http://www.rfc-editor.org/rfc/rfc2475.txt
RFC 2475: An Architecture for Differentiated Services, S. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss1998-12-01T23:00:00-00:00This document defines an architecture for implementing scalable service differentiation in the Internet. This memo provides information for the Internet community.