diff --git a/lib/neutron b/lib/neutron
index bdd4aeedb8..f72ee5934f 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -492,9 +492,9 @@ function create_neutron_initial_network {
         sudo ifconfig $OVS_PHYSICAL_BRIDGE up
         sudo route add default gw $NETWORK_GATEWAY dev $OVS_PHYSICAL_BRIDGE
     elif is_provider_network; then
-        die_if_not_set $LINENO SEGMENTATION_ID "A SEGMENTATION_ID is required to use provider networking"
+        die_if_not_set $LINENO PHYSICAL_NETWORK "You must specify the PHYSICAL_NETWORK"
         die_if_not_set $LINENO PROVIDER_NETWORK_TYPE "You must specifiy the PROVIDER_NETWORK_TYPE"
-        NET_ID=$(neutron net-create $PHYSICAL_NETWORK --tenant_id $TENANT_ID --provider:network_type $PROVIDER_NETWORK_TYPE --provider:physical_network "$PHYSICAL_NETWORK" --provider:segmentation_id "$SEGMENTATION_ID" --shared | grep ' id ' | get_field 2)
+        NET_ID=$(neutron net-create $PHYSICAL_NETWORK --tenant_id $TENANT_ID --provider:network_type $PROVIDER_NETWORK_TYPE --provider:physical_network "$PHYSICAL_NETWORK" ${SEGMENTATION_ID:+--provider:segmentation_id $SEGMENTATION_ID} --shared | grep ' id ' | get_field 2)
         SUBNET_ID=$(neutron subnet-create --tenant_id $TENANT_ID --ip_version 4 ${ALLOCATION_POOL:+--allocation-pool $ALLOCATION_POOL} --name $PROVIDER_SUBNET_NAME $NET_ID $FIXED_RANGE | grep ' id ' | get_field 2)
         SUBNET_V6_ID=$(neutron subnet-create --tenant_id $TENANT_ID --ip_version 6 --ipv6-address-mode slaac --gateway $V6_NETWORK_GATEWAY --name $PROVIDER_SUBNET_NAME_V6 $NET_ID $FIXED_RANGE_V6 | grep 'id' | get_field 2)
         sudo ip link set $OVS_PHYSICAL_BRIDGE up