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IP Routing Fundamentals by Mark A. Sportack

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EIGRP Background

The Internet is a highly dynamic network. Consequently, its protocol, IP, must be equally dynamic. The IETF, it seems, never ceases upgrading, modifying, and extending the IP specification. One of the unfortunate consequences of this sort of activity is that many other IP-centric technologies are forced to either keep the same pace of innovation or fall into obsolescence. Frequently, such technologies opt for some point in between these two extremes. IGRP, despite its success in the market, began to demonstrate some of the effects of obsolescence relative to the ever-evolving IP.

IGRP is still a highly useful routing protocol, but it just can't support some of the more complex changes made to IPv4. IGRP is, for example, inherently ...

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