LDP Extensions for Pseudowire Binding to Label Switched Path (LSP) Tunnels
RFC 7965

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Internet Engineering Task Force (IETF)                           M. Chen
Request for Comments: 7965                                        W. Cao
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                A. Takacs
                                                                Ericsson
                                                                  P. Pan
                                                             August 2016

                     LDP Extensions for Pseudowire
              Binding to Label Switched Path (LSP) Tunnels

Abstract

   Many transport services require that user traffic, in the form of
   Pseudowires (PWs), be delivered via either a single co-routed
   bidirectional tunnel or two unidirectional tunnels that share the
   same routes.  This document defines an optional extension to the
   Label Distribution Protocol (LDP) that enables the binding between
   PWs and the underlying Traffic Engineering (TE) tunnels.  The
   extension applies to both single-segment and multi-segment PWs.

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 7841.

   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/rfc7965.

Chen, et al.                 Standards Track                    [Page 1]
RFC 7965           Explicit PW-to-LSP Tunnels Binding        August 2016

Copyright Notice

   Copyright (c) 2016 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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  LDP Extensions  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  PSN Tunnel Binding TLV  . . . . . . . . . . . . . . . . .   5
       3.1.1.  PSN Tunnel Sub-TLV  . . . . . . . . . . . . . . . . .   7
   4.  Theory of Operation . . . . . . . . . . . . . . . . . . . . .   8
   5.  PSN Binding Operation for SS-PW . . . . . . . . . . . . . . .   9
   6.  PSN Binding Operation for MS-PW . . . . . . . . . . . . . . .  11
   7.  PSN Tunnel Select Considerations  . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  LDP TLV Types . . . . . . . . . . . . . . . . . . . . . .  13
       9.1.1.  PSN Tunnel Sub-TLVs . . . . . . . . . . . . . . . . .  14
     9.2.  LDP Status Codes  . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

Chen, et al.                 Standards Track                    [Page 2]
RFC 7965           Explicit PW-to-LSP Tunnels Binding        August 2016

1.  Introduction

   Pseudo Wire Emulation Edge-to-Edge (PWE3) [RFC3985] is a mechanism to
   emulate Layer 2 services, such as Ethernet Point-to-Point circuits.
   Such services are emulated between two Attachment Circuits, and the
   Pseudowire-encapsulated Layer 2 service payload is transported via
   Packet Switching Network (PSN) tunnels between Provider Edges (PEs).
   PWE3 typically uses the Label Distribution Protocol (LDP) [RFC5036]
   or Resource Reservation Protocol - Traffic Engineering (RSVP-TE)
   [RFC3209] Label Switched Paths (LSPs) as PSN tunnels.  The PEs select
   and bind the Pseudowires to PSN tunnels independently.  Today, there
   is no standardized protocol-based provisioning mechanism to associate
   PWs with PSN tunnels; such associations must be managed via
   provisioning or other private methods.

   PW-to-PSN Tunnel Binding has become increasingly common and important