Pseudowire (PW) Control Word (CW) Stitching
draft-busi-pals-pw-cw-stitching-01

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Last updated 2018-10-22
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PALS Working Group                                           Italo Busi
Internet Draft                                           Stewart Bryant
Intended status: Standard Track                         Andrew G. Malis
Expires: April 2019                                            Jie Dong
                                                                 Huawei

                                                       October 22, 2018

                Pseudowire (PW) Control Word (CW) Stitching
                  draft-busi-pals-pw-cw-stitching-01.txt

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   document must include Simplified BSD License text as described in
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Abstract

   This document defines the behavior of a new type of Multi-Segment
   Pseudowire (MS-PW) Switching PE (S-PE) which enhances the S-PE
   functions defined in [RFC 6073], with the capability to switch an
   Ethernet pseudowire (PW) segment that uses the PW Control Word (CW)
   [RFC 4385] with an Ethernet PW segment that does not use the CW.

   This new type of S-PE can be deployed in the network one hop away,
   at the MPLS layer, from a Terminating PE (T-PE) which does not
   support CW for Ethernet PW encapsulation [RFC 4448]. In this way,
   all the Ethernet PW packets sent though the MPLS network will have
   the CW and be protected against incorrect equal-cost-multi-path
   (ECMP) behavior as described in [I-D ETH-CW].

Table of Contents

   1. Introduction...................................................2
      1.1. Assumptions...............................................5
   2. Terminology....................................................5
      2.1. Conventions Used in This Document.........................6
   3. Control Word Stitching procedures..............................6
      3.1. CW Stitching Signaling....................................7
   4. VCCV Stitching Procedures......................................8
      4.1. VCCV Stitching for CC Type 3..............................9
      4.2. VCCV Stitching for CC Type 4.............................10
      4.3. VCCV Stitching Signaling.................................12
   5. Other Deployment Scenarios....................................13
   6. Security Considerations.......................................15
   7. IANA Considerations...........................................16
   8. References....................................................16
      8.1. Normative References.....................................16
      8.2. Informative References...................................16
   9. Acknowledgments...............................................17

1. Introduction

   In order to protect Ethernet pseudowire (PW) packets against
   incorrect equal-cost-multi-path (ECMP) behavior, which may cause
   out-of-order delivery of the payload Ethernet frames, the use of PW
   control word (CW) has been recommended in [I-D ETH-CW].

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   There are cases where service providers have existing deployments
   where the Provider Edge (PE) device is an old piece of equipment
   which does not support the CW for Ethernet PW encapsulation. In this
   case, the CW shall not be used as defined in [RFC 4448].
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