Requirements for Point-to-Multipoint Extensions to the Label Distribution Protocol
RFC 6348

Internet Engineering Task Force (IETF)                   J. Le Roux, Ed.
Request for Comments: 6348                                 T. Morin, Ed.
Category: Historic                               France Telecom - Orange
ISSN: 2070-1721                                           September 2011

            Requirements for Point-to-Multipoint Extensions
                   to the Label Distribution Protocol

Abstract

   This document lists a set of functional requirements that served as
   input to the design of Label Distribution Protocol (LDP) extensions
   for setting up point-to-multipoint (P2MP) Label Switched Paths (LSP),
   in order to deliver point-to-multipoint applications over a
   Multiprotocol Label Switching (MPLS) infrastructure.

   This work was overtaken by the protocol solution developed by the
   MPLS working group, but that solution did not closely follow the
   requirements documented here.  This document is published as a
   historic record of the ideas and requirements that shaped the
   protocol work.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for the historical record.

   This document defines a Historic Document for the Internet community.
   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/rfc6348.

Le Roux & Morin                 Historic                        [Page 1]
RFC 6348             Reqs for P2MP Extensions to LDP      September 2011

Copyright Notice

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   document authors.  All rights reserved.

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   Without obtaining an adequate license from the person(s) controlling
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   it for publication as an RFC or to translate it into languages other
   than English.

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RFC 6348             Reqs for P2MP Extensions to LDP      September 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
     1.2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . .  4
     1.3.  Context and Motivations  . . . . . . . . . . . . . . . . .  6
     1.4.  Document Scope . . . . . . . . . . . . . . . . . . . . . .  7
   2.  Requirements Overview  . . . . . . . . . . . . . . . . . . . .  7
   3.  Application Scenario . . . . . . . . . . . . . . . . . . . . .  8
   4.  Detailed Requirements  . . . . . . . . . . . . . . . . . . . .  9
     4.1.  P2MP LSPs  . . . . . . . . . . . . . . . . . . . . . . . .  9
     4.2.  P2MP LSP FEC . . . . . . . . . . . . . . . . . . . . . . . 10
     4.3.  P2MP LDP Routing . . . . . . . . . . . . . . . . . . . . . 10
     4.4.  Setting Up, Tearing Down, and Modifying P2MP LSPs  . . . . 10
     4.5.  Label Advertisement  . . . . . . . . . . . . . . . . . . . 10
     4.6.  Data Duplication . . . . . . . . . . . . . . . . . . . . . 11
     4.7.  Detecting and Avoiding Loops . . . . . . . . . . . . . . . 11
     4.8.  P2MP LSP Rerouting . . . . . . . . . . . . . . . . . . . . 11
     4.9.  Support for Multi-Access Networks  . . . . . . . . . . . . 12
     4.10. Support for Encapsulation in P2P and P2MP TE Tunnels . . . 12