How to configure OSPF Stub Area

ah don’t do that Rene you already are very responsive and take care of the website. Save your time for important stuff it was small inconvenience only I just glossed over the names and focused on specific granular that I was having problems with but makes me feel bad if you try to do something that difficult in the time consuming meticulous area.

I think its fine. I saw in another post once where someone griped about named routers and maybe some truth but then you said you might change it then you went back and fixed it. That had repercussion of making some of the forums post be off no biggie you was just being too helpful lol! I would not worry about changing all past things unless its something that is easy and efficient just use new method going forward.

You are to important to all of us to be spending your time trying to read through things you have already worked on in the past and only a limited number of the hardcore study people will read through.

Your website is already the best out there for content, and for team that is responsive to replying and helping. I am a professional student as I love to learn I would not pull your leg or inflate your ego.

This is hands down the best networking site with content and forums. Not many people with your knowledge and ability would do what you do to the level you do it. Oh and lets give credit to those moderators as well like Las and Andrew. Great team!

Hands down the most cost efficient way to learn about Cisco Networking this site is worth double or triple what you charge but I am thankful you give the people such a great deal. I am a happy person by nature but I am also a very honest person and I am not a person that believes in being inefficient and wasting my time talking up their company because I like them or was just being nice. No that’s all truth.

I think we will all live =)

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Yes that is helpful I do understand your diagram. Thanks!

Hi Rene,
That was mind blowing. Clear concept indeed . The stub/Totally Stub concerned to how many exit point from a area .The NSSA/Totally NSSA needed when ASBR needed on a area .Thx

br//zaman

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Hi Rene,
I am trying to replicate the same scenario in lab, but the loopback network is not being redistributed.
on R1:

interface Loopback0
 ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
 ip address 192.68.12.1 255.255.255.0
 duplex auto
 speed auto
router ospf 1
 log-adjacency-changes
 redistribute connected subnets
 network 192.168.12.0 0.0.0.255 area 0

Could you please guide as to what i am missing?
Thanks

Hi Rajani,

Your config looks OK. You do have a working neighbor adjacency between R1 and the other router?

You can also verify that it’s in the LSDB of R1:

R1#show ip ospf database external 

            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Type-5 AS External Link States

  LS age: 1127
  Options: (No TOS-capability, DC, Upward)
  LS Type: AS External Link
  Link State ID: 1.1.1.0 (External Network Number )
  Advertising Router: 1.1.1.1
  LS Seq Number: 80000001
  Checksum: 0xA5F3
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        MTID: 0 
        Metric: 20 
        Forward Address: 0.0.0.0
        External Route Tag: 0

Rene

Hi Rajini,

Looks like you have wrong IP configured on your Fa0/0 (192.68.12.1) and distributing 192.168.12.0
you can change the interface IP address of fa0/0 and you can see the Loopback being redistributed.
hope this helps

simple question :slight_smile:

area type must match on both routers to establish an adjancency ?

Hello Juan

Yes that is correct. The area type must match in order for an adjacency to occur.

Laz

sir
please confirm this line you want to say that like:
ABR router which is in area 1 we have configured as a totally stub area so in area 1 all stub routers which is directly connected with ABR router has an exception of LSA 3 means totally stub area rule NO TYPE 3 SUMMARY LSA will not apply in stub area so that’s why we can see IA in R3 ospf routing table

Hello Harshit

Yes your explanation sounds right. You can find out more about totally stub areas at this lesson:

I hope this has been helpful!

Laz

I understood better with this example :rofl::rofl::rofl:… thank you Rene