Last Modified: Jul 28, 2026
Affected Product(s):
F5OS F5OS-C
Fixed In:
F5OS-C 1.8.2-HR1, F5OS v2.0.0
Opened: Jan 28, 2026 Severity: 2-Critical
After a controller failover, or reboot of the active CC mode, Stale ARP entries may cause the tenant management IPs to not be accessible. GARP packets are sent, but there was a race between the management port on the new CC becoming active and the tenant orchestration layer sending the GARPs
The tenant management IP will become inaccessible until the ARP entries in the upstream switch times out, or the tenant generates outbound traffic on the management port that causes an update of the ARP table.
This can happen after reboot/power cycle of the active controller, or manual failover the system controllers.
None.
GARPs are now sent for a longer time after the controller failover to make sure they reach the upstream network device.