Packet tracer OSPF issue

[thajiyev9]

Hello!

I have an issue about OSPF in packet tracer. I upload my topology. There are 5 router in my network and R4 connected to R5(ISP). So that, I have default route to isp and originate it in ospf. R2 get this default route with 2 different way.  When i ping from R1 to R5, if R2 using route via 10.10.12.0, it cause problem. I dont want default route via 10.10.12.1, only want to use 10.10.24.4. Changing bandwith and ospf cost didnt change anything.
Edit:
English is not my mother tongue, so I apologize for writing mistakes.

[Georg Pauwen]

On a side note, you can save the Packet Tracer project file as a .jpg file and then post it...

[thajiyev9]

Here is my pkt file :)
https://drive.google.com/open?id=1v5kCY1lk71jAyt8PTrpG0tvN-reQI7an

[Georg Pauwen · Accepted solution]

Hello,

the problem is that Packet Tracer does not really simulate 'real' IOS devices, but rather executes a number of commands and displays pre-programmed results.

If you lab this is e.g. GNS3, your router R4 would not even generate a default route (to R2 and R3) because there is no default route existing in the routing table. You would need to add the 'always' keyword to the 'default-information originate' command for the default route to be installed regardless of its existence in the routing table. Also, having to paths is not happening in a real network. I don't know why Packet Tracer installs both default routes.

Conclusion: forget about it and lab this in GNS3 to get more reliable results.

[Julio E. Moisa · Accepted solution]

Hi

It looks like a bug on the PT, if you verify the routing table on R2 it shows the same metrics for both default routes and from R1's perspective it learns one of the 2 paths until you execute: show ip ospf process <yes>.

I changed the area number to zero and it fixed the trouble, probably it is related with multi-areas on packet tracer. 

[thajiyev9]

Hi!

There are so bugs in PT and probably i will use GNS3. Tomorrow i will change areas and try show commands.

Thank you for help !

[thajiyev9]

Hi!

Yeah, some commands not working and bugs make problems for my work. Probaby i will start to use GNS3.
Thank you for detailed explanation

[Julio E. Moisa]

Hi

It could be, currently im creating a lab with real devices, i will keep you posted. 

[thajiyev9]

Hi,

I would be grateful.

[Julio E. Moisa]

Hi,

Definitely your configuration is ok and the trouble is with packet tracer with multi-area. I tested your same configuration on real devices and they worked as expected.

:-) 

[thajiyev9]

Hi,

I am so happy that the problem is the packet tracer. :D Thank you for your help and explanation.
:)

[Julio E. Moisa · Accepted solution]

Hi

You are welcome :-) 

Yes it could be a bug on PT.

Have a great new year.