[mrtg] Re: Problems with SNMP data collection

Daniel J McDonald dan.mcdonald at austinenergy.com
Fri Oct 3 18:13:47 MEST 2003

On Fri, 2003-10-03 at 10:57, Simon Westlake wrote:
> Has anyone ever experienced a problem with MRTG being unable to get SNMP data, although the device is responding to SNMP?

Yes.  There are a number of really wierd bugs out there.  There is one
issue with the request-id used, where if it goes above a certain value
some non-standard clients don't like them.

This is documented, obscurely, in the release notes for the SNMP_Session
module, with this note:

SNMP_Session.pm 0.93: There's a new variable
$default_avoid_negative_request_ids. If it is set to a non-zero value,
newly created SNMP_Session objects will be configured so that only
request IDs in the range 0..231-1 will be used. This is needed to work
around a bug in several SNMP agents. If you sometimes see requests fail,
and the error message always shows a negative request ID when that
happens, please notify the vendor of your agent of the bug. While the
vendor fixes the problem, you can set the variable mentioned above to
work around the bug. The problem has been described in a few mails on
the mrtg-developers mailing list that can hopefully be found
http://www.ee.ethz.ch/~slist/mrtg-developers/msg01609.html in the

Daniel J McDonald, CCIE 2495, CNX
Austin Energy

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