[mrtg] Re: > 120 Mbit/s bandwidths?

[Martin Ansdell-Smith]

On Thu, 20 Jan 2000, TTSG wrote:

> >   MRTG seems to wrap around at somewhere around 110-115 Mbit/s bandwidths
> > on switch and router interfaces et al. Guess some operation or variable
> > wraps over in rateup. Doesn't work for gigabit ethernet or fast ATM links.
> > Has anyone figured this out yet or shall I go through it with gdb myself?
> > How about RRD, where is it limited?
> > 
> 	And I thought it was me.....
> 
> 	I thought it was something I did wrong. Like maybe MaxBytes being
> set or something. I didn't look into it, but its happened to me.
> 
> 		Tuc/TTSG

Isn't this just the limitation on the SNMP INTEGER variable?
It is a 32-bit value so if it is used for octets then it will wrap every
2**32 octets. With a collection period of 5 minutes (300s) then if the
average traffic flow is over 2**32/300 octets per second, the figure will
be understated by (at least one lot of) 2**32/300 octets per second or
about 114Mb/s.

Martin


--
Martin Ansdell-Smith
Network Analyst			http://www.ansdell.demon.co.uk/

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