The default-information originate command is used in OSPFv3 configuration mode to originate a default route from the router facing the Internet. The IPv6 default route is represented as ::/0 with a prefix length 0, and it is analogous to the 0.0.0.0/0, the default route used with IPv4. ///////////////
This completes our discussion of OSPFv3 configuration. You may have noticed that we frequently referred to OSPFv2 when introducing OSPFv3 concepts. The reason was that OSPFv3 is so similar to OSPFv2 with certain differences in some areas. It is probably the right time to recap the similarities and differences between OSPFv3 and OSPFv2. ////////////
OSPFv3 works much like OSPFv2 with regard to: /////
Design of areas and related terminology. **
The general idea of enabling the OSPF process and assigning areas to individual router interfaces. **
The neighbor discovery process making use of Hello messages
Transitioning through neighbor states and echange of topology information through LSAs (Link State Advertisement)
The role of full and 2-way states as the normal stable states for functional neighbor relationships, with other states being temporary pointing to some problem.**
The ideas of Type 1, 2, and 3 LSAs and the LSDB (link-state database). ***
The formula used by SPF (shortest-path first) algorithm to calculate interface cost.
OSPF messages sent to reserved multicast addresses (FF02::5 for all OSPFv3 routers and FF02::6 for all DR/BDR routers) similar to the use of 224.0.0.5 and 224.0.0.6 with OSPFv2. ***