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[AUDIO LOGO]

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So, so far, we have enabled
MPLS traffic engineering

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on our core interfaces.

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We've enabled RSVP on
those same interfaces

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and configured what we want
to reserve for bandwidth,

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both total and per flow.

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So our next step is
going to be to configure

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the IGP to actually
support MPLS TE extensions.

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So let's go ahead and jump in.

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We'll take a look real quickly,
of course, at our topology just

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to remember which routers
we're working with here.

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And then we'll jump
into the command line

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and get this operational.

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So once again, we are
still on MPLS topology 1.

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Now for this video,
we're going to have

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to focus on something
a little bit different

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since we're talking
about the IGP.

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So in this environment, we
are actually running OSPF.

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And specifically since we
usually configure this by area,

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we're going to have to be aware
that our underlying IGP is OSPF

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and everything is in area 0.

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So again, we'll be configuring
all of our routers.

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So we have to configure router
1, router 2, router 3, router

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4, and router 5 for OSPF to
support traffic engineering

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extensions.

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Now we actually don't have
any IS-IS in this environment

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right now.

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But at the end, we will bring up
a slide with the configuration

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that we would use for IS-IS.

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So we'll see that
configuration as well.

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But we'll actually
be configuring OSPF.

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So that said, let's go ahead and
jump over to the command line,

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

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So let's start simply by
going into configuration mode,

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into our router OSPF
process, and then we

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simply say mpls
traffic engineering

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and configure our
router ID to loopback 0.

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This can technically be
different from the normal OSPF

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router ID.

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But generally, you would
want to make it the same.

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Then as we mentioned,
we're going

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to configure this per area.

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So we'll go into
area 0 and simply

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turn on mpls
traffic-engineering.

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We'll commit the changes,
exit configuration mode.

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And we can verify
this with a show ospf

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mpls traffic-engineering link.

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And what do we see here?

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We see that area 0
has two MPLS TE links.

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Those are, of course,
the two interfaces

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that we have
enabled in the area,

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as well as being traffic
engineering enabled.

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We can see that it gives
us the interface address.

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We see the admin metric
for TE is set to 1.

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And, of course, various
other information

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here, such as the affinity
bit is currently set to zero.

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So lots of information that we
can get out of this command.

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Let's go ahead and
configure router 2.

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This is going to be essentially
the same configuration.

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So go ahead and put in
all that configuration.

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And again, we'll verify it.

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Once again, we see that we have
two MPLS TE links in area 0.

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So that brought in both
of our interfaces here.

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Next, let's do router 3.

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Now we see here on router
3 that this of course,

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includes four links because
it has four interfaces.

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And let's wrap up our
IOS XR with router 4.

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Again this configuration
is almost identical.

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So we'll just go ahead and
paste this configuration.

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And then we'll verify it.

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And again, just like
router 3, router 4

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has four MPLS TE links.

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So, so far, this
is looking good.

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Now let's configure
IOS XE on router 5.

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So once again, of
course, configuration

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mode, router ospf 1.

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Here it's going to
be mpls traffic-eng.

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And again, we'll set
it to loopback 0.

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We essentially repeat
the same command,

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but enable it for
the area as well.

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So again, slightly
different configuration here

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on IOS XE, but the
same basic process.

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We're setting the router ID and
enabling traffic engineering

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for the area.

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Let's go ahead and
exit out of this

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and verify the
links here as well.

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So we'll say show ip ospf
mpls traffic engineering link.

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And here, of course, we see that
we have those two links enabled

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for MPLS TE.

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Now that we have
this configured,

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why don't we take
a look at Wireshark

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and look at a packet capture
of these OSPF packets

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exchanging the traffic
engineering information?

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So what we've captured
here on Wireshark

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is the actual OSPF
neighborship coming up

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between router 1 and router 3.

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We're filtering this by OSPF.

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And what we're
going to do is we're

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going to focus on packet
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to the OSPF multicast address.

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If we look at our
decoding window,

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we can see that under
open shortest Path first,

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this is an LSA update packet.

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And we see that it's LSA
type 10, it's an opaque LSA.

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Let's open that and
see more detail.

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So what we're looking
for here specifically

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is it's a link state ID opaque
type traffic engineering LSA.

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We can also see down
here at the bottom

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that the MPLS traffic
engineering LSA

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has more of a breakdown to it.

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We can open that up.

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And what we see here is all
of this information related

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to traffic engineering,
including things

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like the interface IP address.

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Once again, we see that
traffic engineering metric.

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We see the maximum
bandwidth available,

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the maximum reservable
bandwidth available.

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So, of course, the
maximum bandwidth

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is the interface itself.

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And then, of course, the maximum
reservable bandwidth we can see

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is that two megs that we
configured on our devices.

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So we can see all of
this information being

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exchanged in OSPF LSAs between
our MPLS TE enabled neighbors.

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So let's go ahead and jump
back over to the command line.

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So that's really all there is
to configuring MPLS TE support

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under OSPF as our IGP.

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Now as I mentioned
earlier, since we

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don't have IS-IS running in
this particular environment,

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let's go ahead and at least
look at the commands that

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would be needed to enable IS-IS
if that were our core protocol.

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So first, let's take a look
at our IOS XR configuration.

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So, of course, just like
before the first thing we do

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is go into our IS-IS process.

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We configure our net number if
this is not already configured

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on our device.

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This is required in order
to do traffic engineering.

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So if it's not
configured, we are

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going to have to configure it.

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Then, of course, we go
into our address family,

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either IPv4 four
or IPv6, we're just

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showing the IPv4 example here.

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And three things we
really need to do.

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First, we need to turn
on metrics style wide.

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This is needed in order to
support traffic engineering.

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It's needed to support IPv6.

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It's actually needed
for a lot of things.

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So really you want metrics style
wide on with IS-IS in, well,

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every scenario that
I can think of.

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But generally speaking,
you just want to enable it.

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The other two
things we have to do

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is turn on traffic engineering
for whatever level database

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it is that we want to support
traffic engineering in.

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This can, of course, be
either level 1, level 2,

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or as we're doing here,
level 1, 2 to cover both.

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And just like before
in OSPF, we really

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want to set the
router ID as well.

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Of course, in this example,
I'm just using loopback 0.

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But of course, you could use
whatever interface you prefer.

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Now if we look at our
IOS XE configuration,

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we'll see that this
is almost identical.

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So the first thing is we go
into the router IS-IS process,

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and then we can simply just turn
on MPLS traffic engineering.

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And again turn it on for
whatever level database

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it is we want to support.

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We, of course, once
again set our router ID.

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In this example, I'm again
setting it to loopback 0

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just like we did on IOS XR.

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And just like IOS XR, we need
the metric style wide on IOS XE

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as well because that's not
about the operating system,

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it's about the protocol.

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So as you can see,
this is actually

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fairly similar to what
we had to do in OSPF.

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The only difference here is
instead of specifying an area,

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we specified the
level of the database

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that we want to enable
traffic engineering for.

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So in this video,
we took what we

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could consider the final step
in actually preparing our core

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to run MPLS traffic engineering.

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And that is we simply enabled
the traffic engineering

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extensions for our
underlying IGP.

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We actually configured it on
the command line for OSPF.

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And then, of course,
we saw over here

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how to configure it for IS-IS.

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Now all of this brings
us up to the point

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that we're actually finally
ready to build some MPLS TE

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tunnels.

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And that's exactly
what we get 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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