Last Modified: Jun 07, 2025
Affected Product(s):
F5OS F5OS-C
Fixed In:
F5OS-C 1.8.0
Opened: Oct 11, 2024 Severity: 3-Major
If the active management port link is cycled down and up, a system controller and partition HA failover will occur. When the system controller failover occurs, a slot state change event is generated causing switchd to "link bounce" all data plane ports even though the slot state on those ports has not changed. Any act performed on the chassis that would cause a slot state change event will trigger this behavior. That includes inserting or removing a blade. The impact of the link bounce can be observed by 'IMM watchdog events' reported in the partitions velos.log (/var/F5/partition<id>/velos.log: fpgamgr[14]: nodename=controller-1(p4) nodename=blade-3(p4) priority="Warn" version=1.0 msgid=0x305000000000008 msg="VQF IMM Watchdog." slot=5 port=9.
The data plane links are bounced (brought down and immediately back up), this will trigger the VQF IMM watchdogs.
This occurs when the active system controller management link is marked down, resulting in an HA switchover or any other act performed on the chassis that can lead to a slot state change event (ie removing/inserting a blade).
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