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TCP/IP Interior Routing Protocols (RIP, OSPF, GGP, HELLO, IGRP, EIGRP)
Modern TCP/IP routing architecture
groups routers into autonomous systems (ASes) that are independently
controlled by different organizations and companies. The routing protocols
used to facilitate the exchange of routing information between routers
within an AS are called interior routing protocols (or historically,
interior gateway protocols). Since most network administrators
are responsible for routers within a particular organization, these
are the routing protocols you are most likely to deal with unless you
become a major Internet big-shot. J
One of the benefits of autonomous
systems architecture is that the details of what happens within an AS
are hidden from the rest of the internetwork. This means that there
is no need for universal agreement on a single language
for an internet as is the case for exterior routing protocols. As a
network administrator for an AS, you are free to choose whatever interior
routing protocol best suits your networks. The result of this is that
there is no agreement on the use of a single TCP/IP interior routing
protocol. There are several common ones in use today, though as is usually
the case, some are more popular than others.
In this section I provide a description
of six different protocols used for routing within autonomous systems
in TCP/IP. The first two sections provide comprehensive descriptions
of two of the most popular TCP/IP interior routing protocols: the Routing
Information Protocol (RIP) and Open Shortest Path First (OSPF). The
third section provides a more brief discussion of two historical interior
routing protocols and two proprietary ones developed by networking leader
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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