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Enterprises want their in-cloud services to leverage the performance andsecurity benefits that middleboxes offer in traditional deployments. Suchvirtualized deployments create new opportunities (e.g., flexible scaling) aswell as new challenges (e.g., dynamics, multiplexing) for middlebox managementtasks such as service composition and provisioning. Unfortunately, enterpriseslack systematic tools to efficiently compose and provision in-the-cloudmiddleboxes and thus fall short of achieving the benefits that cloud-baseddeployments can offer. To this end, we present the design and implementation ofStratos, an orchestration layer for virtual middleboxes. Stratos providesefficient and correct composition in the presence of dynamic scaling viasoftware-defined networking mechanisms. It ensures efficient and scalableprovisioning by combining middlebox-specific traffic engineering, placement,and horizontal scaling strategies. We demonstrate the effectiveness of Stratosusing an experimental prototype testbed and large-scale simulations.

Stratos: A Network-Aware Orchestration Layer for Virtual Middleboxes in Clouds