If you want to create a network on openstack with static IP (without DHCP & Subnet) cause you have an external DHCP Server, you can use this.
- We want to create an external network named 
VLANAXS205withphysnet1as Interface name &205as VLAN ID 
openstack network create \
  --provider-network-type vlan \
  --provider-physical-network physnet1 \
  --provider-segment 205 \
  --share \
  --disable-port-security \
  VLANAXS205
openstack port create \
  --network VLANAXS205 \
  --no-fixed-ip \
  --no-security-group \
  --disable-port-security \
  vlanaxs205-port2
openstack server add port 75bf5539-9e01-4d1a-9ac6-cf5df177b5db vlanaxs205-port2