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[AUDIO LOGO]

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So for our first
configuration, let's

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jump in and configure
redistribution

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from our other
protocols into IS-IS.

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Now, we are going to be using
a new topology for this skill.

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So let's start by introducing
that topology, talk

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about what redistribution
we're going to do.

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

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and make it happen.

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So let's start by taking
a look at that topology.

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So in this skill, we're going
to be using IGP topology 2.

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And as we can see, this involves
several different routing

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protocols.

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Up here between router 6
and router 10, we have RIP.

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Then for this whole section
down here at the bottom left,

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we have IS-IS.

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And it's all running
a single area.

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It's all running area 10.

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On the top right between routers
1, 2, and 9, we have EIGRP 100.

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And then between 1,
2, 4 and 5 is OSPF.

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And like IS-IS, this is
running a single area.

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In this case, area 0.

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In this video, what
we're going to be doing

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is configuring
redistribution into IS-IS.

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Specifically, we're
going to redistribute RIP

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into IS-IS on router 6.

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And then we're going
to redistribute OSPF

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into IS-IS on router
1 and on router 3.

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So that's what we're going
to configure to get started

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as we jump into redistribution.

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So let's go ahead and jump
into the command line.

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So let's begin here on router 6.

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We'll start with just
a show ip route just

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to verify its routing table.

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And specifically,
what we're looking

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for is the fact that it
has a few RIP routes here.

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So we can clear this up a
little bit by saying RIP.

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And we can see that we do have
three RIP routes that we've

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learned so far on router 6.

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Let's also verify that these
routes are not on router 7.

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So just to focus on one
root, let's look at this

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204.186.19.0/26.

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And let's go over and verify
that it's not on router 7.

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So we'll look specifically
for that prefix.

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And we see that the network
is not in the table.

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So currently, the RIP routes are
not in the IS-IS environment.

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So now, let's go ahead and
configure our redistribution.

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So back on router 6, we'll
go into our IS-IS process.

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And we'll start with a
very simple redistribution.

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We'll simply say to
redistribute RIP.

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We'll go ahead and end
that configuration.

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And now, let's verify.

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So let's go back over to router
7 and see if this has worked.

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We'll simply repeat
the last command.

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And notice that the network
is still not in the table.

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Now, this is one of
our caveats with IS-IS.

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The default is to redistribute
routes into level 2 in IS-IS.

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However, all of our devices
are running IS-IS level 1

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since it's just a single area.

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So what we're
going to have to do

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is we're going to have to
modify our redistribution

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to send the routes into level
1 instead of into level 2.

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To do this, we simply go
back into configuration mode.

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And we can pretty
much just repeat

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all of our last commands.

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But instead of just
saying redistribute RIP,

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notice that we
have an option here

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to specify which level the
routes are going to go into.

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Now, we could say
level 1 and level 2.

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But again, we have no level 2
in this particular topology.

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So we'll simply say level 1.

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Lay the configuration again.

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And now, let's see
if it's worked.

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So back on router 7,
notice that now, we

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have the entry from IS-IS.

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There are a few things,
however, about this prefix

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we want to take note of.

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First is that it's an
ISIS level 1 route.

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Of course that's what we
told it to bring it in as.

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But IS-IS doesn't
really have a mechanism

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for keeping track of the fact
that this was an external route

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being redistributed.

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The second thing is
notice the metric

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on this route, where the
cost is a cost of 10.

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That's of course, the cost
between the two routers.

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That means that the route
is coming in as a 0,

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which we had indicated before.

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That is what the seed
metric is in IS-IS.

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However, there is a
choice to actually

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have it copy the metric out
of the routing table when

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it does the redistribution.

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Let's go ahead and configure
that and see what changes.

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So once again, we'll
go into configuration.

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We're going to router IS-IS.

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And on the redistribution
line, we can add metric type.

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And then we have a
couple of choices here.

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The one we're looking for is
to say rib-metric-as-external.

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And that will cause
it to put the rib

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metric from the routing
table onto the route.

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Once again, we'll
exit configuration.

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And let's go back to
router 7 to see our change.

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So we'll repeat
this command again.

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It's only a difference of
one because it was only

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one RIP hop away on router 6.

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But notice that
our cost is now 11.

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So it's taking the
cost from the rib.

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In the case of RIP, of course,
that being a hard count,

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and bringing it in to IS-IS.

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Now, we hadn't really
mentioned this previously.

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But why don't we go ahead
and bring a connected route

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into IS-IS as well?

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If we do a show ip route
isis here on router 7,

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I can't highlight
what's not here.

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But we're going to bring
in an 88.88.88.0, which

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is big surprise,
coming from router 8.

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So let's hop over to
router 8 real quick.

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We'll start with the
show ip interface brief.

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And we see here that we
have this loopback 88

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with that network I just
mentioned configured on it.

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Let's bring this into
IS-IS as well just

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so we can see how it works.

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So we'll go into
configuration mode.

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Again, into the IS-IS process.

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We'll say redistribute
connected.

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And again, we'll specify
level 1 because that's

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all we have in our environment.

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Exit configuration, and
let's go back to router 7.

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On router 7, we'll just do
the show ip route isis again.

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And notice at this time,
we do have that 88.88.88.0

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coming from router 8.

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And again, it just looks like
a typical IS-IS level 1 prefix.

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If we look at more
detail on this,

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we could say show isis ip rib.

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And look at that
particular prefix.

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We see that it's
in our topology.

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We see the majornet
being 88.0.0.0/8,

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which is essentially the fact
that it's a class A network.

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Then of course, we
see the prefix itself.

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And we see it's next
hop, who we learned it

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from, any tags,
things like this.

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But again, no real
indication that

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is from an external source.

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We could also look at a show
isis database, specifically

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the l1 database.

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And we can ask for detail for
IP entries coming from R8.00-00,

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which is router 8's IS-IS ident.

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And again, notice even in the
detail of the database output,

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there's really no
indication that this

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is from an external source.

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So just keep that in mind
as a caveat in IS-IS.

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Next, let's go ahead and
configure the redistribution

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from OSPF into IS-IS.

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For that, we'll jump
over to router 1.

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We'll go into configuration
mode for IS-IS.

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Under the address
family IPv4 unicast,

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we'll say redistribute
ospf process 1.

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And again, we'll bring them
into the level 1 database.

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We'll commit those changes.

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Exit configuration.

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And one thing we could do to
make sure that it's working,

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we could do the
show isis database.

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And we'll just look
at our own database.

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So XR1.00-00 and do detail.

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Essentially,
looking at this, all

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of these entries
with a metric of 0

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are either local to this router
or are being redistributed.

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So this is bringing the
information into IS-IS.

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So if we jump over to
router 7, repeat looking

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at the IS-IS routing
table, we'll notice first,

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it's a lot larger.

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And we're getting entries
from the OSPF environment.

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Just for a route to focus on,
notice we have the 10.2.2.2/32

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entry, which is
router 2's loopback.

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Router 2, of course, is
in the OSPF environment.

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So this is a route
being redistributed.

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Let's configure
router 3 the same way.

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Go ahead and commit
those changes.

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And we'll verify the
database here as well.

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So as we can see by these
entries with metric 0

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on this router, it's also
doing the redistribution.

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Let's see if that's changed
anything on router 7.

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If we look at the routes
again on router 7,

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we'll notice that for several
of these, such as our 10.2.2.2

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address, we are actually now
multipathing through router 1

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and router 3.

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Now, at this point, we could
do a connectivity test.

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But it's most likely not
going to work because what

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have we configured so far.

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We have configured one-way
redistribution of routes

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being sent into IS-IS.

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So let's hop over under router
8 and just do a ping test.

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We're expecting it
to fail, but just

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to see how we don't
actually have reachability

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because the other routing
domains have no idea how to get

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back to the IS-IS domain yet.

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So again, just real
quickly here on router 8,

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we'll do a ping
204.186.19.202, which

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is an address up on router 10.

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And of course, it fails.

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Just to show you real
quickly that this

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is an address on
router 10, notice

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that it's right here on
the loopback 204 interface.

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It has that address
204.186.19.202.

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because we hadn't looked
at that previously.

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In this video, we saw how to
redistribute routes into IS-IS.

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We saw how it brings them in
with a default metric of 0.

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We also saw how we can have it
copy the metric from the rib

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if we choose to.

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So next, it would be a good
idea to configure redistribution

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into OSPF.

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And that's exactly what
we're going to do next.

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Until then, 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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