diff --git a/ryu/app/quantum_adapter.py b/ryu/app/quantum_adapter.py
index f6b267d0..bd1914fc 100644
--- a/ryu/app/quantum_adapter.py
+++ b/ryu/app/quantum_adapter.py
@@ -15,7 +15,6 @@
 # limitations under the License.
 
 import traceback
-from oslo.config import cfg
 
 try:
     from neutronclient import client as q_client
@@ -45,10 +44,7 @@ from ryu.lib.ovs import bridge
 from ryu.lib.quantum_ifaces import QuantumIfaces
 
 
-CONF = cfg.CONF
-
-
-def _get_auth_token(logger):
+def _get_auth_token(CONF, logger):
     httpclient = q_client.HTTPClient(
         username=CONF.neutron_admin_username,
         tenant_name=CONF.neutron_admin_tenant_name,
@@ -65,7 +61,7 @@ def _get_auth_token(logger):
     return httpclient.auth_token
 
 
-def _get_quantum_client(token):
+def _get_quantum_client(CONF, token):
     if token:
         my_client = q_clientv2.Client(
             endpoint_url=CONF.neutron_url,
@@ -130,14 +126,15 @@ class OVSPort(object):
 
 
 class OVSSwitch(object):
-    def __init__(self, dpid, nw, ifaces, logger):
+    def __init__(self, CONF, dpid, nw, ifaces, logger):
         # TODO: clean up
+        self.CONF = CONF
         self.dpid = dpid
         self.network_api = nw
         self.ifaces = ifaces
         self.logger = logger
         self._q_api = None      # lazy initialization
-        self.ctrl_addr = CONF.neutron_controller_addr
+        self.ctrl_addr = self.CONF.neutron_controller_addr
         if not self.ctrl_addr:
             raise ValueError('option neutron_controler_addr must be speicfied')
 
@@ -153,9 +150,9 @@ class OVSSwitch(object):
     def q_api(self):
         if self._q_api is None:
             token = None
-            if CONF.neutron_auth_strategy:
-                token = _get_auth_token(self.logger)
-            self._q_api = _get_quantum_client(token)
+            if self.CONF.neutron_auth_strategy:
+                token = _get_auth_token(self.CONF, self.logger)
+            self._q_api = _get_quantum_client(self.CONF, token)
         return self._q_api
 
     def set_ovsdb_addr(self, dpid, ovsdb_addr):
@@ -176,7 +173,7 @@ class OVSSwitch(object):
         self.ovsdb_addr = ovsdb_addr
         if self.ovs_bridge is None:
             self.logger.debug('ovsdb: adding ports %s', self.ports)
-            ovs_bridge = bridge.OVSBridge(dpid, ovsdb_addr)
+            ovs_bridge = bridge.OVSBridge(self.CONF, dpid, ovsdb_addr)
             self.ovs_bridge = ovs_bridge
             ovs_bridge.init()
             # TODO: for multi-controller
@@ -352,7 +349,8 @@ class QuantumAdapter(app_manager.RyuApp):
         ovs_switch = self.dps.get(dpid)
         if not ovs_switch:
             if create:
-                ovs_switch = OVSSwitch(dpid, self.nw, self.ifaces, self.logger)
+                ovs_switch = OVSSwitch(self.CONF, dpid, self.nw, self.ifaces,
+                                       self.logger)
                 self.dps[dpid] = ovs_switch
         else:
             self.logger.debug('ovs switch %s is already known', dpid)
diff --git a/ryu/app/simple_vlan.py b/ryu/app/simple_vlan.py
index a64d4eb6..f18151ac 100644
--- a/ryu/app/simple_vlan.py
+++ b/ryu/app/simple_vlan.py
@@ -124,7 +124,7 @@ class SimpleVLAN(app_manager.RyuApp):
         self.logger.debug('ovs_port_update dpid %s port_no %s', dpid, port_no)
         # ovs-vsctl --db=ovsdb_addr --timeout=2
         # set Port port.name tag=tunnel_key
-        ovs_br = bridge.OVSBridge(dpid, ovsdb_addr, 2)
+        ovs_br = bridge.OVSBridge(self.CONF, dpid, ovsdb_addr, 2)
         # ofp_phy_port::name is zero-padded
         port_name = port.name.rstrip('\x00')
         try:
diff --git a/ryu/app/tunnel_port_updater.py b/ryu/app/tunnel_port_updater.py
index c8283484..3c1f5c8c 100644
--- a/ryu/app/tunnel_port_updater.py
+++ b/ryu/app/tunnel_port_updater.py
@@ -17,7 +17,7 @@
 # This module updates OVS tunnel ports for OpenStack integration.
 
 import collections
-from oslo.config import cfg
+from ryu import cfg
 import logging
 import netaddr
 
@@ -34,12 +34,6 @@ from ryu.lib import hub
 from ryu.lib.ovs import bridge as ovs_bridge
 
 
-CONF = cfg.CONF
-CONF.register_opts([
-    cfg.StrOpt('tunnel-type', default='gre',
-               help='tunnel type for ovs tunnel port')
-])
-
 _TUNNEL_TYPE_TO_NW_ID = {
     'gre': rest_nw_id.NW_ID_VPORT_GRE,
 }
@@ -104,15 +98,15 @@ class TunnelPort(object):
 
 
 class TunnelDP(object):
-    def __init__(self, dpid, ovsdb_addr, tunnel_ip, tunnel_type, conf_switch_,
-                 network_api, tunnel_api, logger):
+    def __init__(self, CONF, dpid, ovsdb_addr, tunnel_ip, tunnel_type,
+                 conf_switch_, network_api, tunnel_api, logger):
         super(TunnelDP, self).__init__()
         self.dpid = dpid
         self.network_api = network_api
         self.tunnel_api = tunnel_api
         self.logger = logger
 
-        self.ovs_bridge = ovs_bridge.OVSBridge(dpid, ovsdb_addr)
+        self.ovs_bridge = ovs_bridge.OVSBridge(CONF, dpid, ovsdb_addr)
 
         self.tunnel_ip = tunnel_ip
         self.tunnel_type = tunnel_type
@@ -355,7 +349,11 @@ class TunnelPortUpdater(app_manager.RyuApp):
 
     def __init__(self, *args, **kwargs):
         super(TunnelPortUpdater, self).__init__(args, kwargs)
-        self.tunnel_type = CONF.tunnel_type
+        self.CONF.register_opts([
+            cfg.StrOpt('tunnel-type', default='gre',
+                       help='tunnel type for ovs tunnel port')
+        ])
+        self.tunnel_type = self.CONF.tunnel_type
         self.cs = kwargs['conf_switch']
         self.nw = kwargs['network']
         self.tunnels = kwargs['tunnels']
@@ -373,7 +371,7 @@ class TunnelPortUpdater(app_manager.RyuApp):
                           ovs_tunnel_addr)
         if dpid not in self.tunnel_dpset:
             # TODO:XXX changing ovsdb_addr, ovs_tunnel_addr
-            tunnel_dp = TunnelDP(dpid, ovsdb_addr, ovs_tunnel_addr,
+            tunnel_dp = TunnelDP(self.CONF, dpid, ovsdb_addr, ovs_tunnel_addr,
                                  self.tunnel_type, self.cs,
                                  self.network_api, self.tunnel_api,
                                  self.logger)
diff --git a/ryu/app/wsgi.py b/ryu/app/wsgi.py
index 80698c08..384c32c2 100644
--- a/ryu/app/wsgi.py
+++ b/ryu/app/wsgi.py
@@ -16,7 +16,7 @@
 
 import inspect
 
-from oslo.config import cfg
+from ryu import cfg
 import webob.dec
 
 from ryu.lib import hub
diff --git a/ryu/cmd/manager.py b/ryu/cmd/manager.py
index 234b96c5..b1180f7b 100755
--- a/ryu/cmd/manager.py
+++ b/ryu/cmd/manager.py
@@ -28,7 +28,7 @@ hub.patch()
 # eg. oslo.config.cfg.
 import ryu.contrib
 
-from oslo.config import cfg
+from ryu import cfg
 import logging
 import sys
 
diff --git a/ryu/cmd/of_config_cli.py b/ryu/cmd/of_config_cli.py
index 6973b80f..0f4c2cf4 100755
--- a/ryu/cmd/of_config_cli.py
+++ b/ryu/cmd/of_config_cli.py
@@ -25,7 +25,7 @@
 
 import ryu.contrib
 
-from oslo.config import cfg
+from ryu import cfg
 
 import cmd
 import sys
diff --git a/ryu/cmd/ofa_neutron_agent.py b/ryu/cmd/ofa_neutron_agent.py
index 42656b30..80e93534 100755
--- a/ryu/cmd/ofa_neutron_agent.py
+++ b/ryu/cmd/ofa_neutron_agent.py
@@ -29,7 +29,7 @@ hub.patch()
 # eg. oslo.config.cfg.
 import ryu.contrib
 
-from oslo.config import cfg
+from ryu import cfg
 import sys
 
 from neutron.openstack.common import log as os_logging
diff --git a/ryu/cmd/rpc_cli.py b/ryu/cmd/rpc_cli.py
index 05696b32..a297000b 100755
--- a/ryu/cmd/rpc_cli.py
+++ b/ryu/cmd/rpc_cli.py
@@ -31,7 +31,7 @@
 
 import ryu.contrib
 
-from oslo.config import cfg
+from ryu import cfg
 
 import cmd
 import signal
diff --git a/ryu/controller/controller.py b/ryu/controller/controller.py
index 942b12e8..93d2b33b 100644
--- a/ryu/controller/controller.py
+++ b/ryu/controller/controller.py
@@ -15,7 +15,7 @@
 # limitations under the License.
 
 import contextlib
-from oslo.config import cfg
+from ryu import cfg
 import logging
 from ryu.lib import hub
 from ryu.lib.hub import StreamServer
diff --git a/ryu/flags.py b/ryu/flags.py
index 66ac1abe..98cb96cb 100644
--- a/ryu/flags.py
+++ b/ryu/flags.py
@@ -17,7 +17,7 @@
 global flags
 """
 
-from oslo.config import cfg
+from ryu import cfg
 
 CONF = cfg.CONF
 
diff --git a/ryu/lib/ovs/bridge.py b/ryu/lib/ovs/bridge.py
index 4556e045..cc43646f 100644
--- a/ryu/lib/ovs/bridge.py
+++ b/ryu/lib/ovs/bridge.py
@@ -19,7 +19,7 @@ slimmed down version of OVSBridge in quantum agent
 """
 
 import functools
-from oslo.config import cfg
+from ryu import cfg
 import logging
 
 import ryu.exception as ryu_exc
@@ -88,7 +88,8 @@ class TunnelPort(object):
 
 
 class OVSBridge(object):
-    def __init__(self, datapath_id, ovsdb_addr, timeout=None, exception=None):
+    def __init__(self, CONF, datapath_id, ovsdb_addr, timeout=None,
+                 exception=None):
         super(OVSBridge, self).__init__()
         self.datapath_id = datapath_id
         self.vsctl = ovs_vsctl.VSCtl(ovsdb_addr)
diff --git a/ryu/log.py b/ryu/log.py
index b9a3c3af..d4af519a 100644
--- a/ryu/log.py
+++ b/ryu/log.py
@@ -15,7 +15,7 @@
 # limitations under the License.
 
 from __future__ import print_function
-from oslo.config import cfg
+from ryu import cfg
 import inspect
 import platform
 import logging
diff --git a/ryu/services/protocols/vrrp/rpc_manager.py b/ryu/services/protocols/vrrp/rpc_manager.py
index 0ba15e1d..7b92d2be 100644
--- a/ryu/services/protocols/vrrp/rpc_manager.py
+++ b/ryu/services/protocols/vrrp/rpc_manager.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from oslo.config import cfg
+from ryu import cfg
 import socket
 
 import netaddr
@@ -26,11 +26,6 @@ from ryu.lib import hub
 from ryu.lib import mac
 
 VRRP_RPC_PORT = 50004  # random
-CONF = cfg.CONF
-
-CONF.register_opts([
-    cfg.IntOpt('vrrp-rpc-port', default=VRRP_RPC_PORT,
-               help='port for vrrp rpc interface')])
 
 
 class RPCError(Exception):
@@ -49,6 +44,10 @@ class Peer(object):
 class RpcVRRPManager(app_manager.RyuApp):
     def __init__(self, *args, **kwargs):
         super(RpcVRRPManager, self).__init__(*args, **kwargs)
+        self.CONF.register_opts([
+            cfg.IntOpt('vrrp-rpc-port', default=VRRP_RPC_PORT,
+                       help='port for vrrp rpc interface')])
+
         self._args = args
         self._kwargs = kwargs
         self._peers = []
@@ -90,7 +89,7 @@ class RpcVRRPManager(app_manager.RyuApp):
         hub.spawn(self._peer_loop_thread, peer)
 
     def _peer_accept_thread(self):
-        server = hub.StreamServer(('', CONF.vrrp_rpc_port),
+        server = hub.StreamServer(('', self.CONF.vrrp_rpc_port),
                                   self.peer_accept_handler)
         server.serve_forever()
 
diff --git a/ryu/tests/switch/tester.py b/ryu/tests/switch/tester.py
index f1c132f2..59101e18 100644
--- a/ryu/tests/switch/tester.py
+++ b/ryu/tests/switch/tester.py
@@ -21,7 +21,7 @@ import signal
 import sys
 import traceback
 
-from oslo.config import cfg
+from ryu import cfg
 
 # import all packet libraries.
 PKT_LIB_PATH = 'ryu.lib.packet'
diff --git a/ryu/topology/switches.py b/ryu/topology/switches.py
index e53a229d..fb3af8e0 100644
--- a/ryu/topology/switches.py
+++ b/ryu/topology/switches.py
@@ -17,7 +17,7 @@ import logging
 import struct
 import time
 import json
-from oslo.config import cfg
+from ryu import cfg
 
 from ryu.topology import event
 from ryu.base import app_manager
@@ -453,10 +453,10 @@ class Switches(app_manager.RyuApp):
         self.links = LinkState()      # Link class -> timestamp
         self.is_active = True
 
-        self.link_discovery = CONF.observe_links
+        self.link_discovery = self.CONF.observe_links
         if self.link_discovery:
-            self.install_flow = CONF.install_lldp_flow
-            self.explicit_drop = CONF.explicit_drop
+            self.install_flow = self.CONF.install_lldp_flow
+            self.explicit_drop = self.CONF.explicit_drop
             self.lldp_event = hub.Event()
             self.link_event = hub.Event()
             self.threads.append(hub.spawn(self.lldp_loop))