In this video we're going to discuss OSPF Version three or open shortest path first version three.
OSPF Version three provides routing capabilities for IP Version six.
Most engineers, when they talk about OSPF are referring to OSPF version two, which provides unicast
routing for IP version four.
However, if you have IP version six addresses configured, you can't use OSPF version two because OSPF
version two only supports IP version four and not IP version six.
OSPF Version three expands on OSPF Version two to provide support for routing IP Version six Prefixes
and Support 428 But IPV six addresses.
There's a lot of similarity between OSPF version two and OSPF version three.
So we have the concept of Lisas, we have the concept of areas and so forth.
But be aware that these protocols are independent of each other.
OSPF Version two will advertise IP version four networks and OSPF Version three is able to advertise
IPV six networks.
They can be configured on the same router but run independently of each other.
In other words, they have separate databases.
They use different addresses for advertisements and they don't communicate with one another.
So here are some examples of similarities between the two protocols.
They are both link state routing protocols.
They both use the same area design concepts and terms.
So we have a backbone area, we have area border routers and autonomous system, border routers and
so forth.
The way that you enable the routing protocol is different in OSPF version three versus OSPF version
two, you're still enabling the routing protocol on interfaces, but in OSPF aversion to you use the
network command, whereas in OSPF version three, you go on to the interface and enable OSPF.
When OSPF is enabled on an interface, the routers can discover one another on directly connected links.
They both check various settings before a neighbor relationship is established.
So as an example, both routers need to be in the same area to form a neighbor relationship and share
the same password.
If authentication has been enabled.
Both protocols use link state advertisements to advertise details of the network, and they both build
link state databases.
They both use the shortest path first algorithm or spoof or Dijkstra's algorithm to determine the best
path to a network.
Networks are based on the cost of an interface with the same default metric based on 100 meg interface.
Alice's are also flooded throughout the OSPF domain, but there are some differences in the losses between
OSPF version two and OSPF version three.
The differences in the aliases and the way the databases are structured are out of the scope of the
CCNA certification.
Both protocols use a 32 bit router ID to identify a router if you're running a pure IPV six network,
which we're going to do in a moment, using this topology, you need to manually configure a 32 bit
router ID on each router.
OSPF version three uses IP version six a link local addresses for neighbor relationships that's different
to OSPF version two, which used IP version for interface IP addresses for the neighbor relationship
establishment.
In OSPF version two, you had to make sure that the neighboring routers were in the same subnet, otherwise
they wouldn't form a neighbor relationship.
But in OSPF version three, the neighbor relationship is now formed using a link local address instead
of an interface IP address.
OSPF Version three Uses Multicast Address F is zero two colon colon five to advertise information to
all OSPF routers and f02 colon colon six for OSPF designated router and backup designated router.
That's very similar to OSPF version two, which uses 2 to 4 005 and 224006.
The same protocol number is used IPV six protocol number is 89 for OSPF version three and OSPF version
two uses IP version for protocol number 89.
So now let's look at how to configure this network using OSPF version three.
This is a pure IP version six network.