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Multipoint LDP In-Band Signaling for Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths
RFC 6826

Internet Engineering Task Force (IETF)                 IJ. Wijnands, Ed.
Request for Comments: 6826                                     T. Eckert
Category: Standards Track                            Cisco Systems, Inc.
ISSN: 2070-1721                                               N. Leymann
                                                        Deutsche Telekom
                                                            M. Napierala
                                                               AT&T Labs
                                                            January 2013

                  Multipoint LDP In-Band Signaling for
 Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths

Abstract

   Consider an IP multicast tree, constructed by Protocol Independent
   Multicast (PIM), that needs to pass through an MPLS domain in which
   Multipoint LDP (mLDP) point-to-multipoint and/or multipoint-to-
   multipoint Labels Switched Paths (LSPs) can be created.  The part of
   the IP multicast tree that traverses the MPLS domain can be
   instantiated as a multipoint LSP.  When a PIM Join message is
   received at the border of the MPLS domain, information from that
   message is encoded into mLDP messages.  When the mLDP messages reach
   the border of the next IP domain, the encoded information is used to
   generate PIM messages that can be sent through the IP domain.  The
   result is an IP multicast tree consisting of a set of IP multicast
   sub-trees that are spliced together with a multipoint LSP.  This
   document describes procedures regarding how IP multicast trees are
   spliced together with multipoint LSPs.

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/rfc6826.

Wijnands, et al.             Standards Track                    [Page 1]
RFC 6826               In-Band Signaling with mLDP          January 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 . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Conventions Used in This Document  . . . . . . . . . . . .  3
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  In-Band Signaling for MP LSPs  . . . . . . . . . . . . . . . .  4
     2.1.  Transiting Unidirectional IP Multicast Shared Trees  . . .  6
     2.2.  Transiting IP Multicast Source Trees . . . . . . . . . . .  6
     2.3.  Transiting IP Multicast Bidirectional Trees  . . . . . . .  7
   3.  LSP Opaque Encodings . . . . . . . . . . . . . . . . . . . . .  8
     3.1.  Transit IPv4 Source TLV  . . . . . . . . . . . . . . . . .  8
     3.2.  Transit IPv6 Source TLV  . . . . . . . . . . . . . . . . .  8
     3.3.  Transit IPv4 Bidir TLV . . . . . . . . . . . . . . . . . .  9
     3.4.  Transit IPv6 Bidir TLV . . . . . . . . . . . . . . . . . .  9
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 11

Wijnands, et al.             Standards Track                    [Page 2]
RFC 6826               In-Band Signaling with mLDP          January 2013

1.  Introduction

   The mLDP (Multipoint LDP) [RFC6388] specification describes
   mechanisms for creating point-to-multipoint (P2MP) and multipoint-to-
   multipoint (MP2MP) LSPs (Label Switched Paths).  These LSPs are

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