[EX] Power over Ethernet (PoE) switch troubleshooting

Check the POE configuration for the interface which is not getting power:

{master:0}[edit poe]
user@switch# show
Interface all; <-- All interfaces are configure for POE

Check the output, “show poe controller”. This output will show the power consumption of the POE devices.

user@switch> show poe controller
Controller  Maximum   Power         Guard    Management  Status   Lldp
index       power     consumption   band                          Priority
   0**      130.00W     2.28W           0W     Class      AF_MODE  Disabled

The above output shows that switch is providing power to end device and consumption is 2.28W.

If the output shows to upgrade POE firmware, proceed with an upgrade of POE firmware.

user@switch> show poe controller
Controller Maximum   Power         Guard    Management   Status        Lldp
index       power     consumption   band                                Priority
   0**      130.00W   2.28W           0W     Class        AF_MODE       Disabled
  **New PoE software upgrade available.
Use 'request system firmware upgrade poe fpc-slot <slot>'

This procedure will take around 10 minutes (recommended to be performed during maintenance)
Use the following command to upgrade the PoE firmware:

request system firmware upgrade poe fpc-slot <slot>

Note: JTAC recommends to upgrade POE firmware during maintenance window.

Check the POE enabled interface using “show poe interfaces” :

Working scenario output:

user@switch> show poe interface
Interface    Admin       Oper    Max        Priority       Power          Class
             status      status  power                     consumption
 ge-0/0/4    Enabled      ON     15.4W      Low            2.3W            3

Non-working scenario Output:

user@switch> show poe interface
Interface    Admin       Oper    Max        Priority       Power          Class
             status      status  power                     consumption
ge-0/0/0    Enabled     OFF     15.4W      Low            0.0W          not-applicable

Check the interface operational status where POE devices are connected.

user@switch> show poe interface ge-0/0/0
PoE interface status:
PoE interface                :  ge-0/0/0
Administrative status        : Enabled <-- POE is enabled
Operational status           : OFF <-- This shows POE is enabled but no power supplied.
Power limit on the interface : 15.4W
Priority                     : Low
Power consumed               : 0.0W
Class of power device        : not-applicable
PoE Mode                     :  802.3af

If the operational status shows OFF, flap the interface and check the status if the device is consuming the power or not.

Check for power consumption history for that particular POE interface:

user@switch> show poe telemetries interface ge-0/0/4
Sl No    Timestamp                Power    Voltage
   1     01-21-2010 19:51:00 UTC  2.3W     50.6V
   2     01-21-2010 19:50:00 UTC  2.3W     50.6V
   3     01-21-2010 19:49:00 UTC  2.4W     50.7V
   4     01-21-2010 19:21:00 UTC  0.0W     50.8V
   5     01-21-2010 19:20:00 UTC  0.0W     50.7V

Assign static power to the PoE interface and check the status (set the maximum PoE wattage available i.e 15.4W)

user@switch# set poe interface <interface-name> maximum-power <power in watts>

If switch will not provide power after configuring static power, then please open a case with JTAC.

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