Chapter 2. Understanding Routing Information Protocol (RIP)

This chapter covers the following key topics about Routing Information Protocol (RIP):

• Metric

• Timers

• Split horizon

• Split horizon with poison reverse

• RIP-1 packet format

• RIP behavior

• Why RIP doesn’t support discontiguous networks

• Why RIP doesn’t support variable-length subnet masking (VLSM)

• Default routes and RIP

• Protocol extension to RIP

• Compatibility issues

RIP is a distance vector protocol that uses hop count as its metric. This protocol is very simple and was intended for small networks. RIP is similar to gated, which was distributed by the FreeBSD version of UNIX. Before the RFC for RIP Version 1 (RIP-1) was written, several versions of RIP were floating around. ...

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