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Highlighted
Frequent Contributor I

Re: IPM and restricted mode on 802.3at Aruba APs

Update:

 

I have adjusted the IPM priorities as follows:

AP08 (config) # ipm
AP08 (ipm) #

ipm-power-reduction-step-prio ipm-step disable_usb priority 6
ipm-power-reduction-step-prio ipm-step disable_alt_eth priority 5
ipm-power-reduction-step-prio ipm-step radio_2ghz_chain_2x2 priority 4
ipm-power-reduction-step-prio ipm-step cpu_throttle_25 priority 3
ipm-power-reduction-step-prio ipm-step cpu_throttle_50 priority 2
ipm-power-reduction-step-prio ipm-step cpu_throttle_75 priority 1

 

After committing this changes the System Status LED on the AP-515 turned to Green and the Power Status reports that there are no more restrictions on the radios:

 

Power Status

------------

Item                       Value

----                       -----

Power Supply               : POE-AF

LLDP Power                 : Successfully negotiated at 13.0W

Current Operational State   : 2.4GHz radio: No restrictions, 5GHz radio: No restrictions

Eth0 HW POE status         : POE AF, LLDP power: 13.0W

 

What is interesting:

The System Status does not reflect that anything is disabled.

But eth1 and USB are disabled.

 

What is not clear to me regarding the "Tip of the Week" document:

 

The following options are available within the IPM config:

‘cpu_throttle_25’ Reduce CPU frequency to 25%

‘cpu_throttle_50’ Reduce CPU frequency to 50%

‘cpu_throttle_75’ Reduce CPU frequency to 75%

 

In terms of priority, the higher priority assigned to a setting would be a lower value. A priority value of ‘4’ would be applied before a priority value of ‘1’, etc. Additionally, on settings that apply to the same feature (CPU, radio chains, etc), they should be prioritized accordingly so that the lower-impact setting is applied before the higher impact setting.

 

So the correct priorities - in contrast to the documented example - should therefore be:

ipm-power-reduction-step-prio ipm-step cpu_throttle_75 priority 3
ipm-power-reduction-step-prio ipm-step cpu_throttle_50 priority 2
ipm-power-reduction-step-prio ipm-step cpu_throttle_25 priority 1

 

With regards

Manfred M.

 

 

Highlighted
Aruba

Re: IPM and restricted mode on 802.3at Aruba APs

Manfred,

Not trying to second-guess your comments, but how did you confirm that USB and E1 are disabled (by IPM)?

/Onno
Highlighted
Aruba

Re: IPM and restricted mode on 802.3at Aruba APs

Manfred,

Note that the highest priority IPM item (lowest prio number) is the one that is applied first. So in your case, the first thing that should happen is throttle the CPU to 75%.

Also, what's the status (color) of the system LED?

/Onno
Highlighted
Frequent Contributor I

Re: IPM and restricted mode on 802.3at Aruba APs

Hi!

Thank you for your Reply. That's an important point to me.

Setting the priority did not immediately show the results. Only the System LED turned to Green immediately.

 

The Power Status now is:

 

Power Status
------------
Item                        Value
----                        -----
Power Supply                : POE-AF
LLDP Power                  : Successfully negotiated at 13.0W
Current Operational State   : 1 ETH port disabled; USB power disabled; 2.4GHz radio: No restrictions, 5GHz radio: No restrictions, CPU at 25%
Eth0 HW POE status          : POE AF, LLDP power: 13.0W

 

I'm now a little bit confused about the priority value you set with the command because you are telling me the opposite compared to the statements of the "Tip of the Week" Article.

 

Tips of the Week article:

In terms of priority, the higher priority assigned to a setting would be a lower value. A priority value of ‘4’ would be applied before a priority value of ‘1’.

 

User Guide:
Setting a low-priority value for a power reduction step reduces the power level sooner than setting a highpriority value for a power reduction step.

Your statement:

Note that the highest priority IPM item (lowest prio number) is the one that is applied first. So in your case, the first thing that should happen is throttle the CPU to 75%.

 

The settings now are as follows:

ipm
 enable
 ipm-power-reduction-step-prio ipm-step cpu_throttle_75 priority 1
 ipm-power-reduction-step-prio ipm-step cpu_throttle_50 priority 2
 ipm-power-reduction-step-prio ipm-step cpu_throttle_25 priority 3
 ipm-power-reduction-step-prio ipm-step radio_2ghz_chain_2x2 priority 4
 ipm-power-reduction-step-prio ipm-step disable_alt_eth priority 5
 ipm-power-reduction-step-prio ipm-step disable_usb priority 6

 

With kind regards

Manfred

Highlighted
MVP Expert

Re: IPM and restricted mode on 802.3at Aruba APs

The tip of the week will be getting updated today to correct for that. I wrote that, was a transposition error. I will be correcting that and adding the content about the 555. 

 

And I agree, it's very confusing but apparently that is the best logic that is possible for the hardware.

 


Jerrod Howard
Distinguished Technologist, TME
Highlighted
Frequent Contributor I

Re: IPM and restricted mode on 802.3at Aruba APs

Hi Jerrod!

 

Thank you for the clarification in the updated "Tip of the week" article which now includes all needed information about IPM and PoE. Works now as designed in my installations.

 

Link to Tip of the Week article:
https://afp.arubanetworks.com/afp/images/b/b4/Tip_of_the_Week_3_-_6-22-18_-_Intelligent_Power_Management.pdf

 

PS:

Thank you for your Mesh Deep Dive Session @Atmosphere in Croatia - good to hear that almost all of your best practices are also already my best practices...

 

Manfred M.

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