Episode 103: Routing Scope — Interior vs. Exterior Routing
Not all routing protocols are created for the same environment. This episode explains the difference between Interior Gateway Protocols (IGPs) and Exterior Gateway Protocols (EGPs). IGPs like RIP, OSPF, and EIGRP are designed to operate within a single administrative domain or autonomous system, focusing on fast convergence and ease of configuration. In contrast, EGPs such as BGP handle routing between autonomous systems across the public internet and prioritize stability and policy control over speed.
We also discuss the administrative and policy implications of using EGPs, such as filtering, route aggregation, and peering agreements. You’ll learn how networks choose which type of protocol to use depending on their role and size, and how scope influences scalability and control. Understanding routing scope helps you design the right solution for enterprise and ISP-grade networks alike.
