[rrd-users] Re: gigabit interfaces

[Gellatly, Laurie]

All we need to do now is have the manufacturers with Gig interfaces
always provide IfHCInOctets etc and the world will be simple.
In my experience, too many machines have higher speed interfaces
without providing the 64bit counters to support them!

In the words of one of our defunct politicians "Life wasn't meant to be
easy".


			...Laurie :{)

-----Original Message-----
From: Todd Caine [mailto:todd_caine at eli.net]
Sent: Friday, 30 June 2000 8:30
To: Michael Smith
Cc: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Re: gigabit interfaces



Micheal,

I've ran into the same issue with the 32 bit counters as
well.  What I have done to work around this is to query
ifSpeed and check if the interface is over 100Mbps.  If the
interface is under 100Mbps I use ifInOctets
(.1.3.6.1.2.1.2.2.1.10) and ifOutOctets
(.1.3.6.1.2.1.2.2.1.16), otherwise I use ifHCInOctets
(.1.3.6.1.2.1.31.1.1.1.6) and ifHCOutOctets
(.1.3.6.1.2.1.31.1.1.1.10).  You shouldn't have too many
problems with the 64 bit counters wrapping!

Cheers,
Todd

Michael Smith wrote:
> 
> We are relatively new to using rrd and I wanted to get an
> opinion/clarification on a configuration.  We have a generic interface
> configuration that consists of
> 
> <filename>,
> "-b$boot_time",
> "-s300",
> 'DS:InOctets:COUNTER:600:U:U',
> 'DS:OutOctets:COUNTER:600:U:U',
> 'RRA:AVERAGE:0.5:1:105408',
> 'RRA:AVERAGE:0.5:6:700',
> 'RRA:AVERAGE:0.5:24:775',
> 'RRA:AVERAGE:0.5:288:797',
> 'RRA:MAX:0.5:6:700',
> 'RRA:MAX:0.5:24:775',
> 'RRA:MAX:0.5:288:797'
> 
> Here is the delimma.  Some of the interfaces are Gigabit links.  With the
> default step of 300 seconds, these interfaces can wrap more than once.
> Mathmatically speaking, they can wrap once every 34 seconds if fully
> loaded.
> 
> So, if we reduced the step to 30 seconds, im guessing we have to
> increase the number of samples kept by a factor of 10 as well.
> Is that correct?  Has anyone else dealt with this before (high volume
> counters constantly wrapping) and what was your solution?
> 
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