Hello,
I'm planning an upgrade from 5.0.3.0 to 5.0.4.12 as a previous step before upgrading to 6.x, my network consists of 1 master and 3 local controllers with cpsec enabled, I'm not sure the steps I should follow to avoid a network outage in the upgrade, I mean:
Upgrading to 5.0.4.12 with cpsec will recreate new certificates for AP and local controllers from master ???, if yes, does it conduct to a network outage until all AP get their new certificate and establish a new GRE encrypted tunnel ???
If I upgrade only a local controller to 5.0.4.12 leaving the master to 5.0.3.0, the master-local could be established ???.
Could I upgrade only the master controller to 5.0.4.12 leaving the local controllers with 5.0.3.0 with cpsec enabled, then pass all AP GRE to master ??