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Cisco Bug: CSCur00768 - Router stops forwarding traffic after high CPU utilization due interrupt

Last Modified

Sep 14, 2019

Products (1)

  • Cisco 3900 Series Integrated Services Routers

Known Affected Releases

15.2(4)M2

Description (partial)

Symptom:
When the router is under stress due high amount of traffic and showing high CPU utilization, it stops forwarding traffic:

                          9898899999989999989989999998658998555557
      523333332323533333473918956315185451380092012792428195735731
  100                          **  *  * *          **     *       
   90                     **#***#*###*###*#*#####*##*   *##*      
   80                     *##########################*  *##*      
   70                     ###########################*  *##*     *
   60                     ############################* ###** ** *
   50                     ########################################
   40                     ########################################
   30                     ########################################
   20                     ########################################
   10 *           *      *########################################
     0....5....1....1....2....2....3....3....4....4....5....5....6
               0    5    0    5    0    5    0    5    0    5    0
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

Unable to ping neighbor address.

Conditions:
High traffic
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