Bug ID 843597: Ensure the system does not set the VE's MTU higher than the vmxnet3 driver can handle

Last Modified: Nov 12, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP All(all modules)

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 15.0.0, 15.0.1

Opened: Oct 28, 2019
Severity: 3-Major

Symptoms

The vmxnet3 driver cannot handle MTUs larger than 9000 bytes.

Impact

Either packets are dropped, or the hypervisor may crash on some platforms that do not handle this condition gracefully.

Conditions

-- Using a BIG-IP Virtual Edition (VE) with the vmxnet3 driver. -- Passing packets larger than 9000 bytes.

Workaround

Modify the tmm_init.tcl file, adding the following line: ndal mtu 9000 15ad:07b0

Fix Information

None

Behavior Change