diff --git a/confluent_server/confluent/core.py b/confluent_server/confluent/core.py
index 7398464e..2244f0a4 100644
--- a/confluent_server/confluent/core.py
+++ b/confluent_server/confluent/core.py
@@ -398,6 +398,7 @@ def _init_core():
 
     nodegroupresources = {
         'attributes': {
+            'check': PluginRoute({'handler': 'attributes'}),
             'rename': PluginRoute({'handler': 'attributes'}),
             'all': PluginRoute({'handler': 'attributes'}),
             'current': PluginRoute({'handler': 'attributes'}),
diff --git a/confluent_server/confluent/plugins/configuration/attributes.py b/confluent_server/confluent/plugins/configuration/attributes.py
index c1eb94bc..04da045f 100644
--- a/confluent_server/confluent/plugins/configuration/attributes.py
+++ b/confluent_server/confluent/plugins/configuration/attributes.py
@@ -164,6 +164,20 @@ def update(nodes, element, configmanager, inputdata):
 
 
 def update_nodegroup(group, element, configmanager, inputdata):
+    if element == 'check':
+        check = inputdata.attribs
+        decrypt = configmanager.decrypt
+        configmanager.decrypt = True
+        currinfo = configmanager.get_nodegroup_attributes(group, list(check))
+        configmanager.decrypt = decrypt
+        for inf in check:
+            checkvalue = check[inf]
+            if isinstance(checkvalue, dict):
+                checkvalue = checkvalue.get('value', None)
+            currvalue = currinfo.get(inf, {}).get('value')
+            if checkvalue == currvalue:
+                raise exc.InvalidArgumentException('Checked value matches existing value')
+        return retrieve_nodegroup(group, element, configmanager, inputdata)
     if 'rename' in element:
         namemap = {}
         namemap[group] = inputdata.attribs['rename']
@@ -221,6 +235,18 @@ def update_nodes(nodes, element, configmanager, inputdata):
         raise exc.InvalidArgumentException(
             'No action to take, noderange is empty (if trying to define '
             'group attributes, use nodegroupattrib)')
+    if element[-1] == 'check':
+        for node in nodes:
+            check = inputdata.get_attributes(node, allattributes.node)
+            currinfo = configmanager.get_node_attributes(node, list(check), decrypt=True)
+            for inf in check:
+                checkvalue = check[inf]
+                if isinstance(checkvalue, dict):
+                    checkvalue = checkvalue.get('value', None)
+                currvalue = currinfo.get(node, {}).get(inf, {}).get('value')
+                if checkvalue == currvalue:
+                    raise exc.InvalidArgumentException('Checked value matches existing value')
+        return retrieve(nodes, element, configmanager, inputdata)
     if 'rename' in element:
         namemap = {}
         for node in nodes: