Archives

EVPN/VXLAN didn't appear because engineers wanted more acronyms. It appeared because the old network model broke under the demands of modern data centers.

I measured AI triage on 1500 closed GitHub issues across three real codebases. The cost case is real. But on one repo, automating would have silently mislabeled one issue in three — and the accuracy number gives you no warning.

We keep asking which jobs AI will replace. Maybe the better question is whether AI can lower the cost of changing direction — and make starting over survivable.

We used to walk without a destination. Now we walk 10,000 steps to close a ring. The walk is the same. But something is different.

We live in the present, but somehow feel somewhere else — in a past that's gone or a future that won't come. The aftertaste of a life that almost was never fully disappears.

You have a family, a mortgage, obligations. But what would it actually cost you to change direction? Maybe the problem isn't income — it's the structural risk of being wrong.

At the gym I saw teenage boys loud in the hot tub and a quiet man alone in the cold plunge. The strange thing about growing up is you can't see it from the inside — only in mirrors you didn't look for.

The AWS Well-Architected Framework is basically AWS handing you a checklist so you don't forget the important details. A walkthrough of all six pillars with practical exam tips.

Building applications tightly coupled to a single LLM provider creates technical debt. Here's an interface-based architecture pattern that lets you switch providers without rewriting your codebase.

Automation, AI Workflows, and AI Agents are often used interchangeably — but they represent fundamentally different levels of autonomy. A clear breakdown to help you choose the right approach.

How to install Jenkins using Docker — pulling the image, running the container, and completing initial setup.

Using Go to connect to Cisco devices over SSH — reading show commands programmatically and parsing network device output.

Using Postman Environment Variables to manage tokens and base URLs across collections — making API testing much easier.

Basic Python script structure notes — a reference for organizing scripts with imports, functions, and a main entry point.

How to connect VXLAN fabrics to the outside world — external routing, VRF leaking, and border leaf design.

The problem with VXLAN and vPC — and how anycast VTEP solves it by presenting a single logical VTEP address.

EVPN IRB symmetric routing: how it solves the ARP/CAM scaling problems of asymmetric routing using L3 VNIs.

EVPN IRB asymmetric routing: how it works, its limitations with ARP cache and CAM table scaling, and when to avoid it.

BGP EVPN as a control plane for VXLAN: route types, MP-BGP, and how it replaces flood-and-learn.

Configuring VXLAN with multicast flood-and-learn control plane on Cisco NX-OS. Step-by-step with commands.

VXLAN is a tunneling protocol that encapsulates Layer 2 Ethernet frames in Layer 3 UDP packets. An overview of how it works and why it exists.

FabricPath is Cisco's L2 routing technology — MAC-in-MAC routing that removes STP from the topology. How it works and when to use it.

How vPC handles failures: orphan ports, peer link loss, keepalive loss, and dual-active scenarios.

FHRP acts as active/active forwarding over vPC. How HSRP and VRRP integrate with vPC on Nexus switches.

The vPC Peer Link should never be blocking. Notes on moving from standard vPC to back-to-back vPC topologies.

Step-by-step vPC configuration on Cisco NX-OS: peer keepalive, peer link, vPC domain, and member ports.

Multi-Chassis EtherChannel types and vPC fundamentals. The building blocks of vPC on Cisco Nexus switches.

Nexus 2000 Fabric Extenders act as remote line cards. Notes on FEX architecture, connectivity modes, and design considerations.

Nexus Virtual Device Contexts let you virtualize physical hardware — similar to contexts in ASA. How VDCs work on Cisco Nexus.

Practical NX-OS CLI notes: aliases, show commands, and tips for working efficiently on Cisco Nexus switches.

A Python script that sends email notifications from a Gmail account — useful for scripts that need to report status or data.

Cisco SD-WAN zero-touch provisioning (ZTP): how Viptela's automatic provisioning SaaS brings up new sites without on-site engineers.

Key components of Cisco SD-WAN: vManage, vSmart, vBond, and vEdge. An overview of the architecture and control plane.