Bug ID 518304: Provide Firmware and software EPVA FIX to support flow hash collision avoidance.

Last Modified: Oct 16, 2023

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

Known Affected Versions:
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, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.1.0

Opened: Apr 15, 2015

Severity: 2-Critical

Symptoms

Provide firmware and software EPVA FIX to support flow hash collision avoiding.

Impact

Flow hash collisions.

Conditions

Offloading FIX connections to EPVA, which includes the following platforms: 10000, 10050, 10055, 10200, 10350, and 12050.

Workaround

None.

Fix Information

New FPGA firmware and BIG-IP software have been designed to avoid and to predict the FIX flow hash collision. This provides extremely low rate of collision even at very high load in ePVA. A DB variable is used to configure a standard FPGA firmware or this enhanced FPGA firmware. BIG-IP automatically adapts its new function when the new FPGA firmware is loaded.

Behavior Change

New FPGA firmware and BIG-IP software have been designed to avoid and to predict the FIX flow hash collision. This provides extremely low rate of collision even at very high load in ePVA. A DB variable is used to configure a standard FPGA firmware or this enhanced FPGA firmware. BIG-IP automatically adapts its new function when the new FPGA firmware is loaded. The DB variable is relevant only for LTM.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips