Multi-Segment Pseudowires in Passive Optical Networks
RFC 6456

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Internet Engineering Task Force (IETF)                             H. Li
Request for Comments: 6456                                      R. Zheng
Category: Informational                              Huawei Technologies
ISSN: 2070-1721                                                A. Farrel
                                                      Old Dog Consulting
                                                           November 2011

         Multi-Segment Pseudowires in Passive Optical Networks

Abstract

   This document describes the application of MPLS multi-segment
   pseudowires (MS-PWs) in a dual-technology environment comprising a
   Passive Optical Network (PON) and an MPLS Packet Switched Network
   (PSN).

   PON technology may be used in mobile backhaul networks to support the
   end segments closest to the aggregation devices.  In these cases,
   there may be a very large number of pseudowire (PW) Terminating
   Provider Edge (T-PE) nodes.  The MPLS control plane could be used to
   provision these end segments, but support for the necessary protocols
   would complicate the management of the T-PEs and would significantly
   increase their expense.  Alternatively, static, or management plane,
   configuration could be used to configure the end segments, but the
   very large number of such segments in a PON places a very heavy
   burden on the network manager.

   This document describes how to set up the end segment of an end-to-
   end MPLS PW over a Gigabit-capable Passive Optical Network (G-PON) or
   10 Gigabit-capable Passive Optical Network (XG-PON) using the G-PON
   and XG-PON management protocol, Optical Network Termination
   Management and Control Interface (OMCI).  This simplifies and speeds
   up PW provisioning compared with manual configuration.

   This document also shows how an MS-PW may be constructed from an end
   segment supported over a PON, and switched to one or more segments
   supported over an MPLS PSN.

Li, et al.                    Informational                     [Page 1]
RFC 6456            Multi-Segment Pseudowires in PON       November 2011

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6456.

Copyright Notice

   Copyright (c) 2011 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 ....................................................2
   2. Terminology for G-PON/XG-PON ....................................5
   3. Multi-Segment Pseudowire over PON Network Reference Model .......6
   4. Label Provisioning for Pseudowires over PON .....................9
   5. Security Considerations .........................................9
   6. References .....................................................10
      6.1. Normative References ......................................10
      6.2. Informative References ....................................11

1.  Introduction

   The use of PWs in Packet Switched Networks (PSNs) is defined in
   [RFC3985].  This architecture is extended in [RFC5659] for multi-
   segment pseudowires (MS-PWs) satisfying the requirements in
   [RFC5254].  More detail on MS-PWs is provided in [RFC6073].

Li, et al.                    Informational                     [Page 2]
RFC 6456            Multi-Segment Pseudowires in PON       November 2011

   An MS-PW is a useful technology for certain applications where there
   is an aggregation of paths toward a common point in the network,
   e.g., mobile backhaul; the segments can be aggregated within tunnels
   between PW switching points thus improving scalability and reducing
   the number of control plane adjacencies where a control plane is
   used.

   Segments of an MS-PW in a PSN can be set up using manual provisioning