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

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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.

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

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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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