Internet Engineering Task Force H. Xie
Internet-Draft Huawei & USTC
Intended status: Informational T. Tsou
Expires: July 13, 2013 Huawei (USA)
D. Lopez
Telefonica I+D
H. Yin
Huawei (USA)
January 9, 2013
Use Cases for ALTO with Software Defined Networks
draft-xie-alto-sdn-extension-use-cases-01
Abstract
The introduction of SDN fundamentally changes the way that the
application layer traffic optimization (ALTO) works. This draft
describes two architectures, the Vertical Architecture and the
Horizontal Architecture, allowing coherent coexistence of ALTO and
software defined network (SDN). Unique requirements for design and
operations are identified and summarized, suggesting that the
Vertical Architecture allows better division, management,
flexibility, privacy control and long-term evolution of the network.
We also define the main interactions and information flows, and
present a set of use cases to illustrate how we extend ALTO to
support SDN, in the Vertical Architecture.
Status of this Memo
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This Internet-Draft will expire on July 13, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
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Internet-Draft ALTO Use Cases For SDN January 2013
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Xie, et al. Expires July 13, 2013 [Page 2]
Internet-Draft ALTO Use Cases For SDN January 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. An Overview of Software Defined Network . . . . . . . . . . . 5
2.1. Software Defined Network and Applications . . . . . . . . 5
2.2. Division of Network . . . . . . . . . . . . . . . . . . . 6
2.3. SDN Domain . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Architectures for Co-existing SDN and ALTO . . . . . . . . . . 9
3.1. ALTO Changes Due to SDN . . . . . . . . . . . . . . . . . 9
3.1.1. ALTO Scopes . . . . . . . . . . . . . . . . . . . . . 9
3.1.2. ALTO clients . . . . . . . . . . . . . . . . . . . . . 10
3.2. The Vertical and Horizontal Architectures . . . . . . . . 11
3.3. Interactions between SDN and ALTO . . . . . . . . . . . . 13
3.3.1. Downward Interaction . . . . . . . . . . . . . . . . . 13
3.3.2. Upward Interaction . . . . . . . . . . . . . . . . . . 14
3.4. Interactions between Legacy ALTO Clients and ALTO
Servers . . . . . . . . . . . . . . . . . . . . . . . . . 15
4. Information Flows . . . . . . . . . . . . . . . . . . . . . . 15
4.1. Information Flow of SDN Controller . . . . . . . . . . . . 15
4.2. Information Flow of Applications, SDN and ALTO . . . . . . 16
4.2.1. SDN-aware Applications . . . . . . . . . . . . . . . . 16
4.2.2. SDN-unaware Applications . . . . . . . . . . . . . . . 17
4.2.3. Legacy Applications . . . . . . . . . . . . . . . . . 17
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