diff --git a/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml b/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
index 867cac1..5ee6958 100644
--- a/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
+++ b/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
@@ -14,7 +14,8 @@
  - &cloudinit_user_data_1604 {{ CLOUDINIT_USER_DATA_1604 }}
  - &cloudinit_user_data_1404 {{ CLOUDINIT_USER_DATA_1404 }}
 
-{% set DOMAIN_NAME = os_env('LAB_CONFIG_NAME', 'virtual-mcp10-contrail') + '.local' %}
+{% set LAB_CONFIG_NAME = os_env('LAB_CONFIG_NAME', 'virtual-mcp10-contrail') %}
+{% 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) %}