Last Modified: May 06, 2025
Affected Product(s):
F5OS F5OS-C, Velos
Known Affected Versions:
F5OS-C 1.6.1, F5OS-C 1.6.2
Fixed In:
F5OS-C 1.8.0
Opened: Apr 05, 2024 Severity: 2-Critical Related Article:
K000139293
VELOS system controller and chassis partition software may incorrectly start allocating the same MAC addresses to different objects in chassis partitions. In the worst case, this can result in multiple tenants using the same MAC addresses on the same VLAN, resulting in traffic disruptions for those tenants. This issue occurs when the following conditions are met: You are running F5OS-C 1.6.x software on the F5 VELOS system controllers. The system controllers restarted simultaneously, such as during an out-of-service upgrade or power outage. The F5 VELOS system controllers then fail over.
Traffic disruption on tenants due to duplicated MAC address.
After this occurs, the VELOS system controller loses track of which MAC addresses have been allocated to chassis partitions, setting up a situation where creating new tenants or chassis partitions may re-use MAC addresses already allocated to objects on the system.
None
Once a system is affected, upgrading to a version or engineering hotfix (EHF) that contains the fix for ID1576241 does not resolve the issue; manual intervention is also required to fix the issue.