OSPFv3
Take a look at Table 10.5.
The new version of OSPF continues the trend of the routing protocols having many similarities
with their IPv4 versions.
The foundation of OSPF remains the same—it is still a link-state routing protocol that divides
an entire internetwork or autonomous system into areas, making a hierarchy. And just trust me—
be really thankful that multiarea OSPF is out of scope for the CCNA objectives—at least, for now!
In OSPF version 2, the router ID (RID) is determined by the highest IP addresses assigned
to the router (or you could assign it). In version 3, you assign the RID, area ID, and link-state
ID, which are all still 32-bit values but are not found using the IP address anymore because an
IPv6 address is 128 bits. Changes regarding how these values are assigned, along with the
removal of the IP address information from OSPF packet headers, makes the new version of
OSPF capable of being routed over almost any Network layer protocol—cool!
Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses
multicast traffic to send its updates and acknowledgments, with the addresses FF02::5 for
OSPF routers and FF02::6 for OSPF-designated routers. These new addresses are the replacements
for 224.0.0.5 and 224.0.0.6, respectively.
TABLE 1 0 . 5 IPv6 OSPF Commands
Command Meaning
(config)#ipv6 router ospf process_id Enables the OSPF database on the router
(config-rtr)#router-id a.b.c.d Sets the RID of the router
(config-if)#ipv6 ospf process_id area area Configures the area for the interface
Other, less flexible IPv4 protocols don’t give you the ability that OSPFv2 does to assign specific
networks and interfaces into the OSPF process—however, this is something that is still
configured under the router configuration process. And with OSPFv3, just as with the other
IPv6 routing protocols we’ve talked about, the interfaces and therefore the networks attached
to them are configured directly on the interface in interface configuration mode.
The configuration of OSPFv3 is going to look like this:
Router1(config)#ipv6 router osfp 10
Router1(config-rtr)#router-id 1.1.1.1
You get to perform some configurations from router configuration mode such as summarization
and redistribution, but you don’t even need to configure OSPFv3 from this prompt if
you configure OSPFv3 from the interface.
When the interface configuration is completed, the router configuration process is added
automatically. and the interface configuration looks like this:
Router1(config-if)#ipv6 ospf 10 area 0.0.0.0
So, if you just go to each interface and assign a process ID and area, poof, you’re done!
With all that behind you, it’s now time to move on and learn about how to migrate to IPv6
from IPv4.