diff --git a/ryu/app/rest_qos.py b/ryu/app/rest_qos.py
index 1753e418..051c96b3 100644
--- a/ryu/app/rest_qos.py
+++ b/ryu/app/rest_qos.py
@@ -193,7 +193,6 @@ REST_SWITCHID = 'switch_id'
 REST_COMMAND_RESULT = 'command_result'
 REST_PRIORITY = 'priority'
 REST_VLANID = 'vlan_id'
-REST_DL_VLAN = 'dl_vlan'
 REST_PORT_NAME = 'port_name'
 REST_QUEUE_TYPE = 'type'
 REST_QUEUE_MAX_RATE = 'max_rate'
diff --git a/ryu/lib/netconf/constants.py b/ryu/lib/netconf/constants.py
index 9ee57a8c..0e68edc0 100644
--- a/ryu/lib/netconf/constants.py
+++ b/ryu/lib/netconf/constants.py
@@ -52,8 +52,8 @@ ERROR = 'error'
 WARNING = 'warning'
 
 # error-info
-# bad-element and ok-element are defined above
-BAD_ATTRIBUTE = 'bad-attribute'
+# bad-attribute, bad-element and ok-element are defined above
+# BAD_ATTRIBUTE = 'bad-attribute'
 # BAD_ELEMENT = 'bad-element'
 # OK_ELEMENT = 'ok-element'
 ERR_ELEMENT = 'err-element'
diff --git a/ryu/ofproto/nx_match.py b/ryu/ofproto/nx_match.py
index c2af35be..f043ce8e 100644
--- a/ryu/ofproto/nx_match.py
+++ b/ryu/ofproto/nx_match.py
@@ -259,10 +259,6 @@ class ClsRule(object):
         self.wc.wildcards &= ~FWW_IPV6_LABEL
         self.flow.ipv6_label = label
 
-    def set_ipv6_label(self, label):
-        self.wc.wildcards &= ~FWW_IPV6_LABEL
-        self.flow.ipv6_label = label
-
     def set_ipv6_src_masked(self, src, mask):
         self.wc.ipv6_src_mask = mask
         self.flow.ipv6_src = [x & y for (x, y) in zip(src, mask)]
diff --git a/ryu/ofproto/ofproto_v1_0.py b/ryu/ofproto/ofproto_v1_0.py
index 2b0e052b..c4499ef5 100644
--- a/ryu/ofproto/ofproto_v1_0.py
+++ b/ryu/ofproto/ofproto_v1_0.py
@@ -197,9 +197,6 @@ OFP_ACTION_OUTPUT_PACK_STR = '!HHHH'
 OFP_ACTION_OUTPUT_SIZE = 8
 assert calcsize(OFP_ACTION_OUTPUT_PACK_STR) == OFP_ACTION_OUTPUT_SIZE
 
-# define constants
-OFP_VLAN_NONE = 0xffff
-
 OFP_ACTION_VLAN_VID_PACK_STR = '!HHH2x'
 OFP_ACTION_VLAN_VID_SIZE = 8
 assert calcsize(OFP_ACTION_VLAN_VID_PACK_STR) == OFP_ACTION_VLAN_VID_SIZE
diff --git a/ryu/ofproto/ofproto_v1_3_parser.py b/ryu/ofproto/ofproto_v1_3_parser.py
index 3d288ffc..62b56a70 100644
--- a/ryu/ofproto/ofproto_v1_3_parser.py
+++ b/ryu/ofproto/ofproto_v1_3_parser.py
@@ -3205,12 +3205,6 @@ class OFPActionPopPbb(OFPAction):
             ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
         return cls()
 
-    @classmethod
-    def parser(cls, buf, offset):
-        (type_, len_) = struct.unpack_from(
-            ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
-        return cls()
-
 
 @OFPAction.register_action_type(
     ofproto.OFPAT_EXPERIMENTER,
diff --git a/ryu/ofproto/ofproto_v1_4_parser.py b/ryu/ofproto/ofproto_v1_4_parser.py
index 1a6e0e79..b359f025 100644
--- a/ryu/ofproto/ofproto_v1_4_parser.py
+++ b/ryu/ofproto/ofproto_v1_4_parser.py
@@ -4114,18 +4114,6 @@ class OFPTableStats(ofproto_parser.namedtuple('OFPTableStats', (
         return stats
 
 
-class OFPTableStats(ofproto_parser.namedtuple('OFPTableStats', (
-        'table_id', 'active_count', 'lookup_count',
-        'matched_count'))):
-    @classmethod
-    def parser(cls, buf, offset):
-        tbl = struct.unpack_from(ofproto.OFP_TABLE_STATS_PACK_STR,
-                                 buf, offset)
-        stats = cls(*tbl)
-        stats.length = ofproto.OFP_TABLE_STATS_SIZE
-        return stats
-
-
 @_set_stats_type(ofproto.OFPMP_TABLE, OFPTableStats)
 @_set_msg_type(ofproto.OFPT_MULTIPART_REQUEST)
 class OFPTableStatsRequest(OFPMultipartRequest):
@@ -5444,12 +5432,6 @@ class OFPActionPopPbb(OFPAction):
             ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
         return cls()
 
-    @classmethod
-    def parser(cls, buf, offset):
-        (type_, len_) = struct.unpack_from(
-            ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
-        return cls()
-
 
 @OFPAction.register_action_type(
     ofproto.OFPAT_EXPERIMENTER,
diff --git a/ryu/ofproto/ofproto_v1_5_parser.py b/ryu/ofproto/ofproto_v1_5_parser.py
index bf4a78de..308e5734 100644
--- a/ryu/ofproto/ofproto_v1_5_parser.py
+++ b/ryu/ofproto/ofproto_v1_5_parser.py
@@ -4255,18 +4255,6 @@ class OFPTableStats(ofproto_parser.namedtuple('OFPTableStats', (
         return stats
 
 
-class OFPTableStats(ofproto_parser.namedtuple('OFPTableStats', (
-        'table_id', 'active_count', 'lookup_count',
-        'matched_count'))):
-    @classmethod
-    def parser(cls, buf, offset):
-        tbl = struct.unpack_from(ofproto.OFP_TABLE_STATS_PACK_STR,
-                                 buf, offset)
-        stats = cls(*tbl)
-        stats.length = ofproto.OFP_TABLE_STATS_SIZE
-        return stats
-
-
 @_set_stats_type(ofproto.OFPMP_TABLE_STATS, OFPTableStats)
 @_set_msg_type(ofproto.OFPT_MULTIPART_REQUEST)
 class OFPTableStatsRequest(OFPMultipartRequest):
@@ -5554,12 +5542,6 @@ class OFPActionPopPbb(OFPAction):
             ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
         return cls()
 
-    @classmethod
-    def parser(cls, buf, offset):
-        (type_, len_) = struct.unpack_from(
-            ofproto.OFP_ACTION_HEADER_PACK_STR, buf, offset)
-        return cls()
-
 
 @OFPAction.register_action_type(ofproto.OFPAT_METER,
                                 ofproto.OFP_ACTION_METER_SIZE)
diff --git a/ryu/tests/integrated/test_add_flow_v10.py b/ryu/tests/integrated/test_add_flow_v10.py
index 6aec1560..6a09646c 100644
--- a/ryu/tests/integrated/test_add_flow_v10.py
+++ b/ryu/tests/integrated/test_add_flow_v10.py
@@ -115,14 +115,6 @@ class RunTest(tester.TestFlowBase):
         action = dp.ofproto_parser.OFPActionOutput(out_port)
         self.add_action(dp, [action, ])
 
-    def test_rule_set_in_port(self, dp):
-        in_port = 32
-        self._verify = ['in_port', in_port]
-
-        rule = nx_match.ClsRule()
-        rule.set_in_port(in_port)
-        self.add_rule(dp, rule)
-
     def test_action_vlan_vid(self, dp):
         vlan_vid = 2
         self._verify = [dp.ofproto.OFPAT_SET_VLAN_VID,