Hierarchical Stateful Path Computation Element (PCE).
draft-ietf-pce-stateful-hpce-11

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PCE Working Group                                               D. Dhody
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                    Y. Lee
Expires: January 9, 2020                          Futurewei Technologies
                                                           D. Ceccarelli
                                                                Ericsson
                                                                 J. Shin
                                                              SK Telecom
                                                                 D. King
                                                    Lancaster University
                                                            July 8, 2019

         Hierarchical Stateful Path Computation Element (PCE).
                    draft-ietf-pce-stateful-hpce-11

Abstract

   A Stateful Path Computation Element (PCE) maintains information on
   the current network state, including: computed Label Switched Path
   (LSPs), reserved resources within the network, and pending path
   computation requests. This information may then be considered when
   computing new traffic engineered LSPs, and for associated and
   dependent LSPs, received from Path Computation Clients (PCCs). The
   Path computation response from a PCE is helpful for the PCC to
   gracefully establish the computed LSP.

   The Hierarchical Path Computation Element (H-PCE) architecture,
   provides an architecture to allow the optimum sequence of
   inter-connected domains to be selected, and network policy to be
   applied if applicable, via the use of a hierarchical relationship
   between PCEs.

   Combining the capabilities of Stateful PCE and the Hierarchical PCE
   would be advantageous. This document describes general considerations
   and use cases for the deployment of Stateful, and not Stateless, PCEs
   using the Hierarchical PCE architecture.

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
 

Dhody, et al.             Expires January 2020                  [Page 1]
Internet-Draft               STATEFUL-HPCE                     July 2019

   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 December 18, 2019.

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Background . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Use-cases and Applicability of Hierarchical Stateful PCE .  4
       1.2.1.  Applicability to ACTN  . . . . . . . . . . . . . . . .  5
       1.2.2.  End-to-End Contiguous LSP  . . . . . . . . . . . . . .  5
       1.2.3.  Applicability of a Stateful P-PCE  . . . . . . . . . .  6
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  7
   3.  Hierarchical Stateful PCE  . . . . . . . . . . . . . . . . . .  8
     3.1.  Passive Operations . . . . . . . . . . . . . . . . . . . .  9
     3.2.  Active Operations  . . . . . . . . . . . . . . . . . . . . 11
     3.3.  PCE Initiation of LSPs . . . . . . . . . . . . . . . . . . 12
       3.3.1.  Per Domain Stitched LSP  . . . . . . . . . . . . . . . 13
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   5.  Manageability Considerations . . . . . . . . . . . . . . . . . 16
     5.1.  Control of Function and Policy . . . . . . . . . . . . . . 16
     5.2.  Information and Data Models  . . . . . . . . . . . . . . . 16
     5.3.  Liveness Detection and Monitoring  . . . . . . . . . . . . 16
     5.4.  Verify Correct Operations  . . . . . . . . . . . . . . . . 16