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 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 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.