diff --git a/neutron_tempest_plugin/scenario/base.py b/neutron_tempest_plugin/scenario/base.py
index 6dcc169..752e536 100644
--- a/neutron_tempest_plugin/scenario/base.py
+++ b/neutron_tempest_plugin/scenario/base.py
@@ -307,13 +307,19 @@
             self._log_ns_network_status(ns_name=ns_name)
 
     def _log_ns_network_status(self, ns_name=None):
-        local_ips = ip_utils.IPCommand(namespace=ns_name).list_addresses()
+        try:
+            local_ips = ip_utils.IPCommand(namespace=ns_name).list_addresses()
+            local_routes = ip_utils.IPCommand(namespace=ns_name).list_routes()
+            arp_table = ip_utils.arp_table()
+        except exceptions.ShellCommandFailed:
+            LOG.debug('Namespace %s has been deleted synchronously during the '
+                      'host network collection process', ns_name)
+            return
+
         LOG.debug('Namespace %s; IP Addresses:\n%s',
                   ns_name, '\n'.join(str(r) for r in local_ips))
-        local_routes = ip_utils.IPCommand(namespace=ns_name).list_routes()
         LOG.debug('Namespace %s; Local routes:\n%s',
                   ns_name, '\n'.join(str(r) for r in local_routes))
-        arp_table = ip_utils.arp_table()
         LOG.debug('Namespace %s; Local ARP table:\n%s',
                   ns_name, '\n'.join(str(r) for r in arp_table))
 
diff --git a/tox.ini b/tox.ini
index eecd16e..3c18fbf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@
    OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:true}
    OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:true}
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}