Field Notice: FN - 70455 - Some Catalyst Switches That Run on Polaris Releases 16.9.1, 16.6.4, and 16.3.7 or Earlier Might Crash Unexpectedly - Software Upgrade Recommended

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Updated:November 6, 2019
Document ID:FN70455

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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
05-Nov-19
Initial Release

Products Affected

Affected OS Type Affected Software Product Affected Release Affected Release Number Comments
NON-IOS
IOSXE
16
16.3.1, 16.3.1a, 16.3.2, 16.3.3, 16.3.4, 16.3.5, 16.3.5b, 16.3.6, 16.3.7, 16.6.1, 16.6.1a, 16.6.2, 16.6.3, 16.6.4, 16.9.1, 16.9.1a, 16.9.1b, 16.9.1d

Defect Information

Defect ID Headline
CSCvm36748 Crash at expired "FED MAC AGING TIMER", "undefined" or "unknown" timer.

Problem Description

Some Catalyst switches that run on Polaris Releases 16.9.1, 16.6.4, and 16.3.7 or earlier might crash due to the Forwarding Engine Driver (FED) process. For example, C3850-48XS or C9500 Series products.

Background

The system will crash due to memory corruption in the “timer” structure used by the FED process. This issue can occur if a switchover is completed or the Stackwise Virtual Link (SVL) flaps.

Problem Symptom

The system will crash unexpectedly due to the FED process.

Workaround/Solution

In order to fix the issue, upgrade the running software release to the fixed release.

Running Software Release Available Fixed Release
Polaris 16.9.1 or earlier Polaris 16.9.2 or later
Polaris 16.6.4 or earlier Polaris 16.6.4a or later
Polaris 16.3.7 or earlier Polaris 16.3.8 or later

 

Customers are encouraged to look on the Software Download page for the latest recommended release (marked with an *) for the respective release trains. You may want to refer to following link for Recommended Release for Catalyst Platform.

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-series-switches/214814-recommended-releases-for-catalyst-9200-9.html

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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