PDF document. By Ravi Malhotra. How the IP routing process works, what are routers and how they work, direct and indirect routing, static and dynamic routing, the routing table. The protocols: IGP ( Interior gateway protocol ): RIP ( Routing Information Protocol ), IGRP ( Interior Gateway Routing Protocol ), EIGRP ( Enhanced Interior Gateway Routing Protocol ) and OSPF ( Open Shortest Path First ); the protocols EGP ( Exterior gateway protocol ): BGP ( Border Gateway Protocol ).