Multipoint LDP (mLDP) In-Band Signaling with Wildcards
RFC 7438

Document Type RFC - Proposed Standard (January 2015; No errata)
Last updated 2015-10-14
Replaces draft-wijnands-mpls-mldp-in-band-wildcard-encoding
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
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IESG IESG state RFC 7438 (Proposed Standard)
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Responsible AD Adrian Farrel
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                 IJ. Wijnands, Ed.
Request for Comments: 7438                           Cisco Systems, Inc.
Updates: 6826, 7246                                             E. Rosen
Category: Standards Track                         Juniper Networks, Inc.
ISSN: 2070-1721                                                 A. Gulko
                                                         Thomson Reuters
                                                               U. Joorde
                                                        Deutsche Telekom
                                                             J. Tantsura
                                                                Ericsson
                                                            January 2015

         Multipoint LDP (mLDP) In-Band Signaling with Wildcards

Abstract

   There are scenarios in which an IP multicast tree traverses an MPLS
   domain.  In these scenarios, it can be desirable to convert the IP
   multicast tree "seamlessly" into an MPLS Multipoint Label Switched
   Path (MP-LSP) when it enters the MPLS domain, and then to convert it
   back to an IP multicast tree when it exits the MPLS domain.  Previous
   documents specify procedures that allow certain kinds of IP multicast
   trees (either Source-Specific Multicast trees or Bidirectional
   Multicast trees) to be attached to an MPLS Multipoint Label Switched
   Path (MP-LSP).  However, the previous documents do not specify
   procedures for attaching IP Any-Source Multicast trees to MP-LSPs,
   nor do they specify procedures for aggregating multiple IP multicast
   trees onto a single MP-LSP.  This document specifies the procedures
   to support these functions.  It does so by defining "wildcard"
   encodings that make it possible to specify, when setting up an MP-
   LSP, that a set of IP multicast trees, or a shared IP multicast tree,
   should be attached to that MP-LSP.  Support for non-bidirectional IP
   Any-Source Multicast trees is subject to certain applicability
   restrictions that are discussed in this document.  This document
   updates RFCs 6826 and 7246.

Wijnands, et al.             Standards Track                    [Page 1]
RFC 7438          mLDP In-Band Signaling with Wildcards     January 2015

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/rfc7438.

Copyright Notice

   Copyright (c) 2015 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.

Wijnands, et al.             Standards Track                    [Page 2]
RFC 7438          mLDP In-Band Signaling with Wildcards     January 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Definitions . . . . . . . . . . . . . . . . .   5
   3.  Wildcards in mLDP Opaque Value TLVs . . . . . . . . . . . . .   7
     3.1.  Encoding the Wildcards  . . . . . . . . . . . . . . . . .   7
     3.2.  Wildcard Semantics  . . . . . . . . . . . . . . . . . . .   8
     3.3.  Backwards Compatibility . . . . . . . . . . . . . . . . .   8
     3.4.  Applicability Restrictions with Regard to ASM . . . . . .   9
   4.  Some Wildcard Use Cases . . . . . . . . . . . . . . . . . . .   9
     4.1.  PIM Shared Tree Forwarding  . . . . . . . . . . . . . . .   9
     4.2.  IGMP/MLD Proxying . . . . . . . . . . . . . . . . . . . .  11
     4.3.  Selective Source Mapping  . . . . . . . . . . . . . . . .  11
   5.  Procedures for Wildcard Source Usage  . . . . . . . . . . . .  11
   6.  Procedures for Wildcard Group Usage . . . . . . . . . . . . .  13
   7.  Determining the MP-LSP Root (Ingress LSR) . . . . . . . . . .  13
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