Optical answers to grid questions
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OPTICAL ANSWERS TO GRID QUESTIONS. Karen McPherson C.S. Major Radford University. SOURCE. “Grid-Controlled Lightpaths for High Performance Grid Applications"

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Presentation Transcript


Karen McPherson

C.S. Major

Radford University


  • “Grid-Controlled Lightpaths for High Performance Grid Applications"

  • Authors: Raouf Boutaba, Wojciech Golab, Youssef Iraqi, Tianshu Li, and Bill St. Arnaud published by Kluwer Academic Publishers, 2004.

  • Information as well as quoted material is from this source.


  • Definitions

  • Introduction

  • Architecture

  • Security

  • Conclusion

  • Q & A


  • Wavelength Division Multiplexing: Technology by which optical lines are divided for traffic by wavelength

  • Dark fiber: Installed but unused fiber-optic cable

  • Lightpath Object: An abstraction of one or more lightpaths representing a connection between two or more switches


  • Question: What is the best network support for the data intensive nature of grids?

  • Answer: Optical networks

Capacity & Cost

  • Optical networks provide the speed, reliability, and capacity ideal for huge data transfer

  • Emergence of new technologies such as WDM reduces cost of implementation

  • Existence of a great deal of currently available dark fiber reduces costs further

  • Problem: Existing optical resource management systems – implemented over the internet - are too slow and unreliable

  • Solution: “User-Controlled Lightpath Management System”



Grid Application

User Access Layer

Service Provisioning Layer

Resource Management Layer

Physical Layer

Cross-connect devices and lightpaths


Figure 1. The User Controlled Lightpath Management System is represented by three main layers: User Access Layer (UAL), Service Provisioning Layer (SPL), and the Resource Management Layer (RML)

User Access Layer (UAL)

  • Uses an HTML interface

  • Incorporates many XML and web based tools by implementing Java Web Services Developer Pack from Sun Microsystems

  • Main role is to translate user requests into operations on the services in the Service Provisioning Layer

Service Provisioning Layer (SPL)

  • Consists of Globus Toolkit 3.0 and JBoss application server

  • XML based framework – application / platform independence

  • Maintains information on LPOs and users in a relational database

  • Main role is to provide services by manipulating Lightpath Objects (LPO)

Resource Management Layer (RML)

  • Each cross-connect device is represented by a “Resource Agent”

  • Main role is to provide control over the individual devices

  • Incorporates the ability to customize system control with Java byte code

    • For example: creating your own monitoring policies

SPL Services

  • These services - provided as grid services - manage the LPO resources

  • A Lightpath Object is just that – an object. It contains fields for:

    • a unique ID

    • the IDs of the current and previous owner

    • advertisement and lease expiry dates

    • a status indicating whether the LPO is reserved for use by the owner or has been advertised, partitioned, or concatenated and

    • bandwidth in kbps

    • hardware parameters

SPL Services (cont)

  • CreateRootLPO: This is the basic service managed by the appropriate administrators and utilizes the root LPOs mentioned in the previous section

  • AdvertiseLPO and LeaseLPO: Ownership of lightpaths is transferred by means of “leasing”

  • PartitionLPO and ConcatenateLPO: These services are key in creating division and formation of lightpath bandwidths

SPL Services (cont)

  • AccessLPO: This service prepares a particular path for data traffic

  • ReconfigureLPO: This service is used for lightpath access policy control

  • EstablishEndToEndLPO: This service uses those above to form lightpaths, i.e., forming a path of a specific bandwidth between specific endpoints


  • The foundation of the security defense presented by this research is achieved by capitalizing on the Grid Security Infrastructure (GSI) supplied by Globus Toolkit 3.0

GSI Security

  • mutual authentication - based on public key encryption and Secure Socket Layer

  • transport layer security - httpg

  • message layer security - XML encryption

Custom Security

  • GSI insufficient to deal with user privileges in this lightpath management system

  • Researches implemented an additional, separate authorization mechanism

  • Implementing their own control allowed the researchers to add a customization feature to this authorization.


  • The solution offered by “Grid-Controlled Lightpaths for High Performance Grid Applications” does appear to confirm optical answers to grid questions

  • The solution delivers grid level data transfer at a realistic cost

  • The management offered by this research also seems to address grid needs - by using a “grid-centric” approach such as the services provided in the SPL, this system may be utilized by grid applications in a very innate way

Q & A

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