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Monitoring and Troubleshooting PoE
Monitoring PoE Power Consumption (CLI Procedure)
You can monitor Power over Ethernet (PoE) power consumption, both for the switch as a whole and for individual PoE interfaces.
This topic describes how to monitor:
- PoE Power Consumption on a Switch
- Current Power Consumption for PoE Interfaces
- Power Consumption for PoE Interfaces over Time
PoE Power Consumption on a Switch
Purpose
Determine the current PoE power consumption on a switch.
Action
Enter the following command:
user@switch> show poe controller Controller Maximum Power Guard Management Status Lldp index power consumption band Priority 0 405.00W 130.00W 0W Class AT_MODE Disabled
Meaning
At the time the command was executed, the PoE interfaces on the switch were consuming 130 W out of the PoE power budget of 405 W.
Current Power Consumption for PoE Interfaces
Purpose
Determine the current power consumption for individual PoE interfaces.
Action
To monitor the power consumption of all PoE interfaces on the switch, use the following command:
user@switch> show poe interface
Interface Admin Oper Max Priority Power Class
status status power consumption
ge-0/0/0 Enabled ON 15.4W Low 7.4W 0
ge-0/0/1 Enabled ON 15.4W High 12.0W 0
ge-0/0/2 Enabled ON 15.4W Low 12.4W 0
ge-0/0/3 Enabled ON 7.0W Low 5.3W 2
ge-0/0/4 Enabled ON 4.0W Low 4.0W 1
ge-0/0/5 Enabled ON 7.0W Low 6.1W 2
ge-0/0/6 Enabled ON 15.4W Low 12.3W 3
ge-0/0/7 Disabled Disabled 0.0W Low 0.0W not-
applicableTo monitor the power consumption of the PoE interfaces on a specific EX6200 or EX8200 line card, use the following command:
user@switch> show poe interface fpc-slot 3
Interface Admin Oper Max Priority Power Class
status status power consumption
ge-3/0/0 Enabled ON 30.0W Low 20.3W 4
ge-3/0/1 Enabled ON 30.0W Low 17.8W 4
ge-3/0/2 Enabled ON 30.0W High 16.3W 4
ge-3/0/3 Enabled ON 30.0W High 16.2W 4
ge-3/0/4 Enabled ON 30.0W Low 25.9W 4
ge-3/0/5 Enabled ON 30.0W Low 10.1W 4
ge-3/0/6 Enabled ON 30.0W Low 16.2W 4
ge-3/0/7 Enabled ON 30.0W Low 6.4W 4
ge-3/0/8 Enabled ON 30.0W Low 5.2W 4
ge-3/0/9 Enabled ON 30.0W Low 5.2W 4
ge-3/0/10 Enabled ON 30.0W Low 21.5W 4
ge-3/0/11 Enabled ON 30.0W Low 21.7W 4
ge-3/0/12 Enabled ON 15.4W Low 9.4W 0
ge-3/0/13 Enabled ON 15.4W Low 9.4W 0
ge-3/0/14 Enabled ON 15.4W Low 9.4W 0
ge-3/0/15 Enabled ON 15.4W Low 9.4W 0
ge-3/0/16 Enabled ON 15.4W Low 9.4W 0
ge-3/0/17 Enabled ON 15.4W Low 9.4W 0
ge-3/0/18 Enabled ON 15.4W Low 9.4W 0
ge-3/0/19 Enabled ON 15.4W Low 9.4W 0
ge-3/0/20 Enabled ON 15.4W Low 9.4W 0
ge-3/0/21 Enabled ON 15.4W Low 9.4W 0
ge-3/0/22 Enabled ON 15.4W Low 9.4W 0
ge-3/0/23 Enabled ON 15.4W Low 9.4W 0
ge-3/0/24 Enabled ON 15.4W Low 9.4W 0
ge-3/0/25 Enabled ON 15.4W Low 9.4W 0
ge-3/0/26 Enabled ON 15.4W Low 9.4W 0
ge-3/0/27 Enabled ON 15.4W Low 9.4W 0
ge-3/0/28 Enabled ON 15.4W Low 7.0W 0
ge-3/0/29 Enabled ON 15.4W Low 2.2W 1
ge-3/0/30 Enabled ON 15.4W Low 2.2W 1
ge-3/0/31 Enabled ON 15.4W Low 2.2W 1
ge-3/0/32 Enabled ON 15.4W Low 2.0W 1
ge-3/0/33 Enabled ON 15.4W Low 2.0W 1
ge-3/0/34 Enabled ON 15.4W Low 2.2W 1
ge-3/0/35 Enabled ON 15.4W Low 2.2W 1
ge-3/0/36 Enabled ON 15.4W Low 2.2W 1
ge-3/0/37 Enabled ON 15.4W Low 2.2W 1
ge-3/0/38 Enabled ON 15.4W Low 2.2W 1
ge-3/0/39 Enabled ON 15.4W Low 2.2W 1To monitor the power consumption of an individual PoE interface (for example, ge-0/0/3), use the following command:
user@switch> show poe interface ge-0/0/3 PoE interface status: PoE interface : ge-0/0/3 Administrative status : Enabled Operational status : ON Power limit on the interface : 7.0W Priority : Low Power consumed : 5.3W Class of power device : 2 PoE Mode : 802.3at
Meaning
At the time the command was executed, the individual PoE ports were consuming the amount of power shown. For example, interface ge-0/0/3 was consuming 5.3 W at the time the command was executed.
Power Consumption for PoE Interfaces over Time
Purpose
Monitor the power consumption of a PoE interface over a period of time. The records collected remain available for future viewing.
You can specify the intervals at which power consumption data is collected, from once every minute to once every 30 minutes. The default is once every 5 minutes. You can also specify the duration over which the records are collected, from 1 hour (default) to 24 hours.
Action
To collect historical records of PoE interface power consumption and display those records:
Add the
telemetriesstatement to the PoE interface configuration:content_copy zoom_out_map[edit] user@switch# set poe interface ge-0/0/5 telemetries interval 10
When you commit the configuration, record collection begins.
Display the collected records:
content_copy zoom_out_mapuser@switch> show poe telemetries interface ge-0/0/5 count all Sl No Timestamp Power Voltage 1 03-19-2010 13:00:07 UTC 3.9W 50.9V 2 03-19-2010 12:50:07 UTC 3.9W 50.9V 3 03-19-2010 12:40:07 UTC 3.9W 50.9V 4 03-19-2010 12:30:07 UTC 3.9W 50.9V 5 03-19-2010 12:20:07 UTC 3.9W 50.9V 6 03-19-2010 12:10:07 UTC 3.9W 50.9V
To start another session of record collection on the interface, you must delete the existing telemetries configuration on the interface and then reconfigure telemetries. Deleting the telemetries configuration also clears the power consumption history data.
To clear the history of PoE power consumption without deleting the telemetries configuration, use the command clear poe telemetries interface.
Meaning
Over the hour in which the PoE power consumption data on ge-0/0/5 was collected, the connected powered device consistently consumed 3.9 W.
Troubleshooting PoE Interfaces
- Problem: No Power supply to powered device
- Problem: All powered devices going down after PSU hot swap
Problem: No Power supply to powered device
Problem Description
A Power over Ethernet (PoE) interface is not supplying power to the powered device.
Solution
Check for the items shown in Table 1.
| Items to Check | Explanation |
|---|---|
Is the switch a full PoE model or a partial PoE model? | If you are using a partial PoE model, only interfaces ge-0/0/0 through ge-0/0/7 can function as PoE ports. |
Has PoE capability been disabled for that interface? | Use the |
Is the cable properly seated in the port socket? | Check the hardware. |
Has the PoE power budget been exceeded for the switch? | Use the |
Does the powered device require more power than is available on the interface? | Use the |
If the telemetries option has been enabled for the interface, check the history of power consumption. | Use the |
Problem: All powered devices going down after PSU hot swap
Problem Description
When you are hot swapping a PSU, all the powered devices are going down.
If you are hot swapping (inserting a PSU and removing redundant PSU) within a period less than 25 secs, then you will observe all the power devices going down.
Solution
It is recommended to insert the redundant PSU, wait for at least 35 secs, and then remove the desired PSU.
