An EIGRP Overview
EIGRP has many features:
Variable-Length Subnet Mask (VLSM) support— EIGRP is a classless protocol and carries subnet information in its updates.
Incremental updates— EIGRP sends only information that has changed. It doesn't require full routing updates, unlike other routing protocols such as Routing Information Protocol (RIP).
Rapid convergence— By using Diffusing Update Algorithm (DUAL) and the concept of a feasible successor, EIGRP can preselect the next best path to a destination.
MD5 route authentication— Since Cisco IOS software Release 11.3, EIGRP supports MD5 password authentication on routing updates.
Automatic route summarization— Route summarization is done automatically on major bit boundaries.
Multiple protocol ...
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