[75709] in North American Network Operators' Group
Re: Diffserv service classes
daemon@ATHENA.MIT.EDU (Joe St Sauver)
Sun Nov 21 13:05:22 2004
Date: Sun, 21 Nov 2004 10:04:53 -0800 (PST)
From: Joe St Sauver <JOE@OREGON.UOREGON.EDU>
To: tme@multicasttech.com
Cc: nanog@merit.edu
X-VMS-To: IN%"tme@multicasttech.com"
Errors-To: owner-nanog-outgoing@merit.edu
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
