diff --git a/network/zyxel/snmp/mode/sessions.pm b/network/zyxel/snmp/mode/sessions.pm
new file mode 100644
index 000000000..a26c71883
--- /dev/null
+++ b/network/zyxel/snmp/mode/sessions.pm
@@ -0,0 +1,92 @@
+#
+# Copyright 2017 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package network::zyxel::snmp::mode::sessions;
+
+use base qw(centreon::plugins::templates::counter);
+
+use strict;
+use warnings;
+
+sub set_counters {
+    my ($self, %options) = @_;
+    
+    $self->{maps_counters_type} = [
+        { name => 'global', type => 0 },
+    ];
+    
+    $self->{maps_counters}->{global} = [
+        { label => 'usage', set => {
+                key_values => [ { name => 'sessions' } ],
+                output_template => 'Current active sessions : %s',
+                perfdatas => [
+                    { label => 'sessions', value => 'sessions_absolute', template => '%s', min => 0 },
+                ],
+            }
+        },
+    ];
+}
+
+sub new {
+    my ($class, %options) = @_;
+    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
+    bless $self, $class;
+    
+    $self->{version} = '1.0';
+    $options{options}->add_options(arguments =>
+                                { 
+                                });
+    
+    return $self;
+}
+
+sub manage_selection {
+    my ($self, %options) = @_;
+
+    my $oid_sysSessionNum = '.1.3.6.1.4.1.890.1.6.22.1.6.0';
+    my $oid_sysActiveSessionNum = '.1.3.6.1.4.1.890.1.6.22.1.6.0';
+    my $snmp_result = $options{snmp}->get_leef(oids => [$oid_sysSessionNum, $oid_sysActiveSessionNum], nothing_quit => 1);
+
+    $self->{global} = { 
+        sessions => defined($snmp_result->{$oid_sysSessionNum}) ? $snmp_result->{$oid_sysSessionNum} : $snmp_result->{$oid_sysActiveSessionNum},
+    };
+}
+
+1;
+
+__END__
+
+=head1 MODE
+
+Check sessions.
+
+=over 8
+
+=item B<--warning-usage>
+
+Threshold warning.
+
+=item B<--critical-usage>
+
+Threshold critical.
+
+=back
+
+=cut
diff --git a/network/zyxel/snmp/plugin.pm b/network/zyxel/snmp/plugin.pm
index bc3358807..1a58c741b 100644
--- a/network/zyxel/snmp/plugin.pm
+++ b/network/zyxel/snmp/plugin.pm
@@ -36,6 +36,7 @@ sub new {
                          'list-interfaces'  => 'snmp_standard::mode::listinterfaces',
                          'list-vpn'         => 'network::zyxel::snmp::mode::listvpn',
                          'memory'           => 'network::zyxel::snmp::mode::memory',
+                         'sessions'         => 'network::zyxel::snmp::mode::sessions',
                          'vpn-status'       => 'network::zyxel::snmp::mode::vpnstatus',
                          );