Dual-Homing Protection for MPLS and MPLS-TP Pseudowires
draft-ietf-pals-mpls-tp-dual-homing-protection-05

Document Type Active Internet-Draft (pals WG)
Last updated 2017-03-02 (latest revision 2017-01-20)
Replaces draft-cheng-pwe3-mpls-tp-dual-homing-protection
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Intended RFC status Informational
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Network Working Group                                           W. Cheng
Internet-Draft                                                   L. Wang
Intended status: Informational                                     H. Li
Expires: July 21, 2017                                      China Mobile
                                                               S. Davari
                                                    Broadcom Corporation
                                                                 J. Dong
                                                     Huawei Technologies
                                                        January 17, 2017

        Dual-Homing Protection for MPLS and MPLS-TP Pseudowires
           draft-ietf-pals-mpls-tp-dual-homing-protection-05

Abstract

   This document describes a framework and several scenarios for a
   Pseudowire (PW) dual-homing local protection mechanism which avoids
   unnecessary switchovers and which can be used for scenarios using a
   control plane or not using a control plane.  A Dual-Node
   Interconnection (DNI) PW is used for carrying traffic between the
   dual-homing Provider Edge (PE) nodes for carrying traffic 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

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   This Internet-Draft will expire on July 21, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Cheng, et al.             Expires July 21, 2017                 [Page 1]
Internet-Draft          Dual-Homing PW Protection           January 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Reference Models of Dual-homing Local Protection  . . . . . .   3
     2.1.  PE Architecture . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Dual-Homing Local Protection Reference Scenarios  . . . .   4
       2.2.1.  One-Side Dual-Homing Protection . . . . . . . . . . .   4
       2.2.2.  Two-side Dual-Homing Protection . . . . . . . . . . .   6
   3.  Generic Dual-homing PW Protection Mechanism . . . . . . . . .   8
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   [RFC6372] and [RFC6378] describe the framework and mechanism of MPLS-
   TP Linear protection, which can provide protection for the MPLS LSP
   or pseudowire (PW) between the edge nodes.  This mechanism does not
   protect the 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 for AC or PE node
   failure.  The PW redundancy mechanism is based on the signaling of
   Label Distribution Protocol (LDP), which is applicable to PWs with a
   dynamic control plane.  [I-D.ietf-pals-endpoint-fast-protection]
   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.  This mechanism is only
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