NSIS Signaling Layer Protocol (NSLP) for Quality-of-Service Signaling
RFC 5974

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Internet Engineering Task Force (IETF)                         J. Manner
Request for Comments: 5974                              Aalto University
Category: Experimental                                    G. Karagiannis
ISSN: 2070-1721                            University of Twente/Ericsson
                                                             A. McDonald
                                                                    Roke
                                                            October 2010

 NSIS Signaling Layer Protocol (NSLP) for Quality-of-Service Signaling

Abstract

   This specification describes the NSIS Signaling Layer Protocol (NSLP)
   for signaling Quality of Service (QoS) reservations in the Internet.
   It is in accordance with the framework and requirements developed in
   NSIS.  Together with General Internet Signaling Transport (GIST), it
   provides functionality similar to RSVP and extends it.  The QoS NSLP
   is independent of the underlying QoS specification or architecture
   and provides support for different reservation models.  It is
   simplified by the elimination of support for multicast flows.  This
   specification explains the overall protocol approach, describes the
   design decisions made, and provides examples.  It specifies object,
   message formats, and processing rules.

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/rfc5974.

Manner, et al.                Experimental                      [Page 1]
RFC 5974                        QoS NSLP                    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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Protocol Overview  . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Overall Approach . . . . . . . . . . . . . . . . . . . . .  6
       3.1.1.  Protocol Messages  . . . . . . . . . . . . . . . . . .  9
       3.1.2.  QoS Models and QoS Specifications  . . . . . . . . . . 10
       3.1.3.  Policy Control . . . . . . . . . . . . . . . . . . . . 12
     3.2.  Design Background  . . . . . . . . . . . . . . . . . . . . 13
       3.2.1.  Soft States  . . . . . . . . . . . . . . . . . . . . . 13
       3.2.2.  Sender and Receiver Initiation . . . . . . . . . . . . 13
       3.2.3.  Protection against Message Re-ordering and
               Duplication  . . . . . . . . . . . . . . . . . . . . . 14
       3.2.4.  Explicit Confirmations . . . . . . . . . . . . . . . . 14
       3.2.5.  Reduced Refreshes  . . . . . . . . . . . . . . . . . . 14
       3.2.6.  Summary Refreshes and Summary Tear . . . . . . . . . . 15
       3.2.7.  Message Scoping  . . . . . . . . . . . . . . . . . . . 15
       3.2.8.  Session Binding  . . . . . . . . . . . . . . . . . . . 16
       3.2.9.  Message Binding  . . . . . . . . . . . . . . . . . . . 16
       3.2.10. Layering . . . . . . . . . . . . . . . . . . . . . . . 17
       3.2.11. Support for Request Priorities . . . . . . . . . . . . 18
       3.2.12. Rerouting  . . . . . . . . . . . . . . . . . . . . . . 19
       3.2.13. Preemption . . . . . . . . . . . . . . . . . . . . . . 24
     3.3.  GIST Interactions  . . . . . . . . . . . . . . . . . . . . 24
       3.3.1.  Support for Bypassing Intermediate Nodes . . . . . . . 25
       3.3.2.  Support for Peer Change Identification . . . . . . . . 25
       3.3.3.  Support for Stateless Operation  . . . . . . . . . . . 26
       3.3.4.  Priority of Signaling Messages . . . . . . . . . . . . 26
       3.3.5.  Knowledge of Intermediate QoS-NSLP-Unaware Nodes . . . 26