In this video we're going to discuss OSPF version 3 or open shortest path first version 3 Always version
3 provides a routing capabilities for IP version 6.
Most engineers when they talk about SPF are referring to OSPF version 2 which provides a unique cost
routing for IP version 4.
However if you have IP version 6 addresses configured you can't use OSPF version 2 because i always
a version two only supports IP version 4 and not IP version 6.
OSPF version 3 expands on OSPF version 2 to provide support for routing IP version 6 prefixes and support
for 128 IP V-6 addresses.
There's a lot of similarity between OSPF version 2 and OSPF version 3.
So we have the concept of elysées we have the concept of areas and so forth but be aware that these
protocols are independent of each other.
We have a version 2 will advertise IP version 4 networks and OSPF version 3 is able to advertise our
PV 6 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 a link state routing protocols they both to use the same area design concepts and terms.
So we have a backbone area we have Area border routers and autonomy system border routers and so forth
the way that you enable the running protocol is different in OSPF version 3 versus OSPF version 2 you're
still enabling the writing protocol on interfaces but in OSPF version to use the network command whereas
in OSPF version 3 you go on to the interface and enable P.F. when OSPF is enabled on an interface the
routers can discover one another on directly connected links.
They both check various settings before and the 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 bold link state databases.
They both use the shortest path first algorithm or SPF or Dykstra is 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
elysées are also flooded throughout the OSPF domain but there are some differences in the less space
between always be a version 2 and OSPF version 3.
The differences in the Alesis and the way the databases are structured are out of the scope of the CCMA
certification both protocols use a 32 bit Rodda ID to identify a router if you are running a pure IP
V-6 network which we can do in a moment.
Using this topology you need to manually configure a 32 bit Rodda ID on each Rodda always be Version
3 users IP version 6 a link local addresses for neighbor relationships.
That's different to be if a version to which used IP version 4 interface IP addresses for the neighbor
relationship establishment in OSPF version 2 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 3 The neighbor relationship is now formed using a link local address instead of
an interface IP address.
OSPF version 3 uses multicast address.
If f is 0 2 colon colon 5 to advertise information to always be for hours and F-F 0 2 colon colon 6
for OSPF designated router and backup designated router.
That's very similar to a version 2 which uses 2 2 4 0 0 5 and 2 2 4 0 0 6 the same protocol number is
used IP version 6 protocol number is 89 for version 3 and always version 2 uses IP version 4 protocol
number 89.
So now let's look at how to configure this network using version 3.
This is a pure IP version 6 network.