Why does BGP require an IGP to function?

One of the prerequisites to deploying BGP is the fact that you need to have fully functioning routing within an Autonomous System before you can deploy BGP. In other words, in order for internal BGP (iBGP) to operate, you must deploy an Interior Gateway Protocol (IGP) such as EIGRP or OSPF to ensure routing is established. This however can be counterintuitive. Since we're deploying BGP, which is itself a routing protocol, why do we need another routing protocol to make it work? In this video, I'll explain the reasoning behind this seemingly illogical logic. 🟥 SUBSCRIBE: https://shorturl.at/TTJxx Chapters: ============================================== 00:00 Introduction 00:53 Routing Must Be Established within an AS 02:44 Understanding the Role of BGP 04:39 Hierarchical Approach 05:18 Summary 🟩 Related Videos and Links: ============================================ What is BGP? -    • What is BGP?   eBGP vs. iBGP -    • eBGP vs iBGP - What's the difference?   🟦 About Welcome to telecomTech, where telecom and networking technologies... are simply explained! I’m Lazarus, a telecom professional with over 25 years of experience in network design, architecture, and telecom technologies. Over my career, I’ve led major projects, trained professionals, and helped countless individuals earn certifications and advance their careers. My goal is to make networking and telecom concepts clear, practical, and engaging—the way I wish they were taught when I started learning! Whether you’re a student, a professional growing your skills, or preparing for certifications like Cisco, telecomTech is here to guide you. Every video is crafted to help you solve real-world challenges with confidence and curiosity. Join me as we explore telecom and networking as a lifelong passion, not just a job. Let’s make this journey of growth and discovery together! #bgp #igp #routing #protocol #routingprotocoll #deployingBGP #telecomtech