Abstraction layer Sample Clauses

Abstraction layer. The abstraction layer provides a common and uniform access to the different optical devices deployed in the COSIGN hybrid data centre fabric, by means of a uniform DCN information model. Therefore, it creates and exposes a unified and protocol-independent set of commands and primitives to manage and configure the variety of optical technologies deployed in the data plane. This layer is implemented leveraging on the protocol-specific SDN drivers described above, each providing a per-technology and device-wide abstraction. On top of this first level of abstraction, a common DCN information model is built by this abstraction layer to fully expose to other SDN internal components (i.e. the core network functions) capabilities of heterogeneous optical technologies and devices to describe their features, actions supported and peer information (to build the topology). In particular, the COSIGN SDN Control Plane addresses the heterogeneity at the hybrid optical data plane following a two-fold approach. On the one end, it introduces extensions at the D-CPI protocols to exploit the specific capabilities and granularities of the different optical resources. On the other end, powerful abstraction models simplify the management of these resources within the SDN controller, using a unified information model for the whole DCN. This common DCN abstraction layer is a key component of the COSING SDN controller, and the main enabler of the SDN principles for deep programmability of network functionalities from the upper layers.
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