Navigation and service


Path Allocation in Backbone Networks

The convergence of telecommunication systems and data networks requires services beyond what is currently provided as Best-Effort service by the Internet. The most recent approach of the Internet Engineering Task Force towards network Quality of Service is the Differentiated Services framework, which defines an architecture for implementing scalable service differentiation in the existing Internet by an aggregation of flows to a small number of different traffic classes.

Differentiated Services can be complemented by Traffic Engineering, which is of special interest, if not only a relative differentiation between services shall be implemented, but, if absolute service guarantees need to be given. Here Multi-Protocol Label Switching is applied for this purpose. Multi-Protocol Label Switching is based on a functional decomposition of the network layer into a control component and a forwarding component. This distinction gives a number of options for the implementation of the control component.

One of these options is the use of a centralized network management entity, the so called Bandwidth Broker. Such a Bandwidth Broker can implement an explicit routing of sensitive aggregates by establishing certain Label Switched Paths between points of interest, whereas common Best-Effort traffic can remain under the control of the implicit routing by a standard routing protocol such as Open Shortest Path First. The General-purpose Architecture for Reservation and Allocation implements an advance reservation framework using heterogeneous resource ensembles and it includes a Differentiated Services reservation manager, which allows to use it as a Bandwidth Broker to apply Differentiated Services Traffic Engineering based on Multi-Protocol Label Switching.

This project addresses the issue how Multi-Protocol Label Switching can be used to allow for an on demand transportation of aggregates belonging to a small number of different service classes within the German Research Network.


Aachen University of Technology (RWTH Aachen), Department of Computer Science 4, Germany

Forschungszentrum Jülich GmbH, Jülich Supercomputing Centre, Germany
the contact person is Daniel Mallmann

The project is funded by the Verein zur Förderung eines Deutschen Forschungsnetzes e.V. (DFN).

The grant period is March 2002 until February 2004.

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Details can be found in the project's final report.