CTT-TAC: Open Shortest Path First


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Detailed Information

In this module, you will learn the basic concepts behind OSPF. You will also do hands-on Configuration Labs to reinforce your understanding of OSPF, and two Challenge Labs to test your troubleshooting knowledge.


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

  • Describe the differences between link-state and distance-vector routing protocols
  • Visualize how OSPF operates
  • Understand the hello protocol and its role in forming neighbors and adjacencies
  • Display an OSPF link-state database and interpret its contents
  • Understand various OSPF extensions, such as stub areas, totally stubby areas, not-so stubby areas, and on-demand circuits
  • Configure OSPF
  • Redistribute external routes into OSPF, and configure an ASBR to advertise a default route into an OSPF domain
  • Monitor OSPF processes with show commands
  • Use debugging commands to monitor and debug OSPF processes
  • Configure OSPF over NBMA networks
  • Configure stub, totally stubby, and not-so stubby areas
  • Configure virtual links
  • Propagate multiple routes into external areas


  • Configuration and Monitoring OSPF
  • Neighbors and Establishing Adjacency
  • Point-to-Point Links
  • Configuring OSPF Over NBMA Networks
  • Configuring Stub, Totally Stub, and Not-So-Stubby Networks
  • Understanding the OSPF Database
  • Configuring OSPF Virtual Links
  • Propagating Multiple Routes into External Areas
  • OSPF 1
  • OSPF 2