One of the bosses I really look up to once gave me advice that stuck with me. He simply said: “There’s no replay.” At first, it sounds simple. But the more I think about it, the more meaning it has. Sometimes, we get so focused on work and our careers that we forget something more […]
There’s No Replay: Don’t Miss the Moments That Matter Read More »
I recently attended a Fortinet event focused on Operational Technology (OT) and IoT security. Coming from a network architecture background, one thing that stood out to me was how different the priorities of OT environments can be compared to traditional IT networks. In IT, we are used to thinking about patching, authentication, encryption, segmentation, endpoint
OT Security – What I Learned About OT Security Read More »
One of the most vital control-plane concepts to master is how OSPF’s Shortest Path First (SPF) algorithm evaluates candidate links during Dijkstra’s tree calculation. It’s easy to assume that OSPF will naturally “prefer” a real multi-access segment over a loopback interface, or that it will detect conflicting subnet advertisements and throw an error. However, SPF
003 CCIE EI Study Notes – Why OSPF Chose the Wrong Route? Read More »
The 40-Second Rule That Can Surprise Every OSPF Student Part of my CCIE Enterprise Infrastructure Journey One of the first things we learn about OSPF Designated Router (DR) and Backup Designated Router (BDR) election is simple: the router with the highest OSPF priority wins. If there’s a tie, the router with the highest Router ID
002 CCIE EI Study Notes – Why the First 40 Seconds Decide your OSPF DR/BDR Read More »
OSPF Explained Like You’re Traveling Across the Philippines “Part of my CCIE Enterprise Infrastructure Journey.” I remember concepts much better when I can visualize them. So instead of memorizing Link State Advertisements, DR elections, and SPF calculations, I imagined traveling across the Philippines. Oddly enough… It made OSPF much easier to understand. Let’s start from
001 CCIE EI Study Notes – OSPF Explained Read More »
The Hook: Busting the Myth Let’s start with a reality check that 90% of networking articles get wrong: Distance Vector protocols aren’t the ones eating your CPU. If you are running RIP or EIGRP, your router is essentially “routing by rumor.” It takes a neighbor’s word for it, drops it in a table, and moves
The Day 1,000 OSPF Neighbors Killed ASR Router Read More »
You Can Be Right and Still Lose. You Can Lose and Still Win….. When I was younger in my IT career, I believed that if I had the right answer, I had to prove it. If someone pointed to the network, I’d defend it. If I knew the issue wasn’t on our side, I’d push
You Can Be Right and Still Lose Read More »
Introduction For many months—or maybe even a year now—I’ve been wondering if I’d ever get the chance to add Cisco DNA Center (now Cisco Catalyst Center) to my home lab. At first, it felt like a huge “how?” The biggest challenge wasn’t just figuring out the installation process, but also meeting the hardware requirements… and
Installing Catalyst Center (DNAC) 2.3.5 on Proxmox (Budget Friendly?) Read More »
In real-world scenarios, there are deployments where we need to consider vendor interoperability—especially when it comes to SFP modules. Whether it’s due to requirements, cost optimization, restoration, or troubleshooting, this becomes a key factor in network operations. One common issue arises when using non-native or unsupported SFP modules, and this is where FortiGate commands come
Unsupported SFPs in FortiGate Read More »
Today, let’s talk about wireless design and the key components used in enterprise networks. This is a summary of what I’ve learned from my research and, of course, a little bit of “YouTube University” 😄 Multi-Gigabit Ethernet and Future-Proofing Network Switches The use of multi-gigabit ports supporting 1, 2.5, 5, and 10 Gbps on switches
Wi-Fi End-to-End Design & Components Read More »
