diff --git a/manila_tempest_tests/tests/api/admin/test_share_servers.py b/manila_tempest_tests/tests/api/admin/test_share_servers.py
index 0c784e9..c387ed2 100644
--- a/manila_tempest_tests/tests/api/admin/test_share_servers.py
+++ b/manila_tempest_tests/tests/api/admin/test_share_servers.py
@@ -195,6 +195,9 @@
 
     @tc.attr(base.TAG_POSITIVE, base.TAG_API_WITH_BACKEND)
     @ddt.data(True, False)
+    @testtools.skipIf(CONF.share.share_network_id != "",
+                      "This test is not suitable for pre-existing "
+                      "share_network.")
     def test_delete_share_server(self, delete_share_network):
         # Get network and subnet from existing share_network and reuse it
         # to be able to delete share_server after test ends.
diff --git a/manila_tempest_tests/tests/api/base.py b/manila_tempest_tests/tests/api/base.py
index 94e496a..e81c5d4 100644
--- a/manila_tempest_tests/tests/api/base.py
+++ b/manila_tempest_tests/tests/api/base.py
@@ -423,7 +423,9 @@
                       cleanup_in_class=True, is_public=False, **kwargs):
         client = client or cls.shares_v2_client
         description = description or "Tempest's share"
-        share_network_id = share_network_id or client.share_network_id or None
+        share_network_id = (share_network_id or
+                            CONF.share.share_network_id or
+                            client.share_network_id or None)
         metadata = metadata or {}
         size = size or CONF.share.share_size
         kwargs.update({
@@ -905,9 +907,10 @@
                     elif res["type"] is "snapshot":
                         client.delete_snapshot(res_id)
                         client.wait_for_resource_deletion(snapshot_id=res_id)
-                    elif res["type"] is "share_network":
-                        client.delete_share_network(res_id)
-                        client.wait_for_resource_deletion(sn_id=res_id)
+                    elif (res["type"] is "share_network" and
+                            res_id != CONF.share.share_network_id):
+                            client.delete_share_network(res_id)
+                            client.wait_for_resource_deletion(sn_id=res_id)
                     elif res["type"] is "security_service":
                         client.delete_security_service(res_id)
                         client.wait_for_resource_deletion(ss_id=res_id)
diff --git a/manila_tempest_tests/tests/api/test_share_networks_negative.py b/manila_tempest_tests/tests/api/test_share_networks_negative.py
index e7e3df4..5fdc684 100644
--- a/manila_tempest_tests/tests/api/test_share_networks_negative.py
+++ b/manila_tempest_tests/tests/api/test_share_networks_negative.py
@@ -111,6 +111,9 @@
     @testtools.skipIf(not CONF.share.multitenancy_enabled,
                       'Can run only with drivers that do handle share servers '
                       'creation. Skipping.')
+    @testtools.skipIf(CONF.share.share_network_id != "",
+                      "This test is not suitable for pre-existing "
+                      "share_network.")
     def test_try_delete_share_network_with_existing_shares(self):
         # Get valid network data for successful share creation
         share_network = self.shares_client.get_share_network(