A routing protocol is a list of rules that help routers and other devices communicate to each other about how to send data over different networks. They decide which are the best routes for data to travel.
Routing protocols are split into two main groups: those that work inside a single network (Interior Gateway Protocols) and those that connect different networks (Exterior Gateway Protocol). This section focuses on the types of Exterior Gateway Protocol, which link separate systems for smooth data flow.
Main Types of Exterior Gateway Protocol (EGP)
There are a few key examples of the gateway routing protocol known as EGP. These protocols help routers in different networks talk to each other. Here’s a simple breakdown of the main types:
- Original EGP: This was the first exterior routing protocol created in the 1980s. It shared basic info about which networks could be reached. It worked well for simple setups like connecting to ARPANET but couldn’t handle complex paths or big networks.
- Border Gateway Protocol (BGP): BGP replaced the original EGP. It is the most used external gateway protocol today. It shares detailed routing info between networks, picks the best paths, and supports the modern internet’s huge size and complexity.
- EGP Variations: Early versions, like those in RFC 827 and 904, were tested but faded away. They focused on basic reachability and couldn’t grow with the internet.
Each type is used to link networks together. These days, BGP stands out because it is strong and flexible.
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