diff --git a/src/config/api-server/vnc_cfg_ifmap.py b/src/config/api-server/vnc_cfg_ifmap.py
index e53ce423fc1..71677a2ad88 100644
--- a/src/config/api-server/vnc_cfg_ifmap.py
+++ b/src/config/api-server/vnc_cfg_ifmap.py
@@ -1510,17 +1510,23 @@ def match_uuid(self, obj_dict, obj_uuid):
         return False
     # end match_uuid
 
-    def _update_subnet_uuid(self, vn_dict):
-        vn_uuid = vn_dict['uuid']
+    def update_subnet_uuid(self, vn_dict, do_update=False):
+        vn_uuid = vn_dict.get('uuid')
 
-        def _get_subnet_key(subnet):
+        def _read_subnet_uuid(subnet):
+            if vn_uuid is None:
+                return None
             pfx = subnet['subnet']['ip_prefix']
             pfx_len = subnet['subnet']['ip_prefix_len']
 
             network = IPNetwork('%s/%s' % (pfx, pfx_len))
-            return '%s %s/%s' % (vn_uuid, str(network.ip), pfx_len)
+            subnet_key = '%s %s/%s' % (vn_uuid, str(network.ip), pfx_len)
+            try:
+                return self.useragent_kv_retrieve(subnet_key)
+            except NoUserAgentKey:
+                return None
 
-        ipam_refs = vn_dict['network_ipam_refs']
+        ipam_refs = vn_dict.get('network_ipam_refs', [])
         updated = False
         for ipam in ipam_refs:
             vnsn = ipam['attr']
@@ -1529,15 +1535,15 @@ def _get_subnet_key(subnet):
                 if subnet.get('subnet_uuid'):
                     continue
 
-                subnet_key = _get_subnet_key(subnet)
-                subnet_uuid = self.useragent_kv_retrieve(subnet_key)
+                subnet_uuid = _read_subnet_uuid(subnet) or str(uuid.uuid4())
                 subnet['subnet_uuid'] = subnet_uuid
                 if not updated:
                     updated = True
 
-        if updated:
-            self._cassandra_db._cassandra_virtual_network_update(vn_uuid, vn_dict)
-    # end _update_subnet_uuid
+        if updated and do_update:
+            self._cassandra_db._cassandra_virtual_network_update(vn_uuid,
+                                                                 vn_dict)
+    # end update_subnet_uuid
 
     def _dbe_resync(self, obj_uuid, obj_cols):
         obj_type = None
@@ -1558,7 +1564,7 @@ def _dbe_resync(self, obj_uuid, obj_cols):
 
             if (obj_type == 'virtual_network' and
                 'network_ipam_refs' in obj_dict):
-                self._update_subnet_uuid(obj_dict)
+                self._update_subnet_uuid(obj_dict, do_update=True)
         except Exception as e:
             self.config_object_error(
                 obj_uuid, None, obj_type, 'dbe_resync:cassandra_read', str(e))
diff --git a/src/config/api-server/vnc_cfg_types.py b/src/config/api-server/vnc_cfg_types.py
index f20a35f6e21..54502cb39f6 100644
--- a/src/config/api-server/vnc_cfg_types.py
+++ b/src/config/api-server/vnc_cfg_types.py
@@ -366,17 +366,6 @@ def _check_route_targets(cls, obj_dict, db_conn):
         return (True, '')
     # end _check_route_targets
 
-    @classmethod
-    def _check_and_create_subnet_uuid(cls, vn_dict):
-        ipam_refs = vn_dict.get('network_ipam_refs', [])
-        for ipam in ipam_refs:
-            vnsn = ipam['attr']
-            subnets = vnsn['ipam_subnets']
-            for subnet in subnets:
-                if not subnet.get('subnet_uuid'):
-                    subnet['subnet_uuid'] = str(uuid.uuid4())
-    # end _check_and_create_subnet_uuid
-
     @classmethod
     def http_post_collection(cls, tenant_name, obj_dict, db_conn):
         try:
@@ -396,7 +385,7 @@ def http_post_collection(cls, tenant_name, obj_dict, db_conn):
             if not ok:
                 return (False, (403, pformat(obj_dict['fq_name']) + ' : ' + quota_limit))
 
-        cls._check_and_create_subnet_uuid(obj_dict)
+        db_conn.update_subnet_uuid(obj_dict)
 
         (ok, error) =  cls._check_route_targets(obj_dict, db_conn)
         if not ok:
@@ -453,7 +442,7 @@ def http_put(cls, id, fq_name, obj_dict, db_conn):
         except Exception as e:
             return (False, (500, str(e)))
 
-        cls._check_and_create_subnet_uuid(obj_dict)
+        db_conn.update_subnet_uuid(obj_dict)
 
         (ok, error) =  cls._check_route_targets(obj_dict, db_conn)
         if not ok: