You should be able to put
SnmpOptions: avoid_negative_request_ids => 1
in your MRTG configuration. In version MRTG 2.10.5 this is the default
setting, judging by the code for cfgcheck() in the file MRTG_lib.pm. I think
that change happened in MRTG 2.9.27. The "SnmpOptions:" configuration option
was added to MRTG 2.9.11.
Support for "avoid_negative_request_ids" was added to SNMP_Session.pm version
0.93, so check the version that came with your copy of MRTG. MRTG 2.10.2 and
newer contain SNMP_Session.pm version 0.98, the current version of
SNMP_Session.pm. You can always pick up the latest version of SNMP_Session.pm,
BER.pm, and SNMP_util.pm from http://www.switch.ch/misc/leinen/snmp/perl/ Just
put all three in the appropriate MRTG directory. That way you won't have to
upgrade MRTG if you don't want to.
Mike Mitchell
-----Original Message-----
From: Peter Glanville [mailto:[EMAIL PROTECTED]
Sent: Friday, October 17, 2003 5:15 AM
To: Butch Kemper; [EMAIL PROTECTED]
Subject: [mrtg] Re: SNMP - No Response Received
> I am monitoring a NetGear FSM726S switch and the Linux box running
> MRTG
is
> connected to one of the ports. The monitor interval is 5 minutes and
about
> 60% of the time, the switch will return the SNMP data but other times
> it does not and MRTG reports a "no response received" error message.
Sometimes
> MRTG will report the error for several consecutive intervals and then
there
> are no error messages for several consecutive intervals.
<snip>
> request ID: -1146335597
Negative request IDs are not supported by certain devices. MRTG uses a random
mix of +ve and -ve, hence the intermittant failure. Edit
mrtg-2.???\lib\mrtg2\snmp_session.pm
change $default_avoid_negative_request_ids to 1
Peter
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