Bug ID 635129: Chassis systems in HA configuration become Active/Active during upgrade

Last Modified: Nov 22, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP Install/Upgrade, TMOS, vCMP(all modules)

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2

Fixed In:
13.0.0, 12.1.2 HF1

Opened: Dec 20, 2016
Severity: 3-Major
Related AskF5 Article:


When devices in a Device Service Cluster are upgraded, multiple devices will become Active simultaneously. The affected versions erroneously clear their management-ip during reboot and synchronize this to other members of the Device Service Cluster. If the system is not performing an upgrade, the error is repaired as the device starts up, and has no visible effect. If an upgrade is being performed, the management-ip cannot be repaired, and the Device Service Cluster members lose contact with each other, and all become Active.


When multiple devices become Active simultaneously, traffic is disrupted.


This problem occurs on VIPRION chassis systems, either running natively, or as a VCMP guest, when upgrading from the affected versions (12.1.0, 12.1.1, 12.1.2), to any other version. The problem occurs on any upgrade, whether on the list of affected versions, or a later version.


There is no workaround other than to remain in Active/Active state until all Chassis are finished upgrade. See https://support.f5.com/csp/article/K43990943 for more information on how to mitigate this issue.

Fix Information

The erroneous management-ip change is not made, and the HA failover mechanism operates correctly across upgrade.

Behavior Change