Duplication Delay Attribute in the Session Description Protocol (RFC7197)
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-Apr-26
Internet Society Requests For Comment (RFCs)
A. Begen: AUTHOR [+3]
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.
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
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
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