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