OSPF LSA Types:

OSPF LSA Types:

Type 1 LSA: Router LSA:

Router LSAs are generated by every router. The router LSA is a list of links attached to the router, as well as the state of the link and the outgoing OSPF cost associated with the link.

Scope: Area

#Show ip ospf database router

Type 2 LSA: Network LSA:

Network LSAs are generated by the DR on a multi-access segment.

Scope: Area

# show ip ospf database network

Type 3 LSA: Network Summary LSA:

Network summary LSAs are generated by ABRs.

Scope: Area

# show ip ospf database summary

Type 4 LSA: ASBR Summary LSA:

ASBR summary LSAs are also generated by the ABR. This LSA describes the location of an ASBR and the cost to reach it.

Scope: Area

# show ip ospf database asbr-summary

Type 5 LSA: External LSA:

AS LSAs are originated by the ASBRs and describe a network outside of the AS.

Scope: Entire OSPF Domain

# show ip ospf database external

Type 7 LSA: NSSA LSA:

NSSA LSAs are originated by the ASBR within the NSSA.

LSA Type 7 gets converted to LSA Type-5 when going out of NSSA area by ABR.

Scope: NSSA Area

#show ip ospf database nssa-external