diff --git a/neutron/common/config.py b/neutron/common/config.py
index 52ced13f73..3796488d76 100644
--- a/neutron/common/config.py
+++ b/neutron/common/config.py
@@ -25,7 +25,6 @@ from oslo.config import cfg
 from paste import deploy
 
 from neutron.api.v2 import attributes
-from neutron.common import legacy
 from neutron.common import utils
 from neutron.openstack.common.db.sqlalchemy import session as db_session
 from neutron.openstack.common import log as logging
@@ -108,8 +107,6 @@ def parse(args):
     cfg.CONF(args=args, project='neutron',
              version='%%prog %s' % neutron_version.release_string())
 
-    legacy.modernize_quantum_config(cfg.CONF)
-
     # Validate that the base_mac is of the correct format
     msg = attributes._validate_regex(cfg.CONF.base_mac,
                                      attributes.MAC_PATTERN)
diff --git a/neutron/db/migration/cli.py b/neutron/db/migration/cli.py
index 7219038ae0..759c586e13 100644
--- a/neutron/db/migration/cli.py
+++ b/neutron/db/migration/cli.py
@@ -135,5 +135,6 @@ def main():
     config.neutron_config = CONF
 
     CONF()
+    #TODO(gongysh) enable logging
     legacy.modernize_quantum_config(CONF)
     CONF.command.func(config, CONF.command.name)
diff --git a/neutron/service.py b/neutron/service.py
index cb466fc886..b90510ce51 100644
--- a/neutron/service.py
+++ b/neutron/service.py
@@ -23,6 +23,7 @@ import random
 from oslo.config import cfg
 
 from neutron.common import config
+from neutron.common import legacy
 from neutron import context
 from neutron.openstack.common import importutils
 from neutron.openstack.common import log as logging
@@ -80,6 +81,7 @@ class NeutronApiService(WsgiService):
         # Log the options used when starting if we're in debug mode...
 
         config.setup_logging(cfg.CONF)
+        legacy.modernize_quantum_config(cfg.CONF)
         # Dump the initial option values
         cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)
         service = cls(app_name)
diff --git a/neutron/services/loadbalancer/drivers/haproxy/agent.py b/neutron/services/loadbalancer/drivers/haproxy/agent.py
index 9ea62b50e2..0aa183a999 100644
--- a/neutron/services/loadbalancer/drivers/haproxy/agent.py
+++ b/neutron/services/loadbalancer/drivers/haproxy/agent.py
@@ -58,8 +58,8 @@ def main():
     config.register_root_helper(cfg.CONF)
 
     cfg.CONF(project='neutron')
-    legacy.modernize_quantum_config(cfg.CONF)
     config.setup_logging(cfg.CONF)
+    legacy.modernize_quantum_config(cfg.CONF)
 
     mgr = manager.LbaasAgentManager(cfg.CONF)
     svc = LbaasAgentService(