Let’s think that there is an area after area 1, and I want that area to receive the LSA type 5 external. If you do area 1 as a totally stub area, then type 5 (as well as type 3) will be blocked. What we can do is to make area 1 as a NSSA, then you will have LSA type 7 allowing the external routes to pass, then the area after area 1 can receive them as type 5. Also, LSA type 3 will not be blocked. That’s the whole idea ????
Let’s configure area 1 as a NSSA.
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