# openstack network create --provider-network-type flat --provider-physical-network physnet1 --share provisionnet
# openstack subnet create  --network pxenet --subnet-range 192.168.21.0/24 --ip-version 4 --gateway 192.168.21.254 --allocation-pool start=192.168.21.22,end=192.168.21.28 --dhcp provisionsubnet
# openstack network create --provider-network-type flat --provider-physical-network physnet1 --share cleannet
# openstack subnet create  --network pxenet --subnet-range 10.21.21.0/24 --ip-version 4 --gateway 10.21.21.254 --allocation-pool start=10.21.21.22,end=10.21.21.28 --dhcp cleansubnet