i created a network in Packet Tracer, so that the various OSPF-Area Types can be used and tested.
There is also a NSSA-Area (which also could be converted into a usual area) with an ASBR (BGP).
When i look at the routing of a router not in the same area table i do not find the external route.
Also the ASBR does not receive any summary like in a stub area on the same network where it works as proposed.
To evaluate this problem i provide the network Packet-Tracer file.
Be sure to let some time for ospf to converge.
After some time Router4 shows a expected routing table, containing all ospf routes and one external nssa-route.
But looking at Router9 the routing-table shows some ospf-routes but not all and not a default-route as i would epxect with no-summary.
And looking at Router3 there are all ospf-routes but no external ones...
But in the ospf database at Router3 the ASBR is not unknown, so the Router4 does announce the ASBR.
But it should also propagate external routes into area 0.
Can someone help me with that?
Perhaps it is some ospf understanding problem or packet tracer problem...