Bug ID 1611433: High controller CPU utilization spikes can impact internal chassis link status

Last Modified: Oct 19, 2025

Affected Product(s):
F5OS Velos(all modules)

Known Affected Versions:
F5OS-C 1.1.4, F5OS-C 1.2.1, F5OS-C 1.2.2, F5OS-C 1.3.1, F5OS-C 1.3.2, F5OS-C 1.5.0, F5OS-C 1.5.1, F5OS-C 1.6.0, F5OS-C 1.6.1, F5OS-C 1.6.2

Fixed In:
F5OS-C 1.6.4

Opened: Jul 09, 2024

Severity: 3-Major

Symptoms

The blade side team0 aggregation flaps. As a result, management and control plane traffic between chassis blade and controller intermittently drops.

Impact

Various impacts including: BIG-IP tenant traffic-group split-brain, unexpected BIG-IP tenant traffic-group failovers, and management connectivity loss.

Conditions

High CPU utilization spike across all controller cpu cores. Utilization generally greater than 100% can trigger link flapping.

Workaround

Rebooting controllers experiencing high CPU utilization will generally return CPU utilization to normal levels.

Fix Information

Internal chassis link status is less susceptible to high CPU utilization spikes.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips