Management and Realization of SLA for Providing Network QoS
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There is enormous potential of the Internet's growth if businesses can use it for their mission critical applications. But these applications can use the Internet only if it can provide service assurance. Recently Differentiated Services (DiffServ) architecture has been proposed to provide guarantee of QoS on the Internet and it is said to be more scalable than the earlier Integrated Services (IntServ) model. The DiffServ ensures guarantee of QoS on only a hop-by-hop or edge-to-edge basis. To provide end-to-end guarantee in DiffServ, a Bandwidth Broker (BB) framework has been proposed to perform admission control over DiffServ domains. In 1999, an initiative was taken by CKP/NGI 1 to provide a guarantee of end-to-end QoS for contents business over the Internet using Premium service (using EF PHB of DiffServ [3]). As part of this initiative, ENICOM 2 developed a BB and tested it on an experimental WAN in Japan. Since its creation, this BB has been continuously modified and enhanced to accommodate more services and standards. First, this paper provides a report of our BB, its implementation and deployment experience. Then we propose modifications in our design to incorporate recently proposed standards. We also describe experiments and simulations, which have been performed and those that are in the pipeline.