diff --git a/html/includes/graphs/device/mib.inc.php b/html/includes/graphs/device/mib.inc.php
index 21fe1d7ee..b97cca855 100644
--- a/html/includes/graphs/device/mib.inc.php
+++ b/html/includes/graphs/device/mib.inc.php
@@ -13,8 +13,10 @@
  */
 
 $rrd_list = array();
-$prefix   = rrd_name($device['hostname'], array($subtype, ''), '');
-foreach (glob($prefix.'*.rrd') as $filename) {
+$prefix    = rrd_name($device['hostname'], array($subtype, ''), '');
+$filenames = glob($prefix."*.rrd");
+$count     = count($filenames);
+foreach ($filenames as $filename) {
     // find out what * expanded to
     $globpart = str_replace($prefix, '', $filename);    // take off the prefix
     $instance = substr($globpart, 0, -4);               // take off ".rrd"
@@ -27,9 +29,19 @@ foreach (glob($prefix.'*.rrd') as $filename) {
     $rrd_list[]     = $ds;
 }
 
-$colours    = 'mixed';
 $scale_min  = '0';
-$nototal    = 0;
 $simple_rrd = true;
 
-require 'includes/graphs/generic_multi_line.inc.php';
+// If there are multiple matching files, use a stacked graph instead of a line graph
+if ($count > 1) {
+    $nototal = 1;
+    $divider = $count;
+    $text_orig = 1;
+    $colours = 'manycolours';
+    include "includes/graphs/generic_multi_simplex_seperated.inc.php";
+}
+else {
+    $colours = 'mixed';
+    $nototal = 0;
+    include "includes/graphs/generic_multi_line.inc.php";
+}
diff --git a/includes/defaults.inc.php b/includes/defaults.inc.php
index 407402746..4c93db9d1 100644
--- a/includes/defaults.inc.php
+++ b/includes/defaults.inc.php
@@ -315,6 +315,17 @@ $config['graph_colours']['purples'] = array(
 );
 $config['graph_colours']['default'] = $config['graph_colours']['blues'];
 
+// Colour values from http://www.sapdesignguild.org/goodies/diagram_guidelines/color_palettes.html
+$config['graph_colours']['manycolours'] = array(
+    "FFF8A3", "FAE16B", "F8D753", "F3C01C", "F0B400",   // yellows
+    "A9CC8F", "82B16A", "5C9746", "3D8128", "1E6C0B",   // greens
+    "B2C8D9", "779DBF", "3E75A7", "205F9A", "00488C",   // blues
+    "BEA37A", "907A52", "7A653E", "63522B", "3D3000",   // browns
+    "F3AA79", "EB8953", "E1662A", "DC5313", "D84000",   // oranges
+    "B5B5A9", "8B8D82", "74796F", "5D645A", "434C43",   // greys
+    "E6A4A5", "D6707B", "C4384F", "BC1C39", "B30023",   // pinks
+);
+
 // Map colors
 $config['network_map_legend'] = array(
     '0'   => '#aeaeae',