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High Availability within a Forwarding and Control Element Separation (ForCES) Network Element
RFC 7121

Document type: RFC - Proposed Standard (February 2014)
Updates RFC 5810
Document stream: IETF
Last updated: 2014-02-11
Other versions: plain text, pdf, html

IETF State: WG Document
Consensus: Yes
Document shepherd: Bhumip Khasnabish
Shepherd Write-Up: Last changed 2013-11-26

IESG State: RFC 7121 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Adrian Farrel
Send notices to: forces-chairs@tools.ietf.org, draft-ietf-forces-ceha@tools.ietf.org

Internet Engineering Task Force (IETF)                          K. Ogawa
Request for Comments: 7121                               NTT Corporation
Updates: 5810                                                    W. Wang
Category: Standards Track                  Zhejiang Gongshang University
ISSN: 2070-1721                                            E. Haleplidis
                                                    University of Patras
                                                           J. Hadi Salim
                                                       Mojatatu Networks
                                                           February 2014

                       High Availability within a
   Forwarding and Control Element Separation (ForCES) Network Element

Abstract

   This document discusses Control Element (CE) High Availability (HA)
   within a Forwarding and Control Element Separation (ForCES) Network
   Element (NE).  Additionally, this document updates RFC 5810 by
   providing new normative text for the Cold Standby High Availability
   mechanism.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7121.

Ogawa, et al.                Standards Track                    [Page 1]
RFC 7121            ForCES Intra-NE High Availability      February 2014

Copyright Notice

   Copyright (c) 2014 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
   (http://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
   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Quantifying Problem Scope . . . . . . . . . . . . . . . .   4
     1.2.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  RFC 5810 CE HA Framework  . . . . . . . . . . . . . . . . . .   7
     2.1.  RFC 5810 CE HA Support  . . . . . . . . . . . . . . . . .   7
       2.1.1.  Cold Standby Interaction with the ForCES Protocol . .   8
       2.1.2.  Responsibilities for HA . . . . . . . . . . . . . . .  10
   3.  CE HA Hot Standby . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Changes to the FEPO Model . . . . . . . . . . . . . . . .  11
     3.2.  FEPO Processing . . . . . . . . . . . . . . . . . . . . .  13
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   Appendix A.  New FEPO Version . . . . . . . . . . . . . . . . . .  20

Ogawa, et al.                Standards Track                    [Page 2]
RFC 7121            ForCES Intra-NE High Availability      February 2014

1.  Introduction

   Figure 1 illustrates a ForCES Network Element (NE) controlled by a
   set of redundant Control Elements (CEs) with CE1 being active and CE2
   and CEn being backups.

                           -----------------------------------------
                           | ForCES Network Element                |
                           |                        +-----------+  |
                           |                        |  CEn      |  |
                           |                        |  (Backup) |  |
     --------------   Fc   | +------------+      +------------+ |  |
     | CE Manager |--------+-|     CE1    |------|    CE2     |-+  |
     --------------        | |  (Active)  |  Fr  |  (Backup)  |    |
           |               | +-------+--+-+      +---+---+----+    |
           | Fl            |         |  |    Fp      /   |         |
           |               |         |  +---------+ /    |         |

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