Key points:
Each router generates a type 1 LSA (Router LSA) and sends it to the DR
DR
generates type 2 LSA (Network LSA) and sends it to all routers
LSA 3 (Network
Summary LSA)as generated by Area border router (ABR). It includes prefixes from
other area (inter-area)
LSA 1 and LSA 2 always stay within that particular area
OSPF Area Types:
Normal
Stub
Totally
Stubby
Not-so-stubby
Totally not-so-stubby
Normal Area:
Contains LSA types 1,2,3,4 and 5