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High CPU on Cisco Wireless Services Module (WISM1)




    In this document Cisco TAC engineer " Varun Ajmani" has explained about High CPU issue on Cisco Wireless Services Module

    Problem Subcategory

    Cisco Wireless Services Module (WS-SVC-WISM)



    Problem Type

    Configuration issue

    Software Version

    Wireless LAN with the Cisco WiSM



    Problem Details

    Process are up to 100% CPU usage is up 80-100% with no connection. only one controller is being affected

    Problem Description

    One of the WISM1 controllers (running shows CPU usage as 100%


    Upgraded the controller to, but same results. Debug from 6500 showed that CPU was high on 6500 switch as well, It was because of SNMP.


    PID Runtime(ms)   Invoked  uSecs   5Sec   1Min   5Min  TTY  Process
    398  30028490483930864471  763    61.63% 75.12% 64.93%   0  SNMP ENGINE


    Disabled SNMP on 6500 and WISM1, which helped bring down CPU% on WISM1.

    Both Cisco Wireless Control System (WCS) and Cisco Network Convergence System (NCS) were added on WISM1.

    More Information

    Version history
    Revision #:
    2 of 2
    Last update:
    ‎08-29-2017 06:57 AM
    Updated by:
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