[140084] in North American Network Operators' Group
Re: How do you put a TV station on the Mbone? (was: Royal Wedding...)
daemon@ATHENA.MIT.EDU (Antonio Querubin)
Sat Apr 30 15:35:51 2011
Date: Sat, 30 Apr 2011 09:35:32 -1000 (HST)
From: Antonio Querubin <tony@lavanauts.org>
To: Chris Adams <cmadams@hiwaay.net>
In-Reply-To: <20110430173415.GB14461@hiwaay.net>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sat, 30 Apr 2011, Chris Adams wrote:
> I can also see how this affects the ISPs providing bandwidth to the
> content providers. In our colo for example, we rate-limit customers to
> the paid-for bandwidth at the colo port. With multicast however, they
> could use significantly more bandwidth, because every router in our
> network could potentially send the stream to many ports.
Only if you're using hubs or dumb switches. If your switch is multicast
aware, the multicast traffic only goes to ports with active listeners for
a particular group. Routers send multicast traffic only if there are
active downstream listeners (where "downstream" doesn't mean the same for
unicast as it does multicast).
--
Antonio Querubin
e-mail: tony@lavanauts.org
xmpp: antonioquerubin@gmail.com
