IGP Multicast Architecture
draft-yong-rtgwg-igp-multicast-arch-00

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Network Working Group                                          L. Yong
Internet Draft                                                  W. Hao
                                                            D. Eastlake
Category: Standard Track                                         Huawei
                                                                 A. Qu
                                                               MetiaTek
                                                              J. Hudson
                                                                Brocade
                                                            U. Chunduri
                                                               Ericsson

Expires: April 2015                                  October 27, 2014

                        IGP Multicast Architecture

                  draft-yong-rtgwg-igp-multicast-arch-00

Abstract

This document specifies Interior Gateway Protocol (IGP) network
architecture to support multicast transport. It describes the
architecture components and the algorithms to automatically build a
distribution tree for transporting multicast traffic and provides a
method of pruning that tree for improved efficiency.

Status of this document

   This Internet-Draft is submitted to IETF in full conformance with
   the provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 27, 2015.

Yong, et al                                                    [Page 1]
Internet-Draft        IGP Multicast Architecture           October 2014

Copyright Notice

   Copyright (c) 2014 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.

Table of Contents

   1. Introduction...................................................3
      1.1. Motivation................................................3
      1.2. Conventions used in this document.........................4
   2. IGP Architecture for Multicast Transport RTADDR sub-TLV........4
   3. Computation Algorithms in IGP Multicast Domain.................5
      3.1. Automatic Tree Root Node Selection........................5
      3.2. Distribution Tree Computation.............................5
         3.2.1. Parent Selection.....................................6
         3.2.2. Parallel Local Link Selection........................6
      3.3. Multiple Distribute Trees for a Multicast Group...........7
      3.4. Pruning a Distribution Tree for a Group...................7
   4. Router Forwarding Procedures...................................8
      4.1. Packet Forwarding Along a Pruned Distribution Tree........8
      4.2. Local Forwarding at Edge Router...........................8
         4.2.1. Overlay Multicast Transport..........................9
      4.3. Multi-homing Access Through Active-active MC-LAG.........10
      4.4. Reverse Path Forwarding Check (RPFC).....................11
   5. Security Considerations.......................................11
   6. IANA Considerations...........................................11
   7. Acknowledgements..............................................11
   8. References....................................................12
      8.1. Normative References.....................................12
      8.2. Informative References...................................12

Yong, et al.                                                   [Page 2]
Internet-Draft        IGP Multicast Architecture           October 2014

1. Introduction

   This document specifies Interior Gateway Protocol (IGP) network
   architecture to support multicast transport. It describes the
   architecture components and the algorithms to automatically build a
   distribution tree for transporting multicast traffic and provides a
   method of pruning that tree for improved efficiency.

   An IGP network is built to transport unicast traffic. Transporting
   multicast traffic relies on a protocol independent mechanism and a
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