Benefits for the Control Plane and Data plane layers Sample Clauses

Benefits for the Control Plane and Data plane layers. ‌ In legacy architectures, where an orchestrator layer is not present, the configuration of the VMs and the network is not done jointly, that is, with no shared knowledge between the two operations. This usually leads to underperformance of the DC infrastructure since most software solutions for the deployment of VMs only consider the load of the computing resources (i.e. the servers), with little to none regard to the actual network load, leading to potential network congestions. In this regard, the introduction of an orchestration layer is highly beneficial since it allows for the coordination of the configuration of all VDC resources (computing and networking) to reach an overall optimized utilization of the data plane resources. With this goal in mind, the COSIGN orchestrator has introduced a new Algorithms module whose purpose is to determine the mapping of VDC instances with the aim to optimize the data plane utilization. In this regard, the Algorithms module performs all the calculations necessary to decide the placement of the VMs onto the servers and the optical paths to be configured to satisfy the connectivity requirements of the virtual links. This joint calculation brings basically two main benefits: the first and most important one is the optimal utilization of the physical resources of the DC. By optimizing the usage of the physical resources, it is possible to increase the number of supported VDC instances on top of the shared DC infrastructure. The second benefit relates to the calculation of the optical paths. In a situation where the orchestrator is not present, the path calculation and configuration is made solely by the CP, which is responsible for the provisioning of the optical connectivity between servers. With the inclusion of the orchestrator plane, all calculations are made at the COSIGN orchestrator, so it lightens the computational burden of the CP which will only be an enforcer of the decisions taken at the orchestrator level. Additionally, the orchestrator allows for an automated and dynamic configuration of VDC instances, interacting with the CP as needed. We have demonstrated the automated VDC provisioning considering the whole COSIGN architecture (data, control and orchestrator planes) in [4], where we experimentally analysed the incurred delays in all layers for the provisioning of a single VDC instance. The obtained results confirmed that seamless VDC provisioning can be efficiently achieved at the COSIGN orchestrator, w...
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Benefits for the Control Plane and Data plane layers. ‌ In this section, we present the evaluation of vApp by both simulation and evaluation. The list below provides a detail on the tools and metrics that we have used for such evaluation: • Topologies: we evaluate vApp for two flat upper tier topologies: Ring and Flatted Butterfly [18]. Ring topology offers a simple wire connectivity, and is used by industrial DCNs. Facebook [19] presents a DCN architecture which uses Ring topology to connect the cluster and aggregation switches. Flattened butterfly (FBFly) takes advantage of high-radix switches to create a scalable, yet low-diameter network. Google [20] show that FBFly is a power efficient topology for high-performance DC networks. For both topologies, the bandwidth of the packet and circuit links are set for 1/10 ratio, as used by [21]. • We use two DCN traces to simulate aggregated traffic to the upper packet tier, with skewed and uniform traffic patterns.

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