Experiences with Comcast Ethernet/Transit service

Jared Mauch jared at puck.nether.net
Mon Jan 4 22:10:51 UTC 2010

The Deathstar opt-e-man service says they will knee-cap you at 1Mb/s of multicast.

- Jared

On Jan 4, 2010, at 4:56 PM, Holmes,David A wrote:

> PIM-snooping is not in the MEF specs, but should be if multicast is to
> work properly over a carrier's Ethernet service. Regardless of the
> specs, RFPs and other user requirements for Ethernet services should
> include a "must have" clause requiring PIM-snooping functionality. 
> -----Original Message-----
> From: Antonio Querubin [mailto:tony at lava.net] 
> Sent: Monday, January 04, 2010 12:13 PM
> To: Holmes,David A
> Cc: Brandon Galbraith; nanog at nanog.org
> Subject: RE: Experiences with Comcast Ethernet/Transit service
> On Mon, 4 Jan 2010, Holmes,David A wrote:
>> I do not know of Comcast's Ethernet services specifically, but a
> general 
>> problem with carrier Ethernet services that are based upon the Metro 
>> Ethernet Forum (MEF) is that PIM-snooping is not implemented for 
>> multicast traffic. The absence of PIM-snooping results in the
> carrier's 
>> Ethernet service operating like a 1990's style Ethernet hub in which 
>> (S,G) multicast packets are incorrectly flooded out all user ports.
> Not implemented because it's not in the MEF specs or not implemented 
> because of carrier operational practice?
> Antonio Querubin
> 808-545-5282 x3003
> e-mail/xmpp:  tony at lava.net

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