Yes distributed routes can exist in the NSSA only when they are directly injected from ASBR (which exists within the NSSA area).
Perhaps there is some aspect of the rest of your question that I do not quite grasp. But in my experience a "default" route is always a 0.0.0.0 route.
Who would be creating the summary route of the distributed subnet? If the distribution is in area 0 then the summary must be in area 0. And neither the distributed subnet nor its summary would be advertised from area 0 into an NSSA area.
If you are asking about some aspect that I have not grasped then perhaps you can clarify the question.
being the NSSA a stub area if the ABR router is configured to inject a default-route into the NSSA area:
router inside the NSSA sees a 0.0.0.0/0 route originated by ABR node of type O IA or O N2 (not sure about this it shoulddepend from some factors: O N2 if using default-originate option, O IA if using no summary option).
The key point is that the real OSPF default route (O E2 or O E1) used in the OSPF domain cannot be passed in the NSSA area there is no exception to the block of O E1 and O E2 routes at area boundary, not even for the default route.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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