because you dig on them... according to doyle...
Type 1 (Router LSAs) are originated by every router and describe the originating router, the router’s directly connected links and their states, and the router’s neighbors.
Type 2 (Network LSAs) are originated by Designated Routers on multiaccess links and describe the link and all attached neighbors.
Type 3 (Network Summary LSAs) are originated by Area Border Routers and describe inter-area destinations.
Type 4 LSAs (ASBR Summary LSAs) are originated by Area Border Routers to describe Autonomous System Boundary Routers outside the area.
Type 5 (AS External LSAs) are originated by Autonomous System Boundary Routers to describe destinations external to the OSPF domain.
Type 7 (NSSA External LSAs) are originated by Autonomous System Boundary Routers within not-so-stubby areas.
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