OSPF LSA Types

LSA TYPE	Name	Description
1	Router LSA	A Router-LSA includes information about the link states of all of a router's interfaces. These LSAs are flooded throughout the area, but not into adjacent areas.
2	Network LSA	On NBMA and broadcast capable network segments, the DR originates Network-LSAs. The Network-LSA describes the routers that are connected to this broadcast or NBMA segment. Network-LSAs are flooded throughout the area, but not into adjacent areas.
3	Summary LSA ABR	ABR routers originate Summary-LSAs to describe interarea routes to networks that are outside of the area but inside of the AS. They are flooded throughout an area. Type 3 LSAs are used for routes to networks.
4	Summary LSA ASBR	Type 4 LSAs are similar to Type 3 LSAs, except that they are used for routes to ASBR routers.
5	AS-external-LSA	ASBR routers originate Type 5 LSAs to describe routes to networks that are external to the AS. Type 5 LSAs are flooded throughout the AS.
6	MOSPF-LSA	Type 6 LSAs are used for carrying multicast routing information with MOSPF. Cisco routers do not currently support Type 6 LSAs.
7	NSSA-External-LSA	Type 7 LSAs are originated by ASBRs in an NSSA area. They are similar to Type 5 LSAs, except that they are only flooded throughout the NSSA area. When Type 7 LSAs reach the ABR, it translates them into Type 5 LSAs and distributes them to the rest of the AS