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@oregon.uoregon.edu) University of Oregon Computing Center