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May
20
comment OSPF and routing by subnet prefix
Correct, LSA2 contains the subnet mask. Any ethernet network will eventually choose the DR which will flood the subnet information to other routers.
May
20
comment OSPF and routing by subnet prefix
LSA type 3,4 is sent by ABR. The question is how ABR learns it form other LSA types? Or suppose you have only one OSPF area. Then how it happens?
May
20
comment OSPF and routing by subnet prefix
What makes me this is that structure of Router LSA normally exchnaged between routers (type 1, type2) does not have this information.