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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)
                     9  Other Interior Routing Protocols

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Interior Gateway Routing Protocol (IGRP)
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TCP/IP Exterior Gateway/Routing Protocols (BGP and EGP)
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Enhanced Interior Gateway Routing Protocol (EIGRP)
(Page 2 of 2)

Other Features of EIGRP

In order to build the tables of information it needs to calculate routes, EIGRP requires that each router make and maintain contact with other routers on their local networks. To facilitate this, EIGRP incorporates a neighbor discovery/recovery process. This system involves the exchange of small Hello messages that let routers discover which other routers on the local network, and to periodically check their reachability. This is very similar to the use of the identically-named Hello messages in OSPF, and has a low impact on bandwidth use because the messages are small and infrequently sent.

Some of the features in IGRP carry through to its successor, such as the use of split horizon with poisoned reverse for improved stability. In addition to the basic improvements of efficiency and route convergence that accrue from the algorithm itself, EIGRP includes some other features. These include support for variable length subnet masks (VLSM) and support for multiple network-layer protocols. This means that EIGRP could be configured to function on a network running IP as well as another layer three protocol.

Key Concept: Developed in the 1990s, the Enhanced Interior Gateway Routing Protocol (EIGRP) is an improved version of Cisco’s IGRP. It is similar to IGRP in many respects, but uses a more sophisticated route calculation method called the Diffusing Update Algorithm (DUAL). EIGRP also includes several features that make it more intelligent in how it computes routes, borrowing concepts from link-state routing protocols, and using more efficient partial updates rather than sending out entire routing tables.


 


Previous Topic/Section
Interior Gateway Routing Protocol (IGRP)
Previous Page
Pages in Current Topic/Section
1
2
Next Page
TCP/IP Exterior Gateway/Routing Protocols (BGP and EGP)
Next Topic/Section

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