Dual-Homing Protection for MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires
RFC 8184

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Internet Engineering Task Force (IETF)                          W. Cheng
Request for Comments: 8184                                       L. Wang
Category: Informational                                            H. Li
ISSN: 2070-1721                                             China Mobile
                                                               S. Davari
                                                    Broadcom Corporation
                                                                 J. Dong
                                                     Huawei Technologies
                                                               June 2017

                       Dual-Homing Protection for
       MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires

Abstract

   This document describes a framework and several scenarios for a
   pseudowire (PW) dual-homing local protection mechanism that avoids
   unnecessary switchovers and does not depend on whether a control
   plane is used.  A Dual-Node Interconnection (DNI) PW is used to carry
   traffic between the dual-homing Provider Edge (PE) nodes when a
   failure occurs in one of the Attachment Circuits (AC) or PWs.  This
   PW dual-homing local protection mechanism is complementary to
   existing PW protection mechanisms.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 7841.

   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/rfc8184.

Cheng, et al.                 Informational                     [Page 1]
RFC 8184                Dual-Homing PW Protection              June 2017

Copyright Notice

   Copyright (c) 2017 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
   2.  Reference Models of Dual-Homing Local Protection  . . . . . .   4
     2.1.  PE Architecture . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Dual-Homing Local Protection Reference Scenarios  . . . .   5
       2.2.1.  One-Side Dual-Homing Protection . . . . . . . . . . .   5
       2.2.2.  Two-Side Dual-Homing Protection . . . . . . . . . . .   6
   3.  Generic Dual-Homing PW Protection Mechanism . . . . . . . . .   8
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

Cheng, et al.                 Informational                     [Page 2]
RFC 8184                Dual-Homing PW Protection              June 2017

1.  Introduction

   [RFC6372] and [RFC6378] describe the framework and mechanism of MPLS
   Transport Profile (MPLS-TP) linear protection, which can provide
   protection for the MPLS Label Switched Path (LSP) or pseudowire (PW)
   between the edge nodes.  This mechanism does not protect against
   failure of the Attachment Circuit (AC) or the Provider Edge (PE)
   node.  [RFC6718] and [RFC6870] describe the framework and mechanism
   for PW redundancy to provide protection against AC or PE node
   failure.  The PW redundancy mechanism is based on the signaling of
   the Label Distribution Protocol (LDP), which is applicable to PWs
   with a dynamic control plane.  [RFC8104] describes a fast local
   repair mechanism for PW egress endpoint failures, which is based on
   PW redundancy, upstream label assignment, and context-specific label
   switching.  The mechanism defined in [RFC8104] is only applicable to
   PWs with a dynamic control plane.