All things related to multicast

[Bob Riddle <>]

I think we should ask all multicast "clients" to raise their hands.

(sorry, I couldn't help myself .... :-) )




 wrote:

> On Thu, 4 Sep 2003, Marshall Eubanks wrote:
>
>  
>
> > On Thu, 4 Sep 2003 14:35:53 -0700 (PDT)
> > Greg Shepherd 
> > <>
> >  wrote:
> >    
> >
> > > On Thu, 4 Sep 2003, Marshall Eubanks wrote:
> > >
> > >      
> > >
> > > > On Thu, 04 Sep 2003 16:03:28 -0400
> > > > Jon Zeeff 
> > > > <>
> > > >  wrote:
> > > >        
> > > >
> > > > > How can I find out what are the most popular multicast uses on the
> > > > > Internet? Or perhaps on Abilene (where netflow data is available).
> > > > >
> > > > >
> > > > > For example, I assume that some of the UofOregon traffic is popular, but
> > > > >          
> > > I
> > >      
> > >
> > > > > don't know for sure.
> > > > >
> > > > >          
> > > > Ever since ASM RTCP receiver reports withered and died, no one really
> > > >        
> > > knows.
> > >      
> > >
> > > > I am not really sure why this happened. Many people think that having
> > > > each member of a large group send to every other member is not a good
> > > >        
> > > thing,
> > >      
> > >
> > > > but I do not think that it was caused by complaints.
> > > >        
> > > I recall and early 'complaint' was during the NetAid broadcast. The issue
> > > was not the sending/recieving of the packets, but the potential explosion
> > > of state in the routers. Every sending 'receiver' would create an S,G
> > > entry in the network. We were targeting 10K's of S's for just this one G.
> > > It became clear that any large audience adoption of mcast would create an
> > > unmanagable amount of network S,G state IF ASM RTCP were the receiver
> > > reporting mechanism.
> > >
> > >      
> > >
> > > > My experiments indicate that I do not get RR's for more than a tiny
> > > > fraction (<< 1/10th) of the audience, but what that fraction is
> > > > is unknown. Most times all I really know is whether or not
> > > > I have outbound state.
> > > >        
> > > Marshall, does your app use mcast of ucast for receiver reports?
> > >      
> > The MCTPlayer does send back unicast RR's here, but its use has never been 
> > more
> > than a small fraction of the total usage of our MP3 channels (about 1/8th
> > of reported usage, which is of course not the full usage).
> >
> > Our new video multicasts use Quicktime (and Real, as soon as we get
> > the bugs out), and those use standard RTCP.
> >    
>
> 'standard' RTCP being mcast?
>
> Greg
>
>  
>
> > Marshall
> >
> >    
> >
> > > Greg
> > >
> > >      
> > >
> > > > Marshall
> > > >
> > > >
> > > >        
>
>
>  

--
Bob Riddle 
()
    Technologist,Internet2
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