[mrtg] Re: SNMP - No Response Received

[Mike Mitchell]

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:peter_glanville at cuk.canon.co.uk] 
Sent: Friday, October 17, 2003 5:15 AM
To: Butch Kemper; mrtg at list.ee.ethz.ch
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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