Some details of how you have configured this OSPF would be helpful. The symptoms sound like you have configured NSSA with the no summary option. Using the no summary option will result in type 3 summary routes not being advertised into the NSSA area. Routers within the NSSA do not see individual routes from area 0 but use the default route to access all resources in area 0 (and in other OSPF areas if they exist).
So it sounds like that is what you have done. If you provide the configuration details we can confirm if this is the case.
It's hard to say for sure what's causing your problem without looking at the rotuer config(s) or some other show command output. However, the problem you describe may be a result of nssa forwarding address problem. Take a look at this link for more info on what it means and whether this is the reason for your issue.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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