Diffserv service classes

Sun Nov 21 19:31:21 UTC 2004

No doubt what you say is true, however, the typical 
eVLBI site is not part of the Internet2 (and also
doesn't need the TCP aspects of the Scavenger service).

There are certainly applications and users out there that would
like to use all of the bandwidth possible, but do not need
to step on other, more bit sensitive, services.

Regards
Marshall 

On Sun, 21 Nov 2004 10:04:53 -0800 (PST)
 Joe St Sauver <JOE at OREGON.UOREGON.EDU> wrote:
> 
> Hi,
> 
> Less-than-best effort traffic as implemented via the Internet2 Scavenger
> Service (see: http://qbone.internet2.edu/qbss/ ) never really took off;
> for example, see http://netflow.internet2.edu/weekly/20041108/#dscp
> which notes that Scavenger Service (DSCP=8) tagged traffic makes up less
> than 1% of all octets and less than 1% of all packets.
> 
> One can argue chicken-and-egg (e.g., had it been supported on the commodity
> Internet, it would have been more successful), but I think the bottom line
> reality was that because
> 
> -- Internet2 was/is uncongested, and because 
> -- the typical university user of I2 pays $0/Mbps used anyhow,
> 
> the motivation for users to tag traffic as Scavenger was typically 
> non-existent (offering a "discount" from a price of zero is hard unless 
> the model would involve PAYING people who generate less-than-best-effort 
> traffic, a model which strikes me as, well, somewhat 
> unsustainable/politically difficult).
> 
> A network administrator at a site might unilaterally tag all traffic of a
> particular type as less-than-best-effort, but again, unless there is 
> congestion, that tagging would be to no effect.
> 
> Regards,
> 
> Joe St Sauver (joe at oregon.uoregon.edu)
> University of Oregon Computing Center