[mrtg] Re: 32 bit counters wrapping, trying to use 64 bit counters

[Fruitman, Corey]

A lot of routers support SNMPv2c, but not ifHCIn/OutOctets.  Sometimes only specific interfaces lack large counter support while other interfaces are have it on the same device.  A bit confusing, for sure :)

Some of the routers we have here support SNMPv2c, but only large counters on the ATM interfaces -- not on the Serial interfaces because the bandwidth is too low to have a wrapping problem.  To make matters worse, some devices (IOS-dependent maybe?) return 0 to indicate that they don't support large counters, while other return nulls.

The bottom line is this:  If you can't walk ifHCIn/OutOctets, your device doesn't support it -- so MRTG can't use it to poll.

Hope that helps,
Corey.

-----Original Message-----
From: Edson Manners [mailto:emanners at realprod.acns.fsu.edu]
Sent: October 21, 2003 1:39 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] 32 bit counters wrapping, trying to use 64 bit counters


I think I have some of my 32 bit counters wrapping in the 5 min
intervals. But I read this from the MRTG user pages and have a question.

<snippet>
SNMPv2c

        If you have a fast router you might want to try to poll the
        ifHC* counters.
</snippet>

I manually polled my ifHC* counters;
snmpwalk myrouter comunity ifHCOutOctets

and got back nothing. It seems those OIDs do not contain values. But my
router responds to snmpv2c requests. Will MRTG use 64 bit counters in my
current situation?? 

Thanks.

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