diff --git a/neutron/plugins/ml2/drivers/mech_agent.py b/neutron/plugins/ml2/drivers/mech_agent.py
index 33bc99222f7..024d5f67794 100644
--- a/neutron/plugins/ml2/drivers/mech_agent.py
+++ b/neutron/plugins/ml2/drivers/mech_agent.py
@@ -64,7 +64,14 @@ class AgentMechanismDriverBase(api.MechanismDriver):
             LOG.debug("Refusing to bind due to unsupported vnic_type: %s",
                       vnic_type)
             return
-        for agent in context.host_agents(self.agent_type):
+        agents = context.host_agents(self.agent_type)
+        if not agents:
+            LOG.warning(_LW("Port %(pid)s on network %(network)s not bound, "
+                            "no agent registered on host %(host)s"),
+                        {'pid': context.current['id'],
+                         'network': context.network.current['id'],
+                         'host': context.host})
+        for agent in agents:
             LOG.debug("Checking agent: %s", agent)
             if agent['alive']:
                 for segment in context.segments_to_bind:
diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
index 13b5ced2621..cbcebe6d97d 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
@@ -1486,7 +1486,9 @@ class OVSNeutronAgent(sg_rpc.SecurityGroupAgentRpcCallbackMixin,
                                           details['network_id'])
                 self.ext_manager.handle_port(self.context, details)
             else:
-                LOG.warn(_LW("Device %s not defined on plugin"), device)
+                LOG.warning(
+                    _LW("Device %s not defined on plugin or binding failed"),
+                    device)
                 if (port and port.ofport != -1):
                     self.port_dead(port)
         return (skipped_devices, need_binding_devices,
diff --git a/neutron/plugins/ml2/managers.py b/neutron/plugins/ml2/managers.py
index 97c63434a69..e784ed9f05c 100644
--- a/neutron/plugins/ml2/managers.py
+++ b/neutron/plugins/ml2/managers.py
@@ -687,9 +687,13 @@ class MechanismManager(stevedore.named.NamedExtensionManager):
         if not self._bind_port_level(context, 0,
                                      context.network.network_segments):
             binding.vif_type = portbindings.VIF_TYPE_BINDING_FAILED
-            LOG.error(_LE("Failed to bind port %(port)s on host %(host)s"),
+            LOG.error(_LE("Failed to bind port %(port)s on host %(host)s "
+                          "for vnic_type %(vnic_type)s using segments "
+                          "%(segments)s"),
                       {'port': context.current['id'],
-                       'host': context.host})
+                       'host': context.host,
+                       'vnic_type': binding.vnic_type,
+                       'segments': context.network.network_segments})
 
     def _bind_port_level(self, context, level, segments_to_bind):
         binding = context._binding
@@ -730,6 +734,11 @@ class MechanismManager(stevedore.named.NamedExtensionManager):
                                                  next_segments):
                             return True
                         else:
+                            LOG.warning(_LW("Failed to bind port %(port)s on "
+                                            "host %(host)s at level %(lvl)s"),
+                                        {'port': context.current['id'],
+                                         'host': context.host,
+                                         'lvl': level + 1})
                             context._pop_binding_level()
                     else:
                         # Binding complete.
@@ -748,9 +757,6 @@ class MechanismManager(stevedore.named.NamedExtensionManager):
                 LOG.exception(_LE("Mechanism driver %s failed in "
                                   "bind_port"),
                               driver.name)
-        LOG.error(_LE("Failed to bind port %(port)s on host %(host)s"),
-                  {'port': context.current['id'],
-                   'host': binding.host})
 
     def _check_driver_to_bind(self, driver, segments_to_bind, binding_levels):
         # To prevent a possible binding loop, don't try to bind with
diff --git a/neutron/plugins/ml2/plugin.py b/neutron/plugins/ml2/plugin.py
index 76b2d94056e..8e514135ca4 100644
--- a/neutron/plugins/ml2/plugin.py
+++ b/neutron/plugins/ml2/plugin.py
@@ -1458,8 +1458,8 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                            filter(models_v2.Port.id.startswith(port_id)).
                            one())
             except sa_exc.NoResultFound:
-                LOG.debug("No ports have port_id starting with %s",
-                          port_id)
+                LOG.info(_LI("No ports have port_id starting with %s"),
+                         port_id)
                 return
             except sa_exc.MultipleResultsFound:
                 LOG.error(_LE("Multiple ports have port_id starting with %s"),