Here describes Cisco WLC 5520 AP upgrade process and system upgrades in HA mode.
Upload upgrade image
Upload via FTP mirror to the WLC
View Mirror uploaded successfully
(Cisco Controller) >show boot
Primary Boot Image............................... 8.5.151.0 (default)
Backup Boot Image................................ 8.5.140.0 (active)AP View currently running version
(Cisco Controller) >show ap image all
Total number of APs.............................. 69
Number of APs
Initiated....................................... 0
Downloading..................................... 0
Predownloading.................................. 0
Completed predownloading........................ 0
Not Supported................................... 0
Failed to Predownload........................... 0
Predownload Predownload Flexconnect
AP Name Primary Image Backup Image Status Version Next Retry Time Retry Count Predownload
------------------ -------------- -------------- --------------- -------------- ---------------- ------------ --------------
pekidg-ap31-301 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap22-608 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap29-302 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap04-N135 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap10-302 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap18-S062 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap12-301 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap02-707 8.5.140.0 8.2.166.0 None None NA NA
pekidg-ap30-301 8.5.140.0 8.2.166.0 None None NA NA
Pushing a new image to the AP
(Cisco Controller) >config ap image predownload primary allView the push process
(Cisco Controller) >show ap image all
Total number of APs.............................. 69
Number of APs
Initiated....................................... 0
Downloading..................................... 0
Predownloading.................................. 69
Completed predownloading........................ 0
Not Supported................................... 0
Failed to Predownload........................... 0
Predownload Predownload Flexconnect
AP Name Primary Image Backup Image Status Version Next Retry Time Retry Count Predownload
------------------ -------------- -------------- --------------- -------------- ---------------- ------------ --------------
pekidg-ap31-301 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap22-608 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap29-302 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap04-N135 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap10-302 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap18-S062 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap12-301 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap02-707 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap30-301 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
pekidg-ap20-S038 8.5.140.0 8.2.166.0 Predownloading 8.5.151.0 NA 0
Push success
(Cisco Controller) >show ap image all
Total number of APs.............................. 69
Number of APs
Initiated....................................... 0
Downloading..................................... 0
Predownloading.................................. 1
Completed predownloading........................ 68
Not Supported................................... 0
Failed to Predownload........................... 0
Predownload Predownload Flexconnect
AP Name Primary Image Backup Image Status Version Next Retry Time Retry Count Predownload
------------------ -------------- -------------- --------------- -------------- ---------------- ------------ --------------
pekidg-ap31-301 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap22-608 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap29-302 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap04-N135 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap10-302 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap18-S062 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap12-301 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap02-707 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap30-301 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NA
pekidg-ap20-S038 8.5.140.0 8.5.151.0 Complete 8.5.151.0 NA NANormal state confirmation WLC HA
(Cisco Controller) >show redundancy summary
Redundancy Mode = SSO ENABLED
Local State = ACTIVE
Peer State = STANDBY HOT
Unit = Primary
Unit ID = 28:AC:9E:DF:93:D1
Redundancy State = SSO
Mobility MAC = 28:AC:9E:DF:93:D1
Redundancy Port = UP
BulkSync Status = Complete
Average Redundancy Peer Reachability Latency = 102 Micro Seconds
Average Management Gateway Reachability Latency = 863 Micro SecondsRestart WLC
After you configure 00:01:10 restart, time is too short error
(Cisco Controller) >reset system both in 00:01:10 image swap reset-aps save-config
Time period is too short.After the recommended configuration 00:02:01 reboot, bothit represents restart two WLC. (Likely after the restart AP has been upgraded to a new image, but still WLC or the previous image, this time to knock the following command to reboot the WLC.)
(Cisco Controller) >reset system both in 00:02:01 image swap reset-aps save-config
System reset is scheduled for Nov 07 00:00:14 2019.
Current local time and date is Nov 06 23:58:13 2019.
Trap will not be generated as total delay is less than the trap time.
Active boot image will be changed before the reset.
Use 'reset system cancel' to cancel the reset.
The system has unsaved changes.
Configuration will be saved before the system reset.Personal blog: https://cswk.work