OSPF Version 3

OSPFv3 is a modified version of OSPF that supports Internet Protocol version 6 (IPv6) addressing. OSPFv3 differs from OSPFv2 in the following ways:

All neighbor ID information is based on a 32-bit router ID.
The protocol runs per link rather than per subnet.
Router and network link-state advertisements (LSAs) do not carry prefix information.
Two new LSA types are included: link-LSA and intra-area-prefix-LSA.
Flooding scopes are as follows:
- Link-local
- Area
- AS
Link-local addresses are used for all neighbor exchanges except virtual links.
Authentication is removed; the IPv6 authentication header relies on the IP layer.
The packet format has changed as follows:
- Version number 2 is now version number 3.
- The db option field has been expanded to 24 bits.
- Authentication information has been removed.
- Hello messages do not have address information.
- Two new option bits are included: R and V6.
Type 3 summary LSAs have been renamed inter-area-prefix-LSAs.
Type 4 summary LSAs have been renamed inter-area-router-LSAs.