Bug ID 1826185: Tenants on r2000 and r4000 series may drop packets larger than 9194 bytes

Last Modified: Jul 03, 2025

Affected Product(s):
BIG-IP F5OS-A, LTM(all modules)

Known Affected Versions:
15.1.10.6, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1

Opened: Mar 03, 2025

Severity: 3-Major

Symptoms

F5OS tenants have a supported maximum MTU of 9198 bytes as per K6399. Tenants running on 2000 and r4000 series may drop packets larger than 9194 bytes. The tmm/xnet/iavf/per_vf_stats.rx_discards stat increments when this occurrs.

Impact

Dropped jumbo frames

Conditions

R2000 or r4000 platform. Jumbo frames

Workaround

Lower the MTU such that packets are not exceeding 9194 bytes.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips