RTP Topologies
RFC 7667

Document Type RFC - Informational (November 2015; No errata)
Obsoletes RFC 5117
Last updated 2015-11-18
Replaces draft-westerlund-avtcore-rtp-topologies-update
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Roni Even
Shepherd write-up Show (last changed 2015-04-13)
IESG IESG state RFC 7667 (Informational)
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Responsible AD Ben Campbell
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Internet Engineering Task Force (IETF)                     M. Westerlund
Request for Comments: 7667                                      Ericsson
Obsoletes: 5117                                                S. Wenger
Category: Informational                                            Vidyo
ISSN: 2070-1721                                            November 2015

                             RTP Topologies

Abstract

   This document discusses point-to-point and multi-endpoint topologies
   used in environments based on the Real-time Transport Protocol (RTP).
   In particular, centralized topologies commonly employed in the video
   conferencing industry are mapped to the RTP terminology.

   This document is updated with additional topologies and replaces RFC
   5117.

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/rfc7667.

Westerlund & Wenger           Informational                     [Page 1]
RFC 7667                     RTP Topologies                November 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.

Westerlund & Wenger           Informational                     [Page 2]
RFC 7667                     RTP Topologies                November 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Definitions Related to RTP Grouping Taxonomy  . . . . . .   5
   3.  Topologies  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Point to Point  . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Point to Point via Middlebox  . . . . . . . . . . . . . .   7
       3.2.1.  Translators . . . . . . . . . . . . . . . . . . . . .   7
       3.2.2.  Back-to-Back RTP sessions . . . . . . . . . . . . . .  11
     3.3.  Point to Multipoint Using Multicast . . . . . . . . . . .  12
       3.3.1.  Any-Source Multicast (ASM)  . . . . . . . . . . . . .  12
       3.3.2.  Source-Specific Multicast (SSM) . . . . . . . . . . .  14
       3.3.3.  SSM with Local Unicast Resources  . . . . . . . . . .  15
     3.4.  Point to Multipoint Using Mesh  . . . . . . . . . . . . .  17
     3.5.  Point to Multipoint Using the RFC 3550 Translator . . . .  20
       3.5.1.  Relay - Transport Translator  . . . . . . . . . . . .  20
       3.5.2.  Media Translator  . . . . . . . . . . . . . . . . . .  21
     3.6.  Point to Multipoint Using the RFC 3550 Mixer Model  . . .  22
       3.6.1.  Media-Mixing Mixer  . . . . . . . . . . . . . . . . .  24
       3.6.2.  Media-Switching Mixer . . . . . . . . . . . . . . . .  27
     3.7.  Selective Forwarding Middlebox  . . . . . . . . . . . . .  29
     3.8.  Point to Multipoint Using Video-Switching MCUs  . . . . .  33
     3.9.  Point to Multipoint Using RTCP-Terminating MCU  . . . . .  34
     3.10. Split Component Terminal  . . . . . . . . . . . . . . . .  35
     3.11. Non-symmetric Mixer/Translators . . . . . . . . . . . . .  38
     3.12. Combining Topologies  . . . . . . . . . . . . . . . . . .  38
   4.  Topology Properties . . . . . . . . . . . . . . . . . . . . .  39
     4.1.  All-to-All Media Transmission . . . . . . . . . . . . . .  39
     4.2.  Transport or Media Interoperability . . . . . . . . . . .  40
     4.3.  Per-Domain Bitrate Adaptation . . . . . . . . . . . . . .  40
     4.4.  Aggregation of Media  . . . . . . . . . . . . . . . . . .  41
     4.5.  View of All Session Participants  . . . . . . . . . . . .  41
     4.6.  Loop Detection  . . . . . . . . . . . . . . . . . . . . .  42
     4.7.  Consistency between Header Extensions and RTCP  . . . . .  42
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