The talk presents the Siemens intra-domain Bandwidth Broker prototype. The prototype is based on the DiffServ Architecture. Our Bandwith Broker controls and configures edge routers of a DiffServ domain and offers a flexible and customized QoS interface to hosts and applications on these hosts for reservation of prioritized IP flows. The QoS Interface allows for reverse allocation and is easy to integrate in existing applications.

We will show that CORBA is a suitable middleware for implementing QoS interfaces.

The talk will also present our concepts for extending our prototype to an inter-domain Bandwidth Broker. A two-layered architecture with a well-defined worksplit between resource management and admission control will be shown. The architecture will scale for large DiffServ domains and inter-domain scenarios, and the distributed admission control avoids a single point of failure.