LSP Object Flag Extension of Stateful PCE
draft-ietf-pce-lsp-extended-flags-00

Document Type Active Internet-Draft (pce WG)
Author Quan Xiong 
Last updated 2021-03-08
Replaces draft-xiong-pce-lsp-flag
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PCE                                                             Q. Xiong
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                           March 8, 2021
Expires: September 9, 2021

               LSP Object Flag Extension of Stateful PCE
                  draft-ietf-pce-lsp-extended-flags-00

Abstract

   RFC 8231 describes a set of extensions to Path Computation Element
   Communication Protocol (PCEP) to enable stateful control of MPLS-TE
   and GMPLS Label Switched Paths(LSPs) via PCEP.  One of the extensions
   is the LSP object which includes a Flag field of the length of 12
   bits.  However, 11 bits of the Flag field have already been assigned
   in RFC 8231, RFC 8281 and RFC 8623.

   This document proposes to define a new LSP-EXTENDED-FLAG TLV for the
   LSP object for an extended flag field.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on September 9, 2021.

Copyright Notice

   Copyright (c) 2021 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
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   (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

Xiong                   Expires September 9, 2021               [Page 1]
Internet-Draft  LSP Object Flag Extension of Stateful PCE     March 2021

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  PCEP Extension  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  The LSP-EXTENDED-FLAG TLV . . . . . . . . . . . . . . . .   3
     3.2.  Processing  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  LSP Object  . . . . . . . . . . . . . . . . . . . . . . .   4
       5.1.1.  PCEP TLV Type Indicators  . . . . . . . . . . . . . .   4
       5.1.2.  LSP Extended Flags Field  . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC5440] describes the Path Computation Element Protocol (PCEP)
   which is used between a Path Computation Element (PCE) and a Path
   Computation Client (PCC) (or other PCE) to enable computation of
   Multi-protocol Label Switching (MPLS) for Traffic Engineering Label
   Switched Path (TE LSP).

   PCEP Extensions for the Stateful PCE Model [RFC8231] describes a set
   of extensions to PCEP to enable active control of MPLS-TE and
   Generalized MPLS (GMPLS) tunnels.  One of the extensions is the LSP
   object which contains a flag field; bits in the flag field are used
   to indicate delegation, syncronization, removal, etc.

   As defined in [RFC8231], the length of the flag field is 12 bits and
   the value from bit 5 to bit 11 is used for operational,
   administrative, remove, synchronize and delegate bits respectively.
   The bit value 4 is assigned in [RFC8281] for create for PCE-Initiated
   LSPs.  The bits from 1 to 3 is assigned in [RFC8623] for Explicit
   Route Object (ERO)-compression, fragmentation and Point-to-Multipoint
   (P2MP) respectively.  Almost all bits of the Flag field has been
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