OSPF LSA Types:

[boxads] There are different types of link-state advertisements (LSAs) that would be used for Open Shortest Path First (OSPF). This article contains List of OSPF LSA types with a short description. LSAs build up the OSPF link state database (LSDB), and they are exchanged between OSPF enabled nodes. Bellow short description of OSPF LSA types.

LSA Type 1 (Router LSA): LAS type 1 are generated by every router of an OSPF area. They are flooded to all other routers only inside an area of origin & directly connected router. In the link-state ID you will find the originating router’s ID.

LSA Type 2 (Network LSA): LSA type 2 are generated by DR and flooded into the area of origin. The link-state ID will be the router ID of the DR.

LSA Type 3 (Network Summary LSA): LSA type 3 are generated by ABR’s sent into an area to advertise prefixes to other areas & flooded throughout the Autonomous System. Type 3 LSAs are sent between two areas to allow inter-area communication.

LSA Type 4 (ASBR Summary LSA): LSA type 4 are generated by ABR’s that advertises the ASBR & flooded throughout the Autonomous System. The link-state ID will be the router ID of the ASBR.

LSA Type 5 (AS External LSA): LSA type 5 are generated by ASBR that advertises external networks outside the local Autonomous System. Also take the form of a default route to all networks outside the local AS. Type 5 LSAs are flooded to all areas in the OSPF throughout the Autonomous System.

LSA Type 6 (Multicast LSA): This type of LSA is used for multicast OSPF applications. Cisco does not support it.

LSA Type 7 (NSSA External): LSA type 7 are generated by an ASBR inside a Not So Stubby Area (NSSA) to describe routes redistributed into the NSSA.

LSA Type 8 (External attributes LSA For BGP): Used to work with BGP.

LSA Type 9,10,11 (Opaque LSAs): For future use.

OSPF LSA Types Message:

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LSA1s build the Router Link States
LSA2s build the Net Link States (O)
LSA3s build the Summary Net Link States (O IA)
LSA4s build the AS Summary Net Link States (IA)
LSA5s build external route information (E1 or E2)

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