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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
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
Key Concept: Developed in the 1990s, the Enhanced Interior Gateway Routing Protocol (EIGRP) is an improved version of Ciscos 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.
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Version 3.0 - Version Date: September 20, 2005
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