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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  TCP/IP Routing Protocols (Gateway Protocols)
                9  TCP/IP Interior Routing Protocols (RIP, OSPF, GGP, HELLO, IGRP, EIGRP)

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OSPF Message Formats
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TCP/IP Gateway-to-Gateway Protocol (GGP)
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Other Interior Routing Protocols

The Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) are the two most well-known interior routing protocols used in the TCP/IP suite, and for this reason I have described each in considerable detail. In addition to these, there are several other TCP/IP interior routing protocols that fall into one of two categories. Some are either protocols that are no longer used today but are interesting from a historical perspective, and others are proprietary alternates to RIP and OSPF that you may encounter today in the networking world but perhaps not as often.

In this section, I provide a brief description of four additional TCP/IP interior routing protocols. I begin with a look at two obsolete protocols that played an important role in the early Internet: the Gateway-to-Gateway Protocol (GGP) and the HELLO Protocol. I then describe two interior routing protocols developed by Cisco Systems, which are sometimes seen in the industry today as alternatives to RIP and OSPF: the Interior Gateway Routing Protocol (IGRP) and the Enhanced Interior Gateway Routing Protocol (EIGRP).

Background Information: In some cases in this section, I make comparisons to RIP and OSPF as appropriate, to show where these protocols are similar to or differ from the “big two”. You may wish to have some familiarity with RIP and OSPF before continuing here.


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