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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Chapter 6. Interior Gateway Routing Protocol (IGRP)

  • Operation of IGRP

    IGRP Timers and Stability Features

    IGRP Metrics

    IGRP Packet Format

  • Configuring IGRP

    Case Study: A Basic IGRP Configuration

    Case Study: Unequal-Cost Load Balancing

    Case Study: Setting Maximum Paths

    Case Study: Multiple IGRP Processes

  • Troubleshooting IGRP

    • Case Study: Unequal-Cost Load Balancing, Again

    • Case Study: A Segmented Network

Cisco developed IGRP in the mid-1980s as an answer to the limitations of RIP, the most important of which are the hop count metric and the 15-hop internetwork size. IGRP calculates a composite metric from a variety of route variables and provides “knobs” for weighting the variables to reflect the specific characteristics and needs of the internetwork. ...

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