Bug ID 479374: Setting appropriate TX driver settings for 40 GB interfaces.

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.6.0, 11.6.0 HF1

Fixed In:
12.0.0, 11.6.0 HF2, 11.5.2, 11.4.1 HF9

Opened: Sep 15, 2014
Severity: 2-Critical
Related AskF5 Article:


In rare cases, the VIPRION C4800 chassis might experience an inability to establish some connections due to losing packets in one direction while in transit between blades.


When the problem is due to this issue, one or more 5.x or 6.x interfaces show status as 'up' but the corresponding media as 'none'. Inability to establish some connections. The problem is consistent, depending on source and destination IP and port.


VIPRION C4800 chassis.



Fix Information

VIPRION C4800 backplane interfaces are now given proper settings to prevent unidirectional traffic issues.

Behavior Change