Extension for Stateful PCE to allow Optional Processing of PCEP Objects
draft-dhody-pce-stateful-pce-optional-05

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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: July 14, 2020                                             Cisco
                                                        January 11, 2020

Extension for Stateful PCE to allow Optional Processing of PCEP Objects
                draft-dhody-pce-stateful-pce-optional-05

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.  The introduction of relaxation in
   this document updates RFC8231.

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   This Internet-Draft will expire on July 14, 2020.

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Li, et al.                Expires July 14, 2020                 [Page 1]
Internet-Draft                STATEFUL-OPT                  January 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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