Explicit Resource Allocation and Slicing Sample Clauses

Explicit Resource Allocation and Slicing. After the orchestrator has determined which resources should be allocated to a client to fulfil a request, it is necessary to reserve those resources. With respect to network devices, it is necessary to program flows that will determine their behaviour and set up the VDC. For this purpose, the orchestrator has to notify to the SDN controller the explicit resources to be configured. Within the VDC, it may be necessary for the client to program their own flows onto the devices that have been allocated and exposed for the given VDC instance. Table 3 summarizes the main interactions between the orchestrator and the SDN controller to achieve this purpose. Table 3 – Summary of interaction between the orchestrator and the SDN controller for VDC explicit resource allocation and slicing. Orchestrator required action/information and involved modules SDN service/request Information VDC provider VDC client -Neutron Enforce mapping between virtual and physical resources to establish a VDC instance -Virtual Infrastructure Manager URI POST/restconf/config/ virtual-infrastructure- manager:slice Slice: -TenantID -SliceID -Request details (topology, resources) Must be able to request any mapping between virtual and physical devices to construct VDC instances. NA -Neutron Eliminate a deployed VDC instance -Virtual Infrastructure Manager URI DELETE /restconf/config/virtua l-infrastructure- manager:slice Slice: -TenantID -SliceID Can eliminate any VDC instance tagged by <SliceID> from any tenant. Can only request for the elimination of the VDC instances tagged under his <TenantID>.
Sample 1
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Explicit Resource Allocation and Slicing. When the VDC service needs to allocate resources for the creation of a new VDC instance, it simply uses a POST operation to pass requests to the Virtual Infrastructure Manager at the ODL SDN controller, stating the desired characteristics of the VDC instance, such as bandwidth per virtual link, topology, etc. VDC provisioning requests are fulfilled by the manager allocating physical devices to the slice and programming the flows in order to construct the virtual network of the VDC instance. In this regard, the manager informs back to the VDC service with the characteristics of the successfully deployed slice. If there are insufficient optical resources to fulfil the request, the VDC service will be informed directly by the orchestrator (i.e. the Heat module) as it has overall visibility of the underlying physical structure, so no further communication with the control plane is required. For the case of eliminating an already deployed VDC instance, the VDC service will ask to the Virtual Infrastructure manager for the deletion of the slice passing both the slice and the tenant identifiers. Such action is triggered through a DELETE operation, which is consumed by the manager itself. Figure 12 depicts the interactions for both creation and elimination of a virtual slice in fulfilment of a VDC request.
Sample 1

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