[120778] in North American Network Operators' Group
RE: Experiences with Comcast Ethernet/Transit service
daemon@ATHENA.MIT.EDU (Antonio Querubin)
Mon Jan 4 15:13:55 2010
Date: Mon, 4 Jan 2010 10:13:00 -1000 (HST)
From: Antonio Querubin <tony@lava.net>
To: "Holmes,David A" <dholmes@mwdh2o.com>
In-Reply-To: <485ED9BA02629E4BBBA53AC892EDA50E0A4B7D8E@usmsxt104.mwd.h2o>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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@lava.net
