diff --git a/config-models/aether-2.0.x/files/yang/onf-aether-types.yang b/config-models/aether-2.0.x/files/yang/onf-aether-types.yang
index e0d655d..5e6fbfd 100755
--- a/config-models/aether-2.0.x/files/yang/onf-aether-types.yang
+++ b/config-models/aether-2.0.x/files/yang/onf-aether-types.yang
@@ -189,4 +189,23 @@
       description "long description field";
     }
   }
+
+  typedef ipv4-subnet {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      + '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+      + '(/([0-9]|[1-2][0-9]|3[0-2]))';      
+    }
+    description "IPv4 network in CIDR notation";
+  }
+
+  typedef host-or-network {
+    type union {
+      type inet:host;
+      type ipv4-subnet;
+    }
+    description "hostname, ip-address, or network";
+  } 
 }
+ 
\ No newline at end of file