diff --git a/osm_ro/vim_thread.py b/osm_ro/vim_thread.py
index 373fe7b..8a987ac 100644
--- a/osm_ro/vim_thread.py
+++ b/osm_ro/vim_thread.py
@@ -161,7 +161,7 @@
                                     FROM="instance_interfaces as ii left join instance_nets as ine on "
                                          "ii.instance_net_id=ine.uuid left join instance_vms as iv on "
                                          "ii.instance_vm_id=iv.uuid",
-                                    SELECT=("ii.uuid as iface_id", "ine.uuid as net_id", "iv.uuid as vm_id", "sdn_net_id"),
+                                    SELECT=("ii.uuid as iface_id", "ine.uuid as net_id", "iv.uuid as vm_id", "sdn_net_id", "vim_net_id"),
                                     WHERE=where_)
                             if len(db_ifaces)>1:
                                 self.logger.critical("Refresing interfaces. "
@@ -172,6 +172,14 @@
                                 continue
                             else:
                                 db_iface = db_ifaces[0]
+                                #If there is no sdn_net_id, check if it is because an already created vim network is being used
+                                #in that case, the sdn_net_id will be in that entry of the instance_nets table
+                                if not db_iface.get("sdn_net_id"):
+                                    result = self.db.get_rows(SELECT=('sdn_net_id',), FROM='instance_nets',
+                                                                  WHERE={'vim_net_id': db_iface.get("vim_net_id"), 'instance_scenario_id': None, "datacenter_tenant_id":  self.datacenter_tenant_id})
+                                    if len(result) == 1:
+                                        db_iface["sdn_net_id"] = result[0]['sdn_net_id']
+
                                 if db_iface.get("sdn_net_id") and interface.get("compute_node") and interface.get("pci"):
                                     sdn_net_id = db_iface["sdn_net_id"]
                                     sdn_port_name = sdn_net_id + "." + db_iface["vm_id"]
@@ -549,6 +557,20 @@
             self._remove_refresh("get-net", net_id)
             result = self.vim.delete_network(net_id)
             if sdn_net_id:
+                #Delete any attached port to this sdn network
+                #At this point, there will be ports associated to this network in case it was manually done using 'openmano vim-net-sdn-attach'
+                try:
+                    port_list = self.ovim.get_ports(columns={'uuid'}, filter={'name': 'external_port', 'net_id': sdn_net_id})
+                except ovimException as e:
+                    raise vimconn.vimconnException(
+                        "ovimException obtaining external ports for net {}. ".format(sdn_net_id) + str(e))
+
+                for port in port_list:
+                    try:
+                        self.ovim.delete_port(port['uuid'])
+                    except ovimException as e:
+                        raise vimconn.vimconnException(
+                            "ovimException deleting port {} for net {}. ".format(port['uuid'], sdn_net_id) + str(e))
                 with self.db_lock:
                     self.ovim.delete_network(sdn_net_id)
             return True, result