DCN infrastructure Sample Clauses

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DCN infrastructure. The DCN infrastructure information model is an uniform model exposed by the abstraction layer for both internal SDN controller modules and external applications and it is used to provide information about the DCN capabilities. The main objective of the abstraction layer is to provide an homogenous view of the DCN infrastructure to facilitate the management and control of the heterogeneous devices and technologies that compose the data plane. To achieve an information model that is generic enough to cope with all the technologies involved in the DCN, we need to simplify the elements and parameters to be used. In this context, at the most simplified view, the DCN can be seen as a set of nodes and links, which are deployed in a specific topology. Hence, in a first phase of the information model, the topology element defines the nodes and links composing the DCN. Then, the nodes provide an abstraction of the different switching devices that can be found in the data plane (e.g. ToRs, optical switches, etc.). Finally, the links connect the different nodes into the given topology. The number of nodes and links characterize the topology element. The nodes may be further divided into different classes according to the role they play in the DCN but, in a first stage, all of them need to keep common attributes such as the number and type of ports. For the links, bandwidth and occupancy attributes are needed. The DCN information model is typically used in read-write mode from some of the internal modules of the SDN controller, since they may need to operate and configure somehow the DCN itself. However, the REST APIs towards external entities may reduce the access to read-only operations. This is typically the case of the cloud management platform, which may need to collect information related to the DCN capabilities for taking internal decisions about cloud service scheduling or VM locations. However, the cloud platform itself is not allowed to operate directly on the DCN (i.e. with writing access on DCN resources), but needs the mediation of other DCN Control Plane services. They will be responsible to configure the DCN while providing higher level APIs to create virtual network slices for IaaS provisioning or end-to-end intra-DC connections to enable DC management procedures.
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