BGP for Network High Availability
draft-chen-idr-ctr-availability-01

Document Type Active Internet-Draft (individual)
Authors Huaimo Chen  , Yanhe Fan  , Aijun Wang  , Lei Liu  , Xufeng Liu 
Last updated 2020-09-09
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Network Working Group                                            H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                  Y. Fan
Expires: March 13, 2021                                     Casa Systems
                                                                 A. Wang
                                                           China Telecom
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                       September 9, 2020

                   BGP for Network High Availability
                   draft-chen-idr-ctr-availability-01

Abstract

   This document describes protocol extensions to BGP 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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   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 March 13, 2021.

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Copyright Notice

   Copyright (c) 2020 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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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.  BGP for Controller Cluster Reliability  . . . . . . . . . . .   3
     3.1.  Overview of Mechanism . . . . . . . . . . . . . . . . . .   3
     3.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Extensions to BGP . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Capability  . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Controller NLRI . . . . . . . . . . . . . . . . . . . . .   7
   5.  Recovery Procedure  . . . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

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

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   the cluster may split the cluster into a few of separated controller
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