Considerations for Deploying the Rapid Acquisition of Multicast RTP Sessions (RAMS) Method
RFC 6659
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Type |
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RFC - Informational
(July 2012; No errata)
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Last updated |
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2015-10-14
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Replaces |
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draft-begen-avtext-rams-scenarios
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Stream |
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IETF
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plain text
pdf
html
bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Keith Drage
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| IESG |
IESG state |
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RFC 6659 (Informational)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Gonzalo Camarillo
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IESG note |
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Keith Drage (keith.drage@alcatel-lucent.com) is the document shepherd.
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Send notices to |
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(None)
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Internet Engineering Task Force (IETF) A. Begen
Request for Comments: 6659 Cisco
Category: Informational July 2012
ISSN: 2070-1721
Considerations for Deploying the Rapid Acquisition of
Multicast RTP Sessions (RAMS) Method
Abstract
The Rapid Acquisition of Multicast RTP Sessions (RAMS) solution is a
method based on RTP and the RTP Control Protocol (RTCP) that enables
an RTP receiver to rapidly acquire and start consuming the RTP
multicast data. Upon a request from the RTP receiver, an auxiliary
unicast RTP retransmission session is set up between a retransmission
server and the RTP receiver, over which the reference information
about the new multicast stream the RTP receiver is about to join is
transmitted at an accelerated rate. This often precedes, but may
also accompany, the multicast stream itself. When there is only one
multicast stream to be acquired, the RAMS solution works in a
straightforward manner. However, when there are two or more
multicast streams to be acquired from the same or different multicast
RTP sessions, care should be taken to configure each RAMS session
appropriately. This document provides example scenarios and
discusses how the RAMS solution could be used in such scenarios.
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/rfc6659.
Begen Informational [Page 1]
RFC 6659 RAMS Considerations July 2012
Copyright Notice
Copyright (c) 2012 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 ....................................................2
2. Background ......................................................3
3. Example Scenarios ...............................................4
3.1. Scenario #1: Two Multicast Groups ..........................4
3.2. Scenario #2: One Multicast Group ...........................5
3.3. Scenario #3: SSRC Multiplexing .............................6
3.4. Scenario #4: Payload-Type Multiplexing .....................6
4. Feedback Target and SSRC Signaling Issues .......................7
5. FEC during RAMS and Bandwidth Issues ............................7
5.1. Scenario #1 ................................................7
5.2. Scenario #2 ................................................9
5.3. Scenario #3 ...............................................10
6. Security Considerations ........................................10
7. Acknowledgments ................................................10
8. References .....................................................11
8.1. Normative References ......................................11
8.2. Informative References ....................................11
1. Introduction
The Rapid Acquisition of Multicast RTP Sessions (RAMS) solution is a
method based on RTP and the RTP Control Protocol (RTCP) that enables
an RTP receiver to rapidly acquire and start consuming the RTP
multicast data. Through an auxiliary unicast RTP retransmission
session [RFC4588], the RTP receiver receives reference information
about the new multicast stream it is about to join. This often
precedes, but may also accompany, the multicast stream itself. The
RAMS solution is documented in detail in [RFC6285].
Begen Informational [Page 2]
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