PPSP A. Bakker
Internet-Draft Vrije Universiteit Amsterdam
Intended status: Standards Track R. Petrocco
Expires: April 30, 2015 V. Grishchenko
Technische Universiteit Delft
October 27, 2014
Peer-to-Peer Streaming Peer Protocol (PPSPP)
draft-ietf-ppsp-peer-protocol-11
Abstract
The Peer-to-Peer Streaming Peer Protocol (PPSPP) is a protocol for
disseminating the same content to a group of interested parties in a
streaming fashion. PPSPP supports streaming of both pre-recorded
(on-demand) and live audio/video content. It is based on the peer-
to-peer paradigm, where clients consuming the content are put on
equal footing with the servers initially providing the content, to
create a system where everyone can potentially provide upload
bandwidth. It has been designed to provide short time-till-playback
for the end user, and to prevent disruption of the streams by
malicious peers. PPSPP has also been designed to be flexible and
extensible. It can use different mechanisms to optimize peer
uploading, prevent freeriding, and work with different peer discovery
schemes (centralized trackers or Distributed Hash Tables). It
supports multiple methods for content integrity protection and chunk
addressing. Designed as a generic protocol that can run on top of
various transport protocols, it currently runs on top of UDP using
LEDBAT for congestion control.
Status of This Memo
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This Internet-Draft will expire on April 30, 2015.
Bakker, et al. Expires April 30, 2015 [Page 1]Internet-Draft PPSP Peer Protocol October 2014Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2. Requirements Language . . . . . . . . . . . . . . . . . . 6
1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6
2. Overall Operation . . . . . . . . . . . . . . . . . . . . . . 8
2.1. Example: Joining a Swarm . . . . . . . . . . . . . . . . 9
2.2. Example: Exchanging Chunks . . . . . . . . . . . . . . . 9
2.3. Example: Leaving a Swarm . . . . . . . . . . . . . . . . 10
3. Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1. HANDSHAKE . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2. HAVE . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3. DATA . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4. ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5. INTEGRITY . . . . . . . . . . . . . . . . . . . . . . . . 12
3.6. SIGNED_INTEGRITY . . . . . . . . . . . . . . . . . . . . 12
3.7. REQUEST . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.8. CANCEL . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.9. CHOKE and UNCHOKE . . . . . . . . . . . . . . . . . . . . 13
3.10. Peer Address Exchange . . . . . . . . . . . . . . . . . . 14
3.10.1. PEX_REQ and PEX_RES Messages . . . . . . . . . . . . 14
3.11. Channels . . . . . . . . . . . . . . . . . . . . . . . . 15
3.12. Keep Alive Signalling . . . . . . . . . . . . . . . . . . 16
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