diff --git a/html/includes/graphs/device/bits.inc.php b/html/includes/graphs/device/bits.inc.php
index 279f4ed004..969334134f 100644
--- a/html/includes/graphs/device/bits.inc.php
+++ b/html/includes/graphs/device/bits.inc.php
@@ -8,6 +8,12 @@ foreach (dbFetchRows('SELECT * FROM `ports` WHERE `device_id` = ? AND `disabled`
     $ignore = 0;
     if (is_array($config['device_traffic_iftype'])) {
         foreach ($config['device_traffic_iftype'] as $iftype) {
+            if ($iftype == '/l2vlan/' && $device['os']=='asa') {
+                // ASA (at least in multicontext) reports all interfaces as l2vlan even if they are l3
+                // so every context has no graph displayed unless l2vlan are accepted for all.
+                // This patch will ignore l2vlan for ASA.
+                continue;
+            }
             if (preg_match($iftype.'i', $port['ifType'])) {
                 $ignore = 1;
             }