RMD-QOSM: The NSIS Quality-of-Service Model for Resource Management in Diffserv
RFC 5977

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Internet Engineering Task Force (IETF)                          A. Bader
Request for Comments: 5977                                   L. Westberg
Category: Experimental                                          Ericsson
ISSN: 2070-1721                                           G. Karagiannis
                                                    University of Twente
                                                              C. Kappler
                                                  ck technology concepts
                                                               T. Phelan
                                                                   Sonus
                                                            October 2010

              RMD-QOSM: The NSIS Quality-of-Service Model
                  for Resource Management in Diffserv

Abstract

   This document describes a Next Steps in Signaling (NSIS) Quality-of-
   Service (QoS) Model for networks that use the Resource Management in
   Diffserv (RMD) concept.  RMD is a technique for adding admission
   control and preemption function to Differentiated Services (Diffserv)
   networks.  The RMD QoS Model allows devices external to the RMD
   network to signal reservation requests to Edge nodes in the RMD
   network.  The RMD Ingress Edge nodes classify the incoming flows into
   traffic classes and signals resource requests for the corresponding
   traffic class along the data path to the Egress Edge nodes for each
   flow.  Egress nodes reconstitute the original requests and continue
   forwarding them along the data path towards the final destination.
   In addition, RMD defines notification functions to indicate overload
   situations within the domain to the Edge nodes.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5977.

Bader, et al.                 Experimental                      [Page 1]
RFC 5977                        RMD-QOSM                    October 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................6
   3. Overview of RMD and RMD-QOSM ....................................7
      3.1. RMD ........................................................7
      3.2. Basic Features of RMD-QOSM ................................10
           3.2.1. Role of the QNEs ...................................10
           3.2.2. RMD-QOSM/QoS-NSLP Signaling ........................11
           3.2.3. RMD-QOSM Applicability and Considerations ..........13
   4. RMD-QOSM, Detailed Description .................................15
      4.1. RMD-QSPEC Definition ......................................16
           4.1.1. RMD-QOSM <QoS Desired> and <QoS Reserved> ..........16
           4.1.2. PHR Container ......................................17
           4.1.3. PDR Container ......................................20
      4.2. Message Format ............................................23
      4.3. RMD Node State Management .................................23
           4.3.1. Aggregated Operational and Reservation
                  States at the QNE Edges ............................23
           4.3.2. Measurement-Based Method ...........................25
           4.3.3. Reservation-Based Method ...........................27
      4.4. Transport of RMD-QOSM Messages ............................28
      4.5. Edge Discovery and Message Addressing .....................31
      4.6. Operation and Sequence of Events ..........................32