Bug ID 1959765: The gearbox may occasionally drop traffic under high load

Last Modified: Feb 13, 2026

Affected Product(s):
F5OS Velos(all modules)

Known Affected Versions:
F5OS-A 1.8.0, F5OS-A 1.8.1, F5OS-A 1.8.2, F5OS-A 1.8.3

Opened: May 27, 2025

Severity: 3-Major

Symptoms

Dropped packets in Gearbox. (tmctl -d blade gbx_stat)

Impact

Dropped packets.

Conditions

- F5 r5000, r10000, or r12000-series appliance - When the front panel ports are not 100G - Low numbers of UP ports - High traffic rates

Workaround

Use 100g ports. Add more LAG members.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips