Last Modified: Jul 15, 2026
Affected Product(s):
F5OS F5OS, F5OS-A, F5OS-C
Known Affected Versions:
F5OS-C 1.8.2
Fixed In:
F5OS v2.0.0
Opened: Apr 02, 2026 Severity: 3-Major
On an F5OS tenant, there may be packet loss when vlan-groups are in use. This occurs due to high churn inside the FDB table due to MAC addresses being learned between different host ports resulting in temporary DLF drops while the MAC is learned on the new port.
Packet loss. Failing monitor probes.
- BX520 blade - VLAN groups - A large amount of unique MAC addresses in the FDB table
Monitor probe issues may be alleviated by creating a static FDB entry for the local admin bit flipped MAC address that TMM is egressing packets from.
Enable service-DAG when learning host generated MAC addresses to eliminate port-motion events between host ports.