Re: [ssm] msnip status

hoerdt Mickael <hoerdt@clarinet.u-strasbg.fr> Thu, 20 October 2005 10:16 UTC

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Date: Thu, 20 Oct 2005 12:15:50 +0200
From: hoerdt Mickael <hoerdt@clarinet.u-strasbg.fr>
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To: Pekka Savola <pekkas@netcore.fi>
Subject: Re: [ssm] msnip status
References: <20051019124841.GL9025@storhaugen.uninett.no> <ce8f3212bc8ba11a7739b4c9433e3a22@innovationslab.net> <20051019231203.GG29643@cisco.com> <Pine.LNX.4.61.0510201201450.27313@netcore.fi>
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Cc: Toerless Eckert <eckert@cisco.com>, Brian Haberman <brian@innovationslab.net>, Isidor Kouvelas <kouvelas@cisco.com>, ssm mailing list <ssm@ietf.org>
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Hi,

MSNIP (or any logical equivalent, let call it protocol X) allows 
ressources saving at the following points of the network :

1. the DR(s).
2. the link connecting the DR to the multicast source host(s).
3. the host(s).

A possible scenario showing that protocol X is (relatively) useful would 
be the following :

. Exhaust the ressources available at any of these three points, 
sourcing multicast
  content without  protocol X.
. Activate protocol X, and replay the same scenario showing that now the 
ressources
  aren't exhausted.
 
Does it make sense to define a protocol X wich do not have to be 
deployed/implemented
in the routers, using possibily unicasting and/or pooling from the 
source ? As a multicast
application developer/coder, i would say that it depends on the SSM 
multicast service
availability....

Hoerdt Mickaƫl





Pekka Savola wrote:

> On Wed, 19 Oct 2005, Toerless Eckert wrote:
>
>> I think MSNIP tried to solve a key functionality for the SSM 
>> architecture,
>
>
> Could you elaborate a bit on what you think is this "key 
> functionality" and why exactly it's "key" (e.g., specific scenarios 
> you have in mind)?
>
> I'm having difficulty understanding the (relative) importance of a 
> sender being able to stay quiet if there are no receivers.  The waste 
> of bandwidth and processing power at the DR (who'd just discard the 
> traffic) doesn't seem to be sufficiently concinving at least in the 
> scenarios I have in mind.
>


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