It is driven by the application. The application decides it wants to work
by multicasting packets or receiving multicast packets, so it reports it
wants to join multicast group X where X is a multicast IP that was either
coded into it, or configured by the user.
If you have two users with the same application, but they enter different
multicast IPs to use, they won't be able to talk because they will be in
different groups.
----- Original Message -----
From: "Mike Balistreri" <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: <[EMAIL PROTECTED]>
Sent: Thursday, January 18, 2001 10:35 PM
Subject: Multicast Group Join???
>
> I'm studying CCNP Switching and am hung-up on a part of multicast.
>
> Multicast works by a client sending a membership report that it wants to
> join a particular multicast group.
>
> I do not understand how the client knows about the existence of any
> particular group or what it's multicast address would be, or what
> application/service the client will receive as a part of that group.
> How does a client know enough about the group to want to join the group.
>
> I understand the layer 3 and layer 2 of it all, but I'm having a
> disconnect as to how it all interacts with the higher levels of the
> stack.
>
> Thank You,
>
>
> Mike B.
>
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