EIGRP MD5 Authentication


Ben and Jerry are running their business from the north pole and have an icy request for you. They would like you to setup EIGRP (Enhanced Interior Gateway Routing Protocol) and make sure that all network updates are secure by enabling authentication…don’t get cold fingers on this one, time to warm up the routers!


  • All IP addresses have been preconfigured for you.
  • Both routers has a loopback0 interface:
    Ben: /24
    Jerry: /24
  • Configure the correct date and time for both routers. Just configure today’s date/time.
  • Configure EIGRP AS 12 on both routers, advertise all networks.
  • Ensure you have an adjancency and routing information is exchanged.
  • Enable MD5 authentication for EIGRP AS 12 with the following parameters:
    Key Chain: GNS3VAULT
    Key-ID 1: password chunky
    Key-ID 2: password monkey
  • Key1 should be valid from today until 15 minutes later from the moment you configure it.
  • Key2 should be valid from today and will never expire.
  • Ensure routing information is still exchanged between both routers.

It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the protocols for CCNA.

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I collected all my knowledge and created a single ebook for you that has everything you need to know to become a master of CCNA.

You will learn all the secrets about EIGRP, authentication, key-chains and more.

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EIGRP MD5 Authentication Network Topology

Video Solution:

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com


  1. Really practical !! I learnt loads got to grips with system clock and key chains BONUS. Should know this but feel so much better about it now.

  2. all your labs are gud, get 2 learn a lot
    thnks 4 the labs
    hope you come up with more labs

  3. Just lost 15 minutes in troubleshooting because I had configured a timezone offset (CET to UTC).

    This requires the "local" keyword to be configured along with the accept-lifetimes 🙂

    Good lesson though 🙂

  4. Really Amazing Rene ! Each Lab of yours is a great resource to learn and deep dive into anything

  5. Plz help…

    It might sound silly but… m unable to open the projects in GNS3, the file format is in Winrar which is not opening in GNS3, i have tried it after unzipping it as well…. can some 1 tel me how to load the labs on this website to GNS3


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