Extension for Stateful PCE to allow Optional Processing of PCEP Objects.
draft-dhody-pce-stateful-pce-optional-04

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PCE Working Group                                                  C. Li
Internet-Draft                                                  H. Zheng
Updates: 8231 (if approved)                          Huawei Technologies
Intended status: Standards Track                            S. Litkowski
Expires: January 8, 2020                                          Orange
                                                            July 7, 2019

Extension for Stateful PCE to allow Optional Processing of PCEP Objects.
                draft-dhody-pce-stateful-pce-optional-04

Abstract

   This document introduces a mechanism to mark some Path Computation
   Element (PCE) Communication Protocol (PCEP) objects as optional
   during PCEP messages exchange for the Stateful PCE model to allow
   relaxing some constraints.

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Li, et al.               Expires January 8, 2020                [Page 1]
Internet-Draft                STATEFUL-OPT                     July 2019

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Usage Example . . . . . . . . . . . . . . . . . . . . . .   4
   3.  PCEP Extension  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  STATEFUL-PCE-CAPABILITY TLV . . . . . . . . . . . . . . .   4
     3.2.  Handling of P flag  . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  The PCRpt message . . . . . . . . . . . . . . . . . .   5
       3.2.2.  The PCUpd message and the PCInitiate message  . . . .   5
     3.3.  Handling of I flag  . . . . . . . . . . . . . . . . . . .   5
       3.3.1.  The PCUpd message . . . . . . . . . . . . . . . . . .   6
       3.3.2.  The PCRpt message . . . . . . . . . . . . . . . . . .   6
       3.3.3.  The PCInitiate message  . . . . . . . . . . . . . . .   6
     3.4.  Delegation  . . . . . . . . . . . . . . . . . . . . . . .   6
     3.5.  Unknown Object Handling . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  STATEFUL-PCE-CAPABILITY TLV . . . . . . . . . . . . . . .   7
   6.  Manageability Considerations  . . . . . . . . . . . . . . . .   7
     6.1.  Control of Function and Policy  . . . . . . . . . . . . .   7
     6.2.  Information and Data Models . . . . . . . . . . . . . . .   8
     6.3.  Liveness Detection and Monitoring . . . . . . . . . . . .   8
     6.4.  Verify Correct Operations . . . . . . . . . . . . . . . .   8
     6.5.  Requirements On Other Protocols . . . . . . . . . . . . .   8
     6.6.  Impact On Network Operations  . . . . . . . . . . . . . .   8
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Contributors . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   [RFC5440] describes the Path Computation Element communication
   Protocol (PCEP) which enables the communication between a Path
   Computation Client (PCC) and a Path Control Element (PCE), or between