Multicast-Only Fast Reroute
RFC 7431

Document Type RFC - Informational (August 2015; No errata)
Last updated 2015-10-14
Replaces draft-karan-mofrr
Stream IETF
Formats plain text html pdf htmlized bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Alvaro Retana
Shepherd write-up Show (last changed 2015-02-11)
IESG IESG state RFC 7431 (Informational)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alia Atlas
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                          A. Karan
Request for Comments: 7431                                   C. Filsfils
Category: Informational                                IJ. Wijnands, Ed.
ISSN: 2070-1721                                      Cisco Systems, Inc.
                                                             B. Decraene
                                                                  Orange
                                                             August 2015

                      Multicast-Only Fast Reroute

Abstract

   As IPTV deployments grow in number and size, service providers are
   looking for solutions that minimize the service disruption due to
   faults in the IP network carrying the packets for these services.
   This document describes a mechanism for minimizing packet loss in a
   network when node or link failures occur.  Multicast-only Fast
   Reroute (MoFRR) works by making simple enhancements to multicast
   routing protocols such as Protocol Independent Multicast (PIM) and
   Multipoint LDP (mLDP).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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/rfc7431.

Karan et al.                  Informational                     [Page 1]
RFC 7431                          MoFRR                      August 2015

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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................3
      1.2. Terminology ................................................3
   2. Basic Overview ..................................................4
   3. Determination of the Secondary UMH ..............................5
      3.1. ECMP-Mode MoFRR ............................................5
      3.2. Non-ECMP-Mode MoFRR ........................................5
   4. Upstream Multicast Hop Selection ................................6
      4.1. PIM ........................................................6
      4.2. mLDP .......................................................6
   5. Detecting Failures ..............................................6
   6. MoFRR Applicability to Dual-Plane Topology ......................7
   7. Other Topologies ...............................................10
   8. Capacity Planning for MoFRR ....................................11
   9. PE Nodes .......................................................11
   10. Other Applications ............................................11
   11. Security Considerations .......................................12
   12. References ....................................................12
      12.1. Normative References .....................................12
      12.2. Informative References ...................................12
   Acknowledgments ...................................................13
   Contributors ......................................................13
   Authors' Addresses ................................................14

Karan et al.                  Informational                     [Page 2]
RFC 7431                          MoFRR                      August 2015

1.  Introduction

   Different solutions have been developed and deployed to improve
   service guarantees, both for multicast video traffic and Video on
   Demand traffic.  Most of these solutions are geared towards finding
   an alternate path around one or more failed network elements (link,
   node, or path failures).

   This document describes a mechanism for minimizing packet loss in a
   network when node or link failures occur.  Multicast-only Fast
   Reroute (MoFRR) works by making simple changes to the way selected
Show full document text