network::cisco::standard::snmp::plugin : warning/critical speed

Hi all,
I'd like to check the speed of a switch port and put thresholds (warning at 100Mbps and critical at 10Mbps)
Here's the command line :
Port 1 :
perl centreon_plugins.pl --plugin=network::cisco::standard::snmp::plugin --mode=interfaces --add-speed --interface=10104 --hostname=10.100.0.11 --warning-speed=100000 --critical-speed=10000
the ouput :
CRITICAL: Interface 'Gi1/0/4' Speed : 1.00Gb/s | 'speed'=1000000000b/s;0:100000;0:10000;0;
Port 2 :
perl centreon_plugins.pl --plugin=network::cisco::standard::snmp::plugin --mode=interfaces --add-speed --interface=10119 --hostname=10.100.0.11 --warning-speed=100000 --critical-speed=10000
the ouput :
CRITICAL: Interface 'Gi1/0/19' Speed : 100.00Mb/s | 'speed'=100000000b/s;0:100000;0:10000;0;

Not sure I understood the way it should work
Do you have an example that works ?

Many thanks for your answer