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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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Performance Monitoring for System Interfaces

Performance management of system interfaces really boils down to monitoring bandwidth utilization, which means counting the octets that flow across a given interface and measuring those counts against the bandwidth of the interface. This way, you can determine whether you are overutilizing a particular link and when you need to increase the capacity of a link. In Chapter 4, “Performance Measurement and Reporting,” we discussed the method for calculating link utilization:

  1. Calculating the delta (difference) between two collections of ifInOctets and ifOutOctets each.

  2. Adding the deltas together.

  3. Converting the combined value to bits per seconds (× 8 / (num of seconds in Δ)).

  4. Dividing the bits by ifSpeed (interface ...

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