def get_resources(cls):
        """Returns Ext Resources."""
        exts = []
        parent = dict(member_name=ciscohostingdevicemanager.DEVICE,
                      collection_name=ciscohostingdevicemanager.DEVICES)
        controller = resource.Resource(
            RouterHostingDeviceSchedulerController(), cb_faults.FAULT_MAP)
        exts.append(extensions.ResourceExtension(
            DEVICE_L3_ROUTERS, controller, parent, path_prefix="/dev_mgr"))
        parent = dict(member_name="router",
                      collection_name=l3_const.ROUTERS)
        controller = resource.Resource(
            HostingDevicesHostingRouterController(), cb_faults.FAULT_MAP)
        exts.append(extensions.ResourceExtension(L3_ROUTER_DEVICES, controller,
                                                 parent))
        return exts