Field Notice: FN - 64191 - Catalyst 3850/3650 Switches That Run Cisco IOS XE Releases 3.6.5E/3.7.4E or Earlier Might Exhibit High CPU Usage - Workaround Provided

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Updated:June 17, 2020
Document ID:FN64191

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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
09-Nov-16
Initial Release
10.0
12-Oct-17
Migration to new field notice system
10.1
22-Jan-19
Correct broken image links
11
03-Sep-19
Initial External Release
11.1
17-Jun-20
Updated the Workaround/Solution Section

Products Affected

Affected OS Type Affected Software Product Affected Release Affected Release Number Comments
NON-IOS
IOSXE
3
3.6.0E, 3.6.0S, 3.6.10E, 3.6.1E, 3.6.1S, 3.6.2aE, 3.6.2E, 3.6.2S, 3.6.3E, 3.6.4E, 3.6.5aE, 3.6.5bE, 3.6.5E, 3.7.0bS, 3.7.0E, 3.7.0S, 3.7.1aS, 3.7.1E, 3.7.1S, 3.7.2E, 3.7.2S, 3.7.2tS, 3.7.3E, 3.7.3S, 3.7.4aS, 3.7.4E, 3.7.4S

Defect Information

Defect ID Headline
CSCuz57493 "High CPU observed in punjectrx fed-ots-main thread
" - Affected SW versions are 3.7.4E or below and 3,6.5E or below

Problem Description

Catalyst C3850 and Catalyst C3650 switches might report unexpected high CPU usage despite any changes made to the configuration or network traffic inbound or outbound to the switch.

Background

One or more cores of the CPU might exhibit high usage due to one of these processes/threads:

  • FED/fed-ots-main
  • FED/Punject Rx
  • FED/XCVR
  • FED/XCVRPoll
  • stack-mgr/Replenish OOB
  • stack-mgr/OOBnd RX

This high CPU condition is typically seen on Catalyst C3850 and Catalyst C3650 switches that have long runtime (several months).

Problem Symptom

The output for these commands will show one or more cores with CPU utilization at 90% or higher consistently.

  • show processes cpu sorted

  • show processes cpu detailed process [process-name] sorted

Workaround/Solution

If the switch shows high CPU usage, take the necessary steps as mentioned in this table.

Running SW Release Observation Workaround/Fix

Release 3.7.4E or earlier

 High CPU due to FED - punject rx/ fed-ots-main or stack-mgr-Replenish OOB/OOBnd RX

Reload the switch in order to restore the switch to a normal CPU level.

When the switch or stack is reloaded, the CPU utilization levels might be brought down temporarily. Consider an upgrade to Cisco IOS® XE Version 3.6.6E or 3.7.5E or later for a permanent fix.


See these documents for guidance:

Release 3.6.5E or earlier

 High CPU due to FED - punject rx/ fed-ots-main or stack-mgr-Replenish OOB/OOBnd RX

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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