1. Type 1: Router LSA
   1. Directly connected Links
      1. Identity of Link: IP Prefix on an interface
      2. Identity of Link: Link Type
         1. Point to Point
            1. Link ID: Neighbor router ID
         2. Transit network connection
            1. Link ID: IP Address of DR
         3. Stub network connection
            1. Link ID: IP Network
         4. Virtual Link
            1. Link ID: Neighbor router ID
   2. RLSA always stays within an Area
2. Type 2: Network LSA
   1. Created for each multi-access network
   2. Generated by Designated Router (DR)
   3. Contents:
      1. Routers connected to multi-access network
      2. Designated Router (DR) id
      3. IP Prefix and subnet mask
   4. NLSA always stays within an Area
3. Type 3: Summary LSA
   1. Floods into other Areas
   2. Summary of inter-area prefixes
      1. "O IA" in routing table identifies a SLSA
4. Type 4: Summary ASBR LSA
   1. Generated by Area Border Router (ABR)
   2. Flooded into Area 0 and all other Areas
      1. Required so all OSPF routers know where ASBR is located
5. Type 5: Autonomous System External LSA
   1. Generated by Autonomous System Border Router (ASBR)
   2. External Prefixes
      1. "O E1" or "O E2" in routing table identifies ASE-LSA
      2. Prefixes redistributed into OSPF
   3. Not-So-Stubby Areas (NSSA) block Type 5 ASE-LSA's
6. Type 6: Multicast OSPF LSA
   1. Not being used nor supported by Cisco
   2. Protocol Independent Multicast (PIM) used for multicast configurations
7. Type 7: Not-So-Stubby Area LSA
   1. Generated by Autonomous System Border Router (ASBR)
   2. Workaround for Type 5 LSA's blocked by NSSA
   3. Carries same information as Type 5 LSA
   4. Translated to a Type 5 LSA by Area Border Router (ABR)
      1. Flooded into other Areas
8. Type 8: External Attribute LSA For BGP