The virtual machine in the main cloud and the child cloud should be able to communicate with each other. The VMs should have the capacity to provision instantly for the client requests. This ensures an immediate response of the cloud providers to the client subscriptions even during the failure of the main cloud resource.
A necessary communication link is provided between the virtual machines, so that the information from the main cloud can be updated instantly to the child cloud. The conceptual architecture of the child cloud model is shown in the Fig 1.