Bug ID 2048033: FCS or FEC uncorrected errors seen continuously on the system

Last Modified: Dec 20, 2025

Affected Product(s):
F5OS F5OS-C(all modules)

Known Affected Versions:
F5OS-C 1.8.0, F5OS-C 1.8.1, F5OS-C 1.8.2

Opened: Sep 08, 2025

Severity: 2-Critical

Symptoms

FCS (Frame Check Sequence) and FEC (Forward Error Correction) error statistics for chassis/blade backplane ports were incorrectly reported as unhealthy because the system interpreted raw (non-zero) counter values as errors.

Impact

System will display switch port status alarms and events.

Conditions

Occurs when switch reports FCS or FEC errors greater than 0

Workaround

None.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips