diff --git a/neutron/plugins/ml2/driver_api.py b/neutron/plugins/ml2/driver_api.py
index 8b0484d13..779ebdf92 100644
--- a/neutron/plugins/ml2/driver_api.py
+++ b/neutron/plugins/ml2/driver_api.py
@@ -149,21 +149,23 @@ class NetworkContext(object):
 
     @abc.abstractproperty
     def current(self):
-        """Return the current state of the network.
+        """Return the network in its current configuration.
 
-        Return the current state of the network, as defined by
-        NeutronPluginBaseV2.create_network and all extensions in the
-        ml2 plugin.
+        Return the network, as defined by NeutronPluginBaseV2.
+        create_network and all extensions in the ml2 plugin, with
+        all its properties 'current' at the time the context was
+        established.
         """
         pass
 
     @abc.abstractproperty
     def original(self):
-        """Return the original state of the network.
+        """Return the network in its original configuration.
 
-        Return the original state of the network, prior to a call to
-        update_network. Method is only valid within calls to
-        update_network_precommit and update_network_postcommit.
+        Return the network, with all its properties set to their
+        original values prior to a call to update_network. Method is
+        only valid within calls to update_network_precommit and
+        update_network_postcommit.
         """
         pass
 
@@ -185,21 +187,23 @@ class SubnetContext(object):
 
     @abc.abstractproperty
     def current(self):
-        """Return the current state of the subnet.
+        """Return the subnet in its current configuration.
 
-        Return the current state of the subnet, as defined by
-        NeutronPluginBaseV2.create_subnet and all extensions in the
-        ml2 plugin.
+        Return the subnet, as defined by NeutronPluginBaseV2.
+        create_subnet and all extensions in the ml2 plugin, with
+        all its properties 'current' at the time the context was
+        established.
         """
         pass
 
     @abc.abstractproperty
     def original(self):
-        """Return the original state of the subnet.
+        """Return the subnet in its original configuration.
 
-        Return the original state of the subnet, prior to a call to
-        update_subnet. Method is only valid within calls to
-        update_subnet_precommit and update_subnet_postcommit.
+        Return the subnet, with all its properties set to their
+        original values prior to a call to update_subnet. Method is
+        only valid within calls to update_subnet_precommit and
+        update_subnet_postcommit.
         """
         pass
 
@@ -216,21 +220,37 @@ class PortContext(object):
 
     @abc.abstractproperty
     def current(self):
-        """Return the current state of the port.
+        """Return the port in its current configuration.
 
-        Return the current state of the port, as defined by
-        NeutronPluginBaseV2.create_port and all extensions in the ml2
-        plugin.
+        Return the port, as defined by NeutronPluginBaseV2.
+        create_port and all extensions in the ml2 plugin, with
+        all its properties 'current' at the time the context was
+        established.
         """
         pass
 
     @abc.abstractproperty
     def original(self):
-        """Return the original state of the port.
+        """Return the port in its original configuration.
 
-        Return the original state of the port, prior to a call to
-        update_port. Method is only valid within calls to
-        update_port_precommit and update_port_postcommit.
+        Return the port, with all its properties set to their
+        original values prior to a call to update_port. Method is
+        only valid within calls to update_port_precommit and
+        update_port_postcommit.
+        """
+        pass
+
+    @abc.abstractproperty
+    def status(self):
+        """Return the status of the current port."""
+        pass
+
+    @abc.abstractproperty
+    def original_status(self):
+        """Return the status of the original port.
+
+        The method is only valid within calls to update_port_precommit and
+        update_port_postcommit.
         """
         pass
 
@@ -254,6 +274,20 @@ class PortContext(object):
         """
         pass
 
+    @abc.abstractproperty
+    def host(self):
+        """Return the host associated with the 'current' port."""
+        pass
+
+    @abc.abstractproperty
+    def original_host(self):
+        """Return the host associated with the 'original' port.
+
+        Method is only valid within calls to update_port_precommit
+        and update_port_postcommit.
+        """
+        pass
+
     @abc.abstractproperty
     def bound_driver(self):
         """Return the currently bound mechanism driver name."""
diff --git a/neutron/plugins/ml2/driver_context.py b/neutron/plugins/ml2/driver_context.py
index 08f9b12c9..62b578217 100644
--- a/neutron/plugins/ml2/driver_context.py
+++ b/neutron/plugins/ml2/driver_context.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron.extensions import portbindings
 from neutron.openstack.common import jsonutils
 from neutron.plugins.ml2 import db
 from neutron.plugins.ml2 import driver_api as api
@@ -93,6 +94,14 @@ class PortContext(MechanismDriverContext, api.PortContext):
     def original(self):
         return self._original_port
 
+    @property
+    def status(self):
+        return self._port['status']
+
+    @property
+    def original_status(self):
+        return self._original_port['status']
+
     @property
     def network(self):
         return self._network_context
@@ -112,6 +121,14 @@ class PortContext(MechanismDriverContext, api.PortContext):
                 if segment[api.ID] == self._original_bound_segment_id:
                     return segment
 
+    @property
+    def host(self):
+        return self._port.get(portbindings.HOST_ID)
+
+    @property
+    def original_host(self):
+        return self._original_port.get(portbindings.HOST_ID)
+
     @property
     def bound_driver(self):
         return self._binding.driver
diff --git a/neutron/plugins/ml2/drivers/arista/mechanism_arista.py b/neutron/plugins/ml2/drivers/arista/mechanism_arista.py
index a86d542d9..08a1696b1 100644
--- a/neutron/plugins/ml2/drivers/arista/mechanism_arista.py
+++ b/neutron/plugins/ml2/drivers/arista/mechanism_arista.py
@@ -19,7 +19,6 @@ import jsonrpclib
 from oslo.config import cfg
 
 from neutron.common import constants as n_const
-from neutron.extensions import portbindings
 from neutron.openstack.common import log as logging
 from neutron.plugins.ml2.common import exceptions as ml2_exc
 from neutron.plugins.ml2 import driver_api
@@ -801,7 +800,7 @@ class AristaDriver(driver_api.MechanismDriver):
         port = context.current
         device_id = port['device_id']
         device_owner = port['device_owner']
-        host = port[portbindings.HOST_ID]
+        host = context.host
 
         # device_id and device_owner are set on VM boot
         is_vm_boot = device_id and device_owner
@@ -822,7 +821,7 @@ class AristaDriver(driver_api.MechanismDriver):
         port = context.current
         device_id = port['device_id']
         device_owner = port['device_owner']
-        host = port[portbindings.HOST_ID]
+        host = context.host
 
         # device_id and device_owner are set on VM boot
         is_vm_boot = device_id and device_owner
@@ -885,7 +884,7 @@ class AristaDriver(driver_api.MechanismDriver):
 
         device_id = port['device_id']
         device_owner = port['device_owner']
-        host = port[portbindings.HOST_ID]
+        host = context.host
         is_vm_boot = device_id and device_owner
 
         if host and is_vm_boot:
@@ -926,7 +925,7 @@ class AristaDriver(driver_api.MechanismDriver):
         """Delete information about a VM and host from the DB."""
         port = context.current
 
-        host_id = port[portbindings.HOST_ID]
+        host_id = context.host
         device_id = port['device_id']
         tenant_id = port['tenant_id']
         network_id = port['network_id']
@@ -947,7 +946,7 @@ class AristaDriver(driver_api.MechanismDriver):
         """
         port = context.current
         device_id = port['device_id']
-        host = port[portbindings.HOST_ID]
+        host = context.host
         port_id = port['id']
         network_id = port['network_id']
         tenant_id = port['tenant_id']
diff --git a/neutron/plugins/ml2/drivers/cisco/apic/mechanism_apic.py b/neutron/plugins/ml2/drivers/cisco/apic/mechanism_apic.py
index d5297df68..f526fd746 100644
--- a/neutron/plugins/ml2/drivers/cisco/apic/mechanism_apic.py
+++ b/neutron/plugins/ml2/drivers/cisco/apic/mechanism_apic.py
@@ -93,7 +93,7 @@ class APICMechanismDriver(api.MechanismDriver):
             # Not a compute port, return
             return
 
-        host = port.get(portbindings.HOST_ID)
+        host = context.host
         # Check host that the dhcp agent is running on
         filters = {'device_owner': 'network:dhcp',
                    'network_id': network}
diff --git a/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py b/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py
index 8db752829..e77212ffb 100644
--- a/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py
+++ b/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py
@@ -155,8 +155,7 @@ class CiscoNexusMechanismDriver(api.MechanismDriver):
 
     def _is_vm_migration(self, context):
         if not context.bound_segment and context.original_bound_segment:
-            return (context.current.get(portbindings.HOST_ID) !=
-                    context.original.get(portbindings.HOST_ID))
+            return context.host != context.original_host
 
     def _port_action(self, port, segment, func):
         """Verify configuration and then process event."""
diff --git a/neutron/plugins/ml2/drivers/l2pop/mech_driver.py b/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
index 531dd5ee3..ede0f8df4 100644
--- a/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
+++ b/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
@@ -48,7 +48,8 @@ class L2populationMechanismDriver(api.MechanismDriver,
                  ip['ip_address']] for ip in port['fixed_ips']]
 
     def delete_port_postcommit(self, context):
-        fanout_msg = self._update_port_down(context, context.current)
+        fanout_msg = self._update_port_down(
+            context, context.current, context.host)
         if fanout_msg:
             self.L2populationAgentNotify.remove_fdb_entries(
                 self.rpc_ctx, fanout_msg)
@@ -67,7 +68,8 @@ class L2populationMechanismDriver(api.MechanismDriver,
     def _fixed_ips_changed(self, context, orig, port, diff_ips):
         orig_ips, port_ips = diff_ips
 
-        port_infos = self._get_port_infos(context, orig)
+        port_infos = self._get_port_infos(
+            context, orig, context.original_host)
         if not port_infos:
             return
         agent, agent_ip, segment, port_fdb_entries = port_infos
@@ -96,30 +98,34 @@ class L2populationMechanismDriver(api.MechanismDriver,
         diff_ips = self._get_diff_ips(orig, port)
         if diff_ips:
             self._fixed_ips_changed(context, orig, port, diff_ips)
-        if (port['binding:host_id'] != orig['binding:host_id']
-            and port['status'] == const.PORT_STATUS_ACTIVE
+        if (context.host != context.original_host
+            and context.status == const.PORT_STATUS_ACTIVE
             and not self.migrated_ports.get(orig['id'])):
             # The port has been migrated. We have to store the original
             # binding to send appropriate fdb once the port will be set
             # on the destination host
-            self.migrated_ports[orig['id']] = orig
-        elif port['status'] != orig['status']:
-            if port['status'] == const.PORT_STATUS_ACTIVE:
+            self.migrated_ports[orig['id']] = (
+                (orig, context.original_host))
+        elif context.status != context.original_status:
+            if context.status == const.PORT_STATUS_ACTIVE:
                 self._update_port_up(context)
-            elif port['status'] == const.PORT_STATUS_DOWN:
-                fdb_entries = self._update_port_down(context, port)
+            elif context.status == const.PORT_STATUS_DOWN:
+                fdb_entries = self._update_port_down(
+                    context, port, context.host)
                 self.L2populationAgentNotify.remove_fdb_entries(
                     self.rpc_ctx, fdb_entries)
-            elif port['status'] == const.PORT_STATUS_BUILD:
+            elif context.status == const.PORT_STATUS_BUILD:
                 orig = self.migrated_ports.pop(port['id'], None)
                 if orig:
-                    # this port has been migrated : remove its entries from fdb
-                    fdb_entries = self._update_port_down(context, orig)
+                    original_port = orig[0]
+                    original_host = orig[1]
+                    # this port has been migrated: remove its entries from fdb
+                    fdb_entries = self._update_port_down(
+                        context, original_port, original_host)
                     self.L2populationAgentNotify.remove_fdb_entries(
                         self.rpc_ctx, fdb_entries)
 
-    def _get_port_infos(self, context, port):
-        agent_host = port['binding:host_id']
+    def _get_port_infos(self, context, port, agent_host):
         if not agent_host:
             return
 
@@ -150,14 +156,14 @@ class L2populationMechanismDriver(api.MechanismDriver,
         return agent, agent_ip, segment, fdb_entries
 
     def _update_port_up(self, context):
-        port_context = context.current
-        port_infos = self._get_port_infos(context, port_context)
+        port = context.current
+        agent_host = context.host
+        port_infos = self._get_port_infos(context, port, agent_host)
         if not port_infos:
             return
         agent, agent_ip, segment, port_fdb_entries = port_infos
 
-        agent_host = port_context['binding:host_id']
-        network_id = port_context['network_id']
+        network_id = port['network_id']
 
         session = db_api.get_session()
         agent_active_ports = self.get_agent_network_active_port_count(
@@ -209,14 +215,13 @@ class L2populationMechanismDriver(api.MechanismDriver,
         self.L2populationAgentNotify.add_fdb_entries(self.rpc_ctx,
                                                      other_fdb_entries)
 
-    def _update_port_down(self, context, port_context):
-        port_infos = self._get_port_infos(context, port_context)
+    def _update_port_down(self, context, port, agent_host):
+        port_infos = self._get_port_infos(context, port, agent_host)
         if not port_infos:
             return
         agent, agent_ip, segment, port_fdb_entries = port_infos
 
-        agent_host = port_context['binding:host_id']
-        network_id = port_context['network_id']
+        network_id = port['network_id']
 
         session = db_api.get_session()
         agent_active_ports = self.get_agent_network_active_port_count(
diff --git a/neutron/tests/unit/ml2/_test_mech_agent.py b/neutron/tests/unit/ml2/_test_mech_agent.py
index 4fbdc10e5..79f108e3a 100644
--- a/neutron/tests/unit/ml2/_test_mech_agent.py
+++ b/neutron/tests/unit/ml2/_test_mech_agent.py
@@ -59,6 +59,14 @@ class FakePortContext(api.PortContext):
     def original(self):
         return None
 
+    @property
+    def status(self):
+        return 'DOWN'
+
+    @property
+    def original_status(self):
+        return None
+
     @property
     def network(self):
         return self._network_context
@@ -74,6 +82,14 @@ class FakePortContext(api.PortContext):
     def original_bound_segment(self):
         return None
 
+    @property
+    def host(self):
+        return ''
+
+    @property
+    def original_host(self):
+        return None
+
     @property
     def bound_driver(self):
         return None
diff --git a/neutron/tests/unit/ml2/drivers/arista/test_arista_mechanism_driver.py b/neutron/tests/unit/ml2/drivers/arista/test_arista_mechanism_driver.py
index 42028a8fe..8749d5073 100644
--- a/neutron/tests/unit/ml2/drivers/arista/test_arista_mechanism_driver.py
+++ b/neutron/tests/unit/ml2/drivers/arista/test_arista_mechanism_driver.py
@@ -18,6 +18,7 @@ from oslo.config import cfg
 
 from neutron.common import constants as n_const
 import neutron.db.api as ndb
+from neutron.extensions import portbindings
 from neutron.plugins.ml2.drivers.arista import db
 from neutron.plugins.ml2.drivers.arista import exceptions as arista_exc
 from neutron.plugins.ml2.drivers.arista import mechanism_arista as arista
@@ -723,3 +724,11 @@ class FakePortContext(object):
     @property
     def network(self):
         return self._network_context
+
+    @property
+    def host(self):
+        return self._port.get(portbindings.HOST_ID)
+
+    @property
+    def original_host(self):
+        return self._original_port.get(portbindings.HOST_ID)
diff --git a/neutron/tests/unit/ml2/drivers/cisco/apic/test_cisco_apic_mechanism_driver.py b/neutron/tests/unit/ml2/drivers/cisco/apic/test_cisco_apic_mechanism_driver.py
index 6addd4382..fbd30e67d 100644
--- a/neutron/tests/unit/ml2/drivers/cisco/apic/test_cisco_apic_mechanism_driver.py
+++ b/neutron/tests/unit/ml2/drivers/cisco/apic/test_cisco_apic_mechanism_driver.py
@@ -19,6 +19,7 @@ import mock
 
 from oslo.config import cfg
 
+from neutron.extensions import portbindings
 from neutron.plugins.ml2.drivers.cisco.apic import mechanism_apic as md
 from neutron.plugins.ml2.drivers import type_vlan  # noqa
 from neutron.tests import base
@@ -224,3 +225,11 @@ class FakePortContext(object):
 
     def set_binding(self, segment_id, vif_type, cap_port_filter):
         pass
+
+    @property
+    def host(self):
+        return self._port.get(portbindings.HOST_ID)
+
+    @property
+    def original_host(self):
+        return self._original_port.get(portbindings.HOST_ID)