PCE for Network High Availability
draft-chen-pce-ctr-availability-01

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Network Working Group                                            H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                 A. Wang
Expires: March 13, 2021                                    China Telecom
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                       September 9, 2020

                   PCE for Network High Availability
                   draft-chen-pce-ctr-availability-01

Abstract

   This document describes extensions to Path Computation Element (PCE)
   communication Protocol (PCEP) for improving the reliability or
   availability of a network controlled by a controller cluster.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 13, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft             PCE for Network HA             September 2020

   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
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   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.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PCE for Controller Cluster Reliability  . . . . . . . . . . .   3
     3.1.  Overview of Mechanism . . . . . . . . . . . . . . . . . .   3
     3.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Extensions to PCEP  . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Capability  . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Controllers Object  . . . . . . . . . . . . . . . . . . .   7
   5.  Recovery Procedure  . . . . . . . . . . . . . . . . . . . . .  10
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   More and more networks are controlled by central controllers or
   controller clusters.  A controller cluster is a single controller
   externally.  It normally consists of two or more controllers
   internally working together as a single controller externally to
   control a network, i.e., every network element (NE) in the network.
   The reliability or availability of a network is heavily dependent on
   its controller cluster.  The issues or failures in the controller
   cluster may impact the reliability or availability of the network
   greatly.

   For a controller cluster comprising two or more controllers (i.e.,
   primary controller, secondary controller, and so on), the failures in
   the cluster may split the cluster into a few of separated controller
   groups.  These groups do not know each other and may be out of
   synchronization.  Two or more groups may be elected as primary groups
   to control the network at the same time, which may cause some issues.

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