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[AUDIO LOGO]

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So the first thing we want
to do before we actually

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start implementing
IS-IS is we want

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to plan out what we're
going to actually do.

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Now, this is true of
most things that we

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want to deploy on our network.

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So this is, of course,
certainly not unique to IS-IS.

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However, IS-IS does
have a few things

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that we want to think about as
we're getting ready to roll it

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out and deploy it, and that's
what we're going to try

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and focus on in this video.

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So let's jump in
and just take a look

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at a few of the
fundamental things

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we want to make sure
we have planned out,

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and then we'll jump over
to our topology diagram

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and take a look at
what we're going to be

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building throughout this skill.

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So again, let's start off with
some of those basic things

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that we want to make
sure we have in place.

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So we do have a few
basic steps that we

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want to plan when we're
doing our IS-IS deployment.

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The first here is to plan
our area and IP designs.

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Now, the main point
we're looking for

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is that our area
and our IP design

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really has to follow each other.

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Because, remember, we can only
summarize at area boundaries

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in IS-IS, much like OSPF.

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So that means that
where we can summarize

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has to follow what
we can summarize.

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If we can't summarize
properly at our area edges,

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then it's not going
to be a very good fit.

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Now, something else to keep in
mind about the area numbering

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here.

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We have to make a decision.

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If we want to use real
or readable area numbers.

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And simply what we mean by
that is let's say, for example,

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we wanted area 10.

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Well, we could do
that as area 10

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or since this is
technically hexadecimal,

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we could make this
area A. So we really

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have to decide which
one we want to do.

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Technically, area 10
should be A. However,

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it's probably a little more
readable and understandable

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for people if you
say area 10 for it

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to actually show up
as a 10 when we're

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looking at things like our
database and things like this.

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So generally
speaking, I personally

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prefer to go with
the readable design.

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So if I want area 10,
I'm going to make it

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a 10, rather than the
technical A. That's

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what 10 really would be in hex.

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But again, it's just
a personal preference,

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and you can do whatever
works in your environment.

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The next thing we have to
do is design the backbone.

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Keep in mind that
the backbone is

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all of our level 2 connectivity,
and it must be contiguous.

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There has to be complete
level 2 connectivity

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through the entire environment.

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We also have to come
up with some sort

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of a net addressing scheme.

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Again, the recommendation
is to make these unique

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through the entire environment.

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Although, technically, you
could do the same net number

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in different areas.

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It's really not recommended.

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And then we want to plan where
we want our passive interfaces.

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In a future skill,
we're going to talk

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about some more
advanced IS-IS features,

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and one of those things is
called prefix suppression.

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And not to give all the
secrets away right up front,

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but prefix suppression
and passive interfaces

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sort of go hand in hand.

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So we want to make
sure that we actually

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set up our passive interfaces
correctly from the beginning

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so that if we do
want to use something

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like prefix suppression
in our design, well,

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it'll actually work
properly because we set up

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our passive interfaces
correctly to begin with.

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So these are some
things we probably

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want to keep in mind before
we start our IS-IS deployment.

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But during the deployment,
we have a couple

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of steps we need to follow as
part of the deployment as well.

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The first step here
is just to complete

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the planning steps,
which is just

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everything we just did up here.

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So we, again, need to plan
out the deployment with things

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before we start.

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But when it comes to the actual
deployment on the devices

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themselves, the next
thing we have to do

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is enable IS-IS on the router.

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Then we have to
configure that net number

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that we designed as part
of our deployment strategy.

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We have to enable IS-IS on
the appropriate interfaces

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and, again, if required,
set them to passive

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if that's what we need to do.

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Then we need to configure the
appropriate router level, link

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level, and network type.

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So again, for the level
and the link level

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here, again, we would
be talking about

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whether this is going to
be an L1 or an L2 or both.

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And for the network
type, of course,

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this is either going to
be LAN or point-to-point.

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So we need to configure
the router appropriately

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for the level, the link
level, and the network type.

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So now let's jump
in and take a look

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at the topology of what we're
actually going to build.

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So for this skill, we will
be using IS-IS topology 1.

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And some things to look at here.

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First, we can see that we have
a bunch of different areas.

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So we have area of 100 here,
which is sort of our core area.

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We have area 10 over here
on the right, which also

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includes quite a few routers.

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And then we just have a
few single router areas.

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We have an area 20 down
here and an area 30 up here.

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We can also see all the
different interfaces here

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that are going to be
involved in this discussion.

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Now, we may not deploy our level
1, level 2 exactly like this.

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However, at a bare
minimum, we're

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going to have to have
level 2 going from router 9

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to router 2, from router 2
to router 1, from router 1

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to router 7, from
router 7 to router 8.

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That's the bare minimum
that we're going

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to have to have our level 2.

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Now, realistically,
we will actually

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build in some redundancy
and things like that.

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So we'll actually be
implementing level 2

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on more than just these links.

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But from a bare
minimum perspective,

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this is what we
would have to have.

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Also, you want to make sure that
we know what type of networks

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we want to run.

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So for example, most of these
links can be point-to-point.

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We can look at that
as our default.

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They're not going
to default to that;

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we're going to
have to change it.

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But we can use
point-to-point as the default

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because we only have two
multi-access segments.

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One of them is the
link right here

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between router 1,
router 6, and router 7.

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This is a multi-access
segment, so this

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will have to be a LAN segment.

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Also, over here, between
routers 2, 4, and 5,

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this is also a LAN segment.

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Now, on this side,
the underlying switch

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is not actually shown
because it's not really

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a relevant part of the topology.

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However, there is a switch
underneath this connection

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here if you want to
draw it in there.

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It's just not shown on
the logical diagram here.

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So this is a
multi-access network,

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so we'll deal with that as we
go through our configuration.

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So, again, most
of our connections

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here can be
point-to-point, but we

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do have these two
segments that are

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going to have to be broadcast,
or LAN, network type.

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So in this video, we
jumped in and just took

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a look at some of the things we
need to think about and design

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as we're getting ready to
roll out our IS-IS deployment,

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as well as the steps
that we have to take

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to actually do the deployment.

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Then we took a
look at what we're

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going to be building throughout
the rest of this skill

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as we go through
the upcoming videos.

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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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