Switching Provider Edge (S-PE) Protection for MPLS and MPLS Transport Profile (MPLS-TP) Static Multi-Segment Pseudowires
RFC 7771

Document Type RFC - Proposed Standard (January 2016; No errata)
Updates RFC 6870
Last updated 2016-01-29
Replaces draft-shawam-pwe3-ms-pw-protection
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Stewart Bryant
Shepherd write-up Show (last changed 2015-06-16)
IESG IESG state RFC 7771 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Deborah Brungard
Send notices to draft-ietf-pals-ms-pw-protection.all@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                     A. Malis, Ed.
Request for Comments: 7771                                  L. Andersson
Updates: 6870                              Huawei Technologies Co., Ltd.
Category: Standards Track                                H. van Helvoort
ISSN: 2070-1721                                           Hai Gaoming BV
                                                                 J. Shin
                                                              SK Telecom
                                                                 L. Wang
                                                            China Mobile
                                                         A. D'Alessandro
                                                          Telecom Italia
                                                            January 2016

 Switching Provider Edge (S-PE) Protection for MPLS and MPLS Transport
           Profile (MPLS-TP) Static Multi-Segment Pseudowires

Abstract

   In MPLS and MPLS Transport Profile (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 Provider Edge Routers (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

   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/rfc7771.

Malis, et al.                Standards Track                    [Page 1]
RFC 7771                    MS-PW Protection                January 2016

Copyright Notice

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   document authors.  All rights reserved.

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   described in the Simplified BSD License.

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.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Optional Linear Protection Approach  . . . . . . . .   7
     A.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   7
     A.2.  Encapsulation of the PSC Protocol for Pseudowires . . . .   8
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   In MPLS and MPLS Transport Profile (MPLS-TP) Packet Switched Networks
   (PSNs), pseudowires (PWs) are transported by MPLS(-TP) Label Switched
   Paths (LSPs), also known as tunnels.

   As described in RFC 5659 [RFC5659], Multi-Segment Pseudowires (MS-
   PWs) consist of Terminating Provider Edge Routers PEs (T-PEs), one or
   more Switching Provider Edge Routers (S-PEs), and a sequence of
   tunneled 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
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