diff --git a/releasenotes/notes/bug-1978362-e2b878f5f6c61298.yaml b/releasenotes/notes/bug-1978362-e2b878f5f6c61298.yaml
new file mode 100644
index 000000000..09e881998
--- /dev/null
+++ b/releasenotes/notes/bug-1978362-e2b878f5f6c61298.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed an issue which caused RoleNetIpMap to have missing overcloud node IP
+    addresses when overcloud node hostname contain uppercase characters.
+    See bug: `1978362 <https://bugs.launchpad.net/tripleo/+bug/1978362>`_.
diff --git a/tripleo_ansible/ansible_plugins/modules/tripleo_overcloud_network_ports.py b/tripleo_ansible/ansible_plugins/modules/tripleo_overcloud_network_ports.py
index cb2829f6a..04362254f 100644
--- a/tripleo_ansible/ansible_plugins/modules/tripleo_overcloud_network_ports.py
+++ b/tripleo_ansible/ansible_plugins/modules/tripleo_overcloud_network_ports.py
@@ -424,7 +424,7 @@ def _unprovision_ports(result, conn, stack, instance, ironic_uuid):
 def generate_node_port_map(result, net_maps, ports_by_node):
     node_port_map = result['node_port_map']
     for hostname, ports in ports_by_node.items():
-        node = node_port_map[hostname] = dict()
+        node = node_port_map[hostname.lower()] = dict()
         for port in ports:
             if not port.fixed_ips:
                 continue