[AG-TECH] Multicast question

Natalia Costas Lago natalia at cesga.es
Tue Jul 19 02:12:22 CDT 2005

Yeah, but I think he wanna know about a proper multicast source. It is clear 
the receivers have to join the group and that traffic is to be sent, but it 
seems to me that it does not influence the tree built to deliver traffic 
from a source to several receivers (that is probably what they network guys 
wanna know).

But it's just a thought, i know very little about multicast.

----- Original Message ----- 
From: "Thomas D. Uram" <turam at mcs.anl.gov>
To: "Caren Litvanyi" <litvanyi at grnoc.iu.edu>
Cc: "Natalia Costas Lago" <natalia at cesga.es>; <ag-tech at mcs.anl.gov>; "Darin 
Oman" <darin at ucar.edu>
Sent: Monday, July 18, 2005 8:53 PM
Subject: Re: [AG-TECH] Multicast question

> And for RTP, there is a data channel and a control channel.  Even if 
> nothing is being sent
> over the data channel (e.g., vic listening for video streams but not 
> sending), data is
> still sent on the control channel for membership, etc.
> On 07/18/05 13:09, Caren Litvanyi wrote:
>> On Mon, 18 Jul 2005, Natalia Costas Lago wrote:
>>>It's not. A video producer service is a source.
>> Usually true.  But it really depends on the application.
>> I have seen client apps that speak on some multicast group
>> in the background for, say monitoring...
>> Also, simply joining the group does involve a small amount of
>> multicast out from clients for IGMP membership reports.
>> Caren

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