[mrtg] Help with configuring target to used an oid

Mersberger, Robert robert.mersberger at goldenven.com
Fri Feb 9 19:36:56 CET 2007

Try this as it gives a matched pair
Target[tower001.ap101]: at


From: mrtg-bounces at lists.oetiker.ch
[mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Wes Hegge
Sent: Friday, February 09, 2007 12:24 PM
To: mrtg at lists.oetiker.ch
Subject: [mrtg] Help with configuring target to used an oid

Hello everyone, 

Hopefully I have a simple problem.  I am trying to pull the number of
clients from a Motorola Cyclone Access Point.  I have figured out the
OID number to use, it is:  

I can snmpwalk from the machine that mrtg is running on and get the
expected response.  Here it is:
snmpwalk -v 2c -c Canopy
SNMPv2-SMI:: enterprises. = INTEGER: 28

Here is my cfg file for this:
# File: /etc/mrtg/registered_SM_count.cfg
# Configuration file for gathering number of registered SM's on AP's

# Define global options

WorkDir: /var/www/mrtg/
# Refresh brower window very 5 minutes
Refresh: 300
LoadMIBs: /usr/share/snmp/mibs/SNMPv2-MIB.txt,

# Registered SM Monitoring

Target[tower001.ap101]: at
Title[tower001.ap101]: SM Count Tower 001 AP 101
MaxBytes[tower001.ap101]: 200
PageTop[ tower001.ap101]: <H1>SM Count for Tower 001 Access Point</H1>

The error I get is:
2007-02-09 12:20:38: ERROR: Target[tower001.ap101][_IN_]
' . $target->[0]{$mode} ' (warn): Use of
uninitialized value in concatenation (.) or string at (eval 15) line 1.
2007-02-09 12:20:38: ERROR: Target[tower001.ap101][_OUT_]
' $target->[0]{$mode} ' (warn): Use of
uninitialized value in concatenation (.) or string at (eval 16) line 1. 

I notice that the OID number is one digit short, it is missing the last

I am thinking that I may need to use WaLK prepended to the OID.  Just
not sure how to do that.  I cannot find a decent example of its use. 

Any ideas?


Wes Hegge
Network Manager
T6Broadband, Inc.

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