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[AUDIO LOGO]

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Hello, and welcome to
Discovering MPLS Layer 3 VPNs.

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In this skill, we're
going to be going over

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the technical information
about layer 3 VPNs as far as

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how they work,
how they function,

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and all of the
different moving parts.

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There are quite a
few moving parts

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here that we need to deal with.

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Each of those moving
parts is designed

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to address a specific issue.

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So what are the moving parts
that we need to discuss?

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Well, we're going to start
off by talking about VRFs,

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or Virtual Routers
and Forwarders,

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and how we use those to separate
customer routes on the network

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edge.

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But once those have
been separated,

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we then have to start
talking about core routing.

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What do we mean by core routing?

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Well, the routes have to
get from one PE router

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to another PE router.

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And that means they
have to be kept separate

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as they pass through the
service provider core.

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The next problem we're
going to have to address

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is route distribution.

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Now, what this really means
is once we pass the routes

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through the core, then
we have to determine

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which VRF those routes go
in on the egress router.

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We have to know how to separate
the routes per customer.

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Now, something else we're
going to be addressing here

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is central service VPNs.

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These are, of course, optional.

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But the service provider can
use these to offer services

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to their customers.

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But we have to be
careful that we

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don't join the customers
to gather or leak

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the routes between the customers
through the central service

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VPN.

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Finally, we're going to wrap up
by talking about CE-PE routing.

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This is the routing
protocol that's

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going to be run between the
customer and the provider.

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We have some different
choices here.

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And it really is up to
the service provider

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to choose which protocols
they're going to support.

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So we'll talk about some of
the pros and cons of each one.

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I will throw out
there that using BGP

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is really the most
common choice.

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However, there are
other options available.

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So let's go ahead and
jump in and get started.

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Lots of things to talk about.

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We're going to
have a lot of fun.

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I'll see you in the next video.

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