diff --git a/whitebox_neutron_tempest_plugin/config.py b/whitebox_neutron_tempest_plugin/config.py
index b29265c..09e194e 100644
--- a/whitebox_neutron_tempest_plugin/config.py
+++ b/whitebox_neutron_tempest_plugin/config.py
@@ -121,9 +121,9 @@ WhiteboxNeutronPluginOptions = [
                default='/etc/neutron/plugins/ml2/ml2_conf.ini',
                help='Path to ml2 plugin config.'),
     cfg.StrOpt('ext_bridge',
-               default='{"default": "ospbr", "alt": "br-ex"}',
-               help="Bridge dedicated for external network. Dict with values "
-                    "for default node and alternative node (if exist)."),
+               default='br-ex',
+               help="Bridge dedicated for external network. It is used for "
+                    "capturing traffic for routing tests."),
     cfg.StrOpt('node_ext_interface',
                default=None,
                help='Physical interface of a node that is connected to the'
diff --git a/whitebox_neutron_tempest_plugin/tests/scenario/base.py b/whitebox_neutron_tempest_plugin/tests/scenario/base.py
index f327723..dc064b5 100644
--- a/whitebox_neutron_tempest_plugin/tests/scenario/base.py
+++ b/whitebox_neutron_tempest_plugin/tests/scenario/base.py
@@ -14,7 +14,6 @@
 #    under the License.
 import base64
 from functools import partial
-import json
 from multiprocessing import Process
 import os
 import random
@@ -70,7 +69,6 @@ class BaseTempestWhiteboxTestCase(base.BaseTempestTestCase):
         sriov_agents = [
             agent for agent in agents if 'sriov' in agent['binary']]
         cls.has_sriov_support = True if sriov_agents else False
-        cls.ext_bridge = json.loads(WB_CONF.ext_bridge)
         cls.neutron_conf = local_constants.NEUTRON_CONF[WB_CONF.openstack_type]
         # deployer tool dependent variables
         if WB_CONF.openstack_type == 'devstack':
@@ -122,16 +120,6 @@ class BaseTempestWhiteboxTestCase(base.BaseTempestTestCase):
                         subnet['ip_version'] == constants.IP_VERSION_4):
                     return subnet['gateway_ip']
 
-    def get_external_bridge(self, client):
-        commands = [
-            "sudo ip -o link show type bridge | cut -d ' ' -f 2 | tr -d ':'",
-            "sudo ovs-vsctl list-br"]
-        for cmd in commands:
-            result = client.exec_command(cmd).strip().split()
-            if self.ext_bridge['default'] in result:
-                return self.ext_bridge['default']
-        return self.ext_bridge['alt']
-
     @staticmethod
     def get_node_client(
             host, username=WB_CONF.overcloud_ssh_user, pkey=None,
@@ -1048,22 +1036,12 @@ class TrafficFlowTest(BaseTempestWhiteboxTestCase):
 
     def _start_captures(self, filters, interface=None):
         def get_interface(client):
-            # (rsafrono) discover interfaces, useful when capturing on
-            # nodes and different types of nodes have different interfaces,
-            # e.g. on podified environment ocp and compute have different
-            # names of interfaces connected to external network
-            bridge = self.get_external_bridge(client)
-            filters = [r"| grep 'eth\|enp\|ens' | grep -v veth ",
-                       "| cut -f2 -d ' ' | tr -d ':'"]
-            commands = [
-                "sudo ovs-vsctl list-ports " + bridge + filters[0],
-                "sudo ip -o link show master " + bridge + filters[0] +
-                filters[1]]
-            for cmd in commands:
-                interfaces = client.exec_command(
-                    cmd + " || true").strip().split()
-                if interfaces:
-                    return ','.join(interfaces)
+            interfaces = client.exec_command(
+                "sudo ovs-vsctl list-ports " + WB_CONF.ext_bridge +
+                r"| grep 'eth\|enp\|ens' | grep -v veth " +
+                "|| true").strip().split()
+            if interfaces:
+                return ','.join(interfaces)
 
         for node in self.nodes:
             if not (node['is_controller'] or