Hello i need to upgrade some Cisco 5508 WLCs (HA SSO) from SW 8.0 to 8.5
normaly i would: FUS Upgrade, Upgrade from 8.0 --> 8.3 - wait till everything is working again --> Upgrade from 8.3 --> 8.5
but this brings a huge downtime.
so my question is, if it would be possible to:
1 .break HA
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config all AP for WLC-1
-
upgrade WLC-2
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then config all aps for the upgraded WLC-2 - APs will donwload SW
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upgrade the WLC-1
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establish HA SSO between WLC-1 & WLC-2
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Done
this would reduce the Downtime.
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