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OSPF Totally Stub

Written by Rene Molenaar on . Posted in OSPF

Scenario:

This lab is a follow-up of the OSPF Stub lab. I'd recommend you configure that lab before this one.

The company specialized in selling Fantasy E-books is becoming more popular everyday and after your trainee period they decided to offer you a job. They still don't have any money to upgrade their network equipment and they are still experiencing problems with big routing tables... time to tune OSPF some more!

Goal:

  • All IP addresses have been preconfigured for you.
  • Configure OSPF on both routers, use the Area's as specified in the topology picture.
  • Router Algrim: Loopback0 should be in Area0
  • Achieve full connectivity.
  • Router Algrim: create additional loopbacks:
    L1: 172.16.0.1 /24
    L2: 172.16.1.1 /24
    L3: 172.16.2.1 /24
    L3: 172.16.3.1 /24
  • Advertise these networks into OSPF Area 0.
  • Take a look at the routing table of Router Barik, you should see all 4 networks. Make sure you can ping them.
  • Change the area type of Area 1 so you don't see the 4 networks anymore but only 1 default route.
  • Make sure you can still ping the 4 networks.

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

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IOS:

c3640-jk9s-mz.124-16.bin

Topology:

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Video Solution:

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Comments (7)

  • avatar
    greatidea
    2011-03-15 06:03:08

    Hi,

    I observe that there is no ospf configuration in the attached router's configs

  • avatar
    WezVR
    2012-06-13 05:40:58

    Hi,

    Is it necessary to add the area 1 no summary command to both routers or can it be applied to the ABR (Algrim) only?

  • avatar
    ReneMolenaar
    2012-06-18 12:41:34

    The no summary command only has to be applied to the ABR. Not sure what I did in the video but we only need it on the ABR.

  • avatar
    garffff
    2012-09-27 05:54:46

    Hi Rene,
    The way I was taught to do a Totally sub area was to do the no summary command on the ABR and then just the stub command on the other routers. I can see both ways achieve the same thing.

    I understand as well for neighbours to form the Stub flag needs to match.

  • avatar
    ReneMolenaar
    2012-11-07 12:42:10

    That is correct, you only need the "no-summary" on the ABR because that's the one generating the default route. The normal area routers can be normal "stubs".

  • avatar
    keithsistrunk
    2013-03-27 18:48:44

    I have all of the config correct Except the Totally Stub command... I can not make out what the Video is showing... Could some one post Exactly what to type into R1.... Thanks

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