diff --git a/includes/polling/functions.inc.php b/includes/polling/functions.inc.php
index 84fb185572..36ba1a009e 100644
--- a/includes/polling/functions.inc.php
+++ b/includes/polling/functions.inc.php
@@ -467,6 +467,8 @@ function get_main_serial($device)
         $serial_output = snmp_get_multi($device, 'entPhysicalSerialNum.1 entPhysicalSerialNum.1001', '-OQUs', 'ENTITY-MIB:OLD-CISCO-CHASSIS-MIB');
         if (!empty($serial_output[1]['entPhysicalSerialNum'])) {
             return $serial_output[1]['entPhysicalSerialNum'];
+        } elseif (!empty($serial_output[1000]['entPhysicalSerialNum'])) {
+            return $serial_output[1000]['entPhysicalSerialNum'];
         } elseif (!empty($serial_output[1001]['entPhysicalSerialNum'])) {
             return $serial_output[1001]['entPhysicalSerialNum'];
         }
diff --git a/includes/polling/os/ios.inc.php b/includes/polling/os/ios.inc.php
index 3d323a76a3..be392e59e6 100644
--- a/includes/polling/os/ios.inc.php
+++ b/includes/polling/os/ios.inc.php
@@ -34,7 +34,12 @@ if ($data[1]['entPhysicalContainedIn'] == '0') {
         $hardware = $data[1]['entPhysicalModelName'];
     }
 }
-if (!empty($data[1001]['entPhysicalModelName'])) {
+
+if (!empty($data[1000]['entPhysicalModelName'])) {
+    $hardware = $data[1000]['entPhysicalModelName'];
+} elseif (!empty($data[1000]['entPhysicalContainedIn'])) {
+    $hardware = $data[$data[1000]['entPhysicalContainedIn']]['entPhysicalName'];
+} elseif (!empty($data[1001]['entPhysicalModelName'])) {
     $hardware = $data[1001]['entPhysicalModelName'];
 } elseif (!empty($data[1001]['entPhysicalContainedIn'])) {
     $hardware = $data[$data[1001]['entPhysicalContainedIn']]['entPhysicalName'];