Last Modified: Oct 19, 2026
Affected Product(s):
F5OS F5OS-C
Known Affected Versions:
F5OS-C 1.8.2, F5OS-C 1.8.2-HR1, F5OS-C 1.8.2-HR2, F5OS-C 1.8.2-HR3
Opened: Jan 20, 2026 Severity: 2-Critical
When the redundancy mode is set to "prefer-1" or "prefer-2", replacing or reinstalling the preferred system controller can result in configuration loss.
The system configuration can be lost, resulting in service disruption.
A preferred redundancy mode is configured during controller maintenance or a software upgrade.
Use the "auto" redundancy mode for normal operation. Use "prefer-1" or "prefer-2" only temporarily under guidance from F5 Support, and restore "auto" mode before controller maintenance or software upgrades.
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