Bug ID 2141089: Multicast traffic can be dropped by Host DLF rate-limiter

Last Modified: Jul 15, 2026

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

Known Affected Versions:
F5OS-C 1.8.1, F5OS-C 1.8.2

Fixed In:
F5OS v2.0.0

Opened: Oct 29, 2025

Severity: 3-Major

Symptoms

Multicast traffic from a tenant can be dropped by the host DLF rate-limiter, causing traffic loss.

Impact

Loss of multicast traffic.

Conditions

Egress multicast traffic exceeding 2500 packets per second.

Workaround

Create a static FDB entry for the multicast MAC address.

Fix Information

We changed the behavior of the FPGA code to remove multicast packets that miss the L2 table from being classified as DLF.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips