[mrtg] MRTG Max bits per second
Daniel J McDonald
dan.mcdonald at austinenergy.com
Thu Nov 12 15:32:33 CET 2009
On Thu, 2009-11-12 at 13:29 +0000, Lee Todd wrote:
> I have mrtg configured with bit, the graph shows in bits and the max, avg
> and current are all in bits. We have a number of systems with gig links
> and even have a 6gig etherchannel into an ibm blade centre. The max on any
> graph is 120. Is this a limit
It is a limit of snmp version 1. the 32 bit counter rolls over twice in
5 minutes at ~120mb/seconds
> or a know issue and how do I fix it to show
> the real speed?
switch to snmp version 2c or snmp version 3. These versions support 64
bit counters, which rollover about 1 four-millionth less frequently,
making those versions entirely appropriate for speeds up to about a
petabit per second.
snmpv2 can be set very simply. Please read
http://oss.oetiker.ch/mrtg/doc/cfgmaker.en.html for complete
instructions. snmpv3 is a little more challenging to configure, but
provides cryptographic integrity. Once you get templates set up for
snmpv3, the operation is pretty straight-forward.
Daniel J McDonald, CCIE # 2495, CISSP # 78281, CNX
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