diff --git a/pillar/global/init.sls b/pillar/global/init.sls
index 5b174bf..c35306c 100644
--- a/pillar/global/init.sls
+++ b/pillar/global/init.sls
@@ -26,6 +26,10 @@ firewalld:
     public:
       short: Public
       {{ firewall_interfaces(public) }}
+    {%- if backend | length %}
+    backend:
+      {{ firewall_interfaces(backend) }}
+    {%- endif %}
 {%- endif %}
 
 mine_functions:
diff --git a/pillar/role/ha-node.sls b/pillar/role/ha-node.sls
index d52076a..137e1af 100644
--- a/pillar/role/ha-node.sls
+++ b/pillar/role/ha-node.sls
@@ -3,3 +3,6 @@ firewalld:
     internal:
       services:
         - vrrp
+    backend:
+      protocols:
+        - udp