CCIE R&S Written Overview: RIP

RIP Overview

• Standards Based Distance Vector IGP

– Uses split-horizon, poison reverse, count to infinity

– UDP port 520 for transport

• Two versions

– RIPv1

• Classful

• Updates as broadcast

– RIPv2

• Classless

• Updates as multicast to 224.0.0.9

Enabling RIP

• Enable the global process

– router rip

• Enable the interface process

– network [address]

– Matches major network only

RIP Features

• RIP Versions

– Supports both v1 and v2 concurrently

• Summarization

– RIPv2 is classless but does automatic classful summarization by default

– Manual summaries can be configured per interface

• Split-Horizon

– Updates received in an interface will not be sent back out the same interface

• Update Types

– Configurable as broadcast, multicast, or unicast

• Metric Calculation

– 1 hop per device

– Maximum of 16 hops

– Metric can be changed with offset list

• Convergence Timers

– Four timers of update, invalid, holddown, and flush

• Authentication

– Clear text and MD5 update authentication

• Filtering Updates

– Passive Interfaces

– Distribute Lists

– Offset Lists

– Administrative Distance

RIP Command Reference

• Very little functionality in RIP compared to other IGPs

Ciscos website/documentation contains all commands used in the RIP process.