S-PE Outage Protection for Static Multi-Segment Pseudowires
draft-ietf-pals-ms-pw-protection-01

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Document Type Active Internet-Draft (pals WG)
Last updated 2015-04-22
Replaces draft-shawam-pwe3-ms-pw-protection
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Network Working Group                                           A. Malis
Internet-Draft                                              L. Andersson
Updates: 6870 (if approved)                 Huawei Technologies Co., Ltd
Intended status: Standards Track                         H. van Helvoort
Expires: October 24, 2015                                 Hai Gaoming BV
                                                                 J. Shin
                                                              SK Telecom
                                                                 L. Wang
                                                            China Mobile
                                                         A. D'Alessandro
                                                          Telecom Italia
                                                          April 22, 2015

      S-PE Outage Protection for Static Multi-Segment Pseudowires
                draft-ietf-pals-ms-pw-protection-01.txt

Abstract

   In MPLS and MPLS-TP environments, statically provisioned Single-
   Segment Pseudowires (SS-PWs) are protected against tunnel failure via
   MPLS-level and MPLS-TP-level tunnel protection.  With statically
   provisioned Multi-Segment Pseudowires (MS-PWs), each segment of the
   MS-PW is likewise protected from tunnel failures via MPLS-level and
   MPLS-TP-level tunnel protection.  However, static MS-PWs are not
   protected end-to-end against failure of one of the switching PEs
   (S-PEs) along the path of the MS-PW.  This document describes how to
   achieve this protection via redundant MS-PWs by updating the existing
   procedures in RFC 6870.  It also contains an optional approach based
   on MPLS-TP Linear Protection.

Status of This Memo

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   This Internet-Draft will expire on October 24, 2015.

Malis, et al.           Expires October 24, 2015                [Page 1]
Internet-Draft              MS-PW Protection                  April 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Extension to RFC 6870 to Protect Statically Provisioned SS-
       PWs and MS-PWs  . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Operational Considerations  . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Optional Linear Protection Approach  . . . . . . . .   6
     A.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   6
     A.2.  Encapsulation of the PSC Protocol for Pseudowires . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   As described in RFC 5659 [RFC5659], Multi-Segment Pseudowires (MS-
   PWs) consist of terminating PEs (T-PEs), one or more switching PEs
   (S-PEs), and a sequence of PW segments that connects one of the T-PEs
   with its "adjacent" S-PE, connects this S-PE with the next S-PE in
   the sequence and so on until the last S-PE is connected by the last
   PW segment to the remaining T-PE.  In MPLS and MPLS-TP environments,
   statically provisioned Single-Segment Pseudowires (SS-PWs) are
   protected against tunnel failure via MPLS-level and MPLS-TP-level
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