Core Network Functions Sample Clauses

Core Network Functions. The core network functions are those components of the COSIGN SDN controller which provide the basic internal functions to manage DCN resources and offer the COSIGN Control Plane services discussed in section 3.2. The whole set of these network functions composes the infrastructure control layer of the COSIGN Control Plane architecture: it includes elementary blocks like topology inventory, path computation, reliable provisioning and monitoring. In order to support the enhanced features required by COSIGN use-cases (see section 3.6 for a mapping between CP functions and components), these blocks are properly extended or new ones are introduced as internal modules of the COSIGN SDN controller. They cooperate together to establish connection paths and compose isolated virtual infrastructures coexisting over the same DCN physical topology, following the network virtualization model based on the on DCN fabric programming. Typically, these functions are implemented as internal modules of the SDN controller and export REST API towards upper layer applications. The following table lists the COSIGN SDN controller core network functions and a brief description is provided for each one.