Interdomain Routing: Border Gateway Protocol

Introduction

Just the way packets need to move around within a domain or autonomous system, packets need to move across them too. To enable all domains to communicate with each other, they need to be talking in the same language, in other words, they need to be using the same protocol. Hence, there exists just one interdomain routing protocol and it’s called the Border Gateway Protocol (BGP). We’ll spend a bit of time on this one as it is essentially the glue that holds the Internet together!