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OSPF Single Area

Written by Rene Molenaar on . Posted in OSPF

Scenario:

AsianFish inc. is expanding their business towards Europe so they need to expand their network as well. You are responsible for the performance of the network and decided that OSPF would be a suitable candidate for a routing protocol. Because the network at this moment is still small, you decided a single area OSPF should be enough. It's up to you to make it work!

Goal:

  • All IP addresses have been preconfigured for you.
  • The following loopback interfaces have been configured:
    HongKong: 1.1.1.1 /24
    Amsterdam: 2.2.2.2 /24
    Barcelona: 3.3.3.3 /24
  • HongKong: Configure OSPF  (process-id 1) and advertise all networks by using a single network statement. Use area0
  • Amsterdam: Configure OSPF (process-id 1) and advertise all networks by using 2 network statements, area0.
  • Barcelona: Configure OSPF (process-id 1) and advertise all networks by using 3 network statements, area0.
  • Optional: the loopback interfaces appear as /32's in the routing table, make sure they appear as /24's just as you configured them.
  • Amsterdam: change the router-id to 22.22.22.22, make sure you see this change from Barcelona by using show commands.
  • Traffic from Barcelona to HongKong should use the link between Amsterdam-Barcelona, use the cost command to achieve this.
  • Remove the previous change with the cost-command, achieve the same goal by using the bandwidth command.
  • Enable clear-text authentication between Amsterdam and HongKong. Use "vault" as a password.
  • Enable MD5 authentication between Barcelona and HongKong. Use "Safe" as a password.
  • Change the OSPF timers on the link between Amsterdam and Barcelona so hello packets are being sent every 5 seconds.
  • The HongKong router will have access to the Internet in the future, you need to advertise a default route in OSPF so Amsterdam and Barcelona will send traffic for unknown networks to HongKong.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

OSPF Single Area Network Topology

Video Solution:

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Comments (5)

  • avatar
    mikodongo

    Hi Rene,

    This lab is fun8). However, i have two questions, what feature make loopback interfaces appear /32 in the routing table and does this have any benefits?

    regards,

    michael

  • avatar
    ReneMolenaar

    Hi Michael,

    If you are working on this lab I'm guessing you are studying for CCNA?

    OSPF uses multiple "network types". You will learn about those in CCNP. One of them is "loopback" and OSPF will always advertise a loopback as /32. Type the show ip ospf interface loopback0 command and it will show you the OSPF network type.

    In a way it makes sense because there is nothing more than a single IP address on a loopback interface. Even though you configure a /24 you won't find 200+ IP addresses there.

    It will save you some address space (we don't care about that all that much with private IP address space) but it could be useful when you play with most specific routing.

    Good luck!

    Rene

  • avatar
    oaljohi

    I want to thank you to give us small review in OSPF. I have forgot the LOOPBACK and Authentication and how to control them.:):)

  • avatar
    Affy888

    Hi Rene . Earlier there was an option to download the PDF. Its no longer available. Have you removed all the PDFs?
    thanks