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[MUSIC PLAYING]

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So now that we have
multi-protocol BGP

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up and running in the
core of our network,

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it's now time to run a CE-PE
protocol to actually get

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the routes from the
customers to the PE routers

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so that multi-protocol
BGP can then carry

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those routes through the core.

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Now, in this particular
demonstration,

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we're just going to be
doing a very simple OSPF

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setup as our CE-PE.

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We have other skills
coming up that will

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cover using OSPF and other CE-PE
protocols in much more detail.

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So for this
demonstration, we're just

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going to be setting up
a quick, easy example

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so that we can get our MPLS
Layer 3 VPNs functional.

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So let's go ahead
and get started.

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As usual, we'll take a look
at that topology first,

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so we know what we're going
to be running, and where.

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And then we'll jump into the
command line, and get this up

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and working.

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So what we're going
to be configuring

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in this demonstration,
we're going

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to configure Customer
A to run OSPF.

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And in particular, we're going
to put everything into area 0.

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So what we're going to do is,
for the customer routers--

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so that will be Router 6, Router
8 over here, and Router 9--

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we're simply going to
configure OSPF area

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0 on all of the interfaces
on those devices.

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Then of course, on the PEs--

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Router 1 and Router 5--

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we're going to be configuring
the VRFs for Customer A

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to be running OSPF.

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And then we're going to set
up redistribution between OSPF

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and BGP on both of the
PE's mutual redistribution

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so that our OSPF routes end
up in BGP and vise versa.

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So that said, let's go
ahead and get started.

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We'll just jump in on Router 1.

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So the first thing we
need to do is configure

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a process for OSPF.

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Here, we'll use process 100.

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And then we assign
this to the VRF.

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So we'll say VRF Customer
A. We'll go into our address

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family for IPv4 unicast, into
the configuration for area 0,

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and we'll assign
interface gig 0/0/0/0,

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which is the interface facing
our customer, Router 6.

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And while we're in
here, let's also

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configure the network to be
a point-to-point OSPF network

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type.

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We'll go ahead and
commit those changes.

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And we'll exit
configuration for now.

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Now let's go out and
configure Router 6,

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which is the customer
side of this connection.

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On the customer routers, we're
going to do a very generic OSPF

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configuration.

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We'll just say Router OSPF 1.

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We will set the router ID.

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And then we'll simply
use a network statement

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to bring all of the interfaces
on this device into area 0.

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Now, we will have to go into
our interface gigabyte 1

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and set it to IP OSPF
network type point-to-point,

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since that's what
we did on Router 1.

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And what we see here after
a slight delay of OSPF

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resetting that connection when
we change it to point-to-point,

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we see that neighbor
10.1.1.1 on gigabit 1

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went from loading to full, which
means it should be operational.

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Let's go see if Router 1 is
actually getting the routes

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from Router 6 now.

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We'll just do a show IP
route for VRF Customer A.

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And We see that we are, in fact,
getting Router 6's loopback 0

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and loopback 100 interface,
which is the 10.100.1.6.

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So now that we have this side
of our connection configured,

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let's go over and configure the
PE Router 5 for the other side

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of the connection.

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So here on Router 5, we'll
create an OSPF process

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for each customers' VRF.

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So we'll say, router OSPF.

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And we'll just use 101 as the
process ID for VRF Customer A1.

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Because remember,
we have two VRFs

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on this router for Customer A.

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And then we'll do the
same thing, but for A2.

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We'll make this 102.

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Then we'll configure
our interfaces.

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So we'll start with
interface gigabit 2.

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We'll put this in
IP OSPF process 101.

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Of course, in area 0.

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And we'll change
the IP OSPF network

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type to be point-to-point.

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We'll do essentially the same
thing for interface gigabit 3.

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But of course, this will be
an OSPF process 102, still

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in area 0.

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And of course, we still want
to change the network type

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to point-to-point.

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So that should take care
of our configuration

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so far on Router 5.

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Let's go ahead and go
over to Router 8 next.

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Router 8 is going to be the
same configuration as Router 6,

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with the exception
of the router ID.

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So that said,
we'll just go ahead

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and paste this configuration.

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We can see that
it's already formed

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a neighborship with Router 5.

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And let's do the same
thing for Router 9.

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So again, we'll simply
paste the configuration in.

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We see our neighborship
with Router 5 has come up.

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So as we did before, let's go
back to the PE, and make sure

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it's learning the
routes properly.

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So back here on
Router 5, we'll simply

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do a show IP route for
the VRF Customer A1.

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And we see it's getting OSPF
routes from the customer.

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And if we look at A2, we'll see
it is also getting OSPF routes

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from the customer.

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So OSPF is working properly
between the CEs and the PEs.

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So our final step
is simply going

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to be to redistribute
between OSPF and BGP

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bidirectionally on the PEs.

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So that said, let's just go
ahead and start on Router 1.

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Let's just start under BGP.

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So we're going to router BGP
100 for the VRF Customer A

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into our address
family IPv4 unicast.

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And we'll simply say to
redistribute OSPF 100.

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And we'll go ahead and say
to match internal, external,

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and NSSA external,
just so we make

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sure we're including
any possible routes

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the customer can send to us.

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Then we'll go into our
router OSPF process.

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Again, into the
VRF for Customer A.

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And we'll say to
redistribute BGP 100.

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We'll commit our changes and
exit out of configuration.

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Let's go do the same
thing on Router 5.

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Of course, the syntax here
is going to be different.

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So we'll go into
configuration mode.

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We'll start with
router OSPF 101.

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We'll say to
redistribute BGP 100.

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Then we'll go into
router OSPF 102,

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and we'll say the same thing.

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So that takes care of
redistributing the BGP

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into OSPF.

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Now let's go into
router BGP 100.

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Then we'll go into the
address family for IPv4

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for the VRF Customer A1.

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And we say to
redistribute OSPF 101.

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And once again, we'll
put on the match

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external, internal,
and NSSA external.

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Next, we'll go to
the address family

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for IPv4 for Customer A2.

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And we'll use the same
redistribution line.

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We just, of course, have to
change the OSPF process to be

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VRF Customer A2's OSPF process.

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We'll go ahead and
exit configuration.

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And then let's go out
to the customer routers

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and verify that this is working.

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So on Router 6, let's
just do a show IP route.

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And we see that we're
actually getting

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a whole lot of
OSPF routes, which

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look like the routes
coming from the other side.

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Let's verify Router 8.

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We'll do a show IP
route here as well.

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Once again, we see some OSPF
routes coming from Router 6.

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And we should see the
same thing on Router 9.

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And again, we see some Router
6 routes showing up here

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on Router 9.

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So this certainly looks
like it's working.

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Let's see if we're
actually getting traffic

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through our environment.

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Let's go back over to Router 6.

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And let's just try to
ping the loopback 100

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interface on Router 8.

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So that would be 10.100.10.8.

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And we'll source that from
our loopback 100 interface.

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And we can see
this is successful.

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Let's see if we can
ping Router 9 as well.

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That is on a different subnet
and a different IP address.

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But we can see that
that is also successful.

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So we have connectivity
between our customers

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through our Layer 3 VPN.

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So in this video,
we finished what's

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pretty much our last step
to get our Layer 3 VPN up

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and running, which is to put in
some form of a CE-PE protocol.

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Now, of course, in
this demonstration,

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we just did Customer A, and
we just did a very simple OSPF

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implementation.

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Again, we'll be
digging into this more

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in some future skills.

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But to wrap up this skill,
let's take a closer look

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at the traffic that's actually
going between the customer

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routers.

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We're going to do that
in the next video.

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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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