Bug ID 697615: Neurond may restart indefinitely after boot, with neurond_i2c_config message

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:

Fixed In:
14.0.0, 13.1.1

Opened: Dec 05, 2017
Severity: 1-Blocking
Related AskF5 Article:


The neurond daemon may continually restart after a reboot. The problem may persist even after a reboot of the BIG-IP system. Manually stopping and starting neurond will not resolve the problem.


The BIG-IP system constantly logs messages similar to the following: emerg logger: Re-starting neurond The /var/log/neurond logfile contains messages similar to the following: -- neurond_i2c_config_steps: STEP 20 Checking for Lane Alignment -- neurond_i2c_config_steps: Timeout waiting for good rx_align for ILK1 of NSP -- neurond_i2c_config: neurond_i2c_config_steps failed.


- This occurs only on BIG-IP platforms that contain a specific hardware part running v13.1.0. - The issue happens only after a reboot of the BIG-IP system.


If you are not using FIX features, disabling the neurond service is a safe option. If your configuration relies on the FIX feature, a cold reboot by removing the BIG-IP system from the power may resolve the problem. However, multiple retries are sometimes necessary to get the part to initialize.

Fix Information

This release increases the number of initialization retries to handle this condition, so continual restarts no longer occur.

Behavior Change