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[MUSIC PLAYING]

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So now that we have MPLS traffic
engineering tunnels enabled

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on the correct interfaces
on our core devices, now

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we have to configure those
interfaces to support RSVP.

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And as we're doing
that, we're also

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going to configure them
for the total amount

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of bandwidth available
for MPLS TE tunnels.

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Plus we can also configure
a maximum per flow.

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So there's a grand
total, and then there's

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the amount per flow
that we can reserve

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for RSVP, in other words,
our MPLS TE tunnels.

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So as usual, let's just
jump into our topology

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real quick, just to get a quick
reminder of what interfaces

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and what devices we
need to configure.

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Then we'll jump into
the command line

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and get RSVP up and running
in our MPLS TE core.

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OK.

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So we are still on
MPLS topology 1.

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And what we're going to
be configuring is RSVP.

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In pretty much the same as we
did with traffic engineering

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itself, we're going
to have to enable

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RSVP on all of these interfaces
on each of these devices.

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It has to be enabled on
all of the interfaces

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that we're going to be trying
to run MPLS traffic engineering

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tunnels through.

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So again, this is going to be
all of our routers, routers 1

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and 2, or of course,
gigabit 1 and gigabit 2.

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Router 5 is the gigabit 1.3
and the gigabit 1.4 again.

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And of course, routers 3 and
4, all of their interfaces,

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because they are the PE routers.

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So let's go ahead and jump in.

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And once again, we
will start on router 1.

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So we'll begin just by going
into configuration mode.

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Then we go into RSVP
configuration mode.

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And we begin to
configure our interfaces.

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So first interface, gigabit 1.

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And remember, one of
the things we want to do

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is specify how much
bandwidth is going

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to be available to RSVP
and therefore, our tunnels.

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So if we're going to
specify our bandwidth,

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you see we have a
couple of choices here.

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We could do it by percentage
and things like this.

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But what we're going
to do is we're just

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going to configure the
total resolvable bandwidth.

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We can do this in kilobits per
second, megabits per second,

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or gigabits per second.

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Let's just go ahead
and configure 2000.

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It'll default to
kilobits per second.

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And then we can
specify how much is

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going to be available per flow.

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And once again, this can
be configured in kilobits,

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megabits, or gigabits.

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We'll just put in 1000.

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This would basically
give us room

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for two tunnels
on this interface,

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assuming that they use
the maximum observable

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bandwidth for each tunnel.

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We'll do the same
configuration for gigabit 2.

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We'll commit those changes
and exit configuration.

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Now a couple of things we can
do to verify this, let's start

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with a show RSVP summary.

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We do see that it's
primary active.

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The NSR and the ISSU status
are currently not ready.

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And the interfaces are set to 2.

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Those are the two interfaces,
of course, we just enabled.

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We can also look at the
specific interface information.

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And what is this telling us?

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First, we see that our two
interfaces that we chose

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are, in fact, enabled.

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Then we see the maximum
bandwidth that's reservable.

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And we see that it's showing
it as 2 megabits per second.

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That's, of course,
because we put

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in 2000 kilobits per second.

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We could have, of course, just
said 2 megabits per second.

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We see that the max
flow is the same thing.

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It's converted to 1,000
kilobits per second

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to 1 megabits per second.

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And then we see that
currently, nothing

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is allocated out of that pool.

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Of course, this is because
we've configured just one router

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at this point.

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We'll, of course,
see this change

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as we move through the
rest of this demonstration.

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So now we'll configure the
same thing on router 2.

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So again, we go into
RSVP configuration,

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into our interfaces.

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We set the bandwidth.

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And this time, we'll do
it in megabits per second.

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So we'll say 3 megs and 1 meg.

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We'll do the same for
interface gigabit 2.

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Commit the changes.

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Exit configuration.

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And then we'll
verify this again.

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We'll just go right to
the show RSVP interface.

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And we see here that the
output looks exactly the same

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as router 1, even though we
entered our bandwidth numbers

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a little bit differently.

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So really, your preference,
how you want to enter those

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bandwidth numbers.

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Obviously, the bigger the
number gets, the more likely

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it would be that you'd want
to use megabit or gigabit.

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So next up, let's
configure router 3.

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Same configuration, but we
have more interfaces here.

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So it's gigabit 0, gigabit
1, gigabit 2, and gigabit 3.

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Commit the changes.

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And exit configuration.

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So once again, let's verify it.

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And these are all
configured properly.

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So finally, let's do router 4.

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We'll just copy and
paste router 4's

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config in because that's
exactly the same as what

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we've been doing.

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We'll do our show
RSVP interface.

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And we see that, again,
all of these interfaces

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are configured correctly.

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So finally, once again,
this brings us to router 5.

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Slightly different
configuration here,

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both because it's
using some interfaces

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and because it's iOS XE.

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So let's jump into router 5.

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So like most of the differences
between iOS XR and iOS XE,

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rather than configuring
this under a dedicated RSVP

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config mode, this is done under
the interfaces themselves.

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So we'll go into
interface gigabit 1.3.

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And we say ip rsvp bandwidth.

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And we see that, once again,
we can enter this information.

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Here on iOS XE, it supports
kilobits per second,

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so we'll say 2000.

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Same with the largest
reservable per flow.

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And remember, of
course, there are

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other things you can do here is
far as percentages and things

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like that.

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We'll do the same thing
for interface gigabit 1.4.

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Exit our configuration.

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Then we'll do a show
ip rsvp interface.

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Now a few things to note
here about this output.

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First thing to note is that
the gigabit 1 interface

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itself is set to 750
meg, which, of course, is

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75% of 1 gig, which is
what this interface is.

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It's a gigabit interface.

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So we see that if
we don't configure

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the reservable bandwidth,
it defaults to 75%.

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The other thing to
note is that when

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it comes to admission
control, not only

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do we consider the bandwidth
we put on the subinterfaces,

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but it'll consider the bandwidth
on the parent interface

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as well.

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Now in this case, of
course, the parent interface

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has way more bandwidth
than our subinterfaces.

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But if we wanted to
configure this to match up,

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we can actually do that.

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Let's take a look.

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Let's go back into
configuration,

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into interface gigabit 1.

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And let's say ip rsvp bandwidth.

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Now of course, we need this to
cover both subinterfaces now.

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So this would be 4000 and 2000
to cover the two subinterfaces.

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If we look at this again, again,
we didn't have to change this,

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but this would make
a little more sense

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based on how we're trying
to configure our bandwidth.

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Also, another slightly
different command

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we could use here on
iOS XE is show ip rsvp.

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And this will tell
us that we have

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it enabled on three interfaces,
where the rate limiting is

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enabled and things
along that line.

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It tells us a lot of information
about the RSVP process

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running on this router.

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So in this video, we
talked about setting up

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RSVP on the interfaces
on our core routers.

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We saw on iOS XR that it has
its own separate configuration

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mode, like a lot
of our features do.

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And we configure our bandwidth
under the interfaces there,

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either in kilobits per
second, which is the default,

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or we can specify megabits or
gigabits per second in addition

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to some other features
such as doing it

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based on the percentage of the
available interface bandwidth.

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We also saw how
it default to 75%.

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Now on iOS XE, remember
that the configuration

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moves to be under the
interface themselves,

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like a lot of things
are on iOS XE.

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But at the end of the
day, the configuration

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was pretty much the same thing.

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Also note that when you're
configuring subinterfaces,

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we need to make sure that
there's enough available

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bandwidth on the parent
interface as well.

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Otherwise, we could
fail at mission control.

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Now all of this takes
care of setting up RSVP.

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But don't forget, we also
need to configure our IGP

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to support traffic engineering.

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And that's 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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