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[AUDIO LOGO]

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So now that we have IS-IS
up and running in Area 100

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acting our backbone area
because we configured everything

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as level-2, well, now, let's go
ahead and configure Area 100.

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Now, we are going to configure
Area 100 just a little

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bit differently.

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So let's go ahead and
bring up the topology,

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take a look at it,
and talk about what

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we're going to configure
just a little differently.

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And then, of course, we're going
to jump into the command line

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and get IS-IS up and running.

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So let's take a look
at that topology.

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So again.

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In this video, we're
going to be configuring

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Area 10, which means we're just
going to be configuring three

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routers.

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We're going to configure
router-2, router-4,

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and of course, router-5.

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Now, what's going
to be a little bit

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different about this
configuration is

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although this multi-access
network here will, of course,

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still be a LAN network,
what's going to change

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is we're going to
configure this as level-1.

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We don't need level-2 here
because this isn't necessarily

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part of the backbone.

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Now, we will have to configure
router-2 as a level-1/level-2

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because it's going to need to
have level-2 like this in order

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to ultimately connect
in our Area 30 up here.

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So router-2, at least for
now, will be level-1, level-2,

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but this LAN segment here
between R2, R4, and R5,

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we're going to start off
configuring it, as we said,

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just as level-1.

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So with all of this
in mind, let's jump

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into the command line.

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We'll go ahead and
start on router-2.

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So this will be much
the same configuration

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we've already looked at.

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So again, we just turn on IS-IS.

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We'll set our network number.

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Again, it's going to be 49.

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Now, this is going
to be Area 10.

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So this is going to be 0010 now.

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And then, of course, we'll
set this up to be system-ID-2.

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So that takes care
of our net number.

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We go into our address
family once again.

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Set our router-ID,
configure our metric-style,

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going to our loopback interface,
turn on our address family,

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and then we'll start
with our gigabits.

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So we'll start
with gigabit-0000.

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This one is going to be level-2
because this is the interface

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going over towards router-1.

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It's also point-to-point.

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And we'll enable
our address family.

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Gig-1, this one is going
to be circuit-type level-1.

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This is that
multi-access segment,

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that also means it doesn't
get point-to-point.

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So now, all we have to do is
enable the address family.

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Gigabit-2, this is
going up to router-9.

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This is also going to
be level-2 because it's

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going into a different
area, also, point-to-point.

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And we enable the
address family.

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Commit the changes.

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Let's exit configuration.

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And let's do some verification.

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Let's do a show IS-IS protocol.

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The main thing to look at
here is the default level.

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Notice that this is a
level-1, 2 router because that

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is the default. And
that's good because,

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again, that's what we
need router-2 to be.

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It's going to be level-1 down
towards router-5 and router-4,

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but it's level-2 going
over towards router-1

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and up towards router-9.

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Let's also verify that our
neighborships have come up.

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At this point, we're only
expecting a neighborship

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to router-1, which we do have.

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We see, of course, that it's out
our gigabit-0000 interface that

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is point-to-point and that
it is a level-2 connection.

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So, so far, this
is looking good.

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We can also verify that
we have some routes.

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We should, at this point,
have all of the routes

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from Area 100, and we
can see here that we do.

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Once again, at this point,
they're all level-2,

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and that's OK.

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That's what we should
have at this point.

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So, so far, router-2
is looking good.

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Let's go ahead and jump
over and configure router-4.

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Once again, almost the
same configuration here.

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Again, the net number is going
to be different, but other

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than that, it's
pretty much the same.

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Set our router-ID, metric-style.

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We'll enable our address
family under our loopback.

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We'll set the circuit-type
on gigabit-0000 to be level-2

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since, again, that goes over
towards router-3, also makes it

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point-to-point.

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And we'll enable
our address family.

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Interface gigabit-0001,
this is going

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to be a circuit-type
level-1 because again, this

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is that multi-access network.

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That also means it does not
get set to point-to-point.

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And all we have to do is
activate our address family.

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Commit our changes
and exit config.

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So once again, let's
do some verification.

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We'll do our show
IS-IS protocol.

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And again, this is
a level-1-2 router.

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That's what it needs to be
because again, it's connected

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at level-2 over to router-3.

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And we can come
down here and see

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that we are, in fact, running
it on the correct interfaces.

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We do a show IP route
for IS-IS routes.

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We can see here that we
have mostly level-2 routes.

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But notice, we do
have, at this point,

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at least one level-1 route.

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This is the route coming
from router-2's loopback.

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Because at the moment, if
we do a show ISS neighbor,

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we can see that our
neighborship to router-2

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is actually a level-1.

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So that explains why we're
getting a level-1 route

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on the connection from router-2.

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And again, this is
exactly what we intended.

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We can also see this
in the database.

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If we do a show
IS-IS database, this

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means we're now going
to have two databases.

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Here, we have a
level-1 database.

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And here, we have
our level-2 database.

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So finally, let's go
configure router-5.

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Again, this is IOS XE.

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So it's going to be just a
little bit different but mostly

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the same.

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Again, we go into
our IS-IS process.

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We'll set our network number.

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This one will go ahead and set
the is-type because router-5

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only has to run level-1.

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We'll set our router-ID.

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We'll set our metric-style.

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And then we'll go
to our interfaces.

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We can see our neighborships
have already come up,

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but we'll just go ahead and
hard-code the circuit-type

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anyway just so we know
that it's level-1.

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Exit out of configuration.

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And let's do some verification.

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Once again, we'll do
a show IS-IS neighbor

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even though as
we've already seen,

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router-2 and router-4
already came up.

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So we see that those are good.

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We can also tell based on
the circuit-ID that router-5

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is on DIS on this circuit if
we do a show IS-IS database,

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notice that we're only
seeing a level-1 database

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since we configure this
router to only be level-1.

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And if we do a show IP route
IS-IS, notice how few out

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we have.

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This is because we're looking
at the default behavior

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where when a
level-2 router sends

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the routes into a level-1
area or adjacency,

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it generates this default route.

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This default route
is used instead

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of all the routes from level-2.

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This is part of what
IS-IS does automatically

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to help reduce the size
of the routing table.

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So we see that we have the two
level-1 entries and that one

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default, of course,
being generated

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by both router-2 and router-4.

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Just for final
verification, let's go

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check on a router
outside of Area 10

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let's hop over to router-7.

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So here, let's do a
show IS-IS database.

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Remember, this is going to
be only a level-2 database

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since this is in Area 100,
which is our backbone.

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If we do a show IS-IS rib,
let's look particularly

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at router 5's loopback.

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We'll say, 10.5.5.5.

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And what we're looking
for here is the fact

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that the R flag is set.

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We talked about flags
previously in another video,

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and we said that the
R flag is used if this

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is leaked between areas.

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And we can see here that
that's what this has done.

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It's been leaked from
level-1 to level-2.

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If we look at that route,
we see that we actually

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have two paths to get to.

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It one of them is
through router-3.

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The other one is
through router-1,

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which means that if we were
to trace to that destination,

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we'll source it
from our loopback,

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we can see that it's
actually doing load-sharing

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through the
environment, which is

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exactly what we would expect.

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So we see here that we have
IS-IS up and running in Area 10

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exactly as we designed it.

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In this video, we
took a look at how

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to set up our second
area where we did things

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just a little bit differently by
having some level-1 adjacencies

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on our LAN segment.

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Then we verified
how the databases

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are configured to
have just level-1

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on the level-1-only
router, router-5.

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But how we had both databases
on our level-1/level-2 routers,

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that would be routers 2 and 4.

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Then we of course wrapped
up by doing a traffic test

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and verifying that we actually
have load-sharing going

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on through our network even into
the other area where it only

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has some level-1 adjacencies.

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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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