Network-LSAs (Type 2)
Network-LSAs only exist in broadcast networks or NBMA networks and are generated by
DRs (Designated Routers) in a network. They describe the information about all the routers
connected in specified areas on a network. Like Router-LSAs, Network-LSAs also only
indicate link-state information and do not record network address information. Network-LSAs
and Router-LSAs describe the link topology of areas together.
Inter-Area-Prefix-LSAs (Type 3)
Generated for an area by the ABRs in the area and used to describe the network information
about reaching other areas. They replace type 3 summary-LSAs in OSPFv2. In contrast to
the OSPFv2, destination network information is described with a prefix structure.
Inter-Area-Router-LSAs (Type 4)
Generated for an area by the ABRs in the area, used to describe the path information about
reaching the ASBRs in other areas, and replacing type 4 summary-LSAs in the OSPFv2.
AS-external-LSAs (Type 5)
This type of LSAs are generated by ASBRs and used to describe the network information
about reaching outside AS. Usually, the network information is generated through other
route protocols. In contrast to the OSPFv2, destination network information is described with
a prefix structure.
NSSA-LSA (Type 7)
Their function is the same to that of type 5 AS-external-LSAs. However, they are generated
by ASBRs in the NSSA area.
Link-LSAs (Type 8)
In the OSPFv3, the newly added LSA type is generated by each device for each connected
link and describes the local link address of the device in the current link and all set IPv6
address prefix information.
Intra-Area-Prefix-LSAs (Type 9)
In the OSPFv3, the newly added LSA type provides additional address information for
Router-LSAs or Network-LSAs. Therefore, it has two effects:
1. Associate network-LSAs and record the prefix information of a transit network.
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