Bug ID 445911: TMM fast forwarded flows are offloaded to ePVA

Last Modified: Oct 16, 2023

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

Known Affected Versions:
11.5.1 HF1, 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, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2, 11.4.1 HF6

Opened: Jan 23, 2014

Severity: 2-Critical

Related Article: K15773

Symptoms

TMM fast forwarded flows are offloaded to ePVA, which is incorrect behavior. The symptom various depending on the FastL4 profile's PVA acceleration setting. If PVA acceleration is set to full, then the connection is established and handled by software (TMM). It is not offloaded to the ePVA. If PVA acceleration is set to guaranteed, then the connection will be reset.

Impact

TMM fast forwarded flows are offloaded to ePVA, which is incorrect behavior.

Conditions

This occurs when a virtual is configured with a FastL4 profile using HW acceleration (ePVA).

Workaround

For versions 11.3.x and 11.4.0, there is no workaround. On version 11.4.1 or later, you can use the following command to turn off tmm fast forward when using the guaranteed hardware acceleration mode: 'tmsh modify sys db tmm.ffwd.enable value false'.

Fix Information

TMM fast forwarded flows are no longer offloaded to ePVA, which is correct behavior.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips