Introduction
Network architects who wanted to build multiprotocol networks in the early 1990s were faced with a tough dilemma. Most of the protocols running in enterprise network, namely IPX from Novell and AppleTalk from Apple, had no scalable routing protocols that enabled the network architect to build reliable large networks. The situation was only slightly better in the IP world—the older and proven routing protocols such as Routing Information Protocol (RIP) or Interior Gateway Routing Protocol (IGRP) were reliable, but slow, and the newer emerging routing protocols, such as Open Shortest Path First (OSPF), were complex and unproven in the field.
Cisco Systems decided to bridge the gap between the existing technology and customer requirements ...
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