diff --git a/doc/source/usage.rst b/doc/source/usage.rst
index cfde183..d7ec56f 100644
--- a/doc/source/usage.rst
+++ b/doc/source/usage.rst
@@ -72,10 +72,12 @@ VMTP Usage
                             throughput test duration in seconds (default 10 sec)
       --host <user>@<host_ssh_ip>[:<server-listen-if-name>]
                             native host throughput (targets requires ssh key)
-      --external-host <user>@<ext_host_ssh_ip>
-                            external-VM throughput (target requires ssh key)
-      --access_info '{"host":"<hostip>", "user":"<user>", "password":"<pass>"}'
-                            access info for the controller node
+      --external-host <user>@<host_ssh_ip>[:password>]
+                            external-VM throughput (host requires public key if no
+                            password)
+      --controller-node <user>@<host_ssh_ip>[:<password>]
+                            controller node ssh (host requires public key if no
+                            password)
       --mongod_server <server ip>
                             provide mongoDB server IP to store results
       --json <file>         store results in json format file
diff --git a/network.py b/network.py
index f233243..bf413f8 100755
--- a/network.py
+++ b/network.py
@@ -16,7 +16,8 @@
 import time
 
 # Module containing a helper class for operating on OpenStack networks
-import neutronclient.common.exceptions as neutron_exceptions
+from neutronclient.common.exceptions import NetworkInUseClient
+from neutronclient.common.exceptions import NeutronException
 
 class Network(object):
 
@@ -149,7 +150,7 @@ class Network(object):
                     self.neutron_client.delete_network(network['id'])
                     print 'Network %s deleted' % (name)
                     break
-                except neutron_exceptions.NetworkInUseClient:
+                except NetworkInUseClient:
                     time.sleep(1)
 
     # Add a network/subnet to a logical router
@@ -187,8 +188,13 @@ class Network(object):
                 body = {
                     'subnet_id': int_net['subnets'][0]
                 }
-                self.neutron_client.remove_interface_router(self.ext_router['id'],
-                                                            body)
+                try:
+                    self.neutron_client.remove_interface_router(self.ext_router['id'],
+                                                                body)
+                except NeutronException:
+                    # May fail with neutronclient.common.exceptions.Conflict
+                    # if there are floating IP in use - just ignore
+                    print('Router interface may have floating IP in use: not deleted')
 
     # Lookup network given network name
     def lookup_network(self, network_name):
diff --git a/vmtp.py b/vmtp.py
index 8b17d16..f44f9c4 100755
--- a/vmtp.py
+++ b/vmtp.py
@@ -37,6 +37,7 @@ from glanceclient.v2 import client as glanceclient
 from keystoneclient.v2_0 import client as keystoneclient
 from neutronclient.v2_0 import client as neutronclient
 from novaclient.client import Client
+from novaclient.exceptions import ClientException
 
 __version__ = '2.0.0'
 
@@ -370,7 +371,7 @@ class VmtpTest(object):
                 self.client = None
 
         # If external network is specified run that case
-        if ext_host_list:
+        if ext_host_list[0]:
             self.ext_host_tp_test()
 
     def teardown(self):
@@ -388,7 +389,11 @@ class VmtpTest(object):
         if self.comp:
             self.comp.remove_public_key(config.public_key_name)
         # Finally remove the security group
-        self.comp.security_group_delete(self.sec_group)
+        try:
+            self.comp.security_group_delete(self.sec_group)
+        except ClientException:
+            # May throw novaclient.exceptions.BadRequest if in use
+            print('Security group in use: not deleted')
 
     def run(self):
         error_flag = False
@@ -398,10 +403,7 @@ class VmtpTest(object):
             self.measure_vm_flows()
         except KeyboardInterrupt:
             traceback.format_exc()
-        except VmtpException:
-            traceback.format_exc()
-            error_flag = True
-        except sshutils.SSHError:
+        except (VmtpException, sshutils.SSHError, ClientException):
             traceback.format_exc()
             error_flag = True