Unable to reconfigure second wlc unit to work in SSO mode

[kshalavin]

Hi all.

I tried to switch on SSO mode on both wlc 5520.

If I enter SSO mode on the second node I got an error:

>config redundancy mode sso

WARNING: 1. If peer unit's management and/or redundancy management entries are present as mobility members please remove them before enabling redundancy.
All unsaved configuration will be saved.
And the system will be reset. Are you sure? (y/n)y

Controller must be booted with primary image to enable redundancy mode

Currently, my boot images on second node are (on primary node these images are vice versa):

>show boot                                                             
Primary Boot Image............................... 8.5.182.0                     
Backup Boot Image................................ 8.10.151.0 (default) (active)

So, what is the fastest way to fix it?

If I do boot from my primary partition I think, I got version mismatch, and no SSO at all.

Is it possible to copy image from one partition to other?

Or I need to use external server to upload the same image to primary partition?

Thanks.

[Sandeep Choudhary]

Hi,

1. First upgrade the Software on 2nd WLC to same version as Primary WLC.

2. Configure the redundancy Paramentes on both WLCs 

3. Reboot WLCs on same time.

More info: https://networkguy.de/cisco-wlc-high-availability/

Regards

Dont forget to arte helpful posts

[kshalavin]

HI, I have already the same firmware version.

But on first node it is placed on primary partition, and on secondary node - on secondary partition.

Now I will try to upload again the same firmware to primary partition. 

[Rich R]

No need to do that - just switch boot image and reboot.

https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107530-backup-image-wlc.html#anc7