey, I took two Narbik Kocharians / Micronics’s bootcamps and completed multiple times the practice lab workbooks of INE, iPexpert and Narbik. I also did many practice labs from Cisco expert-level training (formerly Cisco-360). This was a fantastic experience during around five years and I learned a lot!


Personal Side

On the personal side, I am married to a wonderful wife and have three beautiful children. My mother tongue is French and since 2010, we live in a nice place called “The Magic Valley” or Vallemaggia, in the Italian part of Switzerland. As you can see, English is not my mother tongue, this may explain some spelling mistakes on this blog, my apologies in advance.


About this blog

“It would be nice to write this in a blog, to help the next person facing the same problem!”

This is what I said, every time I meet a new challenge or problem and cannot find the corresponding documentation. Or when I found undocumented behavior on a network device or protocol. As network engineer since 1996, I said this phrase millions of times. So here it is now: I created this blog.

I talk here about Cisco, Meraki, Huawei, Mellanox, Cumulus-Linux and others network systems. The related software for network planning, design, operations, troubleshooting and automation. And also about my learning experiences in networking, software scripting and cloud.

Blog Awards


This blog has been selected as finalist in the Most Educational category – Shares great tips, tricks, or how-to’s to help you learn something new or further your understanding on a topic – of the 2019 IT Blog Awards, hosted by Cisco:ITBlogAwards_2019_Badge-Finalist-MostEducational_small



This blog has been selected as finalist in the Best Cert Study Journey category – provides useful insights into the need-to-knows throughout a certification study journeyof the 2018 IT Blog Awards, hosted by Cisco:


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