Comment 4 for bug 1562887

I am not sure whether it is a Rally bug. I doubt the JSON has been configured correctly based on requirements.

@Ann- Could you kindly put up the JSON you used for running?

@LIU Yulong- Rally DOES give an option of specifying the starting CIDR as well as the exact subnet CIDR for a subnets created.
You can either specify start_cidr for subnets creation (https://github.com/openstack/rally/blob/master/samples/tasks/scenarios/neutron/create_and_delete_routers.json#L7) or mention the exact CIDR for subnet in subnet_create_args (https://github.com/openstack/rally/blob/master/samples/tasks/scenarios/neutron/create_and_delete_routers.json#L6)