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Performance and Fault Management by James M. Thompson, Kent J. Phelps, Robert L. Pavone, Christopher E. Elliott, Paul L. Della Maggiora

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System-Related Questions

The questions in this section relate to system characteristics of Cisco devices, such as the following:

  • CPU

  • memory

  • buffers

  • environmental

How Do I Collect CPU Utilization?

CPU utilization is a good indicator for determining the health of a network device. The following sections detail how to collect and interpret CPU-related information.

Collecting CPU Utilization on IOS Devices

Critical router functions, such as routing protocol processing and process packet switching, are handled in memory and share the CPU. Thus, if the CPU utilization is very high, it is possible that a routing update cannot be handled or a process-switched packet is dropped.

For routers, collect avgBusy5 from the OLD-CISCO-CPU MIB.

The avgBusy5 variable ...

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