Using LDP Multipoint Extensions on Targeted LDP Sessions
RFC 7060

Document Type RFC - Proposed Standard (November 2013; No errata)
Last updated 2013-11-25
Replaces draft-napierala-mpls-targeted-mldp
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Document shepherd Loa Andersson
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IESG IESG state RFC 7060 (Proposed Standard)
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Responsible AD Adrian Farrel
Send notices to mpls-chairs@ietf.org, draft-ietf-mpls-targeted-mldp@ietf.org
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IANA action state No IC
Internet Engineering Task Force (IETF)                      M. Napierala
Request for Comments: 7060                                          AT&T
Category: Standards Track                                       E. Rosen
ISSN: 2070-1721                                             IJ. Wijnands
                                                     Cisco Systems, Inc.
                                                           November 2013

        Using LDP Multipoint Extensions on Targeted LDP Sessions

Abstract

   Label Distribution Protocol (LDP) can be used to set up Point-to-
   Multipoint (P2MP) and Multipoint-to-Multipoint (MP2MP) Label Switched
   Paths.  However, the specification for the Multipoint Extensions to
   LDP presupposes that the two endpoints of an LDP session are directly
   connected.  The LDP base specification allows for the case where the
   two endpoints of an LDP session are not directly connected; such a
   session is known as a "Targeted LDP" session.  This document provides
   the specification for using the LDP Multipoint Extensions over a
   Targeted LDP session.

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 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/rfc7060.

Napierala, et al.            Standards Track                    [Page 1]
RFC 7060           LDP Multipoint on Targeted Sessions     November 2013

Copyright Notice

   Copyright (c) 2013 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. Targeted mLDP and the Upstream LSR ..............................3
      2.1. Selecting the Upstream LSR .................................3
      2.2. Sending Data from U to D ...................................4
   3. Applicability of Targeted mLDP ..................................4
   4. LDP Capabilities ................................................5
   5. Targeted mLDP with Unicast Replication ..........................5
   6. Targeted mLDP with Multicast Tunneling ..........................6
   7. Security Considerations .........................................8
   8. Acknowledgments .................................................8
   9. Normative References ............................................8

1.  Introduction

   Label Distribution Protocol (LDP) extensions for setting up Point-to-
   Multipoint (P2MP) Label Switched Paths (LSPs) and Multipoint-to-
   Multipoint (MP2MP) LSPs are specified in [mLDP].  This set of
   extensions is generally known as "Multipoint LDP" (mLDP).

   A pair of Label Switched Routers (LSRs) that are the endpoints of an
   LDP session are considered to be "LDP peers".  When a pair of LDP
   peers are "directly connected" (e.g., they are connected by a layer 2
   medium or are otherwise considered to be neighbors by the network's
   interior routing protocol), the LDP session is said to be a "directly
   connected" LDP session.  When the pair of LDP peers are not directly
   connected, the session between them is said to be a "Targeted" LDP
   session.

   The base specification for mLDP does not explicitly cover the case
   where the LDP multipoint extensions are used over a Targeted LDP
   session.  This document provides that specification.

Napierala, et al.            Standards Track                    [Page 2]
RFC 7060           LDP Multipoint on Targeted Sessions     November 2013

   We will use the term "Multipoint" to mean "either P2MP or MP2MP".

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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