[mrtg] SNMP

Martin Macleod-Brown mmacleod at london.edu
Wed Aug 3 17:10:29 MEST 2005

I currently use MRTG to successfully monitor 73 switches/routers on our
network. I am trying to add monitors for 60 Cisco 350 wireless access points
using SNMP to graph the number of connected users. I cant see what Im doing
wrong and was wondering if anyone else had managed to get this working? I
found the following suggested config file on the Somis site....

MaxBytes[$CFGNAME]: $MAX
kMG[$CFGNAME]: ,M,,,
Options[$CFGNAME]: gauge, nopercent, absolute, unknaszero
YLegend[$CFGNAME]: Users Attached
ShortLegend[$CFGNAME]: Users Attached
WithPeak[$CFGNAME]: wmy
Colours[$CFGNAME]: GREEN#00eb0c,BLUE#0000ff,GRAY#AAAAAA,VIOLET#ff00ff
Legend1[$CFGNAME]: Number of Users Attached
Legend2[$CFGNAME]: .
Legend3[$CFGNAME]: Peak Number of Users Attached
Legend4[$CFGNAME]: .
LegendI[$CFGNAME]: Users:
LegendO[$CFGNAME]: .
PageTop[$CFGNAME]: <H1>$DEVICE</H1>

Which I then edited to reflect our network settings

WorkDir: /var/www/html/mrtg/wireless
rkDir: /var/www/html/mrtg/wireless
MaxBytes[SNAP-WAT1-T3]: 10000
kMG[SNAP-WAT1-T3]: ,M,,,
Options[SNAP-WAT1-T3]: gauge, nopercent, absolute, unknaszero
YLegend[SNAP-WAT1-T3]: Users Attached
ShortLegend[SNAP-WAT1-T3]: Users Attached
WithPeak[SNAP-WAT1-T3]: wmy
Colours[SNAP-WAT1-T3]: GREEN#00eb0c,BLUE#0000ff,GRAY#AAAAAA,VIOLET#ff00ff
Legend1[SNAP-WAT1-T3]: Number of Users Attached
Legend2[SNAP-WAT1-T3]: .
Legend3[SNAP-WAT1-T3]: Peak Number of Users Attached
Legend4[SNAP-WAT1-T3]: .
LegendI[SNAP-WAT1-T3]: Users:
LegendO[SNAP-WAT1-T3]: .
Title[SNAP-WAT1-T3]: $SNAP-WAT1-T3
PageTop[SNAP-WAT1-T3]: <H1>SNAP-WAT1-T3</H1>
Directory[SNAP-WAT1-T3]: wat1-t3

Which gives me the following error when I run MRTG, Im stumped, I don't know
where to look, googling has not helped, Im happy to read up, but could do
with a few pointers to point me in the right direction, as I don't
understand the error message, eg '::v4only' - I though SNMP had only 2
versions! If anyone who understands how this works can help I'd be very

SNMP Error: 
Received SNMP response with error code 
  error status: noSuchName 
  index 1 (OID: 
SNMPv1_Session (remote host: "" [].161) 
                  community: "admin" 
                 request ID: 1576016828 
                PDU bufsize: 8000 bytes 
                    timeout: 2s 
                    retries: 5 
                    backoff: 1) 
 at /usr/bin/../lib/mrtg2/SNMP_util.pm line 487 
SNMPGET Problem for sysUptime
sysName on admin at 
 at /usr/bin/mrtg line 1836 
ERROR: Target[][_IN_] ' $target->[0]{$mode} ' did not eval
into defined data 
ERROR: Target[][_OUT_] ' $target->[0]{$mode} ' did not eval
into defined data 

Network Project Engineer,
Information Systems Division
London Business School, Sussex Place, Regents Park, London. NW1 4SA
t: +44 (0)20 7000 7772 direct
+44 (0)20 7262 5050 general
fax: +44 (0)20 7000 7771 direct 
+44 (0)20 7724 7875 general
e: mailto:mmacleod at london.edu      http://www.london.edu/technology/

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