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[AUDIO LOGO]

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Now that we've looked at some
of the details of OSPF version

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three, it's time to jump in to
the command line and get it up

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and running.

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So let's begin by looking
at our topology again.

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So we have an idea where
we need to configure it,

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on which routers and
which interfaces.

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And then we'll jump
into the command line

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and get OSPF version
configured on the routers that

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still need it.

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So once again, we'll
be using OSPF version

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three topology one.

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So have this handy
as we go through.

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And what we need
to configure here

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is routers six, one and two.

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The other routers
here should already

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be configured with
basic OSPF routing.

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In other words, they're
not doing authentication

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or anything like that.

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Just the basic OSPF
implementation.

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Also keep in mind as
we go through here,

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IPv6 addresses are
already configured

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on all of the interfaces
including on routers one, two

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and six.

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And also on iOS XE
such as router six

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here, IPv6 unicast routing
has also already been enabled.

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So we will literally just be
configuring OSPF version three.

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So let's go ahead
and get started.

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We'll jump into the
command line on router one.

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So as we'll see as we go
through this configuration,

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this is actually very similar
to configuring OSPF version two.

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So of course, we go
into configuration mode.

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Now here's of course,
the big difference.

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We're going to say OSPF
version and then give it

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a process number.

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We're going to go ahead and
configure our router ID.

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We go into our area.

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So we'll configure area zero
first here on router one.

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We'll put our loopback
interface in area zero.

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And let's go ahead and do
passive enable on that.

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No need to send hellos and
search out that interface.

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Then we'll go into
interface gig 0/0/0/1.

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This is also an area zero.

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This one, however, is going to
be a point to point interface.

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So we simply configure
point to point.

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And then interface gig
0/0/0/3 goes in area zero.

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But this is a multi
access network,

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so it does not get
point to point.

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That you take care of area zero.

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So let's configure area 100.

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This gets interface gig 0/0/0/0.

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This is also point to point.

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That should take care
of this configuration.

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Let's go ahead and
commit our changes.

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We see some neighborships
already coming up.

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So our neighborship with
router seven and router three

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have both come up.

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We wouldn't expect our
neighborships with router two

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and router six yet
because of course, we

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haven't configured those.

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So let's exit out of
configuration mode

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and let's just do
some verification.

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So let's start with just to show
OSPF version three interface

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brief.

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We see that we
have R1 interface,

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gig 0/0/0/0 in area 100.

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And we see that our other
interfaces, gig 0/0/0/1,

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0/0/0/3, and loopback
0 are all in area 0.

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We also see that they're
configured as either point

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to point.

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Or we see in the
case of gig 0/0/0/3,

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that it has been elected as the
BDR on that particular segment.

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So that looks good.

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Let's go ahead and
verify our neighbors.

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We can see, of course, that we
have neighborships with router

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seven and router three.

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Now, we saw those
come up, of course.

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So this would have been expected
but we just want to verify.

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So these are both up.

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We can also see here
where router seven has

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been elected as the DR.
Which makes a lot of sense

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because we're the BDR.

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And at the moment there's
only those two routers

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active on that multi
access segment.

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Let's also do a show
OSPF three route.

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This is looking at the OSPF RIB,
or routing information base.

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These are the routes that are
going to be eligible for entry

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into the routing table.

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Of course, we can
also verify this

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by doing a show route IPv6,
and we'll filter that by OSPF.

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So we can see here that we are,
in fact, learning OSPF routes

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in our routing table for IPv6.

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So, so far, everything
is looking good.

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So it looks like
it's probably time

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to go configure router two.

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Router two, of
course, is going to be

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a very similar configuration.

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Going to router OSPF.

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Router ID of course,
will be different.

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Here we have
interfaces in area 100,

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which is where we will put
our loopback interface.

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Once again, we'll
passive enable that.

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Gig 0/0/0/0 also
goes into area 100.

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This one is point to point.

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Gigabit 0/0/0/1,
not point-to-point

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because it's again, a
multi access network.

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Here we also have an area 1,000.

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And in this one we have
interface gig 0/0/0/2.

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This one is also a
point-to-point link.

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That should take care
of the configuration.

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Let's commit the changes.

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Once again, we see neighborships
already coming up with routers

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five, and four, and nine.

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We see router one here
just came up as well.

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We'll verify our interfaces.

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So all of our interfaces are
in area 100 except for gigabit

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0/0/0/2, which is in area 1,000.

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And we see in the case of
our multi access network that

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gigabit 0/0/0/1, we've
been elected as the DROther

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or the DROther on that
multi access segment.

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Clearly, routers four
and five on that segment

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have already been elected
as the DR and the BDR.

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Let's also verify our neighbors.

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We saw them all
come up, but we just

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want to make sure
rather than just

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looking at console messages.

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So here we're up
with router one,

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router four, router
five and router nine.

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So this looks like
all of our neighbors

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are up here on router two,
so this will bring us over

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to router six.

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So here on router six,
since it's running IOS XE,

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there's actually
two different ways

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to configure OSPF
version three on IOS XE.

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There's sort of the legacy way
and well, the more modern way.

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I'm going to show
you the legacy way

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first just so you've
seen it in case you ever

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run into it in the field.

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So you understand
what's going on

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and understand that
there's two different ways

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to configure this.

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And then of course,
we'll back that out.

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And then we'll implement
the more modern way,

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which is really how you
should be implementing it.

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Sort of the biggest reason
for that is the newer way

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allows you to do multi-protocol.

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It allows you to
do IPV4 and IPv6.

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The legacy way only
allows you to do IPv6

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because that was the original
intention of OSPF version

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three.

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So let's go ahead and take
a look at that old way first

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and then we'll jump
into the new way.

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So the old way was would start
with IPv6 and then say router.

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So instead of just
saying router OSPF V31,

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it's IPv6 router OSPF one.

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And you don't say V3 here.

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So you just hit Enter.

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And then this is where you would
go ahead and configure things

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like your router ID and so on.

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And then you go
to your interfaces

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and you configure this
in a similar fashion.

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The problem with this is since
it starts off IPv6 router, that

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locks us in to IPv6.

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Because there is no
IP router command,

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it's just router OSPF one.

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And if I said
router OSPF one, I'd

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be enabling OSPF version two.

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So again, this isn't really
how we want to configure it.

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But just be aware
that this structure

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does exist in the command line.

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And you can still,
at least right now,

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configure OSPF version
three this way.

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We of course, don't
want to do that.

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We'll take that back out.

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And we'll configure it
the modern way where

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we say router OSPF V3 and
then give it a process number.

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Then we configure the router ID.

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Now here the configuration
is a little bit

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different than IOS XR.

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For example, if we want
to say pass loopback 0,

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we put it right here.

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It's not under the loopback
interface configuration.

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And then we go configure
the interfaces themselves.

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Not much goes under the
global process here on IOS XE.

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So we go into
interface loopback 0.

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Then we just say OSPF V3.

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We put in our process number.

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And notice that we can now
configure either IPv4 or IPv6

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here.

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Now, we're just going
to be focusing on IPv6.

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So we'll say IPv6.

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But notice that IPv4 is
in fact an option and this

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is how you would
go configure it.

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And we want the loopback
here to be in area 0.

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We also need to configure
interface gigabit one, which

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also goes into area 0.

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Interface gigabit two.

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Gigabit two actually
goes into area 200.

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And it's a point to
point network type.

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So we see up above here that
routers one and seven had

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already come up as neighbors.

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And we see that now router
10 has come up as a neighbor

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as well.

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Once again let's do some
verification here on IOS XE.

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So we can say show
IPv6 route OSPF.

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Verify the IPv6 routing table.

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We see here that we
have a lot of entries.

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We're not going to go through
every single one of them.

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But generally speaking,
we have routes here.

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Show OSPF V3 interface brief.

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We see that we have our
interfaces configured properly.

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Again two of our interfaces
in area 0 and one of them

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in area 200.

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Also note that our gigabit
one is a DROther interface.

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Which again, would be
expected because we already

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saw that the other
routers are configured

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as the DR and the BDR
here on this multi access

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segment in area 0.

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Of course, we can also
look at our neighbors.

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We already saw those come
up, but there they are.

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And they're all exactly
as we would expect.

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And we can also
look at route, which

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is how we see that OSPF RIB.

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So again, this
matches up with what

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would be in the routing table.

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So router six looks like
it's configured properly.

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As one final step, let's
go ahead and configure

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redistribution into OSPF V3.

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For this we're actually
going to go to router 10.

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It has a loopback
interface on it

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that's not running
OSPF version three,

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and we can redistribute
that into OSPF.

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So if we do a show IPv6
interface brief here

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on router 10, we have
this loopback 100

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that has an address of 2001
DB8 colon 100 colon colon 1.

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Let's go ahead and redistribute
that into OSPF version three.

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So to do this of
course, we simply

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go into the routing process.

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We'll go into our
address family for IPv6.

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We'll do a redistribute.

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This is going to be connected.

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And if we hit the
question mark here,

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we'll notice that this has the
exact same features that we

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have when we redistribute
into OSPF version two.

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So for example, we could tag
these routes with, let's say,

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a 100.

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We can look at our database.

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00:11:24,890 --> 00:11:27,920

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And we can see that we're
now generating this type five

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LSA into OSPF version three.

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We see that it's very similar
to one in OSPF version two.

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Our advertising router is
still our 32-bit router ID.

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We still have things like our
sequence numbers and such.

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And then we have the actual
prefix that's being advertised.

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The 2001 colon DB8 colon
100 colon-- colon /64.

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We see that it has a metric type
of two as OSPF does by default.

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And it also has a
default metric of 20,

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just like OSPF version two.

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Also note that it brought
along our route tag

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that we put on it of 100.

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Just to verify, let's go look
at this on another router

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outside of router 10.

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We'll say, pick on router seven.

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And there's two things we can
look at in the database now.

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The first would be we
now have a type four LSA

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because now we have an ASBR.

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So we'll do inter-area and we
see that router six, the ABR

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is advertising the router
ID of the ASPR router 10.

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So we can see that this is
working exactly the same

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as a type four LSA operates
in OSPF version two.

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Also just to make sure we
have it, let's go ahead

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and check for the external,
which of course, we have.

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So we have that prefix
now coming from router 10.

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And finally, we can look
at the routing table,

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and we see the external
type two showing up here

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with our tag of 100.

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So our redistribution is
working exactly as it should.

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And we can also see that
it's exactly the same as OSPF

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version two.

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In this video, we jumped
into the command line

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and we got OSPF version
three configured

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both on IOS XR and IOS XE.

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Those are, of
course, substantially

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different configurations
but at the end of the day

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they're also a
little bit similar

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that we're putting the
same basic commands

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on both operating systems.

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It's just the formatting
is a little bit

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different between
the two platforms.

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Remember that on IOS XR
all of the configuration

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goes under the OSPF process.

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And in IOS XE some of it
goes under the global process

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such as router ID and
passive interfaces.

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But actually enabling the
process on the interfaces,

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well that happens on the
interfaces themselves.

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We also wrapped up
there by taking a look

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at some redistribution and saw
that it works exactly the same

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as OSPF version two.

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I hope this has been
informative for you.

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And I'd like to thank
you for viewing.

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