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[MUSIC PLAYING]

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The first thing that
we want to configure

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when setting up segment-routing
traffic engineering

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is to configure MPLS in
the core to support traffic

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engineering as
well, because again,

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remember that MPLS is the data
plane for segment routing.

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So what we're going
to do in this video

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is configure MPLS
traffic engineering

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on all of our devices
and then configure

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the core IGPs to also support
MPLS traffic engineering.

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So let's go ahead and
bring up our topology.

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This is going to be a
different topology than we've

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used so far, because
we're going to do

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all of this in a multi-domain
environment being linked

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together through
a BGP controller.

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So let's take a
look at that diagram

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and see where we're going
to be enabling MPLS traffic

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engineering so we can get ready
for our segment-routing traffic

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engineering tunnels and
policies to be implemented.

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So for this skill, we're going
to be using MPLS topology 5.

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Now, as we go into this,
the physical connections

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between all of the
devices are the same.

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We're just sort of modifying how
they are logically connected.

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So as you can see,
we're going to be using

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two different domains here.

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We have domain 1, which is
going to be running ISIS,

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and we have domain 2,
which is running OSPF.

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Now, the IGPs are
already configured.

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Also keep in mind
that routers 3 and 4,

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although they are
part of both domains,

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they are not doing
any redistribution.

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So as of right now,
domain 1 and domain 2

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are completely separate.

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So what we're going to be
doing in this demonstration

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is we're going to be configuring
traffic engineering for MPLS,

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both on the devices
and in the IGPs.

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So that said, let's
go ahead and get

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started, and since we have to
configure all of these devices,

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we'll just go ahead
and start on router 1.

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So we're going to start
by enabling MPLS traffic

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engineering, but keep in mind
that, much like we didn't use

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LDP when doing, we'll call it
normal segment routing, when

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we're doing segment-routing
traffic engineering,

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we also don't use RSVP like
we did for traditional MPLS

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traffic engineering.

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So notice as we're
going to go through here

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and configure all of
this that we're not

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going to be configuring
RSVP in our environment.

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So again, just keep
that in mind as we

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go through this configuration.

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So what we do have to configure
is MPLS traffic engineering,

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then we have to enable
it on our interfaces.

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So this is going to be all
the interfaces on router 1.

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Commit those changes,
exit configuration,

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and let's do a show
MPLS interface.

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We see here that all
of those interfaces

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are now enabled for tunneling.

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So router 1 looks good.

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Let's just go ahead and move
right along to router 2.

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Keep in mind that if we
do our show MPLS interface

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too quickly after
configuring, it may not quite

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be prepared yet.

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So if that's the case,
just wait a few seconds,

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do the command again,
and we see here

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that now the interfaces
are showing up,

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and they are enabled
for tunneling.

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So routers 3 and
4 are, of course,

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going to be very similar
to routers 1 and 2,

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since they're iOS XR.

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Let's just go ahead and
paste the configuration

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on those two routers.

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So that should take care
of the configuration,

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but we do still want
to verify as we go.

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So we'll do our
show MPLS interface.

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So all of these
interfaces are good.

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Let's go to router 4.

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So that takes care of router 4.

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And once again,
show MPLS interface,

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and these interfaces
are correct as well.

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Now, let's go over to
iOS XE on router 5.

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So the configuration on router
5 is simply going to be we

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have to do MPLS traffic
engineering tunnels

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under global configuration.

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Then we go into each interface.

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So in this case, it's
interface gigabit 1,

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and we literally just
put the same command

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under each interface.

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So this is going to be gigabit
1, gigabit 2, gigabit 3,

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and gigabit 4.

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We'll go ahead and
exit configuration.

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And again, show MPLS interface.

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So here, we see those interfaces
are up and ready to do tunnels.

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Let's go ahead to router 6.

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So one more time.

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It's MPLS traffic
engineering tunnels,

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then we go into the interfaces,
and it's the same command.

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So that's gig 2, 3, and 4.

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Here on router 6,
just like router 5.

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Now, we still have to
configure routers 7 and 8.

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Just like 5 and
6, they're iOS XE.

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So the interfaces are
a little different,

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but we'll just go ahead
and paste the configuration

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onto those routers.

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So there's router 7.

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We'll do our show
MPLS interface,

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and we see that its
two interfaces are

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ready for tunnels and router 8.

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So that takes care of
router 8, and its interfaces

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are operational as well.

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So now our next
step is going to be

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to configure our core IGPs
to support MPLS traffic

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engineering tunnels.

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So once again, let's
just hop back over

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to router 1, start there, and
go through these in order.

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So router 1 is in
the ISIS domain.

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So it's router ISIS 1.

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We go into our address
family for IPv4 unicast.

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We go into MPLS
traffic engineering,

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and these are all
running level 2,

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so we'll just do level 2 only.

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Let's also configure
a router ID.

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We'll just assign
that to loopback 0.

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Commit the changes,
and exit configuration.

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So now let's do a show ISIS,
MPLS, traffic engineering,

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advertisements.

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So we can just look at
this one entry here,

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and the important
thing to note is

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look how this is carrying
the exact same information

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that RSVP would carry.

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Yes, we have our system ID,
our interface IP address,

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and our neighbor's IP address.

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But more importantly, look
at this traffic engineering

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information right here.

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We have the TE metric,
which is defaulting to 10.

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We have our physical bandwidth,
our reservable bandwidth,

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and our reservable sub.

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So we can see here that
there's no reservations yet.

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Everything is, of
course, wide open.

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There are 0 kilobits
per second reserved.

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We can see that all
of the bandwidth

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is unreserved at this point, but
again the most important thing

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to note here is how
this is carrying

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the exact same
information as RSVP would.

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This is the replacement
control plane for RSVP.

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So let's go ahead and
configure router 2.

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This is also running ISIS.

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So we'll put in the
same configuration,

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commit the changes, exit, and
verify our advertisements.

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So once again, we
see here router

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2 advertising, essentially
the same information

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as router 1 was,
but the point is,

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again, this is replacing RSVP.

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So now, let's go
over to router 3.

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Now, router 3 we're going
to partially copy and paste,

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because we've seen the ISIS
configuration a few times now.

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This is the same
as routers 1 and 2.

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But router 3 is also
running router OSPF 1.

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So we have to
enable it here too.

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This command is MPLS
traffic engineering,

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and let's start with our
router ID here of loopback 0,

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then we go into area 0 and
actually enable MPLS traffic

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engineering here.

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Now, we can commit
all of those changes,

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exit configuration, and let's
do a verification of ISIS again.

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So we see here that
router 3 is properly

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advertising its information.

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But let's also look at show OSPF
MPLS traffic engineering link.

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Here, we can see that
this same information

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is being sent into OSPF.

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So again, we see the link
ID, the interface, neighbors,

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and addresses, and then we
go into the admin metrics.

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Now, in this case, the
TE metric is actually 1,

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then we see the
maximum bandwidth,

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the maximum global
pool reservable

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bandwidth, the current
priority, and of course,

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the current unreserved
bandwidth, and so on.

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But again, all of the
RSVP information being

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carried in OSPF.

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Now, router 4 is going to
have the same configuration

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as router 3, so again, we
can paste that configuration

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in on router 4.

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So there's router
4's configuration.

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We'll verify our
show commands there's

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our ISIS advertisement and OSPF.

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So that takes care of our iOS
XR configuration for both ISIS

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and OSPF.

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So of course, now we have
to move on to iOS XE.

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We'll go ahead and
start on router 5.

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So router 5 is also
part of the OSPF domain.

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We turn on MPLS,
traffic engineering.

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We'll again set the router
ID to loopback 0, enable it

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for area 0.

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For verification, let's do
a show IP OSPF, MPLS traffic

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engineering link.

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So here, we're seeing
the entries for router 5,

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and we see that it's putting
the information into OSPF,

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as it should be.

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So now, let's configure
the rest of our routers.

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Router 6 is also part of OSPF,
so let's go ahead and just

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paste that configuration
in since it's

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the same as router 5.

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So that takes care of
router 6's configuration.

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Router 7 is going
to be a little bit

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different because it's in ISIS,
so let's go over to router 7.

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So here, we simply go into
the router ISIS 1 process,

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and it's almost
the same commands.

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It's MPLS traffic engineering.

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We'll again set the
router ID to loopback 0,

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and instead of assigning it to
an area like we did with OSPF,

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what we do here is we
tell it what level to use.

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Again, these are all level
2 devices in this topology.

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So we'll simply say level
2, exit configuration,

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and let's verify.

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So show ISIS, MPLS, traffic
engineering, advertisements.

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And we see it's advertising
its information into ISIS,

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as it should.

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So this is working properly.

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Finally, we have router 8.

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Router 8 is also
running OSPF, so this

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is going to be the
same configuration

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as the other routers
running OSPF and iOS XE.

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We'll just paste that
configuration in.

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And that takes care of
router 8's configuration.

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We'll verify this
last router, so show

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IP OSPF, MPLS traffic
engineering link.

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And we see it's advertising
its information as it should.

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So now, our IPs are
properly configured

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for traffic engineering.

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So in this video, we saw
how to enable MPLS traffic

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engineering, both on our devices
and interfaces and in our IGPs,

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including ISIS and OSPF.

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Of course, we also looked at
this on both iOS XE and iOS XR.

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The big takeaway here
is we don't use RSVP.

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All of the information
that was normally

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carried in RSVP for
traffic engineering

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is now carried in our
RGPs just like they were

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updated for segment routing.

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Well, they were
updated for segment

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routing traffic
engineering as well,

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so this takes care
of both sides.

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So now that that's
configured our next step

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is going to be to set up actual
segment routing in our core

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since that's not yet configured.

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But that's what we're
going to do next.

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But 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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