--->Current status
: sfputil show lpmode                                                                                                                                      Thu Oct 26 03:44:44 2017

Port         Low-power Mode
-----------  ----------------
Ethernet0    On
Ethernet4    On
Ethernet8    On
Ethernet12   On
Ethernet16   On
Ethernet20   On
Ethernet24   On
Ethernet28   On
Ethernet32   On
Ethernet36   On
Ethernet40   On
Ethernet44   On
Ethernet48   On
Ethernet52   On
Ethernet56   On
Ethernet60   On
Ethernet64   On
Ethernet68   On
Ethernet72   On
Ethernet76   On
Ethernet80   On
Ethernet84   On
Ethernet88   On
Ethernet92   On
Ethernet96   On
Ethernet100  On
Ethernet104  On
Ethernet108  On
Ethernet112  On
Ethernet116  On
Ethernet120  On
Ethernet124  On

-->Toggle lpmode to Port 80

root@sonic:/usr/share/sonic/device/x86_64-dell_z9100_c2538-r0/plugins# sfputil lpmode off Ethernet80
Disabling low-power mode for port Ethernet80...  OK

Every 1.0s: sfputil show lpmode                                                                                                                                      Thu Oct 26 03:45:45 2017

Port         Low-power Mode
-----------  ----------------
Ethernet0    On
Ethernet4    On
Ethernet8    On
Ethernet12   On
Ethernet16   On
Ethernet20   On
Ethernet24   On
Ethernet28   On
Ethernet32   On
Ethernet36   On
Ethernet40   On
Ethernet44   On
Ethernet48   On
Ethernet52   On
Ethernet56   On
Ethernet60   On
Ethernet64   On
Ethernet68   On
Ethernet72   On
Ethernet76   On
Ethernet80   Off
Ethernet84   On
Ethernet88   On
Ethernet92   On
Ethernet96   On
Ethernet100  On
Ethernet104  On
Ethernet108  On
Ethernet112  On
Ethernet116  On
Ethernet120  On
Ethernet124  On


--->Reset Eth80 for old status

root@sonic:/usr/share/sonic/device/x86_64-dell_z9100_c2538-r0/plugins# sfputil reset Ethernet80
Resetting port Ethernet80...  OK

Every 1.0s: sfputil show lpmode                                                                                                                                      Thu Oct 26 03:47:20 2017

Port         Low-power Mode
-----------  ----------------
Ethernet0    On
Ethernet4    On
Ethernet8    On
Ethernet12   On
Ethernet16   On
Ethernet20   On
Ethernet24   On
Ethernet28   On
Ethernet32   On
Ethernet36   On
Ethernet40   On
Ethernet44   On
Ethernet48   On
Ethernet52   On
Ethernet56   On
Ethernet60   On
Ethernet64   On
Ethernet68   On
Ethernet72   On
Ethernet76   On
Ethernet80   On
Ethernet84   On
Ethernet88   On
Ethernet92   On
Ethernet96   On
Ethernet100  On
Ethernet104  On
Ethernet108  On
Ethernet112  On
Ethernet116  On
Ethernet120  On
Ethernet124  On