Framework for Scheduled Use of Resources
RFC 8413

Document Type RFC - Informational (July 2018; No errata)
Last updated 2018-07-09
Replaces draft-zhuang-teas-scheduled-resources
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Vishnu Beeram
Shepherd write-up Show (last changed 2017-12-03)
IESG IESG state RFC 8413 (Informational)
Consensus Boilerplate Yes
Telechat date
Responsible AD Deborah Brungard
Send notices to Vishnu Beeram <vbeeram@juniper.net>
IANA IANA review state IANA OK - No Actions Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                         Y. Zhuang
Request for Comments: 8413                                         Q. Wu
Category: Informational                                          H. Chen
ISSN: 2070-1721                                                   Huawei
                                                               A. Farrel
                                                        Juniper Networks
                                                               July 2018

                Framework for Scheduled Use of Resources

Abstract

   Time-Scheduled (TS) reservation of Traffic Engineering (TE) resources
   can be used to provide resource booking for TE Label Switched Paths
   so as to better guarantee services for customers and to improve the
   efficiency of network resource usage at any moment in time, including
   network usage that is planned for the future.  This document provides
   a framework that describes and discusses the architecture for
   supporting scheduled reservation of TE resources.  This document does
   not describe specific protocols or protocol extensions needed to
   realize this service.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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 candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8413.

Zhuang, et al.                Informational                     [Page 1]
RFC 8413               Scheduled Use of Resources              July 2018

Copyright Notice

   Copyright (c) 2018 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Provisioning TE-LSPs and TE Resources . . . . . . . . . .   4
     2.2.  Selecting the Path of an LSP  . . . . . . . . . . . . . .   4
     2.3.  Planning Future LSPs  . . . . . . . . . . . . . . . . . .   5
     2.4.  Looking at Future Demands on TE Resources . . . . . . . .   6
       2.4.1.  Interaction between Time-Scheduled and Ad Hoc
               Reservations  . . . . . . . . . . . . . . . . . . . .   6
     2.5.  Requisite State Information . . . . . . . . . . . . . . .   7
   3.  Architectural Concepts  . . . . . . . . . . . . . . . . . . .   8
     3.1.  Where is Scheduling State Held? . . . . . . . . . . . . .   8
     3.2.  What State is Held? . . . . . . . . . . . . . . . . . . .  10
     3.3.  Enforcement of Operator Policy  . . . . . . . . . . . . .  12
   4.  Architecture Overview . . . . . . . . . . . . . . . . . . . .  13
     4.1.  Service Request . . . . . . . . . . . . . . . . . . . . .  13
       4.1.1.  Reoptimization After TED Updates  . . . . . . . . . .  14
     4.2.  Initialization and Recovery . . . . . . . . . . . . . . .  15
     4.3.  Synchronization Between PCEs  . . . . . . . . . . . . . .  15
   5.  Multi-domain Considerations . . . . . . . . . . . . . . . . .  16
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   8.  Informative References  . . . . . . . . . . . . . . . . . . .  19
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  21
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

Zhuang, et al.                Informational                     [Page 2]
RFC 8413               Scheduled Use of Resources              July 2018

1.  Introduction

   Traffic Engineering Label Switched Paths (TE-LSPs) are connection-
   oriented tunnels in packet and non-packet networks [RFC3209]
   [RFC3945].  TE-LSPs may reserve network resources for use by the
   traffic they carry, thus providing some guarantees of service
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