RE: [ssm] Who uses SSM?

"Sundeep Singatwaria" <> Wed, 17 November 2004 19:54 UTC

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From: "Sundeep Singatwaria" <>
To: "'Beau Williamson'" <>, Marc Barisch <>,
Subject: RE: [ssm] Who uses SSM?
Date: Wed, 17 Nov 2004 11:34:44 -0800
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Beau - All routers that can support PIM-SM in hardware can also support
PIM-SSM. We have customers using SSM mainly in the enterprise space. 


-----Original Message-----
From: []
Sent: Wednesday, November 17, 2004 7:21 AM
To: Marc Barisch;
Subject: Re: [ssm] Who uses SSM?

At 11/17/2004 07:30 AM, Marc Barisch wrote:
>I have read about the advantages of PIM-SSM over PIM-SM from a technical
>point of view.
>For a seminar paper at my university, I would like to provide some figures
>concerning the deployment of the different PIM modes, especially regarding
>TV broadcast over packet networks.
>Does anybody know of providers using PIM-SSM or are using all PIM-SM?
>Are there any commercial deployments regarding PIM-SSM and IPv6.
>Thanks in advance


This is a classic case of "The spirit is willing but the flesh (hardware) 
is weak."

The advantages are certainly well known and there is a growing push to 
build networks that support SSM.  Unfortunately, the support for IGMPv3 is 
still not pervasive enough in end-stations and (in some cases) edge routers 
and switches to actually deploy SSM.  This is slowly changing and I expect 
(I hope) that we will soon see greater deployments of SSM for one-to-many 
multicast applications.

Beau Williamson 

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