mailing list archives
RE: How do you put a TV station on the Mbone?
From: david raistrick <drais () icantclick org>
Date: Fri, 29 Apr 2011 18:34:26 -0400 (EDT)
On Fri, 29 Apr 2011, George Bonser wrote:
Exactly. If more people/networks took advantage of multicast, it would
greatly reduce the bandwidth requirements, particularly for live events.
If there were 50 people listening to a popular radio show or watching a
1) As a consumer network (enterprise, home) - that case is VERY rare. 50
people consuming it at your house? Or at the office consuming the same
feed? (even at a 10k employee company, the rate of that is fairly low,
particularly on the same leg of the network - I'd love to see some
statistics that prove me wrong). The amount of work that goes into
supporting and maintaining this is much higher than the return I'd get
from it. Even assuming the upstreams supported it.
2) as a content provider, there's a lot of extra work involved to maintain
this with my upstreams, and every mid-stream between me at the consumer
networks. I require specialists in multicast (comparatively speaking
unicast specialists are a dime a dozen) and I have to fight a lot of
politics with the upstreams, and I -still- have to support the unicast
models so the folks who can't consume multicast can see my content.
3) as an a midstream network provider I have almost no motivation to
support this. Sure, my network usage would be reduced - but I (more or
less simplified here, but) make my living on each bit of traffic I carry -
if I offered a way for providers and consumers to reduce their traffic,
that would reduce the amount they pay me. Win for them, lose for me.
the fact of the matter is that until multicast or it's like -doesn't-
require massive end-to-end support (and frequently configuration to
support each stream), there won't be heavy use of it. When I can turn
up a multicast stream as easily as I can turn up a unicast stream, there
is -still- a absolute lack of client-side software to recieve and playback
the streams, and very limited support for broadcasting the streams.
...david (one time multicast specialist supporting a 200,000 seat 4
channel multicast infrastructure, so I'm fully aware of what magic is
really involved in maintaining it across divergent networks that -WE-
owned (or could exercise control of). before that streaming 40Gb/s (~200
channels of unicast video for general consumers + on demand streams)
david raistrick http://www.netmeister.org/news/learn2quote.html
drais () icantclick org http://www.expita.com/nomime.html