Controller Based WLANs

How to enable the ap image preload on aruba controller?

Introduction : This article explains how to trigger the AP image preload on the controller to minimize the downtime during the controller upgrade.

 

Feature Notes : The AP image preload allows the Access points (AP) to download the new image from the controller where it is terminated before the controller actually starts running the new version, hence reduces the downtime for the controller upgrade.
We can allow all the APs terminated on the controller or custom list of AP groups or individual APs to preload the image.
If a new AP associates to the controller when the preload feature is active, based on the AP group or AP name if it appears in the preload list the AP will start preload its image.

 

Environment : This feature is only supported on the 3600, 7200 Series and M3 controllers and applies to controllers running OS version 6.3 or later.

 

Network Topology : Standalone Master, Master-local

 

Configuration Steps :

Steps to trigger the AP image preload:
 


1. The controller should be upgraded first and before reboot, we need to trigger the AP image preloading in the same partition where the controller is upgraded.



(Aruba7240) #show image version 
----------------------------------
Partition                : 0:0 (/dev/usb/flash1) **Default boot**
Software Version  : ArubaOS 6.3.1.3 (Digitally Signed - Production Build)
Build number        : 42233
Label                    : 42233
Built on                 : Tue Feb 11 12:31:53 PST 2014
----------------------------------
Partition                : 0:1 (/dev/usb/flash2)
Software Version  : ArubaOS 6.3.1.2 (Digitally Signed - Production Build)
Build number         : 41362
Label                     : 41362
Built on                  : Wed Dec 18 17:12:20 PST 2013




(Aruba7240) #show ap image-preload-status
 
AP Image Preload Parameters
---------------------------
Item    Value
----    -----
Status  Inactive



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

-To enable the AP image preload using the CLI, use the following command on the enable mode:
 
(Aruba7240) #ap image-preload activate ?
all-aps                 Activate image preload for all registered APs.
specific-aps          Activate image preload for specific APs as specified
                             by 'ap image-preload ap-group' and/or 'ap
                             image-preload ap-name'


 (Aruba7240) #ap image-preload activate all-aps partition 0



2. 
Once the controller is rebooted, the APs will reboot along with the controller and come up with less downtime as the image is already preloaded.
The ap image-preload will go to inactive state automatically after the controller reboots.
 
3.   For the controller’s next upgrade, again we need to upgrade the controller first and then need to trigger the AP image preload.

 
Note: The ap image preload must be inactive and should be triggered only after the controller image upgrade.

 

 

Verification : The same can be verified using the following commands:


(Aruba7240) #show ap image-preload-status
 
AP Image Preload Parameters
---------------------------
Item                            Value
----                                -----
Status                          Active
Mode                           All APs
Partition                      1
Build                             41362
Max Simultaneous     Downloads  10
Start Time                   2014-03-18 12:05:04
 
AP Image Preload AP Status Summary
----------------------------------
AP Image Preload State  Count
----------------------  -----
Preloaded               1
TOTAL                      1
 
AP Image Preload AP Status
--------------------------
AP Name   AP Group  AP IP         AP Type  Preload State  Start Time           End Time             Failure Count  Failure Reason
-------   --------  -----         -------  -------------  ----------           --------             -------------  --------------
MasterAP  Master    10.10.10.252  105      Preloaded      2014-03-18 12:05:04  2014-03-18 12:06:15  0 


 
(Aruba7240) #show ap image-preload-status-summary
 
AP Image Preload Parameters
---------------------------
Item                             Value
----                                 -----
Status                           Active
Mode                            All APs
Partition                       1
Build                              41362
Max Simultaneous      Downloads  10
Start Time                    2014-03-18 12:05:04
 
AP Image Preload AP Status Summary
----------------------------------
AP Image Preload State  Count
----------------------  -----
Preloaded               1
TOTAL                      1




(Aruba7240) #show ap image version
 
AP Image Versions On Controller 
------------------------------- 
6.3.1.2(p4build@corsica.arubanetworks.com)#41362 Wed Dec 18 16:16:17 PST 2013
 
Access Points Image Version
---------------------------
AP            Running Image Version String                                                   Flash (Production) Image Version String                         Flash (Provisioning/Backup) Image Version String                    Matches  Num Matches  Num Mismatches  Bad Checksums  Bad Provisioning Checksums  Image Load Status
--            ----------------------------                                                   ---------------------------------------                         ------------------------------------------------                    -------  -----------  --------------  -------------  --------------------------  -----------------
10.10.10.252  6.3.1.2(p4build@corsica.arubanetworks.com)#41362 Wed Dec 18 16:16:17 PST 2013  6.3.1.3(p4build@port-royal)#42233 Tue Feb 11 11:29:58 PST 2014  6.1.3.4-3.1.0.0(p4build@cyprus)#35320 Sat Sep 15 13:43:44 PDT 2012  Yes      1            0               0              0                           Done
Total APs:1

 

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‎07-04-2014 03:00 AM
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