diff --git a/murano/common/exceptions.py b/murano/common/exceptions.py
index 097a2098f..44258a0ac 100644
--- a/murano/common/exceptions.py
+++ b/murano/common/exceptions.py
@@ -62,3 +62,7 @@ class TimeoutException(Exception):
 
 class PolicyViolationException(Exception):
     pass
+
+
+class RouterInfoException(Exception):
+    pass
diff --git a/murano/engine/system/net_explorer.py b/murano/engine/system/net_explorer.py
index 8c48db1fb..35325f6be 100644
--- a/murano/engine/system/net_explorer.py
+++ b/murano/engine/system/net_explorer.py
@@ -19,7 +19,9 @@ from netaddr.strategy import ipv4
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import uuidutils
+import retrying
 
+from murano.common import exceptions as exc
 from murano.common.i18n import _LI
 from murano.dsl import dsl
 from murano.dsl import helpers
@@ -37,6 +39,12 @@ class NetworkExplorer(object):
         self._settings = CONF.networking
         self._available_cidrs = self._generate_possible_cidrs()
 
+    # NOTE(starodubcevna): to avoid simultaneous router requests we use retry
+    # decorator with random delay 1-10 seconds between attempts and maximum
+    # delay time 30 seconds.
+    @retrying.retry(retry_on_exception=exc.RouterInfoException,
+                    wait_random_min=1000, wait_random_max=10000,
+                    stop_max_delay=30000)
     def get_default_router(self):
         client = self._clients.get_neutron_client()
         router_name = self._settings.router_name
@@ -75,8 +83,8 @@ class NetworkExplorer(object):
                 raise KeyError('Router %s was not found' % router_name)
         else:
             if routers[0]['external_gateway_info'] is None:
-                raise Exception('Please set external gateway '
-                                'for the router %s ' % router_name)
+                raise exc.RouterInfoException('Please set external gateway for'
+                                              ' the router %s ' % router_name)
             router_id = routers[0]['id']
         return router_id
 
diff --git a/requirements.txt b/requirements.txt
index 4458ea5de..a1368ab4c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,7 @@ eventlet>=0.17.4
 PasteDeploy>=1.5.0
 Routes!=2.0,!=2.1,>=1.12.3;python_version=='2.7'
 Routes!=2.0,>=1.12.3;python_version!='2.7'
+retrying>=1.2.3,!=1.3.0 # Apache-2.0
 WebOb>=1.2.3
 kombu>=3.0.7
 psutil<2.0.0,>=1.1.1