[mrtg] Gigabit Interfaces, SNMP v2, and MaxBytes

McDonald, Dan Dan.McDonald at austinenergy.com
Sat Nov 15 01:00:37 CET 2008

On Fri, 2008-11-14 at 15:45 -0800, mrtg at ying.net wrote:
> The problem I immediately ran into was my graphs continued to be drawn
> out of whack.  The scale started reporting speeds in GB/s and I
> suspected perhaps MaxBytes needed an adjustment but haven't read any
> other messages suggesting it should be adjusted beyond the
> 125MBytes/second that cfgmaker uses by default.  

Correct.  MaxBytes is the same irrespective of the counters used.

> I'm also suspecting that perhaps rateup isn't able to handle graphing
> the values calculated based on 64-bit counter values.

I have not seen any bugs in that regard, but I also haven't used rateup
in the past decade (well, maybe in 1999, but I think it was 1998 that I
made the switch and haven't looked back.)

> So, I'm working around the problem by dividing the result I get from
> my target by 100,000, leaving MaxBytes as 125000000, and my graphs
> look a little bit more sane.
> Am I running into the problem solved by using a 64-bit version of
> rateup?

Doubtful.  gigabit interfaces have been around a very long time.

Daniel J McDonald, CCIE #2495, CISSP #78281, CNX
Austin Energy

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