Applications usually have a default/well-known
multicast group address they use. This may be
configurable depending on the app. Similar to port
numbers, most people use the defaults (80 for http, 23
for telnet, etc) but some people change them. If
someone changes the multicast group address from the
default then it is up to them to let people know what
the multicast group address is and how to change it in
the application.
--- Mike Balistreri <[EMAIL PROTECTED]> wrote:
>
> 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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