This paper presents OCCI simulation extension, a generic simulator for any kind of resources. To achieve that, we first study the position of cloud simulator entities against OCCI model. Afterward, we define an OCCI extension simulation. In order to study the usefulness of this extension, we implement in the second time a module for Eclipse IDE to define OCCI configuration graphically. This tool uses the proposed extension. From the generated OCCI configuration, cloud resources are extracted and used by Cloud Sim simulator upon OCCI metamodel. Multiple experiments with different configuration were conducted to validate the generality of the proposed simulation extension.