diff --git a/saharaclient/api/shell.py b/saharaclient/api/shell.py
index 7bdde070..c296a314 100644
--- a/saharaclient/api/shell.py
+++ b/saharaclient/api/shell.py
@@ -26,6 +26,31 @@ def _print_list_field(field):
     return lambda obj: ', '.join(getattr(obj, field))
 
 
+def _filter_call_args(args, func, remap={}):
+    """Filter args according to func's parameter list.
+
+    Take three arguments:
+     * args - a dictionary
+     * func - a function
+     * remap - a dictionary
+    Remove from dct all the keys which are not among the parameters
+    of func. Before filtering, remap the keys in the args dict
+    according to remap dict.
+    """
+
+    for name, new_name in remap.items():
+        if name in args:
+            args[new_name] = args[name]
+            del args[name]
+
+    valid_args = inspect.getargspec(func).args
+    for name in args.keys():
+        if name not in valid_args:
+            print('WARNING: "%s" is not a valid parameter and will be '
+                  'discarded from the request' % name)
+            del args[name]
+
+
 def _print_node_group_field(cluster):
     return ', '.join(map(lambda x: ': '.join(x),
                          [(node_group['name'],
@@ -295,12 +320,9 @@ def do_cluster_create(cs, args):
     # called net_id. Therefore, we must translate before invoking
     # create w/ **template. It may be desirable to simple change
     # clusters.create in the future.
-    template['net_id'] = template.get('neutron_management_network', None)
-    valid_args = inspect.getargspec(cs.clusters.create).args
-    for name in template.keys():
-        if name not in valid_args:
-            # TODO(mattf): make this verbose - bug/1271147
-            del template[name]
+    remap = {'neutron_management_network': 'net_id'}
+    _filter_call_args(template, cs.clusters.create, remap)
+
     _show_cluster(cs.clusters.create(**template))
 
 
@@ -363,11 +385,8 @@ def do_node_group_template_create(cs, args):
     """Create a node group template."""
      # TODO(mattf): improve template validation, e.g. template w/o name key
     template = json.loads(args.json.read())
-    valid_args = inspect.getargspec(cs.node_group_templates.create).args
-    for name in template.keys():
-        if name not in valid_args:
-            # TODO(mattf): make this verbose - bug/1271147
-            del template[name]
+    _filter_call_args(template, cs.node_group_templates.create)
+
     _show_node_group_template(cs.node_group_templates.create(**template))
 
 
@@ -431,11 +450,9 @@ def do_cluster_template_create(cs, args):
     """Create a cluster template."""
      # TODO(mattf): improve template validation, e.g. template w/o name key
     template = json.loads(args.json.read())
-    valid_args = inspect.getargspec(cs.cluster_templates.create).args
-    for name in template.keys():
-        if name not in valid_args:
-            # TODO(mattf): make this verbose - bug/1271147
-            del template[name]
+    remap = {'neutron_management_network': 'net_id'}
+    _filter_call_args(template, cs.cluster_templates.create, remap)
+
     _show_cluster_template(cs.cluster_templates.create(**template))