ALTO L. Deng
Internet-Draft China Mobile
Intended status: Informational H. Song
Expires: August 17, 2014 Huawei
February 13, 2014
End Point Properties for Peer Selection
draft-deng-alto-p2p-ext-00.txt
Abstract
The initial purpose for ALTO protocol is to provide better than
random peer selection for p2p networks. The peer selection method
does not only depend on the peer location, but also on other
properties of a peering node. In this document, we define the
possible ALTO endpoint property extensions that will impact peer
selection.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. End Point Extensions . . . . . . . . . . . . . . . . . . . . 2
3.1. Endpoint Property Type: p2p_caching . . . . . . . . . . . 3
3.2. Endpoint Property Type: battery_limited . . . . . . . . . 3
3.3. Endpoint Property Type: network_access . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
The initial purpose for ALTO protocol is to provide better than
random peer selection for p2p networks. The peer selection method
does not only depend on the peer location, but also on other
properties of a peering node. In this document, we define the
possible ALTO endpoint property extensions that will impact peer
selection.
2. Terminology
ALTO: application layer traffic optimization. For ALTO protocol,
please refer to [I-D.ietf-alto-protocol].
DSL: Digital subscriber line, is a family of technologies that
provide Internet access by transmitting digital data over the wires
of a local telephone network.
FTTB: Fiber To The Building, refers to fiber reaches the boundary of
the building.
FTTH: Fiber To The Home, refers to figure reaches the the boundary of
the living space.
3. End Point Extensions
This document provides three endpoint property extensions for ALTO
protocol.
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3.1. Endpoint Property Type: p2p_caching
As described in [I-D.draft-deng-alto-p2pcache], P2P caching node can
also act as p2p peers in a p2p network. If a p2p caching peer is
located near the edge of the network, it will reduce the backbone
traffic, as well as the uploading traffic. For example, [RFC7069]
provides one example of such caching nodes. P2P caching peers
usually have higher priority than the ordinary peers for serving a
content request so as to optimize the network traffic. So it's
necessary for the endpoint property to support this indication.
The value for this property is either "true" or "false", in ASCII.
If the peer in question is actually a caching node, the value of this
property wrt the peer is set to "true".
3.2. Endpoint Property Type: battery_limited
Another important endpoint property that will impact peer selection
is what kind of power supply the peer has. It can be either the
electric power or the battery supply. And most of the time, it is
obvious that electric power supplied nodes are more likely online
longer than those battery supplied nodes. And most of the nowadays
intelligent equipments are aware of their power supply type. But it
is necessary that whether or not the power supply of a peer is
limited by its battery can be queried through some method.
The value for this property is either "true" or "false", in ASCII.
If the peer in question is actually battery-limited, the value of
this property wrt the peer is set to "true".
3.3. Endpoint Property Type: network_access
The third important endpoint property that will impact peer selection
is the node access type. If it is a node owned by home user, the
access type can be DSL, or FTTB, or FTTH. If it is deployed in a
data center, we can specify a special access type for it, because it
is more robust, and is more likely to have more network resources
than home users. A p2p application may have its own algorithm for
peer selection if this information can be provided.
The value for this property can be enumerated as "adsl", "ftth",
"fttb", "dc", and etc.
4. Security Considerations
The indication of new endpoint properties to the ALTO clients may set
targets for the malicious nodes to hack.
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5. IANA Considerations
This document adds the following new endpoint property type to the
existing registry created by ALTO protocol [I-D.ietf-alto-protocol].
+---------------+---------------------------------------+
|Identifier |Intended Semantics |
+---------------+---------------------------------------+
|p2p_caching |Whether the peer is a network cache, |
| |value is "true" or "false", in ASCII. |
+---------------+---------------------------------------+
|power_supply |Whether the peer is battery-limited, |
| |value is "true" or "false", in ASCII. |
+---------------+---------------------------------------+
|network_access |The type of access network of the peer,|
| |value is enumerated as "adsl", "ftth", |
| |"fttb", "dc", in ASCII. |
+---------------+---------------------------------------+
6. References
6.1. Normative References
[I-D.ietf-alto-protocol]
Alimi, R., Penno, R., and Y. Yang, "ALTO Protocol", draft-
ietf-alto-protocol-25 (work in progress), January 2014.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
6.2. Informative References
[I-D.draft-deng-alto-p2pcache]
Deng, L., Chen, W., and Q. Yi, "Considerations for ALTO
with network-deployed P2P caches", draft-deng-alto-
p2pcache-03 (work in progress), February 2014.
[RFC7069] Alimi, R., Rahman, A., Kutscher, D., Yang, Y., Song, H.,
and K. Pentikousis, "DECoupled Application Data Enroute
(DECADE)", RFC 7069, November 2013.
Authors' Addresses
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Lingli Deng
China Mobile
Email: denglingli@chinamobile.com
Haibin Song
Huawei
Email: haibin.song@huawei.com
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