diff --git a/Info/Layer3/AlteonAD.pm b/Info/Layer3/AlteonAD.pm
index 9b733d1e..5ba3372a 100644
--- a/Info/Layer3/AlteonAD.pm
+++ b/Info/Layer3/AlteonAD.pm
@@ -385,6 +385,20 @@ sub i_vlan_membership {
     return $i_vlan_membership;
 }
 
+sub i_vlan_membership_untagged {
+    my $alteon  = shift;
+    my $partial = shift;
+
+    my $vlans = $alteon->i_vlan($partial);
+    my $i_vlan_membership = {};
+    foreach my $port (keys %$vlans) {
+        my $vlan = $vlans->{$port};
+        push( @{ $i_vlan_membership->{$port} }, $vlan );
+    }
+    
+    return $i_vlan_membership;
+}
+
 # Bridge MIB does not map Bridge Port to ifIndex correctly on some code
 # versions
 sub bp_index {
@@ -574,6 +588,12 @@ IDs.  These are the VLANs which are members of the egress list for the port.
     print "Port: $port VLAN: $vlan\n";
   }
 
+=item $alteon->i_vlan_membership_untagged()
+
+Returns reference to hash of arrays: key = C<ifIndex>, value = array of VLAN
+IDs.  These are the VLANs which are members of the untagged egress list for
+the port.
+
 =item $alteon->v_index()
 
 Returns VLAN IDs