On Thu, Jul 07, 2005 at 06:37:33PM +0100, Martin Beecroft wrote:
> Does this mean you can only monitor a port that does no more than
> 115Mb/s with snmp v1?
32 bit counters (measuring octects), 5 minute poll intervals.

If you are doing 115 Mbps then in 5 minutes you will count
115 * 5 * 60 / 8 = 4312 Bytes
However a 2^32 counter can only count
2^32 / 10^6 = 4295 Bytes

So yes, it will overflow.

On a somewhat related topic Martin, your graph at 
http://www.beecroft.co.uk/choppy.png shows the classic case of this
problem.  I am wondering if I can get permission to use that graphic
in the JFFNMS docs?  You've removed all the identifying information
which is good.  It will probably help others touse a concrete example.
If it can be used, it would go at the bottom of 
http://www.jffnms.org/docs/errors.html which describes this problem.

  - Craig
-- 
Craig Small      GnuPG:1C1B D893 1418 2AF4 45EE  95CB C76C E5AC 12CA DFA5
Eye-Net Consulting http://www.enc.com.au/   MIEE         Debian developer
csmall at : enc.com.au                      ieee.org           debian.org


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