Book contents
- Frontmatter
- Contents
- List of illustrations
- List of tables
- Preface
- Acknowledgments
- Part I Introduction
- Part II Optical wide area networks
- Overview
- 5 Generalized multiprotocol label switching
- 6 Waveband switching
- 7 Photonic slot routing
- 8 Optical flow switching
- 9 Optical burst switching
- 10 Optical packet switching
- Part III Optical metropolitan area networks
- Part IV Optical access and local area networks
- Part V Testbeds
- Bibliography
- Index
5 - Generalized multiprotocol label switching
from Part II - Optical wide area networks
Published online by Cambridge University Press: 10 May 2010
- Frontmatter
- Contents
- List of illustrations
- List of tables
- Preface
- Acknowledgments
- Part I Introduction
- Part II Optical wide area networks
- Overview
- 5 Generalized multiprotocol label switching
- 6 Waveband switching
- 7 Photonic slot routing
- 8 Optical flow switching
- 9 Optical burst switching
- 10 Optical packet switching
- Part III Optical metropolitan area networks
- Part IV Optical access and local area networks
- Part V Testbeds
- Bibliography
- Index
Summary
We have briefly introduced the automatic switched optical network (ASON) framework for the control plane of optical networks in Section 2.5. The ASON framework facilitates the set-up, modification, reconfiguration, and release of both switched and soft-permanent optical connections. Switched connections are controlled by clients as opposed to soft-permanent connections whose set-up and tear-down are initiated by the network management system. An ASON consists of one or more domains, where each domain may belong to a different network operator, administrator, or vendor platform. In the ASON framework, the points of interaction between different domains are called reference points. Figure 5.1 depicts the ASON reference points between various optical networks and client networks (e.g., IP, asynchronous transfer mode [ATM], or Synchronous Optical Network/synchronous digital hierarchy [SONET/SDH] networks), which are connected via lightpaths. Specifically, the reference point between a client network and an administrative domain of an optical network is called user–network interface (UNI). The reference point between the administrative domains of two different optical networks is called external network–network interface (E-NNI). The reference point between two domains (e.g., routing areas), within the same administrative domain of an optical network is called internal network–network interface (I-NNI).
Multiprotocol label switching
The ASON framework may be viewed as a reference architecture for the control plane of optical switching networks. It is important to note that the framework addresses the ASON requirements but does not specify any control plane protocol. In transparent optical networks, such as ASON, intermediate optical add-drop multiplexers (OADMs) and optical cross-connects (OXCs) may be optically bypassed and thereby prevented from accessing the corresponding wavelength channels.
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- Optical Switching Networks , pp. 57 - 76Publisher: Cambridge University PressPrint publication year: 2008