OSPF Demand Circuit


Living on a tropical island isn’t all that bad. You run a small network used to order cocktails at the Coconut Bar so they are delivered at Palm beach. Unfortunately the links you are using are leased line and pretty expensive. You need to make sure you don’t send any unnecessary OSPF traffic or you won’t be able to afford any more sunscreen.


  • All IP addresses have been preconfigured for you.
  • Configure OSPF on both routers. Achieve full connectivity.
  • Ensure no periodic hello packets are sent on the serial interfaces without breaking the OSPF neighbor adjacency.

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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You will learn all the secrets about OSPF, neighbor adjacencies, network types and more.

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OSPF Demand Circuit Network Topology

Video Solution:

Configuration Files

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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. Hi

    After enabling demand-circuit, not even a OSPF packet is being exchanged btwn the two routers, then how they maintain their adjacency ?

  2. Hi,
    startup config and final configs are same, please kindly correct them

    thank you

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