Yes, the area type (e.g. stub) is sent in the E bit in hellos between routers. A neighbor will only be formed if two routers have the same E bit setting (i.e. stub or non-stub). The no-summary option is only required on the ABRs.
A stub no summary is a totally stubby area, while a stub is a "normal" stub. They should work together, but I wouldn't do this--why would you want to define the area as two different types of stub areas at the same time?
I am just adapting to what is existing..My part is the new L3 switch to be sandwich in between the old L3 and old router and i just found that their area type differs..the switch is stub no-summary and the router is jus stub.
Yes you are correct, the key thing is to have all areas within an area configured as stub, if you want stub functionality. To confirm which one is your ABR, please do a sh ip ospf and it will be displayed.
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