Bug ID 1042253: System controller upgrade from F5OS-C 1.2.0-10357 to 1.2.1-10301 intermittently fails

Last Modified: Dec 07, 2023

Affected Product(s):
F5OS Install/Upgrade(all modules)

Fixed In:
F5OS-C 1.3.0, F5OS-C 1.2.1

Opened: Aug 23, 2021

Severity: 2-Critical


The upgrade proceeds to the point where both system controllers boot to the new image, but neither system controller becomes active.


Neither system controller becomes active, and the ability to configure the system controllers is compromised.


When this issue is observed, the output of the "show full-configuration system redundancy config mode" command is something other than the default (auto).


Restarting both Vcc-ConfD containers (or a reboot of both system controllers) should clear the problem.

Fix Information

Intermittent loss of active system controller when upgrading from F5OS-C 1.2.0-10357 to 1.2.1-10301 is now fixed in F5OS-C 1.2.1.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips