From: Anthony Sequeira (terry.francona@gmail.com)
Date: Mon Jun 13 2005 - 11:46:47 GMT-3
What you should be seeing are automatic entries generated for
224.0.1.40. This is caused by Cisco's Auto-RP process. Auto-RP
actually relies upon multicast for its functionality, and therefore,
your routers are ready to participate in and route for this group.
If you are truly seeing the address 224.0.1.24 showing up
automatically - I am a bit puzzled - when I looked this address up -
it seems to be a Microsoft related Multicast address. I assume you
have Microsoft servers attached to your routers?
On 6/13/05, Sheahan, John <John.Sheahan@priceline.com> wrote:
> When you first turn up multicast with the command "ip multicast-routing"
> and add the appropriate PIM statements on the interfaces, you usually
> get a (*,G) for a certain multicast group destination. For instance, (*,
> 224.0.1.24).
>
>
>
> I see that this will occur even when you have no source traffic to the
> destination (in this case, 224.0.1.24).
>
> When the source starts up, you will then see (10.1.1.1, 224.0.1.24) in
> the mroute table.
>
>
>
> My question is, what causes the router to know about and put in the
> (*,224.0.1.24) entry when there is no source? Is this caused by a
> join-request for that group? How does the router initially know about
> this multicast destination and why does it not note the source?
>
>
>
> thanks
>
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