/spl mu/ service level agreement: a new bandwidth guarantee of flow-level granularity in internet VPN

In this paper, we propose a QoS-enabled VPN architecture supporting a new service level agreement (SLA), called mu SLA to allow customer to specify QoS requirement. Such a QoS requirement is in terms of VPN total bandwidth and real-time micro-flow bandwidth. The proposed architecture is based on VPN hose model over DiffServ network and on logical bandwidth partitions at edge routers into various classes of micro-flow aggregations. State information of micro-flow at edge routers provides fine granularity of QoS control. A dynamic bandwidth prediction technique, normalized least mean square error (NLMS) linear predictor, is used to help the efficient resource sharing between real-time and best-effort services within each VPN. Simulation results done by network simulator 2 (NS-2) show that the proposed architecture guarantees VPN real-time micro-flows with bandwidth and quality improvement