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CPU Utilization Increases and Remains High After USB Drive Removed Until Switch Is Reset

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TitleCPU Utilization Increases and Remains High After USB Drive Removed Until Switch Is Reset
Symptoms
  • After removing USB drive from switch the CPU utilization increases from 14% to 66% and does not go down until switch is reset
  • Issue occurs on multiple switches
  • Issue occurs with multiple USB drives
  • No configuration required on switch
ERS#show usb-host-port 
USB Host Port Info - Stand-alone Enabled
--------------------------------------------------
    Vendor Info            :         
    Product ID             : USB DISK 2.0    
    Product Revision       : PMAP
    Number of Blocks       : 1966080
    Bytes per Block        : 512
    Total Capacity         : 1006632960

ERS#show cpu-utilization 
----------------------------------------------------------------
                      CPU Utilization
----------------------------------------------------------------

Unit  Last 10 Sec, 1 Min, 10 Min, 60 Min, 24 Hrs, System Boot-Up
----------------------------------------------------------------
1          11%      11%     10%     10%     10%     11%      

/*
REMOVE USB DRIVE
/*
ERS#show usb-host-port 

% There is no USB device inserted in unit.

ERS# show cpu-utilization 
----------------------------------------------------------------
                      CPU Utilization
----------------------------------------------------------------

Unit  Last 10 Sec, 1 Min, 10 Min, 60 Min, 24 Hrs, System Boot-Up
----------------------------------------------------------------
1          55%      21%     11%     10%     10%     11%      

ERS#show cpu-utilization 
----------------------------------------------------------------
                      CPU Utilization
----------------------------------------------------------------

Unit  Last 10 Sec, 1 Min, 10 Min, 60 Min, 24 Hrs, System Boot-Up
----------------------------------------------------------------
1          61%      28%     12%     11%     10%     11%

 
Environment
  • ERS 3600
  • Releases 6.3.2 and earlier
Cause
Software defect ERS3600-843
Resolution
  • Resolved in 6.4.1 release
  • Workaround is reboot of switch
Additional notes

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