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Understanding Counter Discontinuity

Interface counter discontinuity can occur when a counter wraps or after a line module is reloaded or reset. If one of these actions occurs, applications that utilize the counters in expressions or calculations generate erroneous values and misleading graphs.

Because counters are 64 bits long, the possibility of a counter’s wrapping naturally would occur so infrequently (for example, in many hundreds of years) that this scenario is not recognized as an issue.

Counter discontinuity does occur, however, when you reload or reset a line module. To indicate reloading or resetting, bulk statistics files contain a record similar to the following:



{Controller down slot 3, TUE OCT 29 2004 14:25:10.370 UTC}

This record provides a mechanism by which applications can detect discontinuity events. To take advantage of this detection capability, the bulk statistics parsing entity should use the record to terminate expression or formula calculations for the indicated slot and to establish a new baseline.

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