Field Notice: FN - 72209 - ISR C1161 Units Experience Silent Reloads - BIOS/Firmware Upgrade Recommended

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Updated:June 25, 2021

Document ID:FN72209

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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	25-Jun-21	Initial Release

Products Affected

Affected Product ID	Comments
C1161-8P
C1161-8P++
C1161-8PLTEP++	Part Alternate
C1161-8PLTEP	Part Alternate
C1161X-8P
C1161X-8P++

Defect Information

Defect ID	Headline
CSCvx30142	ISR1161/ISR1161X might reload silently with last reload reason: PowerOn
CSCvx60093	[ES] C1161 MCU upgrade to fix unexpected reloads issue
CSCvx54917	C1161 Reloads unexpectedly with no crash files

Problem Description

A limited number of Cisco Integrated Services Router (ISR) C1161 units might experience silent reloads. This could cause the Cisco IOS^® software to spontaneously return to ROM Monitor (ROMMON) state and reboot. A single power-on reload might not be a symptom of this issue. Several reloads is a common symptom of this issue.

Background

Firmware in the on-board power monitor microcontroller senses that a power rail violates a voltage specification, which causes the system to power-cycle. The voltage is NOT actually out of its specified range. Manufacturing variability among the components can lead to a situation where the firmware in the power monitor microcontroller can incorrectly flag a valid power rail voltage as faulty.

This issue only affects a limited number of Cisco ISR C1161 products and will typically show within two or three days of installation.

Problem Symptom

The Cisco IOS software spontaneously returns to the ROMMON state and reboots. Several reloads is a common symptom of this issue.

Workaround/Solution

Customers must follow these steps in order to address this issue. Check the Version Identifier (VID) of the router to determine if it needs to be updated. Routers with a VID of V02 or higher are not susceptible and DO NOT need to be updated.

Verify the router’s VID and deviation.

If the Version ID is V01 and the deviation number is 0, contact the Cisco Technical Assistance Center (TAC) in order to request the appropriate loader image. Reference FN72209 and silent reloads when you open the ticket.

VID	Deviation	Action
V01	0	Apply the workaround if you experience issues
V01	561791	No action required
V01	561625	No action required
V02 or higher	N/A	No action required

How To Identify Affected Products

In order to find the router's VID and deviation number, enter this CLI command.

Router#show diag all eeprom detail

MIDPLANE EEPROM data:


               EEPROM version           : 4

               Compatible Type          : 0xFF

               Chassis MAC Address      : b0c5.3c87.ed00

               PCB Serial Number        : FOC24474XF3

               Controller Type          : 4241

               Hardware Revision        : 1.0

               Processor type           : DD

               PCB Part Number          : 74-121190-01

               Board Revision           : B0

               Deviation Number         : 0

               Fab Version              : 01

               RMA Number               : 0-0-0-0

               RMA History              : 00

               MAC Address block size   : 128

               Chassis Serial Number    : FGL2512L18T

               Product Identifier (PID) : C1161X-8PLTEP

               Version Identifier (VID) : V01

               Top Assy. Part Number    : 800-48838-01

               CLEI Code                : INMCA00ARA

               Asset ID                 : 00000

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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