Build Your First Network Automation Lab: Python + NETCONF on Cisco CML (With Working Code)

Network automation starts with a lab, three routers, and a Python script that actually talks to them. No slides, no theory hand-waving — just working code against real (virtual) devices. This guide walks you through building a NETCONF/RESTCONF automation lab on Cisco CML in under 60 minutes. You'll pull configs, push changes, and deploy across multiple devices programmatically. Everything here runs against IOS-XE with standard YANG models. Why You Need a Hands-On Lab Reading API docs doesn't build muscle memory. Network automation requires you to: Navigate YANG model namespaces and build XML filters from scratch Debug SSH/NETCONF connection issues in real time Handle multi-device deployments with threading Understand the difference between running and candidate datastores The only way to get there is repetition against real devices. What You Need Component Minimum Recommended Cisco CML 2.5+ (Personal $199/yr) 2.7+ with API Host Machine 16 GB RAM, 4 cores 32 GB, 8 cores Python 3.9+ 3.11