Re: PerfHist-TC-MIB

[Randy Presuhn <[e-mail]>]

Hi - 

> Date: Tue, 2 Jun 1998 23:23:36 -0700 (PDT)
> From: "C. M. Heard/VVNET, Inc." <[e-mail]>
> To: [e-mail], [e-mail]
> Subject: Re: PerfHist-TC-MIB
...
> I don't understand this.  I always thought that if more that 2^32 - 1 of
> the type of events counted by a PerfCurrentCount object occurred within
> a 15 minute interval, then that PerfCurrentCount would be "pegged" at
> 2^32 - 1 (i.e., would not roll over).  Isn't this what a Gauge32 object
> is supposed to do?
...

Nope.  "Pegging" behaviour of Gauges is folklore, due to the
unfortunate use of the word "latch" in RFC 1155.  The current
description in RFC 1902 is explicit (note the last sentence):

|7.1.7.  Gauge32
|
|   The Gauge32 type represents a non-negative integer, which may
|   increase or decrease, but shall never exceed a maximum value.  The
|   maximum value can not be greater than 2^32-1 (4294967295 decimal).
|   The value of a Gauge has its maximum value whenever the information
|   being modeled is greater or equal to that maximum value; if the
|   information being modeled subsequently decreases below the maximum
|   value, the Gauge also decreases.

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