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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Autosummarization and Discontiguous Classful Networks

ImageThe Auto Summarization Option

Older routing protocols, namely RIP-1 and IGRP, were classified as classful routing protocols. This term comes from the fact that these classful routing protocols had to pay more attention to details about Class A, B, and C networks, in part because of the simplicity of the routing protocol.

These older classful routing protocols also had to use a more careful and cautious subnet design plan to avoid a problem called a discontiguous classful network. These simpler old routing protocols just got confused when a classful network became discontiguous, because of a ...

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