diff --git a/tcp_tests/templates/virtual-mcp-sl-os/underlay.yaml b/tcp_tests/templates/virtual-mcp-sl-os/underlay.yaml
new file mode 100644
index 0000000..955750b
--- /dev/null
+++ b/tcp_tests/templates/virtual-mcp-sl-os/underlay.yaml
@@ -0,0 +1,510 @@
+# Set the repository suite, one of the: 'nightly', 'testing', 'stable', or any other required
+{% set REPOSITORY_SUITE = os_env('REPOSITORY_SUITE', 'testing') %}
+
+{% import 'virtual-mcp-sl-os/underlay--meta-data.yaml' as CLOUDINIT_META_DATA with context %}
+{% import 'virtual-mcp-sl-os/underlay--user-data-cfg01.yaml' as CLOUDINIT_USER_DATA_CFG01 with context %}
+{% import 'virtual-mcp-sl-os/underlay--user-data1604.yaml' as CLOUDINIT_USER_DATA_1604 with context %}
+
+---
+aliases:
+ - &interface_model {{ os_env('INTERFACE_MODEL', 'virtio') }}
+ - &cloudinit_meta_data {{ CLOUDINIT_META_DATA }}
+ - &cloudinit_user_data_cfg01 {{ CLOUDINIT_USER_DATA_CFG01 }}
+ - &cloudinit_user_data_1604 {{ CLOUDINIT_USER_DATA_1604 }}
+
+{% set LAB_CONFIG_NAME = os_env('LAB_CONFIG_NAME', 'virtual-mcp-sl-os') %}
+{% set DOMAIN_NAME = os_env('DOMAIN_NAME', LAB_CONFIG_NAME) + '.local' %}
+{% set HOSTNAME_CFG01 = os_env('HOSTNAME_CFG01', 'cfg01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CTL01 = os_env('HOSTNAME_CTL01', 'ctl01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CTL02 = os_env('HOSTNAME_CTL02', 'ctl02.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CTL03 = os_env('HOSTNAME_CTL03', 'ctl03.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CMP01 = os_env('HOSTNAME_CMP01', 'cmp01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_CMP02 = os_env('HOSTNAME_CMP02', 'cmp02.' + DOMAIN_NAME) %}
+{% set HOSTNAME_MON01 = os_env('HOSTNAME_MON01', 'mon01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_MON02 = os_env('HOSTNAME_MON02', 'mon02.' + DOMAIN_NAME) %}
+{% set HOSTNAME_MON03 = os_env('HOSTNAME_MON03', 'mon03.' + DOMAIN_NAME) %}
+{% set HOSTNAME_GTW01 = os_env('HOSTNAME_GTW01', 'gtw01.' + DOMAIN_NAME) %}
+{% set HOSTNAME_PRX01 = os_env('HOSTNAME_PRX01', 'prx01.' + DOMAIN_NAME) %}
+
+template:
+  devops_settings:
+    env_name: {{ os_env('ENV_NAME', 'virtual-mcp-sl-os_' + REPOSITORY_SUITE + "_" + os_env('BUILD_NUMBER', '')) }}
+
+    address_pools:
+      private-pool01:
+        net: {{ os_env('PRIVATE_ADDRESS_POOL01', '10.60.0.0/16:24') }}
+        params:
+          ip_reserved:
+            gateway: +1
+            l2_network_device: +1
+            default_{{ HOSTNAME_CFG01 }}: +100
+            default_{{ HOSTNAME_CTL01 }}: +101
+            default_{{ HOSTNAME_CTL02 }}: +102
+            default_{{ HOSTNAME_CTL03 }}: +103
+            default_{{ HOSTNAME_CMP01 }}: +105
+            default_{{ HOSTNAME_CMP02 }}: +106
+            default_{{ HOSTNAME_MON01 }}: +107
+            default_{{ HOSTNAME_MON02 }}: +108
+            default_{{ HOSTNAME_MON03 }}: +109
+            default_{{ HOSTNAME_GTW01 }}: +110
+            default_{{ HOSTNAME_PRX01 }}: +121
+          ip_ranges:
+            dhcp: [+90, -10]
+
+      admin-pool01:
+        net: {{ os_env('ADMIN_ADDRESS_POOL01', '10.70.0.0/16:24') }}
+        params:
+          ip_reserved:
+            gateway: +1
+            l2_network_device: +1
+            default_{{ HOSTNAME_CFG01 }}: +90
+            default_{{ HOSTNAME_CTL01 }}: +101
+            default_{{ HOSTNAME_CTL02 }}: +102
+            default_{{ HOSTNAME_CTL03 }}: +103
+            default_{{ HOSTNAME_CMP01 }}: +105
+            default_{{ HOSTNAME_CMP02 }}: +106
+            default_{{ HOSTNAME_MON01 }}: +107
+            default_{{ HOSTNAME_MON02 }}: +108
+            default_{{ HOSTNAME_MON03 }}: +109
+            default_{{ HOSTNAME_GTW01 }}: +110
+            default_{{ HOSTNAME_PRX01 }}: +121
+          ip_ranges:
+            dhcp: [+90, -10]
+
+      tenant-pool01:
+        net: {{ os_env('TENANT_ADDRESS_POOL01', '10.80.0.0/16:24') }}
+        params:
+          ip_reserved:
+            gateway: +1
+            l2_network_device: +1
+            default_{{ HOSTNAME_CFG01 }}: +100
+            default_{{ HOSTNAME_CTL01 }}: +101
+            default_{{ HOSTNAME_CTL02 }}: +102
+            default_{{ HOSTNAME_CTL03 }}: +103
+            default_{{ HOSTNAME_CMP01 }}: +105
+            default_{{ HOSTNAME_CMP02 }}: +106
+            default_{{ HOSTNAME_MON01 }}: +107
+            default_{{ HOSTNAME_MON02 }}: +108
+            default_{{ HOSTNAME_MON03 }}: +109
+            default_{{ HOSTNAME_GTW01 }}: +110
+            default_{{ HOSTNAME_PRX01 }}: +121
+          ip_ranges:
+            dhcp: [+10, -10]
+
+      external-pool01:
+        net: {{ os_env('EXTERNAL_ADDRESS_POOL01', '10.90.0.0/16:24') }}
+        params:
+          ip_reserved:
+            gateway: +1
+            l2_network_device: +1
+            default_{{ HOSTNAME_CFG01 }}: +100
+            default_{{ HOSTNAME_CTL01 }}: +101
+            default_{{ HOSTNAME_CTL02 }}: +102
+            default_{{ HOSTNAME_CTL03 }}: +103
+            default_{{ HOSTNAME_CMP01 }}: +105
+            default_{{ HOSTNAME_CMP02 }}: +106
+            default_{{ HOSTNAME_MON01 }}: +107
+            default_{{ HOSTNAME_MON02 }}: +108
+            default_{{ HOSTNAME_MON03 }}: +109
+            default_{{ HOSTNAME_GTW01 }}: +110
+            default_{{ HOSTNAME_PRX01 }}: +121
+          ip_ranges:
+            dhcp: [+10, -10]
+
+
+    groups:
+      - name: default
+        driver:
+          name: devops.driver.libvirt
+          params:
+            connection_string: !os_env CONNECTION_STRING, qemu:///system
+            storage_pool_name: !os_env STORAGE_POOL_NAME, default
+            stp: False
+            hpet: False
+            enable_acpi: true
+            use_host_cpu: !os_env DRIVER_USE_HOST_CPU, true
+            use_hugepages: !os_env DRIVER_USE_HUGEPAGES, false
+
+        network_pools:
+          admin: admin-pool01
+          private: private-pool01
+          tenant: tenant-pool01
+          external: external-pool01
+
+        l2_network_devices:
+          private:
+            address_pool: private-pool01
+            dhcp: true
+
+          admin:
+            address_pool: admin-pool01
+            dhcp: true
+            forward:
+              mode: nat
+
+          tenant:
+            address_pool: tenant-pool01
+            dhcp: true
+
+          external:
+            address_pool: external-pool01
+            dhcp: true
+            forward:
+              mode: nat
+
+
+        group_volumes:
+         - name: cloudimage1604    # This name is used for 'backing_store' option for node volumes.
+           source_image: !os_env IMAGE_PATH1604  # https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img
+           format: qcow2
+         - name: cfg01_day01_image               # Pre-configured day01 image
+           source_image: {{ os_env('IMAGE_PATH_CFG01_DAY01', os_env('IMAGE_PATH1604')) }} # http://images.mirantis.com/cfg01-day01.qcow2 or fallback to IMAGE_PATH1604
+           format: qcow2
+
+        nodes:
+          - name: {{ HOSTNAME_CFG01 }}
+            role: salt_master
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 2
+              memory: !os_env SLAVE_NODE_MEMORY, 4096
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cfg01_day01_image
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_cfg01
+
+              interfaces:
+                - label: ens3
+                  l2_network_device: admin
+                  interface_model: *interface_model
+                - label: ens4
+                  l2_network_device: private
+                  interface_model: *interface_model
+              network_config:
+                ens3:
+                  networks:
+                    - admin
+                ens4:
+                  networks:
+                    - private
+
+          - name: {{ HOSTNAME_CTL01 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 2
+              memory: !os_env SLAVE_NODE_MEMORY, 12288
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: cinder
+                  capacity: 50
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: &interfaces
+                - label: ens3
+                  l2_network_device: admin
+                  interface_model: *interface_model
+                - label: ens4
+                  l2_network_device: private
+                  interface_model: *interface_model
+              network_config: &network_config
+                ens3:
+                  networks:
+                    - admin
+                ens4:
+                  networks:
+                    - private
+
+          - name: {{ HOSTNAME_CTL02 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 2
+              memory: !os_env SLAVE_NODE_MEMORY, 12288
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: cinder
+                  capacity: 50
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_CTL03 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 2
+              memory: !os_env SLAVE_NODE_MEMORY, 12288
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: cinder
+                  capacity: 50
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_MON01 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 3
+              memory: !os_env SLAVE_NODE_MEMORY, 2048
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_MON02 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 3
+              memory: !os_env SLAVE_NODE_MEMORY, 2048
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_MON03 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 3
+              memory: !os_env SLAVE_NODE_MEMORY, 2048
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_PRX01 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 1
+              memory: !os_env SLAVE_NODE_MEMORY, 2048
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: cinder
+                  capacity: 50
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *interfaces
+              network_config: *network_config
+
+          - name: {{ HOSTNAME_CMP01 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 3
+              memory: !os_env SLAVE_NODE_MEMORY, 4096
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+
+              interfaces: &all_interfaces
+                - label: ens3
+                  l2_network_device: admin
+                  interface_model: *interface_model
+                - label: ens4
+                  l2_network_device: private
+                  interface_model: *interface_model
+                - label: ens5
+                  l2_network_device: tenant
+                  interface_model: *interface_model
+                - label: ens6
+                  l2_network_device: external
+                  interface_model: *interface_model
+              network_config: &all_network_config
+                ens3:
+                  networks:
+                    - admin
+                ens4:
+                  networks:
+                    - private
+                ens5:
+                  networks:
+                    - tenant
+                ens6:
+                  networks:
+                    - external
+
+          - name: {{ HOSTNAME_CMP02 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 3
+              memory: !os_env SLAVE_NODE_MEMORY, 4096
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *all_interfaces
+              network_config: *all_network_config
+
+          - name: {{ HOSTNAME_GTW01 }}
+            role: salt_minion
+            params:
+              vcpu: !os_env SLAVE_NODE_CPU, 1
+              memory: !os_env SLAVE_NODE_MEMORY, 2048
+              boot:
+                - hd
+              cloud_init_volume_name: iso
+              cloud_init_iface_up: ens3
+              volumes:
+                - name: system
+                  capacity: !os_env NODE_VOLUME_SIZE, 150
+                  backing_store: cloudimage1604
+                  format: qcow2
+                - name: iso  # Volume with name 'iso' will be used
+                             # for store image with cloud-init metadata.
+                  capacity: 1
+                  format: raw
+                  device: cdrom
+                  bus: ide
+                  cloudinit_meta_data: *cloudinit_meta_data
+                  cloudinit_user_data: *cloudinit_user_data_1604
+
+              interfaces: *all_interfaces
+              network_config: *all_network_config