Field Notice: FN - 64094 - Nexus 5596/UCS FI 6296 - System Fails to Boot After a Power Cycle - Workaround Provided

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Updated:July 26, 2018
Document ID:FN64094

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Publish Date Comments
1.0
13-Jan-16
Initial Release
10.0
09-Oct-17
Migration to new field notice system
10.1
26-Jul-18
Updated the Defect Information Section

Products Affected

Affected Product ID Comments
N5K-C5596T-FA
N5K-C5596UP
N5K-C5596UP-FA
UCS-FI-6296UP

Defect Information

Defect ID Headline
CSCun00720 UCS 6296 FI System fails to boot after a power cycle
CSCun66310 Nexus 5596: System fails to boot after a power cycle

Problem Description

Some Nexus 5596 and Unified Computing System Fabric Interconnect (UCS FI) 6296 systems fail to boot after a software upgrade, reload, or power cycle. This problem is rare in occurrence but has been seen in the field.

The failure signature is no console output and the status LED remains solid green.

The issue is only seen on N5K-C5596UP, N5K-C5596T, and UCS-FI-6296UP. This DOES NOT affect the Nexus 50x0, Nexus 5548, Nexus 5600 Series, UCS FI 6100 Series, or UCS FI 6248.

Background

There are two power controller devices in the system and each controller device controls four ASIC devices 0.9V power rails on board. It was found that the firmware on the two controllers have different soft-start compensation parameters.

In order to correct the issue a script needs to be run on the system to update the controller settings. This can be done in the field, but requires assistance from the Technical Assistance Center (TAC).

Problem Symptom

After a power cycle there is no console output and the status LED remains solid green.

Workaround/Solution

Refer to the "How to Identify Affected Products" section for instructions on how to view the version of an in-service product.

If the hardware shows the Updated Hardware Version or later, no action is required.

If the hardware shows the Impacted Hardware Version or earlier, please call TAC or your account team for further assistance. The controller configuration settings can be corrected in the field with TAC assistance.

How To Identify Affected Products

Enter this command in nxos mode and see the table in order to determine if the hardware is impacted:

5596(nxos)# show sprom sup | inc H/W
H/W Version : 1.0
5596(nxos)#
PID Impacted Hardware Versions Updated HW Versions (Not Impacted)
UCS-FI-6296UP 1.0 1.1
N5K-C5596UP 1.0 1.1
N5K-C5596T 1.1 1.2

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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