Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)
RFC 8077

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Internet Engineering Task Force (IETF)                   L. Martini, Ed.
Request for Comments: 8077                                 G. Heron, Ed.
STD: 84                                                            Cisco
Obsoletes: 4447, 6723                                      February 2017
Category: Standards Track
ISSN: 2070-1721

                    Pseudowire Setup and Maintenance
              Using the Label Distribution Protocol (LDP)

Abstract

   Layer 2 services (such as Frame Relay, Asynchronous Transfer Mode,
   and Ethernet) can be emulated over an MPLS backbone by encapsulating
   the Layer 2 Protocol Data Units (PDUs) and then transmitting them
   over pseudowires (PWs).  It is also possible to use pseudowires to
   provide low-rate Time-Division Multiplexed and Synchronous Optical
   NETworking circuit emulation over an MPLS-enabled network.  This
   document specifies a protocol for establishing and maintaining the
   pseudowires, using extensions to the Label Distribution Protocol
   (LDP).  Procedures for encapsulating Layer 2 PDUs are specified in
   other documents.

   This document is a rewrite of RFC 4447 for publication as an Internet
   Standard.

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/rfc8077.

Martini & Heron              Standards Track                    [Page 1]
RFC 8077                     PWE3 Using LDP                February 2017

Copyright Notice

   Copyright (c) 2017 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
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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Martini & Heron              Standards Track                    [Page 2]
RFC 8077                     PWE3 Using LDP                February 2017

Table of Contents

   1. Introduction ....................................................4
   2. Changes from RFC 4447 ...........................................6
   3. Specification of Requirements ...................................6
   4. The Pseudowire Label ............................................7
   5. Details Specific to Particular Emulated Services ................9
      5.1. IP Layer 2 Transport .......................................9
   6. LDP .............................................................9
      6.1. The PWid FEC Element .......................................9
      6.2. The Generalized PWid FEC Element ..........................11
           6.2.1. Attachment Identifiers .............................12
           6.2.2. Encoding the Generalized PWid FEC Element ..........14
                  6.2.2.1. PW Interface Parameters TLV ...............15
                  6.2.2.2. PW Group ID TLV ...........................15
           6.2.3. Signaling Procedures ...............................16
      6.3. Signaling of Pseudowire Status ............................17
           6.3.1. Use of Label Mapping Messages ......................17
           6.3.2. Signaling PW Status ................................18
           6.3.3. Pseudowire Status Negotiation Procedures ...........19
      6.4. Interface Parameter Sub-TLV ...............................20
      6.5. LDP Label Withdrawal Procedures ...........................21