OSPFv3 LSAs
OSPFv3 and OSPFv2 use a similar set of LSAs, but version 3 has a few
changes from OSPFv2. Types 3 and 4 have been slightly renamed, but still
fulfill the same functionality as they did with OSPFv2. Type 8 is new and
assists in discovering neighbors. Types 1 and 2 no longer pass routes.
Instead they pass router IDs. Prefixes are associated as leaf objects that hang
off those nodes and are advertised using Type 9, which is also new.
LSAs are sourced from the link-local address of an interface and destined
for a multicast address. FF02::5 is the “all OSPF routers” address and
FF02::6 is the “all OSPF DRs” address.
The OSPFv3 LSA types are collected together in Table 8-1. Notice that
types one through seven exactly match their OSPFv2 predecessor, while
type 8 and type 9 are new to OSPFv3.