Extension for Stateful PCE to allow Optional Processing of PCEP Objects
draft-dhody-pce-stateful-pce-optional-06

Document Type Active Internet-Draft (individual)
Authors Cheng Li  , Haomian Zheng  , Stephane Litkowski 
Last updated 2020-07-09
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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 10, 2021                                          Cisco
                                                           July 09, 2020

Extension for Stateful PCE to allow Optional Processing of PCEP Objects
                draft-dhody-pce-stateful-pce-optional-06

Abstract

   This document introduces a mechanism to mark some of the Path
   Computation Element (PCE) Communication Protocol (PCEP) objects as
   optional during PCEP messages exchange for the Stateful PCE model to
   allow relaxing some constraints.  This document introduces this
   relaxation and updates the RFC 8231.

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Li, et al.              Expires January 10, 2021                [Page 1]
Internet-Draft                STATEFUL-OPT                     July 2020

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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 . . . . . . . . . . . . . . . . . .   5
       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 . . . . . . . . . . . . . . .   7
     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
   two PCEs based on the PCE architecture [RFC4655].
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