Override layers in Juniper for routers with switch modules not reporting L2 capability

Info/Layer3/Juniper.pm

@@ -89,6 +89,20 @@ sub os {
     return 'junos';
 }
 
+sub layers {
+    my $juniper = shift;
+    
+    my $layers = $juniper->SUPER::layers();
+    # Some models don't report L2 properly 
+    my $macs   = $juniper->fw_mac();
+    
+    if (keys %$macs) {
+        my $l = substr $layers, 6, 1, "1";
+    }
+
+    return $layers;
+}
+
 sub os_ver {
     my $juniper = shift;
 
@@ -590,6 +604,11 @@ Returns 'juniper'
 
 Returns 'junos'
 
+=item $juniper->layers()
+
+Checks forwarding table for Layer 2 support since some routers with switches
+do not report layers properly.
+
 =item $juniper->os_ver()
 
 Returns the software version extracted first from C<sysDescr> or