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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