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Refer to the exhibit. A Cisco Catalyst 6500 Series Switch experiences high CPU utilization. What can be the cause of this issue, and how can it be prevented?
Correct Answer: C
Explanation/Reference: Explanation: FIB TCAM Exception - If you try to install more routes than are possible into the FIB TCAM you will see the following error message in the logs: CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched %CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched %CFIB- SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched This error message is received when the amount of available space in the TCAM is exceeded. This results in high CPU. This is a FIB TCAM limitation. Once TCAM is full, a flag will be set and FIB TCAM exception is received. This stops from adding new routes to the TCAM. Therefore, everything will be software switched. The removal of routes does not help resume hardware switching. Once the TCAM enters the exception state, the system must be reloaded to get out of that state. You can view if you have hit a FIB TCAM exception with the following command: 6500-2#sh mls cef exception status Current IPv4 FIB exception state = TRUE Current IPv6 FIB exception state = FALSE Current MPLS FIB exception state = FALSE When the exception state is TRUE, the FIB TCAM has hit an exception. The maximum routes that can be installed in TCAM is increased by the mls cef maximum-routes command. Reference: https://supportforums.cisco.com/document/59926/troubleshooting-high-cpu-6500-sup720