Answer Posted / jm

LSA = link state
Following are the types of LSAs you would usually find in an
OSPF network:
Type 1: router LSA -- A router sends this to describe
neighbors and its own interfaces.
Type 2: network LSA -- For broadcast networks only; this LSA
is flooded by the DR and lists OSPF-speaking routers on the
network.
Type 3: network summary LSA -- Sent by an ASBR to advertise
networks reachable through it. A stub area router will also
use this for the default route.
Type 4: ASBR-summary LSA -- Sent by ASBR, but only
internally. This describes to the others how to get to the
ASBR itself, and uses only internal metrics.
Type 5: AS-external LSA -- Used to describe external routes
to internal areas. Can be used to advertise “this is the way
to the Internet” (or some subset of).
Type 6: Group summary -- Used in multicast (MOSPF). Ignore
this.
Type 7: NSSA area import.
Type 8: External Attributes LSA –- This is very rarely
deployed and is used when BGP information is carried across
OSPF AS.
Type 9, 10, 11 are Opaque LSAs -- They are designated for
future specifically for application specific purpos

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