OSPF LSA type

LSA type 1 – Router LSAs are sent from a router to other routers in the same area. It contains information regarding the routers interfaces in the same area, relevant interfaces IPs, its adjacent routers on those interfaces and sub networks

LSA type 2 – Network LSAs are generated by the DR on a multi access segment, and provides similar information to an LSA type 1 for the multi access segment and subnet which it belongs
LSA type 3 – Network Summary LSAs are generated by ABRs and contain the subnets & costs but omit the topological data from all subnets in one area and sent to another area via the ABR
LSA type 4 -ASBR summary LSAs are from ASBRs and are identical in structure to a type 3 LSA and sent when crossing an AS boundary
LSA type 5 -Are AS external LSAs which are originated by ASBRs and describe external networks
LSA type 6 – Is defined as a Group Membership LSA but not used in Cisco devices
LSA type 7 -NSSA External LSAs are generated by the ASBR in an NSSA area
LSA type 8 – Is defined as a External Attribute LSA but not used in Cisco devices
LSA types 9 to 11 – Defined as Opaque LSAs and are reserved for future expansion

ref.: http://communitystring.com/2008/07/ospf-lsa-types/

Area Type	Type 1 & 2 (within area)	Type 3 (from other areas)	Type 4	Type 5	Type 7
Standard & backbone	Yes	Yes	Yes	Yes	No
Stub	Yes	Yes	No	No	No
Totally stubby	Yes	No	No	No	No
NSSA	Yes	Yes	No	No	Yes
Totally stubby NSSA	Yes	No	No	No	Yes

ref.: https://learningnetwork.cisco.com/docs/DOC-7924