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diff --git a/src/plugins/mdata/mdata.api b/src/plugins/mdata/mdata.api
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+/*
+ * mdata.api - binary API skeleton
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file mdata.api
+ * @brief VPP control-plane API messages.
+ *
+ * This file defines VPP control-plane binary API messages which are generally
+ * called through a shared memory interface.
+ */
+
+/* Version and type recitations */
+
+option version = "0.1.0";
+import "vnet/interface_types.api";
+
+/** @brief API to enable / disable mdata on an interface
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param enable_disable - 1 to enable, 0 to disable the feature
+*/
+
+autoreply define mdata_enable_disable {
+  /* Client identifier, set from api_main.my_client_index */
+  u32 client_index;
+
+  /* Arbitrary context, so client can match reply to request */
+  u32 context;
+
+  /* Enable / disable the feature */
+  bool enable_disable;
+};