diff --git a/ansible/group_vars/all/inspector b/ansible/group_vars/all/inspector
index 7ea902da74c07892d9de93782c075149e1629f61..463f22ed22cbeee6eeceb18dfe183640d9cd82fe 100644
--- a/ansible/group_vars/all/inspector
+++ b/ansible/group_vars/all/inspector
@@ -58,7 +58,7 @@ inspector_ipmi_password: "{{ ipmi_password }}"
 
 # Ironic inspector default network interface name on which to check for an LLDP
 # switch port description to use as the node's name.
-inspector_lldp_switch_port_interface_default:
+inspector_lldp_switch_port_interface_default: eth0
 
 # Ironic inspector map from hostname to network interface name on which to
 # check for an LLDP switch port description to use as the node's name.
diff --git a/ansible/overcloud-introspection-rules.yml b/ansible/overcloud-introspection-rules.yml
index 2fbcc142bdca19c17fbb5329641dd545e59de694..f97bb67c3bf48d3aba210f568e4854849e36d2b4 100644
--- a/ansible/overcloud-introspection-rules.yml
+++ b/ansible/overcloud-introspection-rules.yml
@@ -49,6 +49,6 @@
       # These variables may be referenced in the introspection rules.
       inspector_rule_var_ipmi_username: "{{ inspector_ipmi_username }}"
       inspector_rule_var_ipmi_password: "{{ inspector_ipmi_password }}"
-      inspector_rule_var_lldp_switch_port_interface: "{{ inspector_lldp_switch_port_interface_default or '' }}"
+      inspector_rule_var_lldp_switch_port_interface: "{{ inspector_lldp_switch_port_interface_default }}"
       inspector_rule_var_deploy_kernel: "{{ ipa_kernel_id.stdout }}"
       inspector_rule_var_deploy_ramdisk: "{{ ipa_ramdisk_id.stdout }}"
diff --git a/ansible/seed-introspection-rules.yml b/ansible/seed-introspection-rules.yml
index 8d2f98a44c88fe3e6421e6942d2846abe7c158e4..1759e70a30372c09a7e6dc238958dfaba935aa04 100644
--- a/ansible/seed-introspection-rules.yml
+++ b/ansible/seed-introspection-rules.yml
@@ -12,6 +12,6 @@
       # These variables may be referenced in the introspection rules.
       inspector_rule_var_ipmi_username: "{{ kolla_bifrost_inspector_ipmi_username }}"
       inspector_rule_var_ipmi_password: "{{ kolla_bifrost_inspector_ipmi_password }}"
-      inspector_rule_var_lldp_switch_port_interface: "{{ kolla_bifrost_inspector_lldp_switch_port_interface or '' }}"
+      inspector_rule_var_lldp_switch_port_interface: "{{ kolla_bifrost_inspector_lldp_switch_port_interface }}"
       inspector_rule_var_deploy_kernel: "{{ kolla_bifrost_inspector_deploy_kernel }}"
       inspector_rule_var_deploy_ramdisk: "{{ kolla_bifrost_inspector_deploy_ramdisk }}"