IGRP and EIGRP Comparison

Building Scalable Cisco Internetworks Volume 3 (Cisco Training and Certification, Student Guide Version 2.0)

Interior Gateway Routing Protocol

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·         Cisco proprietary Protocol

·         Classful

·         Doesn’t support VLSM

·         Equal cost balancing by default

          - Use Variance command for unequal cost balancing

·         Broadcast updates to 255.255.255.255 every 90 secs

·         Uses Bellman-Dord Algorithm

·         It's only support for Cisco devices.

Enhanced Interior Gateway Routing Protocol

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·         Cisco proprietary Protocol 

·         Classless

·         Supports VLSM 

·         Equal cost balancing by default

          - Use Variance command for unequal cost balancing

·         Uses DUAL Algorithm

·         Multicasts its updates to 224.0.0.10

·         Sends updates upon adjacency and when the network topology changes

·         It's only support for Cisco devices.