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[MUSIC PLAYING]

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Hello, and welcome to
discovering multicast routing.

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In this skill, we're going to be
taking a look at PIM operations

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on our network.

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So we'll start off with
some overall operational

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information.

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We'll talk about things such
as what an S,G entry is and how

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this operates within our
multicast routing table.

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Then we'll jump into something
called the RPF check,

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or the Reverse Path
Forwarding check.

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We use this for two major things
on our network, number one,

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knowing where to send
PIM join messages.

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And number two, we also
use it for loop prevention.

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Then we'll jump into
some detail on how

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dense mode works with PIM in
our multicast environment.

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This is also referred
to as flood and prune.

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And I think by the
time we get through

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that, you'll understand why.

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And finally, we'll wrap up with
sparse mode operation, which

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is generally the
preferred method of how

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we run PIM in our environment.

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It's a little more
complicated than dense mode,

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but ultimately, more efficient.

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So as you can hear, we have
a lot of really cool stuff

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to cover here.

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

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I'll see you in the next video.

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