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[AUDIO LOGO]

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Hello and welcome to
implementing OSPF as the CE-PE.

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In this skill, we're
going to be focusing

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on the caveats of using
OSPF between the provider

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and the customer.

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The first thing we want
to look at is route types.

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If you're following along
from our previous skill,

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we already have OSPF up and
running in an MPLS layer 3

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environment, but those routes
are currently coming through

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as external routes.

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That's not really
desirable for the customers

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so we'd rather have them
come in as internal routes.

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So we'll be controlling our
route types in our environment.

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The second thing
we want to look at

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is going to be loop prevention
in OSPF in relation to MPLS,

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specifically we're talking
about the downward bit.

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So we'll see when and
how the downward bit gets

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set, when it gets looked
at, when it gets ignored,

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and how that can cause
situations for our customer

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depending on how they
want to run their network,

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and then, of course,
how to fix that.

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And then we'll wrap up with
talking about SHAM links.

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SHAM links are not really
all that common in the MPLS

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environment because they
do take a bit of work

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on the service provider
side, therefore,

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scalability is an issue.

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However, they can be used to
solve some specific issues

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that our customers may
have with path selection

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if they want to
have a backup link

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and use the MPLS environment
as their primary path.

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So as you can hear, we have
a lot of stuff to cover.

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Hopefully, we'll
have a lot of fun.

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Let's go ahead and
jump in and get

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started, and I'll see
you in the next video.

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