Six LSA types. Zero panic.
Who makes it, what it describes, and where it travels.
Think of an LSA as one piece of the shared map. Each area has its own link-state database. An ABR participates in multiple areas and originates information at their boundaries.
The numbers below describe common OSPFv2 LSAs. OSPFv3 uses different LSA names and encodings.
1Router LSA - The NarcissistI only talk about myself. Constantly.→2Network LSA - The Chosen oneI speak for the group because I got Chosen.→3Summary LSA - The Very Selective GossipOnly the details you need.→4ASBR Summary LSA - I know a guyI know a guy.→5External LSA - The DossierNews from outside OSPF.→6MOSPF LSA - The Uninvited OneThe LSA no one needs.→7LSA 7 - NSSA External LSA - The master of disguiseLSA 7 is basically the same kind of information as LSA 5. Just wearing a disguise.→