Last Modified: Feb 03, 2026
Affected Product(s):
BIG-IP Install/Upgrade, TMOS
Known Affected Versions:
17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 21.0.0, 21.0.0.1
Opened: Jan 21, 2026 Severity: 2-Critical
After upgrading BIG-IP software on a VIPRION system, the device may fail to load the configuration and enter an INOPERATIVE state. The system remains stuck during the configuration load phase, preventing normal operation.
The VIPRION cluster becomes INOPERATIVE and is unable to load the configuration. Traffic is impacted as the system cannot process or pass traffic until the issue is resolved.
1. VIPRION platform with clustered configuration. 2. Performing a BIG-IP software upgrade. 3. System attempts to load post-upgrade configuration during boot or blade role transition
Restarting the system with a different blade set as primary, or reverting to the previously working software version, allows the configuration to load successfully. In some cases, re-attempting the upgrade after correcting the blade role transition also resolves the issue.
None