Free CCNA Lab Basic OSPF Configuration


In this lab activity, you will learn to configure the routing protocol OSPF using Packet Tracer and the network shown in the network diagram. The segments of the network have been subnetted using VLSM. OSPF is a classless routing protocol that can be used to provide subnet mask information in the routing updates. This will allow VLSM subnet information to be propagated throughout the network.

Learning Objectives:

Upon completion of this lab, you will be able to:

  • Perform basic configuration tasks on a router
  • Configure and activate interfaces
  • Configure OSPF routing on all routers
  • Configure OSPF router IDs
  • Verify OSPF routing using show commands
  • Configure a static default route
  • Propagate default route to OSPF neighbors
  • Configure OSPF Hello and Dead Timers
  • Configure OSPF on a Multi-access network
  • Configure OSPF priority
  • Understand the OSPF election process
  • Document the OSPF configuration


Short for Open Shortest Path First, an interior gateway routing protocol developed for IP networks based on the shortest path first or link-state algorithm.

 Routers use link-state algorithms to send routing information to all nodes in an internetwork by calculating the shortest path to each node based on topography of the Internet constructed by each node. Each router sends that portion of the routing table (keeps track of routes to particular network destinations) that describes the state of its own links, and it also sends the complete routing structure (topography).

The advantage of shortest path first algorithms is that they results in smaller more frequent updates everywhere. They converge quickly, thus preventing such problems as routing loops and Count-to-Infinity (when routers continuously increment the hop count to a particular network). This makes for a stable network.

The disadvantage of shortest path first algorithms is that they require a lot of CPU power and memory. In the end, the advantages outweigh the disadvantages.

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2 Responses to “Free CCNA Lab Basic OSPF Configuration”

  1. Rob says:

    You screwed up the addresses for PC1 and R1 F0/1. and with a /28 mask puts them on different subnets

    • Barry says:

      You are right sorry about that but think you got some troubleshooting along with the configuration. Thanks again for pointing that out.

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