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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