diff --git a/roles/overcloud-prep-network/README.md b/roles/overcloud-prep-network/README.md
index 6a5bb14ca..2e0b757ce 100644
--- a/roles/overcloud-prep-network/README.md
+++ b/roles/overcloud-prep-network/README.md
@@ -1,27 +1,73 @@
 Role Name
 =========
 
-An Ansible role to copy configuration files to the undercloud prior to deployment.
+An Ansible role to copy configuration files to the undercloud prior to
+deployment.
 
 Requirements
 ------------
 
-This  playbook expects that the undercloud has been installed and setup using one of the roles relevant to baremetal overcloud deployments.
+This  playbook expects that the undercloud has been installed and setup using
+one of the roles relevant to baremetal overcloud deployments.
 
 Role Variables
 --------------
 
 **Note:** Make sure to include all environment file and options from your [initial Overcloud creation](https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/7/html/Director_Installation_and_Usage/sect-Scaling_the_Overcloud.html).
 
-- working_dir: <'/home/stack'> -- working directory for the role. Assumes stackrc file is present at this location
-- baremetal_instackenv: <"{{ working_dir }}/instackenv.json"> -- location of instackenv.json to copy over
-- baremetal_network_environment: <"{{ working_dir }}/network-isolation.yml"> -- location of network-environment file to copy over
-- undercloud_type: <virtual> -- can be overwritten with values like 'baremetal' or 'ovb'
+- working_dir: <'/home/stack'> -- working directory for the role. Assumes
+stackrc file is present at this location
+- baremetal_instackenv: <"{{ working_dir }}/instackenv.json"> -- location of
+instackenv.json to copy over
+- baremetal_network_environment: <"{{ working_dir }}/network-isolation.yml">
+-- location of network-environment file to copy over
+- undercloud_type: <virtual> -- can be overwritten with values like 'baremetal'
+ or 'ovb'
+- undercloud_networks: by default an external network is defined by
+  tripleo-quickstart, as follows:
+
+      undercloud_networks:
+        external:
+          address: "{{ undercloud_external_network_cidr|nthhost(1) }}"
+          netmask: "{{ undercloud_external_network_cidr|ipaddr('netmask') }}"
+          address6: "{{ undercloud_external_network_cidr6|nthhost(1) }}"
+          device_type: ovs
+          type: OVSIntPort
+          ovs_bridge: br-ctlplane
+          ovs_options: '"tag=10"'
+          tag: 10
+
+  But it is possible to override this, when specific vlan options are needed:
+
+      undercloud_networks:
+        external:
+          address: 172.20.0.254
+          netmask: 255.255.255.0
+          device_type: ovs
+          type: OVSIntPort
+          ovs_bridge: br-ctlplane
+          ovs_options: '"tag=1005"'
+          tag: 1005
+
+  Or when the external network on the undercloud is and ethernet device instead
+of a bridge:
+
+      undercloud_networks:
+        external:
+          address: 172.20.0.254
+          netmask: 255.255.255.0
+          device_type: ethernet
+          device_name: eth2
+
+  What makes the difference in this case is the *device_type* set to *ethernet*
+instead of *ovs* and the *device_name* which must be the name of the ethernet
+device on the undercloud.
 
 Dependencies
 ------------
 
-This playbook does not deploy the overcloud. After this playbook runs, call https://github.com/redhat-openstack/ansible-role-tripleo-overcloud.
+This playbook does not deploy the overcloud. After this playbook runs, call
+https://github.com/redhat-openstack/ansible-role-tripleo-overcloud.
 
 Example Playbook
 ----------------
diff --git a/roles/overcloud-prep-network/templates/overcloud-prep-network.sh.j2 b/roles/overcloud-prep-network/templates/overcloud-prep-network.sh.j2
index 0f5a80476..a7ff01730 100644
--- a/roles/overcloud-prep-network/templates/overcloud-prep-network.sh.j2
+++ b/roles/overcloud-prep-network/templates/overcloud-prep-network.sh.j2
@@ -38,7 +38,7 @@ echo "Please use 'single-nic-vlans' and 'bond-with-vlans'"
 {% endif %}
 {% for name, network in (undercloud_networks|default({})).items() if name == 'external' %}
 
-{% if not overcloud_ipv6|bool %}
+{% if not overcloud_ipv6|bool and network.device_type == 'ovs' %}
 sudo bash -c 'cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-vlan{{ network.tag }}
 DEVICE=vlan{{ network.tag }}
 ONBOOT=yes
@@ -53,6 +53,19 @@ EOF'
 
 sudo ifup ifcfg-vlan{{ network.tag }}
 
+{% elif not overcloud_ipv6|bool and network.device_type == 'ethernet' %}
+
+sudo bash -c 'cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-{{ network.device_name }}
+DEVICE={{ network.device_name }}
+ONBOOT=yes
+TYPE=Ethernet
+BOOTPROTO=static
+IPADDR={{ network.address }}
+NETMASK={{ network.netmask }}
+EOF'
+
+sudo ifup ifcfg-{{ network.device_name }}
+
 {% else %}
 
 sudo bash -c 'cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-eth6