Index: includes/defaults.inc.php
===================================================================
--- includes/defaults.inc.php	(revision 6161)
+++ includes/defaults.inc.php	(working copy)
@@ -513,6 +513,7 @@
 $config['device_traffic_iftype'][] = '/ieee8023adLag/';
 $config['device_traffic_iftype'][] = '/l2vlan/';
 $config['device_traffic_iftype'][] = '/ppp/';
+$config['device_traffic_iftype'][] = '/propMultiplexor/';
 
 $config['device_traffic_descr'][]  = '/loopback/';
 $config['device_traffic_descr'][]  = '/vlan/';