diff --git a/inc/sainat.h b/inc/sainat.h
index b2ad864d7..c2a5b37aa 100644
--- a/inc/sainat.h
+++ b/inc/sainat.h
@@ -209,6 +209,17 @@ typedef enum _sai_nat_entry_attr_t
      */
     SAI_NAT_ENTRY_ATTR_HIT_BIT,
 
+    /**
+     * @brief NAT entry aging time in seconds
+     *
+     * Zero means aging is disabled.
+     *
+     * @type sai_uint32_t
+     * @flags CREATE_AND_SET
+     * @default 0
+     */
+    SAI_NAT_ENTRY_ATTR_AGING_TIME,
+
     /**
      * @brief End of NAT Entry attributes
      */
@@ -334,6 +345,34 @@ typedef struct _sai_nat_entry_t
 
 } sai_nat_entry_t;
 
+/**
+ * @brief NAT event type
+ */
+typedef enum _sai_nat_event_t
+{
+    /** NAT entry event none */
+    SAI_NAT_EVENT_NONE,
+
+    /** NAT entry event aged */
+    SAI_NAT_EVENT_AGED,
+
+} sai_nat_event_t;
+
+/**
+ * @brief Notification data format received from SAI NAT callback
+ *
+ * @count attr[attr_count]
+ */
+typedef struct _sai_nat_event_notification_data_t
+{
+    /** Event type */
+    sai_nat_event_t event_type;
+
+    /** NAT entry */
+    sai_nat_entry_t nat_entry;
+
+} sai_nat_event_notification_data_t;
+
 /**
  * @brief Create and return a NAT object
  *
@@ -384,6 +423,18 @@ typedef sai_status_t (*sai_get_nat_entry_attribute_fn)(
         _In_ uint32_t attr_count,
         _Inout_ sai_attribute_t *attr_list);
 
+/**
+ * @brief NAT notifications
+ *
+ * @count data[count]
+ *
+ * @param[in] count Number of notifications
+ * @param[in] data Pointer to NAT event notification data array
+ */
+typedef void (*sai_nat_event_notification_fn)(
+        _In_ uint32_t count,
+        _In_ const sai_nat_event_notification_data_t *data);
+
 /**
  * @brief Bulk create NAT entry
  *
diff --git a/inc/saiswitch.h b/inc/saiswitch.h
index 553ee7480..037cc9b1e 100644
--- a/inc/saiswitch.h
+++ b/inc/saiswitch.h
@@ -2695,6 +2695,17 @@ typedef enum _sai_switch_attr_t
      */
     SAI_SWITCH_ATTR_IPSEC_SA_STATUS_CHANGE_NOTIFY,
 
+    /**
+     * @brief NAT event notification callback function passed to the adapter.
+     *
+     * Use sai_nat_event_notification_fn as notification function.
+     *
+     * @type sai_pointer_t sai_nat_event_notification_fn
+     * @flags CREATE_AND_SET
+     * @default NULL
+     */
+    SAI_SWITCH_ATTR_NAT_EVENT_NOTIFY,
+
     /**
      * @brief End of attributes
      */
diff --git a/meta/parse.pl b/meta/parse.pl
index f2ff0f396..e5c5f5c39 100755
--- a/meta/parse.pl
+++ b/meta/parse.pl
@@ -2520,6 +2520,7 @@ sub ProcessStructValueType
     return "SAI_ATTR_VALUE_TYPE_INT32"          if defined $SAI_ENUMS{$type}; # enum
 
     return "-1"                                 if $type eq "sai_fdb_entry_t";
+    return "-1"                                 if $type eq "sai_nat_entry_t";
     return "-1"                                 if $type eq "sai_attribute_t*";
 
     LogError "invalid struct member value type $type";