Robert, On Nov 29, 2009, at 03:48 MST, Robert Raszuk wrote: > Tony, > > Isn't it a case that multicasting has been already obsoleted in the quite > significant degree by peercasting ? > > http://www.viswiki.com/en/Peercasting
IMHO, I think it's rather difficult to predict that peercasting has/will obsolete multicast, at least in the U.S. and, specifically, for truly "live" content, e.g.: sports, news broadcasts, etc. Unfortunately, the usual chicken-and-egg problem exists: no widely appealing, legitimate content exists, therefore there is no demand, hence very few SP's set-up their infrastructure to provide multicast down to CE devices. However, with the dearth of *unicast* time/place-shifted video content coming online by the major players (cf: Hulu, Apple, Netflix, Blockbuster, etc.), it may be a matter of time, before we start to see a growing demand for *multicast* video for 'live' content, given the inherent efficiency of multicast. Furthermore, while peercasting is an intriguing application-level form of multicast, (therefore, allowing a content owner/distributor more control over when & how they distribute their content w/out having to wait for the network to be ready), it's not without it's "challenges", specifically: - asymmetric BW on residential access circuits, making it difficult to hairpin/push content back up into the network; - lack of some form of CoS on lower bit-rate residential lines to either: a) assist with pushing hair-pinned content back up into the network; and/or, b) avoid interfering with other legitimate apps on the access circuit, (e.g.: VoIP, etc.) - etc. I guess time will tell. -shane > > And I am not that convinced that replication at network router/switch level > is that much more efficient then replication at the network host level. I > think it is just a matter of efficiently determining the optimal replication > points. > > Cheers, > R. > >> Dino Farinacci wrote: >>> Well if multicast proper is not on the requirements for scaling the routing >>> architecture, how can we set our sights higher? >>> >>> Do you expect multicast route scaling to be solved in some other forum like >>> perhaps SAMRG? >> I think you can just work on it. No permission is required. But first you >> should take this up with the guys who have been working on multicast for the >> last 17 years. ;-) >> Seriously tho, if that's a useful work item, the RG can take it up after >> this work item is complete. >> Tony >> _______________________________________________ >> rrg mailing list >> rrg@irtf.org >> http://www.irtf.org/mailman/listinfo/rrg > > _______________________________________________ > rrg mailing list > rrg@irtf.org > http://www.irtf.org/mailman/listinfo/rrg _______________________________________________ rrg mailing list rrg@irtf.org http://www.irtf.org/mailman/listinfo/rrg
