PCEP Extension for SR-MPLS Entropy Label Position
draft-peng-pce-entropy-label-position-01

Document Type Active Internet-Draft (individual)
Last updated 2019-09-12
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
PCE                                                              S. Peng
Internet-Draft                                                  Q. Xiong
Intended status: Standards Track                         ZTE Corporation
Expires: March 14, 2020                               September 11, 2019

           PCEP Extension for SR-MPLS Entropy Label Position
                draft-peng-pce-entropy-label-position-01

Abstract

   This document proposes a set of extensions for PCEP to configure the
   entropy label position for SR-MPLS networks.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 14, 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
   (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
   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.

Peng & Xiong             Expires March 14, 2020                 [Page 1]
Internet-DraftPCEP Extension for SR-MPLS Entropy Label PosSeptember 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  The LSP Object  . . . . . . . . . . . . . . . . . . . . .   4
       3.2.1.  The LSP-EXTENDED-FLAG TLV . . . . . . . . . . . . . .   5
     3.3.  The ERO Object  . . . . . . . . . . . . . . . . . . . . .   5
   4.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  New SR PCE Capability Flag Registry . . . . . . . . . . .   6
     7.2.  New LSP Flag Registry . . . . . . . . . . . . . . . . . .   6
     7.3.  New SR-ERO Flag Registry  . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

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.  [RFC8281]
   describes the setup and teardown of PCE-initiated LSPs under the
   active stateful PCE model, without the need for local configuration
   on the PCC, thus allowing for dynamic centralized control of a
   network.

   Segment Routing (SR) leverages the source routing paradigm.  Segment
   Routing can be instantiated on MPLS data plane which is referred to
   as SR-MPLS [I-D.ietf-spring-segment-routing-mpls].  SR-MPLS leverages
   the MPLS label stack to construct the SR path.  PCEP Extensions for
   Segment Routing [I-D.ietf-pce-segment-routing] specifies extensions
   to the PCEP that allow a stateful PCE to compute and initiate TE
   paths, as well as a PCC to request a path subject to certain
   constraint(s) and optimization criteria in SR networks.

   Entropy label (EL) [RFC6790] is a technique used in the MPLS data
   plane to provide entropy for load-balancing.  Entropy Label Indicator
   (ELI) can be immediately preceding an EL in the MPLS label stack.
   The idea behind the EL is that the ingress router computes a hash
Show full document text