An approach for QoS constraint networks in cloud environments

Many QoS constraints in network environments exists, beginning with hard real time networks on the field bus level, up to Differentiated Services or VLAN tagging for commodity computer networks. However, all these approaches are not applicable for cloud-based environments, where networks need to be configured dynamically and on-demand. In this paper, we present an approach for centralized and dynamic network configuration. We show that QoS constraints can be fulfilled by decoupling the control and datapath of packet forwarding hardware in Ethernet based interconnection networks, that are widely-used in data centers and cloud environments. Furthermore, we introduce our cloud middleware and explain the resulting problems raised by interconnecting virtualized embedded systems through overlay networks with QoS constraints coming from the field bus domain.