General architecture of the COSIGN control Sample Clauses

General architecture of the COSIGN control plane The DC Control and Management layer is built upon Software Defined Networks (SDN) capabilities to leverage the added value of emerging optical technologies and aims to provide a converged network and IT virtualization platform for Data Centres. The DC Control and Management layer will result from the joint effort of WP3 and WP4, where WP3 will mostly focus on the DCN control aspects, while WP4 will address the whole DC management, including network, computing and storage resources, together with the orchestration of cloud services and applications. Figure 5 outlines the most important features and capabilities for each of the COSIGN architectural layers, with particular attention to the DCN Control Plane. These capabilities and how they relate to the internal CP components or to other COSIGN layers will be further discussed in the next sections. Figure 5. Functions and capabilities of COSIGN architectural layers In COSIGN architecture, the DCN Control Plane is placed between the DCN physical layer (WP2) and the DC Orchestration and Management plane (WP4), which is implemented through a cloud management platform (e.g. OpenStack). The cross-layer interaction is enabled through the northbound interface with the Orchestration and Management plane and the southbound interface with the DCN optical data plane. Considering a deployment where the CP functions are implemented in a centralized SDN controller (optionally with the contribution of some external SDN applications), these interfaces can be easily mapped respectively on the A-CPI and D-CPI interfaces defined in ONF (see section 2.3 for details). In this view, the DCN Control Plane can be considered as a sort of mediator between the optical hardware devices deployed at the DCN infrastructure and the software platform, running at the upper layer, which is in charge of coordinating the whole DC actions for the provisioning of cloud services. In this role, the control plane needs to ensure a twofold objective: • Translate the abstract network-related directives generated from the software cloud platform and enforce them through the actual configuration of the DCN data plane. • Guarantee the efficient utilization of the DCN data plane, in terms of features and capabilities, to provide the DC network connectivity required by the upper layer software cloud platform, in support of on-demand IaaS provisioning and DC management actions.
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