diff --git a/network/hp/procurve/mode/environment.pm b/network/hp/procurve/mode/environment.pm
index 731c74cc4..e3c6e9c27 100644
--- a/network/hp/procurve/mode/environment.pm
+++ b/network/hp/procurve/mode/environment.pm
@@ -63,7 +63,8 @@ sub new {
     
     $self->{version} = '1.0';
     $options{options}->add_options(arguments =>
-                                { 
+                                {
+                                    "skip-not-present"           => { name => 'skip_not_present' },
                                 });
 
     return $self;
@@ -100,6 +101,12 @@ sub run {
         $self->{output}->output_add(long_msg => sprintf("%s sensor '%s' state is %s.", 
                                                         $object_map{$object}, $instance,
                                                         ${$states{$status}}[0]));
+        if (defined($self->{option_results}->{skip_not_present}) &&
+            $status == 5) {
+            $self->{output}->output_add(long_msg => sprintf("Skipping %s sensor '%s'.",
+                                                            $object_map{$object}, $instance));
+            next;
+        }
         if (${$states{$status}}[1] ne 'OK') {
             $self->{output}->output_add(severity  => ${$states{$status}}[1],
                                         short_msg => sprintf("%s sensor '%s' state is %s.", 
@@ -122,6 +129,10 @@ Check sensors (hpicfChassis.mib).
 
 =over 8
 
+=item B<--skip-not-present>
+
+No warning for state 'not present'.
+
 =back
 
 =cut
diff --git a/network/hp/procurve/plugin.pm b/network/hp/procurve/plugin.pm
index ec3239f61..66b8219a9 100644
--- a/network/hp/procurve/plugin.pm
+++ b/network/hp/procurve/plugin.pm
@@ -47,10 +47,11 @@ sub new {
 
     $self->{version} = '1.0';
     %{$self->{modes}} = (
-                         'cpu'          => 'network::hp::procurve::mode::cpu',
-                         'environment'  => 'network::hp::procurve::mode::environment',
-                         'memory'       => 'network::hp::procurve::mode::memory',
-                         'traffic'      => 'snmp_standard::mode::traffic',
+                         'cpu'              => 'network::hp::procurve::mode::cpu',
+                         'environment'      => 'network::hp::procurve::mode::environment',
+                         'memory'           => 'network::hp::procurve::mode::memory',
+                         'traffic'          => 'snmp_standard::mode::traffic',
+                         'list-interfaces'  => 'snmp_standard::mode::listinterfaces',
                          );
 
     return $self;
diff --git a/snmp_standard/mode/traffic.pm b/snmp_standard/mode/traffic.pm
index 7e1b1462b..beff6b8f2 100644
--- a/snmp_standard/mode/traffic.pm
+++ b/snmp_standard/mode/traffic.pm
@@ -153,7 +153,7 @@ sub run {
 
     my $result = $self->{snmp}->get_leef();
     $new_datas->{last_timestamp} = time();
-    my $old_timestamp;
+    my $old_timestamp = $self->{statefile_value}->get(name => 'last_timestamp');
     if (!defined($self->{option_results}->{interface}) || defined($self->{option_results}->{use_regexp})) {
         $self->{output}->output_add(severity => 'OK',
                                     short_msg => 'All traffic are ok');
@@ -175,6 +175,8 @@ sub run {
             }
             $interface_speed = (defined($result->{$oid_speed64 . "." . $_}) && $result->{$oid_speed64 . "." . $_} ne '' ? ($result->{$oid_speed64 . "." . $_} * 1000000) : ($result->{$oid_speed32 . "." . $_}));
             if ($interface_speed == 0) {
+                $self->{output}->output_add(severity => 'UNKNOWN',
+                                            short_msg => "Interface '" . $display_value . "' Speed is 0. You should force the value with --speed option");
                 next;
             }
         }
@@ -214,7 +216,6 @@ sub run {
             next;
         }
         
-        $old_timestamp = $self->{statefile_value}->get(name => 'last_timestamp');
         my $old_in = $self->{statefile_value}->get(name => 'in_' . $_);
         my $old_out = $self->{statefile_value}->get(name => 'out_' . $_);
         if (!defined($old_timestamp) || !defined($old_in) || !defined($old_out)) {