Last Modified: Jul 15, 2026
Affected Product(s):
F5OS F5OS-C
Known Affected Versions:
F5OS-C 1.6.2, F5OS-C 1.6.4, F5OS-C 1.8.0, F5OS-C 1.8.1, F5OS-C 1.8.2
Fixed In:
F5OS v2.0.0
Opened: Aug 18, 2025 Severity: 3-Major
If the lag-type of a cplagg_1.x interface is removed, System Controller/blade communications will stop working. System Controller ConfD configuration of cplagg interfaces is set up by the confd initialization XML. The configuration may be viewed but should never be modified. Modification of the CPLAGG interface configuration needs to be blocked.
Control plane communications may be lost to the blade reachable through the modified cplagg interface.
System Controllers are up and running, and the confd configuration is accessible to the user.
Restore the CPLAGG configuration that existed before the modification. Perform a staged reboot of the system controllers: reboot the standby controller, after the rebooted controller comes up, make it the active controller, and reboot the new standby controller.
Users are prevented from modifying the System Controller confd configuration of the CPLAGG interfaces.