What is igp?

An IGP, or Interior Gateway Protocol, is a type of routing protocol used within autonomous systems to exchange routing information between routers. IGPs are commonly used to route traffic within a single autonomous system, as opposed to Exterior Gateway Protocols (EGPs) which are used to route traffic between autonomous systems.

There are several different types of IGPs, with some of the most common ones including RIP (Routing Information Protocol), OSPF (Open Shortest Path First), and EIGRP (Enhanced Interior Gateway Routing Protocol). Each of these protocols has its own characteristics and strengths, and the choice of which IGP to use will depend on factors such as network size, complexity, and routing requirements.

IGPs work by allowing routers within the same autonomous system to share information about network topology, reachability, and best paths to destination networks. This information is used to build routing tables and make forwarding decisions on how to best route traffic within the network.

Overall, IGPs play a crucial role in ensuring efficient and reliable routing within autonomous systems, helping to optimize network performance and connectivity.