ITE PC v4.0Chapter 15© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicThe Evolution of Dynamic Routing Protocols One of the earliest routing protocols was Routing Information Protocol (RIP). –RIP has evolved into a newer version RIPv2. However, –The newer version of RIP still does not scale to larger network implementations. To address the needs of larger networks, two advanced routing protocols were developed: Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS). Cisco developed Interior Gateway Routing Protocol (IGRP) and Enhanced IGRP (EIGRP), which also scales well in larger network implementations.Additionally, there was the need to interconnect different internetworks and provide routing among them. Border Gateway Routing (BGP) protocol is now used between ISPs as well as between ISPs and their larger private clients to exchange routing information.With the advent of numerous consumer devices using IP, the IPv4 addressing space is nearly exhausted. Thus IPv6 has emerged. To support the communication based on IPv6, newer versions of the IP routing protocols have been developed (see the IPv6 row in the table).