diff --git a/neutron/plugins/nicira/common/exceptions.py b/neutron/plugins/nicira/common/exceptions.py
index 0c34010406..841655ca1c 100644
--- a/neutron/plugins/nicira/common/exceptions.py
+++ b/neutron/plugins/nicira/common/exceptions.py
@@ -52,3 +52,7 @@ class NvpNatRuleMismatch(NvpPluginException):
     message = _("While retrieving NAT rules, %(actual_rules)s were found "
                 "whereas rules in the (%(min_rules)s,%(max_rules)s) interval "
                 "were expected")
+
+
+class NvpInvalidAttachmentType(NvpPluginException):
+    message = _("Invalid NVP attachment type '%(attachment_type)s'")
diff --git a/neutron/plugins/nicira/nvplib.py b/neutron/plugins/nicira/nvplib.py
index 00a184f062..0eecd8118b 100644
--- a/neutron/plugins/nicira/nvplib.py
+++ b/neutron/plugins/nicira/nvplib.py
@@ -866,9 +866,8 @@ def plug_router_port_attachment(cluster, router_id, port_id,
         if attachment_vlan:
             attach_obj['vlan_id'] = attachment_vlan
     else:
-        # TODO(salv-orlando): avoid raising generic exception
-        raise Exception(_("Invalid NVP attachment type '%s'"),
-                        nvp_attachment_type)
+        raise nvp_exc.NvpInvalidAttachmentType(
+            attachment_type=nvp_attachment_type)
     return do_request(HTTP_PUT, uri, json.dumps(attach_obj), cluster=cluster)
 
 
diff --git a/neutron/tests/unit/nicira/test_nvplib.py b/neutron/tests/unit/nicira/test_nvplib.py
index e3c4a97a15..fef5b5ca86 100644
--- a/neutron/tests/unit/nicira/test_nvplib.py
+++ b/neutron/tests/unit/nicira/test_nvplib.py
@@ -902,7 +902,7 @@ class TestNvplibLogicalRouters(NvplibTestCase):
         lrouter_port = nvplib.create_router_lport(
             self.fake_cluster, lrouter['uuid'], 'pippo', 'neutron_port_id',
             'name', True, ['192.168.0.1'])
-        self.assertRaises(Exception,
+        self.assertRaises(nvp_exc.NvpInvalidAttachmentType,
                           nvplib.plug_router_port_attachment,
                           self.fake_cluster, lrouter['uuid'],
                           lrouter_port['uuid'], 'gw_att', 'BadType')
@@ -965,7 +965,7 @@ class TestNvplibLogicalRouters(NvplibTestCase):
         with mock.patch.object(self.fake_cluster.api_client,
                                'get_nvp_version',
                                new=lambda: '2.0'):
-            self.assertRaises(Exception,
+            self.assertRaises(AttributeError,
                               nvplib.create_lrouter_snat_rule,
                               self.fake_cluster, lrouter['uuid'],
                               '10.0.0.2', '10.0.0.2', order=200,