RE: SNMP only getting data every 15 seconds.

> From: Steve (Telsat Pacific) [mailto:[email protected]] 

> 1.3.6.1.2.1.2.2.1.10.1
> 1.3.6.1.2.1.2.2.1.16.1

  OK, ifInOctets and ifOutOctets, thanks.

> Below is the output from snmpwalk.  I ran the command about once per
> second and each time it gave me the same result (it almost looks as if it
> was cached or something) and then around the 15 second mark, it then
> returned a new value.  This completly puzzles me.

  I just tried a similar test on my own project and got bursty results very similar to yours.  This is on a custom built system running an embedded Linux variant which is unlikely to use the same drivers as a prebuilt Fedora system.

  I took a look at RFC 2863 and it describes ifInOctets thusly:

            "The total number of octets received on the interface,

            including framing characters.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."

  All of the ifTable counters have similar descriptions.

  ifCounterDiscontinuityTime description:

            "The value of sysUpTime on the most recent occasion at which
            any one or more of this interface's counters suffered a
            discontinuity.  The relevant counters are the specific
            instances associated with this interface of any Counter32 or

            Counter64 object contained in the ifTable or ifXTable.  If
            no such discontinuities have occurred since the last re-
            initialization of the local management subsystem, then this
            object contains a zero value."

  I retrieved these discontinuities from my system with this command:

snmpwalk -v 2c -c public aaa.bbb.ccc.ddd iso | grep DiscontinuityTime

and found that each of them was zero, theoretically meaning no discontinuities.

  I'm afraid all I can say is "that's the way it works."  I can't speculate about reasons why other systems might act differently.  Perhaps someone more familiar with the net-snmp IF-MIB population code can comment?  There doesn't appear to be any way to change this from the command line or configuration files that I know of.

  Ron



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