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diff --git a/src/lib/dhcpsrv/cfg_consistency.h b/src/lib/dhcpsrv/cfg_consistency.h
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+++ b/src/lib/dhcpsrv/cfg_consistency.h
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+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CFG_CONSISTENCY_H
+#define CFG_CONSISTENCY_H
+
+#include <cc/cfg_to_element.h>
+#include <cc/user_context.h>
+
+namespace isc {
+namespace dhcp {
+
+
+/// @brief Parameters for various consistency checks.
+///
+class CfgConsistency : public isc::data::UserContext, public isc::data::CfgToElement {
+
+    public:
+
+    /// @brief Values for subnet-id sanity checks done for leases.
+    enum LeaseSanity {
+        LEASE_CHECK_NONE, // Skip sanity checks
+        LEASE_CHECK_WARN, // Print a warning if subnet-id is incorrect.
+        LEASE_CHECK_FIX, // If subnet-id is incorrect, try to fix it (try to pick
+                              // appropriate subnet, but if it fails, keep the lease,
+                              // despite its broken subnet-id.
+        LEASE_CHECK_FIX_DEL,  // If subnet-id is incorrect, try to fix it (try to pick
+                              // appropriate subnet.  If it fails, delete broken lease.
+        LEASE_CHECK_DEL       // Delete leases with invalid subnet-id.
+    };
+
+    /// @brief Constructor
+    CfgConsistency()
+        : lease_sanity_check_(LEASE_CHECK_NONE) {
+
+    }
+
+    /// @brief Returns JSON representation
+    ///
+    /// @return Element pointer
+    virtual isc::data::ElementPtr toElement() const;
+
+    /// @brief Sets specific sanity checks mode for leases.
+    ///
+    /// @param l sanity checks mode
+    void setLeaseSanityCheck(LeaseSanity l) {
+        lease_sanity_check_ = l;
+    }
+
+    /// @brief Returns specific sanity checks mode for leases.
+    ///
+    /// @return sanity checks mode
+    LeaseSanity getLeaseSanityCheck() const {
+        return (lease_sanity_check_);
+    }
+
+    /// @brief Converts sanity check value to printable text
+    ///
+    /// @param check_type sanity mode to be converted
+    static std::string sanityCheckToText(LeaseSanity check_type);
+
+ private:
+
+    /// @brief sanity checks mode
+    LeaseSanity lease_sanity_check_;
+};
+
+/// @brief Type used to for pointing to CfgConsistency structure
+typedef boost::shared_ptr<CfgConsistency> CfgConsistencyPtr;
+
+}; // namespace isc::dhcp
+}; // namespace isc
+
+#endif /* CFG_CONSISTENCY_H */