Hierarchical PCE Determination
draft-chen-pce-h-discovery-05

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05

PCE Working Group                                                H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                  M. Toy
Expires: January 8, 2020                                         Verizon
                                                                  X. Liu
                                                          Volta Networks
                                                                  L. Liu
                                                                 Fujitsu
                                                                   Z. Li
                                                            China Mobile
                                                            July 7, 2019

                     Hierarchical PCE Determination
                     draft-chen-pce-h-discovery-05

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.

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 January 8, 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

Chen, et al.             Expires January 8, 2020                [Page 1]
Internet-Draft             H-PCE-Determination                 July 2019

   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.

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,