IETF 82 Proceedings

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Decoupled Application Data Enroute (decade) (WG)

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Transport Area Director(s):

Transport Area Advisor:

Technical Advisor(s):

Meeting Slides


Request for Comments:

Charter (as of 2011-12-09)

Peer-to-Peer (P2P) applications, including both P2P streaming and P2P
file-sharing applications, make up a large fraction of traffic in
the Internet today. One way to reduce access network and/or cross-domain
bandwidth usage by P2P applications is to introduce storage capabilities
in the network between hosts running P2P applications. Allowing P2P
applications to store and retrieve data from inside the network can
reduce traffic on the last-mile uplink, as well as backbone and
transit links.

Existing P2P caches often implement the specific P2P application
protocols to operate transparently or act as super peers to provide
in-network storage. However, it is challenging for P2P cache vendors to
support a variety of evolving protocols. Also, for P2P applications,
closed P2P caching systems limit effective utilization of in-network
storage. Some P2P protocols may be entirely unsupported by a particular
caching system. Additionally, applications may be better-equipped to
decide how in-network storage is used to meet their specific
requirements (e.g., data placement, access control and resource
control). Note that providers of in-network storage may impose their
own access control or resource usage policies.

Both of these challenges can be effectively addressed by using open,
standard protocols to access in-network storage. P2P applications can
store and retrieve content in the in-network storage, as well as control
resources (e.g., bandwidth, connections) consumed by peers in a P2P
application. As a simple example, a peer can choose to store content in
the in-network storage, and direct other peers to retrieve from that
location, reducing last-mile link usage. Furthermore, since a P2P
client may have multiple peers, it can control resources used by each
peer to store and retrieve content. Though there are existing data
access protocols (e.g., HTTP, NFS, WebDAV), they might be lacking
capabilities for fine-grained access and resource control (e.g.,
bandwidth and connections) that are essential for today's advanced P2P

The Working Group (WG) will have three primary tasks. First, the WG will
identify target applications to appropriately scope the problem and
requirements. P2P applications are the primary target, but suitability
to other applications with similar requirements may be considered
depending on additional complexity required to support such

Second, the WG will identify the requirements to enable target
applications to utilize in-network storage. Requirements will include
the ability for an application to (1) store, retrieve, and manage data,
(2) indicate access control policies for storing and retrieving data
suitable to an environment with users across multiple administrative and
security domains (e.g., in a P2P environment), and (3) indicate resource
control policies for storing and retrieving data.

Third, the WG will develop an architecture within which the DECADE
protocol can be specified. This architecture will identify DECADE's
relationship to existing IETF protocols and where (if any) new protocol
is needed or extensions to existing protocols need to be made. The
architecture will not specify a protocol or extension; if development of
a new protocol is needed, the WG will seek to recharter for this purpose
or might ask an existing WG to work on such extensions.

The WG will focus on the following work items:

- A "problem statement" document. This document provides a description
of the problem and common terminology.

- A requirements document. This document lists the requirements for the
in-network storage service (e.g., supported operations) and the
protocol to support it. The service will include storing, retrieving,
and managing data as well as specifying both access control and
resource control policies in the in-network storage pertaining to that

- A survey document. This document will survey existing related
mechanisms and protocols (e.g., HTTP, NFS, and WebDAV), and evaluate
their applicability to DECADE.

- An architecture document. This document will identify DECADE's
relationship with existing IETF protocols. Existing protocols will be
used wherever possible and appropriate to support DECADE's
requirements. In particular, data storage, retrieval, and management
may be provided by an existing IETF protocols. The WG will not limit
itself to a single data transport protocol since different protocols
may have varying implementation costs and performance tradeoffs.
However, to keep interoperability manageable, a small number of
specific, targeted, data transport protocols will be identified and

- An document describing the integration of DECADE with existing P2P
applications (e.g., integration with BitTorrent).

If new protocol development is deemed necessary, the WG will be
rechartered. It is not expected that all work items will be ready for
IESG review by that point, but WG consensus must show that documents
directing eventual protocol development (Requirements and Architecture
document) have stabilized. This permits adjustments to such documents as
necessary to maintain consistency as protocol development is done.

The following issues are considered out-of-scope for the WG:

- Specification of policies regarding copyright-protected or illegal

- Locating the "best" in-network storage location from which to retrieve
content if there are more than one location can provide the same

- Developing a new protocol for data transport between P2P applications
and in-network storage.

Goals and Milestones:

Done  Working Group Last Call for Problem Statement
Done  Working Group Last Call for Survey document
Done  Submit Problem Statement to IESG as Informational
Done  Submit Survey document to IESG as Informational
Jul 2011  Working Group Last Call for Requirements document
Jul 2011  Working Group Last Call for Architecture document
Aug 2011  Submit Requirements document to IESG as Informational
Sep 2011  Identify need for rechartering
Sep 2011  Submit Architecture document to IESG as Informational
Sep 2011  Working Group Last Call for DECADE Integration Examples
Dec 2011  Submit DECADE Integration Examples to IESG as Informational