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[EX] Power over Ethernet (PoE) operational status



Article ID: KB11273 KB Last Updated: 10 Aug 2020Version: 3.0
Power over Ethernet (PoE) allows devices to transfer electrical power via Ethernet cable.  A network switch or computer can supply power to components such as VoIP phones, wireless LAN access points, and other appliances.  This KB identifies various commands for verifying the operational state and utilization details of the EX switch PoE interface.

The following CLI commands can be used to verify the PoE status and utilization of the EX switch PoE interface.

PoE Commands:

lab@ex> show poe ?
Possible completions:
controller Show PoE system information
interface Show PoE interfaces
notification-control Show PoE notification information
telemetries Show PoE telemetries

Use the show chassis hardware command to determine the PoE capabilities of an EX-series switch:

lab@ex> show chassis hardware

Hardware inventory:
Item                       Version    Part number     Serial number      Description
Chassis                                               BH0207452124       EX3200-24T
FPC 0                      REV X3     750-021261      BH0207452124       EX3200-24T, 8 POE
CPU                                   BUILTIN         BUILTIN            FPC CPU
PIC 0                                 BUILTIN         BUILTIN            24x 10/100/1000 Base-T
PIC 1                      REV X1     711-021270      AR0207421473       4x GE SFP
Power Supply 0             REV 01     740-020957      AT0507430139       PS 320W AC
Fan Tray           

Use the show poe controller command to view PoE power usage and availability details:
lab@ex4> show poe controller

Controller  Maximum   Power           Guard-band  Management
Index       Power     Consumption
0           130 W     7W               0W         Static

Display the PoE status for all PoE interfaces:

To display the real-time PoE status for all PoE interfaces, enter the show poe interface command, which is used to verify the operational state of PoE interfaces. This command also displays the power consumption details for powered devices attached to the PoE interfaces. 

lab@ex4> show poe interface
Interface Admin-Status Oper-Status Max-Power Priority Power-Consumption Class
 ge-0/0/0 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/1 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/2 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/3 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/4 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/5 Enabled      OFF         15.4W     Low      0.0W                0
 ge-0/0/6 Enabled       ON         15.4W     Low      7.4W                3
 ge-0/0/7 Enabled       ON         15.4W     Low      0.1W                0

Display the PoE status for individual interface using the show poe interface <interface-name> command :

lab@ex> show poe interface ge-0/0/6   
PoE interface status:
PoE interface                :  ge-0/0/6 
Admin status                 : Enabled     
Operational status           :   ON    
Power limit on the interface : 15.4W       
Priority                     :  Low      
Power consumed               : 4.3W               
Class of power device        :   3


To monitor the PoE interface power consumption over a period of time, you can enable telemetries on the interface using the telemetries configuration statement. When Telemetries is enabled, you can display the log of the interface's power consumption by using the CLI command "show poe telemetries interface <interface-name> <entries>".
user@switch> show poe telemetries interface ge-0/0/0 10

Sl No    Timestamp                Power    Voltage
   1     01-27-2008 18:19:58 UTC  15.4W     51.6V
   2     01-27-2008 18:18:58 UTC  15.4W     51.6V
   3     01-27-2008 18:17:58 UTC  15.4W     51.6V
   4     01-27-2008 18:16:58 UTC  15.4W     51.6V
   5     01-27-2008 18:15:58 UTC  15.4W     51.6V
   6     01-27-2008 18:14:58 UTC  15.4W     51.6V
   7     01-27-2008 18:13:58 UTC  15.4W     51.6V
   8     01-27-2008 18:12:57 UTC  15.4W     51.6V
   9     01-27-2008 18:11:57 UTC  15.4W     51.6V
  10     01-27-2008 18:10:57 UTC  15.4W     51.6V

Output Fields:

  1. S1 No - Number of the record for the specified port. Record number 1 is the most recent.
  2. Timestamp - Time that the power-consumption data was gathered.
  3. Power - Amount of power provided by the specified port at the time the data was gathered.
  4. Voltage - Maximum voltage provided by the specified port at the time the data was gathered.
Modification History:
2020-08-10: Added KB31533​ as related link.

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