CTT-TAC: Enhanced Gateway Routing Protocol (EIGRP)


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Detailed Information

In this module, you will learn the basic concepts behind EIGRP. You will also do hands-on Configuration Labs to learn some fundamental concepts of EIGRP, and a Challenge Lab to test your troubleshooting knowledge.


At the end of this tutorial, you will be able to:

  • Describe the Reliable Transport Protocol and its function in EIGRP.
  • Summarize the neighbor discovery and recovery processes.
  • Discuss the process of EIGRP metric calculation and list the variables used.
  • Describe how EIGRP determines which paths are loop free.
  • Describe the process used to clear bad routes from EIGRP routing tables.
  • Describe the query process used to find paths to lost destinations.
  • Describe address summarization.
  • Summarize the administrative distance used by EIGRP to select routes.
  • Describe redistribution.
  • Discuss load balancing, over both equal- and unequal-cost paths.
  • Describe the three approaches to configuring default routing.


  • Configuration Lab: Configuration, Updates and Acknowledgements, and Debugging
  • Configuration Lab: Load Balancing with Variance
  • Configuration Lab: Redistribution
  • Configuration Lab: Redistribution with an Autonomous System
  • Challenge Lab: EIGRP