Software upgrade Cisco Wireless LAN Controller

Start by transfering new code to the Wireless LAN Controller. Initiate predownloading by doing the following. Basically you’re setting the new SW as backup, and telling the APs to download the new SW, before setting the backup SW as primary.

(Cisco Controller) >
(Cisco Controller) >show ap image all

Total number of APs.............................. 85
Number of APs
        Initiated....................................... 0
        Downloading..................................... 0
        Predownloading.................................. 0
        Completed predownloading........................ 85
        Not Supported................................... 0
        Failed to Predownload........................... 0

                                                 Predownload     Predownload                                  Flexconnect
AP Name            Primary Image  Backup Image   Status          Version        Next Retry Time  Retry Count  Predownload
------------------ -------------- -------------- --------------- -------------- ---------------- ------------ ---------
AP-22    8.2.121.0      8.5.131.0      Complete        8.5.131.0      NA               NA          
AP-23    8.2.121.0      8.5.131.0      Complete        8.5.131.0      NA               NA          
[...]

(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >show boot 
Primary Boot Image............................... 8.5.131.0
Backup Boot Image................................ 8.2.121.0 (default) (active)

(Cisco Controller) >config boot primary 


(Cisco Controller) >show boot
Primary Boot Image............................... 8.5.131.0 (default)
Backup Boot Image................................ 8.2.121.0 (active)

(Cisco Controller) >config ap image swap all 


(Cisco Controller) >show ap image all

Total number of APs.............................. 85
Number of APs
        Initiated....................................... 0
        Downloading..................................... 0
        Predownloading.................................. 0
        Completed predownloading........................ 85
        Not Supported................................... 0
        Failed to Predownload........................... 0

                                                 Predownload     Predownload                                  Flexconnect
AP Name            Primary Image  Backup Image   Status          Version        Next Retry Time  Retry Count  Predownload
------------------ -------------- -------------- --------------- -------------- ---------------- ------------ ---------
AP-22    8.5.131.0      8.2.121.0      Complete        8.5.131.0      NA               NA          
AP-23    8.5.131.0      8.2.121.0      Complete        8.5.131.0      NA               NA          
[...]

(Cisco Controller) >save config 

Are you sure you want to save? (y/n) y


Configuration Saved!

(Cisco Controller) >reset system in 00:10:00 image no-swap reset-aps 

System reset is scheduled for Jul 18 14:16:40 2018.
Current local time and date is Jul 18 14:06:40 2018.
A trap will be generated 10 minutes before each scheduled system reset.
Use 'reset system cancel' to cancel the reset.
Configuration will not be saved before the system reset.
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