http://www.rfc-editor.org/rfc/rfc2597.txt
RFC 2597: Assured Forwarding PHB Group, J. Heinanen, F. Baker, W. Weiss, J. Wroclawski1999-06-01T23:00:00-00:00This document defines a general use Differentiated Services (DS) Per-Hop-Behavior (PHB) Group called Assured Forwarding (AF). [STANDARDS-TRACK]