Field Notice: FN - 64161 - Nexus 6004 Switch Might Hang Due to PCIE Issue - Replace on Failure

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	30-Mar-17	Initial Release
10.0	19-Oct-17	Migration to new field notice system
11.0	11-Jul-18	Updated the Workaround/Solution Section
11.1	10-Jun-21	Updated the Workaround/Solution Section

Products Affected

Affected Product ID	Comments
N6K-C6004	-B0 and lower are affected
N6K-C6004-96Q	-A0 is affected
N6K-C6004-96Q	-A0 is affected
N6K-C6004-96Q=	-A0 is affected
N6K-C6004-96Q=	-A0 is affected
N6K-C6004=	-B0 and lower are affected

Defect Information

Defect ID	Headline
CSCun18933	Nexus 6004: Switch hang due to PCIe issue

Problem Description

The Nexus 6004 switch might hang with no response from the mgmt0 interface and console ports.

Background

There is an insufficient design margin in the PCIe circuitry of the Nexus N6K-C6004-96Q(=) and N6K-C6004(=) switches which over time might result in switch degradation and ultimately a failure state. The switch might also not respond on mgmt0 interface and console ports.

A switch reload might temporarily resolve the failure state, but will not resolve the underlying hardware (HW) issues.

This issue is seen in Nexus 6004 switches with Top Assembly Numbers (TANs) 68-4623-01, 68-4623-03, and 68-4148-01.

This issue does not affect Nexus 6001 switches.

Problem Symptom

These symptoms might be seen:

• The switch hangs with no response from the mgmt0 interface and console ports.
• All interfaces go into a faulty state.
• Switches that run NXOS version 7.0(3) and later will display syslog messages similar to this message in the logs:

  2016 Jun 4 19:59:15 esc-6004-A %USER-0-SYSTEM_MSG: 080: PCIe critical FAILURE DETECTED, contact Cisco TAC - pfm

Workaround/Solution

If you experience the symptoms described in the previous section, verify whether the switch is impacted per the Impacted Switches table and the instructions in the How to Identify Affected Products section. If the unit is impacted, request a Return Material Authorization (RMA) for Fix on Failure.

Impacted Switches

Product Number	Part Number (TAN)	Part Revision (TAN Revision)
N6K-C6004(=)	68-4148-01	-B0 and lower
N6K-C6004-96Q(=)	68-4623-01	-A0
N6K-C6004-96Q(=)	68-4623-03	-A0

 

Non-Impacted Switches

Product Number	Part Number (TAN)	Part Revision (TAN Revision)
N6K-C6004(=)	68-4148-01	-C0
N6K-C6004(=)	68-5296-01	-A0 and higher
N6K-C6004(=)	68-5296-02	-A0 and higher
N6K-C6004-96Q(=)	68-4623-03	-B0
N6K-C6004-96Q(=)	68-5377-01	-A0 and higher
N6K-C6004-96Q(=)	68-5377-02	-A0 and higher

How To Identify Affected Products

In order to view product information, enter this command:

esc-6004-A# show sprom backplane | egrep Product|Serial|Part|H/W
Product Number : N6K-C6004-96Q
Serial Number : FOC1711R0QG
Part Number : 68-4623-01
Part Revision : A0
H/W Version : 1.0
esc-6004-A#

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:

• Open a service request on Cisco.com
• By email
• By telephone

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