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diff --git a/src/lib/dhcp/docsis3_option_defs.h b/src/lib/dhcp/docsis3_option_defs.h
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+++ b/src/lib/dhcp/docsis3_option_defs.h
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+// Copyright (C) 2013-2021 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 DOCSIS3_OPTION_DEFS_H
+#define DOCSIS3_OPTION_DEFS_H
+
+#include <dhcp/std_option_defs.h>
+#include <dhcp/option_data_types.h>
+
+/// @brief global docsis3 option spaces
+#define DOCSIS3_V4_OPTION_SPACE          "docsis3-v4"
+#define DOCSIS3_V6_OPTION_SPACE          "docsis3-v6"
+
+namespace isc {
+namespace dhcp {
+
+#define VENDOR_ID_CABLE_LABS 4491
+
+#define DOCSIS3_V4_ORO 1
+#define DOCSIS3_V4_TFTP_SERVERS 2
+
+/// @brief Definitions of standard DHCPv4 options.
+const OptionDefParams DOCSIS3_V4_OPTION_DEFINITIONS[] = {
+    { "oro", DOCSIS3_V4_ORO,
+      DOCSIS3_V4_OPTION_SPACE, OPT_UINT8_TYPE, true, NO_RECORD_DEF, "" },
+    { "tftp-servers", DOCSIS3_V4_TFTP_SERVERS,
+      DOCSIS3_V4_OPTION_SPACE, OPT_IPV4_ADDRESS_TYPE, true, NO_RECORD_DEF, "" }
+};
+
+/// Number of option definitions defined.
+const int DOCSIS3_V4_OPTION_DEFINITIONS_SIZE =
+    sizeof(DOCSIS3_V4_OPTION_DEFINITIONS) /
+    sizeof(DOCSIS3_V4_OPTION_DEFINITIONS[0]);
+
+/// @todo define remaining docsis3 v6 codes
+#define DOCSIS3_V6_ORO 1
+#define DOCSIS3_V6_DEVICE_TYPE 2
+#define DOCSIS3_V6_VENDOR_NAME 10
+#define DOCSIS3_V6_TFTP_SERVERS 32
+#define DOCSIS3_V6_CONFIG_FILE 33
+#define DOCSIS3_V6_SYSLOG_SERVERS 34
+#define DOCSIS3_V6_DEVICE_ID 36
+#define DOCSIS3_V6_TIME_SERVERS 37
+#define DOCSIS3_V6_TIME_OFFSET 38
+
+// The following DOCSIS3 options are inserted by the CMTS (which acts as
+// a relay agent)
+#define DOCSIS3_V6_CMTS_CM_MAC 1026
+
+/// @brief Definitions of standard DHCPv6 options.
+const OptionDefParams DOCSIS3_V6_OPTION_DEFINITIONS[] = {
+    { "oro",            DOCSIS3_V6_ORO,
+      DOCSIS3_V6_OPTION_SPACE, OPT_UINT16_TYPE, true, NO_RECORD_DEF, "" },
+    { "device-type",    DOCSIS3_V6_DEVICE_TYPE,
+      DOCSIS3_V6_OPTION_SPACE, OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
+    { "vendor-type",    DOCSIS3_V6_VENDOR_NAME,
+      DOCSIS3_V6_OPTION_SPACE, OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
+    { "tftp-servers",   DOCSIS3_V6_TFTP_SERVERS,
+      DOCSIS3_V6_OPTION_SPACE, OPT_IPV6_ADDRESS_TYPE, true, NO_RECORD_DEF, "" },
+    { "time-servers",   DOCSIS3_V6_TIME_SERVERS,
+      DOCSIS3_V6_OPTION_SPACE, OPT_IPV6_ADDRESS_TYPE, true, NO_RECORD_DEF, "" },
+    { "config-file",    DOCSIS3_V6_CONFIG_FILE,
+      DOCSIS3_V6_OPTION_SPACE, OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
+    { "syslog-servers", DOCSIS3_V6_SYSLOG_SERVERS,
+      DOCSIS3_V6_OPTION_SPACE, OPT_IPV6_ADDRESS_TYPE, true, NO_RECORD_DEF, "" },
+    { "device-id",      DOCSIS3_V6_DEVICE_ID,
+      DOCSIS3_V6_OPTION_SPACE, OPT_BINARY_TYPE, false, NO_RECORD_DEF, "" },
+    { "time-offset",    DOCSIS3_V6_TIME_OFFSET,
+      DOCSIS3_V6_OPTION_SPACE, OPT_INT32_TYPE, false, NO_RECORD_DEF, "" },
+    { "cmts-cm-mac",    DOCSIS3_V6_CMTS_CM_MAC,
+      DOCSIS3_V6_OPTION_SPACE, OPT_BINARY_TYPE, false, NO_RECORD_DEF, "" }
+    // @todo add definitions for all remaining options.
+};
+
+/// Number of option definitions defined.
+const int DOCSIS3_V6_OPTION_DEFINITIONS_SIZE =
+    sizeof(DOCSIS3_V6_OPTION_DEFINITIONS) /
+    sizeof(DOCSIS3_V6_OPTION_DEFINITIONS[0]);
+
+/// The class as specified in vendor-class option by the devices
+extern const char* DOCSIS3_CLASS_EROUTER;
+extern const char* DOCSIS3_CLASS_MODEM;
+
+}  // namespace dhcp
+}  // namespace isc
+
+#endif // DOCSIS3_OPTION_DEFS_H