Field Notice: FN - 64241 - cBR-8-Potential Protect Line Card Reload Due to Memory Leak - Software Upgrade Recommended

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Updated:December 20, 2018

Document ID:FN64241

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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	21-Feb-17	Initial Release
10.0	18-Oct-17	Migration to new field notice system
10.1	20-Dec-18	Correct missing images

Products Affected

Affected OS Type	Affected Software Product	Affected Release	Affected Release Number	Comments
NON-IOS	IOSXE	3	3.18.0S

Defect Information

Defect ID	Headline
CSCva51691	Standby card cdman mem leak on "docsis cm chunk"

Problem Description

There is the potential for a cBR-8 protect line card reload due to a cdman (Cable Device Manager) memory leak.

Line cards are:

CBR-LC-4D31-16U30
CBR-LC-4D31-16U31
CBR-LC-8D30-16U30
CBR-LC-8D31-16U30
CBR-LC-8D31-16U31

Background

A cable modem intermittent connectivity issue (flapping) might lead to a cdman memory leak on the cBR-8 protect line card. This issue is specific to cBR-8 Cisco IOS XE Software Release 3.18.0S while there is a line card redundancy in place.

Problem Symptom

These repeated alarms are observed in the logs triggered by the cBR-8 protect line card:

> Jul 3 23:30:03.775 EDT: %IOSXE-3-PLATFORM: CLC0: cdman: CDMINFRA CDM_PT_MEMORY_TEST SANITY TEST FAILED

> Jul 3 23:31:03.775 EDT: %IOSXE-3-PLATFORM: CLC0: cdman: CDMINFRA CDM_PT_MEMORY_TEST SANITY TEST FAILED

> Jul 3 23:32:03.775 EDT: %IOSXE-3-PLATFORM: CLC0: cdman: CDMINFRA CDM_PT_MEMORY_TEST SANITY TEST FAILED

Workaround/Solution

Cisco recommends that customers upgrade to Cisco IOS XE 3.18.0SP or a later release which contains the fix. Refer to this table for more information:

cBR-8 Cisco IOS XE Release	Does Issue Exist?	Action
3.15.0S	No	None
3.16.0S	No	None
3.16.1S	No	None
3.17.0S	No	None
3.18.0S	Yes	Upgrade to 3.18.0SP or later release
3.18.0SP or later release	No	None

In order to avoid this issue in the interim, Cisco suggests to reload the protect line card if the alarm mentioned in the Problem Symptoms section is observed in the logs.

How to Upgrade Software

Refer to Upgrading the Cisco cBR-8 Router Firmware for instructions on how to upgrade the cBR-8 Cisco IOS XE Release.

Cisco IOS Versions Affected

This issue is specific to cBR-8 Cisco IOS XE release: 3.18.0S while there is a line card redundancy in place.

How to Identify the Cisco IOS XE Software Version

In order to determine the current software version that runs on the cBR-8 router, enter the sh version command as shown in this example:

How To Identify Affected Products

The hardware information can be determined as indicated in this picture:

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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