diff --git a/metadata/service/nodes_flat.yml b/metadata/service/nodes_flat.yml
index d36fdbd..ef90931 100644
--- a/metadata/service/nodes_flat.yml
+++ b/metadata/service/nodes_flat.yml
@@ -1,6 +1,8 @@
 applications:
   - baremetal_simulator
 parameters:
+  _param:
+    openstack_baremetal_simulator_mac_vendor: "aa:bb:cc"
   ironic:
     client:
       enabled: true
@@ -22,8 +24,8 @@
               deploy_ramdisk: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_ramdisk_file}
               deploy_kernel: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_kernel_file}
             ports:
-              - address: aa:bb:cc:dd:00:00
-              - address: aa:bb:cc:dd:00:01
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:00:00"
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:00:01"
           - name: ${linux:network:hostname}-n1
             driver: pxe_ipmitool
             microversion: '1.9'
@@ -40,7 +42,7 @@
               deploy_ramdisk: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_ramdisk_file}
               deploy_kernel: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_kernel_file}
             ports:
-              - address: aa:bb:cc:dd:01:00
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:01:00"
             deployment_profile:
               network:
                 fixed_ips:
@@ -62,4 +64,4 @@
               deploy_ramdisk: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_ramdisk_file}
               deploy_kernel: http://${_param:single_baremetal_address}/${baremetal_simulator:deploy_kernel_file}
             ports:
-              - address: aa:bb:cc:dd:02:00
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:02:00"
diff --git a/metadata/service/nodes_neutron.yml b/metadata/service/nodes_neutron.yml
index 495813f..0e26a09 100644
--- a/metadata/service/nodes_neutron.yml
+++ b/metadata/service/nodes_neutron.yml
@@ -1,6 +1,8 @@
 applications:
   - baremetal_simulator
 parameters:
+  _param:
+    openstack_baremetal_simulator_mac_vendor: "aa:bb:cc"
   ironic:
     client:
       enabled: true
@@ -23,13 +25,13 @@
             network_interface: 'neutron'
             microversion: '1.20'
             ports:
-              - address: aa:bb:cc:dd:00:00
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:00:00"
                 local_link_connection:
                   switch_id: 00:00:00:00:00:00
                   switch_info: br-simulator
                   port_id: tap-bmt-n0i1
                 microversion: '1.19'
-              - address: aa:bb:cc:dd:00:01
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:00:01"
                 local_link_connection:
                   switch_id: 00:00:00:00:00:00
                   switch_info: br-simulator
@@ -52,7 +54,7 @@
             network_interface: 'neutron'
             microversion: '1.20'
             ports:
-              - address: aa:bb:cc:dd:01:00
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:01:00"
                 local_link_connection:
                   switch_id: 00:00:00:00:00:00
                   switch_info: br-simulator
@@ -80,7 +82,7 @@
             network_interface: 'neutron'
             microversion: '1.20'
             ports:
-              - address: aa:bb:cc:dd:02:00
+              - address: "${_param:openstack_baremetal_simulator_mac_vendor}:dd:02:00"
                 local_link_connection:
                   switch_id: 00:00:00:00:00:00
                   switch_info: br-simulator