[147991] in North American Network Operators' Group
Re: IPTV and ASM
daemon@ATHENA.MIT.EDU (Mark Tinka)
Thu Dec 29 05:04:57 2011
From: Mark Tinka <mtinka@globaltransit.net>
To: nanog@nanog.org
Date: Thu, 29 Dec 2011 18:03:20 +0800
In-Reply-To: <CABO8Q6R1kbG8N7-3KvXgYy9WtW1H4=-+OOapvDpL+uH=8WYwTQ@mail.gmail.com>
Reply-To: mtinka@globaltransit.net
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Thursday, December 29, 2011 08:02:04 AM Keegan Holley=20
wrote:
> Isn't source discovery and efficiency a big concern for
> ASM? If individual streams are tied to a specific
> source then it's possible to live without some of the
> overhead involved in ASM. Joins go straight to the
> source, traffic is disseminated via direct paths instead
> of being replicated by the RP, etc etc..
In our case, Source discovery happens once, and BGP updates=20
containing that information is sent to all Receiver PE=20
routers in the MVPN.
They then generate Type 7 routes locally (due to running=20
SPT-only mode), which are essentially (S,G) routes.
Once a customer sends a Join message to subscribe to a=20
group, the Receiver PE router just serves it locally. No=20
need to send any requests back to the RP.
This breaks regular PIM mechanisms, but is a welcome=20
deviation that makes a lot of sense.
One does have the option of running RPT-SPT modes which are=20
akin to regular IP Multicast.
Mark.
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