> >Does anyone know is use of DiffServ field supported in some equipment and > >networks? > > It is supported in some equipment. I wouldn't be able to tell you how > networks configure their equipment; they generally view this as NDA > information.
We have found some issues when trying to use the diffserv field in practical deployments. There are a number of routers in the network that were built and deployed before diffserv was widely accepted as a standard. Understandably, these routers implement the previous standard, i.e. the RFC 791 definition of the TOS bit. Specifically, the old routers look at the three precedence bits and treat it as a priority level. In practice, this restricts the number of diffserv code points that can be safely used. You don't want for example to define a code point for "less than best effort" in which the three precedence bits happen to mean "high priority" in the old routers... -- Christian Huitema -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
