Updated Rules for Processing Stateful PCE Request Parameters Flags
draft-ietf-pce-stateful-flags-00

Document Type Active Internet-Draft (pce WG)
Last updated 2019-11-07
Replaces draft-farrel-pce-stateful-flags
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PCE Working Group                                              A. Farrel
Internet-Draft                                        Old Dog Consulting
Updates: 8231 (if approved)                             November 7, 2019
Intended status: Standards Track
Expires: May 10, 2020

   Updated Rules for Processing Stateful PCE Request Parameters Flags
                    draft-ietf-pce-stateful-flags-00

Abstract

   Extensions to the Path Computation Element Communication Protocol
   (PCEP) to support stateful Path Computation Elements (PCEs) are
   defined in RFC 8231.  One of the extensions is the Stateful PCE
   Request Parameters (SRP) object.  That object includes a Flags field
   that is a set of 32 bit flags, and RFC 8281 defines an IANA registry
   for tracking assigned flags.  However, RFC 8231 does not explain how
   an implementation should set unassigned flags in transmitted
   messages, nor how an implementation should process unassigned,
   unknown, or unsupported flags in received messages.

   This document updates RFC 8231 by defining the correct behaviors.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 10, 2020.

Copyright Notice

   Copyright (c) 2019 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

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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Updated Procedures  . . . . . . . . . . . . . . . . . . . . .   3
   4.  Compatibility Considerations  . . . . . . . . . . . . . . . .   3
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   4
   6.  Management Considerations . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   5
     10.2.  Informative References . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC5440] describes the Path Computation Element Communication
   Protocol (PCEP).  PCEP defines the communication between a Path
   Computation Client (PCC) and a Path Computation Element (PCE), or
   between PCEs, enabling computation of Multiprotocol Label Switching
   (MPLS) for Traffic Engineering Label Switched Path (TE LSP)
   characteristics.

   [RFC8231] specifies a set of extensions to PCEP to enable stateful
   control of LSPs within and across PCEP sessions in compliance with
   [RFC4657].  It includes mechanisms to effect Label Switched Path
   (LSP) State Synchronization between PCCs and PCEs, delegation of
   control over LSPs to PCEs, and PCE control of timing and sequence of
   path computations within and across PCEP sessions.

   One of the extensions defined in [RFC8231] is the Stateful PCE
   Request Parameters (SRP) object.  That object includes a Flags field
   that is a set of 32 bit flags, and RFC 8281 defines an IANA registry
   for tracking assigned flags.  However, RFC 8231 does not explain how
   an implementation should set unassigned flags in transmitted
   messages, nor how an implementation should process unassigned or
   unknown flags in received messages.

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