Hierarchical PCE Determination
draft-chen-pce-h-discovery-06

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PCE Working Group                                                H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                  M. Toy
Expires: July 9, 2020                                            Verizon
                                                                  X. Liu
                                                          Volta Networks
                                                                  L. Liu
                                                                 Fujitsu
                                                                   Z. Li
                                                            China Mobile
                                                         January 6, 2020

                     Hierarchical PCE Determination
                     draft-chen-pce-h-discovery-06

Abstract

   This document presents extensions to the Path Computation Element
   Communication Protocol (PCEP) for determining parent child relations
   and exchanging the information between a parent and a child PCE in a
   hierarchical PCE system.

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   This Internet-Draft will expire on July 9, 2020.

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   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

Chen, et al.              Expires July 9, 2020                  [Page 1]
Internet-Draft             H-PCE-Determination              January 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   4.  Extensions to PCEP  . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Determination of Parent Child Relation  . . . . . . . . .   4
     4.2.  Sub-TLVs  . . . . . . . . . . . . . . . . . . . . . . . .   5
       4.2.1.  Domain Sub-TLV  . . . . . . . . . . . . . . . . . . .   5
       4.2.2.  PCE ID Sub-TLV  . . . . . . . . . . . . . . . . . . .   6
     4.3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   A hierarchical PCE architecture is described in RFC 6805, in which a
   parent PCE has a number of child PCEs.  A child PCE may also be a
   parent PCE, which has multiple child PCEs.

   For a parent PCE, it needs to obtain the information about each of
   its child PCEs.  The information about a child PCE comprises the
   address or ID of the PCE and the domain for which the PCE is
   responsible.  It may also include the position of the PCE, which
   indicates whether the PCE is a leaf (i.e., only a child) or branch
   (i.e., a child and also a parent).  In addition, the information may
   indicate whether the child PCE and its responsible domain is in a
   same organization as the parent PCE.

   For a child PCE, it needs to obtain the information about its parent
   PCE, which includes the address or ID of the parent PCE.  The
   information may also indicate whether the parent PCE is in a same
   organization as the child PCE.

   After a user configures a parent PCE and a child PCE over a session,
   this parent child PCE relation needs to be determined in the protocol