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Duplication Delay Attribute in the Session Description Protocol (RFC7197)

IP.com Disclosure Number: IPCOM000236449D
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-Apr-26
Document File: 22 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Begen: AUTHOR [+3]

Abstract

Inside an IP network, packet delivery may be interrupted due to failure of a physical link, interface, or device. To reduce the impact of such interruptions, some networks are built in a resilient manner, allowing for multiple alternative paths between two endpoints. However, if there is no resiliency in the network or the failure happens in a non-resilient part of the network, a temporary outage will occur (i.e., packets will get dropped). The outage will last until network reconvergence takes place (i.e., until connectivity is restored) around the failure. Typically, network reconvergence takes between tens and hundreds of milliseconds, depending on the size and features of the network.

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Internet Engineering Task Force (IETF)                          A. Begen Request for Comments: 7197                                         Cisco Category: Standards Track                                         Y. Cai ISSN: 2070-1721                                                Microsoft                                                                    H. Ou                                                                    Cisco                                                               April 2014

     Duplication Delay Attribute in the Session Description Protocol

Abstract

   A straightforward approach to provide protection against packet    losses due to network outages with a longest duration of T time units    is to duplicate the original packets and send each copy separated in    time by at least T time units.  This approach is commonly referred to    as "time-shifted redundancy", "temporal redundancy", or simply    "delayed duplication".  This document defines an attribute to    indicate the presence of temporally redundant media streams and the    duplication delay in the Session Description Protocol.

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/rfc7197.

 Begen, et al.                Standards Track                    [Page 1]
 RFC 7197           Duplication Delay Attribute in SDP         April 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.  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...