RFC 2996 (rfc2996) - Page 1 of 9

Format of the RSVP DCLASS Object

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Network Working Group                                         Y. Bernet
Request for Comments: 2996                                    Microsoft
Category: Standards Track                                 November 2000


                    Format of the RSVP DCLASS Object

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   Resource Reservation Protocol (RSVP) signaling may be used to request
   Quality of Service (QoS) services and enhance the manageability of
   application traffic's QoS in a differentiated service (diff-serv or
   DS) network.  When using RSVP with DS networks it is useful to be
   able to carry carry Differentiated Services Code Points (DSCPs) in
   RSVP message objects.  One example of this is the use of RSVP to
   arrange for the marking of packets with a particular DSCP upstream
   from the DS network's ingress point, at the sender or at a previous
   network's egress router.

   The DCLASS object is used to represent and carry DSCPs within RSVP
   messages.  This document specifies the format of the DCLASS object
   and briefly discusses its use.

1. Introduction

   This section describes the mechanics of using RSVP [RSVP] signaling
   and the DCLASS object for effecting admission control and applying
   QoS policy within a Differentiated Service network [DS].  It assumes
   standard RSVP senders and receivers, and a diff-serv network
   somewhere in the path between sender and receiver.  At least one RSVP
   aware network element resides in the diff-serv network.  This network
   element may be a policy enforcement point (PEP) [RAP] or may simply
   act as an admission control agent for the network, admitting or
   denying resource requests based on the availability of resources.  In
   either case, this network element interacts with RSVP messages
   arriving from outside the DS network, accepting resource requests



Bernet                      Standards Track
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