Bug ID 1858657: Inconsistency with receiver power low alarms on portgroups 3/1 and 3/2 despite ports 3/1.4 and 3/2.4 being in the exact same state

Last Modified: Jul 12, 2025

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

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

Opened: Mar 20, 2025

Severity: 3-Major

Symptoms

Both portgroup 3/1 and 3/2 have state ddm rx-pwr instant val-lane4 = -40.0, but only one reports an alarm. There also seems to be a discrepancy regarding the alarms and the logs The alarm log from velos.log reports an error from Portgroup 3/1: 2025-02-12T09:10:19.573179+00:00 T-WDC-PR-SERLB-205.oobmgnt.global.tesco.org fpgamgr[13]: nodename=blade-3(p3) priority="Warn" version=1.0 msgid=0x304000000000012 msg="DDM low warning set" PORTGROUP="3/1" ALARMTYPE="receive power" LANE1=-0.029600 LANE2=-0.008900 LANE3=-0.046900 LANE4=-0.400000. But the alarm is reported for Portgroup 3/2: # show system alarms ID RESOURCE SEVERITY TEXT TIME CREATED ------------------------------------------------------------------------------------------------------- 262401 Portgroup 3/2 ERROR Lanes: 4 Receiver power low alarm 2025-02-12 09:10:19.603552427 UTC

Impact

Alarm reported for only one of the Portgroups when both Portgroups have low rx-power values.

Conditions

Both interfaces 3/1.4 and 3/2.4 enabled, but disconnected (no cables inserted).

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips