Quick Notes - OSPF LSA Types

LSA Types

Type 1 - Router
Type 2 - Network
Type 3 - Network Summary
Type 4 - ASBR Summary
Type 5 - AS External
Type 7 - NSSA External

Router LSA Type 1 - Includes a list of all routers links and their states. Flooded in the area they are originated in

Network LSA Type 2 - DR produces these LSA on every multi-access network.Includes all routers including the DR. Flooded in the area they are originated in.

Network Summary LSA Type 3 - Generated by ABR and advertises destinations outside of the area. Flooded throughout the AS

ASBR Summary LSA Type 4 - Generated by the ABR, provides a gateway to type 5 LSA. Flooded throughout the AS

AS External LSA Type 5 - Generated bt ASBR, advertises external destinations or a default route to a external destination. Flooded throughout the AS

NSSA External LSA Type 7 - Generated by ASBR in a not-so-stubby area