RFC 2996 (rfc2996) - Page 1 of 9
Format of the RSVP DCLASS Object
Alternative Format: Original Text Document
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