Dual-Homing Coordination for MPLS Transport Profile (MPLS-TP) Pseudowires Protection
RFC 8185

Document Type RFC - Proposed Standard (June 2017; No errata)
Last updated 2017-06-26
Replaces draft-cheng-pwe3-mpls-tp-dual-homing-coordination
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IESG IESG state RFC 8185 (Proposed Standard)
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Internet Engineering Task Force (IETF)                          W. Cheng
Request for Comments: 8185                                       L. Wang
Category: Standards Track                                          H. Li
ISSN: 2070-1721                                             China Mobile
                                                                 J. Dong
                                                     Huawei Technologies
                                                         A. D'Alessandro
                                                          Telecom Italia
                                                               June 2017

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

Abstract

   In some scenarios, MPLS Transport Profile (MPLS-TP) pseudowires (PWs)
   (RFC 5921) may be statically configured when a dynamic control plane
   is not available.  A fast protection mechanism for MPLS-TP PWs is
   needed to protect against the failure of an Attachment Circuit (AC),
   the failure of a Provider Edge (PE), or a failure in the Packet
   Switched Network (PSN).  The framework and typical scenarios of dual-
   homing PW local protection are described in RFC 8184.  This document
   proposes a dual-homing coordination mechanism for MPLS-TP PWs that is
   used for state exchange and switchover coordination between the dual-
   homing PEs for dual-homing PW local protection.

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 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/rfc8185.

Cheng, et al.                Standards Track                    [Page 1]
RFC 8185        Dual-Homing Coordination for MPLS-TP PWs       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.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview of the Proposed Solution . . . . . . . . . . . . . .   4
   4.  Protocol Extensions for Dual-Homing MPLS-TP PW Protection . .   5
     4.1.  Information Exchange Between Dual-Homing PEs  . . . . . .   5
     4.2.  Protection Procedures . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

Cheng, et al.                Standards Track                    [Page 2]
RFC 8185        Dual-Homing Coordination for MPLS-TP PWs       June 2017

1.  Introduction

   [RFC6372], [RFC6378], and [RFC7771] describe the framework and
   mechanism of MPLS Transport Profile (MPLS-TP) linear protection,
   which can provide protection for the MPLS Label Switched Path (LSP)
   and pseudowires (PWs) between the edge nodes.  These mechanisms
   cannot protect against the failure of the Attachment Circuit (AC) or
   the edge nodes.  [RFC6718] and [RFC6870] specify the PW redundancy
   framework and mechanism for protecting the AC or edge node against
   failure by adding one or more edge nodes, but it requires PW
   switchover in case of an AC failure; also, PW redundancy relies on
   Packet Switched Network (PSN) protection mechanisms to protect
   against the failure of PW.

   In some scenarios such as mobile backhauling, the MPLS PWs are
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